From a4b690e8a4e30acb3e0b6e94727c56bc3390409d Mon Sep 17 00:00:00 2001
From: ale <ale@incal.net>
Date: Sun, 18 Nov 2018 17:15:16 +0000
Subject: [PATCH] Upgrade go-common (add tracing)
---
.../ai3/go-common/clientutil/transport.go | 6 +-
.../ai3/go-common/serverutil/http.go | 26 +-
.../ai3/go-common/tracing/tracing.go | 130 +++++
.../github.com/openzipkin/zipkin-go/LICENSE | 201 +++++++
.../github.com/openzipkin/zipkin-go/Makefile | 28 +
.../github.com/openzipkin/zipkin-go/README.md | 79 +++
.../openzipkin/zipkin-go/appveyor.yml | 21 +
.../openzipkin/zipkin-go/circle.yml | 11 +
.../openzipkin/zipkin-go/context.go | 23 +
vendor/github.com/openzipkin/zipkin-go/doc.go | 6 +
.../openzipkin/zipkin-go/endpoint.go | 66 +++
.../zipkin-go/idgenerator/idgenerator.go | 116 ++++
.../openzipkin/zipkin-go/model/annotation.go | 46 ++
.../openzipkin/zipkin-go/model/doc.go | 9 +
.../openzipkin/zipkin-go/model/endpoint.go | 17 +
.../openzipkin/zipkin-go/model/kind.go | 13 +
.../openzipkin/zipkin-go/model/span.go | 124 +++++
.../openzipkin/zipkin-go/model/span_id.go | 30 +
.../openzipkin/zipkin-go/model/traceid.go | 61 +++
.../github.com/openzipkin/zipkin-go/noop.go | 25 +
.../zipkin-go/propagation/propagation.go | 16 +
.../zipkin-go/reporter/http/http.go | 218 ++++++++
.../openzipkin/zipkin-go/reporter/reporter.go | 27 +
.../github.com/openzipkin/zipkin-go/sample.go | 113 ++++
.../github.com/openzipkin/zipkin-go/span.go | 38 ++
.../zipkin-go/span_implementation.go | 78 +++
.../openzipkin/zipkin-go/span_options.go | 74 +++
.../github.com/openzipkin/zipkin-go/tags.go | 23 +
.../github.com/openzipkin/zipkin-go/tracer.go | 173 ++++++
.../openzipkin/zipkin-go/tracer_options.go | 124 +++++
vendor/go.opencensus.io/AUTHORS | 1 +
vendor/go.opencensus.io/CONTRIBUTING.md | 56 ++
vendor/go.opencensus.io/Gopkg.lock | 231 ++++++++
vendor/go.opencensus.io/Gopkg.toml | 36 ++
vendor/go.opencensus.io/LICENSE | 202 +++++++
vendor/go.opencensus.io/README.md | 263 +++++++++
vendor/go.opencensus.io/appveyor.yml | 24 +
vendor/go.opencensus.io/exemplar/exemplar.go | 78 +++
.../exporter/zipkin/zipkin.go | 194 +++++++
vendor/go.opencensus.io/go.mod | 25 +
vendor/go.opencensus.io/go.sum | 48 ++
vendor/go.opencensus.io/internal/internal.go | 37 ++
vendor/go.opencensus.io/internal/sanitize.go | 50 ++
.../internal/tagencoding/tagencoding.go | 72 +++
.../internal/traceinternals.go | 52 ++
vendor/go.opencensus.io/opencensus.go | 21 +
.../go.opencensus.io/plugin/ochttp/client.go | 117 ++++
.../plugin/ochttp/client_stats.go | 135 +++++
vendor/go.opencensus.io/plugin/ochttp/doc.go | 19 +
.../plugin/ochttp/propagation/b3/b3.go | 123 +++++
.../go.opencensus.io/plugin/ochttp/route.go | 51 ++
.../go.opencensus.io/plugin/ochttp/server.go | 440 +++++++++++++++
.../ochttp/span_annotating_client_trace.go | 169 ++++++
.../go.opencensus.io/plugin/ochttp/stats.go | 265 +++++++++
.../go.opencensus.io/plugin/ochttp/trace.go | 228 ++++++++
vendor/go.opencensus.io/stats/doc.go | 69 +++
.../go.opencensus.io/stats/internal/record.go | 25 +
.../stats/internal/validation.go | 28 +
vendor/go.opencensus.io/stats/measure.go | 123 +++++
.../go.opencensus.io/stats/measure_float64.go | 36 ++
.../go.opencensus.io/stats/measure_int64.go | 36 ++
vendor/go.opencensus.io/stats/record.go | 69 +++
vendor/go.opencensus.io/stats/units.go | 25 +
.../stats/view/aggregation.go | 120 ++++
.../stats/view/aggregation_data.go | 235 ++++++++
.../go.opencensus.io/stats/view/collector.go | 87 +++
vendor/go.opencensus.io/stats/view/doc.go | 47 ++
vendor/go.opencensus.io/stats/view/export.go | 58 ++
vendor/go.opencensus.io/stats/view/view.go | 185 +++++++
vendor/go.opencensus.io/stats/view/worker.go | 229 ++++++++
.../stats/view/worker_commands.go | 183 +++++++
vendor/go.opencensus.io/tag/context.go | 67 +++
vendor/go.opencensus.io/tag/doc.go | 26 +
vendor/go.opencensus.io/tag/key.go | 35 ++
vendor/go.opencensus.io/tag/map.go | 197 +++++++
vendor/go.opencensus.io/tag/map_codec.go | 234 ++++++++
vendor/go.opencensus.io/tag/profile_19.go | 31 ++
vendor/go.opencensus.io/tag/profile_not19.go | 23 +
vendor/go.opencensus.io/tag/validate.go | 56 ++
vendor/go.opencensus.io/trace/basetypes.go | 114 ++++
vendor/go.opencensus.io/trace/config.go | 48 ++
vendor/go.opencensus.io/trace/doc.go | 53 ++
vendor/go.opencensus.io/trace/exemplar.go | 43 ++
vendor/go.opencensus.io/trace/export.go | 90 +++
.../trace/internal/internal.go | 21 +
.../trace/propagation/propagation.go | 108 ++++
vendor/go.opencensus.io/trace/sampling.go | 75 +++
vendor/go.opencensus.io/trace/spanbucket.go | 130 +++++
vendor/go.opencensus.io/trace/spanstore.go | 306 +++++++++++
vendor/go.opencensus.io/trace/status_codes.go | 37 ++
vendor/go.opencensus.io/trace/trace.go | 516 ++++++++++++++++++
vendor/go.opencensus.io/trace/trace_go11.go | 32 ++
.../go.opencensus.io/trace/trace_nongo11.go | 25 +
.../trace/tracestate/tracestate.go | 147 +++++
vendor/vendor.json | 148 ++++-
95 files changed, 8963 insertions(+), 13 deletions(-)
create mode 100644 vendor/git.autistici.org/ai3/go-common/tracing/tracing.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/LICENSE
create mode 100644 vendor/github.com/openzipkin/zipkin-go/Makefile
create mode 100644 vendor/github.com/openzipkin/zipkin-go/README.md
create mode 100644 vendor/github.com/openzipkin/zipkin-go/appveyor.yml
create mode 100644 vendor/github.com/openzipkin/zipkin-go/circle.yml
create mode 100644 vendor/github.com/openzipkin/zipkin-go/context.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/doc.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/endpoint.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/idgenerator/idgenerator.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/model/annotation.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/model/doc.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/model/endpoint.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/model/kind.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/model/span.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/model/span_id.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/model/traceid.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/noop.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/propagation/propagation.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/reporter/http/http.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/reporter/reporter.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/sample.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/span.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/span_implementation.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/span_options.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/tags.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/tracer.go
create mode 100644 vendor/github.com/openzipkin/zipkin-go/tracer_options.go
create mode 100644 vendor/go.opencensus.io/AUTHORS
create mode 100644 vendor/go.opencensus.io/CONTRIBUTING.md
create mode 100644 vendor/go.opencensus.io/Gopkg.lock
create mode 100644 vendor/go.opencensus.io/Gopkg.toml
create mode 100644 vendor/go.opencensus.io/LICENSE
create mode 100644 vendor/go.opencensus.io/README.md
create mode 100644 vendor/go.opencensus.io/appveyor.yml
create mode 100644 vendor/go.opencensus.io/exemplar/exemplar.go
create mode 100644 vendor/go.opencensus.io/exporter/zipkin/zipkin.go
create mode 100644 vendor/go.opencensus.io/go.mod
create mode 100644 vendor/go.opencensus.io/go.sum
create mode 100644 vendor/go.opencensus.io/internal/internal.go
create mode 100644 vendor/go.opencensus.io/internal/sanitize.go
create mode 100644 vendor/go.opencensus.io/internal/tagencoding/tagencoding.go
create mode 100644 vendor/go.opencensus.io/internal/traceinternals.go
create mode 100644 vendor/go.opencensus.io/opencensus.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/client.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/client_stats.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/doc.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/route.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/server.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/span_annotating_client_trace.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/stats.go
create mode 100644 vendor/go.opencensus.io/plugin/ochttp/trace.go
create mode 100644 vendor/go.opencensus.io/stats/doc.go
create mode 100644 vendor/go.opencensus.io/stats/internal/record.go
create mode 100644 vendor/go.opencensus.io/stats/internal/validation.go
create mode 100644 vendor/go.opencensus.io/stats/measure.go
create mode 100644 vendor/go.opencensus.io/stats/measure_float64.go
create mode 100644 vendor/go.opencensus.io/stats/measure_int64.go
create mode 100644 vendor/go.opencensus.io/stats/record.go
create mode 100644 vendor/go.opencensus.io/stats/units.go
create mode 100644 vendor/go.opencensus.io/stats/view/aggregation.go
create mode 100644 vendor/go.opencensus.io/stats/view/aggregation_data.go
create mode 100644 vendor/go.opencensus.io/stats/view/collector.go
create mode 100644 vendor/go.opencensus.io/stats/view/doc.go
create mode 100644 vendor/go.opencensus.io/stats/view/export.go
create mode 100644 vendor/go.opencensus.io/stats/view/view.go
create mode 100644 vendor/go.opencensus.io/stats/view/worker.go
create mode 100644 vendor/go.opencensus.io/stats/view/worker_commands.go
create mode 100644 vendor/go.opencensus.io/tag/context.go
create mode 100644 vendor/go.opencensus.io/tag/doc.go
create mode 100644 vendor/go.opencensus.io/tag/key.go
create mode 100644 vendor/go.opencensus.io/tag/map.go
create mode 100644 vendor/go.opencensus.io/tag/map_codec.go
create mode 100644 vendor/go.opencensus.io/tag/profile_19.go
create mode 100644 vendor/go.opencensus.io/tag/profile_not19.go
create mode 100644 vendor/go.opencensus.io/tag/validate.go
create mode 100644 vendor/go.opencensus.io/trace/basetypes.go
create mode 100644 vendor/go.opencensus.io/trace/config.go
create mode 100644 vendor/go.opencensus.io/trace/doc.go
create mode 100644 vendor/go.opencensus.io/trace/exemplar.go
create mode 100644 vendor/go.opencensus.io/trace/export.go
create mode 100644 vendor/go.opencensus.io/trace/internal/internal.go
create mode 100644 vendor/go.opencensus.io/trace/propagation/propagation.go
create mode 100644 vendor/go.opencensus.io/trace/sampling.go
create mode 100644 vendor/go.opencensus.io/trace/spanbucket.go
create mode 100644 vendor/go.opencensus.io/trace/spanstore.go
create mode 100644 vendor/go.opencensus.io/trace/status_codes.go
create mode 100644 vendor/go.opencensus.io/trace/trace.go
create mode 100644 vendor/go.opencensus.io/trace/trace_go11.go
create mode 100644 vendor/go.opencensus.io/trace/trace_nongo11.go
create mode 100644 vendor/go.opencensus.io/trace/tracestate/tracestate.go
diff --git a/vendor/git.autistici.org/ai3/go-common/clientutil/transport.go b/vendor/git.autistici.org/ai3/go-common/clientutil/transport.go
index 843a760..1cc6c6d 100644
--- a/vendor/git.autistici.org/ai3/go-common/clientutil/transport.go
+++ b/vendor/git.autistici.org/ai3/go-common/clientutil/transport.go
@@ -7,6 +7,8 @@ import (
"net/http"
"sync"
"time"
+
+ "git.autistici.org/ai3/go-common/tracing"
)
// The transportCache is just a cache of http transports, each
@@ -29,12 +31,12 @@ func newTransportCache(tlsConfig *tls.Config) *transportCache {
}
func (m *transportCache) newTransport(addr string) http.RoundTripper {
- return &http.Transport{
+ return tracing.WrapTransport(&http.Transport{
TLSClientConfig: m.tlsConfig,
DialContext: func(ctx context.Context, network, _ string) (net.Conn, error) {
return netDialContext(ctx, network, addr)
},
- }
+ })
}
func (m *transportCache) getTransport(addr string) http.RoundTripper {
diff --git a/vendor/git.autistici.org/ai3/go-common/serverutil/http.go b/vendor/git.autistici.org/ai3/go-common/serverutil/http.go
index 09cc9bb..604ca98 100644
--- a/vendor/git.autistici.org/ai3/go-common/serverutil/http.go
+++ b/vendor/git.autistici.org/ai3/go-common/serverutil/http.go
@@ -3,16 +3,18 @@ package serverutil
import (
"context"
"crypto/tls"
+ "fmt"
"io"
"log"
"net"
"net/http"
- "net/http/pprof"
+ _ "net/http/pprof"
"os"
"os/signal"
"syscall"
"time"
+ "git.autistici.org/ai3/go-common/tracing"
"github.com/coreos/go-systemd/daemon"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -77,6 +79,10 @@ func (config *ServerConfig) buildHTTPServer(h http.Handler) (*http.Server, error
// the listener, otherwise it will handle graceful termination on
// SIGINT or SIGTERM and return nil.
func Serve(h http.Handler, config *ServerConfig, addr string) error {
+ // Wrap with tracing handler (exclude metrics and other
+ // debugging endpoints).
+ h = tracing.WrapHandler(h, guessEndpointName(addr))
+
// Create the HTTP server.
srv, err := config.buildHTTPServer(h)
if err != nil {
@@ -139,8 +145,10 @@ func defaultHandler(h http.Handler) http.Handler {
// Add an endpoint to serve Prometheus metrics.
root.Handle("/metrics", promhttp.Handler())
- // Add the net/http/pprof debug handlers.
- root.Handle("/debug/pprof/", pprof.Handler(""))
+ // Let the default net/http handler deal with /debug/
+ // URLs. Packages such as net/http/pprof register their
+ // handlers there in ways that aren't reproducible.
+ root.Handle("/debug/", http.DefaultServeMux)
// Forward everything else to the main handler, adding
// Prometheus instrumentation (requests to /metrics and
@@ -151,6 +159,18 @@ func defaultHandler(h http.Handler) http.Handler {
return root
}
+func guessEndpointName(addr string) string {
+ _, port, err := net.SplitHostPort(addr)
+ if err != nil {
+ return addr
+ }
+ host, err := os.Hostname()
+ if err != nil {
+ return addr
+ }
+ return fmt.Sprintf("%s:%s", host, port)
+}
+
// HTTP-related metrics.
var (
// Since we instrument the root HTTP handler, we don't really
diff --git a/vendor/git.autistici.org/ai3/go-common/tracing/tracing.go b/vendor/git.autistici.org/ai3/go-common/tracing/tracing.go
new file mode 100644
index 0000000..df6144b
--- /dev/null
+++ b/vendor/git.autistici.org/ai3/go-common/tracing/tracing.go
@@ -0,0 +1,130 @@
+package tracing
+
+import (
+ "encoding/json"
+ "errors"
+ "io/ioutil"
+ "log"
+ "net/http"
+ "os"
+ "path/filepath"
+ "sync"
+
+ openzipkin "github.com/openzipkin/zipkin-go"
+ zipkinHTTP "github.com/openzipkin/zipkin-go/reporter/http"
+ "go.opencensus.io/exporter/zipkin"
+ "go.opencensus.io/plugin/ochttp"
+ "go.opencensus.io/trace"
+)
+
+var (
+ // Enabled reports whether tracing is globally enabled or not.
+ Enabled bool
+
+ // The active tracing configuration, if Enabled is true.
+ config tracingConfig
+
+ initOnce sync.Once
+)
+
+const globalTracingConfigPath = "/etc/tracing/client.conf"
+
+type tracingConfig struct {
+ ReportURL string `json:"report_url"`
+}
+
+// Read the global tracing configuration file. Its location is
+// hardcoded, but it can be overriden using the TRACING_CONFIG
+// environment variable.
+func readTracingConfig() error {
+ // Read and decode configuration.
+ cfgPath := globalTracingConfigPath
+ if s := os.Getenv("TRACING_CONFIG"); s != "" {
+ cfgPath = s
+ }
+ data, err := ioutil.ReadFile(cfgPath)
+ if err != nil {
+ return err
+ }
+
+ if err := json.Unmarshal(data, &config); err != nil {
+ log.Printf("warning: error in tracing configuration: %v, tracing disabled", err)
+ return err
+ }
+
+ if config.ReportURL == "" {
+ log.Printf("warning: tracing configuration contains no report_url, tracing disabled")
+ return errors.New("no report_url")
+ }
+
+ return nil
+}
+
+// Compute the service name for Zipkin: this is usually the program
+// name (without path), but it can be overriden by the TRACING_SERVICE
+// environment variable.
+func getServiceName() string {
+ if s := os.Getenv("TRACING_SERVICE"); s != "" {
+ return s
+ }
+ return filepath.Base(os.Args[0])
+}
+
+// Initialize tracing. Tracing will be enabled if the system-wide
+// tracing configuration file is present and valid. Explicitly set
+// TRACING_ENABLE=0 in the environment to disable tracing.
+//
+// We need to check the configuration as soon as possible, because
+// it's likely that client transports are created before HTTP servers,
+// and we need to wrap them with opencensus at creation time.
+func init() {
+ // Kill switch from environment.
+ if s := os.Getenv("TRACING_ENABLE"); s == "0" {
+ return
+ }
+
+ if err := readTracingConfig(); err != nil {
+ return
+ }
+
+ Enabled = true
+}
+
+func initTracing(endpointAddr string) {
+ initOnce.Do(func() {
+ localEndpoint, err := openzipkin.NewEndpoint(getServiceName(), endpointAddr)
+ if err != nil {
+ log.Printf("warning: error creating tracing endpoint: %v, tracing disabled", err)
+ return
+ }
+
+ reporter := zipkinHTTP.NewReporter(config.ReportURL)
+ ze := zipkin.NewExporter(reporter, localEndpoint)
+
+ trace.RegisterExporter(ze)
+ trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
+
+ log.Printf("tracing enabled (report_url %s)", config.ReportURL)
+
+ Enabled = true
+ })
+}
+
+// WrapTransport optionally wraps a http.RoundTripper with OpenCensus
+// tracing functionality, if it is globally enabled.
+func WrapTransport(t http.RoundTripper) http.RoundTripper {
+ if Enabled {
+ t = &ochttp.Transport{Base: t}
+ }
+ return t
+}
+
+// WrapHandler wraps a http.Handler with OpenCensus tracing
+// functionality, if globally enabled.
+func WrapHandler(h http.Handler, endpointAddr string) http.Handler {
+ if Enabled {
+ initTracing(endpointAddr)
+ h = &ochttp.Handler{Handler: h}
+ }
+ return h
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/LICENSE b/vendor/github.com/openzipkin/zipkin-go/LICENSE
new file mode 100644
index 0000000..2ff7224
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/LICENSE
@@ -0,0 +1,201 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction,
+and distribution as defined by Sections 1 through 9 of this document.
+
+"Licensor" shall mean the copyright owner or entity authorized by
+the copyright owner that is granting the License.
+
+"Legal Entity" shall mean the union of the acting entity and all
+other entities that control, are controlled by, or are under common
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+direction or management of such entity, whether by contract or
+otherwise, or (ii) ownership of fifty percent (50%) or more of the
+outstanding shares, or (iii) beneficial ownership of such entity.
+
+"You" (or "Your") shall mean an individual or Legal Entity
+exercising permissions granted by this License.
+
+"Source" form shall mean the preferred form for making modifications,
+including but not limited to software source code, documentation
+source, and configuration files.
+
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+
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+(an example is provided in the Appendix below).
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+"Derivative Works" shall mean any work, whether in Source or Object
+form, that is based on (or derived from) the Work and for which the
+editorial revisions, annotations, elaborations, or other modifications
+represent, as a whole, an original work of authorship. For the purposes
+of this License, Derivative Works shall not include works that remain
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+
+"Contribution" shall mean any work of authorship, including
+the original version of the Work and any modifications or additions
+to that Work or Derivative Works thereof, that is intentionally
+submitted to Licensor for inclusion in the Work by the copyright owner
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+excluding communication that is conspicuously marked or otherwise
+designated in writing by the copyright owner as "Not a Contribution."
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+"Contributor" shall mean Licensor and any individual or Legal Entity
+on behalf of whom a Contribution has been received by Licensor and
+subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+this License, each Contributor hereby grants to You a perpetual,
+worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+copyright license to reproduce, prepare Derivative Works of,
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+(except as stated in this section) patent license to make, have made,
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+cross-claim or counterclaim in a lawsuit) alleging that the Work
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+or contributory patent infringement, then any patent licenses
+granted to You under this License for that Work shall terminate
+as of the date such litigation is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the
+Work or Derivative Works thereof in any medium, with or without
+modifications, and in Source or Object form, provided that You
+meet the following conditions:
+
+(a) You must give any other recipients of the Work or
+Derivative Works a copy of this License; and
+
+(b) You must cause any modified files to carry prominent notices
+stating that You changed the files; and
+
+(c) You must retain, in the Source form of any Derivative Works
+that You distribute, all copyright, patent, trademark, and
+attribution notices from the Source form of the Work,
+excluding those notices that do not pertain to any part of
+the Derivative Works; and
+
+(d) If the Work includes a "NOTICE" text file as part of its
+distribution, then any Derivative Works that You distribute must
+include a readable copy of the attribution notices contained
+within such NOTICE file, excluding those notices that do not
+pertain to any part of the Derivative Works, in at least one
+of the following places: within a NOTICE text file distributed
+as part of the Derivative Works; within the Source form or
+documentation, if provided along with the Derivative Works; or,
+within a display generated by the Derivative Works, if and
+wherever such third-party notices normally appear. The contents
+of the NOTICE file are for informational purposes only and
+do not modify the License. You may add Your own attribution
+notices within Derivative Works that You distribute, alongside
+or as an addendum to the NOTICE text from the Work, provided
+that such additional attribution notices cannot be construed
+as modifying the License.
+
+You may add Your own copyright statement to Your modifications and
+may provide additional or different license terms and conditions
+for use, reproduction, or distribution of Your modifications, or
+for any such Derivative Works as a whole, provided Your use,
+reproduction, and distribution of the Work otherwise complies with
+the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+any Contribution intentionally submitted for inclusion in the Work
+by You to the Licensor shall be under the terms and conditions of
+this License, without any additional terms or conditions.
+Notwithstanding the above, nothing herein shall supersede or modify
+the terms of any separate license agreement you may have executed
+with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+names, trademarks, service marks, or product names of the Licensor,
+except as required for reasonable and customary use in describing the
+origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+agreed to in writing, Licensor provides the Work (and each
+Contributor provides its Contributions) on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+implied, including, without limitation, any warranties or conditions
+of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+PARTICULAR PURPOSE. You are solely responsible for determining the
+appropriateness of using or redistributing the Work and assume any
+risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+whether in tort (including negligence), contract, or otherwise,
+unless required by applicable law (such as deliberate and grossly
+negligent acts) or agreed to in writing, shall any Contributor be
+liable to You for damages, including any direct, indirect, special,
+incidental, or consequential damages of any character arising as a
+result of this License or out of the use or inability to use the
+Work (including but not limited to damages for loss of goodwill,
+work stoppage, computer failure or malfunction, or any and all
+other commercial damages or losses), even if such Contributor
+has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+the Work or Derivative Works thereof, You may choose to offer,
+and charge a fee for, acceptance of support, warranty, indemnity,
+or other liability obligations and/or rights consistent with this
+License. However, in accepting such obligations, You may act only
+on Your own behalf and on Your sole responsibility, not on behalf
+of any other Contributor, and only if You agree to indemnify,
+defend, and hold each Contributor harmless for any liability
+incurred by, or claims asserted against, such Contributor by reason
+of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+To apply the Apache License to your work, attach the following
+boilerplate notice, with the fields enclosed by brackets "{}"
+replaced with your own identifying information. (Don't include
+the brackets!) The text should be enclosed in the appropriate
+comment syntax for the file format. We also recommend that a
+file or class name and description of purpose be included on the
+same "printed page" as the copyright notice for easier
+identification within third-party archives.
+
+Copyright 2017 The OpenZipkin Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
diff --git a/vendor/github.com/openzipkin/zipkin-go/Makefile b/vendor/github.com/openzipkin/zipkin-go/Makefile
new file mode 100644
index 0000000..bfee671
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/Makefile
@@ -0,0 +1,28 @@
+
+.DEFAULT_GOAL := test
+
+.PHONY: test
+test:
+ go test -v -race -cover ./...
+
+.PHONY: bench
+bench:
+ go test -v -run - -bench . -benchmem ./...
+
+.PHONY: protoc
+protoc:
+ protoc --go_out=. proto/v2/zipkin.proto
+
+.PHONY: lint
+lint:
+ # Ignore grep's exit code since no match returns 1.
+ -if [[ ! $TRAVIS_GO_VERSION = 1.8* ]]; then echo 'linting...' ; golint ./... ; fi
+
+.PHONY: vet
+vet:
+ go vet ./...
+
+.PHONY: all
+all: vet lint test bench
+
+.PHONY: example
diff --git a/vendor/github.com/openzipkin/zipkin-go/README.md b/vendor/github.com/openzipkin/zipkin-go/README.md
new file mode 100644
index 0000000..8ebf387
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/README.md
@@ -0,0 +1,79 @@
+# Zipkin Library for Go
+
+[](https://travis-ci.org/openzipkin/zipkin-go)
+[](https://circleci.com/gh/openzipkin/zipkin-go)
+[](https://ci.appveyor.com/project/basvanbeek/zipkin-go)
+[](https://coveralls.io/github/openzipkin/zipkin-go?branch=master)
+[](https://goreportcard.com/report/github.com/openzipkin/zipkin-go)
+[](https://godoc.org/github.com/openzipkin/zipkin-go)
+[](https://gitter.im/openzipkin/zipkin?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[](https://sourcegraph.com/github.com/openzipkin/zipkin-go?badge)
+
+Zipkin Go is the official Go Tracer implementation for Zipkin, supported by the
+OpenZipkin community.
+
+## package organization
+`zipkin-go` is built with interoperability in mind within the OpenZipkin
+community and even 3rd parties, the library consists of several packages.
+
+The main tracing implementation can be found in the root folder of this
+repository. Reusable parts not considered core implementation or deemed
+beneficiary for usage by others are placed in their own packages within this
+repository.
+
+### model
+This library implements the Zipkin V2 Span Model which is available in the model
+package. It contains a Go data model compatible with the Zipkin V2 API and can
+automatically sanitize, parse and (de)serialize to and from the required JSON
+representation as used by the official Zipkin V2 Collectors.
+
+### propagation
+The propagation package and B3 subpackage hold the logic for propagating
+SpanContext (span identifiers and sampling flags) between services participating
+in traces. Currently Zipkin B3 Propagation is supported for HTTP and GRPC.
+
+### middleware
+The middleware subpackages contain officially supported middleware handlers and
+tracing wrappers.
+
+#### http
+An easy to use http.Handler middleware for tracing server side requests is
+provided. This allows one to use this middleware in applications using
+standard library servers as well as most available higher level frameworks. Some
+frameworks will have their own instrumentation and middleware that maps better
+for their ecosystem.
+
+For HTTP client operations `NewTransport` can return a `http.RoundTripper`
+implementation that can either wrap the standard http.Client's Transport or a
+custom provided one and add per request tracing. Since HTTP Requests can have
+one or multiple redirects it is advisable to always enclose HTTP Client calls
+with a `Span` either around the `*http.Client` call level or parent function
+level.
+
+For convenience `NewClient` is provided which returns a HTTP Client which embeds
+`*http.Client` and provides an `application span` around the HTTP calls when
+calling the `DoWithAppSpan()` method.
+
+#### grpc
+gRPC middleware / interceptors are planned for the near future.
+
+### reporter
+The reporter package holds the interface which the various Reporter
+implementations use. It is exported into its own package as it can be used by
+3rd parties to use these Reporter packages in their own libraries for exporting
+to the Zipkin ecosystem. The `zipkin-go` tracer also uses the interface to
+accept 3rd party Reporter implementations.
+
+#### HTTP Reporter
+Most common Reporter type used by Zipkin users transporting Spans to the Zipkin
+server using JSON over HTTP. The reporter holds a buffer and reports to the
+backend asynchronously.
+
+#### Kafka Reporter
+High performance Reporter transporting Spans to the Zipkin server using a Kafka
+Producer digesting JSON V2 Spans. The reporter uses the
+[Sarama async producer](https://godoc.org/github.com/Shopify/sarama#AsyncProducer)
+underneath.
+
+## usage and examples
+[HTTP Server Example](example_httpserver_test.go)
diff --git a/vendor/github.com/openzipkin/zipkin-go/appveyor.yml b/vendor/github.com/openzipkin/zipkin-go/appveyor.yml
new file mode 100644
index 0000000..cb2baf3
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/appveyor.yml
@@ -0,0 +1,21 @@
+version: v1.0.0.{build}
+
+platform: x64
+
+clone_folder: c:\gopath\src\github.com\openzipkin\zipkin-go
+
+environment:
+ GOPATH: c:\gopath
+
+install:
+ - echo %PATH%
+ - echo %GOPATH%
+ - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+ - go version
+ - go env
+
+build_script:
+ - go get -t -v ./...
+ - go vet ./...
+ - go test -v -race -cover ./...
+ - go test -v -run - -bench . -benchmem ./...
diff --git a/vendor/github.com/openzipkin/zipkin-go/circle.yml b/vendor/github.com/openzipkin/zipkin-go/circle.yml
new file mode 100644
index 0000000..808b54c
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/circle.yml
@@ -0,0 +1,11 @@
+version: 2
+jobs:
+ build:
+ working_directory: /go/src/github.com/openzipkin/zipkin-go
+ parallelism: 1
+ docker:
+ - image: circleci/golang
+ steps:
+ - checkout
+ - run: go get -t -v -d ./...
+ - run: make vet test bench
diff --git a/vendor/github.com/openzipkin/zipkin-go/context.go b/vendor/github.com/openzipkin/zipkin-go/context.go
new file mode 100644
index 0000000..171db90
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/context.go
@@ -0,0 +1,23 @@
+package zipkin
+
+import (
+ "context"
+)
+
+// SpanFromContext retrieves a Zipkin Span from Go's context propagation
+// mechanism if found. If not found, returns nil.
+func SpanFromContext(ctx context.Context) Span {
+ if s, ok := ctx.Value(spanKey).(Span); ok {
+ return s
+ }
+ return nil
+}
+
+// NewContext stores a Zipkin Span into Go's context propagation mechanism.
+func NewContext(ctx context.Context, s Span) context.Context {
+ return context.WithValue(ctx, spanKey, s)
+}
+
+type ctxKey struct{}
+
+var spanKey = ctxKey{}
diff --git a/vendor/github.com/openzipkin/zipkin-go/doc.go b/vendor/github.com/openzipkin/zipkin-go/doc.go
new file mode 100644
index 0000000..a49deba
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/doc.go
@@ -0,0 +1,6 @@
+/*
+Package zipkin implements a native Zipkin instrumentation library for Go.
+
+See https://zipkin.io for more information about Zipkin.
+*/
+package zipkin
diff --git a/vendor/github.com/openzipkin/zipkin-go/endpoint.go b/vendor/github.com/openzipkin/zipkin-go/endpoint.go
new file mode 100644
index 0000000..530091f
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/endpoint.go
@@ -0,0 +1,66 @@
+package zipkin
+
+import (
+ "net"
+ "strconv"
+ "strings"
+
+ "github.com/openzipkin/zipkin-go/model"
+)
+
+// NewEndpoint creates a new endpoint given the provided serviceName and
+// hostPort.
+func NewEndpoint(serviceName string, hostPort string) (*model.Endpoint, error) {
+ e := &model.Endpoint{
+ ServiceName: serviceName,
+ }
+
+ if hostPort == "" || hostPort == ":0" {
+ if serviceName == "" {
+ // if all properties are empty we should not have an Endpoint object.
+ return nil, nil
+ }
+ return e, nil
+ }
+
+ if strings.IndexByte(hostPort, ':') < 0 {
+ hostPort += ":0"
+ }
+
+ host, port, err := net.SplitHostPort(hostPort)
+ if err != nil {
+ return nil, err
+ }
+
+ p, err := strconv.ParseUint(port, 10, 16)
+ if err != nil {
+ return nil, err
+ }
+ e.Port = uint16(p)
+
+ addrs, err := net.LookupIP(host)
+ if err != nil {
+ return nil, err
+ }
+
+ for i := range addrs {
+ addr := addrs[i].To4()
+ if addr == nil {
+ // IPv6 - 16 bytes
+ if e.IPv6 == nil {
+ e.IPv6 = addrs[i].To16()
+ }
+ } else {
+ // IPv4 - 4 bytes
+ if e.IPv4 == nil {
+ e.IPv4 = addr
+ }
+ }
+ if e.IPv4 != nil && e.IPv6 != nil {
+ // Both IPv4 & IPv6 have been set, done...
+ break
+ }
+ }
+
+ return e, nil
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/idgenerator/idgenerator.go b/vendor/github.com/openzipkin/zipkin-go/idgenerator/idgenerator.go
new file mode 100644
index 0000000..a9de100
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/idgenerator/idgenerator.go
@@ -0,0 +1,116 @@
+/*
+Package idgenerator contains several Span and Trace ID generators which can be
+used by the Zipkin tracer. Additional third party generators can be plugged in
+if they adhere to the IDGenerator interface.
+*/
+package idgenerator
+
+import (
+ "math/rand"
+ "sync"
+ "time"
+
+ "github.com/openzipkin/zipkin-go/model"
+)
+
+var (
+ seededIDGen = rand.New(rand.NewSource(time.Now().UnixNano()))
+ // NewSource returns a new pseudo-random Source seeded with the given value.
+ // Unlike the default Source used by top-level functions, this source is not
+ // safe for concurrent use by multiple goroutines. Hence the need for a mutex.
+ seededIDLock sync.Mutex
+)
+
+// IDGenerator interface can be used to provide the Zipkin Tracer with custom
+// implementations to generate Span and Trace IDs.
+type IDGenerator interface {
+ SpanID(traceID model.TraceID) model.ID // Generates a new Span ID
+ TraceID() model.TraceID // Generates a new Trace ID
+}
+
+// NewRandom64 returns an ID Generator which can generate 64 bit trace and span
+// id's
+func NewRandom64() IDGenerator {
+ return &randomID64{}
+}
+
+// NewRandom128 returns an ID Generator which can generate 128 bit trace and 64
+// bit span id's
+func NewRandom128() IDGenerator {
+ return &randomID128{}
+}
+
+// NewRandomTimestamped generates 128 bit time sortable traceid's and 64 bit
+// spanid's.
+func NewRandomTimestamped() IDGenerator {
+ return &randomTimestamped{}
+}
+
+// randomID64 can generate 64 bit traceid's and 64 bit spanid's.
+type randomID64 struct{}
+
+func (r *randomID64) TraceID() (id model.TraceID) {
+ seededIDLock.Lock()
+ id = model.TraceID{
+ Low: uint64(seededIDGen.Int63()),
+ }
+ seededIDLock.Unlock()
+ return
+}
+
+func (r *randomID64) SpanID(traceID model.TraceID) (id model.ID) {
+ if !traceID.Empty() {
+ return model.ID(traceID.Low)
+ }
+ seededIDLock.Lock()
+ id = model.ID(seededIDGen.Int63())
+ seededIDLock.Unlock()
+ return
+}
+
+// randomID128 can generate 128 bit traceid's and 64 bit spanid's.
+type randomID128 struct{}
+
+func (r *randomID128) TraceID() (id model.TraceID) {
+ seededIDLock.Lock()
+ id = model.TraceID{
+ High: uint64(seededIDGen.Int63()),
+ Low: uint64(seededIDGen.Int63()),
+ }
+ seededIDLock.Unlock()
+ return
+}
+
+func (r *randomID128) SpanID(traceID model.TraceID) (id model.ID) {
+ if !traceID.Empty() {
+ return model.ID(traceID.Low)
+ }
+ seededIDLock.Lock()
+ id = model.ID(seededIDGen.Int63())
+ seededIDLock.Unlock()
+ return
+}
+
+// randomTimestamped can generate 128 bit time sortable traceid's compatible
+// with AWS X-Ray and 64 bit spanid's.
+type randomTimestamped struct{}
+
+func (t *randomTimestamped) TraceID() (id model.TraceID) {
+ seededIDLock.Lock()
+ id = model.TraceID{
+ High: uint64(time.Now().Unix()<<32) + uint64(seededIDGen.Int31()),
+ Low: uint64(seededIDGen.Int63()),
+ }
+ seededIDLock.Unlock()
+ return
+}
+
+func (t *randomTimestamped) SpanID(traceID model.TraceID) (id model.ID) {
+ if !traceID.Empty() {
+ return model.ID(traceID.Low)
+ }
+ seededIDLock.Lock()
+ id = model.ID(seededIDGen.Int63())
+ seededIDLock.Unlock()
+ return
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/model/annotation.go b/vendor/github.com/openzipkin/zipkin-go/model/annotation.go
new file mode 100644
index 0000000..751f81f
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/model/annotation.go
@@ -0,0 +1,46 @@
+package model
+
+import (
+ "encoding/json"
+ "errors"
+ "time"
+)
+
+// ErrValidTimestampRequired error
+var ErrValidTimestampRequired = errors.New("valid annotation timestamp required")
+
+// Annotation associates an event that explains latency with a timestamp.
+type Annotation struct {
+ Timestamp time.Time
+ Value string
+}
+
+// MarshalJSON implements custom JSON encoding
+func (a *Annotation) MarshalJSON() ([]byte, error) {
+ return json.Marshal(&struct {
+ Timestamp int64 `json:"timestamp"`
+ Value string `json:"value"`
+ }{
+ Timestamp: a.Timestamp.Round(time.Microsecond).UnixNano() / 1e3,
+ Value: a.Value,
+ })
+}
+
+// UnmarshalJSON implements custom JSON decoding
+func (a *Annotation) UnmarshalJSON(b []byte) error {
+ type Alias Annotation
+ annotation := &struct {
+ TimeStamp uint64 `json:"timestamp"`
+ *Alias
+ }{
+ Alias: (*Alias)(a),
+ }
+ if err := json.Unmarshal(b, &annotation); err != nil {
+ return err
+ }
+ if annotation.TimeStamp < 1 {
+ return ErrValidTimestampRequired
+ }
+ a.Timestamp = time.Unix(0, int64(annotation.TimeStamp)*1e3)
+ return nil
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/model/doc.go b/vendor/github.com/openzipkin/zipkin-go/model/doc.go
new file mode 100644
index 0000000..99c2ec3
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/model/doc.go
@@ -0,0 +1,9 @@
+/*
+Package model contains the Zipkin V2 model which is used by the Zipkin Go
+tracer implementation.
+
+Third party instrumentation libraries can use the model and transport packages
+found in this Zipkin Go library to directly interface with the Zipkin Server or
+Zipkin Collectors without the need to use the tracer implementation itself.
+*/
+package model
diff --git a/vendor/github.com/openzipkin/zipkin-go/model/endpoint.go b/vendor/github.com/openzipkin/zipkin-go/model/endpoint.go
new file mode 100644
index 0000000..9a2aa0c
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/model/endpoint.go
@@ -0,0 +1,17 @@
+package model
+
+import "net"
+
+// Endpoint holds the network context of a node in the service graph.
+type Endpoint struct {
+ ServiceName string `json:"serviceName,omitempty"`
+ IPv4 net.IP `json:"ipv4,omitempty"`
+ IPv6 net.IP `json:"ipv6,omitempty"`
+ Port uint16 `json:"port,omitempty"`
+}
+
+// Empty returns if all Endpoint properties are empty / unspecified.
+func (e *Endpoint) Empty() bool {
+ return e == nil ||
+ (e.ServiceName == "" && e.Port == 0 && len(e.IPv4) == 0 && len(e.IPv6) == 0)
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/model/kind.go b/vendor/github.com/openzipkin/zipkin-go/model/kind.go
new file mode 100644
index 0000000..8da3c9b
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/model/kind.go
@@ -0,0 +1,13 @@
+package model
+
+// Kind clarifies context of timestamp, duration and remoteEndpoint in a span.
+type Kind string
+
+// Available Kind values
+const (
+ Undetermined Kind = ""
+ Client Kind = "CLIENT"
+ Server Kind = "SERVER"
+ Producer Kind = "PRODUCER"
+ Consumer Kind = "CONSUMER"
+)
diff --git a/vendor/github.com/openzipkin/zipkin-go/model/span.go b/vendor/github.com/openzipkin/zipkin-go/model/span.go
new file mode 100644
index 0000000..fbdb7c7
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/model/span.go
@@ -0,0 +1,124 @@
+package model
+
+import (
+ "encoding/json"
+ "errors"
+ "time"
+)
+
+// unmarshal errors
+var (
+ ErrValidTraceIDRequired = errors.New("valid traceId required")
+ ErrValidIDRequired = errors.New("valid span id required")
+ ErrValidDurationRequired = errors.New("valid duration required")
+)
+
+// SpanContext holds the context of a Span.
+type SpanContext struct {
+ TraceID TraceID `json:"traceId"`
+ ID ID `json:"id"`
+ ParentID *ID `json:"parentId,omitempty"`
+ Debug bool `json:"debug,omitempty"`
+ Sampled *bool `json:"-"`
+ Err error `json:"-"`
+}
+
+// SpanModel structure.
+//
+// If using this library to instrument your application you will not need to
+// directly access or modify this representation. The SpanModel is exported for
+// use cases involving 3rd party Go instrumentation libraries desiring to
+// export data to a Zipkin server using the Zipkin V2 Span model.
+type SpanModel struct {
+ SpanContext
+ Name string `json:"name,omitempty"`
+ Kind Kind `json:"kind,omitempty"`
+ Timestamp time.Time `json:"-"`
+ Duration time.Duration `json:"-"`
+ Shared bool `json:"shared,omitempty"`
+ LocalEndpoint *Endpoint `json:"localEndpoint,omitempty"`
+ RemoteEndpoint *Endpoint `json:"remoteEndpoint,omitempty"`
+ Annotations []Annotation `json:"annotations,omitempty"`
+ Tags map[string]string `json:"tags,omitempty"`
+}
+
+// MarshalJSON exports our Model into the correct format for the Zipkin V2 API.
+func (s SpanModel) MarshalJSON() ([]byte, error) {
+ type Alias SpanModel
+
+ var timestamp int64
+ if !s.Timestamp.IsZero() {
+ if s.Timestamp.Unix() < 1 {
+ // Zipkin does not allow Timestamps before Unix epoch
+ return nil, ErrValidTimestampRequired
+ }
+ timestamp = s.Timestamp.Round(time.Microsecond).UnixNano() / 1e3
+ }
+
+ if s.Duration < time.Microsecond {
+ if s.Duration < 0 {
+ // negative duration is not allowed and signals a timing logic error
+ return nil, ErrValidDurationRequired
+ } else if s.Duration > 0 {
+ // sub microsecond durations are reported as 1 microsecond
+ s.Duration = 1 * time.Microsecond
+ }
+ } else {
+ // Duration will be rounded to nearest microsecond representation.
+ //
+ // NOTE: Duration.Round() is not available in Go 1.8 which we still support.
+ // To handle microsecond resolution rounding we'll add 500 nanoseconds to
+ // the duration. When truncated to microseconds in the call to marshal, it
+ // will be naturally rounded. See TestSpanDurationRounding in span_test.go
+ s.Duration += 500 * time.Nanosecond
+ }
+
+ if s.LocalEndpoint.Empty() {
+ s.LocalEndpoint = nil
+ }
+
+ if s.RemoteEndpoint.Empty() {
+ s.RemoteEndpoint = nil
+ }
+
+ return json.Marshal(&struct {
+ T int64 `json:"timestamp,omitempty"`
+ D int64 `json:"duration,omitempty"`
+ Alias
+ }{
+ T: timestamp,
+ D: s.Duration.Nanoseconds() / 1e3,
+ Alias: (Alias)(s),
+ })
+}
+
+// UnmarshalJSON imports our Model from a Zipkin V2 API compatible span
+// representation.
+func (s *SpanModel) UnmarshalJSON(b []byte) error {
+ type Alias SpanModel
+ span := &struct {
+ T uint64 `json:"timestamp,omitempty"`
+ D uint64 `json:"duration,omitempty"`
+ *Alias
+ }{
+ Alias: (*Alias)(s),
+ }
+ if err := json.Unmarshal(b, &span); err != nil {
+ return err
+ }
+ if s.ID < 1 {
+ return ErrValidIDRequired
+ }
+ if span.T > 0 {
+ s.Timestamp = time.Unix(0, int64(span.T)*1e3)
+ }
+ s.Duration = time.Duration(span.D*1e3) * time.Nanosecond
+ if s.LocalEndpoint.Empty() {
+ s.LocalEndpoint = nil
+ }
+
+ if s.RemoteEndpoint.Empty() {
+ s.RemoteEndpoint = nil
+ }
+ return nil
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/model/span_id.go b/vendor/github.com/openzipkin/zipkin-go/model/span_id.go
new file mode 100644
index 0000000..1b5486a
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/model/span_id.go
@@ -0,0 +1,30 @@
+package model
+
+import (
+ "fmt"
+ "strconv"
+)
+
+// ID type
+type ID uint64
+
+// String outputs the 64-bit ID as hex string.
+func (i ID) String() string {
+ return fmt.Sprintf("%016x", uint64(i))
+}
+
+// MarshalJSON serializes an ID type (SpanID, ParentSpanID) to HEX.
+func (i ID) MarshalJSON() ([]byte, error) {
+ return []byte(fmt.Sprintf("%q", i.String())), nil
+}
+
+// UnmarshalJSON deserializes an ID type (SpanID, ParentSpanID) from HEX.
+func (i *ID) UnmarshalJSON(b []byte) (err error) {
+ var id uint64
+ if len(b) < 3 {
+ return nil
+ }
+ id, err = strconv.ParseUint(string(b[1:len(b)-1]), 16, 64)
+ *i = ID(id)
+ return err
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/model/traceid.go b/vendor/github.com/openzipkin/zipkin-go/model/traceid.go
new file mode 100644
index 0000000..fcbbcf7
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/model/traceid.go
@@ -0,0 +1,61 @@
+package model
+
+import (
+ "fmt"
+ "strconv"
+)
+
+// TraceID is a 128 bit number internally stored as 2x uint64 (high & low).
+// In case of 64 bit traceIDs, the value can be found in Low.
+type TraceID struct {
+ High uint64
+ Low uint64
+}
+
+// Empty returns if TraceID has zero value.
+func (t TraceID) Empty() bool {
+ return t.Low == 0 && t.High == 0
+}
+
+// String outputs the 128-bit traceID as hex string.
+func (t TraceID) String() string {
+ if t.High == 0 {
+ return fmt.Sprintf("%016x", t.Low)
+ }
+ return fmt.Sprintf("%016x%016x", t.High, t.Low)
+}
+
+// TraceIDFromHex returns the TraceID from a hex string.
+func TraceIDFromHex(h string) (t TraceID, err error) {
+ if len(h) > 16 {
+ if t.High, err = strconv.ParseUint(h[0:len(h)-16], 16, 64); err != nil {
+ return
+ }
+ t.Low, err = strconv.ParseUint(h[len(h)-16:], 16, 64)
+ return
+ }
+ t.Low, err = strconv.ParseUint(h, 16, 64)
+ return
+}
+
+// MarshalJSON custom JSON serializer to export the TraceID in the required
+// zero padded hex representation.
+func (t TraceID) MarshalJSON() ([]byte, error) {
+ return []byte(fmt.Sprintf("%q", t.String())), nil
+}
+
+// UnmarshalJSON custom JSON deserializer to retrieve the traceID from the hex
+// encoded representation.
+func (t *TraceID) UnmarshalJSON(traceID []byte) error {
+ if len(traceID) < 3 {
+ return ErrValidTraceIDRequired
+ }
+ // A valid JSON string is encoded wrapped in double quotes. We need to trim
+ // these before converting the hex payload.
+ tID, err := TraceIDFromHex(string(traceID[1 : len(traceID)-1]))
+ if err != nil {
+ return err
+ }
+ *t = tID
+ return nil
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/noop.go b/vendor/github.com/openzipkin/zipkin-go/noop.go
new file mode 100644
index 0000000..d1e3f75
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/noop.go
@@ -0,0 +1,25 @@
+package zipkin
+
+import (
+ "time"
+
+ "github.com/openzipkin/zipkin-go/model"
+)
+
+type noopSpan struct {
+ model.SpanContext
+}
+
+func (n *noopSpan) Context() model.SpanContext { return n.SpanContext }
+
+func (n *noopSpan) SetName(string) {}
+
+func (*noopSpan) SetRemoteEndpoint(*model.Endpoint) {}
+
+func (*noopSpan) Annotate(time.Time, string) {}
+
+func (*noopSpan) Tag(string, string) {}
+
+func (*noopSpan) Finish() {}
+
+func (*noopSpan) Flush() {}
diff --git a/vendor/github.com/openzipkin/zipkin-go/propagation/propagation.go b/vendor/github.com/openzipkin/zipkin-go/propagation/propagation.go
new file mode 100644
index 0000000..4168508
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/propagation/propagation.go
@@ -0,0 +1,16 @@
+/*
+Package propagation holds the required function signatures for Injection and
+Extraction as used by the Zipkin Tracer.
+
+Subpackages of this package contain officially supported standard propagation
+implementations.
+*/
+package propagation
+
+import "github.com/openzipkin/zipkin-go/model"
+
+// Extractor function signature
+type Extractor func() (*model.SpanContext, error)
+
+// Injector function signature
+type Injector func(model.SpanContext) error
diff --git a/vendor/github.com/openzipkin/zipkin-go/reporter/http/http.go b/vendor/github.com/openzipkin/zipkin-go/reporter/http/http.go
new file mode 100644
index 0000000..af3b8ee
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/reporter/http/http.go
@@ -0,0 +1,218 @@
+/*
+Package http implements a HTTP reporter to send spans to Zipkin V2 collectors.
+*/
+package http
+
+import (
+ "bytes"
+ "encoding/json"
+ "log"
+ "net/http"
+ "os"
+ "sync"
+ "time"
+
+ "github.com/openzipkin/zipkin-go/model"
+ "github.com/openzipkin/zipkin-go/reporter"
+)
+
+// defaults
+const (
+ defaultTimeout = time.Second * 5 // timeout for http request in seconds
+ defaultBatchInterval = time.Second * 1 // BatchInterval in seconds
+ defaultBatchSize = 100
+ defaultMaxBacklog = 1000
+)
+
+// httpReporter will send spans to a Zipkin HTTP Collector using Zipkin V2 API.
+type httpReporter struct {
+ url string
+ client *http.Client
+ logger *log.Logger
+ batchInterval time.Duration
+ batchSize int
+ maxBacklog int
+ sendMtx *sync.Mutex
+ batchMtx *sync.Mutex
+ batch []*model.SpanModel
+ spanC chan *model.SpanModel
+ quit chan struct{}
+ shutdown chan error
+ reqCallback RequestCallbackFn
+}
+
+// Send implements reporter
+func (r *httpReporter) Send(s model.SpanModel) {
+ r.spanC <- &s
+}
+
+// Close implements reporter
+func (r *httpReporter) Close() error {
+ close(r.quit)
+ return <-r.shutdown
+}
+
+func (r *httpReporter) loop() {
+ var (
+ nextSend = time.Now().Add(r.batchInterval)
+ ticker = time.NewTicker(r.batchInterval / 10)
+ tickerChan = ticker.C
+ )
+ defer ticker.Stop()
+
+ for {
+ select {
+ case span := <-r.spanC:
+ currentBatchSize := r.append(span)
+ if currentBatchSize >= r.batchSize {
+ nextSend = time.Now().Add(r.batchInterval)
+ go func() {
+ _ = r.sendBatch()
+ }()
+ }
+ case <-tickerChan:
+ if time.Now().After(nextSend) {
+ nextSend = time.Now().Add(r.batchInterval)
+ go func() {
+ _ = r.sendBatch()
+ }()
+ }
+ case <-r.quit:
+ r.shutdown <- r.sendBatch()
+ return
+ }
+ }
+}
+
+func (r *httpReporter) append(span *model.SpanModel) (newBatchSize int) {
+ r.batchMtx.Lock()
+
+ r.batch = append(r.batch, span)
+ if len(r.batch) > r.maxBacklog {
+ dispose := len(r.batch) - r.maxBacklog
+ r.logger.Printf("backlog too long, disposing %d spans", dispose)
+ r.batch = r.batch[dispose:]
+ }
+ newBatchSize = len(r.batch)
+
+ r.batchMtx.Unlock()
+ return
+}
+
+func (r *httpReporter) sendBatch() error {
+ // in order to prevent sending the same batch twice
+ r.sendMtx.Lock()
+ defer r.sendMtx.Unlock()
+
+ // Select all current spans in the batch to be sent
+ r.batchMtx.Lock()
+ sendBatch := r.batch[:]
+ r.batchMtx.Unlock()
+
+ if len(sendBatch) == 0 {
+ return nil
+ }
+
+ body, err := json.Marshal(sendBatch)
+ if err != nil {
+ r.logger.Printf("failed when marshalling the spans batch: %s\n", err.Error())
+ return err
+ }
+
+ req, err := http.NewRequest("POST", r.url, bytes.NewReader(body))
+ if err != nil {
+ r.logger.Printf("failed when creating the request: %s\n", err.Error())
+ return err
+ }
+ req.Header.Set("Content-Type", "application/json")
+ if r.reqCallback != nil {
+ r.reqCallback(req)
+ }
+
+ resp, err := r.client.Do(req)
+ if err != nil {
+ r.logger.Printf("failed to send the request: %s\n", err.Error())
+ return err
+ }
+ _ = resp.Body.Close()
+ if resp.StatusCode < 200 || resp.StatusCode > 299 {
+ r.logger.Printf("failed the request with status code %d\n", resp.StatusCode)
+ }
+
+ // Remove sent spans from the batch even if they were not saved
+ r.batchMtx.Lock()
+ r.batch = r.batch[len(sendBatch):]
+ r.batchMtx.Unlock()
+
+ return nil
+}
+
+// RequestCallbackFn receives the initialized request from the Collector before
+// sending it over the wire. This allows one to plug in additional headers or
+// do other customization.
+type RequestCallbackFn func(*http.Request)
+
+// ReporterOption sets a parameter for the HTTP Reporter
+type ReporterOption func(r *httpReporter)
+
+// Timeout sets maximum timeout for http request.
+func Timeout(duration time.Duration) ReporterOption {
+ return func(r *httpReporter) { r.client.Timeout = duration }
+}
+
+// BatchSize sets the maximum batch size, after which a collect will be
+// triggered. The default batch size is 100 traces.
+func BatchSize(n int) ReporterOption {
+ return func(r *httpReporter) { r.batchSize = n }
+}
+
+// MaxBacklog sets the maximum backlog size. When batch size reaches this
+// threshold, spans from the beginning of the batch will be disposed.
+func MaxBacklog(n int) ReporterOption {
+ return func(r *httpReporter) { r.maxBacklog = n }
+}
+
+// BatchInterval sets the maximum duration we will buffer traces before
+// emitting them to the collector. The default batch interval is 1 second.
+func BatchInterval(d time.Duration) ReporterOption {
+ return func(r *httpReporter) { r.batchInterval = d }
+}
+
+// Client sets a custom http client to use.
+func Client(client *http.Client) ReporterOption {
+ return func(r *httpReporter) { r.client = client }
+}
+
+// RequestCallback registers a callback function to adjust the reporter
+// *http.Request before it sends the request to Zipkin.
+func RequestCallback(rc RequestCallbackFn) ReporterOption {
+ return func(r *httpReporter) { r.reqCallback = rc }
+}
+
+// NewReporter returns a new HTTP Reporter.
+// url should be the endpoint to send the spans to, e.g.
+// http://localhost:9411/api/v2/spans
+func NewReporter(url string, opts ...ReporterOption) reporter.Reporter {
+ r := httpReporter{
+ url: url,
+ logger: log.New(os.Stderr, "", log.LstdFlags),
+ client: &http.Client{Timeout: defaultTimeout},
+ batchInterval: defaultBatchInterval,
+ batchSize: defaultBatchSize,
+ maxBacklog: defaultMaxBacklog,
+ batch: []*model.SpanModel{},
+ spanC: make(chan *model.SpanModel),
+ quit: make(chan struct{}, 1),
+ shutdown: make(chan error, 1),
+ sendMtx: &sync.Mutex{},
+ batchMtx: &sync.Mutex{},
+ }
+
+ for _, opt := range opts {
+ opt(&r)
+ }
+
+ go r.loop()
+
+ return &r
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/reporter/reporter.go b/vendor/github.com/openzipkin/zipkin-go/reporter/reporter.go
new file mode 100644
index 0000000..09b877e
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/reporter/reporter.go
@@ -0,0 +1,27 @@
+/*
+Package reporter holds the Reporter interface which is used by the Zipkin
+Tracer to send finished spans.
+
+Subpackages of package reporter contain officially supported standard
+reporter implementations.
+*/
+package reporter
+
+import "github.com/openzipkin/zipkin-go/model"
+
+// Reporter interface can be used to provide the Zipkin Tracer with custom
+// implementations to publish Zipkin Span data.
+type Reporter interface {
+ Send(model.SpanModel) // Send Span data to the reporter
+ Close() error // Close the reporter
+}
+
+type noopReporter struct{}
+
+func (r *noopReporter) Send(model.SpanModel) {}
+func (r *noopReporter) Close() error { return nil }
+
+// NewNoopReporter returns a no-op Reporter implementation.
+func NewNoopReporter() Reporter {
+ return &noopReporter{}
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/sample.go b/vendor/github.com/openzipkin/zipkin-go/sample.go
new file mode 100644
index 0000000..248b8f5
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/sample.go
@@ -0,0 +1,113 @@
+package zipkin
+
+import (
+ "fmt"
+ "math"
+ "math/rand"
+ "sync"
+ "time"
+)
+
+// Sampler functions return if a Zipkin span should be sampled, based on its
+// traceID.
+type Sampler func(id uint64) bool
+
+// NeverSample will always return false. If used by a service it will not allow
+// the service to start traces but will still allow the service to participate
+// in traces started upstream.
+func NeverSample(_ uint64) bool { return false }
+
+// AlwaysSample will always return true. If used by a service it will always start
+// traces if no upstream trace has been propagated. If an incoming upstream trace
+// is not sampled the service will adhere to this and only propagate the context.
+func AlwaysSample(_ uint64) bool { return true }
+
+// NewModuloSampler provides a generic type Sampler.
+func NewModuloSampler(mod uint64) Sampler {
+ if mod < 2 {
+ return AlwaysSample
+ }
+ return func(id uint64) bool {
+ return (id % mod) == 0
+ }
+}
+
+// NewBoundarySampler is appropriate for high-traffic instrumentation who
+// provision random trace ids, and make the sampling decision only once.
+// It defends against nodes in the cluster selecting exactly the same ids.
+func NewBoundarySampler(rate float64, salt int64) (Sampler, error) {
+ if rate == 0.0 {
+ return NeverSample, nil
+ }
+ if rate == 1.0 {
+ return AlwaysSample, nil
+ }
+ if rate < 0.0001 || rate > 1 {
+ return nil, fmt.Errorf("rate should be 0.0 or between 0.0001 and 1: was %f", rate)
+ }
+
+ var (
+ boundary = int64(rate * 10000)
+ usalt = uint64(salt)
+ )
+ return func(id uint64) bool {
+ return int64(math.Abs(float64(id^usalt)))%10000 < boundary
+ }, nil
+}
+
+// NewCountingSampler is appropriate for low-traffic instrumentation or
+// those who do not provision random trace ids. It is not appropriate for
+// collectors as the sampling decision isn't idempotent (consistent based
+// on trace id).
+func NewCountingSampler(rate float64) (Sampler, error) {
+ if rate == 0.0 {
+ return NeverSample, nil
+ }
+ if rate == 1.0 {
+ return AlwaysSample, nil
+ }
+ if rate < 0.01 || rate > 1 {
+ return nil, fmt.Errorf("rate should be 0.0 or between 0.01 and 1: was %f", rate)
+ }
+ var (
+ i = 0
+ outOf100 = int(rate*100 + math.Copysign(0.5, rate*100)) // for rounding float to int conversion instead of truncation
+ decisions = randomBitSet(100, outOf100, rand.New(rand.NewSource(time.Now().UnixNano())))
+ mtx = &sync.Mutex{}
+ )
+
+ return func(_ uint64) bool {
+ mtx.Lock()
+ result := decisions[i]
+ i++
+ if i == 100 {
+ i = 0
+ }
+ mtx.Unlock()
+ return result
+ }, nil
+}
+
+/**
+ * Reservoir sampling algorithm borrowed from Stack Overflow.
+ *
+ * http://stackoverflow.com/questions/12817946/generate-a-random-bitset-with-n-1s
+ */
+func randomBitSet(size int, cardinality int, rnd *rand.Rand) []bool {
+ result := make([]bool, size)
+ chosen := make([]int, cardinality)
+ var i int
+ for i = 0; i < cardinality; i++ {
+ chosen[i] = i
+ result[i] = true
+ }
+ for ; i < size; i++ {
+ j := rnd.Intn(i + 1)
+ if j < cardinality {
+ result[chosen[j]] = false
+ result[i] = true
+ chosen[j] = i
+ }
+ }
+ return result
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/span.go b/vendor/github.com/openzipkin/zipkin-go/span.go
new file mode 100644
index 0000000..7d03924
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/span.go
@@ -0,0 +1,38 @@
+package zipkin
+
+import (
+ "time"
+
+ "github.com/openzipkin/zipkin-go/model"
+)
+
+// Span interface as returned by Tracer.StartSpan()
+type Span interface {
+ // Context returns the Span's SpanContext.
+ Context() model.SpanContext
+
+ // SetName updates the Span's name.
+ SetName(string)
+
+ // SetRemoteEndpoint updates the Span's Remote Endpoint.
+ SetRemoteEndpoint(*model.Endpoint)
+
+ // Annotate adds a timed event to the Span.
+ Annotate(time.Time, string)
+
+ // Tag sets Tag with given key and value to the Span. If key already exists in
+ // the Span the value will be overridden except for error tags where the first
+ // value is persisted.
+ Tag(string, string)
+
+ // Finish the Span and send to Reporter. If DelaySend option was used at
+ // Span creation time, Finish will not send the Span to the Reporter. It then
+ // becomes the user's responsibility to get the Span reported (by using
+ // span.Flush).
+ Finish()
+
+ // Flush the Span to the Reporter (regardless of being finished or not).
+ // This can be used if the DelaySend SpanOption was set or when dealing with
+ // one-way RPC tracing where duration might not be measured.
+ Flush()
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/span_implementation.go b/vendor/github.com/openzipkin/zipkin-go/span_implementation.go
new file mode 100644
index 0000000..5872308
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/span_implementation.go
@@ -0,0 +1,78 @@
+package zipkin
+
+import (
+ "sync"
+ "sync/atomic"
+ "time"
+
+ "github.com/openzipkin/zipkin-go/model"
+)
+
+type spanImpl struct {
+ mtx sync.RWMutex
+ model.SpanModel
+ tracer *Tracer
+ mustCollect int32 // used as atomic bool (1 = true, 0 = false)
+ flushOnFinish bool
+}
+
+func (s *spanImpl) Context() model.SpanContext {
+ return s.SpanContext
+}
+
+func (s *spanImpl) SetName(name string) {
+ s.mtx.Lock()
+ s.Name = name
+ s.mtx.Unlock()
+}
+
+func (s *spanImpl) SetRemoteEndpoint(e *model.Endpoint) {
+ s.mtx.Lock()
+ if e == nil {
+ s.RemoteEndpoint = nil
+ } else {
+ s.RemoteEndpoint = &model.Endpoint{}
+ *s.RemoteEndpoint = *e
+ }
+ s.mtx.Unlock()
+}
+
+func (s *spanImpl) Annotate(t time.Time, value string) {
+ a := model.Annotation{
+ Timestamp: t,
+ Value: value,
+ }
+
+ s.mtx.Lock()
+ s.Annotations = append(s.Annotations, a)
+ s.mtx.Unlock()
+}
+
+func (s *spanImpl) Tag(key, value string) {
+ s.mtx.Lock()
+
+ if key == string(TagError) {
+ if _, found := s.Tags[key]; found {
+ s.mtx.Unlock()
+ return
+ }
+ }
+
+ s.Tags[key] = value
+ s.mtx.Unlock()
+}
+
+func (s *spanImpl) Finish() {
+ if atomic.CompareAndSwapInt32(&s.mustCollect, 1, 0) {
+ s.Duration = time.Since(s.Timestamp)
+ if s.flushOnFinish {
+ s.tracer.reporter.Send(s.SpanModel)
+ }
+ }
+}
+
+func (s *spanImpl) Flush() {
+ if s.SpanModel.Debug || (s.SpanModel.Sampled != nil && *s.SpanModel.Sampled) {
+ s.tracer.reporter.Send(s.SpanModel)
+ }
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/span_options.go b/vendor/github.com/openzipkin/zipkin-go/span_options.go
new file mode 100644
index 0000000..e6fbcf0
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/span_options.go
@@ -0,0 +1,74 @@
+package zipkin
+
+import (
+ "time"
+
+ "github.com/openzipkin/zipkin-go/model"
+)
+
+// SpanOption allows for functional options to adjust behavior and payload of
+// the Span to be created with tracer.StartSpan().
+type SpanOption func(t *Tracer, s *spanImpl)
+
+// Kind sets the kind of the span being created..
+func Kind(kind model.Kind) SpanOption {
+ return func(t *Tracer, s *spanImpl) {
+ s.Kind = kind
+ }
+}
+
+// Parent will use provided SpanContext as parent to the span being created.
+func Parent(sc model.SpanContext) SpanOption {
+ return func(t *Tracer, s *spanImpl) {
+ if sc.Err != nil {
+ // encountered an extraction error
+ switch t.extractFailurePolicy {
+ case ExtractFailurePolicyRestart:
+ case ExtractFailurePolicyError:
+ panic(s.SpanContext.Err)
+ case ExtractFailurePolicyTagAndRestart:
+ s.Tags["error.extract"] = sc.Err.Error()
+ default:
+ panic(ErrInvalidExtractFailurePolicy)
+ }
+ /* don't use provided SpanContext, but restart trace */
+ return
+ }
+ s.SpanContext = sc
+ }
+}
+
+// StartTime uses a given start time for the span being created.
+func StartTime(start time.Time) SpanOption {
+ return func(t *Tracer, s *spanImpl) {
+ s.Timestamp = start
+ }
+}
+
+// RemoteEndpoint sets the remote endpoint of the span being created.
+func RemoteEndpoint(e *model.Endpoint) SpanOption {
+ return func(t *Tracer, s *spanImpl) {
+ s.RemoteEndpoint = e
+ }
+}
+
+// Tags sets initial tags for the span being created. If default tracer tags
+// are present they will be overwritten on key collisions.
+func Tags(tags map[string]string) SpanOption {
+ return func(t *Tracer, s *spanImpl) {
+ for k, v := range tags {
+ s.Tags[k] = v
+ }
+ }
+}
+
+// FlushOnFinish when set to false will disable span.Finish() to send the Span
+// to the Reporter automatically (which is the default behavior). If set to
+// false, having the Span be reported becomes the responsibility of the user.
+// This is available if late tag data is expected to be only available after the
+// required finish time of the Span.
+func FlushOnFinish(b bool) SpanOption {
+ return func(t *Tracer, s *spanImpl) {
+ s.flushOnFinish = b
+ }
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/tags.go b/vendor/github.com/openzipkin/zipkin-go/tags.go
new file mode 100644
index 0000000..28be6dd
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/tags.go
@@ -0,0 +1,23 @@
+package zipkin
+
+// Tag holds available types
+type Tag string
+
+// Common Tag values
+const (
+ TagHTTPMethod Tag = "http.method"
+ TagHTTPPath Tag = "http.path"
+ TagHTTPUrl Tag = "http.url"
+ TagHTTPRoute Tag = "http.route"
+ TagHTTPStatusCode Tag = "http.status_code"
+ TagHTTPRequestSize Tag = "http.request.size"
+ TagHTTPResponseSize Tag = "http.response.size"
+ TagGRPCStatusCode Tag = "grpc.status_code"
+ TagSQLQuery Tag = "sql.query"
+ TagError Tag = "error"
+)
+
+// Set a standard Tag with a payload on provided Span.
+func (t Tag) Set(s Span, value string) {
+ s.Tag(string(t), value)
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/tracer.go b/vendor/github.com/openzipkin/zipkin-go/tracer.go
new file mode 100644
index 0000000..a050e30
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/tracer.go
@@ -0,0 +1,173 @@
+package zipkin
+
+import (
+ "context"
+ "sync/atomic"
+ "time"
+
+ "github.com/openzipkin/zipkin-go/idgenerator"
+ "github.com/openzipkin/zipkin-go/model"
+ "github.com/openzipkin/zipkin-go/propagation"
+ "github.com/openzipkin/zipkin-go/reporter"
+)
+
+// Tracer is our Zipkin tracer implementation. It should be initialized using
+// the NewTracer method.
+type Tracer struct {
+ defaultTags map[string]string
+ extractFailurePolicy ExtractFailurePolicy
+ sampler Sampler
+ generate idgenerator.IDGenerator
+ reporter reporter.Reporter
+ localEndpoint *model.Endpoint
+ noop int32 // used as atomic bool (1 = true, 0 = false)
+ sharedSpans bool
+ unsampledNoop bool
+}
+
+// NewTracer returns a new Zipkin Tracer.
+func NewTracer(rep reporter.Reporter, opts ...TracerOption) (*Tracer, error) {
+ // set default tracer options
+ t := &Tracer{
+ defaultTags: make(map[string]string),
+ extractFailurePolicy: ExtractFailurePolicyRestart,
+ sampler: AlwaysSample,
+ generate: idgenerator.NewRandom64(),
+ reporter: rep,
+ localEndpoint: nil,
+ noop: 0,
+ sharedSpans: true,
+ unsampledNoop: false,
+ }
+
+ // if no reporter was provided we default to noop implementation.
+ if t.reporter == nil {
+ t.reporter = reporter.NewNoopReporter()
+ t.noop = 1
+ }
+
+ // process functional options
+ for _, opt := range opts {
+ if err := opt(t); err != nil {
+ return nil, err
+ }
+ }
+
+ return t, nil
+}
+
+// StartSpanFromContext creates and starts a span using the span found in
+// context as parent. If no parent span is found a root span is created.
+func (t *Tracer) StartSpanFromContext(ctx context.Context, name string, options ...SpanOption) (Span, context.Context) {
+ if parentSpan := SpanFromContext(ctx); parentSpan != nil {
+ options = append(options, Parent(parentSpan.Context()))
+ }
+ span := t.StartSpan(name, options...)
+ return span, NewContext(ctx, span)
+}
+
+// StartSpan creates and starts a span.
+func (t *Tracer) StartSpan(name string, options ...SpanOption) Span {
+ if atomic.LoadInt32(&t.noop) == 1 {
+ return &noopSpan{}
+ }
+ s := &spanImpl{
+ SpanModel: model.SpanModel{
+ Kind: model.Undetermined,
+ Name: name,
+ LocalEndpoint: t.localEndpoint,
+ Annotations: make([]model.Annotation, 0),
+ Tags: make(map[string]string),
+ },
+ flushOnFinish: true,
+ tracer: t,
+ }
+
+ // add default tracer tags to span
+ for k, v := range t.defaultTags {
+ s.Tag(k, v)
+ }
+
+ // handle provided functional options
+ for _, option := range options {
+ option(t, s)
+ }
+
+ if s.TraceID.Empty() {
+ // create root span
+ s.SpanContext.TraceID = t.generate.TraceID()
+ s.SpanContext.ID = t.generate.SpanID(s.SpanContext.TraceID)
+ } else {
+ // valid parent context found
+ if t.sharedSpans && s.Kind == model.Server {
+ // join span
+ s.Shared = true
+ } else {
+ // regular child span
+ parentID := s.SpanContext.ID
+ s.SpanContext.ParentID = &parentID
+ s.SpanContext.ID = t.generate.SpanID(model.TraceID{})
+ }
+ }
+
+ if !s.SpanContext.Debug && s.Sampled == nil {
+ // deferred sampled context found, invoke sampler
+ sampled := t.sampler(s.SpanContext.TraceID.Low)
+ s.SpanContext.Sampled = &sampled
+ if sampled {
+ s.mustCollect = 1
+ }
+ } else {
+ if s.SpanContext.Debug || *s.Sampled {
+ s.mustCollect = 1
+ }
+ }
+
+ if t.unsampledNoop && s.mustCollect == 0 {
+ // trace not being sampled and noop requested
+ return &noopSpan{
+ SpanContext: s.SpanContext,
+ }
+ }
+
+ // add start time
+ if s.Timestamp.IsZero() {
+ s.Timestamp = time.Now()
+ }
+
+ return s
+}
+
+// Extract extracts a SpanContext using the provided Extractor function.
+func (t *Tracer) Extract(extractor propagation.Extractor) (sc model.SpanContext) {
+ if atomic.LoadInt32(&t.noop) == 1 {
+ return
+ }
+ psc, err := extractor()
+ if psc != nil {
+ sc = *psc
+ }
+ sc.Err = err
+ return
+}
+
+// SetNoop allows for killswitch behavior. If set to true the tracer will return
+// noopSpans and all data is dropped. This allows operators to stop tracing in
+// risk scenarios. Set back to false to resume tracing.
+func (t *Tracer) SetNoop(noop bool) {
+ if noop {
+ atomic.CompareAndSwapInt32(&t.noop, 0, 1)
+ } else {
+ atomic.CompareAndSwapInt32(&t.noop, 1, 0)
+ }
+}
+
+// LocalEndpoint returns a copy of the currently set local endpoint of the
+// tracer instance.
+func (t *Tracer) LocalEndpoint() *model.Endpoint {
+ if t.localEndpoint == nil {
+ return nil
+ }
+ ep := *t.localEndpoint
+ return &ep
+}
diff --git a/vendor/github.com/openzipkin/zipkin-go/tracer_options.go b/vendor/github.com/openzipkin/zipkin-go/tracer_options.go
new file mode 100644
index 0000000..7a3608f
--- /dev/null
+++ b/vendor/github.com/openzipkin/zipkin-go/tracer_options.go
@@ -0,0 +1,124 @@
+package zipkin
+
+import (
+ "errors"
+
+ "github.com/openzipkin/zipkin-go/idgenerator"
+ "github.com/openzipkin/zipkin-go/model"
+)
+
+// Tracer Option Errors
+var (
+ ErrInvalidEndpoint = errors.New("requires valid local endpoint")
+ ErrInvalidExtractFailurePolicy = errors.New("invalid extract failure policy provided")
+)
+
+// ExtractFailurePolicy deals with Extraction errors
+type ExtractFailurePolicy int
+
+// ExtractFailurePolicyOptions
+const (
+ ExtractFailurePolicyRestart ExtractFailurePolicy = iota
+ ExtractFailurePolicyError
+ ExtractFailurePolicyTagAndRestart
+)
+
+// TracerOption allows for functional options to adjust behavior of the Tracer
+// to be created with NewTracer().
+type TracerOption func(o *Tracer) error
+
+// WithLocalEndpoint sets the local endpoint of the tracer.
+func WithLocalEndpoint(e *model.Endpoint) TracerOption {
+ return func(o *Tracer) error {
+ if e == nil {
+ o.localEndpoint = nil
+ return nil
+ }
+ ep := *e
+ o.localEndpoint = &ep
+ return nil
+ }
+}
+
+// WithExtractFailurePolicy allows one to set the ExtractFailurePolicy.
+func WithExtractFailurePolicy(p ExtractFailurePolicy) TracerOption {
+ return func(o *Tracer) error {
+ if p < 0 || p > ExtractFailurePolicyTagAndRestart {
+ return ErrInvalidExtractFailurePolicy
+ }
+ o.extractFailurePolicy = p
+ return nil
+ }
+}
+
+// WithNoopSpan if set to true will switch to a NoopSpan implementation
+// if the trace is not sampled.
+func WithNoopSpan(unsampledNoop bool) TracerOption {
+ return func(o *Tracer) error {
+ o.unsampledNoop = unsampledNoop
+ return nil
+ }
+}
+
+// WithSharedSpans allows to place client-side and server-side annotations
+// for a RPC call in the same span (Zipkin V1 behavior) or different spans
+// (more in line with other tracing solutions). By default this Tracer
+// uses shared host spans (so client-side and server-side in the same span).
+func WithSharedSpans(val bool) TracerOption {
+ return func(o *Tracer) error {
+ o.sharedSpans = val
+ return nil
+ }
+}
+
+// WithSampler allows one to set a Sampler function
+func WithSampler(sampler Sampler) TracerOption {
+ return func(o *Tracer) error {
+ o.sampler = sampler
+ return nil
+ }
+}
+
+// WithTraceID128Bit if set to true will instruct the Tracer to start traces
+// with 128 bit TraceID's. If set to false the Tracer will start traces with
+// 64 bits.
+func WithTraceID128Bit(val bool) TracerOption {
+ return func(o *Tracer) error {
+ if val {
+ o.generate = idgenerator.NewRandom128()
+ } else {
+ o.generate = idgenerator.NewRandom64()
+ }
+ return nil
+ }
+}
+
+// WithIDGenerator allows one to set a custom ID Generator
+func WithIDGenerator(generator idgenerator.IDGenerator) TracerOption {
+ return func(o *Tracer) error {
+ o.generate = generator
+ return nil
+ }
+}
+
+// WithTags allows one to set default tags to be added to each created span
+func WithTags(tags map[string]string) TracerOption {
+ return func(o *Tracer) error {
+ for k, v := range tags {
+ o.defaultTags[k] = v
+ }
+ return nil
+ }
+}
+
+// WithNoopTracer allows one to start the Tracer as Noop implementation.
+func WithNoopTracer(tracerNoop bool) TracerOption {
+ return func(o *Tracer) error {
+ if tracerNoop {
+ o.noop = 1
+ } else {
+ o.noop = 0
+ }
+ return nil
+ }
+}
diff --git a/vendor/go.opencensus.io/AUTHORS b/vendor/go.opencensus.io/AUTHORS
new file mode 100644
index 0000000..e491a9e
--- /dev/null
+++ b/vendor/go.opencensus.io/AUTHORS
@@ -0,0 +1 @@
+Google Inc.
diff --git a/vendor/go.opencensus.io/CONTRIBUTING.md b/vendor/go.opencensus.io/CONTRIBUTING.md
new file mode 100644
index 0000000..3f3aed3
--- /dev/null
+++ b/vendor/go.opencensus.io/CONTRIBUTING.md
@@ -0,0 +1,56 @@
+# How to contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution,
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult [GitHub Help] for more
+information on using pull requests.
+
+[GitHub Help]: https://help.github.com/articles/about-pull-requests/
+
+## Instructions
+
+Fork the repo, checkout the upstream repo to your GOPATH by:
+
+```
+$ go get -d go.opencensus.io
+```
+
+Add your fork as an origin:
+
+```
+cd $(go env GOPATH)/src/go.opencensus.io
+git remote add fork git@github.com:YOUR_GITHUB_USERNAME/opencensus-go.git
+```
+
+Run tests:
+
+```
+$ go test ./...
+```
+
+Checkout a new branch, make modifications and push the branch to your fork:
+
+```
+$ git checkout -b feature
+# edit files
+$ git commit
+$ git push fork feature
+```
+
+Open a pull request against the main opencensus-go repo.
diff --git a/vendor/go.opencensus.io/Gopkg.lock b/vendor/go.opencensus.io/Gopkg.lock
new file mode 100644
index 0000000..3be12ac
--- /dev/null
+++ b/vendor/go.opencensus.io/Gopkg.lock
@@ -0,0 +1,231 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+ branch = "master"
+ digest = "1:eee9386329f4fcdf8d6c0def0c9771b634bdd5ba460d888aa98c17d59b37a76c"
+ name = "git.apache.org/thrift.git"
+ packages = ["lib/go/thrift"]
+ pruneopts = "UT"
+ revision = "6e67faa92827ece022380b211c2caaadd6145bf5"
+ source = "github.com/apache/thrift"
+
+[[projects]]
+ branch = "master"
+ digest = "1:d6afaeed1502aa28e80a4ed0981d570ad91b2579193404256ce672ed0a609e0d"
+ name = "github.com/beorn7/perks"
+ packages = ["quantile"]
+ pruneopts = "UT"
+ revision = "3a771d992973f24aa725d07868b467d1ddfceafb"
+
+[[projects]]
+ digest = "1:4c0989ca0bcd10799064318923b9bc2db6b4d6338dd75f3f2d86c3511aaaf5cf"
+ name = "github.com/golang/protobuf"
+ packages = [
+ "proto",
+ "ptypes",
+ "ptypes/any",
+ "ptypes/duration",
+ "ptypes/timestamp",
+ ]
+ pruneopts = "UT"
+ revision = "aa810b61a9c79d51363740d207bb46cf8e620ed5"
+ version = "v1.2.0"
+
+[[projects]]
+ digest = "1:ff5ebae34cfbf047d505ee150de27e60570e8c394b3b8fdbb720ff6ac71985fc"
+ name = "github.com/matttproud/golang_protobuf_extensions"
+ packages = ["pbutil"]
+ pruneopts = "UT"
+ revision = "c12348ce28de40eed0136aa2b644d0ee0650e56c"
+ version = "v1.0.1"
+
+[[projects]]
+ digest = "1:824c8f3aa4c5f23928fa84ebbd5ed2e9443b3f0cb958a40c1f2fbed5cf5e64b1"
+ name = "github.com/openzipkin/zipkin-go"
+ packages = [
+ ".",
+ "idgenerator",
+ "model",
+ "propagation",
+ "reporter",
+ "reporter/http",
+ ]
+ pruneopts = "UT"
+ revision = "d455a5674050831c1e187644faa4046d653433c2"
+ version = "v0.1.1"
+
+[[projects]]
+ digest = "1:d14a5f4bfecf017cb780bdde1b6483e5deb87e12c332544d2c430eda58734bcb"
+ name = "github.com/prometheus/client_golang"
+ packages = [
+ "prometheus",
+ "prometheus/promhttp",
+ ]
+ pruneopts = "UT"
+ revision = "c5b7fccd204277076155f10851dad72b76a49317"
+ version = "v0.8.0"
+
+[[projects]]
+ branch = "master"
+ digest = "1:2d5cd61daa5565187e1d96bae64dbbc6080dacf741448e9629c64fd93203b0d4"
+ name = "github.com/prometheus/client_model"
+ packages = ["go"]
+ pruneopts = "UT"
+ revision = "5c3871d89910bfb32f5fcab2aa4b9ec68e65a99f"
+
+[[projects]]
+ branch = "master"
+ digest = "1:63b68062b8968092eb86bedc4e68894bd096ea6b24920faca8b9dcf451f54bb5"
+ name = "github.com/prometheus/common"
+ packages = [
+ "expfmt",
+ "internal/bitbucket.org/ww/goautoneg",
+ "model",
+ ]
+ pruneopts = "UT"
+ revision = "c7de2306084e37d54b8be01f3541a8464345e9a5"
+
+[[projects]]
+ branch = "master"
+ digest = "1:8c49953a1414305f2ff5465147ee576dd705487c35b15918fcd4efdc0cb7a290"
+ name = "github.com/prometheus/procfs"
+ packages = [
+ ".",
+ "internal/util",
+ "nfs",
+ "xfs",
+ ]
+ pruneopts = "UT"
+ revision = "05ee40e3a273f7245e8777337fc7b46e533a9a92"
+
+[[projects]]
+ branch = "master"
+ digest = "1:deafe4ab271911fec7de5b693d7faae3f38796d9eb8622e2b9e7df42bb3dfea9"
+ name = "golang.org/x/net"
+ packages = [
+ "context",
+ "http/httpguts",
+ "http2",
+ "http2/hpack",
+ "idna",
+ "internal/timeseries",
+ "trace",
+ ]
+ pruneopts = "UT"
+ revision = "922f4815f713f213882e8ef45e0d315b164d705c"
+
+[[projects]]
+ branch = "master"
+ digest = "1:e0140c0c868c6e0f01c0380865194592c011fe521d6e12d78bfd33e756fe018a"
+ name = "golang.org/x/sync"
+ packages = ["semaphore"]
+ pruneopts = "UT"
+ revision = "1d60e4601c6fd243af51cc01ddf169918a5407ca"
+
+[[projects]]
+ branch = "master"
+ digest = "1:a3f00ac457c955fe86a41e1495e8f4c54cb5399d609374c5cc26aa7d72e542c8"
+ name = "golang.org/x/sys"
+ packages = ["unix"]
+ pruneopts = "UT"
+ revision = "3b58ed4ad3395d483fc92d5d14123ce2c3581fec"
+
+[[projects]]
+ digest = "1:a2ab62866c75542dd18d2b069fec854577a20211d7c0ea6ae746072a1dccdd18"
+ name = "golang.org/x/text"
+ packages = [
+ "collate",
+ "collate/build",
+ "internal/colltab",
+ "internal/gen",
+ "internal/tag",
+ "internal/triegen",
+ "internal/ucd",
+ "language",
+ "secure/bidirule",
+ "transform",
+ "unicode/bidi",
+ "unicode/cldr",
+ "unicode/norm",
+ "unicode/rangetable",
+ ]
+ pruneopts = "UT"
+ revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
+ version = "v0.3.0"
+
+[[projects]]
+ branch = "master"
+ digest = "1:c0c17c94fe8bc1ab34e7f586a4a8b788c5e1f4f9f750ff23395b8b2f5a523530"
+ name = "google.golang.org/api"
+ packages = ["support/bundler"]
+ pruneopts = "UT"
+ revision = "e21acd801f91da814261b938941d193bb036441a"
+
+[[projects]]
+ branch = "master"
+ digest = "1:077c1c599507b3b3e9156d17d36e1e61928ee9b53a5b420f10f28ebd4a0b275c"
+ name = "google.golang.org/genproto"
+ packages = ["googleapis/rpc/status"]
+ pruneopts = "UT"
+ revision = "c66870c02cf823ceb633bcd05be3c7cda29976f4"
+
+[[projects]]
+ digest = "1:3dd7996ce6bf52dec6a2f69fa43e7c4cefea1d4dfa3c8ab7a5f8a9f7434e239d"
+ name = "google.golang.org/grpc"
+ packages = [
+ ".",
+ "balancer",
+ "balancer/base",
+ "balancer/roundrobin",
+ "codes",
+ "connectivity",
+ "credentials",
+ "encoding",
+ "encoding/proto",
+ "grpclog",
+ "internal",
+ "internal/backoff",
+ "internal/channelz",
+ "internal/envconfig",
+ "internal/grpcrand",
+ "internal/transport",
+ "keepalive",
+ "metadata",
+ "naming",
+ "peer",
+ "resolver",
+ "resolver/dns",
+ "resolver/passthrough",
+ "stats",
+ "status",
+ "tap",
+ ]
+ pruneopts = "UT"
+ revision = "32fb0ac620c32ba40a4626ddf94d90d12cce3455"
+ version = "v1.14.0"
+
+[solve-meta]
+ analyzer-name = "dep"
+ analyzer-version = 1
+ input-imports = [
+ "git.apache.org/thrift.git/lib/go/thrift",
+ "github.com/golang/protobuf/proto",
+ "github.com/openzipkin/zipkin-go",
+ "github.com/openzipkin/zipkin-go/model",
+ "github.com/openzipkin/zipkin-go/reporter",
+ "github.com/openzipkin/zipkin-go/reporter/http",
+ "github.com/prometheus/client_golang/prometheus",
+ "github.com/prometheus/client_golang/prometheus/promhttp",
+ "golang.org/x/net/context",
+ "golang.org/x/net/http2",
+ "google.golang.org/api/support/bundler",
+ "google.golang.org/grpc",
+ "google.golang.org/grpc/codes",
+ "google.golang.org/grpc/grpclog",
+ "google.golang.org/grpc/metadata",
+ "google.golang.org/grpc/stats",
+ "google.golang.org/grpc/status",
+ ]
+ solver-name = "gps-cdcl"
+ solver-version = 1
diff --git a/vendor/go.opencensus.io/Gopkg.toml b/vendor/go.opencensus.io/Gopkg.toml
new file mode 100644
index 0000000..a9f3cd6
--- /dev/null
+++ b/vendor/go.opencensus.io/Gopkg.toml
@@ -0,0 +1,36 @@
+# For v0.x.y dependencies, prefer adding a constraints of the form: version=">= 0.x.y"
+# to avoid locking to a particular minor version which can cause dep to not be
+# able to find a satisfying dependency graph.
+
+[[constraint]]
+ branch = "master"
+ name = "git.apache.org/thrift.git"
+ source = "github.com/apache/thrift"
+
+[[constraint]]
+ name = "github.com/golang/protobuf"
+ version = "1.0.0"
+
+[[constraint]]
+ name = "github.com/openzipkin/zipkin-go"
+ version = ">=0.1.0"
+
+[[constraint]]
+ name = "github.com/prometheus/client_golang"
+ version = ">=0.8.0"
+
+[[constraint]]
+ branch = "master"
+ name = "golang.org/x/net"
+
+[[constraint]]
+ branch = "master"
+ name = "google.golang.org/api"
+
+[[constraint]]
+ name = "google.golang.org/grpc"
+ version = "1.11.3"
+
+[prune]
+ go-tests = true
+ unused-packages = true
diff --git a/vendor/go.opencensus.io/LICENSE b/vendor/go.opencensus.io/LICENSE
new file mode 100644
index 0000000..7a4a3ea
--- /dev/null
+++ b/vendor/go.opencensus.io/LICENSE
@@ -0,0 +1,202 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
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+ Licensed under the Apache License, Version 2.0 (the "License");
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diff --git a/vendor/go.opencensus.io/README.md b/vendor/go.opencensus.io/README.md
new file mode 100644
index 0000000..b8a5107
--- /dev/null
+++ b/vendor/go.opencensus.io/README.md
@@ -0,0 +1,263 @@
+# OpenCensus Libraries for Go
+
+[![Build Status][travis-image]][travis-url]
+[![Windows Build Status][appveyor-image]][appveyor-url]
+[![GoDoc][godoc-image]][godoc-url]
+[![Gitter chat][gitter-image]][gitter-url]
+
+OpenCensus Go is a Go implementation of OpenCensus, a toolkit for
+collecting application performance and behavior monitoring data.
+Currently it consists of three major components: tags, stats and tracing.
+
+## Installation
+
+```
+$ go get -u go.opencensus.io
+```
+
+The API of this project is still evolving, see: [Deprecation Policy](#deprecation-policy).
+The use of vendoring or a dependency management tool is recommended.
+
+## Prerequisites
+
+OpenCensus Go libraries require Go 1.8 or later.
+
+## Getting Started
+
+The easiest way to get started using OpenCensus in your application is to use an existing
+integration with your RPC framework:
+
+* [net/http](https://godoc.org/go.opencensus.io/plugin/ochttp)
+* [gRPC](https://godoc.org/go.opencensus.io/plugin/ocgrpc)
+* [database/sql](https://godoc.org/github.com/opencensus-integrations/ocsql)
+* [Go kit](https://godoc.org/github.com/go-kit/kit/tracing/opencensus)
+* [Groupcache](https://godoc.org/github.com/orijtech/groupcache)
+* [Caddy webserver](https://godoc.org/github.com/orijtech/caddy)
+* [MongoDB](https://godoc.org/github.com/orijtech/mongo-go-driver)
+* [Redis gomodule/redigo](https://godoc.org/github.com/orijtech/redigo)
+* [Redis goredis/redis](https://godoc.org/github.com/orijtech/redis)
+* [Memcache](https://godoc.org/github.com/orijtech/gomemcache)
+
+If you're using a framework not listed here, you could either implement your own middleware for your
+framework or use [custom stats](#stats) and [spans](#spans) directly in your application.
+
+## Exporters
+
+OpenCensus can export instrumentation data to various backends.
+OpenCensus has exporter implementations for the following, users
+can implement their own exporters by implementing the exporter interfaces
+([stats](https://godoc.org/go.opencensus.io/stats/view#Exporter),
+[trace](https://godoc.org/go.opencensus.io/trace#Exporter)):
+
+* [Prometheus][exporter-prom] for stats
+* [OpenZipkin][exporter-zipkin] for traces
+* [Stackdriver][exporter-stackdriver] Monitoring for stats and Trace for traces
+* [Jaeger][exporter-jaeger] for traces
+* [AWS X-Ray][exporter-xray] for traces
+* [Datadog][exporter-datadog] for stats and traces
+* [Graphite][exporter-graphite] for stats
+* [Honeycomb][exporter-honeycomb] for traces
+
+## Overview
+
+
+
+In a microservices environment, a user request may go through
+multiple services until there is a response. OpenCensus allows
+you to instrument your services and collect diagnostics data all
+through your services end-to-end.
+
+## Tags
+
+Tags represent propagated key-value pairs. They are propagated using `context.Context`
+in the same process or can be encoded to be transmitted on the wire. Usually, this will
+be handled by an integration plugin, e.g. `ocgrpc.ServerHandler` and `ocgrpc.ClientHandler`
+for gRPC.
+
+Package `tag` allows adding or modifying tags in the current context.
+
+[embedmd]:# (internal/readme/tags.go new)
+```go
+ctx, err = tag.New(ctx,
+ tag.Insert(osKey, "macOS-10.12.5"),
+ tag.Upsert(userIDKey, "cde36753ed"),
+)
+if err != nil {
+ log.Fatal(err)
+}
+```
+
+## Stats
+
+OpenCensus is a low-overhead framework even if instrumentation is always enabled.
+In order to be so, it is optimized to make recording of data points fast
+and separate from the data aggregation.
+
+OpenCensus stats collection happens in two stages:
+
+* Definition of measures and recording of data points
+* Definition of views and aggregation of the recorded data
+
+### Recording
+
+Measurements are data points associated with a measure.
+Recording implicitly tags the set of Measurements with the tags from the
+provided context:
+
+[embedmd]:# (internal/readme/stats.go record)
+```go
+stats.Record(ctx, videoSize.M(102478))
+```
+
+### Views
+
+Views are how Measures are aggregated. You can think of them as queries over the
+set of recorded data points (measurements).
+
+Views have two parts: the tags to group by and the aggregation type used.
+
+Currently three types of aggregations are supported:
+* CountAggregation is used to count the number of times a sample was recorded.
+* DistributionAggregation is used to provide a histogram of the values of the samples.
+* SumAggregation is used to sum up all sample values.
+
+[embedmd]:# (internal/readme/stats.go aggs)
+```go
+distAgg := view.Distribution(0, 1<<32, 2<<32, 3<<32)
+countAgg := view.Count()
+sumAgg := view.Sum()
+```
+
+Here we create a view with the DistributionAggregation over our measure.
+
+[embedmd]:# (internal/readme/stats.go view)
+```go
+if err := view.Register(&view.View{
+ Name: "example.com/video_size_distribution",
+ Description: "distribution of processed video size over time",
+ Measure: videoSize,
+ Aggregation: view.Distribution(0, 1<<32, 2<<32, 3<<32),
+}); err != nil {
+ log.Fatalf("Failed to register view: %v", err)
+}
+```
+
+Register begins collecting data for the view. Registered views' data will be
+exported via the registered exporters.
+
+## Traces
+
+A distributed trace tracks the progression of a single user request as
+it is handled by the services and processes that make up an application.
+Each step is called a span in the trace. Spans include metadata about the step,
+including especially the time spent in the step, called the span’s latency.
+
+Below you see a trace and several spans underneath it.
+
+
+
+### Spans
+
+Span is the unit step in a trace. Each span has a name, latency, status and
+additional metadata.
+
+Below we are starting a span for a cache read and ending it
+when we are done:
+
+[embedmd]:# (internal/readme/trace.go startend)
+```go
+ctx, span := trace.StartSpan(ctx, "cache.Get")
+defer span.End()
+
+// Do work to get from cache.
+```
+
+### Propagation
+
+Spans can have parents or can be root spans if they don't have any parents.
+The current span is propagated in-process and across the network to allow associating
+new child spans with the parent.
+
+In the same process, `context.Context` is used to propagate spans.
+`trace.StartSpan` creates a new span as a root if the current context
+doesn't contain a span. Or, it creates a child of the span that is
+already in current context. The returned context can be used to keep
+propagating the newly created span in the current context.
+
+[embedmd]:# (internal/readme/trace.go startend)
+```go
+ctx, span := trace.StartSpan(ctx, "cache.Get")
+defer span.End()
+
+// Do work to get from cache.
+```
+
+Across the network, OpenCensus provides different propagation
+methods for different protocols.
+
+* gRPC integrations use the OpenCensus' [binary propagation format](https://godoc.org/go.opencensus.io/trace/propagation).
+* HTTP integrations use Zipkin's [B3](https://github.com/openzipkin/b3-propagation)
+ by default but can be configured to use a custom propagation method by setting another
+ [propagation.HTTPFormat](https://godoc.org/go.opencensus.io/trace/propagation#HTTPFormat).
+
+## Execution Tracer
+
+With Go 1.11, OpenCensus Go will support integration with the Go execution tracer.
+See [Debugging Latency in Go](https://medium.com/observability/debugging-latency-in-go-1-11-9f97a7910d68)
+for an example of their mutual use.
+
+## Profiles
+
+OpenCensus tags can be applied as profiler labels
+for users who are on Go 1.9 and above.
+
+[embedmd]:# (internal/readme/tags.go profiler)
+```go
+ctx, err = tag.New(ctx,
+ tag.Insert(osKey, "macOS-10.12.5"),
+ tag.Insert(userIDKey, "fff0989878"),
+)
+if err != nil {
+ log.Fatal(err)
+}
+tag.Do(ctx, func(ctx context.Context) {
+ // Do work.
+ // When profiling is on, samples will be
+ // recorded with the key/values from the tag map.
+})
+```
+
+A screenshot of the CPU profile from the program above:
+
+
+
+## Deprecation Policy
+
+Before version 1.0.0, the following deprecation policy will be observed:
+
+No backwards-incompatible changes will be made except for the removal of symbols that have
+been marked as *Deprecated* for at least one minor release (e.g. 0.9.0 to 0.10.0). A release
+removing the *Deprecated* functionality will be made no sooner than 28 days after the first
+release in which the functionality was marked *Deprecated*.
+
+[travis-image]: https://travis-ci.org/census-instrumentation/opencensus-go.svg?branch=master
+[travis-url]: https://travis-ci.org/census-instrumentation/opencensus-go
+[appveyor-image]: https://ci.appveyor.com/api/projects/status/vgtt29ps1783ig38?svg=true
+[appveyor-url]: https://ci.appveyor.com/project/opencensusgoteam/opencensus-go/branch/master
+[godoc-image]: https://godoc.org/go.opencensus.io?status.svg
+[godoc-url]: https://godoc.org/go.opencensus.io
+[gitter-image]: https://badges.gitter.im/census-instrumentation/lobby.svg
+[gitter-url]: https://gitter.im/census-instrumentation/lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
+
+
+[new-ex]: https://godoc.org/go.opencensus.io/tag#example-NewMap
+[new-replace-ex]: https://godoc.org/go.opencensus.io/tag#example-NewMap--Replace
+
+[exporter-prom]: https://godoc.org/go.opencensus.io/exporter/prometheus
+[exporter-stackdriver]: https://godoc.org/contrib.go.opencensus.io/exporter/stackdriver
+[exporter-zipkin]: https://godoc.org/go.opencensus.io/exporter/zipkin
+[exporter-jaeger]: https://godoc.org/go.opencensus.io/exporter/jaeger
+[exporter-xray]: https://github.com/census-ecosystem/opencensus-go-exporter-aws
+[exporter-datadog]: https://github.com/DataDog/opencensus-go-exporter-datadog
+[exporter-graphite]: https://github.com/census-ecosystem/opencensus-go-exporter-graphite
+[exporter-honeycomb]: https://github.com/honeycombio/opencensus-exporter
diff --git a/vendor/go.opencensus.io/appveyor.yml b/vendor/go.opencensus.io/appveyor.yml
new file mode 100644
index 0000000..9805788
--- /dev/null
+++ b/vendor/go.opencensus.io/appveyor.yml
@@ -0,0 +1,24 @@
+version: "{build}"
+
+platform: x64
+
+clone_folder: c:\gopath\src\go.opencensus.io
+
+environment:
+ GOPATH: 'c:\gopath'
+ GOVERSION: '1.11'
+ GO111MODULE: 'on'
+ CGO_ENABLED: '0' # See: https://github.com/appveyor/ci/issues/2613
+
+install:
+ - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+ - go version
+ - go env
+
+build: false
+deploy: false
+
+test_script:
+ - cd %APPVEYOR_BUILD_FOLDER%
+ - go build -v .\...
+ - go test -v .\... # No -race because cgo is disabled
diff --git a/vendor/go.opencensus.io/exemplar/exemplar.go b/vendor/go.opencensus.io/exemplar/exemplar.go
new file mode 100644
index 0000000..e676df8
--- /dev/null
+++ b/vendor/go.opencensus.io/exemplar/exemplar.go
@@ -0,0 +1,78 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package exemplar implements support for exemplars. Exemplars are additional
+// data associated with each measurement.
+//
+// Their purpose it to provide an example of the kind of thing
+// (request, RPC, trace span, etc.) that resulted in that measurement.
+package exemplar
+
+import (
+ "context"
+ "time"
+)
+
+const (
+ KeyTraceID = "trace_id"
+ KeySpanID = "span_id"
+ KeyPrefixTag = "tag:"
+)
+
+// Exemplar is an example data point associated with each bucket of a
+// distribution type aggregation.
+type Exemplar struct {
+ Value float64 // the value that was recorded
+ Timestamp time.Time // the time the value was recorded
+ Attachments Attachments // attachments (if any)
+}
+
+// Attachments is a map of extra values associated with a recorded data point.
+// The map should only be mutated from AttachmentExtractor functions.
+type Attachments map[string]string
+
+// AttachmentExtractor is a function capable of extracting exemplar attachments
+// from the context used to record measurements.
+// The map passed to the function should be mutated and returned. It will
+// initially be nil: the first AttachmentExtractor that would like to add keys to the
+// map is responsible for initializing it.
+type AttachmentExtractor func(ctx context.Context, a Attachments) Attachments
+
+var extractors []AttachmentExtractor
+
+// RegisterAttachmentExtractor registers the given extractor associated with the exemplar
+// type name.
+//
+// Extractors will be used to attempt to extract exemplars from the context
+// associated with each recorded measurement.
+//
+// Packages that support exemplars should register their extractor functions on
+// initialization.
+//
+// RegisterAttachmentExtractor should not be called after any measurements have
+// been recorded.
+func RegisterAttachmentExtractor(e AttachmentExtractor) {
+ extractors = append(extractors, e)
+}
+
+// NewFromContext extracts exemplars from the given context.
+// Each registered AttachmentExtractor (see RegisterAttachmentExtractor) is called in an
+// unspecified order to add attachments to the exemplar.
+func AttachmentsFromContext(ctx context.Context) Attachments {
+ var a Attachments
+ for _, extractor := range extractors {
+ a = extractor(ctx, a)
+ }
+ return a
+}
diff --git a/vendor/go.opencensus.io/exporter/zipkin/zipkin.go b/vendor/go.opencensus.io/exporter/zipkin/zipkin.go
new file mode 100644
index 0000000..30d2fa4
--- /dev/null
+++ b/vendor/go.opencensus.io/exporter/zipkin/zipkin.go
@@ -0,0 +1,194 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package zipkin contains an trace exporter for Zipkin.
+package zipkin // import "go.opencensus.io/exporter/zipkin"
+
+import (
+ "encoding/binary"
+ "strconv"
+
+ "github.com/openzipkin/zipkin-go/model"
+ "github.com/openzipkin/zipkin-go/reporter"
+ "go.opencensus.io/trace"
+)
+
+// Exporter is an implementation of trace.Exporter that uploads spans to a
+// Zipkin server.
+type Exporter struct {
+ reporter reporter.Reporter
+ localEndpoint *model.Endpoint
+}
+
+// NewExporter returns an implementation of trace.Exporter that uploads spans
+// to a Zipkin server.
+//
+// reporter is a Zipkin Reporter which will be used to send the spans. These
+// can be created with the openzipkin library, using one of the packages under
+// github.com/openzipkin/zipkin-go/reporter.
+//
+// localEndpoint sets the local endpoint of exported spans. It can be
+// constructed with github.com/openzipkin/zipkin-go.NewEndpoint, e.g.:
+// localEndpoint, err := NewEndpoint("my server", listener.Addr().String())
+// localEndpoint can be nil.
+func NewExporter(reporter reporter.Reporter, localEndpoint *model.Endpoint) *Exporter {
+ return &Exporter{
+ reporter: reporter,
+ localEndpoint: localEndpoint,
+ }
+}
+
+// ExportSpan exports a span to a Zipkin server.
+func (e *Exporter) ExportSpan(s *trace.SpanData) {
+ e.reporter.Send(zipkinSpan(s, e.localEndpoint))
+}
+
+const (
+ statusCodeTagKey = "error"
+ statusDescriptionTagKey = "opencensus.status_description"
+)
+
+var (
+ sampledTrue = true
+ canonicalCodes = [...]string{
+ "OK",
+ "CANCELLED",
+ "UNKNOWN",
+ "INVALID_ARGUMENT",
+ "DEADLINE_EXCEEDED",
+ "NOT_FOUND",
+ "ALREADY_EXISTS",
+ "PERMISSION_DENIED",
+ "RESOURCE_EXHAUSTED",
+ "FAILED_PRECONDITION",
+ "ABORTED",
+ "OUT_OF_RANGE",
+ "UNIMPLEMENTED",
+ "INTERNAL",
+ "UNAVAILABLE",
+ "DATA_LOSS",
+ "UNAUTHENTICATED",
+ }
+)
+
+func canonicalCodeString(code int32) string {
+ if code < 0 || int(code) >= len(canonicalCodes) {
+ return "error code " + strconv.FormatInt(int64(code), 10)
+ }
+ return canonicalCodes[code]
+}
+
+func convertTraceID(t trace.TraceID) model.TraceID {
+ return model.TraceID{
+ High: binary.BigEndian.Uint64(t[:8]),
+ Low: binary.BigEndian.Uint64(t[8:]),
+ }
+}
+
+func convertSpanID(s trace.SpanID) model.ID {
+ return model.ID(binary.BigEndian.Uint64(s[:]))
+}
+
+func spanKind(s *trace.SpanData) model.Kind {
+ switch s.SpanKind {
+ case trace.SpanKindClient:
+ return model.Client
+ case trace.SpanKindServer:
+ return model.Server
+ }
+ return model.Undetermined
+}
+
+func zipkinSpan(s *trace.SpanData, localEndpoint *model.Endpoint) model.SpanModel {
+ sc := s.SpanContext
+ z := model.SpanModel{
+ SpanContext: model.SpanContext{
+ TraceID: convertTraceID(sc.TraceID),
+ ID: convertSpanID(sc.SpanID),
+ Sampled: &sampledTrue,
+ },
+ Kind: spanKind(s),
+ Name: s.Name,
+ Timestamp: s.StartTime,
+ Shared: false,
+ LocalEndpoint: localEndpoint,
+ }
+
+ if s.ParentSpanID != (trace.SpanID{}) {
+ id := convertSpanID(s.ParentSpanID)
+ z.ParentID = &id
+ }
+
+ if s, e := s.StartTime, s.EndTime; !s.IsZero() && !e.IsZero() {
+ z.Duration = e.Sub(s)
+ }
+
+ // construct Tags from s.Attributes and s.Status.
+ if len(s.Attributes) != 0 {
+ m := make(map[string]string, len(s.Attributes)+2)
+ for key, value := range s.Attributes {
+ switch v := value.(type) {
+ case string:
+ m[key] = v
+ case bool:
+ if v {
+ m[key] = "true"
+ } else {
+ m[key] = "false"
+ }
+ case int64:
+ m[key] = strconv.FormatInt(v, 10)
+ }
+ }
+ z.Tags = m
+ }
+ if s.Status.Code != 0 || s.Status.Message != "" {
+ if z.Tags == nil {
+ z.Tags = make(map[string]string, 2)
+ }
+ if s.Status.Code != 0 {
+ z.Tags[statusCodeTagKey] = canonicalCodeString(s.Status.Code)
+ }
+ if s.Status.Message != "" {
+ z.Tags[statusDescriptionTagKey] = s.Status.Message
+ }
+ }
+
+ // construct Annotations from s.Annotations and s.MessageEvents.
+ if len(s.Annotations) != 0 || len(s.MessageEvents) != 0 {
+ z.Annotations = make([]model.Annotation, 0, len(s.Annotations)+len(s.MessageEvents))
+ for _, a := range s.Annotations {
+ z.Annotations = append(z.Annotations, model.Annotation{
+ Timestamp: a.Time,
+ Value: a.Message,
+ })
+ }
+ for _, m := range s.MessageEvents {
+ a := model.Annotation{
+ Timestamp: m.Time,
+ }
+ switch m.EventType {
+ case trace.MessageEventTypeSent:
+ a.Value = "SENT"
+ case trace.MessageEventTypeRecv:
+ a.Value = "RECV"
+ default:
+ a.Value = "<?>"
+ }
+ z.Annotations = append(z.Annotations, a)
+ }
+ }
+
+ return z
+}
diff --git a/vendor/go.opencensus.io/go.mod b/vendor/go.opencensus.io/go.mod
new file mode 100644
index 0000000..1236f4c
--- /dev/null
+++ b/vendor/go.opencensus.io/go.mod
@@ -0,0 +1,25 @@
+module go.opencensus.io
+
+require (
+ git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999
+ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973
+ github.com/ghodss/yaml v1.0.0 // indirect
+ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b // indirect
+ github.com/golang/protobuf v1.2.0
+ github.com/google/go-cmp v0.2.0
+ github.com/grpc-ecosystem/grpc-gateway v1.5.0 // indirect
+ github.com/matttproud/golang_protobuf_extensions v1.0.1
+ github.com/openzipkin/zipkin-go v0.1.1
+ github.com/prometheus/client_golang v0.8.0
+ github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910
+ github.com/prometheus/common v0.0.0-20180801064454-c7de2306084e
+ github.com/prometheus/procfs v0.0.0-20180725123919-05ee40e3a273
+ golang.org/x/net v0.0.0-20180906233101-161cd47e91fd
+ golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f
+ golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e
+ golang.org/x/text v0.3.0
+ google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf
+ google.golang.org/genproto v0.0.0-20180831171423-11092d34479b
+ google.golang.org/grpc v1.14.0
+ gopkg.in/yaml.v2 v2.2.1 // indirect
+)
diff --git a/vendor/go.opencensus.io/go.sum b/vendor/go.opencensus.io/go.sum
new file mode 100644
index 0000000..3e0bab8
--- /dev/null
+++ b/vendor/go.opencensus.io/go.sum
@@ -0,0 +1,48 @@
+git.apache.org/thrift.git v0.0.0-20180807212849-6e67faa92827/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
+git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999 h1:sihTnRgTOUSCQz0iS0pjZuFQy/z7GXCJgSBg3+rZKHw=
+git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/ghodss/yaml v1.0.0 h1:wQHKEahhL6wmXdzwWG11gIVCkOv05bNOh+Rxn0yngAk=
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/grpc-ecosystem/grpc-gateway v1.5.0 h1:WcmKMm43DR7RdtlkEXQJyo5ws8iTp98CyhCCbOHMvNI=
+github.com/grpc-ecosystem/grpc-gateway v1.5.0/go.mod h1:RSKVYQBd5MCa4OVpNdGskqpgL2+G+NZTnrVHpWWfpdw=
+github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
+github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
+github.com/openzipkin/zipkin-go v0.1.1 h1:A/ADD6HaPnAKj3yS7HjGHRK77qi41Hi0DirOOIQAeIw=
+github.com/openzipkin/zipkin-go v0.1.1/go.mod h1:NtoC/o8u3JlF1lSlyPNswIbeQH9bJTmOf0Erfk+hxe8=
+github.com/prometheus/client_golang v0.8.0 h1:1921Yw9Gc3iSc4VQh3PIoOqgPCZS7G/4xQNVUp8Mda8=
+github.com/prometheus/client_golang v0.8.0/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
+github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 h1:idejC8f05m9MGOsuEi1ATq9shN03HrxNkD/luQvxCv8=
+github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
+github.com/prometheus/common v0.0.0-20180801064454-c7de2306084e h1:n/3MEhJQjQxrOUCzh1Y3Re6aJUUWRp2M9+Oc3eVn/54=
+github.com/prometheus/common v0.0.0-20180801064454-c7de2306084e/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
+github.com/prometheus/procfs v0.0.0-20180725123919-05ee40e3a273 h1:agujYaXJSxSo18YNX3jzl+4G6Bstwt+kqv47GS12uL0=
+github.com/prometheus/procfs v0.0.0-20180725123919-05ee40e3a273/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+golang.org/x/net v0.0.0-20180821023952-922f4815f713/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd h1:nTDtHvHSdCn1m6ITfMRqtOd/9+7a3s8RBNOZ3eYZzJA=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180821140842-3b58ed4ad339/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e h1:o3PsSEY8E4eXWkXrIP9YJALUkVZqzHJT5DOasTyn8Vs=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+google.golang.org/api v0.0.0-20180818000503-e21acd801f91/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
+google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf h1:rjxqQmxjyqerRKEj+tZW+MCm4LgpFXu18bsEoCMgDsk=
+google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20180831171423-11092d34479b h1:lohp5blsw53GBXtLyLNaTXPXS9pJ1tiTw61ZHUoE9Qw=
+google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/grpc v1.14.0 h1:ArxJuB1NWfPY6r9Gp9gqwplT0Ge7nqv9msgu03lHLmo=
+google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/vendor/go.opencensus.io/internal/internal.go b/vendor/go.opencensus.io/internal/internal.go
new file mode 100644
index 0000000..e1d1238
--- /dev/null
+++ b/vendor/go.opencensus.io/internal/internal.go
@@ -0,0 +1,37 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal // import "go.opencensus.io/internal"
+
+import (
+ "fmt"
+ "time"
+
+ "go.opencensus.io"
+)
+
+// UserAgent is the user agent to be added to the outgoing
+// requests from the exporters.
+var UserAgent = fmt.Sprintf("opencensus-go [%s]", opencensus.Version())
+
+// MonotonicEndTime returns the end time at present
+// but offset from start, monotonically.
+//
+// The monotonic clock is used in subtractions hence
+// the duration since start added back to start gives
+// end as a monotonic time.
+// See https://golang.org/pkg/time/#hdr-Monotonic_Clocks
+func MonotonicEndTime(start time.Time) time.Time {
+ return start.Add(time.Now().Sub(start))
+}
diff --git a/vendor/go.opencensus.io/internal/sanitize.go b/vendor/go.opencensus.io/internal/sanitize.go
new file mode 100644
index 0000000..de8ccf2
--- /dev/null
+++ b/vendor/go.opencensus.io/internal/sanitize.go
@@ -0,0 +1,50 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import (
+ "strings"
+ "unicode"
+)
+
+const labelKeySizeLimit = 100
+
+// Sanitize returns a string that is trunacated to 100 characters if it's too
+// long, and replaces non-alphanumeric characters to underscores.
+func Sanitize(s string) string {
+ if len(s) == 0 {
+ return s
+ }
+ if len(s) > labelKeySizeLimit {
+ s = s[:labelKeySizeLimit]
+ }
+ s = strings.Map(sanitizeRune, s)
+ if unicode.IsDigit(rune(s[0])) {
+ s = "key_" + s
+ }
+ if s[0] == '_' {
+ s = "key" + s
+ }
+ return s
+}
+
+// converts anything that is not a letter or digit to an underscore
+func sanitizeRune(r rune) rune {
+ if unicode.IsLetter(r) || unicode.IsDigit(r) {
+ return r
+ }
+ // Everything else turns into an underscore
+ return '_'
+}
diff --git a/vendor/go.opencensus.io/internal/tagencoding/tagencoding.go b/vendor/go.opencensus.io/internal/tagencoding/tagencoding.go
new file mode 100644
index 0000000..3b1af8b
--- /dev/null
+++ b/vendor/go.opencensus.io/internal/tagencoding/tagencoding.go
@@ -0,0 +1,72 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Package tagencoding contains the tag encoding
+// used interally by the stats collector.
+package tagencoding // import "go.opencensus.io/internal/tagencoding"
+
+type Values struct {
+ Buffer []byte
+ WriteIndex int
+ ReadIndex int
+}
+
+func (vb *Values) growIfRequired(expected int) {
+ if len(vb.Buffer)-vb.WriteIndex < expected {
+ tmp := make([]byte, 2*(len(vb.Buffer)+1)+expected)
+ copy(tmp, vb.Buffer)
+ vb.Buffer = tmp
+ }
+}
+
+func (vb *Values) WriteValue(v []byte) {
+ length := len(v) & 0xff
+ vb.growIfRequired(1 + length)
+
+ // writing length of v
+ vb.Buffer[vb.WriteIndex] = byte(length)
+ vb.WriteIndex++
+
+ if length == 0 {
+ // No value was encoded for this key
+ return
+ }
+
+ // writing v
+ copy(vb.Buffer[vb.WriteIndex:], v[:length])
+ vb.WriteIndex += length
+}
+
+// ReadValue is the helper method to read the values when decoding valuesBytes to a map[Key][]byte.
+func (vb *Values) ReadValue() []byte {
+ // read length of v
+ length := int(vb.Buffer[vb.ReadIndex])
+ vb.ReadIndex++
+ if length == 0 {
+ // No value was encoded for this key
+ return nil
+ }
+
+ // read value of v
+ v := make([]byte, length)
+ endIdx := vb.ReadIndex + length
+ copy(v, vb.Buffer[vb.ReadIndex:endIdx])
+ vb.ReadIndex = endIdx
+ return v
+}
+
+func (vb *Values) Bytes() []byte {
+ return vb.Buffer[:vb.WriteIndex]
+}
diff --git a/vendor/go.opencensus.io/internal/traceinternals.go b/vendor/go.opencensus.io/internal/traceinternals.go
new file mode 100644
index 0000000..553ca68
--- /dev/null
+++ b/vendor/go.opencensus.io/internal/traceinternals.go
@@ -0,0 +1,52 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import (
+ "time"
+)
+
+// Trace allows internal access to some trace functionality.
+// TODO(#412): remove this
+var Trace interface{}
+
+var LocalSpanStoreEnabled bool
+
+// BucketConfiguration stores the number of samples to store for span buckets
+// for successful and failed spans for a particular span name.
+type BucketConfiguration struct {
+ Name string
+ MaxRequestsSucceeded int
+ MaxRequestsErrors int
+}
+
+// PerMethodSummary is a summary of the spans stored for a single span name.
+type PerMethodSummary struct {
+ Active int
+ LatencyBuckets []LatencyBucketSummary
+ ErrorBuckets []ErrorBucketSummary
+}
+
+// LatencyBucketSummary is a summary of a latency bucket.
+type LatencyBucketSummary struct {
+ MinLatency, MaxLatency time.Duration
+ Size int
+}
+
+// ErrorBucketSummary is a summary of an error bucket.
+type ErrorBucketSummary struct {
+ ErrorCode int32
+ Size int
+}
diff --git a/vendor/go.opencensus.io/opencensus.go b/vendor/go.opencensus.io/opencensus.go
new file mode 100644
index 0000000..7faf9e8
--- /dev/null
+++ b/vendor/go.opencensus.io/opencensus.go
@@ -0,0 +1,21 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package opencensus contains Go support for OpenCensus.
+package opencensus // import "go.opencensus.io"
+
+// Version is the current release version of OpenCensus in use.
+func Version() string {
+ return "0.19.0"
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/client.go b/vendor/go.opencensus.io/plugin/ochttp/client.go
new file mode 100644
index 0000000..da815b2
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/client.go
@@ -0,0 +1,117 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ochttp
+
+import (
+ "net/http"
+ "net/http/httptrace"
+
+ "go.opencensus.io/trace"
+ "go.opencensus.io/trace/propagation"
+)
+
+// Transport is an http.RoundTripper that instruments all outgoing requests with
+// OpenCensus stats and tracing.
+//
+// The zero value is intended to be a useful default, but for
+// now it's recommended that you explicitly set Propagation, since the default
+// for this may change.
+type Transport struct {
+ // Base may be set to wrap another http.RoundTripper that does the actual
+ // requests. By default http.DefaultTransport is used.
+ //
+ // If base HTTP roundtripper implements CancelRequest,
+ // the returned round tripper will be cancelable.
+ Base http.RoundTripper
+
+ // Propagation defines how traces are propagated. If unspecified, a default
+ // (currently B3 format) will be used.
+ Propagation propagation.HTTPFormat
+
+ // StartOptions are applied to the span started by this Transport around each
+ // request.
+ //
+ // StartOptions.SpanKind will always be set to trace.SpanKindClient
+ // for spans started by this transport.
+ StartOptions trace.StartOptions
+
+ // GetStartOptions allows to set start options per request. If set,
+ // StartOptions is going to be ignored.
+ GetStartOptions func(*http.Request) trace.StartOptions
+
+ // NameFromRequest holds the function to use for generating the span name
+ // from the information found in the outgoing HTTP Request. By default the
+ // name equals the URL Path.
+ FormatSpanName func(*http.Request) string
+
+ // NewClientTrace may be set to a function allowing the current *trace.Span
+ // to be annotated with HTTP request event information emitted by the
+ // httptrace package.
+ NewClientTrace func(*http.Request, *trace.Span) *httptrace.ClientTrace
+
+ // TODO: Implement tag propagation for HTTP.
+}
+
+// RoundTrip implements http.RoundTripper, delegating to Base and recording stats and traces for the request.
+func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
+ rt := t.base()
+ if isHealthEndpoint(req.URL.Path) {
+ return rt.RoundTrip(req)
+ }
+ // TODO: remove excessive nesting of http.RoundTrippers here.
+ format := t.Propagation
+ if format == nil {
+ format = defaultFormat
+ }
+ spanNameFormatter := t.FormatSpanName
+ if spanNameFormatter == nil {
+ spanNameFormatter = spanNameFromURL
+ }
+
+ startOpts := t.StartOptions
+ if t.GetStartOptions != nil {
+ startOpts = t.GetStartOptions(req)
+ }
+
+ rt = &traceTransport{
+ base: rt,
+ format: format,
+ startOptions: trace.StartOptions{
+ Sampler: startOpts.Sampler,
+ SpanKind: trace.SpanKindClient,
+ },
+ formatSpanName: spanNameFormatter,
+ newClientTrace: t.NewClientTrace,
+ }
+ rt = statsTransport{base: rt}
+ return rt.RoundTrip(req)
+}
+
+func (t *Transport) base() http.RoundTripper {
+ if t.Base != nil {
+ return t.Base
+ }
+ return http.DefaultTransport
+}
+
+// CancelRequest cancels an in-flight request by closing its connection.
+func (t *Transport) CancelRequest(req *http.Request) {
+ type canceler interface {
+ CancelRequest(*http.Request)
+ }
+ if cr, ok := t.base().(canceler); ok {
+ cr.CancelRequest(req)
+ }
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/client_stats.go b/vendor/go.opencensus.io/plugin/ochttp/client_stats.go
new file mode 100644
index 0000000..066ebb8
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/client_stats.go
@@ -0,0 +1,135 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ochttp
+
+import (
+ "context"
+ "io"
+ "net/http"
+ "strconv"
+ "sync"
+ "time"
+
+ "go.opencensus.io/stats"
+ "go.opencensus.io/tag"
+)
+
+// statsTransport is an http.RoundTripper that collects stats for the outgoing requests.
+type statsTransport struct {
+ base http.RoundTripper
+}
+
+// RoundTrip implements http.RoundTripper, delegating to Base and recording stats for the request.
+func (t statsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+ ctx, _ := tag.New(req.Context(),
+ tag.Upsert(KeyClientHost, req.URL.Host),
+ tag.Upsert(Host, req.URL.Host),
+ tag.Upsert(KeyClientPath, req.URL.Path),
+ tag.Upsert(Path, req.URL.Path),
+ tag.Upsert(KeyClientMethod, req.Method),
+ tag.Upsert(Method, req.Method))
+ req = req.WithContext(ctx)
+ track := &tracker{
+ start: time.Now(),
+ ctx: ctx,
+ }
+ if req.Body == nil {
+ // TODO: Handle cases where ContentLength is not set.
+ track.reqSize = -1
+ } else if req.ContentLength > 0 {
+ track.reqSize = req.ContentLength
+ }
+ stats.Record(ctx, ClientRequestCount.M(1))
+
+ // Perform request.
+ resp, err := t.base.RoundTrip(req)
+
+ if err != nil {
+ track.statusCode = http.StatusInternalServerError
+ track.end()
+ } else {
+ track.statusCode = resp.StatusCode
+ if resp.Body == nil {
+ track.end()
+ } else {
+ track.body = resp.Body
+ resp.Body = track
+ }
+ }
+ return resp, err
+}
+
+// CancelRequest cancels an in-flight request by closing its connection.
+func (t statsTransport) CancelRequest(req *http.Request) {
+ type canceler interface {
+ CancelRequest(*http.Request)
+ }
+ if cr, ok := t.base.(canceler); ok {
+ cr.CancelRequest(req)
+ }
+}
+
+type tracker struct {
+ ctx context.Context
+ respSize int64
+ reqSize int64
+ start time.Time
+ body io.ReadCloser
+ statusCode int
+ endOnce sync.Once
+}
+
+var _ io.ReadCloser = (*tracker)(nil)
+
+func (t *tracker) end() {
+ t.endOnce.Do(func() {
+ latencyMs := float64(time.Since(t.start)) / float64(time.Millisecond)
+ m := []stats.Measurement{
+ ClientSentBytes.M(t.reqSize),
+ ClientReceivedBytes.M(t.respSize),
+ ClientRoundtripLatency.M(latencyMs),
+ ClientLatency.M(latencyMs),
+ ClientResponseBytes.M(t.respSize),
+ }
+ if t.reqSize >= 0 {
+ m = append(m, ClientRequestBytes.M(t.reqSize))
+ }
+
+ stats.RecordWithTags(t.ctx, []tag.Mutator{
+ tag.Upsert(StatusCode, strconv.Itoa(t.statusCode)),
+ tag.Upsert(KeyClientStatus, strconv.Itoa(t.statusCode)),
+ }, m...)
+ })
+}
+
+func (t *tracker) Read(b []byte) (int, error) {
+ n, err := t.body.Read(b)
+ switch err {
+ case nil:
+ t.respSize += int64(n)
+ return n, nil
+ case io.EOF:
+ t.end()
+ }
+ return n, err
+}
+
+func (t *tracker) Close() error {
+ // Invoking endSpan on Close will help catch the cases
+ // in which a read returned a non-nil error, we set the
+ // span status but didn't end the span.
+ t.end()
+ return t.body.Close()
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/doc.go b/vendor/go.opencensus.io/plugin/ochttp/doc.go
new file mode 100644
index 0000000..10e626b
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/doc.go
@@ -0,0 +1,19 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package ochttp provides OpenCensus instrumentation for net/http package.
+//
+// For server instrumentation, see Handler. For client-side instrumentation,
+// see Transport.
+package ochttp // import "go.opencensus.io/plugin/ochttp"
diff --git a/vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go b/vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go
new file mode 100644
index 0000000..f777772
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go
@@ -0,0 +1,123 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package b3 contains a propagation.HTTPFormat implementation
+// for B3 propagation. See https://github.com/openzipkin/b3-propagation
+// for more details.
+package b3 // import "go.opencensus.io/plugin/ochttp/propagation/b3"
+
+import (
+ "encoding/hex"
+ "net/http"
+
+ "go.opencensus.io/trace"
+ "go.opencensus.io/trace/propagation"
+)
+
+// B3 headers that OpenCensus understands.
+const (
+ TraceIDHeader = "X-B3-TraceId"
+ SpanIDHeader = "X-B3-SpanId"
+ SampledHeader = "X-B3-Sampled"
+)
+
+// HTTPFormat implements propagation.HTTPFormat to propagate
+// traces in HTTP headers in B3 propagation format.
+// HTTPFormat skips the X-B3-ParentId and X-B3-Flags headers
+// because there are additional fields not represented in the
+// OpenCensus span context. Spans created from the incoming
+// header will be the direct children of the client-side span.
+// Similarly, reciever of the outgoing spans should use client-side
+// span created by OpenCensus as the parent.
+type HTTPFormat struct{}
+
+var _ propagation.HTTPFormat = (*HTTPFormat)(nil)
+
+// SpanContextFromRequest extracts a B3 span context from incoming requests.
+func (f *HTTPFormat) SpanContextFromRequest(req *http.Request) (sc trace.SpanContext, ok bool) {
+ tid, ok := ParseTraceID(req.Header.Get(TraceIDHeader))
+ if !ok {
+ return trace.SpanContext{}, false
+ }
+ sid, ok := ParseSpanID(req.Header.Get(SpanIDHeader))
+ if !ok {
+ return trace.SpanContext{}, false
+ }
+ sampled, _ := ParseSampled(req.Header.Get(SampledHeader))
+ return trace.SpanContext{
+ TraceID: tid,
+ SpanID: sid,
+ TraceOptions: sampled,
+ }, true
+}
+
+// ParseTraceID parses the value of the X-B3-TraceId header.
+func ParseTraceID(tid string) (trace.TraceID, bool) {
+ if tid == "" {
+ return trace.TraceID{}, false
+ }
+ b, err := hex.DecodeString(tid)
+ if err != nil {
+ return trace.TraceID{}, false
+ }
+ var traceID trace.TraceID
+ if len(b) <= 8 {
+ // The lower 64-bits.
+ start := 8 + (8 - len(b))
+ copy(traceID[start:], b)
+ } else {
+ start := 16 - len(b)
+ copy(traceID[start:], b)
+ }
+
+ return traceID, true
+}
+
+// ParseSpanID parses the value of the X-B3-SpanId or X-B3-ParentSpanId headers.
+func ParseSpanID(sid string) (spanID trace.SpanID, ok bool) {
+ if sid == "" {
+ return trace.SpanID{}, false
+ }
+ b, err := hex.DecodeString(sid)
+ if err != nil {
+ return trace.SpanID{}, false
+ }
+ start := 8 - len(b)
+ copy(spanID[start:], b)
+ return spanID, true
+}
+
+// ParseSampled parses the value of the X-B3-Sampled header.
+func ParseSampled(sampled string) (trace.TraceOptions, bool) {
+ switch sampled {
+ case "true", "1":
+ return trace.TraceOptions(1), true
+ default:
+ return trace.TraceOptions(0), false
+ }
+}
+
+// SpanContextToRequest modifies the given request to include B3 headers.
+func (f *HTTPFormat) SpanContextToRequest(sc trace.SpanContext, req *http.Request) {
+ req.Header.Set(TraceIDHeader, hex.EncodeToString(sc.TraceID[:]))
+ req.Header.Set(SpanIDHeader, hex.EncodeToString(sc.SpanID[:]))
+
+ var sampled string
+ if sc.IsSampled() {
+ sampled = "1"
+ } else {
+ sampled = "0"
+ }
+ req.Header.Set(SampledHeader, sampled)
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/route.go b/vendor/go.opencensus.io/plugin/ochttp/route.go
new file mode 100644
index 0000000..dbe22d5
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/route.go
@@ -0,0 +1,51 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ochttp
+
+import (
+ "net/http"
+
+ "go.opencensus.io/tag"
+)
+
+// WithRouteTag returns an http.Handler that records stats with the
+// http_server_route tag set to the given value.
+func WithRouteTag(handler http.Handler, route string) http.Handler {
+ return taggedHandlerFunc(func(w http.ResponseWriter, r *http.Request) []tag.Mutator {
+ addRoute := []tag.Mutator{tag.Upsert(KeyServerRoute, route)}
+ ctx, _ := tag.New(r.Context(), addRoute...)
+ r = r.WithContext(ctx)
+ handler.ServeHTTP(w, r)
+ return addRoute
+ })
+}
+
+// taggedHandlerFunc is a http.Handler that returns tags describing the
+// processing of the request. These tags will be recorded along with the
+// measures in this package at the end of the request.
+type taggedHandlerFunc func(w http.ResponseWriter, r *http.Request) []tag.Mutator
+
+func (h taggedHandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ tags := h(w, r)
+ if a, ok := r.Context().Value(addedTagsKey{}).(*addedTags); ok {
+ a.t = append(a.t, tags...)
+ }
+}
+
+type addedTagsKey struct{}
+
+type addedTags struct {
+ t []tag.Mutator
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/server.go b/vendor/go.opencensus.io/plugin/ochttp/server.go
new file mode 100644
index 0000000..ff72de9
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/server.go
@@ -0,0 +1,440 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ochttp
+
+import (
+ "context"
+ "io"
+ "net/http"
+ "strconv"
+ "sync"
+ "time"
+
+ "go.opencensus.io/stats"
+ "go.opencensus.io/tag"
+ "go.opencensus.io/trace"
+ "go.opencensus.io/trace/propagation"
+)
+
+// Handler is an http.Handler wrapper to instrument your HTTP server with
+// OpenCensus. It supports both stats and tracing.
+//
+// Tracing
+//
+// This handler is aware of the incoming request's span, reading it from request
+// headers as configured using the Propagation field.
+// The extracted span can be accessed from the incoming request's
+// context.
+//
+// span := trace.FromContext(r.Context())
+//
+// The server span will be automatically ended at the end of ServeHTTP.
+type Handler struct {
+ // Propagation defines how traces are propagated. If unspecified,
+ // B3 propagation will be used.
+ Propagation propagation.HTTPFormat
+
+ // Handler is the handler used to handle the incoming request.
+ Handler http.Handler
+
+ // StartOptions are applied to the span started by this Handler around each
+ // request.
+ //
+ // StartOptions.SpanKind will always be set to trace.SpanKindServer
+ // for spans started by this transport.
+ StartOptions trace.StartOptions
+
+ // GetStartOptions allows to set start options per request. If set,
+ // StartOptions is going to be ignored.
+ GetStartOptions func(*http.Request) trace.StartOptions
+
+ // IsPublicEndpoint should be set to true for publicly accessible HTTP(S)
+ // servers. If true, any trace metadata set on the incoming request will
+ // be added as a linked trace instead of being added as a parent of the
+ // current trace.
+ IsPublicEndpoint bool
+
+ // FormatSpanName holds the function to use for generating the span name
+ // from the information found in the incoming HTTP Request. By default the
+ // name equals the URL Path.
+ FormatSpanName func(*http.Request) string
+}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ var tags addedTags
+ r, traceEnd := h.startTrace(w, r)
+ defer traceEnd()
+ w, statsEnd := h.startStats(w, r)
+ defer statsEnd(&tags)
+ handler := h.Handler
+ if handler == nil {
+ handler = http.DefaultServeMux
+ }
+ r = r.WithContext(context.WithValue(r.Context(), addedTagsKey{}, &tags))
+ handler.ServeHTTP(w, r)
+}
+
+func (h *Handler) startTrace(w http.ResponseWriter, r *http.Request) (*http.Request, func()) {
+ if isHealthEndpoint(r.URL.Path) {
+ return r, func() {}
+ }
+ var name string
+ if h.FormatSpanName == nil {
+ name = spanNameFromURL(r)
+ } else {
+ name = h.FormatSpanName(r)
+ }
+ ctx := r.Context()
+
+ startOpts := h.StartOptions
+ if h.GetStartOptions != nil {
+ startOpts = h.GetStartOptions(r)
+ }
+
+ var span *trace.Span
+ sc, ok := h.extractSpanContext(r)
+ if ok && !h.IsPublicEndpoint {
+ ctx, span = trace.StartSpanWithRemoteParent(ctx, name, sc,
+ trace.WithSampler(startOpts.Sampler),
+ trace.WithSpanKind(trace.SpanKindServer))
+ } else {
+ ctx, span = trace.StartSpan(ctx, name,
+ trace.WithSampler(startOpts.Sampler),
+ trace.WithSpanKind(trace.SpanKindServer),
+ )
+ if ok {
+ span.AddLink(trace.Link{
+ TraceID: sc.TraceID,
+ SpanID: sc.SpanID,
+ Type: trace.LinkTypeChild,
+ Attributes: nil,
+ })
+ }
+ }
+ span.AddAttributes(requestAttrs(r)...)
+ return r.WithContext(ctx), span.End
+}
+
+func (h *Handler) extractSpanContext(r *http.Request) (trace.SpanContext, bool) {
+ if h.Propagation == nil {
+ return defaultFormat.SpanContextFromRequest(r)
+ }
+ return h.Propagation.SpanContextFromRequest(r)
+}
+
+func (h *Handler) startStats(w http.ResponseWriter, r *http.Request) (http.ResponseWriter, func(tags *addedTags)) {
+ ctx, _ := tag.New(r.Context(),
+ tag.Upsert(Host, r.URL.Host),
+ tag.Upsert(Path, r.URL.Path),
+ tag.Upsert(Method, r.Method))
+ track := &trackingResponseWriter{
+ start: time.Now(),
+ ctx: ctx,
+ writer: w,
+ }
+ if r.Body == nil {
+ // TODO: Handle cases where ContentLength is not set.
+ track.reqSize = -1
+ } else if r.ContentLength > 0 {
+ track.reqSize = r.ContentLength
+ }
+ stats.Record(ctx, ServerRequestCount.M(1))
+ return track.wrappedResponseWriter(), track.end
+}
+
+type trackingResponseWriter struct {
+ ctx context.Context
+ reqSize int64
+ respSize int64
+ start time.Time
+ statusCode int
+ statusLine string
+ endOnce sync.Once
+ writer http.ResponseWriter
+}
+
+// Compile time assertion for ResponseWriter interface
+var _ http.ResponseWriter = (*trackingResponseWriter)(nil)
+
+var logTagsErrorOnce sync.Once
+
+func (t *trackingResponseWriter) end(tags *addedTags) {
+ t.endOnce.Do(func() {
+ if t.statusCode == 0 {
+ t.statusCode = 200
+ }
+
+ span := trace.FromContext(t.ctx)
+ span.SetStatus(TraceStatus(t.statusCode, t.statusLine))
+ span.AddAttributes(trace.Int64Attribute(StatusCodeAttribute, int64(t.statusCode)))
+
+ m := []stats.Measurement{
+ ServerLatency.M(float64(time.Since(t.start)) / float64(time.Millisecond)),
+ ServerResponseBytes.M(t.respSize),
+ }
+ if t.reqSize >= 0 {
+ m = append(m, ServerRequestBytes.M(t.reqSize))
+ }
+ allTags := make([]tag.Mutator, len(tags.t)+1)
+ allTags[0] = tag.Upsert(StatusCode, strconv.Itoa(t.statusCode))
+ copy(allTags[1:], tags.t)
+ stats.RecordWithTags(t.ctx, allTags, m...)
+ })
+}
+
+func (t *trackingResponseWriter) Header() http.Header {
+ return t.writer.Header()
+}
+
+func (t *trackingResponseWriter) Write(data []byte) (int, error) {
+ n, err := t.writer.Write(data)
+ t.respSize += int64(n)
+ return n, err
+}
+
+func (t *trackingResponseWriter) WriteHeader(statusCode int) {
+ t.writer.WriteHeader(statusCode)
+ t.statusCode = statusCode
+ t.statusLine = http.StatusText(t.statusCode)
+}
+
+// wrappedResponseWriter returns a wrapped version of the original
+// ResponseWriter and only implements the same combination of additional
+// interfaces as the original.
+// This implementation is based on https://github.com/felixge/httpsnoop.
+func (t *trackingResponseWriter) wrappedResponseWriter() http.ResponseWriter {
+ var (
+ hj, i0 = t.writer.(http.Hijacker)
+ cn, i1 = t.writer.(http.CloseNotifier)
+ pu, i2 = t.writer.(http.Pusher)
+ fl, i3 = t.writer.(http.Flusher)
+ rf, i4 = t.writer.(io.ReaderFrom)
+ )
+
+ switch {
+ case !i0 && !i1 && !i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ }{t}
+ case !i0 && !i1 && !i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ io.ReaderFrom
+ }{t, rf}
+ case !i0 && !i1 && !i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Flusher
+ }{t, fl}
+ case !i0 && !i1 && !i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Flusher
+ io.ReaderFrom
+ }{t, fl, rf}
+ case !i0 && !i1 && i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Pusher
+ }{t, pu}
+ case !i0 && !i1 && i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Pusher
+ io.ReaderFrom
+ }{t, pu, rf}
+ case !i0 && !i1 && i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Pusher
+ http.Flusher
+ }{t, pu, fl}
+ case !i0 && !i1 && i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Pusher
+ http.Flusher
+ io.ReaderFrom
+ }{t, pu, fl, rf}
+ case !i0 && i1 && !i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ }{t, cn}
+ case !i0 && i1 && !i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ io.ReaderFrom
+ }{t, cn, rf}
+ case !i0 && i1 && !i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ http.Flusher
+ }{t, cn, fl}
+ case !i0 && i1 && !i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ http.Flusher
+ io.ReaderFrom
+ }{t, cn, fl, rf}
+ case !i0 && i1 && i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ http.Pusher
+ }{t, cn, pu}
+ case !i0 && i1 && i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ http.Pusher
+ io.ReaderFrom
+ }{t, cn, pu, rf}
+ case !i0 && i1 && i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ http.Pusher
+ http.Flusher
+ }{t, cn, pu, fl}
+ case !i0 && i1 && i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.CloseNotifier
+ http.Pusher
+ http.Flusher
+ io.ReaderFrom
+ }{t, cn, pu, fl, rf}
+ case i0 && !i1 && !i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ }{t, hj}
+ case i0 && !i1 && !i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ io.ReaderFrom
+ }{t, hj, rf}
+ case i0 && !i1 && !i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.Flusher
+ }{t, hj, fl}
+ case i0 && !i1 && !i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.Flusher
+ io.ReaderFrom
+ }{t, hj, fl, rf}
+ case i0 && !i1 && i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.Pusher
+ }{t, hj, pu}
+ case i0 && !i1 && i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.Pusher
+ io.ReaderFrom
+ }{t, hj, pu, rf}
+ case i0 && !i1 && i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.Pusher
+ http.Flusher
+ }{t, hj, pu, fl}
+ case i0 && !i1 && i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.Pusher
+ http.Flusher
+ io.ReaderFrom
+ }{t, hj, pu, fl, rf}
+ case i0 && i1 && !i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ }{t, hj, cn}
+ case i0 && i1 && !i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ io.ReaderFrom
+ }{t, hj, cn, rf}
+ case i0 && i1 && !i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ http.Flusher
+ }{t, hj, cn, fl}
+ case i0 && i1 && !i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ http.Flusher
+ io.ReaderFrom
+ }{t, hj, cn, fl, rf}
+ case i0 && i1 && i2 && !i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ http.Pusher
+ }{t, hj, cn, pu}
+ case i0 && i1 && i2 && !i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ http.Pusher
+ io.ReaderFrom
+ }{t, hj, cn, pu, rf}
+ case i0 && i1 && i2 && i3 && !i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ http.Pusher
+ http.Flusher
+ }{t, hj, cn, pu, fl}
+ case i0 && i1 && i2 && i3 && i4:
+ return struct {
+ http.ResponseWriter
+ http.Hijacker
+ http.CloseNotifier
+ http.Pusher
+ http.Flusher
+ io.ReaderFrom
+ }{t, hj, cn, pu, fl, rf}
+ default:
+ return struct {
+ http.ResponseWriter
+ }{t}
+ }
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/span_annotating_client_trace.go b/vendor/go.opencensus.io/plugin/ochttp/span_annotating_client_trace.go
new file mode 100644
index 0000000..05c6c56
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/span_annotating_client_trace.go
@@ -0,0 +1,169 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ochttp
+
+import (
+ "crypto/tls"
+ "net/http"
+ "net/http/httptrace"
+ "strings"
+
+ "go.opencensus.io/trace"
+)
+
+type spanAnnotator struct {
+ sp *trace.Span
+}
+
+// TODO: Remove NewSpanAnnotator at the next release.
+
+// NewSpanAnnotator returns a httptrace.ClientTrace which annotates
+// all emitted httptrace events on the provided Span.
+// Deprecated: Use NewSpanAnnotatingClientTrace instead
+func NewSpanAnnotator(r *http.Request, s *trace.Span) *httptrace.ClientTrace {
+ return NewSpanAnnotatingClientTrace(r, s)
+}
+
+// NewSpanAnnotatingClientTrace returns a httptrace.ClientTrace which annotates
+// all emitted httptrace events on the provided Span.
+func NewSpanAnnotatingClientTrace(_ *http.Request, s *trace.Span) *httptrace.ClientTrace {
+ sa := spanAnnotator{sp: s}
+
+ return &httptrace.ClientTrace{
+ GetConn: sa.getConn,
+ GotConn: sa.gotConn,
+ PutIdleConn: sa.putIdleConn,
+ GotFirstResponseByte: sa.gotFirstResponseByte,
+ Got100Continue: sa.got100Continue,
+ DNSStart: sa.dnsStart,
+ DNSDone: sa.dnsDone,
+ ConnectStart: sa.connectStart,
+ ConnectDone: sa.connectDone,
+ TLSHandshakeStart: sa.tlsHandshakeStart,
+ TLSHandshakeDone: sa.tlsHandshakeDone,
+ WroteHeaders: sa.wroteHeaders,
+ Wait100Continue: sa.wait100Continue,
+ WroteRequest: sa.wroteRequest,
+ }
+}
+
+func (s spanAnnotator) getConn(hostPort string) {
+ attrs := []trace.Attribute{
+ trace.StringAttribute("httptrace.get_connection.host_port", hostPort),
+ }
+ s.sp.Annotate(attrs, "GetConn")
+}
+
+func (s spanAnnotator) gotConn(info httptrace.GotConnInfo) {
+ attrs := []trace.Attribute{
+ trace.BoolAttribute("httptrace.got_connection.reused", info.Reused),
+ trace.BoolAttribute("httptrace.got_connection.was_idle", info.WasIdle),
+ }
+ if info.WasIdle {
+ attrs = append(attrs,
+ trace.StringAttribute("httptrace.got_connection.idle_time", info.IdleTime.String()))
+ }
+ s.sp.Annotate(attrs, "GotConn")
+}
+
+// PutIdleConn implements a httptrace.ClientTrace hook
+func (s spanAnnotator) putIdleConn(err error) {
+ var attrs []trace.Attribute
+ if err != nil {
+ attrs = append(attrs,
+ trace.StringAttribute("httptrace.put_idle_connection.error", err.Error()))
+ }
+ s.sp.Annotate(attrs, "PutIdleConn")
+}
+
+func (s spanAnnotator) gotFirstResponseByte() {
+ s.sp.Annotate(nil, "GotFirstResponseByte")
+}
+
+func (s spanAnnotator) got100Continue() {
+ s.sp.Annotate(nil, "Got100Continue")
+}
+
+func (s spanAnnotator) dnsStart(info httptrace.DNSStartInfo) {
+ attrs := []trace.Attribute{
+ trace.StringAttribute("httptrace.dns_start.host", info.Host),
+ }
+ s.sp.Annotate(attrs, "DNSStart")
+}
+
+func (s spanAnnotator) dnsDone(info httptrace.DNSDoneInfo) {
+ var addrs []string
+ for _, addr := range info.Addrs {
+ addrs = append(addrs, addr.String())
+ }
+ attrs := []trace.Attribute{
+ trace.StringAttribute("httptrace.dns_done.addrs", strings.Join(addrs, " , ")),
+ }
+ if info.Err != nil {
+ attrs = append(attrs,
+ trace.StringAttribute("httptrace.dns_done.error", info.Err.Error()))
+ }
+ s.sp.Annotate(attrs, "DNSDone")
+}
+
+func (s spanAnnotator) connectStart(network, addr string) {
+ attrs := []trace.Attribute{
+ trace.StringAttribute("httptrace.connect_start.network", network),
+ trace.StringAttribute("httptrace.connect_start.addr", addr),
+ }
+ s.sp.Annotate(attrs, "ConnectStart")
+}
+
+func (s spanAnnotator) connectDone(network, addr string, err error) {
+ attrs := []trace.Attribute{
+ trace.StringAttribute("httptrace.connect_done.network", network),
+ trace.StringAttribute("httptrace.connect_done.addr", addr),
+ }
+ if err != nil {
+ attrs = append(attrs,
+ trace.StringAttribute("httptrace.connect_done.error", err.Error()))
+ }
+ s.sp.Annotate(attrs, "ConnectDone")
+}
+
+func (s spanAnnotator) tlsHandshakeStart() {
+ s.sp.Annotate(nil, "TLSHandshakeStart")
+}
+
+func (s spanAnnotator) tlsHandshakeDone(_ tls.ConnectionState, err error) {
+ var attrs []trace.Attribute
+ if err != nil {
+ attrs = append(attrs,
+ trace.StringAttribute("httptrace.tls_handshake_done.error", err.Error()))
+ }
+ s.sp.Annotate(attrs, "TLSHandshakeDone")
+}
+
+func (s spanAnnotator) wroteHeaders() {
+ s.sp.Annotate(nil, "WroteHeaders")
+}
+
+func (s spanAnnotator) wait100Continue() {
+ s.sp.Annotate(nil, "Wait100Continue")
+}
+
+func (s spanAnnotator) wroteRequest(info httptrace.WroteRequestInfo) {
+ var attrs []trace.Attribute
+ if info.Err != nil {
+ attrs = append(attrs,
+ trace.StringAttribute("httptrace.wrote_request.error", info.Err.Error()))
+ }
+ s.sp.Annotate(attrs, "WroteRequest")
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/stats.go b/vendor/go.opencensus.io/plugin/ochttp/stats.go
new file mode 100644
index 0000000..46dcc8e
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/stats.go
@@ -0,0 +1,265 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ochttp
+
+import (
+ "go.opencensus.io/stats"
+ "go.opencensus.io/stats/view"
+ "go.opencensus.io/tag"
+)
+
+// The following client HTTP measures are supported for use in custom views.
+var (
+ // Deprecated: Use a Count aggregation over one of the other client measures to achieve the same effect.
+ ClientRequestCount = stats.Int64("opencensus.io/http/client/request_count", "Number of HTTP requests started", stats.UnitDimensionless)
+ // Deprecated: Use ClientSentBytes.
+ ClientRequestBytes = stats.Int64("opencensus.io/http/client/request_bytes", "HTTP request body size if set as ContentLength (uncompressed)", stats.UnitBytes)
+ // Deprecated: Use ClientReceivedBytes.
+ ClientResponseBytes = stats.Int64("opencensus.io/http/client/response_bytes", "HTTP response body size (uncompressed)", stats.UnitBytes)
+ // Deprecated: Use ClientRoundtripLatency.
+ ClientLatency = stats.Float64("opencensus.io/http/client/latency", "End-to-end latency", stats.UnitMilliseconds)
+)
+
+// Client measures supported for use in custom views.
+var (
+ ClientSentBytes = stats.Int64(
+ "opencensus.io/http/client/sent_bytes",
+ "Total bytes sent in request body (not including headers)",
+ stats.UnitBytes,
+ )
+ ClientReceivedBytes = stats.Int64(
+ "opencensus.io/http/client/received_bytes",
+ "Total bytes received in response bodies (not including headers but including error responses with bodies)",
+ stats.UnitBytes,
+ )
+ ClientRoundtripLatency = stats.Float64(
+ "opencensus.io/http/client/roundtrip_latency",
+ "Time between first byte of request headers sent to last byte of response received, or terminal error",
+ stats.UnitMilliseconds,
+ )
+)
+
+// The following server HTTP measures are supported for use in custom views:
+var (
+ ServerRequestCount = stats.Int64("opencensus.io/http/server/request_count", "Number of HTTP requests started", stats.UnitDimensionless)
+ ServerRequestBytes = stats.Int64("opencensus.io/http/server/request_bytes", "HTTP request body size if set as ContentLength (uncompressed)", stats.UnitBytes)
+ ServerResponseBytes = stats.Int64("opencensus.io/http/server/response_bytes", "HTTP response body size (uncompressed)", stats.UnitBytes)
+ ServerLatency = stats.Float64("opencensus.io/http/server/latency", "End-to-end latency", stats.UnitMilliseconds)
+)
+
+// The following tags are applied to stats recorded by this package. Host, Path
+// and Method are applied to all measures. StatusCode is not applied to
+// ClientRequestCount or ServerRequestCount, since it is recorded before the status is known.
+var (
+ // Host is the value of the HTTP Host header.
+ //
+ // The value of this tag can be controlled by the HTTP client, so you need
+ // to watch out for potentially generating high-cardinality labels in your
+ // metrics backend if you use this tag in views.
+ Host, _ = tag.NewKey("http.host")
+
+ // StatusCode is the numeric HTTP response status code,
+ // or "error" if a transport error occurred and no status code was read.
+ StatusCode, _ = tag.NewKey("http.status")
+
+ // Path is the URL path (not including query string) in the request.
+ //
+ // The value of this tag can be controlled by the HTTP client, so you need
+ // to watch out for potentially generating high-cardinality labels in your
+ // metrics backend if you use this tag in views.
+ Path, _ = tag.NewKey("http.path")
+
+ // Method is the HTTP method of the request, capitalized (GET, POST, etc.).
+ Method, _ = tag.NewKey("http.method")
+
+ // KeyServerRoute is a low cardinality string representing the logical
+ // handler of the request. This is usually the pattern registered on the a
+ // ServeMux (or similar string).
+ KeyServerRoute, _ = tag.NewKey("http_server_route")
+)
+
+// Client tag keys.
+var (
+ // KeyClientMethod is the HTTP method, capitalized (i.e. GET, POST, PUT, DELETE, etc.).
+ KeyClientMethod, _ = tag.NewKey("http_client_method")
+ // KeyClientPath is the URL path (not including query string).
+ KeyClientPath, _ = tag.NewKey("http_client_path")
+ // KeyClientStatus is the HTTP status code as an integer (e.g. 200, 404, 500.), or "error" if no response status line was received.
+ KeyClientStatus, _ = tag.NewKey("http_client_status")
+ // KeyClientHost is the value of the request Host header.
+ KeyClientHost, _ = tag.NewKey("http_client_host")
+)
+
+// Default distributions used by views in this package.
+var (
+ DefaultSizeDistribution = view.Distribution(0, 1024, 2048, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216, 67108864, 268435456, 1073741824, 4294967296)
+ DefaultLatencyDistribution = view.Distribution(0, 1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 30, 40, 50, 65, 80, 100, 130, 160, 200, 250, 300, 400, 500, 650, 800, 1000, 2000, 5000, 10000, 20000, 50000, 100000)
+)
+
+// Package ochttp provides some convenience views.
+// You still need to register these views for data to actually be collected.
+var (
+ ClientSentBytesDistribution = &view.View{
+ Name: "opencensus.io/http/client/sent_bytes",
+ Measure: ClientSentBytes,
+ Aggregation: DefaultSizeDistribution,
+ Description: "Total bytes sent in request body (not including headers), by HTTP method and response status",
+ TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
+ }
+
+ ClientReceivedBytesDistribution = &view.View{
+ Name: "opencensus.io/http/client/received_bytes",
+ Measure: ClientReceivedBytes,
+ Aggregation: DefaultSizeDistribution,
+ Description: "Total bytes received in response bodies (not including headers but including error responses with bodies), by HTTP method and response status",
+ TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
+ }
+
+ ClientRoundtripLatencyDistribution = &view.View{
+ Name: "opencensus.io/http/client/roundtrip_latency",
+ Measure: ClientRoundtripLatency,
+ Aggregation: DefaultLatencyDistribution,
+ Description: "End-to-end latency, by HTTP method and response status",
+ TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
+ }
+
+ ClientCompletedCount = &view.View{
+ Name: "opencensus.io/http/client/completed_count",
+ Measure: ClientRoundtripLatency,
+ Aggregation: view.Count(),
+ Description: "Count of completed requests, by HTTP method and response status",
+ TagKeys: []tag.Key{KeyClientMethod, KeyClientStatus},
+ }
+)
+
+var (
+ // Deprecated: No direct replacement, but see ClientCompletedCount.
+ ClientRequestCountView = &view.View{
+ Name: "opencensus.io/http/client/request_count",
+ Description: "Count of HTTP requests started",
+ Measure: ClientRequestCount,
+ Aggregation: view.Count(),
+ }
+
+ // Deprecated: Use ClientSentBytesDistribution.
+ ClientRequestBytesView = &view.View{
+ Name: "opencensus.io/http/client/request_bytes",
+ Description: "Size distribution of HTTP request body",
+ Measure: ClientSentBytes,
+ Aggregation: DefaultSizeDistribution,
+ }
+
+ // Deprecated: Use ClientReceivedBytesDistribution.
+ ClientResponseBytesView = &view.View{
+ Name: "opencensus.io/http/client/response_bytes",
+ Description: "Size distribution of HTTP response body",
+ Measure: ClientReceivedBytes,
+ Aggregation: DefaultSizeDistribution,
+ }
+
+ // Deprecated: Use ClientRoundtripLatencyDistribution.
+ ClientLatencyView = &view.View{
+ Name: "opencensus.io/http/client/latency",
+ Description: "Latency distribution of HTTP requests",
+ Measure: ClientRoundtripLatency,
+ Aggregation: DefaultLatencyDistribution,
+ }
+
+ // Deprecated: Use ClientCompletedCount.
+ ClientRequestCountByMethod = &view.View{
+ Name: "opencensus.io/http/client/request_count_by_method",
+ Description: "Client request count by HTTP method",
+ TagKeys: []tag.Key{Method},
+ Measure: ClientSentBytes,
+ Aggregation: view.Count(),
+ }
+
+ // Deprecated: Use ClientCompletedCount.
+ ClientResponseCountByStatusCode = &view.View{
+ Name: "opencensus.io/http/client/response_count_by_status_code",
+ Description: "Client response count by status code",
+ TagKeys: []tag.Key{StatusCode},
+ Measure: ClientRoundtripLatency,
+ Aggregation: view.Count(),
+ }
+)
+
+var (
+ ServerRequestCountView = &view.View{
+ Name: "opencensus.io/http/server/request_count",
+ Description: "Count of HTTP requests started",
+ Measure: ServerRequestCount,
+ Aggregation: view.Count(),
+ }
+
+ ServerRequestBytesView = &view.View{
+ Name: "opencensus.io/http/server/request_bytes",
+ Description: "Size distribution of HTTP request body",
+ Measure: ServerRequestBytes,
+ Aggregation: DefaultSizeDistribution,
+ }
+
+ ServerResponseBytesView = &view.View{
+ Name: "opencensus.io/http/server/response_bytes",
+ Description: "Size distribution of HTTP response body",
+ Measure: ServerResponseBytes,
+ Aggregation: DefaultSizeDistribution,
+ }
+
+ ServerLatencyView = &view.View{
+ Name: "opencensus.io/http/server/latency",
+ Description: "Latency distribution of HTTP requests",
+ Measure: ServerLatency,
+ Aggregation: DefaultLatencyDistribution,
+ }
+
+ ServerRequestCountByMethod = &view.View{
+ Name: "opencensus.io/http/server/request_count_by_method",
+ Description: "Server request count by HTTP method",
+ TagKeys: []tag.Key{Method},
+ Measure: ServerRequestCount,
+ Aggregation: view.Count(),
+ }
+
+ ServerResponseCountByStatusCode = &view.View{
+ Name: "opencensus.io/http/server/response_count_by_status_code",
+ Description: "Server response count by status code",
+ TagKeys: []tag.Key{StatusCode},
+ Measure: ServerLatency,
+ Aggregation: view.Count(),
+ }
+)
+
+// DefaultClientViews are the default client views provided by this package.
+// Deprecated: No replacement. Register the views you would like individually.
+var DefaultClientViews = []*view.View{
+ ClientRequestCountView,
+ ClientRequestBytesView,
+ ClientResponseBytesView,
+ ClientLatencyView,
+ ClientRequestCountByMethod,
+ ClientResponseCountByStatusCode,
+}
+
+// DefaultServerViews are the default server views provided by this package.
+// Deprecated: No replacement. Register the views you would like individually.
+var DefaultServerViews = []*view.View{
+ ServerRequestCountView,
+ ServerRequestBytesView,
+ ServerResponseBytesView,
+ ServerLatencyView,
+ ServerRequestCountByMethod,
+ ServerResponseCountByStatusCode,
+}
diff --git a/vendor/go.opencensus.io/plugin/ochttp/trace.go b/vendor/go.opencensus.io/plugin/ochttp/trace.go
new file mode 100644
index 0000000..819a2d5
--- /dev/null
+++ b/vendor/go.opencensus.io/plugin/ochttp/trace.go
@@ -0,0 +1,228 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ochttp
+
+import (
+ "io"
+ "net/http"
+ "net/http/httptrace"
+
+ "go.opencensus.io/plugin/ochttp/propagation/b3"
+ "go.opencensus.io/trace"
+ "go.opencensus.io/trace/propagation"
+)
+
+// TODO(jbd): Add godoc examples.
+
+var defaultFormat propagation.HTTPFormat = &b3.HTTPFormat{}
+
+// Attributes recorded on the span for the requests.
+// Only trace exporters will need them.
+const (
+ HostAttribute = "http.host"
+ MethodAttribute = "http.method"
+ PathAttribute = "http.path"
+ UserAgentAttribute = "http.user_agent"
+ StatusCodeAttribute = "http.status_code"
+)
+
+type traceTransport struct {
+ base http.RoundTripper
+ startOptions trace.StartOptions
+ format propagation.HTTPFormat
+ formatSpanName func(*http.Request) string
+ newClientTrace func(*http.Request, *trace.Span) *httptrace.ClientTrace
+}
+
+// TODO(jbd): Add message events for request and response size.
+
+// RoundTrip creates a trace.Span and inserts it into the outgoing request's headers.
+// The created span can follow a parent span, if a parent is presented in
+// the request's context.
+func (t *traceTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+ name := t.formatSpanName(req)
+ // TODO(jbd): Discuss whether we want to prefix
+ // outgoing requests with Sent.
+ ctx, span := trace.StartSpan(req.Context(), name,
+ trace.WithSampler(t.startOptions.Sampler),
+ trace.WithSpanKind(trace.SpanKindClient))
+
+ if t.newClientTrace != nil {
+ req = req.WithContext(httptrace.WithClientTrace(ctx, t.newClientTrace(req, span)))
+ } else {
+ req = req.WithContext(ctx)
+ }
+
+ if t.format != nil {
+ // SpanContextToRequest will modify its Request argument, which is
+ // contrary to the contract for http.RoundTripper, so we need to
+ // pass it a copy of the Request.
+ // However, the Request struct itself was already copied by
+ // the WithContext calls above and so we just need to copy the header.
+ header := make(http.Header)
+ for k, v := range req.Header {
+ header[k] = v
+ }
+ req.Header = header
+ t.format.SpanContextToRequest(span.SpanContext(), req)
+ }
+
+ span.AddAttributes(requestAttrs(req)...)
+ resp, err := t.base.RoundTrip(req)
+ if err != nil {
+ span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
+ span.End()
+ return resp, err
+ }
+
+ span.AddAttributes(responseAttrs(resp)...)
+ span.SetStatus(TraceStatus(resp.StatusCode, resp.Status))
+
+ // span.End() will be invoked after
+ // a read from resp.Body returns io.EOF or when
+ // resp.Body.Close() is invoked.
+ resp.Body = &bodyTracker{rc: resp.Body, span: span}
+ return resp, err
+}
+
+// bodyTracker wraps a response.Body and invokes
+// trace.EndSpan on encountering io.EOF on reading
+// the body of the original response.
+type bodyTracker struct {
+ rc io.ReadCloser
+ span *trace.Span
+}
+
+var _ io.ReadCloser = (*bodyTracker)(nil)
+
+func (bt *bodyTracker) Read(b []byte) (int, error) {
+ n, err := bt.rc.Read(b)
+
+ switch err {
+ case nil:
+ return n, nil
+ case io.EOF:
+ bt.span.End()
+ default:
+ // For all other errors, set the span status
+ bt.span.SetStatus(trace.Status{
+ // Code 2 is the error code for Internal server error.
+ Code: 2,
+ Message: err.Error(),
+ })
+ }
+ return n, err
+}
+
+func (bt *bodyTracker) Close() error {
+ // Invoking endSpan on Close will help catch the cases
+ // in which a read returned a non-nil error, we set the
+ // span status but didn't end the span.
+ bt.span.End()
+ return bt.rc.Close()
+}
+
+// CancelRequest cancels an in-flight request by closing its connection.
+func (t *traceTransport) CancelRequest(req *http.Request) {
+ type canceler interface {
+ CancelRequest(*http.Request)
+ }
+ if cr, ok := t.base.(canceler); ok {
+ cr.CancelRequest(req)
+ }
+}
+
+func spanNameFromURL(req *http.Request) string {
+ return req.URL.Path
+}
+
+func requestAttrs(r *http.Request) []trace.Attribute {
+ return []trace.Attribute{
+ trace.StringAttribute(PathAttribute, r.URL.Path),
+ trace.StringAttribute(HostAttribute, r.URL.Host),
+ trace.StringAttribute(MethodAttribute, r.Method),
+ trace.StringAttribute(UserAgentAttribute, r.UserAgent()),
+ }
+}
+
+func responseAttrs(resp *http.Response) []trace.Attribute {
+ return []trace.Attribute{
+ trace.Int64Attribute(StatusCodeAttribute, int64(resp.StatusCode)),
+ }
+}
+
+// TraceStatus is a utility to convert the HTTP status code to a trace.Status that
+// represents the outcome as closely as possible.
+func TraceStatus(httpStatusCode int, statusLine string) trace.Status {
+ var code int32
+ if httpStatusCode < 200 || httpStatusCode >= 400 {
+ code = trace.StatusCodeUnknown
+ }
+ switch httpStatusCode {
+ case 499:
+ code = trace.StatusCodeCancelled
+ case http.StatusBadRequest:
+ code = trace.StatusCodeInvalidArgument
+ case http.StatusGatewayTimeout:
+ code = trace.StatusCodeDeadlineExceeded
+ case http.StatusNotFound:
+ code = trace.StatusCodeNotFound
+ case http.StatusForbidden:
+ code = trace.StatusCodePermissionDenied
+ case http.StatusUnauthorized: // 401 is actually unauthenticated.
+ code = trace.StatusCodeUnauthenticated
+ case http.StatusTooManyRequests:
+ code = trace.StatusCodeResourceExhausted
+ case http.StatusNotImplemented:
+ code = trace.StatusCodeUnimplemented
+ case http.StatusServiceUnavailable:
+ code = trace.StatusCodeUnavailable
+ case http.StatusOK:
+ code = trace.StatusCodeOK
+ }
+ return trace.Status{Code: code, Message: codeToStr[code]}
+}
+
+var codeToStr = map[int32]string{
+ trace.StatusCodeOK: `OK`,
+ trace.StatusCodeCancelled: `CANCELLED`,
+ trace.StatusCodeUnknown: `UNKNOWN`,
+ trace.StatusCodeInvalidArgument: `INVALID_ARGUMENT`,
+ trace.StatusCodeDeadlineExceeded: `DEADLINE_EXCEEDED`,
+ trace.StatusCodeNotFound: `NOT_FOUND`,
+ trace.StatusCodeAlreadyExists: `ALREADY_EXISTS`,
+ trace.StatusCodePermissionDenied: `PERMISSION_DENIED`,
+ trace.StatusCodeResourceExhausted: `RESOURCE_EXHAUSTED`,
+ trace.StatusCodeFailedPrecondition: `FAILED_PRECONDITION`,
+ trace.StatusCodeAborted: `ABORTED`,
+ trace.StatusCodeOutOfRange: `OUT_OF_RANGE`,
+ trace.StatusCodeUnimplemented: `UNIMPLEMENTED`,
+ trace.StatusCodeInternal: `INTERNAL`,
+ trace.StatusCodeUnavailable: `UNAVAILABLE`,
+ trace.StatusCodeDataLoss: `DATA_LOSS`,
+ trace.StatusCodeUnauthenticated: `UNAUTHENTICATED`,
+}
+
+func isHealthEndpoint(path string) bool {
+ // Health checking is pretty frequent and
+ // traces collected for health endpoints
+ // can be extremely noisy and expensive.
+ // Disable canonical health checking endpoints
+ // like /healthz and /_ah/health for now.
+ if path == "/healthz" || path == "/_ah/health" {
+ return true
+ }
+ return false
+}
diff --git a/vendor/go.opencensus.io/stats/doc.go b/vendor/go.opencensus.io/stats/doc.go
new file mode 100644
index 0000000..00d473e
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/doc.go
@@ -0,0 +1,69 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+/*
+Package stats contains support for OpenCensus stats recording.
+
+OpenCensus allows users to create typed measures, record measurements,
+aggregate the collected data, and export the aggregated data.
+
+Measures
+
+A measure represents a type of data point to be tracked and recorded.
+For example, latency, request Mb/s, and response Mb/s are measures
+to collect from a server.
+
+Measure constructors such as Int64 and Float64 automatically
+register the measure by the given name. Each registered measure needs
+to be unique by name. Measures also have a description and a unit.
+
+Libraries can define and export measures. Application authors can then
+create views and collect and break down measures by the tags they are
+interested in.
+
+Recording measurements
+
+Measurement is a data point to be collected for a measure. For example,
+for a latency (ms) measure, 100 is a measurement that represents a 100ms
+latency event. Measurements are created from measures with
+the current context. Tags from the current context are recorded with the
+measurements if they are any.
+
+Recorded measurements are dropped immediately if no views are registered for them.
+There is usually no need to conditionally enable and disable
+recording to reduce cost. Recording of measurements is cheap.
+
+Libraries can always record measurements, and applications can later decide
+on which measurements they want to collect by registering views. This allows
+libraries to turn on the instrumentation by default.
+
+Exemplars
+
+For a given recorded measurement, the associated exemplar is a diagnostic map
+that gives more information about the measurement.
+
+When aggregated using a Distribution aggregation, an exemplar is kept for each
+bucket in the Distribution. This allows you to easily find an example of a
+measurement that fell into each bucket.
+
+For example, if you also use the OpenCensus trace package and you
+record a measurement with a context that contains a sampled trace span,
+then the trace span will be added to the exemplar associated with the measurement.
+
+When exported to a supporting back end, you should be able to easily navigate
+to example traces that fell into each bucket in the Distribution.
+
+*/
+package stats // import "go.opencensus.io/stats"
diff --git a/vendor/go.opencensus.io/stats/internal/record.go b/vendor/go.opencensus.io/stats/internal/record.go
new file mode 100644
index 0000000..ed54552
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/internal/record.go
@@ -0,0 +1,25 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import (
+ "go.opencensus.io/tag"
+)
+
+// DefaultRecorder will be called for each Record call.
+var DefaultRecorder func(tags *tag.Map, measurement interface{}, attachments map[string]string)
+
+// SubscriptionReporter reports when a view subscribed with a measure.
+var SubscriptionReporter func(measure string)
diff --git a/vendor/go.opencensus.io/stats/internal/validation.go b/vendor/go.opencensus.io/stats/internal/validation.go
new file mode 100644
index 0000000..b946667
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/internal/validation.go
@@ -0,0 +1,28 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal // import "go.opencensus.io/stats/internal"
+
+const (
+ MaxNameLength = 255
+)
+
+func IsPrintable(str string) bool {
+ for _, r := range str {
+ if !(r >= ' ' && r <= '~') {
+ return false
+ }
+ }
+ return true
+}
diff --git a/vendor/go.opencensus.io/stats/measure.go b/vendor/go.opencensus.io/stats/measure.go
new file mode 100644
index 0000000..64d02b1
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/measure.go
@@ -0,0 +1,123 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package stats
+
+import (
+ "sync"
+ "sync/atomic"
+)
+
+// Measure represents a single numeric value to be tracked and recorded.
+// For example, latency, request bytes, and response bytes could be measures
+// to collect from a server.
+//
+// Measures by themselves have no outside effects. In order to be exported,
+// the measure needs to be used in a View. If no Views are defined over a
+// measure, there is very little cost in recording it.
+type Measure interface {
+ // Name returns the name of this measure.
+ //
+ // Measure names are globally unique (among all libraries linked into your program).
+ // We recommend prefixing the measure name with a domain name relevant to your
+ // project or application.
+ //
+ // Measure names are never sent over the wire or exported to backends.
+ // They are only used to create Views.
+ Name() string
+
+ // Description returns the human-readable description of this measure.
+ Description() string
+
+ // Unit returns the units for the values this measure takes on.
+ //
+ // Units are encoded according to the case-sensitive abbreviations from the
+ // Unified Code for Units of Measure: http://unitsofmeasure.org/ucum.html
+ Unit() string
+}
+
+// measureDescriptor is the untyped descriptor associated with each measure.
+// Int64Measure and Float64Measure wrap measureDescriptor to provide typed
+// recording APIs.
+// Two Measures with the same name will have the same measureDescriptor.
+type measureDescriptor struct {
+ subs int32 // access atomically
+
+ name string
+ description string
+ unit string
+}
+
+func (m *measureDescriptor) subscribe() {
+ atomic.StoreInt32(&m.subs, 1)
+}
+
+func (m *measureDescriptor) subscribed() bool {
+ return atomic.LoadInt32(&m.subs) == 1
+}
+
+// Name returns the name of the measure.
+func (m *measureDescriptor) Name() string {
+ return m.name
+}
+
+// Description returns the description of the measure.
+func (m *measureDescriptor) Description() string {
+ return m.description
+}
+
+// Unit returns the unit of the measure.
+func (m *measureDescriptor) Unit() string {
+ return m.unit
+}
+
+var (
+ mu sync.RWMutex
+ measures = make(map[string]*measureDescriptor)
+)
+
+func registerMeasureHandle(name, desc, unit string) *measureDescriptor {
+ mu.Lock()
+ defer mu.Unlock()
+
+ if stored, ok := measures[name]; ok {
+ return stored
+ }
+ m := &measureDescriptor{
+ name: name,
+ description: desc,
+ unit: unit,
+ }
+ measures[name] = m
+ return m
+}
+
+// Measurement is the numeric value measured when recording stats. Each measure
+// provides methods to create measurements of their kind. For example, Int64Measure
+// provides M to convert an int64 into a measurement.
+type Measurement struct {
+ v float64
+ m *measureDescriptor
+}
+
+// Value returns the value of the Measurement as a float64.
+func (m Measurement) Value() float64 {
+ return m.v
+}
+
+// Measure returns the Measure from which this Measurement was created.
+func (m Measurement) Measure() Measure {
+ return m.m
+}
diff --git a/vendor/go.opencensus.io/stats/measure_float64.go b/vendor/go.opencensus.io/stats/measure_float64.go
new file mode 100644
index 0000000..acedb21
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/measure_float64.go
@@ -0,0 +1,36 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package stats
+
+// Float64Measure is a measure for float64 values.
+type Float64Measure struct {
+ *measureDescriptor
+}
+
+// M creates a new float64 measurement.
+// Use Record to record measurements.
+func (m *Float64Measure) M(v float64) Measurement {
+ return Measurement{m: m.measureDescriptor, v: v}
+}
+
+// Float64 creates a new measure for float64 values.
+//
+// See the documentation for interface Measure for more guidance on the
+// parameters of this function.
+func Float64(name, description, unit string) *Float64Measure {
+ mi := registerMeasureHandle(name, description, unit)
+ return &Float64Measure{mi}
+}
diff --git a/vendor/go.opencensus.io/stats/measure_int64.go b/vendor/go.opencensus.io/stats/measure_int64.go
new file mode 100644
index 0000000..c4243ba
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/measure_int64.go
@@ -0,0 +1,36 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package stats
+
+// Int64Measure is a measure for int64 values.
+type Int64Measure struct {
+ *measureDescriptor
+}
+
+// M creates a new int64 measurement.
+// Use Record to record measurements.
+func (m *Int64Measure) M(v int64) Measurement {
+ return Measurement{m: m.measureDescriptor, v: float64(v)}
+}
+
+// Int64 creates a new measure for int64 values.
+//
+// See the documentation for interface Measure for more guidance on the
+// parameters of this function.
+func Int64(name, description, unit string) *Int64Measure {
+ mi := registerMeasureHandle(name, description, unit)
+ return &Int64Measure{mi}
+}
diff --git a/vendor/go.opencensus.io/stats/record.go b/vendor/go.opencensus.io/stats/record.go
new file mode 100644
index 0000000..0aced02
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/record.go
@@ -0,0 +1,69 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package stats
+
+import (
+ "context"
+
+ "go.opencensus.io/exemplar"
+ "go.opencensus.io/stats/internal"
+ "go.opencensus.io/tag"
+)
+
+func init() {
+ internal.SubscriptionReporter = func(measure string) {
+ mu.Lock()
+ measures[measure].subscribe()
+ mu.Unlock()
+ }
+}
+
+// Record records one or multiple measurements with the same context at once.
+// If there are any tags in the context, measurements will be tagged with them.
+func Record(ctx context.Context, ms ...Measurement) {
+ recorder := internal.DefaultRecorder
+ if recorder == nil {
+ return
+ }
+ if len(ms) == 0 {
+ return
+ }
+ record := false
+ for _, m := range ms {
+ if m.m.subscribed() {
+ record = true
+ break
+ }
+ }
+ if !record {
+ return
+ }
+ recorder(tag.FromContext(ctx), ms, exemplar.AttachmentsFromContext(ctx))
+}
+
+// RecordWithTags records one or multiple measurements at once.
+//
+// Measurements will be tagged with the tags in the context mutated by the mutators.
+// RecordWithTags is useful if you want to record with tag mutations but don't want
+// to propagate the mutations in the context.
+func RecordWithTags(ctx context.Context, mutators []tag.Mutator, ms ...Measurement) error {
+ ctx, err := tag.New(ctx, mutators...)
+ if err != nil {
+ return err
+ }
+ Record(ctx, ms...)
+ return nil
+}
diff --git a/vendor/go.opencensus.io/stats/units.go b/vendor/go.opencensus.io/stats/units.go
new file mode 100644
index 0000000..6931a5f
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/units.go
@@ -0,0 +1,25 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package stats
+
+// Units are encoded according to the case-sensitive abbreviations from the
+// Unified Code for Units of Measure: http://unitsofmeasure.org/ucum.html
+const (
+ UnitNone = "1" // Deprecated: Use UnitDimensionless.
+ UnitDimensionless = "1"
+ UnitBytes = "By"
+ UnitMilliseconds = "ms"
+)
diff --git a/vendor/go.opencensus.io/stats/view/aggregation.go b/vendor/go.opencensus.io/stats/view/aggregation.go
new file mode 100644
index 0000000..b7f169b
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/aggregation.go
@@ -0,0 +1,120 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package view
+
+// AggType represents the type of aggregation function used on a View.
+type AggType int
+
+// All available aggregation types.
+const (
+ AggTypeNone AggType = iota // no aggregation; reserved for future use.
+ AggTypeCount // the count aggregation, see Count.
+ AggTypeSum // the sum aggregation, see Sum.
+ AggTypeDistribution // the distribution aggregation, see Distribution.
+ AggTypeLastValue // the last value aggregation, see LastValue.
+)
+
+func (t AggType) String() string {
+ return aggTypeName[t]
+}
+
+var aggTypeName = map[AggType]string{
+ AggTypeNone: "None",
+ AggTypeCount: "Count",
+ AggTypeSum: "Sum",
+ AggTypeDistribution: "Distribution",
+ AggTypeLastValue: "LastValue",
+}
+
+// Aggregation represents a data aggregation method. Use one of the functions:
+// Count, Sum, or Distribution to construct an Aggregation.
+type Aggregation struct {
+ Type AggType // Type is the AggType of this Aggregation.
+ Buckets []float64 // Buckets are the bucket endpoints if this Aggregation represents a distribution, see Distribution.
+
+ newData func() AggregationData
+}
+
+var (
+ aggCount = &Aggregation{
+ Type: AggTypeCount,
+ newData: func() AggregationData {
+ return &CountData{}
+ },
+ }
+ aggSum = &Aggregation{
+ Type: AggTypeSum,
+ newData: func() AggregationData {
+ return &SumData{}
+ },
+ }
+)
+
+// Count indicates that data collected and aggregated
+// with this method will be turned into a count value.
+// For example, total number of accepted requests can be
+// aggregated by using Count.
+func Count() *Aggregation {
+ return aggCount
+}
+
+// Sum indicates that data collected and aggregated
+// with this method will be summed up.
+// For example, accumulated request bytes can be aggregated by using
+// Sum.
+func Sum() *Aggregation {
+ return aggSum
+}
+
+// Distribution indicates that the desired aggregation is
+// a histogram distribution.
+//
+// An distribution aggregation may contain a histogram of the values in the
+// population. The bucket boundaries for that histogram are described
+// by the bounds. This defines len(bounds)+1 buckets.
+//
+// If len(bounds) >= 2 then the boundaries for bucket index i are:
+//
+// [-infinity, bounds[i]) for i = 0
+// [bounds[i-1], bounds[i]) for 0 < i < length
+// [bounds[i-1], +infinity) for i = length
+//
+// If len(bounds) is 0 then there is no histogram associated with the
+// distribution. There will be a single bucket with boundaries
+// (-infinity, +infinity).
+//
+// If len(bounds) is 1 then there is no finite buckets, and that single
+// element is the common boundary of the overflow and underflow buckets.
+func Distribution(bounds ...float64) *Aggregation {
+ return &Aggregation{
+ Type: AggTypeDistribution,
+ Buckets: bounds,
+ newData: func() AggregationData {
+ return newDistributionData(bounds)
+ },
+ }
+}
+
+// LastValue only reports the last value recorded using this
+// aggregation. All other measurements will be dropped.
+func LastValue() *Aggregation {
+ return &Aggregation{
+ Type: AggTypeLastValue,
+ newData: func() AggregationData {
+ return &LastValueData{}
+ },
+ }
+}
diff --git a/vendor/go.opencensus.io/stats/view/aggregation_data.go b/vendor/go.opencensus.io/stats/view/aggregation_data.go
new file mode 100644
index 0000000..960b946
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/aggregation_data.go
@@ -0,0 +1,235 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package view
+
+import (
+ "math"
+
+ "go.opencensus.io/exemplar"
+)
+
+// AggregationData represents an aggregated value from a collection.
+// They are reported on the view data during exporting.
+// Mosts users won't directly access aggregration data.
+type AggregationData interface {
+ isAggregationData() bool
+ addSample(e *exemplar.Exemplar)
+ clone() AggregationData
+ equal(other AggregationData) bool
+}
+
+const epsilon = 1e-9
+
+// CountData is the aggregated data for the Count aggregation.
+// A count aggregation processes data and counts the recordings.
+//
+// Most users won't directly access count data.
+type CountData struct {
+ Value int64
+}
+
+func (a *CountData) isAggregationData() bool { return true }
+
+func (a *CountData) addSample(_ *exemplar.Exemplar) {
+ a.Value = a.Value + 1
+}
+
+func (a *CountData) clone() AggregationData {
+ return &CountData{Value: a.Value}
+}
+
+func (a *CountData) equal(other AggregationData) bool {
+ a2, ok := other.(*CountData)
+ if !ok {
+ return false
+ }
+
+ return a.Value == a2.Value
+}
+
+// SumData is the aggregated data for the Sum aggregation.
+// A sum aggregation processes data and sums up the recordings.
+//
+// Most users won't directly access sum data.
+type SumData struct {
+ Value float64
+}
+
+func (a *SumData) isAggregationData() bool { return true }
+
+func (a *SumData) addSample(e *exemplar.Exemplar) {
+ a.Value += e.Value
+}
+
+func (a *SumData) clone() AggregationData {
+ return &SumData{Value: a.Value}
+}
+
+func (a *SumData) equal(other AggregationData) bool {
+ a2, ok := other.(*SumData)
+ if !ok {
+ return false
+ }
+ return math.Pow(a.Value-a2.Value, 2) < epsilon
+}
+
+// DistributionData is the aggregated data for the
+// Distribution aggregation.
+//
+// Most users won't directly access distribution data.
+//
+// For a distribution with N bounds, the associated DistributionData will have
+// N+1 buckets.
+type DistributionData struct {
+ Count int64 // number of data points aggregated
+ Min float64 // minimum value in the distribution
+ Max float64 // max value in the distribution
+ Mean float64 // mean of the distribution
+ SumOfSquaredDev float64 // sum of the squared deviation from the mean
+ CountPerBucket []int64 // number of occurrences per bucket
+ // ExemplarsPerBucket is slice the same length as CountPerBucket containing
+ // an exemplar for the associated bucket, or nil.
+ ExemplarsPerBucket []*exemplar.Exemplar
+ bounds []float64 // histogram distribution of the values
+}
+
+func newDistributionData(bounds []float64) *DistributionData {
+ bucketCount := len(bounds) + 1
+ return &DistributionData{
+ CountPerBucket: make([]int64, bucketCount),
+ ExemplarsPerBucket: make([]*exemplar.Exemplar, bucketCount),
+ bounds: bounds,
+ Min: math.MaxFloat64,
+ Max: math.SmallestNonzeroFloat64,
+ }
+}
+
+// Sum returns the sum of all samples collected.
+func (a *DistributionData) Sum() float64 { return a.Mean * float64(a.Count) }
+
+func (a *DistributionData) variance() float64 {
+ if a.Count <= 1 {
+ return 0
+ }
+ return a.SumOfSquaredDev / float64(a.Count-1)
+}
+
+func (a *DistributionData) isAggregationData() bool { return true }
+
+func (a *DistributionData) addSample(e *exemplar.Exemplar) {
+ f := e.Value
+ if f < a.Min {
+ a.Min = f
+ }
+ if f > a.Max {
+ a.Max = f
+ }
+ a.Count++
+ a.addToBucket(e)
+
+ if a.Count == 1 {
+ a.Mean = f
+ return
+ }
+
+ oldMean := a.Mean
+ a.Mean = a.Mean + (f-a.Mean)/float64(a.Count)
+ a.SumOfSquaredDev = a.SumOfSquaredDev + (f-oldMean)*(f-a.Mean)
+}
+
+func (a *DistributionData) addToBucket(e *exemplar.Exemplar) {
+ var count *int64
+ var ex **exemplar.Exemplar
+ for i, b := range a.bounds {
+ if e.Value < b {
+ count = &a.CountPerBucket[i]
+ ex = &a.ExemplarsPerBucket[i]
+ break
+ }
+ }
+ if count == nil {
+ count = &a.CountPerBucket[len(a.bounds)]
+ ex = &a.ExemplarsPerBucket[len(a.bounds)]
+ }
+ *count++
+ *ex = maybeRetainExemplar(*ex, e)
+}
+
+func maybeRetainExemplar(old, cur *exemplar.Exemplar) *exemplar.Exemplar {
+ if old == nil {
+ return cur
+ }
+
+ // Heuristic to pick the "better" exemplar: first keep the one with a
+ // sampled trace attachment, if neither have a trace attachment, pick the
+ // one with more attachments.
+ _, haveTraceID := cur.Attachments[exemplar.KeyTraceID]
+ if haveTraceID || len(cur.Attachments) >= len(old.Attachments) {
+ return cur
+ }
+ return old
+}
+
+func (a *DistributionData) clone() AggregationData {
+ c := *a
+ c.CountPerBucket = append([]int64(nil), a.CountPerBucket...)
+ c.ExemplarsPerBucket = append([]*exemplar.Exemplar(nil), a.ExemplarsPerBucket...)
+ return &c
+}
+
+func (a *DistributionData) equal(other AggregationData) bool {
+ a2, ok := other.(*DistributionData)
+ if !ok {
+ return false
+ }
+ if a2 == nil {
+ return false
+ }
+ if len(a.CountPerBucket) != len(a2.CountPerBucket) {
+ return false
+ }
+ for i := range a.CountPerBucket {
+ if a.CountPerBucket[i] != a2.CountPerBucket[i] {
+ return false
+ }
+ }
+ return a.Count == a2.Count && a.Min == a2.Min && a.Max == a2.Max && math.Pow(a.Mean-a2.Mean, 2) < epsilon && math.Pow(a.variance()-a2.variance(), 2) < epsilon
+}
+
+// LastValueData returns the last value recorded for LastValue aggregation.
+type LastValueData struct {
+ Value float64
+}
+
+func (l *LastValueData) isAggregationData() bool {
+ return true
+}
+
+func (l *LastValueData) addSample(e *exemplar.Exemplar) {
+ l.Value = e.Value
+}
+
+func (l *LastValueData) clone() AggregationData {
+ return &LastValueData{l.Value}
+}
+
+func (l *LastValueData) equal(other AggregationData) bool {
+ a2, ok := other.(*LastValueData)
+ if !ok {
+ return false
+ }
+ return l.Value == a2.Value
+}
diff --git a/vendor/go.opencensus.io/stats/view/collector.go b/vendor/go.opencensus.io/stats/view/collector.go
new file mode 100644
index 0000000..32415d4
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/collector.go
@@ -0,0 +1,87 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package view
+
+import (
+ "sort"
+
+ "go.opencensus.io/exemplar"
+
+ "go.opencensus.io/internal/tagencoding"
+ "go.opencensus.io/tag"
+)
+
+type collector struct {
+ // signatures holds the aggregations values for each unique tag signature
+ // (values for all keys) to its aggregator.
+ signatures map[string]AggregationData
+ // Aggregation is the description of the aggregation to perform for this
+ // view.
+ a *Aggregation
+}
+
+func (c *collector) addSample(s string, e *exemplar.Exemplar) {
+ aggregator, ok := c.signatures[s]
+ if !ok {
+ aggregator = c.a.newData()
+ c.signatures[s] = aggregator
+ }
+ aggregator.addSample(e)
+}
+
+// collectRows returns a snapshot of the collected Row values.
+func (c *collector) collectedRows(keys []tag.Key) []*Row {
+ rows := make([]*Row, 0, len(c.signatures))
+ for sig, aggregator := range c.signatures {
+ tags := decodeTags([]byte(sig), keys)
+ row := &Row{Tags: tags, Data: aggregator.clone()}
+ rows = append(rows, row)
+ }
+ return rows
+}
+
+func (c *collector) clearRows() {
+ c.signatures = make(map[string]AggregationData)
+}
+
+// encodeWithKeys encodes the map by using values
+// only associated with the keys provided.
+func encodeWithKeys(m *tag.Map, keys []tag.Key) []byte {
+ vb := &tagencoding.Values{
+ Buffer: make([]byte, len(keys)),
+ }
+ for _, k := range keys {
+ v, _ := m.Value(k)
+ vb.WriteValue([]byte(v))
+ }
+ return vb.Bytes()
+}
+
+// decodeTags decodes tags from the buffer and
+// orders them by the keys.
+func decodeTags(buf []byte, keys []tag.Key) []tag.Tag {
+ vb := &tagencoding.Values{Buffer: buf}
+ var tags []tag.Tag
+ for _, k := range keys {
+ v := vb.ReadValue()
+ if v != nil {
+ tags = append(tags, tag.Tag{Key: k, Value: string(v)})
+ }
+ }
+ vb.ReadIndex = 0
+ sort.Slice(tags, func(i, j int) bool { return tags[i].Key.Name() < tags[j].Key.Name() })
+ return tags
+}
diff --git a/vendor/go.opencensus.io/stats/view/doc.go b/vendor/go.opencensus.io/stats/view/doc.go
new file mode 100644
index 0000000..dced225
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/doc.go
@@ -0,0 +1,47 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Package view contains support for collecting and exposing aggregates over stats.
+//
+// In order to collect measurements, views need to be defined and registered.
+// A view allows recorded measurements to be filtered and aggregated.
+//
+// All recorded measurements can be grouped by a list of tags.
+//
+// OpenCensus provides several aggregation methods: Count, Distribution and Sum.
+//
+// Count only counts the number of measurement points recorded.
+// Distribution provides statistical summary of the aggregated data by counting
+// how many recorded measurements fall into each bucket.
+// Sum adds up the measurement values.
+// LastValue just keeps track of the most recently recorded measurement value.
+// All aggregations are cumulative.
+//
+// Views can be registerd and unregistered at any time during program execution.
+//
+// Libraries can define views but it is recommended that in most cases registering
+// views be left up to applications.
+//
+// Exporting
+//
+// Collected and aggregated data can be exported to a metric collection
+// backend by registering its exporter.
+//
+// Multiple exporters can be registered to upload the data to various
+// different back ends.
+package view // import "go.opencensus.io/stats/view"
+
+// TODO(acetechnologist): Add a link to the language independent OpenCensus
+// spec when it is available.
diff --git a/vendor/go.opencensus.io/stats/view/export.go b/vendor/go.opencensus.io/stats/view/export.go
new file mode 100644
index 0000000..7cb5971
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/export.go
@@ -0,0 +1,58 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package view
+
+import "sync"
+
+var (
+ exportersMu sync.RWMutex // guards exporters
+ exporters = make(map[Exporter]struct{})
+)
+
+// Exporter exports the collected records as view data.
+//
+// The ExportView method should return quickly; if an
+// Exporter takes a significant amount of time to
+// process a Data, that work should be done on another goroutine.
+//
+// It is safe to assume that ExportView will not be called concurrently from
+// multiple goroutines.
+//
+// The Data should not be modified.
+type Exporter interface {
+ ExportView(viewData *Data)
+}
+
+// RegisterExporter registers an exporter.
+// Collected data will be reported via all the
+// registered exporters. Once you no longer
+// want data to be exported, invoke UnregisterExporter
+// with the previously registered exporter.
+//
+// Binaries can register exporters, libraries shouldn't register exporters.
+func RegisterExporter(e Exporter) {
+ exportersMu.Lock()
+ defer exportersMu.Unlock()
+
+ exporters[e] = struct{}{}
+}
+
+// UnregisterExporter unregisters an exporter.
+func UnregisterExporter(e Exporter) {
+ exportersMu.Lock()
+ defer exportersMu.Unlock()
+
+ delete(exporters, e)
+}
diff --git a/vendor/go.opencensus.io/stats/view/view.go b/vendor/go.opencensus.io/stats/view/view.go
new file mode 100644
index 0000000..c2a08af
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/view.go
@@ -0,0 +1,185 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package view
+
+import (
+ "bytes"
+ "fmt"
+ "reflect"
+ "sort"
+ "sync/atomic"
+ "time"
+
+ "go.opencensus.io/exemplar"
+
+ "go.opencensus.io/stats"
+ "go.opencensus.io/stats/internal"
+ "go.opencensus.io/tag"
+)
+
+// View allows users to aggregate the recorded stats.Measurements.
+// Views need to be passed to the Register function to be before data will be
+// collected and sent to Exporters.
+type View struct {
+ Name string // Name of View. Must be unique. If unset, will default to the name of the Measure.
+ Description string // Description is a human-readable description for this view.
+
+ // TagKeys are the tag keys describing the grouping of this view.
+ // A single Row will be produced for each combination of associated tag values.
+ TagKeys []tag.Key
+
+ // Measure is a stats.Measure to aggregate in this view.
+ Measure stats.Measure
+
+ // Aggregation is the aggregation function tp apply to the set of Measurements.
+ Aggregation *Aggregation
+}
+
+// WithName returns a copy of the View with a new name. This is useful for
+// renaming views to cope with limitations placed on metric names by various
+// backends.
+func (v *View) WithName(name string) *View {
+ vNew := *v
+ vNew.Name = name
+ return &vNew
+}
+
+// same compares two views and returns true if they represent the same aggregation.
+func (v *View) same(other *View) bool {
+ if v == other {
+ return true
+ }
+ if v == nil {
+ return false
+ }
+ return reflect.DeepEqual(v.Aggregation, other.Aggregation) &&
+ v.Measure.Name() == other.Measure.Name()
+}
+
+// canonicalize canonicalizes v by setting explicit
+// defaults for Name and Description and sorting the TagKeys
+func (v *View) canonicalize() error {
+ if v.Measure == nil {
+ return fmt.Errorf("cannot register view %q: measure not set", v.Name)
+ }
+ if v.Aggregation == nil {
+ return fmt.Errorf("cannot register view %q: aggregation not set", v.Name)
+ }
+ if v.Name == "" {
+ v.Name = v.Measure.Name()
+ }
+ if v.Description == "" {
+ v.Description = v.Measure.Description()
+ }
+ if err := checkViewName(v.Name); err != nil {
+ return err
+ }
+ sort.Slice(v.TagKeys, func(i, j int) bool {
+ return v.TagKeys[i].Name() < v.TagKeys[j].Name()
+ })
+ return nil
+}
+
+// viewInternal is the internal representation of a View.
+type viewInternal struct {
+ view *View // view is the canonicalized View definition associated with this view.
+ subscribed uint32 // 1 if someone is subscribed and data need to be exported, use atomic to access
+ collector *collector
+}
+
+func newViewInternal(v *View) (*viewInternal, error) {
+ return &viewInternal{
+ view: v,
+ collector: &collector{make(map[string]AggregationData), v.Aggregation},
+ }, nil
+}
+
+func (v *viewInternal) subscribe() {
+ atomic.StoreUint32(&v.subscribed, 1)
+}
+
+func (v *viewInternal) unsubscribe() {
+ atomic.StoreUint32(&v.subscribed, 0)
+}
+
+// isSubscribed returns true if the view is exporting
+// data by subscription.
+func (v *viewInternal) isSubscribed() bool {
+ return atomic.LoadUint32(&v.subscribed) == 1
+}
+
+func (v *viewInternal) clearRows() {
+ v.collector.clearRows()
+}
+
+func (v *viewInternal) collectedRows() []*Row {
+ return v.collector.collectedRows(v.view.TagKeys)
+}
+
+func (v *viewInternal) addSample(m *tag.Map, e *exemplar.Exemplar) {
+ if !v.isSubscribed() {
+ return
+ }
+ sig := string(encodeWithKeys(m, v.view.TagKeys))
+ v.collector.addSample(sig, e)
+}
+
+// A Data is a set of rows about usage of the single measure associated
+// with the given view. Each row is specific to a unique set of tags.
+type Data struct {
+ View *View
+ Start, End time.Time
+ Rows []*Row
+}
+
+// Row is the collected value for a specific set of key value pairs a.k.a tags.
+type Row struct {
+ Tags []tag.Tag
+ Data AggregationData
+}
+
+func (r *Row) String() string {
+ var buffer bytes.Buffer
+ buffer.WriteString("{ ")
+ buffer.WriteString("{ ")
+ for _, t := range r.Tags {
+ buffer.WriteString(fmt.Sprintf("{%v %v}", t.Key.Name(), t.Value))
+ }
+ buffer.WriteString(" }")
+ buffer.WriteString(fmt.Sprintf("%v", r.Data))
+ buffer.WriteString(" }")
+ return buffer.String()
+}
+
+// Equal returns true if both rows are equal. Tags are expected to be ordered
+// by the key name. Even both rows have the same tags but the tags appear in
+// different orders it will return false.
+func (r *Row) Equal(other *Row) bool {
+ if r == other {
+ return true
+ }
+ return reflect.DeepEqual(r.Tags, other.Tags) && r.Data.equal(other.Data)
+}
+
+func checkViewName(name string) error {
+ if len(name) > internal.MaxNameLength {
+ return fmt.Errorf("view name cannot be larger than %v", internal.MaxNameLength)
+ }
+ if !internal.IsPrintable(name) {
+ return fmt.Errorf("view name needs to be an ASCII string")
+ }
+ return nil
+}
diff --git a/vendor/go.opencensus.io/stats/view/worker.go b/vendor/go.opencensus.io/stats/view/worker.go
new file mode 100644
index 0000000..63b0ee3
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/worker.go
@@ -0,0 +1,229 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package view
+
+import (
+ "fmt"
+ "time"
+
+ "go.opencensus.io/stats"
+ "go.opencensus.io/stats/internal"
+ "go.opencensus.io/tag"
+)
+
+func init() {
+ defaultWorker = newWorker()
+ go defaultWorker.start()
+ internal.DefaultRecorder = record
+}
+
+type measureRef struct {
+ measure string
+ views map[*viewInternal]struct{}
+}
+
+type worker struct {
+ measures map[string]*measureRef
+ views map[string]*viewInternal
+ startTimes map[*viewInternal]time.Time
+
+ timer *time.Ticker
+ c chan command
+ quit, done chan bool
+}
+
+var defaultWorker *worker
+
+var defaultReportingDuration = 10 * time.Second
+
+// Find returns a registered view associated with this name.
+// If no registered view is found, nil is returned.
+func Find(name string) (v *View) {
+ req := &getViewByNameReq{
+ name: name,
+ c: make(chan *getViewByNameResp),
+ }
+ defaultWorker.c <- req
+ resp := <-req.c
+ return resp.v
+}
+
+// Register begins collecting data for the given views.
+// Once a view is registered, it reports data to the registered exporters.
+func Register(views ...*View) error {
+ for _, v := range views {
+ if err := v.canonicalize(); err != nil {
+ return err
+ }
+ }
+ req := ®isterViewReq{
+ views: views,
+ err: make(chan error),
+ }
+ defaultWorker.c <- req
+ return <-req.err
+}
+
+// Unregister the given views. Data will not longer be exported for these views
+// after Unregister returns.
+// It is not necessary to unregister from views you expect to collect for the
+// duration of your program execution.
+func Unregister(views ...*View) {
+ names := make([]string, len(views))
+ for i := range views {
+ names[i] = views[i].Name
+ }
+ req := &unregisterFromViewReq{
+ views: names,
+ done: make(chan struct{}),
+ }
+ defaultWorker.c <- req
+ <-req.done
+}
+
+// RetrieveData gets a snapshot of the data collected for the the view registered
+// with the given name. It is intended for testing only.
+func RetrieveData(viewName string) ([]*Row, error) {
+ req := &retrieveDataReq{
+ now: time.Now(),
+ v: viewName,
+ c: make(chan *retrieveDataResp),
+ }
+ defaultWorker.c <- req
+ resp := <-req.c
+ return resp.rows, resp.err
+}
+
+func record(tags *tag.Map, ms interface{}, attachments map[string]string) {
+ req := &recordReq{
+ tm: tags,
+ ms: ms.([]stats.Measurement),
+ attachments: attachments,
+ t: time.Now(),
+ }
+ defaultWorker.c <- req
+}
+
+// SetReportingPeriod sets the interval between reporting aggregated views in
+// the program. If duration is less than or equal to zero, it enables the
+// default behavior.
+//
+// Note: each exporter makes different promises about what the lowest supported
+// duration is. For example, the Stackdriver exporter recommends a value no
+// lower than 1 minute. Consult each exporter per your needs.
+func SetReportingPeriod(d time.Duration) {
+ // TODO(acetechnologist): ensure that the duration d is more than a certain
+ // value. e.g. 1s
+ req := &setReportingPeriodReq{
+ d: d,
+ c: make(chan bool),
+ }
+ defaultWorker.c <- req
+ <-req.c // don't return until the timer is set to the new duration.
+}
+
+func newWorker() *worker {
+ return &worker{
+ measures: make(map[string]*measureRef),
+ views: make(map[string]*viewInternal),
+ startTimes: make(map[*viewInternal]time.Time),
+ timer: time.NewTicker(defaultReportingDuration),
+ c: make(chan command, 1024),
+ quit: make(chan bool),
+ done: make(chan bool),
+ }
+}
+
+func (w *worker) start() {
+ for {
+ select {
+ case cmd := <-w.c:
+ cmd.handleCommand(w)
+ case <-w.timer.C:
+ w.reportUsage(time.Now())
+ case <-w.quit:
+ w.timer.Stop()
+ close(w.c)
+ w.done <- true
+ return
+ }
+ }
+}
+
+func (w *worker) stop() {
+ w.quit <- true
+ <-w.done
+}
+
+func (w *worker) getMeasureRef(name string) *measureRef {
+ if mr, ok := w.measures[name]; ok {
+ return mr
+ }
+ mr := &measureRef{
+ measure: name,
+ views: make(map[*viewInternal]struct{}),
+ }
+ w.measures[name] = mr
+ return mr
+}
+
+func (w *worker) tryRegisterView(v *View) (*viewInternal, error) {
+ vi, err := newViewInternal(v)
+ if err != nil {
+ return nil, err
+ }
+ if x, ok := w.views[vi.view.Name]; ok {
+ if !x.view.same(vi.view) {
+ return nil, fmt.Errorf("cannot register view %q; a different view with the same name is already registered", v.Name)
+ }
+
+ // the view is already registered so there is nothing to do and the
+ // command is considered successful.
+ return x, nil
+ }
+ w.views[vi.view.Name] = vi
+ ref := w.getMeasureRef(vi.view.Measure.Name())
+ ref.views[vi] = struct{}{}
+ return vi, nil
+}
+
+func (w *worker) reportView(v *viewInternal, now time.Time) {
+ if !v.isSubscribed() {
+ return
+ }
+ rows := v.collectedRows()
+ _, ok := w.startTimes[v]
+ if !ok {
+ w.startTimes[v] = now
+ }
+ viewData := &Data{
+ View: v.view,
+ Start: w.startTimes[v],
+ End: time.Now(),
+ Rows: rows,
+ }
+ exportersMu.Lock()
+ for e := range exporters {
+ e.ExportView(viewData)
+ }
+ exportersMu.Unlock()
+}
+
+func (w *worker) reportUsage(now time.Time) {
+ for _, v := range w.views {
+ w.reportView(v, now)
+ }
+}
diff --git a/vendor/go.opencensus.io/stats/view/worker_commands.go b/vendor/go.opencensus.io/stats/view/worker_commands.go
new file mode 100644
index 0000000..b38f26f
--- /dev/null
+++ b/vendor/go.opencensus.io/stats/view/worker_commands.go
@@ -0,0 +1,183 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package view
+
+import (
+ "errors"
+ "fmt"
+ "strings"
+ "time"
+
+ "go.opencensus.io/exemplar"
+
+ "go.opencensus.io/stats"
+ "go.opencensus.io/stats/internal"
+ "go.opencensus.io/tag"
+)
+
+type command interface {
+ handleCommand(w *worker)
+}
+
+// getViewByNameReq is the command to get a view given its name.
+type getViewByNameReq struct {
+ name string
+ c chan *getViewByNameResp
+}
+
+type getViewByNameResp struct {
+ v *View
+}
+
+func (cmd *getViewByNameReq) handleCommand(w *worker) {
+ v := w.views[cmd.name]
+ if v == nil {
+ cmd.c <- &getViewByNameResp{nil}
+ return
+ }
+ cmd.c <- &getViewByNameResp{v.view}
+}
+
+// registerViewReq is the command to register a view.
+type registerViewReq struct {
+ views []*View
+ err chan error
+}
+
+func (cmd *registerViewReq) handleCommand(w *worker) {
+ var errstr []string
+ for _, view := range cmd.views {
+ vi, err := w.tryRegisterView(view)
+ if err != nil {
+ errstr = append(errstr, fmt.Sprintf("%s: %v", view.Name, err))
+ continue
+ }
+ internal.SubscriptionReporter(view.Measure.Name())
+ vi.subscribe()
+ }
+ if len(errstr) > 0 {
+ cmd.err <- errors.New(strings.Join(errstr, "\n"))
+ } else {
+ cmd.err <- nil
+ }
+}
+
+// unregisterFromViewReq is the command to unregister to a view. Has no
+// impact on the data collection for client that are pulling data from the
+// library.
+type unregisterFromViewReq struct {
+ views []string
+ done chan struct{}
+}
+
+func (cmd *unregisterFromViewReq) handleCommand(w *worker) {
+ for _, name := range cmd.views {
+ vi, ok := w.views[name]
+ if !ok {
+ continue
+ }
+
+ // Report pending data for this view before removing it.
+ w.reportView(vi, time.Now())
+
+ vi.unsubscribe()
+ if !vi.isSubscribed() {
+ // this was the last subscription and view is not collecting anymore.
+ // The collected data can be cleared.
+ vi.clearRows()
+ }
+ delete(w.views, name)
+ }
+ cmd.done <- struct{}{}
+}
+
+// retrieveDataReq is the command to retrieve data for a view.
+type retrieveDataReq struct {
+ now time.Time
+ v string
+ c chan *retrieveDataResp
+}
+
+type retrieveDataResp struct {
+ rows []*Row
+ err error
+}
+
+func (cmd *retrieveDataReq) handleCommand(w *worker) {
+ vi, ok := w.views[cmd.v]
+ if !ok {
+ cmd.c <- &retrieveDataResp{
+ nil,
+ fmt.Errorf("cannot retrieve data; view %q is not registered", cmd.v),
+ }
+ return
+ }
+
+ if !vi.isSubscribed() {
+ cmd.c <- &retrieveDataResp{
+ nil,
+ fmt.Errorf("cannot retrieve data; view %q has no subscriptions or collection is not forcibly started", cmd.v),
+ }
+ return
+ }
+ cmd.c <- &retrieveDataResp{
+ vi.collectedRows(),
+ nil,
+ }
+}
+
+// recordReq is the command to record data related to multiple measures
+// at once.
+type recordReq struct {
+ tm *tag.Map
+ ms []stats.Measurement
+ attachments map[string]string
+ t time.Time
+}
+
+func (cmd *recordReq) handleCommand(w *worker) {
+ for _, m := range cmd.ms {
+ if (m == stats.Measurement{}) { // not registered
+ continue
+ }
+ ref := w.getMeasureRef(m.Measure().Name())
+ for v := range ref.views {
+ e := &exemplar.Exemplar{
+ Value: m.Value(),
+ Timestamp: cmd.t,
+ Attachments: cmd.attachments,
+ }
+ v.addSample(cmd.tm, e)
+ }
+ }
+}
+
+// setReportingPeriodReq is the command to modify the duration between
+// reporting the collected data to the registered clients.
+type setReportingPeriodReq struct {
+ d time.Duration
+ c chan bool
+}
+
+func (cmd *setReportingPeriodReq) handleCommand(w *worker) {
+ w.timer.Stop()
+ if cmd.d <= 0 {
+ w.timer = time.NewTicker(defaultReportingDuration)
+ } else {
+ w.timer = time.NewTicker(cmd.d)
+ }
+ cmd.c <- true
+}
diff --git a/vendor/go.opencensus.io/tag/context.go b/vendor/go.opencensus.io/tag/context.go
new file mode 100644
index 0000000..dcc13f4
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/context.go
@@ -0,0 +1,67 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package tag
+
+import (
+ "context"
+
+ "go.opencensus.io/exemplar"
+)
+
+// FromContext returns the tag map stored in the context.
+func FromContext(ctx context.Context) *Map {
+ // The returned tag map shouldn't be mutated.
+ ts := ctx.Value(mapCtxKey)
+ if ts == nil {
+ return nil
+ }
+ return ts.(*Map)
+}
+
+// NewContext creates a new context with the given tag map.
+// To propagate a tag map to downstream methods and downstream RPCs, add a tag map
+// to the current context. NewContext will return a copy of the current context,
+// and put the tag map into the returned one.
+// If there is already a tag map in the current context, it will be replaced with m.
+func NewContext(ctx context.Context, m *Map) context.Context {
+ return context.WithValue(ctx, mapCtxKey, m)
+}
+
+type ctxKey struct{}
+
+var mapCtxKey = ctxKey{}
+
+func init() {
+ exemplar.RegisterAttachmentExtractor(extractTagsAttachments)
+}
+
+func extractTagsAttachments(ctx context.Context, a exemplar.Attachments) exemplar.Attachments {
+ m := FromContext(ctx)
+ if m == nil {
+ return a
+ }
+ if len(m.m) == 0 {
+ return a
+ }
+ if a == nil {
+ a = make(map[string]string)
+ }
+
+ for k, v := range m.m {
+ a[exemplar.KeyPrefixTag+k.Name()] = v
+ }
+ return a
+}
diff --git a/vendor/go.opencensus.io/tag/doc.go b/vendor/go.opencensus.io/tag/doc.go
new file mode 100644
index 0000000..da16b74
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/doc.go
@@ -0,0 +1,26 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+/*
+Package tag contains OpenCensus tags.
+
+Tags are key-value pairs. Tags provide additional cardinality to
+the OpenCensus instrumentation data.
+
+Tags can be propagated on the wire and in the same
+process via context.Context. Encode and Decode should be
+used to represent tags into their binary propagation form.
+*/
+package tag // import "go.opencensus.io/tag"
diff --git a/vendor/go.opencensus.io/tag/key.go b/vendor/go.opencensus.io/tag/key.go
new file mode 100644
index 0000000..ebbed95
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/key.go
@@ -0,0 +1,35 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package tag
+
+// Key represents a tag key.
+type Key struct {
+ name string
+}
+
+// NewKey creates or retrieves a string key identified by name.
+// Calling NewKey consequently with the same name returns the same key.
+func NewKey(name string) (Key, error) {
+ if !checkKeyName(name) {
+ return Key{}, errInvalidKeyName
+ }
+ return Key{name: name}, nil
+}
+
+// Name returns the name of the key.
+func (k Key) Name() string {
+ return k.name
+}
diff --git a/vendor/go.opencensus.io/tag/map.go b/vendor/go.opencensus.io/tag/map.go
new file mode 100644
index 0000000..5b72ba6
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/map.go
@@ -0,0 +1,197 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package tag
+
+import (
+ "bytes"
+ "context"
+ "fmt"
+ "sort"
+)
+
+// Tag is a key value pair that can be propagated on wire.
+type Tag struct {
+ Key Key
+ Value string
+}
+
+// Map is a map of tags. Use New to create a context containing
+// a new Map.
+type Map struct {
+ m map[Key]string
+}
+
+// Value returns the value for the key if a value for the key exists.
+func (m *Map) Value(k Key) (string, bool) {
+ if m == nil {
+ return "", false
+ }
+ v, ok := m.m[k]
+ return v, ok
+}
+
+func (m *Map) String() string {
+ if m == nil {
+ return "nil"
+ }
+ keys := make([]Key, 0, len(m.m))
+ for k := range m.m {
+ keys = append(keys, k)
+ }
+ sort.Slice(keys, func(i, j int) bool { return keys[i].Name() < keys[j].Name() })
+
+ var buffer bytes.Buffer
+ buffer.WriteString("{ ")
+ for _, k := range keys {
+ buffer.WriteString(fmt.Sprintf("{%v %v}", k.name, m.m[k]))
+ }
+ buffer.WriteString(" }")
+ return buffer.String()
+}
+
+func (m *Map) insert(k Key, v string) {
+ if _, ok := m.m[k]; ok {
+ return
+ }
+ m.m[k] = v
+}
+
+func (m *Map) update(k Key, v string) {
+ if _, ok := m.m[k]; ok {
+ m.m[k] = v
+ }
+}
+
+func (m *Map) upsert(k Key, v string) {
+ m.m[k] = v
+}
+
+func (m *Map) delete(k Key) {
+ delete(m.m, k)
+}
+
+func newMap() *Map {
+ return &Map{m: make(map[Key]string)}
+}
+
+// Mutator modifies a tag map.
+type Mutator interface {
+ Mutate(t *Map) (*Map, error)
+}
+
+// Insert returns a mutator that inserts a
+// value associated with k. If k already exists in the tag map,
+// mutator doesn't update the value.
+func Insert(k Key, v string) Mutator {
+ return &mutator{
+ fn: func(m *Map) (*Map, error) {
+ if !checkValue(v) {
+ return nil, errInvalidValue
+ }
+ m.insert(k, v)
+ return m, nil
+ },
+ }
+}
+
+// Update returns a mutator that updates the
+// value of the tag associated with k with v. If k doesn't
+// exists in the tag map, the mutator doesn't insert the value.
+func Update(k Key, v string) Mutator {
+ return &mutator{
+ fn: func(m *Map) (*Map, error) {
+ if !checkValue(v) {
+ return nil, errInvalidValue
+ }
+ m.update(k, v)
+ return m, nil
+ },
+ }
+}
+
+// Upsert returns a mutator that upserts the
+// value of the tag associated with k with v. It inserts the
+// value if k doesn't exist already. It mutates the value
+// if k already exists.
+func Upsert(k Key, v string) Mutator {
+ return &mutator{
+ fn: func(m *Map) (*Map, error) {
+ if !checkValue(v) {
+ return nil, errInvalidValue
+ }
+ m.upsert(k, v)
+ return m, nil
+ },
+ }
+}
+
+// Delete returns a mutator that deletes
+// the value associated with k.
+func Delete(k Key) Mutator {
+ return &mutator{
+ fn: func(m *Map) (*Map, error) {
+ m.delete(k)
+ return m, nil
+ },
+ }
+}
+
+// New returns a new context that contains a tag map
+// originated from the incoming context and modified
+// with the provided mutators.
+func New(ctx context.Context, mutator ...Mutator) (context.Context, error) {
+ m := newMap()
+ orig := FromContext(ctx)
+ if orig != nil {
+ for k, v := range orig.m {
+ if !checkKeyName(k.Name()) {
+ return ctx, fmt.Errorf("key:%q: %v", k, errInvalidKeyName)
+ }
+ if !checkValue(v) {
+ return ctx, fmt.Errorf("key:%q value:%q: %v", k.Name(), v, errInvalidValue)
+ }
+ m.insert(k, v)
+ }
+ }
+ var err error
+ for _, mod := range mutator {
+ m, err = mod.Mutate(m)
+ if err != nil {
+ return ctx, err
+ }
+ }
+ return NewContext(ctx, m), nil
+}
+
+// Do is similar to pprof.Do: a convenience for installing the tags
+// from the context as Go profiler labels. This allows you to
+// correlated runtime profiling with stats.
+//
+// It converts the key/values from the given map to Go profiler labels
+// and calls pprof.Do.
+//
+// Do is going to do nothing if your Go version is below 1.9.
+func Do(ctx context.Context, f func(ctx context.Context)) {
+ do(ctx, f)
+}
+
+type mutator struct {
+ fn func(t *Map) (*Map, error)
+}
+
+func (m *mutator) Mutate(t *Map) (*Map, error) {
+ return m.fn(t)
+}
diff --git a/vendor/go.opencensus.io/tag/map_codec.go b/vendor/go.opencensus.io/tag/map_codec.go
new file mode 100644
index 0000000..3e99895
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/map_codec.go
@@ -0,0 +1,234 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package tag
+
+import (
+ "encoding/binary"
+ "fmt"
+)
+
+// KeyType defines the types of keys allowed. Currently only keyTypeString is
+// supported.
+type keyType byte
+
+const (
+ keyTypeString keyType = iota
+ keyTypeInt64
+ keyTypeTrue
+ keyTypeFalse
+
+ tagsVersionID = byte(0)
+)
+
+type encoderGRPC struct {
+ buf []byte
+ writeIdx, readIdx int
+}
+
+// writeKeyString writes the fieldID '0' followed by the key string and value
+// string.
+func (eg *encoderGRPC) writeTagString(k, v string) {
+ eg.writeByte(byte(keyTypeString))
+ eg.writeStringWithVarintLen(k)
+ eg.writeStringWithVarintLen(v)
+}
+
+func (eg *encoderGRPC) writeTagUint64(k string, i uint64) {
+ eg.writeByte(byte(keyTypeInt64))
+ eg.writeStringWithVarintLen(k)
+ eg.writeUint64(i)
+}
+
+func (eg *encoderGRPC) writeTagTrue(k string) {
+ eg.writeByte(byte(keyTypeTrue))
+ eg.writeStringWithVarintLen(k)
+}
+
+func (eg *encoderGRPC) writeTagFalse(k string) {
+ eg.writeByte(byte(keyTypeFalse))
+ eg.writeStringWithVarintLen(k)
+}
+
+func (eg *encoderGRPC) writeBytesWithVarintLen(bytes []byte) {
+ length := len(bytes)
+
+ eg.growIfRequired(binary.MaxVarintLen64 + length)
+ eg.writeIdx += binary.PutUvarint(eg.buf[eg.writeIdx:], uint64(length))
+ copy(eg.buf[eg.writeIdx:], bytes)
+ eg.writeIdx += length
+}
+
+func (eg *encoderGRPC) writeStringWithVarintLen(s string) {
+ length := len(s)
+
+ eg.growIfRequired(binary.MaxVarintLen64 + length)
+ eg.writeIdx += binary.PutUvarint(eg.buf[eg.writeIdx:], uint64(length))
+ copy(eg.buf[eg.writeIdx:], s)
+ eg.writeIdx += length
+}
+
+func (eg *encoderGRPC) writeByte(v byte) {
+ eg.growIfRequired(1)
+ eg.buf[eg.writeIdx] = v
+ eg.writeIdx++
+}
+
+func (eg *encoderGRPC) writeUint32(i uint32) {
+ eg.growIfRequired(4)
+ binary.LittleEndian.PutUint32(eg.buf[eg.writeIdx:], i)
+ eg.writeIdx += 4
+}
+
+func (eg *encoderGRPC) writeUint64(i uint64) {
+ eg.growIfRequired(8)
+ binary.LittleEndian.PutUint64(eg.buf[eg.writeIdx:], i)
+ eg.writeIdx += 8
+}
+
+func (eg *encoderGRPC) readByte() byte {
+ b := eg.buf[eg.readIdx]
+ eg.readIdx++
+ return b
+}
+
+func (eg *encoderGRPC) readUint32() uint32 {
+ i := binary.LittleEndian.Uint32(eg.buf[eg.readIdx:])
+ eg.readIdx += 4
+ return i
+}
+
+func (eg *encoderGRPC) readUint64() uint64 {
+ i := binary.LittleEndian.Uint64(eg.buf[eg.readIdx:])
+ eg.readIdx += 8
+ return i
+}
+
+func (eg *encoderGRPC) readBytesWithVarintLen() ([]byte, error) {
+ if eg.readEnded() {
+ return nil, fmt.Errorf("unexpected end while readBytesWithVarintLen '%x' starting at idx '%v'", eg.buf, eg.readIdx)
+ }
+ length, valueStart := binary.Uvarint(eg.buf[eg.readIdx:])
+ if valueStart <= 0 {
+ return nil, fmt.Errorf("unexpected end while readBytesWithVarintLen '%x' starting at idx '%v'", eg.buf, eg.readIdx)
+ }
+
+ valueStart += eg.readIdx
+ valueEnd := valueStart + int(length)
+ if valueEnd > len(eg.buf) {
+ return nil, fmt.Errorf("malformed encoding: length:%v, upper:%v, maxLength:%v", length, valueEnd, len(eg.buf))
+ }
+
+ eg.readIdx = valueEnd
+ return eg.buf[valueStart:valueEnd], nil
+}
+
+func (eg *encoderGRPC) readStringWithVarintLen() (string, error) {
+ bytes, err := eg.readBytesWithVarintLen()
+ if err != nil {
+ return "", err
+ }
+ return string(bytes), nil
+}
+
+func (eg *encoderGRPC) growIfRequired(expected int) {
+ if len(eg.buf)-eg.writeIdx < expected {
+ tmp := make([]byte, 2*(len(eg.buf)+1)+expected)
+ copy(tmp, eg.buf)
+ eg.buf = tmp
+ }
+}
+
+func (eg *encoderGRPC) readEnded() bool {
+ return eg.readIdx >= len(eg.buf)
+}
+
+func (eg *encoderGRPC) bytes() []byte {
+ return eg.buf[:eg.writeIdx]
+}
+
+// Encode encodes the tag map into a []byte. It is useful to propagate
+// the tag maps on wire in binary format.
+func Encode(m *Map) []byte {
+ eg := &encoderGRPC{
+ buf: make([]byte, len(m.m)),
+ }
+ eg.writeByte(byte(tagsVersionID))
+ for k, v := range m.m {
+ eg.writeByte(byte(keyTypeString))
+ eg.writeStringWithVarintLen(k.name)
+ eg.writeBytesWithVarintLen([]byte(v))
+ }
+ return eg.bytes()
+}
+
+// Decode decodes the given []byte into a tag map.
+func Decode(bytes []byte) (*Map, error) {
+ ts := newMap()
+ err := DecodeEach(bytes, ts.upsert)
+ if err != nil {
+ // no partial failures
+ return nil, err
+ }
+ return ts, nil
+}
+
+// DecodeEach decodes the given serialized tag map, calling handler for each
+// tag key and value decoded.
+func DecodeEach(bytes []byte, fn func(key Key, val string)) error {
+ eg := &encoderGRPC{
+ buf: bytes,
+ }
+ if len(eg.buf) == 0 {
+ return nil
+ }
+
+ version := eg.readByte()
+ if version > tagsVersionID {
+ return fmt.Errorf("cannot decode: unsupported version: %q; supports only up to: %q", version, tagsVersionID)
+ }
+
+ for !eg.readEnded() {
+ typ := keyType(eg.readByte())
+
+ if typ != keyTypeString {
+ return fmt.Errorf("cannot decode: invalid key type: %q", typ)
+ }
+
+ k, err := eg.readBytesWithVarintLen()
+ if err != nil {
+ return err
+ }
+
+ v, err := eg.readBytesWithVarintLen()
+ if err != nil {
+ return err
+ }
+
+ key, err := NewKey(string(k))
+ if err != nil {
+ return err
+ }
+ val := string(v)
+ if !checkValue(val) {
+ return errInvalidValue
+ }
+ fn(key, val)
+ if err != nil {
+ return err
+ }
+ }
+ return nil
+}
diff --git a/vendor/go.opencensus.io/tag/profile_19.go b/vendor/go.opencensus.io/tag/profile_19.go
new file mode 100644
index 0000000..f81cd0b
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/profile_19.go
@@ -0,0 +1,31 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.9
+
+package tag
+
+import (
+ "context"
+ "runtime/pprof"
+)
+
+func do(ctx context.Context, f func(ctx context.Context)) {
+ m := FromContext(ctx)
+ keyvals := make([]string, 0, 2*len(m.m))
+ for k, v := range m.m {
+ keyvals = append(keyvals, k.Name(), v)
+ }
+ pprof.Do(ctx, pprof.Labels(keyvals...), f)
+}
diff --git a/vendor/go.opencensus.io/tag/profile_not19.go b/vendor/go.opencensus.io/tag/profile_not19.go
new file mode 100644
index 0000000..83adbce
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/profile_not19.go
@@ -0,0 +1,23 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !go1.9
+
+package tag
+
+import "context"
+
+func do(ctx context.Context, f func(ctx context.Context)) {
+ f(ctx)
+}
diff --git a/vendor/go.opencensus.io/tag/validate.go b/vendor/go.opencensus.io/tag/validate.go
new file mode 100644
index 0000000..0939fc6
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/validate.go
@@ -0,0 +1,56 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tag
+
+import "errors"
+
+const (
+ maxKeyLength = 255
+
+ // valid are restricted to US-ASCII subset (range 0x20 (' ') to 0x7e ('~')).
+ validKeyValueMin = 32
+ validKeyValueMax = 126
+)
+
+var (
+ errInvalidKeyName = errors.New("invalid key name: only ASCII characters accepted; max length must be 255 characters")
+ errInvalidValue = errors.New("invalid value: only ASCII characters accepted; max length must be 255 characters")
+)
+
+func checkKeyName(name string) bool {
+ if len(name) == 0 {
+ return false
+ }
+ if len(name) > maxKeyLength {
+ return false
+ }
+ return isASCII(name)
+}
+
+func isASCII(s string) bool {
+ for _, c := range s {
+ if (c < validKeyValueMin) || (c > validKeyValueMax) {
+ return false
+ }
+ }
+ return true
+}
+
+func checkValue(v string) bool {
+ if len(v) > maxKeyLength {
+ return false
+ }
+ return isASCII(v)
+}
diff --git a/vendor/go.opencensus.io/trace/basetypes.go b/vendor/go.opencensus.io/trace/basetypes.go
new file mode 100644
index 0000000..01f0f90
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/basetypes.go
@@ -0,0 +1,114 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "fmt"
+ "time"
+)
+
+type (
+ // TraceID is a 16-byte identifier for a set of spans.
+ TraceID [16]byte
+
+ // SpanID is an 8-byte identifier for a single span.
+ SpanID [8]byte
+)
+
+func (t TraceID) String() string {
+ return fmt.Sprintf("%02x", t[:])
+}
+
+func (s SpanID) String() string {
+ return fmt.Sprintf("%02x", s[:])
+}
+
+// Annotation represents a text annotation with a set of attributes and a timestamp.
+type Annotation struct {
+ Time time.Time
+ Message string
+ Attributes map[string]interface{}
+}
+
+// Attribute represents a key-value pair on a span, link or annotation.
+// Construct with one of: BoolAttribute, Int64Attribute, or StringAttribute.
+type Attribute struct {
+ key string
+ value interface{}
+}
+
+// BoolAttribute returns a bool-valued attribute.
+func BoolAttribute(key string, value bool) Attribute {
+ return Attribute{key: key, value: value}
+}
+
+// Int64Attribute returns an int64-valued attribute.
+func Int64Attribute(key string, value int64) Attribute {
+ return Attribute{key: key, value: value}
+}
+
+// StringAttribute returns a string-valued attribute.
+func StringAttribute(key string, value string) Attribute {
+ return Attribute{key: key, value: value}
+}
+
+// LinkType specifies the relationship between the span that had the link
+// added, and the linked span.
+type LinkType int32
+
+// LinkType values.
+const (
+ LinkTypeUnspecified LinkType = iota // The relationship of the two spans is unknown.
+ LinkTypeChild // The current span is a child of the linked span.
+ LinkTypeParent // The current span is the parent of the linked span.
+)
+
+// Link represents a reference from one span to another span.
+type Link struct {
+ TraceID TraceID
+ SpanID SpanID
+ Type LinkType
+ // Attributes is a set of attributes on the link.
+ Attributes map[string]interface{}
+}
+
+// MessageEventType specifies the type of message event.
+type MessageEventType int32
+
+// MessageEventType values.
+const (
+ MessageEventTypeUnspecified MessageEventType = iota // Unknown event type.
+ MessageEventTypeSent // Indicates a sent RPC message.
+ MessageEventTypeRecv // Indicates a received RPC message.
+)
+
+// MessageEvent represents an event describing a message sent or received on the network.
+type MessageEvent struct {
+ Time time.Time
+ EventType MessageEventType
+ MessageID int64
+ UncompressedByteSize int64
+ CompressedByteSize int64
+}
+
+// Status is the status of a Span.
+type Status struct {
+ // Code is a status code. Zero indicates success.
+ //
+ // If Code will be propagated to Google APIs, it ideally should be a value from
+ // https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto .
+ Code int32
+ Message string
+}
diff --git a/vendor/go.opencensus.io/trace/config.go b/vendor/go.opencensus.io/trace/config.go
new file mode 100644
index 0000000..0816892
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/config.go
@@ -0,0 +1,48 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "sync"
+
+ "go.opencensus.io/trace/internal"
+)
+
+// Config represents the global tracing configuration.
+type Config struct {
+ // DefaultSampler is the default sampler used when creating new spans.
+ DefaultSampler Sampler
+
+ // IDGenerator is for internal use only.
+ IDGenerator internal.IDGenerator
+}
+
+var configWriteMu sync.Mutex
+
+// ApplyConfig applies changes to the global tracing configuration.
+//
+// Fields not provided in the given config are going to be preserved.
+func ApplyConfig(cfg Config) {
+ configWriteMu.Lock()
+ defer configWriteMu.Unlock()
+ c := *config.Load().(*Config)
+ if cfg.DefaultSampler != nil {
+ c.DefaultSampler = cfg.DefaultSampler
+ }
+ if cfg.IDGenerator != nil {
+ c.IDGenerator = cfg.IDGenerator
+ }
+ config.Store(&c)
+}
diff --git a/vendor/go.opencensus.io/trace/doc.go b/vendor/go.opencensus.io/trace/doc.go
new file mode 100644
index 0000000..04b1ee4
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/doc.go
@@ -0,0 +1,53 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*
+Package trace contains support for OpenCensus distributed tracing.
+
+The following assumes a basic familiarity with OpenCensus concepts.
+See http://opencensus.io
+
+
+Exporting Traces
+
+To export collected tracing data, register at least one exporter. You can use
+one of the provided exporters or write your own.
+
+ trace.RegisterExporter(exporter)
+
+By default, traces will be sampled relatively rarely. To change the sampling
+frequency for your entire program, call ApplyConfig. Use a ProbabilitySampler
+to sample a subset of traces, or use AlwaysSample to collect a trace on every run:
+
+ trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
+
+Be careful about using trace.AlwaysSample in a production application with
+significant traffic: a new trace will be started and exported for every request.
+
+Adding Spans to a Trace
+
+A trace consists of a tree of spans. In Go, the current span is carried in a
+context.Context.
+
+It is common to want to capture all the activity of a function call in a span. For
+this to work, the function must take a context.Context as a parameter. Add these two
+lines to the top of the function:
+
+ ctx, span := trace.StartSpan(ctx, "example.com/Run")
+ defer span.End()
+
+StartSpan will create a new top-level span if the context
+doesn't contain another span, otherwise it will create a child span.
+*/
+package trace // import "go.opencensus.io/trace"
diff --git a/vendor/go.opencensus.io/trace/exemplar.go b/vendor/go.opencensus.io/trace/exemplar.go
new file mode 100644
index 0000000..416d805
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/exemplar.go
@@ -0,0 +1,43 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "context"
+ "encoding/hex"
+
+ "go.opencensus.io/exemplar"
+)
+
+func init() {
+ exemplar.RegisterAttachmentExtractor(attachSpanContext)
+}
+
+func attachSpanContext(ctx context.Context, a exemplar.Attachments) exemplar.Attachments {
+ span := FromContext(ctx)
+ if span == nil {
+ return a
+ }
+ sc := span.SpanContext()
+ if !sc.IsSampled() {
+ return a
+ }
+ if a == nil {
+ a = make(exemplar.Attachments)
+ }
+ a[exemplar.KeyTraceID] = hex.EncodeToString(sc.TraceID[:])
+ a[exemplar.KeySpanID] = hex.EncodeToString(sc.SpanID[:])
+ return a
+}
diff --git a/vendor/go.opencensus.io/trace/export.go b/vendor/go.opencensus.io/trace/export.go
new file mode 100644
index 0000000..77a8c73
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/export.go
@@ -0,0 +1,90 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "sync"
+ "sync/atomic"
+ "time"
+)
+
+// Exporter is a type for functions that receive sampled trace spans.
+//
+// The ExportSpan method should be safe for concurrent use and should return
+// quickly; if an Exporter takes a significant amount of time to process a
+// SpanData, that work should be done on another goroutine.
+//
+// The SpanData should not be modified, but a pointer to it can be kept.
+type Exporter interface {
+ ExportSpan(s *SpanData)
+}
+
+type exportersMap map[Exporter]struct{}
+
+var (
+ exporterMu sync.Mutex
+ exporters atomic.Value
+)
+
+// RegisterExporter adds to the list of Exporters that will receive sampled
+// trace spans.
+//
+// Binaries can register exporters, libraries shouldn't register exporters.
+func RegisterExporter(e Exporter) {
+ exporterMu.Lock()
+ new := make(exportersMap)
+ if old, ok := exporters.Load().(exportersMap); ok {
+ for k, v := range old {
+ new[k] = v
+ }
+ }
+ new[e] = struct{}{}
+ exporters.Store(new)
+ exporterMu.Unlock()
+}
+
+// UnregisterExporter removes from the list of Exporters the Exporter that was
+// registered with the given name.
+func UnregisterExporter(e Exporter) {
+ exporterMu.Lock()
+ new := make(exportersMap)
+ if old, ok := exporters.Load().(exportersMap); ok {
+ for k, v := range old {
+ new[k] = v
+ }
+ }
+ delete(new, e)
+ exporters.Store(new)
+ exporterMu.Unlock()
+}
+
+// SpanData contains all the information collected by a Span.
+type SpanData struct {
+ SpanContext
+ ParentSpanID SpanID
+ SpanKind int
+ Name string
+ StartTime time.Time
+ // The wall clock time of EndTime will be adjusted to always be offset
+ // from StartTime by the duration of the span.
+ EndTime time.Time
+ // The values of Attributes each have type string, bool, or int64.
+ Attributes map[string]interface{}
+ Annotations []Annotation
+ MessageEvents []MessageEvent
+ Status
+ Links []Link
+ HasRemoteParent bool
+}
diff --git a/vendor/go.opencensus.io/trace/internal/internal.go b/vendor/go.opencensus.io/trace/internal/internal.go
new file mode 100644
index 0000000..1c8b9b3
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/internal/internal.go
@@ -0,0 +1,21 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package internal provides trace internals.
+package internal
+
+type IDGenerator interface {
+ NewTraceID() [16]byte
+ NewSpanID() [8]byte
+}
diff --git a/vendor/go.opencensus.io/trace/propagation/propagation.go b/vendor/go.opencensus.io/trace/propagation/propagation.go
new file mode 100644
index 0000000..1eb190a
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/propagation/propagation.go
@@ -0,0 +1,108 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package propagation implements the binary trace context format.
+package propagation // import "go.opencensus.io/trace/propagation"
+
+// TODO: link to external spec document.
+
+// BinaryFormat format:
+//
+// Binary value: <version_id><version_format>
+// version_id: 1 byte representing the version id.
+//
+// For version_id = 0:
+//
+// version_format: <field><field>
+// field_format: <field_id><field_format>
+//
+// Fields:
+//
+// TraceId: (field_id = 0, len = 16, default = "0000000000000000") - 16-byte array representing the trace_id.
+// SpanId: (field_id = 1, len = 8, default = "00000000") - 8-byte array representing the span_id.
+// TraceOptions: (field_id = 2, len = 1, default = "0") - 1-byte array representing the trace_options.
+//
+// Fields MUST be encoded using the field id order (smaller to higher).
+//
+// Valid value example:
+//
+// {0, 0, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 1, 97,
+// 98, 99, 100, 101, 102, 103, 104, 2, 1}
+//
+// version_id = 0;
+// trace_id = {64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79}
+// span_id = {97, 98, 99, 100, 101, 102, 103, 104};
+// trace_options = {1};
+
+import (
+ "net/http"
+
+ "go.opencensus.io/trace"
+)
+
+// Binary returns the binary format representation of a SpanContext.
+//
+// If sc is the zero value, Binary returns nil.
+func Binary(sc trace.SpanContext) []byte {
+ if sc == (trace.SpanContext{}) {
+ return nil
+ }
+ var b [29]byte
+ copy(b[2:18], sc.TraceID[:])
+ b[18] = 1
+ copy(b[19:27], sc.SpanID[:])
+ b[27] = 2
+ b[28] = uint8(sc.TraceOptions)
+ return b[:]
+}
+
+// FromBinary returns the SpanContext represented by b.
+//
+// If b has an unsupported version ID or contains no TraceID, FromBinary
+// returns with ok==false.
+func FromBinary(b []byte) (sc trace.SpanContext, ok bool) {
+ if len(b) == 0 || b[0] != 0 {
+ return trace.SpanContext{}, false
+ }
+ b = b[1:]
+ if len(b) >= 17 && b[0] == 0 {
+ copy(sc.TraceID[:], b[1:17])
+ b = b[17:]
+ } else {
+ return trace.SpanContext{}, false
+ }
+ if len(b) >= 9 && b[0] == 1 {
+ copy(sc.SpanID[:], b[1:9])
+ b = b[9:]
+ }
+ if len(b) >= 2 && b[0] == 2 {
+ sc.TraceOptions = trace.TraceOptions(b[1])
+ }
+ return sc, true
+}
+
+// HTTPFormat implementations propagate span contexts
+// in HTTP requests.
+//
+// SpanContextFromRequest extracts a span context from incoming
+// requests.
+//
+// SpanContextToRequest modifies the given request to include the given
+// span context.
+type HTTPFormat interface {
+ SpanContextFromRequest(req *http.Request) (sc trace.SpanContext, ok bool)
+ SpanContextToRequest(sc trace.SpanContext, req *http.Request)
+}
+
+// TODO(jbd): Find a more representative but short name for HTTPFormat.
diff --git a/vendor/go.opencensus.io/trace/sampling.go b/vendor/go.opencensus.io/trace/sampling.go
new file mode 100644
index 0000000..71c10f9
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/sampling.go
@@ -0,0 +1,75 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "encoding/binary"
+)
+
+const defaultSamplingProbability = 1e-4
+
+// Sampler decides whether a trace should be sampled and exported.
+type Sampler func(SamplingParameters) SamplingDecision
+
+// SamplingParameters contains the values passed to a Sampler.
+type SamplingParameters struct {
+ ParentContext SpanContext
+ TraceID TraceID
+ SpanID SpanID
+ Name string
+ HasRemoteParent bool
+}
+
+// SamplingDecision is the value returned by a Sampler.
+type SamplingDecision struct {
+ Sample bool
+}
+
+// ProbabilitySampler returns a Sampler that samples a given fraction of traces.
+//
+// It also samples spans whose parents are sampled.
+func ProbabilitySampler(fraction float64) Sampler {
+ if !(fraction >= 0) {
+ fraction = 0
+ } else if fraction >= 1 {
+ return AlwaysSample()
+ }
+
+ traceIDUpperBound := uint64(fraction * (1 << 63))
+ return Sampler(func(p SamplingParameters) SamplingDecision {
+ if p.ParentContext.IsSampled() {
+ return SamplingDecision{Sample: true}
+ }
+ x := binary.BigEndian.Uint64(p.TraceID[0:8]) >> 1
+ return SamplingDecision{Sample: x < traceIDUpperBound}
+ })
+}
+
+// AlwaysSample returns a Sampler that samples every trace.
+// Be careful about using this sampler in a production application with
+// significant traffic: a new trace will be started and exported for every
+// request.
+func AlwaysSample() Sampler {
+ return func(p SamplingParameters) SamplingDecision {
+ return SamplingDecision{Sample: true}
+ }
+}
+
+// NeverSample returns a Sampler that samples no traces.
+func NeverSample() Sampler {
+ return func(p SamplingParameters) SamplingDecision {
+ return SamplingDecision{Sample: false}
+ }
+}
diff --git a/vendor/go.opencensus.io/trace/spanbucket.go b/vendor/go.opencensus.io/trace/spanbucket.go
new file mode 100644
index 0000000..fbabad3
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/spanbucket.go
@@ -0,0 +1,130 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "time"
+)
+
+// samplePeriod is the minimum time between accepting spans in a single bucket.
+const samplePeriod = time.Second
+
+// defaultLatencies contains the default latency bucket bounds.
+// TODO: consider defaults, make configurable
+var defaultLatencies = [...]time.Duration{
+ 10 * time.Microsecond,
+ 100 * time.Microsecond,
+ time.Millisecond,
+ 10 * time.Millisecond,
+ 100 * time.Millisecond,
+ time.Second,
+ 10 * time.Second,
+ time.Minute,
+}
+
+// bucket is a container for a set of spans for a particular error code or latency range.
+type bucket struct {
+ nextTime time.Time // next time we can accept a span
+ buffer []*SpanData // circular buffer of spans
+ nextIndex int // location next SpanData should be placed in buffer
+ overflow bool // whether the circular buffer has wrapped around
+}
+
+func makeBucket(bufferSize int) bucket {
+ return bucket{
+ buffer: make([]*SpanData, bufferSize),
+ }
+}
+
+// add adds a span to the bucket, if nextTime has been reached.
+func (b *bucket) add(s *SpanData) {
+ if s.EndTime.Before(b.nextTime) {
+ return
+ }
+ if len(b.buffer) == 0 {
+ return
+ }
+ b.nextTime = s.EndTime.Add(samplePeriod)
+ b.buffer[b.nextIndex] = s
+ b.nextIndex++
+ if b.nextIndex == len(b.buffer) {
+ b.nextIndex = 0
+ b.overflow = true
+ }
+}
+
+// size returns the number of spans in the bucket.
+func (b *bucket) size() int {
+ if b.overflow {
+ return len(b.buffer)
+ }
+ return b.nextIndex
+}
+
+// span returns the ith span in the bucket.
+func (b *bucket) span(i int) *SpanData {
+ if !b.overflow {
+ return b.buffer[i]
+ }
+ if i < len(b.buffer)-b.nextIndex {
+ return b.buffer[b.nextIndex+i]
+ }
+ return b.buffer[b.nextIndex+i-len(b.buffer)]
+}
+
+// resize changes the size of the bucket to n, keeping up to n existing spans.
+func (b *bucket) resize(n int) {
+ cur := b.size()
+ newBuffer := make([]*SpanData, n)
+ if cur < n {
+ for i := 0; i < cur; i++ {
+ newBuffer[i] = b.span(i)
+ }
+ b.buffer = newBuffer
+ b.nextIndex = cur
+ b.overflow = false
+ return
+ }
+ for i := 0; i < n; i++ {
+ newBuffer[i] = b.span(i + cur - n)
+ }
+ b.buffer = newBuffer
+ b.nextIndex = 0
+ b.overflow = true
+}
+
+// latencyBucket returns the appropriate bucket number for a given latency.
+func latencyBucket(latency time.Duration) int {
+ i := 0
+ for i < len(defaultLatencies) && latency >= defaultLatencies[i] {
+ i++
+ }
+ return i
+}
+
+// latencyBucketBounds returns the lower and upper bounds for a latency bucket
+// number.
+//
+// The lower bound is inclusive, the upper bound is exclusive (except for the
+// last bucket.)
+func latencyBucketBounds(index int) (lower time.Duration, upper time.Duration) {
+ if index == 0 {
+ return 0, defaultLatencies[index]
+ }
+ if index == len(defaultLatencies) {
+ return defaultLatencies[index-1], 1<<63 - 1
+ }
+ return defaultLatencies[index-1], defaultLatencies[index]
+}
diff --git a/vendor/go.opencensus.io/trace/spanstore.go b/vendor/go.opencensus.io/trace/spanstore.go
new file mode 100644
index 0000000..c442d99
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/spanstore.go
@@ -0,0 +1,306 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "sync"
+ "time"
+
+ "go.opencensus.io/internal"
+)
+
+const (
+ maxBucketSize = 100000
+ defaultBucketSize = 10
+)
+
+var (
+ ssmu sync.RWMutex // protects spanStores
+ spanStores = make(map[string]*spanStore)
+)
+
+// This exists purely to avoid exposing internal methods used by z-Pages externally.
+type internalOnly struct{}
+
+func init() {
+ //TODO(#412): remove
+ internal.Trace = &internalOnly{}
+}
+
+// ReportActiveSpans returns the active spans for the given name.
+func (i internalOnly) ReportActiveSpans(name string) []*SpanData {
+ s := spanStoreForName(name)
+ if s == nil {
+ return nil
+ }
+ var out []*SpanData
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ for span := range s.active {
+ out = append(out, span.makeSpanData())
+ }
+ return out
+}
+
+// ReportSpansByError returns a sample of error spans.
+//
+// If code is nonzero, only spans with that status code are returned.
+func (i internalOnly) ReportSpansByError(name string, code int32) []*SpanData {
+ s := spanStoreForName(name)
+ if s == nil {
+ return nil
+ }
+ var out []*SpanData
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if code != 0 {
+ if b, ok := s.errors[code]; ok {
+ for _, sd := range b.buffer {
+ if sd == nil {
+ break
+ }
+ out = append(out, sd)
+ }
+ }
+ } else {
+ for _, b := range s.errors {
+ for _, sd := range b.buffer {
+ if sd == nil {
+ break
+ }
+ out = append(out, sd)
+ }
+ }
+ }
+ return out
+}
+
+// ConfigureBucketSizes sets the number of spans to keep per latency and error
+// bucket for different span names.
+func (i internalOnly) ConfigureBucketSizes(bcs []internal.BucketConfiguration) {
+ for _, bc := range bcs {
+ latencyBucketSize := bc.MaxRequestsSucceeded
+ if latencyBucketSize < 0 {
+ latencyBucketSize = 0
+ }
+ if latencyBucketSize > maxBucketSize {
+ latencyBucketSize = maxBucketSize
+ }
+ errorBucketSize := bc.MaxRequestsErrors
+ if errorBucketSize < 0 {
+ errorBucketSize = 0
+ }
+ if errorBucketSize > maxBucketSize {
+ errorBucketSize = maxBucketSize
+ }
+ spanStoreSetSize(bc.Name, latencyBucketSize, errorBucketSize)
+ }
+}
+
+// ReportSpansPerMethod returns a summary of what spans are being stored for each span name.
+func (i internalOnly) ReportSpansPerMethod() map[string]internal.PerMethodSummary {
+ out := make(map[string]internal.PerMethodSummary)
+ ssmu.RLock()
+ defer ssmu.RUnlock()
+ for name, s := range spanStores {
+ s.mu.Lock()
+ p := internal.PerMethodSummary{
+ Active: len(s.active),
+ }
+ for code, b := range s.errors {
+ p.ErrorBuckets = append(p.ErrorBuckets, internal.ErrorBucketSummary{
+ ErrorCode: code,
+ Size: b.size(),
+ })
+ }
+ for i, b := range s.latency {
+ min, max := latencyBucketBounds(i)
+ p.LatencyBuckets = append(p.LatencyBuckets, internal.LatencyBucketSummary{
+ MinLatency: min,
+ MaxLatency: max,
+ Size: b.size(),
+ })
+ }
+ s.mu.Unlock()
+ out[name] = p
+ }
+ return out
+}
+
+// ReportSpansByLatency returns a sample of successful spans.
+//
+// minLatency is the minimum latency of spans to be returned.
+// maxLatency, if nonzero, is the maximum latency of spans to be returned.
+func (i internalOnly) ReportSpansByLatency(name string, minLatency, maxLatency time.Duration) []*SpanData {
+ s := spanStoreForName(name)
+ if s == nil {
+ return nil
+ }
+ var out []*SpanData
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ for i, b := range s.latency {
+ min, max := latencyBucketBounds(i)
+ if i+1 != len(s.latency) && max <= minLatency {
+ continue
+ }
+ if maxLatency != 0 && maxLatency < min {
+ continue
+ }
+ for _, sd := range b.buffer {
+ if sd == nil {
+ break
+ }
+ if minLatency != 0 || maxLatency != 0 {
+ d := sd.EndTime.Sub(sd.StartTime)
+ if d < minLatency {
+ continue
+ }
+ if maxLatency != 0 && d > maxLatency {
+ continue
+ }
+ }
+ out = append(out, sd)
+ }
+ }
+ return out
+}
+
+// spanStore keeps track of spans stored for a particular span name.
+//
+// It contains all active spans; a sample of spans for failed requests,
+// categorized by error code; and a sample of spans for successful requests,
+// bucketed by latency.
+type spanStore struct {
+ mu sync.Mutex // protects everything below.
+ active map[*Span]struct{}
+ errors map[int32]*bucket
+ latency []bucket
+ maxSpansPerErrorBucket int
+}
+
+// newSpanStore creates a span store.
+func newSpanStore(name string, latencyBucketSize int, errorBucketSize int) *spanStore {
+ s := &spanStore{
+ active: make(map[*Span]struct{}),
+ latency: make([]bucket, len(defaultLatencies)+1),
+ maxSpansPerErrorBucket: errorBucketSize,
+ }
+ for i := range s.latency {
+ s.latency[i] = makeBucket(latencyBucketSize)
+ }
+ return s
+}
+
+// spanStoreForName returns the spanStore for the given name.
+//
+// It returns nil if it doesn't exist.
+func spanStoreForName(name string) *spanStore {
+ var s *spanStore
+ ssmu.RLock()
+ s, _ = spanStores[name]
+ ssmu.RUnlock()
+ return s
+}
+
+// spanStoreForNameCreateIfNew returns the spanStore for the given name.
+//
+// It creates it if it didn't exist.
+func spanStoreForNameCreateIfNew(name string) *spanStore {
+ ssmu.RLock()
+ s, ok := spanStores[name]
+ ssmu.RUnlock()
+ if ok {
+ return s
+ }
+ ssmu.Lock()
+ defer ssmu.Unlock()
+ s, ok = spanStores[name]
+ if ok {
+ return s
+ }
+ s = newSpanStore(name, defaultBucketSize, defaultBucketSize)
+ spanStores[name] = s
+ return s
+}
+
+// spanStoreSetSize resizes the spanStore for the given name.
+//
+// It creates it if it didn't exist.
+func spanStoreSetSize(name string, latencyBucketSize int, errorBucketSize int) {
+ ssmu.RLock()
+ s, ok := spanStores[name]
+ ssmu.RUnlock()
+ if ok {
+ s.resize(latencyBucketSize, errorBucketSize)
+ return
+ }
+ ssmu.Lock()
+ defer ssmu.Unlock()
+ s, ok = spanStores[name]
+ if ok {
+ s.resize(latencyBucketSize, errorBucketSize)
+ return
+ }
+ s = newSpanStore(name, latencyBucketSize, errorBucketSize)
+ spanStores[name] = s
+}
+
+func (s *spanStore) resize(latencyBucketSize int, errorBucketSize int) {
+ s.mu.Lock()
+ for i := range s.latency {
+ s.latency[i].resize(latencyBucketSize)
+ }
+ for _, b := range s.errors {
+ b.resize(errorBucketSize)
+ }
+ s.maxSpansPerErrorBucket = errorBucketSize
+ s.mu.Unlock()
+}
+
+// add adds a span to the active bucket of the spanStore.
+func (s *spanStore) add(span *Span) {
+ s.mu.Lock()
+ s.active[span] = struct{}{}
+ s.mu.Unlock()
+}
+
+// finished removes a span from the active set, and adds a corresponding
+// SpanData to a latency or error bucket.
+func (s *spanStore) finished(span *Span, sd *SpanData) {
+ latency := sd.EndTime.Sub(sd.StartTime)
+ if latency < 0 {
+ latency = 0
+ }
+ code := sd.Status.Code
+
+ s.mu.Lock()
+ delete(s.active, span)
+ if code == 0 {
+ s.latency[latencyBucket(latency)].add(sd)
+ } else {
+ if s.errors == nil {
+ s.errors = make(map[int32]*bucket)
+ }
+ if b := s.errors[code]; b != nil {
+ b.add(sd)
+ } else {
+ b := makeBucket(s.maxSpansPerErrorBucket)
+ s.errors[code] = &b
+ b.add(sd)
+ }
+ }
+ s.mu.Unlock()
+}
diff --git a/vendor/go.opencensus.io/trace/status_codes.go b/vendor/go.opencensus.io/trace/status_codes.go
new file mode 100644
index 0000000..ec60eff
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/status_codes.go
@@ -0,0 +1,37 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+// Status codes for use with Span.SetStatus. These correspond to the status
+// codes used by gRPC defined here: https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto
+const (
+ StatusCodeOK = 0
+ StatusCodeCancelled = 1
+ StatusCodeUnknown = 2
+ StatusCodeInvalidArgument = 3
+ StatusCodeDeadlineExceeded = 4
+ StatusCodeNotFound = 5
+ StatusCodeAlreadyExists = 6
+ StatusCodePermissionDenied = 7
+ StatusCodeResourceExhausted = 8
+ StatusCodeFailedPrecondition = 9
+ StatusCodeAborted = 10
+ StatusCodeOutOfRange = 11
+ StatusCodeUnimplemented = 12
+ StatusCodeInternal = 13
+ StatusCodeUnavailable = 14
+ StatusCodeDataLoss = 15
+ StatusCodeUnauthenticated = 16
+)
diff --git a/vendor/go.opencensus.io/trace/trace.go b/vendor/go.opencensus.io/trace/trace.go
new file mode 100644
index 0000000..9e5e5f0
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/trace.go
@@ -0,0 +1,516 @@
+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+ "context"
+ crand "crypto/rand"
+ "encoding/binary"
+ "fmt"
+ "math/rand"
+ "sync"
+ "sync/atomic"
+ "time"
+
+ "go.opencensus.io/internal"
+ "go.opencensus.io/trace/tracestate"
+)
+
+// Span represents a span of a trace. It has an associated SpanContext, and
+// stores data accumulated while the span is active.
+//
+// Ideally users should interact with Spans by calling the functions in this
+// package that take a Context parameter.
+type Span struct {
+ // data contains information recorded about the span.
+ //
+ // It will be non-nil if we are exporting the span or recording events for it.
+ // Otherwise, data is nil, and the Span is simply a carrier for the
+ // SpanContext, so that the trace ID is propagated.
+ data *SpanData
+ mu sync.Mutex // protects the contents of *data (but not the pointer value.)
+ spanContext SpanContext
+ // spanStore is the spanStore this span belongs to, if any, otherwise it is nil.
+ *spanStore
+ endOnce sync.Once
+
+ executionTracerTaskEnd func() // ends the execution tracer span
+}
+
+// IsRecordingEvents returns true if events are being recorded for this span.
+// Use this check to avoid computing expensive annotations when they will never
+// be used.
+func (s *Span) IsRecordingEvents() bool {
+ if s == nil {
+ return false
+ }
+ return s.data != nil
+}
+
+// TraceOptions contains options associated with a trace span.
+type TraceOptions uint32
+
+// IsSampled returns true if the span will be exported.
+func (sc SpanContext) IsSampled() bool {
+ return sc.TraceOptions.IsSampled()
+}
+
+// setIsSampled sets the TraceOptions bit that determines whether the span will be exported.
+func (sc *SpanContext) setIsSampled(sampled bool) {
+ if sampled {
+ sc.TraceOptions |= 1
+ } else {
+ sc.TraceOptions &= ^TraceOptions(1)
+ }
+}
+
+// IsSampled returns true if the span will be exported.
+func (t TraceOptions) IsSampled() bool {
+ return t&1 == 1
+}
+
+// SpanContext contains the state that must propagate across process boundaries.
+//
+// SpanContext is not an implementation of context.Context.
+// TODO: add reference to external Census docs for SpanContext.
+type SpanContext struct {
+ TraceID TraceID
+ SpanID SpanID
+ TraceOptions TraceOptions
+ Tracestate *tracestate.Tracestate
+}
+
+type contextKey struct{}
+
+// FromContext returns the Span stored in a context, or nil if there isn't one.
+func FromContext(ctx context.Context) *Span {
+ s, _ := ctx.Value(contextKey{}).(*Span)
+ return s
+}
+
+// NewContext returns a new context with the given Span attached.
+func NewContext(parent context.Context, s *Span) context.Context {
+ return context.WithValue(parent, contextKey{}, s)
+}
+
+// All available span kinds. Span kind must be either one of these values.
+const (
+ SpanKindUnspecified = iota
+ SpanKindServer
+ SpanKindClient
+)
+
+// StartOptions contains options concerning how a span is started.
+type StartOptions struct {
+ // Sampler to consult for this Span. If provided, it is always consulted.
+ //
+ // If not provided, then the behavior differs based on whether
+ // the parent of this Span is remote, local, or there is no parent.
+ // In the case of a remote parent or no parent, the
+ // default sampler (see Config) will be consulted. Otherwise,
+ // when there is a non-remote parent, no new sampling decision will be made:
+ // we will preserve the sampling of the parent.
+ Sampler Sampler
+
+ // SpanKind represents the kind of a span. If none is set,
+ // SpanKindUnspecified is used.
+ SpanKind int
+}
+
+// StartOption apply changes to StartOptions.
+type StartOption func(*StartOptions)
+
+// WithSpanKind makes new spans to be created with the given kind.
+func WithSpanKind(spanKind int) StartOption {
+ return func(o *StartOptions) {
+ o.SpanKind = spanKind
+ }
+}
+
+// WithSampler makes new spans to be be created with a custom sampler.
+// Otherwise, the global sampler is used.
+func WithSampler(sampler Sampler) StartOption {
+ return func(o *StartOptions) {
+ o.Sampler = sampler
+ }
+}
+
+// StartSpan starts a new child span of the current span in the context. If
+// there is no span in the context, creates a new trace and span.
+//
+// Returned context contains the newly created span. You can use it to
+// propagate the returned span in process.
+func StartSpan(ctx context.Context, name string, o ...StartOption) (context.Context, *Span) {
+ var opts StartOptions
+ var parent SpanContext
+ if p := FromContext(ctx); p != nil {
+ parent = p.spanContext
+ }
+ for _, op := range o {
+ op(&opts)
+ }
+ span := startSpanInternal(name, parent != SpanContext{}, parent, false, opts)
+
+ ctx, end := startExecutionTracerTask(ctx, name)
+ span.executionTracerTaskEnd = end
+ return NewContext(ctx, span), span
+}
+
+// StartSpanWithRemoteParent starts a new child span of the span from the given parent.
+//
+// If the incoming context contains a parent, it ignores. StartSpanWithRemoteParent is
+// preferred for cases where the parent is propagated via an incoming request.
+//
+// Returned context contains the newly created span. You can use it to
+// propagate the returned span in process.
+func StartSpanWithRemoteParent(ctx context.Context, name string, parent SpanContext, o ...StartOption) (context.Context, *Span) {
+ var opts StartOptions
+ for _, op := range o {
+ op(&opts)
+ }
+ span := startSpanInternal(name, parent != SpanContext{}, parent, true, opts)
+ ctx, end := startExecutionTracerTask(ctx, name)
+ span.executionTracerTaskEnd = end
+ return NewContext(ctx, span), span
+}
+
+func startSpanInternal(name string, hasParent bool, parent SpanContext, remoteParent bool, o StartOptions) *Span {
+ span := &Span{}
+ span.spanContext = parent
+
+ cfg := config.Load().(*Config)
+
+ if !hasParent {
+ span.spanContext.TraceID = cfg.IDGenerator.NewTraceID()
+ }
+ span.spanContext.SpanID = cfg.IDGenerator.NewSpanID()
+ sampler := cfg.DefaultSampler
+
+ if !hasParent || remoteParent || o.Sampler != nil {
+ // If this span is the child of a local span and no Sampler is set in the
+ // options, keep the parent's TraceOptions.
+ //
+ // Otherwise, consult the Sampler in the options if it is non-nil, otherwise
+ // the default sampler.
+ if o.Sampler != nil {
+ sampler = o.Sampler
+ }
+ span.spanContext.setIsSampled(sampler(SamplingParameters{
+ ParentContext: parent,
+ TraceID: span.spanContext.TraceID,
+ SpanID: span.spanContext.SpanID,
+ Name: name,
+ HasRemoteParent: remoteParent}).Sample)
+ }
+
+ if !internal.LocalSpanStoreEnabled && !span.spanContext.IsSampled() {
+ return span
+ }
+
+ span.data = &SpanData{
+ SpanContext: span.spanContext,
+ StartTime: time.Now(),
+ SpanKind: o.SpanKind,
+ Name: name,
+ HasRemoteParent: remoteParent,
+ }
+ if hasParent {
+ span.data.ParentSpanID = parent.SpanID
+ }
+ if internal.LocalSpanStoreEnabled {
+ var ss *spanStore
+ ss = spanStoreForNameCreateIfNew(name)
+ if ss != nil {
+ span.spanStore = ss
+ ss.add(span)
+ }
+ }
+
+ return span
+}
+
+// End ends the span.
+func (s *Span) End() {
+ if s == nil {
+ return
+ }
+ if s.executionTracerTaskEnd != nil {
+ s.executionTracerTaskEnd()
+ }
+ if !s.IsRecordingEvents() {
+ return
+ }
+ s.endOnce.Do(func() {
+ exp, _ := exporters.Load().(exportersMap)
+ mustExport := s.spanContext.IsSampled() && len(exp) > 0
+ if s.spanStore != nil || mustExport {
+ sd := s.makeSpanData()
+ sd.EndTime = internal.MonotonicEndTime(sd.StartTime)
+ if s.spanStore != nil {
+ s.spanStore.finished(s, sd)
+ }
+ if mustExport {
+ for e := range exp {
+ e.ExportSpan(sd)
+ }
+ }
+ }
+ })
+}
+
+// makeSpanData produces a SpanData representing the current state of the Span.
+// It requires that s.data is non-nil.
+func (s *Span) makeSpanData() *SpanData {
+ var sd SpanData
+ s.mu.Lock()
+ sd = *s.data
+ if s.data.Attributes != nil {
+ sd.Attributes = make(map[string]interface{})
+ for k, v := range s.data.Attributes {
+ sd.Attributes[k] = v
+ }
+ }
+ s.mu.Unlock()
+ return &sd
+}
+
+// SpanContext returns the SpanContext of the span.
+func (s *Span) SpanContext() SpanContext {
+ if s == nil {
+ return SpanContext{}
+ }
+ return s.spanContext
+}
+
+// SetName sets the name of the span, if it is recording events.
+func (s *Span) SetName(name string) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ s.mu.Lock()
+ s.data.Name = name
+ s.mu.Unlock()
+}
+
+// SetStatus sets the status of the span, if it is recording events.
+func (s *Span) SetStatus(status Status) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ s.mu.Lock()
+ s.data.Status = status
+ s.mu.Unlock()
+}
+
+// AddAttributes sets attributes in the span.
+//
+// Existing attributes whose keys appear in the attributes parameter are overwritten.
+func (s *Span) AddAttributes(attributes ...Attribute) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ s.mu.Lock()
+ if s.data.Attributes == nil {
+ s.data.Attributes = make(map[string]interface{})
+ }
+ copyAttributes(s.data.Attributes, attributes)
+ s.mu.Unlock()
+}
+
+// copyAttributes copies a slice of Attributes into a map.
+func copyAttributes(m map[string]interface{}, attributes []Attribute) {
+ for _, a := range attributes {
+ m[a.key] = a.value
+ }
+}
+
+func (s *Span) lazyPrintfInternal(attributes []Attribute, format string, a ...interface{}) {
+ now := time.Now()
+ msg := fmt.Sprintf(format, a...)
+ var m map[string]interface{}
+ s.mu.Lock()
+ if len(attributes) != 0 {
+ m = make(map[string]interface{})
+ copyAttributes(m, attributes)
+ }
+ s.data.Annotations = append(s.data.Annotations, Annotation{
+ Time: now,
+ Message: msg,
+ Attributes: m,
+ })
+ s.mu.Unlock()
+}
+
+func (s *Span) printStringInternal(attributes []Attribute, str string) {
+ now := time.Now()
+ var a map[string]interface{}
+ s.mu.Lock()
+ if len(attributes) != 0 {
+ a = make(map[string]interface{})
+ copyAttributes(a, attributes)
+ }
+ s.data.Annotations = append(s.data.Annotations, Annotation{
+ Time: now,
+ Message: str,
+ Attributes: a,
+ })
+ s.mu.Unlock()
+}
+
+// Annotate adds an annotation with attributes.
+// Attributes can be nil.
+func (s *Span) Annotate(attributes []Attribute, str string) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ s.printStringInternal(attributes, str)
+}
+
+// Annotatef adds an annotation with attributes.
+func (s *Span) Annotatef(attributes []Attribute, format string, a ...interface{}) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ s.lazyPrintfInternal(attributes, format, a...)
+}
+
+// AddMessageSendEvent adds a message send event to the span.
+//
+// messageID is an identifier for the message, which is recommended to be
+// unique in this span and the same between the send event and the receive
+// event (this allows to identify a message between the sender and receiver).
+// For example, this could be a sequence id.
+func (s *Span) AddMessageSendEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ now := time.Now()
+ s.mu.Lock()
+ s.data.MessageEvents = append(s.data.MessageEvents, MessageEvent{
+ Time: now,
+ EventType: MessageEventTypeSent,
+ MessageID: messageID,
+ UncompressedByteSize: uncompressedByteSize,
+ CompressedByteSize: compressedByteSize,
+ })
+ s.mu.Unlock()
+}
+
+// AddMessageReceiveEvent adds a message receive event to the span.
+//
+// messageID is an identifier for the message, which is recommended to be
+// unique in this span and the same between the send event and the receive
+// event (this allows to identify a message between the sender and receiver).
+// For example, this could be a sequence id.
+func (s *Span) AddMessageReceiveEvent(messageID, uncompressedByteSize, compressedByteSize int64) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ now := time.Now()
+ s.mu.Lock()
+ s.data.MessageEvents = append(s.data.MessageEvents, MessageEvent{
+ Time: now,
+ EventType: MessageEventTypeRecv,
+ MessageID: messageID,
+ UncompressedByteSize: uncompressedByteSize,
+ CompressedByteSize: compressedByteSize,
+ })
+ s.mu.Unlock()
+}
+
+// AddLink adds a link to the span.
+func (s *Span) AddLink(l Link) {
+ if !s.IsRecordingEvents() {
+ return
+ }
+ s.mu.Lock()
+ s.data.Links = append(s.data.Links, l)
+ s.mu.Unlock()
+}
+
+func (s *Span) String() string {
+ if s == nil {
+ return "<nil>"
+ }
+ if s.data == nil {
+ return fmt.Sprintf("span %s", s.spanContext.SpanID)
+ }
+ s.mu.Lock()
+ str := fmt.Sprintf("span %s %q", s.spanContext.SpanID, s.data.Name)
+ s.mu.Unlock()
+ return str
+}
+
+var config atomic.Value // access atomically
+
+func init() {
+ gen := &defaultIDGenerator{}
+ // initialize traceID and spanID generators.
+ var rngSeed int64
+ for _, p := range []interface{}{
+ &rngSeed, &gen.traceIDAdd, &gen.nextSpanID, &gen.spanIDInc,
+ } {
+ binary.Read(crand.Reader, binary.LittleEndian, p)
+ }
+ gen.traceIDRand = rand.New(rand.NewSource(rngSeed))
+ gen.spanIDInc |= 1
+
+ config.Store(&Config{
+ DefaultSampler: ProbabilitySampler(defaultSamplingProbability),
+ IDGenerator: gen,
+ })
+}
+
+type defaultIDGenerator struct {
+ sync.Mutex
+
+ // Please keep these as the first fields
+ // so that these 8 byte fields will be aligned on addresses
+ // divisible by 8, on both 32-bit and 64-bit machines when
+ // performing atomic increments and accesses.
+ // See:
+ // * https://github.com/census-instrumentation/opencensus-go/issues/587
+ // * https://github.com/census-instrumentation/opencensus-go/issues/865
+ // * https://golang.org/pkg/sync/atomic/#pkg-note-BUG
+ nextSpanID uint64
+ spanIDInc uint64
+
+ traceIDAdd [2]uint64
+ traceIDRand *rand.Rand
+}
+
+// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
+func (gen *defaultIDGenerator) NewSpanID() [8]byte {
+ var id uint64
+ for id == 0 {
+ id = atomic.AddUint64(&gen.nextSpanID, gen.spanIDInc)
+ }
+ var sid [8]byte
+ binary.LittleEndian.PutUint64(sid[:], id)
+ return sid
+}
+
+// NewTraceID returns a non-zero trace ID from a randomly-chosen sequence.
+// mu should be held while this function is called.
+func (gen *defaultIDGenerator) NewTraceID() [16]byte {
+ var tid [16]byte
+ // Construct the trace ID from two outputs of traceIDRand, with a constant
+ // added to each half for additional entropy.
+ gen.Lock()
+ binary.LittleEndian.PutUint64(tid[0:8], gen.traceIDRand.Uint64()+gen.traceIDAdd[0])
+ binary.LittleEndian.PutUint64(tid[8:16], gen.traceIDRand.Uint64()+gen.traceIDAdd[1])
+ gen.Unlock()
+ return tid
+}
diff --git a/vendor/go.opencensus.io/trace/trace_go11.go b/vendor/go.opencensus.io/trace/trace_go11.go
new file mode 100644
index 0000000..b7d8aaf
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/trace_go11.go
@@ -0,0 +1,32 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.11
+
+package trace
+
+import (
+ "context"
+ t "runtime/trace"
+)
+
+func startExecutionTracerTask(ctx context.Context, name string) (context.Context, func()) {
+ if !t.IsEnabled() {
+ // Avoid additional overhead if
+ // runtime/trace is not enabled.
+ return ctx, func() {}
+ }
+ nctx, task := t.NewTask(ctx, name)
+ return nctx, task.End
+}
diff --git a/vendor/go.opencensus.io/trace/trace_nongo11.go b/vendor/go.opencensus.io/trace/trace_nongo11.go
new file mode 100644
index 0000000..e254198
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/trace_nongo11.go
@@ -0,0 +1,25 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !go1.11
+
+package trace
+
+import (
+ "context"
+)
+
+func startExecutionTracerTask(ctx context.Context, name string) (context.Context, func()) {
+ return ctx, func() {}
+}
diff --git a/vendor/go.opencensus.io/trace/tracestate/tracestate.go b/vendor/go.opencensus.io/trace/tracestate/tracestate.go
new file mode 100644
index 0000000..2d6c713
--- /dev/null
+++ b/vendor/go.opencensus.io/trace/tracestate/tracestate.go
@@ -0,0 +1,147 @@
+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package tracestate implements support for the Tracestate header of the
+// W3C TraceContext propagation format.
+package tracestate
+
+import (
+ "fmt"
+ "regexp"
+)
+
+const (
+ keyMaxSize = 256
+ valueMaxSize = 256
+ maxKeyValuePairs = 32
+)
+
+const (
+ keyWithoutVendorFormat = `[a-z][_0-9a-z\-\*\/]{0,255}`
+ keyWithVendorFormat = `[a-z][_0-9a-z\-\*\/]{0,240}@[a-z][_0-9a-z\-\*\/]{0,13}`
+ keyFormat = `(` + keyWithoutVendorFormat + `)|(` + keyWithVendorFormat + `)`
+ valueFormat = `[\x20-\x2b\x2d-\x3c\x3e-\x7e]{0,255}[\x21-\x2b\x2d-\x3c\x3e-\x7e]`
+)
+
+var keyValidationRegExp = regexp.MustCompile(`^(` + keyFormat + `)$`)
+var valueValidationRegExp = regexp.MustCompile(`^(` + valueFormat + `)$`)
+
+// Tracestate represents tracing-system specific context in a list of key-value pairs. Tracestate allows different
+// vendors propagate additional information and inter-operate with their legacy Id formats.
+type Tracestate struct {
+ entries []Entry
+}
+
+// Entry represents one key-value pair in a list of key-value pair of Tracestate.
+type Entry struct {
+ // Key is an opaque string up to 256 characters printable. It MUST begin with a lowercase letter,
+ // and can only contain lowercase letters a-z, digits 0-9, underscores _, dashes -, asterisks *, and
+ // forward slashes /.
+ Key string
+
+ // Value is an opaque string up to 256 characters printable ASCII RFC0020 characters (i.e., the
+ // range 0x20 to 0x7E) except comma , and =.
+ Value string
+}
+
+// Entries returns a slice of Entry.
+func (ts *Tracestate) Entries() []Entry {
+ if ts == nil {
+ return nil
+ }
+ return ts.entries
+}
+
+func (ts *Tracestate) remove(key string) *Entry {
+ for index, entry := range ts.entries {
+ if entry.Key == key {
+ ts.entries = append(ts.entries[:index], ts.entries[index+1:]...)
+ return &entry
+ }
+ }
+ return nil
+}
+
+func (ts *Tracestate) add(entries []Entry) error {
+ for _, entry := range entries {
+ ts.remove(entry.Key)
+ }
+ if len(ts.entries)+len(entries) > maxKeyValuePairs {
+ return fmt.Errorf("adding %d key-value pairs to current %d pairs exceeds the limit of %d",
+ len(entries), len(ts.entries), maxKeyValuePairs)
+ }
+ ts.entries = append(entries, ts.entries...)
+ return nil
+}
+
+func isValid(entry Entry) bool {
+ return keyValidationRegExp.MatchString(entry.Key) &&
+ valueValidationRegExp.MatchString(entry.Value)
+}
+
+func containsDuplicateKey(entries ...Entry) (string, bool) {
+ keyMap := make(map[string]int)
+ for _, entry := range entries {
+ if _, ok := keyMap[entry.Key]; ok {
+ return entry.Key, true
+ }
+ keyMap[entry.Key] = 1
+ }
+ return "", false
+}
+
+func areEntriesValid(entries ...Entry) (*Entry, bool) {
+ for _, entry := range entries {
+ if !isValid(entry) {
+ return &entry, false
+ }
+ }
+ return nil, true
+}
+
+// New creates a Tracestate object from a parent and/or entries (key-value pair).
+// Entries from the parent are copied if present. The entries passed to this function
+// are inserted in front of those copied from the parent. If an entry copied from the
+// parent contains the same key as one of the entry in entries then the entry copied
+// from the parent is removed. See add func.
+//
+// An error is returned with nil Tracestate if
+// 1. one or more entry in entries is invalid.
+// 2. two or more entries in the input entries have the same key.
+// 3. the number of entries combined from the parent and the input entries exceeds maxKeyValuePairs.
+// (duplicate entry is counted only once).
+func New(parent *Tracestate, entries ...Entry) (*Tracestate, error) {
+ if parent == nil && len(entries) == 0 {
+ return nil, nil
+ }
+ if entry, ok := areEntriesValid(entries...); !ok {
+ return nil, fmt.Errorf("key-value pair {%s, %s} is invalid", entry.Key, entry.Value)
+ }
+
+ if key, duplicate := containsDuplicateKey(entries...); duplicate {
+ return nil, fmt.Errorf("contains duplicate keys (%s)", key)
+ }
+
+ tracestate := Tracestate{}
+
+ if parent != nil && len(parent.entries) > 0 {
+ tracestate.entries = append([]Entry{}, parent.entries...)
+ }
+
+ err := tracestate.add(entries)
+ if err != nil {
+ return nil, err
+ }
+ return &tracestate, nil
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index cb04a61..ab65970 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -5,20 +5,26 @@
{
"checksumSHA1": "pLvPnUablirQucyALgrso9hLG4E=",
"path": "git.autistici.org/ai3/go-common",
- "revision": "2fd6e256a27812c8dab4cce19b756213ce8c69bf",
- "revisionTime": "2018-11-16T09:25:50Z"
+ "revision": "1f95fcdd58ebf63d338f05ceae29d2de811a2d2f",
+ "revisionTime": "2018-11-18T16:11:30Z"
},
{
- "checksumSHA1": "HtRAXnw4/i/jVoa5d3arp34Uerw=",
+ "checksumSHA1": "1ChQcW9Biu/AgiKjsbJFg/+WhjQ=",
"path": "git.autistici.org/ai3/go-common/clientutil",
- "revision": "2fd6e256a27812c8dab4cce19b756213ce8c69bf",
- "revisionTime": "2018-11-16T09:25:50Z"
+ "revision": "1f95fcdd58ebf63d338f05ceae29d2de811a2d2f",
+ "revisionTime": "2018-11-18T16:11:30Z"
},
{
- "checksumSHA1": "RyFydcBJvLBevfsriijLqHtZ0hs=",
+ "checksumSHA1": "TKGUNmKxj7KH3qhwiCh/6quUnwc=",
"path": "git.autistici.org/ai3/go-common/serverutil",
- "revision": "2fd6e256a27812c8dab4cce19b756213ce8c69bf",
- "revisionTime": "2018-11-16T09:25:50Z"
+ "revision": "1f95fcdd58ebf63d338f05ceae29d2de811a2d2f",
+ "revisionTime": "2018-11-18T16:11:30Z"
+ },
+ {
+ "checksumSHA1": "WvuSF0pz3rk7bu+5g9lqTqq97Ow=",
+ "path": "git.autistici.org/ai3/go-common/tracing",
+ "revision": "1f95fcdd58ebf63d338f05ceae29d2de811a2d2f",
+ "revisionTime": "2018-11-18T16:11:30Z"
},
{
"checksumSHA1": "rcWTaHvwTmKqbl8NqUF/nDsHzk8=",
@@ -152,6 +158,42 @@
"revision": "a2f39d5a9b15ecc1fa1005b6aae73cd83da240ef",
"revisionTime": "2017-09-06T15:25:53Z"
},
+ {
+ "checksumSHA1": "LnyXWrTqeu9HH+yNzKYn2tg+S2g=",
+ "path": "github.com/openzipkin/zipkin-go",
+ "revision": "3793c981d4f621c0e3eb1457acffa2c1cc591384",
+ "revisionTime": "2018-11-07T13:50:50Z"
+ },
+ {
+ "checksumSHA1": "1n86VLjqoF28QnbVkZm48BXMjjM=",
+ "path": "github.com/openzipkin/zipkin-go/idgenerator",
+ "revision": "3793c981d4f621c0e3eb1457acffa2c1cc591384",
+ "revisionTime": "2018-11-07T13:50:50Z"
+ },
+ {
+ "checksumSHA1": "Pcem82MuBFP2dauH1emyRaXhYIM=",
+ "path": "github.com/openzipkin/zipkin-go/model",
+ "revision": "3793c981d4f621c0e3eb1457acffa2c1cc591384",
+ "revisionTime": "2018-11-07T13:50:50Z"
+ },
+ {
+ "checksumSHA1": "dkd7Sltl3omwaIt2nMA3rNr10GM=",
+ "path": "github.com/openzipkin/zipkin-go/propagation",
+ "revision": "3793c981d4f621c0e3eb1457acffa2c1cc591384",
+ "revisionTime": "2018-11-07T13:50:50Z"
+ },
+ {
+ "checksumSHA1": "/vKln074gYI1JVb20zv0Kfwm+68=",
+ "path": "github.com/openzipkin/zipkin-go/reporter",
+ "revision": "3793c981d4f621c0e3eb1457acffa2c1cc591384",
+ "revisionTime": "2018-11-07T13:50:50Z"
+ },
+ {
+ "checksumSHA1": "aNAxfa1W/33dQP+iO+hyFmyhRkE=",
+ "path": "github.com/openzipkin/zipkin-go/reporter/http",
+ "revision": "3793c981d4f621c0e3eb1457acffa2c1cc591384",
+ "revisionTime": "2018-11-07T13:50:50Z"
+ },
{
"checksumSHA1": "N6I3i0LIjQckurgTeH3b2A5YTec=",
"path": "github.com/oschwald/maxminddb-golang",
@@ -254,6 +296,96 @@
"revision": "c46b9c6b15141e1c75d096258e560996b68ef8cb",
"revisionTime": "2016-12-26T07:54:37Z"
},
+ {
+ "checksumSHA1": "C9EIZQEMR5q5zVZCo1OtPWSV39I=",
+ "path": "go.opencensus.io",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "TA3C6+5PM7V2zbsnLMp13Efy/BA=",
+ "path": "go.opencensus.io/exemplar",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "9TNs1Fhq3e9Xw4XdvxaKjZk0W48=",
+ "path": "go.opencensus.io/exporter/zipkin",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "BhwWPIG9k2gelU3zEOkhKdedctk=",
+ "path": "go.opencensus.io/internal",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "Vcwr4P/uIN4haoJPglU7liURepM=",
+ "path": "go.opencensus.io/internal/tagencoding",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "kxVcsHl3DWhTdSZkterTpRFQRIs=",
+ "path": "go.opencensus.io/plugin/ochttp",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "0OVZlXVUMGzf8ddlnjg2yMZI4ao=",
+ "path": "go.opencensus.io/plugin/ochttp/propagation/b3",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "9Qm9NNFLaZ8KM3pv4lIBSsD4q3A=",
+ "path": "go.opencensus.io/stats",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "SEHKoV2p561oIgFTqzQ67a/XU7I=",
+ "path": "go.opencensus.io/stats/internal",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "KVJAD8BjQ045mOPz/mAWbPXMlIU=",
+ "path": "go.opencensus.io/stats/view",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "/xIgvCFhYpV43FT16tNBTbm7MeY=",
+ "path": "go.opencensus.io/tag",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "LFehOdQ0p2mKk0rpV1FaQTq4UwU=",
+ "path": "go.opencensus.io/trace",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "0P3BycP6CFnFNRCnF4dTlMEJgEI=",
+ "path": "go.opencensus.io/trace/internal",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "FHJParRi8f1GHO7Cx+lk3bMWBq0=",
+ "path": "go.opencensus.io/trace/propagation",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
+ {
+ "checksumSHA1": "UHbxxaMqpEPsubh8kPwzSlyEwqI=",
+ "path": "go.opencensus.io/trace/tracestate",
+ "revision": "91a0276ece6ad4cbdc4b46116f88d2b47a5f58e5",
+ "revisionTime": "2018-11-12T17:26:09Z"
+ },
{
"checksumSHA1": "2LpxYGSf068307b7bhAuVjvzLLc=",
"path": "golang.org/x/crypto/ed25519",
--
GitLab