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vendor/go.opencensus.io/stats/record.go deleted 100644 → 0
View file @ 305f3cb4
// 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/metric/metricdata"
"go.opencensus.io/stats/internal"
"go.opencensus.io/tag"
)
func init() {
internal.SubscriptionReporter = func(measure string) {
mu.Lock()
measures[measure].subscribe()
mu.Unlock()
}
}
// Recorder provides an interface for exporting measurement information from
// the static Record method by using the WithRecorder option.
type Recorder interface {
// Record records a set of measurements associated with the given tags and attachments.
// The second argument is a `[]Measurement`.
Record(*tag.Map, interface{}, map[string]interface{})
}
type recordOptions struct {
attachments metricdata.Attachments
mutators []tag.Mutator
measurements []Measurement
recorder Recorder
}
// WithAttachments applies provided exemplar attachments.
func WithAttachments(attachments metricdata.Attachments) Options {
return func(ro *recordOptions) {
ro.attachments = attachments
}
}
// WithTags applies provided tag mutators.
func WithTags(mutators ...tag.Mutator) Options {
return func(ro *recordOptions) {
ro.mutators = mutators
}
}
// WithMeasurements applies provided measurements.
func WithMeasurements(measurements ...Measurement) Options {
return func(ro *recordOptions) {
ro.measurements = measurements
}
}
// WithRecorder records the measurements to the specified `Recorder`, rather
// than to the global metrics recorder.
func WithRecorder(meter Recorder) Options {
return func(ro *recordOptions) {
ro.recorder = meter
}
}
// Options apply changes to recordOptions.
type Options func(*recordOptions)
func createRecordOption(ros ...Options) *recordOptions {
o := &recordOptions{}
for _, ro := range ros {
ro(o)
}
return o
}
// 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) {
RecordWithOptions(ctx, WithMeasurements(ms...))
}
// 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 {
return RecordWithOptions(ctx, WithTags(mutators...), WithMeasurements(ms...))
}
// RecordWithOptions records measurements from the given options (if any) against context
// and tags and attachments in the options (if any).
// If there are any tags in the context, measurements will be tagged with them.
func RecordWithOptions(ctx context.Context, ros ...Options) error {
o := createRecordOption(ros...)
if len(o.measurements) == 0 {
return nil
}
recorder := internal.DefaultRecorder
if o.recorder != nil {
recorder = o.recorder.Record
}
if recorder == nil {
return nil
}
record := false
for _, m := range o.measurements {
if m.desc.subscribed() {
record = true
break
}
}
if !record {
return nil
}
if len(o.mutators) > 0 {
var err error
if ctx, err = tag.New(ctx, o.mutators...); err != nil {
return err
}
}
recorder(tag.FromContext(ctx), o.measurements, o.attachments)
return nil
}
vendor/go.opencensus.io/stats/view/aggregation.go deleted 100644 → 0
View file @ 305f3cb4
// 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 "time"
// 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(time.Time) AggregationData
}
var (
aggCount = &Aggregation{
Type: AggTypeCount,
newData: func(t time.Time) AggregationData {
return &CountData{Start: t}
},
}
aggSum = &Aggregation{
Type: AggTypeSum,
newData: func(t time.Time) AggregationData {
return &SumData{Start: t}
},
}
)
// 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.
//
// A 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 {
agg := &Aggregation{
Type: AggTypeDistribution,
Buckets: bounds,
}
agg.newData = func(t time.Time) AggregationData {
return newDistributionData(agg, t)
}
return agg
}
// 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(_ time.Time) AggregationData {
return &LastValueData{}
},
}
}
vendor/go.opencensus.io/stats/view/aggregation_data.go deleted 100644 → 0
View file @ 305f3cb4
// 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"
"time"
"go.opencensus.io/metric/metricdata"
)
// 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(v float64, attachments map[string]interface{}, t time.Time)
clone() AggregationData
equal(other AggregationData) bool
toPoint(t metricdata.Type, time time.Time) metricdata.Point
StartTime() time.Time
}
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 {
Start time.Time
Value int64
}
func (a *CountData) isAggregationData() bool { return true }
func (a *CountData) addSample(_ float64, _ map[string]interface{}, _ time.Time) {
a.Value = a.Value + 1
}
func (a *CountData) clone() AggregationData {
return &CountData{Value: a.Value, Start: a.Start}
}
func (a *CountData) equal(other AggregationData) bool {
a2, ok := other.(*CountData)
if !ok {
return false
}
return a.Start.Equal(a2.Start) && a.Value == a2.Value
}
func (a *CountData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeInt64:
return metricdata.NewInt64Point(t, a.Value)
default:
panic("unsupported metricdata.Type")
}
}
// StartTime returns the start time of the data being aggregated by CountData.
func (a *CountData) StartTime() time.Time {
return a.Start
}
// 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 {
Start time.Time
Value float64
}
func (a *SumData) isAggregationData() bool { return true }
func (a *SumData) addSample(v float64, _ map[string]interface{}, _ time.Time) {
a.Value += v
}
func (a *SumData) clone() AggregationData {
return &SumData{Value: a.Value, Start: a.Start}
}
func (a *SumData) equal(other AggregationData) bool {
a2, ok := other.(*SumData)
if !ok {
return false
}
return a.Start.Equal(a2.Start) && math.Pow(a.Value-a2.Value, 2) < epsilon
}
func (a *SumData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeInt64:
return metricdata.NewInt64Point(t, int64(a.Value))
case metricdata.TypeCumulativeFloat64:
return metricdata.NewFloat64Point(t, a.Value)
default:
panic("unsupported metricdata.Type")
}
}
// StartTime returns the start time of the data being aggregated by SumData.
func (a *SumData) StartTime() time.Time {
return a.Start
}
// 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 []*metricdata.Exemplar
bounds []float64 // histogram distribution of the values
Start time.Time
}
func newDistributionData(agg *Aggregation, t time.Time) *DistributionData {
bucketCount := len(agg.Buckets) + 1
return &DistributionData{
CountPerBucket: make([]int64, bucketCount),
ExemplarsPerBucket: make([]*metricdata.Exemplar, bucketCount),
bounds: agg.Buckets,
Min: math.MaxFloat64,
Max: math.SmallestNonzeroFloat64,
Start: t,
}
}
// 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 }
// TODO(songy23): support exemplar attachments.
func (a *DistributionData) addSample(v float64, attachments map[string]interface{}, t time.Time) {
if v < a.Min {
a.Min = v
}
if v > a.Max {
a.Max = v
}
a.Count++
a.addToBucket(v, attachments, t)
if a.Count == 1 {
a.Mean = v
return
}
oldMean := a.Mean
a.Mean = a.Mean + (v-a.Mean)/float64(a.Count)
a.SumOfSquaredDev = a.SumOfSquaredDev + (v-oldMean)*(v-a.Mean)
}
func (a *DistributionData) addToBucket(v float64, attachments map[string]interface{}, t time.Time) {
var count *int64
var i int
var b float64
for i, b = range a.bounds {
if v < b {
count = &a.CountPerBucket[i]
break
}
}
if count == nil { // Last bucket.
i = len(a.bounds)
count = &a.CountPerBucket[i]
}
*count++
if exemplar := getExemplar(v, attachments, t); exemplar != nil {
a.ExemplarsPerBucket[i] = exemplar
}
}
func getExemplar(v float64, attachments map[string]interface{}, t time.Time) *metricdata.Exemplar {
if len(attachments) == 0 {
return nil
}
return &metricdata.Exemplar{
Value: v,
Timestamp: t,
Attachments: attachments,
}
}
func (a *DistributionData) clone() AggregationData {
c := *a
c.CountPerBucket = append([]int64(nil), a.CountPerBucket...)
c.ExemplarsPerBucket = append([]*metricdata.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.Start.Equal(a2.Start) &&
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
}
func (a *DistributionData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeDistribution:
buckets := []metricdata.Bucket{}
for i := 0; i < len(a.CountPerBucket); i++ {
buckets = append(buckets, metricdata.Bucket{
Count: a.CountPerBucket[i],
Exemplar: a.ExemplarsPerBucket[i],
})
}
bucketOptions := &metricdata.BucketOptions{Bounds: a.bounds}
val := &metricdata.Distribution{
Count: a.Count,
Sum: a.Sum(),
SumOfSquaredDeviation: a.SumOfSquaredDev,
BucketOptions: bucketOptions,
Buckets: buckets,
}
return metricdata.NewDistributionPoint(t, val)
default:
// TODO: [rghetia] when we have a use case for TypeGaugeDistribution.
panic("unsupported metricdata.Type")
}
}
// StartTime returns the start time of the data being aggregated by DistributionData.
func (a *DistributionData) StartTime() time.Time {
return a.Start
}
// 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(v float64, _ map[string]interface{}, _ time.Time) {
l.Value = v
}
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
}
func (l *LastValueData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeGaugeInt64:
return metricdata.NewInt64Point(t, int64(l.Value))
case metricdata.TypeGaugeFloat64:
return metricdata.NewFloat64Point(t, l.Value)
default:
panic("unsupported metricdata.Type")
}
}
// StartTime returns an empty time value as start time is not recorded when using last value
// aggregation.
func (l *LastValueData) StartTime() time.Time {
return time.Time{}
}
// ClearStart clears the Start field from data if present. Useful for testing in cases where the
// start time will be nondeterministic.
func ClearStart(data AggregationData) {
switch data := data.(type) {
case *CountData:
data.Start = time.Time{}
case *SumData:
data.Start = time.Time{}
case *DistributionData:
data.Start = time.Time{}
}
}
vendor/go.opencensus.io/stats/view/collector.go deleted 100644 → 0
View file @ 305f3cb4
// 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"
"time"
"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, v float64, attachments map[string]interface{}, t time.Time) {
aggregator, ok := c.signatures[s]
if !ok {
aggregator = c.a.newData(t)
c.signatures[s] = aggregator
}
aggregator.addSample(v, attachments, t)
}
// 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
}
vendor/go.opencensus.io/stats/view/doc.go deleted 100644 → 0
View file @ 305f3cb4
// 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 registered 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.
vendor/go.opencensus.io/stats/view/export.go deleted 100644 → 0
View file @ 305f3cb4
// 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
// 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) {
defaultWorker.RegisterExporter(e)
}
// UnregisterExporter unregisters an exporter.
func UnregisterExporter(e Exporter) {
defaultWorker.UnregisterExporter(e)
}
vendor/go.opencensus.io/stats/view/view.go deleted 100644 → 0
View file @ 305f3cb4
// 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"
"errors"
"fmt"
"reflect"
"sort"
"sync/atomic"
"time"
"go.opencensus.io/metric/metricdata"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
)
// View allows users to aggregate the recorded stats.Measurements.
// Views need to be passed to the Register function 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 to 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()
}
// ErrNegativeBucketBounds error returned if histogram contains negative bounds.
//
// Deprecated: this should not be public.
var ErrNegativeBucketBounds = errors.New("negative bucket bounds not supported")
// 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()
})
sort.Float64s(v.Aggregation.Buckets)
for _, b := range v.Aggregation.Buckets {
if b < 0 {
return ErrNegativeBucketBounds
}
}
// drop 0 bucket silently.
v.Aggregation.Buckets = dropZeroBounds(v.Aggregation.Buckets...)
return nil
}
func dropZeroBounds(bounds ...float64) []float64 {
for i, bound := range bounds {
if bound > 0 {
return bounds[i:]
}
}
return []float64{}
}
// 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
metricDescriptor *metricdata.Descriptor
}
func newViewInternal(v *View) (*viewInternal, error) {
return &viewInternal{
view: v,
collector: &collector{make(map[string]AggregationData), v.Aggregation},
metricDescriptor: viewToMetricDescriptor(v),
}, 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, val float64, attachments map[string]interface{}, t time.Time) {
if !v.isSubscribed() {
return
}
sig := string(encodeWithKeys(m, v.view.TagKeys))
v.collector.addSample(sig, val, attachments, t)
}
// 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 if 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)
}
const maxNameLength = 255
// Returns true if the given string contains only printable characters.
func isPrintable(str string) bool {
for _, r := range str {
if !(r >= ' ' && r <= '~') {
return false
}
}
return true
}
func checkViewName(name string) error {
if len(name) > maxNameLength {
return fmt.Errorf("view name cannot be larger than %v", maxNameLength)
}
if !isPrintable(name) {
return fmt.Errorf("view name needs to be an ASCII string")
}
return nil
}
vendor/go.opencensus.io/stats/view/view_to_metric.go deleted 100644 → 0
View file @ 305f3cb4
// Copyright 2019, 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 (
"time"
"go.opencensus.io/resource"
"go.opencensus.io/metric/metricdata"
"go.opencensus.io/stats"
)
func getUnit(unit string) metricdata.Unit {
switch unit {
case "1":
return metricdata.UnitDimensionless
case "ms":
return metricdata.UnitMilliseconds
case "By":
return metricdata.UnitBytes
}
return metricdata.UnitDimensionless
}
func getType(v *View) metricdata.Type {
m := v.Measure
agg := v.Aggregation
switch agg.Type {
case AggTypeSum:
switch m.(type) {
case *stats.Int64Measure:
return metricdata.TypeCumulativeInt64
case *stats.Float64Measure:
return metricdata.TypeCumulativeFloat64
default:
panic("unexpected measure type")
}
case AggTypeDistribution:
return metricdata.TypeCumulativeDistribution
case AggTypeLastValue:
switch m.(type) {
case *stats.Int64Measure:
return metricdata.TypeGaugeInt64
case *stats.Float64Measure:
return metricdata.TypeGaugeFloat64
default:
panic("unexpected measure type")
}
case AggTypeCount:
switch m.(type) {
case *stats.Int64Measure:
return metricdata.TypeCumulativeInt64
case *stats.Float64Measure:
return metricdata.TypeCumulativeInt64
default:
panic("unexpected measure type")
}
default:
panic("unexpected aggregation type")
}
}
func getLabelKeys(v *View) []metricdata.LabelKey {
labelKeys := []metricdata.LabelKey{}
for _, k := range v.TagKeys {
labelKeys = append(labelKeys, metricdata.LabelKey{Key: k.Name()})
}
return labelKeys
}
func viewToMetricDescriptor(v *View) *metricdata.Descriptor {
return &metricdata.Descriptor{
Name: v.Name,
Description: v.Description,
Unit: convertUnit(v),
Type: getType(v),
LabelKeys: getLabelKeys(v),
}
}
func convertUnit(v *View) metricdata.Unit {
switch v.Aggregation.Type {
case AggTypeCount:
return metricdata.UnitDimensionless
default:
return getUnit(v.Measure.Unit())
}
}
func toLabelValues(row *Row, expectedKeys []metricdata.LabelKey) []metricdata.LabelValue {
labelValues := []metricdata.LabelValue{}
tagMap := make(map[string]string)
for _, tag := range row.Tags {
tagMap[tag.Key.Name()] = tag.Value
}
for _, key := range expectedKeys {
if val, ok := tagMap[key.Key]; ok {
labelValues = append(labelValues, metricdata.NewLabelValue(val))
} else {
labelValues = append(labelValues, metricdata.LabelValue{})
}
}
return labelValues
}
func rowToTimeseries(v *viewInternal, row *Row, now time.Time) *metricdata.TimeSeries {
return &metricdata.TimeSeries{
Points: []metricdata.Point{row.Data.toPoint(v.metricDescriptor.Type, now)},
LabelValues: toLabelValues(row, v.metricDescriptor.LabelKeys),
StartTime: row.Data.StartTime(),
}
}
func viewToMetric(v *viewInternal, r *resource.Resource, now time.Time) *metricdata.Metric {
rows := v.collectedRows()
if len(rows) == 0 {
return nil
}
ts := []*metricdata.TimeSeries{}
for _, row := range rows {
ts = append(ts, rowToTimeseries(v, row, now))
}
m := &metricdata.Metric{
Descriptor: *v.metricDescriptor,
TimeSeries: ts,
Resource: r,
}
return m
}
vendor/go.opencensus.io/stats/view/worker.go deleted 100644 → 0
View file @ 305f3cb4
// 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"
"sync"
"time"
"go.opencensus.io/resource"
"go.opencensus.io/metric/metricdata"
"go.opencensus.io/metric/metricproducer"
"go.opencensus.io/stats"
"go.opencensus.io/stats/internal"
"go.opencensus.io/tag"
)
func init() {
defaultWorker = NewMeter().(*worker)
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
viewStartTimes map[*viewInternal]time.Time
timer *time.Ticker
c chan command
quit, done chan bool
mu sync.RWMutex
r *resource.Resource
exportersMu sync.RWMutex
exporters map[Exporter]struct{}
}
// Meter defines an interface which allows a single process to maintain
// multiple sets of metrics exports (intended for the advanced case where a
// single process wants to report metrics about multiple objects, such as
// multiple databases or HTTP services).
//
// Note that this is an advanced use case, and the static functions in this
// module should cover the common use cases.
type Meter interface {
stats.Recorder
// Find returns a registered view associated with this name.
// If no registered view is found, nil is returned.
Find(name string) *View
// Register begins collecting data for the given views.
// Once a view is registered, it reports data to the registered exporters.
Register(views ...*View) error
// 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.
Unregister(views ...*View)
// 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.
SetReportingPeriod(time.Duration)
// 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.
RegisterExporter(Exporter)
// UnregisterExporter unregisters an exporter.
UnregisterExporter(Exporter)
// SetResource may be used to set the Resource associated with this registry.
// This is intended to be used in cases where a single process exports metrics
// for multiple Resources, typically in a multi-tenant situation.
SetResource(*resource.Resource)
// Start causes the Meter to start processing Record calls and aggregating
// statistics as well as exporting data.
Start()
// Stop causes the Meter to stop processing calls and terminate data export.
Stop()
// RetrieveData gets a snapshot of the data collected for the the view registered
// with the given name. It is intended for testing only.
RetrieveData(viewName string) ([]*Row, error)
}
var _ Meter = (*worker)(nil)
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) {
return defaultWorker.Find(name)
}
// Find returns a registered view associated with this name.
// If no registered view is found, nil is returned.
func (w *worker) Find(name string) (v *View) {
req := &getViewByNameReq{
name: name,
c: make(chan *getViewByNameResp),
}
w.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 {
return defaultWorker.Register(views...)
}
// Register begins collecting data for the given views.
// Once a view is registered, it reports data to the registered exporters.
func (w *worker) Register(views ...*View) error {
req := &registerViewReq{
views: views,
err: make(chan error),
}
w.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) {
defaultWorker.Unregister(views...)
}
// 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 (w *worker) 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{}),
}
w.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) {
return defaultWorker.RetrieveData(viewName)
}
// RetrieveData gets a snapshot of the data collected for the the view registered
// with the given name. It is intended for testing only.
func (w *worker) RetrieveData(viewName string) ([]*Row, error) {
req := &retrieveDataReq{
now: time.Now(),
v: viewName,
c: make(chan *retrieveDataResp),
}
w.c <- req
resp := <-req.c
return resp.rows, resp.err
}
func record(tags *tag.Map, ms interface{}, attachments map[string]interface{}) {
defaultWorker.Record(tags, ms, attachments)
}
// Record records a set of measurements ms associated with the given tags and attachments.
func (w *worker) Record(tags *tag.Map, ms interface{}, attachments map[string]interface{}) {
req := &recordReq{
tm: tags,
ms: ms.([]stats.Measurement),
attachments: attachments,
t: time.Now(),
}
w.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) {
defaultWorker.SetReportingPeriod(d)
}
// 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 (w *worker) 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),
}
w.c <- req
<-req.c // don't return until the timer is set to the new duration.
}
// NewMeter constructs a Meter instance. You should only need to use this if
// you need to separate out Measurement recordings and View aggregations within
// a single process.
func NewMeter() Meter {
return &worker{
measures: make(map[string]*measureRef),
views: make(map[string]*viewInternal),
viewStartTimes: make(map[*viewInternal]time.Time),
timer: time.NewTicker(defaultReportingDuration),
c: make(chan command, 1024),
quit: make(chan bool),
done: make(chan bool),
exporters: make(map[Exporter]struct{}),
}
}
// SetResource associates all data collected by this Meter with the specified
// resource. This resource is reported when using metricexport.ReadAndExport;
// it is not provided when used with ExportView/RegisterExporter, because that
// interface does not provide a means for reporting the Resource.
func (w *worker) SetResource(r *resource.Resource) {
w.r = r
}
func (w *worker) Start() {
go w.start()
}
func (w *worker) start() {
prodMgr := metricproducer.GlobalManager()
prodMgr.AddProducer(w)
for {
select {
case cmd := <-w.c:
cmd.handleCommand(w)
case <-w.timer.C:
w.reportUsage()
case <-w.quit:
w.timer.Stop()
close(w.c)
w.done <- true
return
}
}
}
func (w *worker) Stop() {
prodMgr := metricproducer.GlobalManager()
prodMgr.DeleteProducer(w)
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) {
w.mu.Lock()
defer w.mu.Unlock()
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
w.viewStartTimes[vi] = time.Now()
ref := w.getMeasureRef(vi.view.Measure.Name())
ref.views[vi] = struct{}{}
return vi, nil
}
func (w *worker) unregisterView(v *viewInternal) {
w.mu.Lock()
defer w.mu.Unlock()
delete(w.views, v.view.Name)
delete(w.viewStartTimes, v)
if measure := w.measures[v.view.Measure.Name()]; measure != nil {
delete(measure.views, v)
}
}
func (w *worker) reportView(v *viewInternal) {
if !v.isSubscribed() {
return
}
rows := v.collectedRows()
viewData := &Data{
View: v.view,
Start: w.viewStartTimes[v],
End: time.Now(),
Rows: rows,
}
w.exportersMu.Lock()
defer w.exportersMu.Unlock()
for e := range w.exporters {
e.ExportView(viewData)
}
}
func (w *worker) reportUsage() {
w.mu.Lock()
defer w.mu.Unlock()
for _, v := range w.views {
w.reportView(v)
}
}
func (w *worker) toMetric(v *viewInternal, now time.Time) *metricdata.Metric {
if !v.isSubscribed() {
return nil
}
return viewToMetric(v, w.r, now)
}
// Read reads all view data and returns them as metrics.
// It is typically invoked by metric reader to export stats in metric format.
func (w *worker) Read() []*metricdata.Metric {
w.mu.Lock()
defer w.mu.Unlock()
now := time.Now()
metrics := make([]*metricdata.Metric, 0, len(w.views))
for _, v := range w.views {
metric := w.toMetric(v, now)
if metric != nil {
metrics = append(metrics, metric)
}
}
return metrics
}
func (w *worker) RegisterExporter(e Exporter) {
w.exportersMu.Lock()
defer w.exportersMu.Unlock()
w.exporters[e] = struct{}{}
}
func (w *worker) UnregisterExporter(e Exporter) {
w.exportersMu.Lock()
defer w.exportersMu.Unlock()
delete(w.exporters, e)
}
vendor/go.opencensus.io/stats/view/worker_commands.go deleted 100644 → 0
View file @ 305f3cb4
// 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/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) {
for _, v := range cmd.views {
if err := v.canonicalize(); err != nil {
cmd.err <- err
return
}
}
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)
vi.unsubscribe()
if !vi.isSubscribed() {
// this was the last subscription and view is not collecting anymore.
// The collected data can be cleared.
vi.clearRows()
}
w.unregisterView(vi)
}
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) {
w.mu.Lock()
defer w.mu.Unlock()
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]interface{}
t time.Time
}
func (cmd *recordReq) handleCommand(w *worker) {
w.mu.Lock()
defer w.mu.Unlock()
for _, m := range cmd.ms {
if (m == stats.Measurement{}) { // not registered
continue
}
ref := w.getMeasureRef(m.Measure().Name())
for v := range ref.views {
v.addSample(cmd.tm, m.Value(), cmd.attachments, cmd.t)
}
}
}
// 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
}
vendor/go.opencensus.io/tag/key.go deleted 100644 → 0
View file @ 305f3cb4
// 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 more than once 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
}
// MustNewKey returns a key with the given name, and panics if name is an invalid key name.
func MustNewKey(name string) Key {
k, err := NewKey(name)
if err != nil {
panic(err)
}
return k
}
// Name returns the name of the key.
func (k Key) Name() string {
return k.name
}
vendor/go.opencensus.io/tag/map.go deleted 100644 → 0
View file @ 305f3cb4
// 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
}
type tagContent struct {
value string
m metadatas
}
// Map is a map of tags. Use New to create a context containing
// a new Map.
type Map struct {
m map[Key]tagContent
}
// 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.value, 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, md metadatas) {
if _, ok := m.m[k]; ok {
return
}
m.m[k] = tagContent{value: v, m: md}
}
func (m *Map) update(k Key, v string, md metadatas) {
if _, ok := m.m[k]; ok {
m.m[k] = tagContent{value: v, m: md}
}
}
func (m *Map) upsert(k Key, v string, md metadatas) {
m.m[k] = tagContent{value: v, m: md}
}
func (m *Map) delete(k Key) {
delete(m.m, k)
}
func newMap() *Map {
return &Map{m: make(map[Key]tagContent)}
}
// 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.
// Metadata applies metadata to the tag. It is optional.
// Metadatas are applied in the order in which it is provided.
// If more than one metadata updates the same attribute then
// the update from the last metadata prevails.
func Insert(k Key, v string, mds ...Metadata) Mutator {
return &mutator{
fn: func(m *Map) (*Map, error) {
if !checkValue(v) {
return nil, errInvalidValue
}
m.insert(k, v, createMetadatas(mds...))
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.
// Metadata applies metadata to the tag. It is optional.
// Metadatas are applied in the order in which it is provided.
// If more than one metadata updates the same attribute then
// the update from the last metadata prevails.
func Update(k Key, v string, mds ...Metadata) Mutator {
return &mutator{
fn: func(m *Map) (*Map, error) {
if !checkValue(v) {
return nil, errInvalidValue
}
m.update(k, v, createMetadatas(mds...))
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.
// Metadata applies metadata to the tag. It is optional.
// Metadatas are applied in the order in which it is provided.
// If more than one metadata updates the same attribute then
// the update from the last metadata prevails.
func Upsert(k Key, v string, mds ...Metadata) Mutator {
return &mutator{
fn: func(m *Map) (*Map, error) {
if !checkValue(v) {
return nil, errInvalidValue
}
m.upsert(k, v, createMetadatas(mds...))
return m, nil
},
}
}
func createMetadatas(mds ...Metadata) metadatas {
var metas metadatas
if len(mds) > 0 {
for _, md := range mds {
if md != nil {
md(&metas)
}
}
} else {
WithTTL(TTLUnlimitedPropagation)(&metas)
}
return metas
}
// 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.value) {
return ctx, fmt.Errorf("key:%q value:%q: %v", k.Name(), v, errInvalidValue)
}
m.insert(k, v.value, v.m)
}
}
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)
}
vendor/go.opencensus.io/tag/map_codec.go deleted 100644 → 0
View file @ 305f3cb4
// 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 {
if m == nil {
return nil
}
eg := &encoderGRPC{
buf: make([]byte, len(m.m)),
}
eg.writeByte(tagsVersionID)
for k, v := range m.m {
if v.m.ttl.ttl == valueTTLUnlimitedPropagation {
eg.writeByte(byte(keyTypeString))
eg.writeStringWithVarintLen(k.name)
eg.writeBytesWithVarintLen([]byte(v.value))
}
}
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, md metadatas)) 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, createMetadatas(WithTTL(TTLUnlimitedPropagation)))
if err != nil {
return err
}
}
return nil
}
vendor/go.opencensus.io/tag/metadata.go deleted 100644 → 0
View file @ 305f3cb4
// Copyright 2019, 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
const (
// valueTTLNoPropagation prevents tag from propagating.
valueTTLNoPropagation = 0
// valueTTLUnlimitedPropagation allows tag to propagate without any limits on number of hops.
valueTTLUnlimitedPropagation = -1
)
// TTL is metadata that specifies number of hops a tag can propagate.
// Details about TTL metadata is specified at https://github.com/census-instrumentation/opencensus-specs/blob/master/tags/TagMap.md#tagmetadata
type TTL struct {
ttl int
}
var (
// TTLUnlimitedPropagation is TTL metadata that allows tag to propagate without any limits on number of hops.
TTLUnlimitedPropagation = TTL{ttl: valueTTLUnlimitedPropagation}
// TTLNoPropagation is TTL metadata that prevents tag from propagating.
TTLNoPropagation = TTL{ttl: valueTTLNoPropagation}
)
type metadatas struct {
ttl TTL
}
// Metadata applies metadatas specified by the function.
type Metadata func(*metadatas)
// WithTTL applies metadata with provided ttl.
func WithTTL(ttl TTL) Metadata {
return func(m *metadatas) {
m.ttl = ttl
}
}
vendor/go.opencensus.io/trace/basetypes.go deleted 100644 → 0
View file @ 305f3cb4
// 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}
}
// Float64Attribute returns a float64-valued attribute.
func Float64Attribute(key string, value float64) 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 linked span is a child of the current span.
LinkTypeParent // The linked span is the parent of the current 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
}
vendor/go.opencensus.io/trace/config.go deleted 100644 → 0
View file @ 305f3cb4
// 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
// MaxAnnotationEventsPerSpan is max number of annotation events per span
MaxAnnotationEventsPerSpan int
// MaxMessageEventsPerSpan is max number of message events per span
MaxMessageEventsPerSpan int
// MaxAnnotationEventsPerSpan is max number of attributes per span
MaxAttributesPerSpan int
// MaxLinksPerSpan is max number of links per span
MaxLinksPerSpan int
}
var configWriteMu sync.Mutex
const (
// DefaultMaxAnnotationEventsPerSpan is default max number of annotation events per span
DefaultMaxAnnotationEventsPerSpan = 32
// DefaultMaxMessageEventsPerSpan is default max number of message events per span
DefaultMaxMessageEventsPerSpan = 128
// DefaultMaxAttributesPerSpan is default max number of attributes per span
DefaultMaxAttributesPerSpan = 32
// DefaultMaxLinksPerSpan is default max number of links per span
DefaultMaxLinksPerSpan = 32
)
// 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
}
if cfg.MaxAnnotationEventsPerSpan > 0 {
c.MaxAnnotationEventsPerSpan = cfg.MaxAnnotationEventsPerSpan
}
if cfg.MaxMessageEventsPerSpan > 0 {
c.MaxMessageEventsPerSpan = cfg.MaxMessageEventsPerSpan
}
if cfg.MaxAttributesPerSpan > 0 {
c.MaxAttributesPerSpan = cfg.MaxAttributesPerSpan
}
if cfg.MaxLinksPerSpan > 0 {
c.MaxLinksPerSpan = cfg.MaxLinksPerSpan
}
config.Store(&c)
}
vendor/go.opencensus.io/trace/doc.go deleted 100644 → 0
View file @ 305f3cb4
// 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"
vendor/go.opencensus.io/trace/export.go deleted 100644 → 0
View file @ 305f3cb4
// 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
DroppedAttributeCount int
DroppedAnnotationCount int
DroppedMessageEventCount int
DroppedLinkCount int
// ChildSpanCount holds the number of child span created for this span.
ChildSpanCount int
}
vendor/go.opencensus.io/trace/propagation/propagation.go deleted 100644 → 0
View file @ 305f3cb4
// 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.
vendor/go.opencensus.io/trace/sampling.go deleted 100644 → 0
View file @ 305f3cb4
// 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}
}
}