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Commit c0ff2ab8 authored by ale's avatar ale
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add HTTP debug handlers to radiod 

Enabled by setting the --debug-addr command-line option.
parent c494b7d5
Hide whitespace changes
Inline Side-by-side
cmd/radiod/radiod.go
View file @ c0ff2ab8
......@@ -8,6 +8,9 @@ import (
"strings"
"syscall"
"net/http"
_ "net/http/pprof"
"git.autistici.org/ale/autoradio"
"git.autistici.org/ale/autoradio/instrumentation"
"git.autistici.org/ale/autoradio/node"
......@@ -21,6 +24,7 @@ var (
netDev = flag.String("interface", "", "Network interface to monitor for utilization. If unset, default to the interface associated with --ip.")
bwLimit = flag.Int("bwlimit", 100, "Bandwidth usage limit (Mbps)")
maxClients = flag.Int("max-clients", 1000, "Maximum number of connected clients")
debugAddr = flag.String("debug-addr", "", "Set to a host:port to enable a HTTP server with debugging information")
)
func shortHostname() string {
......@@ -54,5 +58,18 @@ func main() {
}()
signal.Notify(stopch, syscall.SIGTERM, syscall.SIGINT)
if *debugAddr != "" {
http.Handle("/debug/node", n)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" {
http.Redirect(w, r, "/debug/node", 302)
}
http.NotFound(w, r)
})
go func() {
http.ListenAndServe(*debugAddr, nil)
}()
}
n.Run()
}
node/node.go
View file @ c0ff2ab8
......@@ -166,13 +166,18 @@ type RadioNode struct {
// Node presence heartbeat.
presence *presence.Presence
// How often to restart the Icecast daemon.
// Rate limiting for Icecast daemon restarts.
reloadDelay time.Duration
// Generator for transcodingControllers. Exposed as a member
// so that it can be stubbed out during tests.
transcoderFn transcodingControllerFunc
// All currently active transcoders (locked due to the
// async debugging handler).
transcodersMx sync.Mutex
transcoders map[string]*transcoder
// A note on channel types used for signaling: while I
// personally prefer struct{} chans, the etcd interface for
// Watch makes it convenient to use bool stop channels
......@@ -236,6 +241,7 @@ func NewRadioNode(name string, ips, internalIPs []net.IP, netDev string, bwLimit
transcoderFn: func(p *liquidsoapParams) (transcodingController, error) {
return newLiquidsoap(p)
},
transcoders: make(map[string]*transcoder),
reloadDelay: 1000 * time.Millisecond,
bw: bwmonitor.NewBandwidthUsageMonitor(netDev, bwLimit),
maxListeners: maxListeners,
......@@ -286,9 +292,8 @@ func (rc *RadioNode) updater(stop chan bool) {
// Keep track of all the configured transcoders (and clean
// them up at the end).
transcoders := make(map[string]*transcoder)
defer func() {
for _, t := range transcoders {
for _, t := range rc.transcoders {
t.Stop()
}
}()
......@@ -320,8 +325,9 @@ func (rc *RadioNode) updater(stop chan bool) {
// associated transcoder objects. We also need
// to detect changes in the encoding params
// and restart the transcoder if necessary.
rc.transcodersMx.Lock()
tmp := make(map[string]struct{})
for name := range transcoders {
for name := range rc.transcoders {
tmp[name] = struct{}{}
}
for _, m := range rc.config.ListMounts() {
......@@ -330,7 +336,7 @@ func (rc *RadioNode) updater(stop chan bool) {
}
tparams := newLiquidsoapParams(m)
cur, ok := transcoders[m.Name]
cur, ok := rc.transcoders[m.Name]
if ok {
delete(tmp, m.Name)
if cur.Changed(tparams) {
......@@ -343,14 +349,15 @@ func (rc *RadioNode) updater(stop chan bool) {
rc.Log.Printf("could not create transcoder: %v", err)
} else {
t.Start()
transcoders[m.Name] = t
rc.transcoders[m.Name] = t
}
}
}
for name := range tmp {
transcoders[name].Stop()
delete(transcoders, name)
rc.transcoders[name].Stop()
delete(rc.transcoders, name)
}
rc.transcodersMx.Unlock()
// Limit the rate of reconfigurations.
if rc.reloadDelay > 0 {
......
node/node_debug.go 0 → 100644
View file @ c0ff2ab8
package node
import (
"fmt"
"net/http"
"text/template"
)
const debugText = `<html>
<head>
<style type="text/css">
.info th { text-align: right; }
.error { color: red; }
</style>
</head>
<body>
<title>Node status: {{.Name}}</title>
<table class="info">
<tr>
<th>Name:</th>
<td>{{.Name}}</td>
</tr>
<tr>
<th>Master:</th>
<td>{{if .IsMaster}}YES{{else}}NO{{end}}</td>
</tr>
<tr>
<th>Icecast:</th>
<td>{{if .IcecastUp}}OK{{else}}<span class="error">DOWN</span>{{end}}</td>
</tr>
<tr>
<th>Bandwidth:</th>
<td>{{.BandwidthUsage}}%</td>
</tr>
<tr>
<th></th>
<td></td>
</tr>
</table>
<h3>Transcoders</h3>
{{if .Transcoders}}
<table>
<tr>
<th>Source</th>
<th>Target</th>
<th>Mount</th>
<th>Format</th>
<th>Bitrate/Q</th>
</tr>
{{range .Transcoders}}
<tr>
<td>{{.SourceURL}}</td>
<td>{{.TargetIP}}:{{.TargetPort}}</td>
<td>{{.TargetMount}}</td>
<td>{{.Format}}</td>
<td>{{if gt .BitRate 0}}{{.BitRate}}{{else}}{{.Quality}}{{end}}</td>
</tr>
{{end}}
</table>
{{else}}
<p>No active transcoders on this node.</p>
{{end}}
</body>
</html>`
var (
debugTmpl = template.Must(template.New("node debug").Parse(debugText))
)
// ServeHTTP serves the debug console.
func (rc *RadioNode) ServeHTTP(w http.ResponseWriter, r *http.Request) {
rc.transcodersMx.Lock()
var transcoders []*transcoder
for _, t := range rc.transcoders {
transcoders = append(transcoders, t)
}
rc.transcodersMx.Unlock()
ctx := struct {
Name string
IsMaster bool
IcecastUp bool
BandwidthUsage float64
Transcoders []*transcoder
}{
Name: rc.name,
IsMaster: rc.me.IsMaster(),
IcecastUp: rc.icecast.GetStatus().Up,
BandwidthUsage: rc.bw.GetUsage(),
Transcoders: transcoders,
}
err := debugTmpl.Execute(w, &ctx)
if err != nil {
fmt.Fprintln(w, "debug: error executing template: ", err.Error())
}
}
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