mirror of
https://blitiri.com.ar/repos/chasquid
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a08b86a663
This patch moves the monitoring HTTP server code to its own file, for readability purposes only.
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"html/template"
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"net/http"
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"time"
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"blitiri.com.ar/go/log"
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// To enable live profiling in the monitoring server.
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_ "net/http/pprof"
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)
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func launchMonitoringServer(addr string) {
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log.Infof("Monitoring HTTP server listening on %s", addr)
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indexData := struct {
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Version string
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SourceDate time.Time
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StartTime time.Time
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}{
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Version: version,
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SourceDate: sourceDate,
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StartTime: time.Now(),
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}
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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}
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if err := monitoringHTMLIndex.Execute(w, indexData); err != nil {
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log.Infof("monitoring handler error: %v", err)
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}
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})
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flags := dumpFlags()
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http.HandleFunc("/debug/flags", func(w http.ResponseWriter, r *http.Request) {
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_, _ = w.Write([]byte(flags))
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})
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go http.ListenAndServe(addr, nil)
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}
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// Static index for the monitoring website.
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var monitoringHTMLIndex = template.Must(template.New("index").Funcs(
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template.FuncMap{"since": time.Since}).Parse(
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`<!DOCTYPE html>
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<html>
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<head>
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<title>chasquid monitoring</title>
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</head>
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<body>
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<h1>chasquid monitoring</h1>
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chasquid {{.Version}}<br>
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source date {{.SourceDate.Format "2006-01-02 15:04:05 -0700"}}<p>
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started {{.StartTime.Format "Mon, 2006-01-02 15:04:05 -0700"}}<br>
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up since {{.StartTime | since}}<p>
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<ul>
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<li><a href="/debug/queue">queue</a>
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<li><a href="/debug/vars">exported variables</a>
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<small><a href="https://golang.org/pkg/expvar/">(ref)</a></small>
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<li>traces <small><a href="https://godoc.org/golang.org/x/net/trace">
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(ref)</a></small>
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<ul>
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<li><a href="/debug/requests?exp=1">requests (short-lived)</a>
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<li><a href="/debug/events?exp=1">events (long-lived)</a>
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</ul>
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<li><a href="/debug/flags">flags</a>
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<li><a href="/debug/pprof">pprof</a>
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<small><a href="https://golang.org/pkg/net/http/pprof/">
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(ref)</a></small>
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<ul>
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<li><a href="/debug/pprof/goroutine?debug=1">goroutines</a>
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</ul>
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</ul>
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</body>
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</html>
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`))
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// dumpFlags to a string, for troubleshooting purposes.
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func dumpFlags() string {
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s := ""
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visited := make(map[string]bool)
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// Print set flags first, then the rest.
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flag.Visit(func(f *flag.Flag) {
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s += fmt.Sprintf("-%s=%s\n", f.Name, f.Value.String())
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visited[f.Name] = true
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})
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s += "\n"
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flag.VisitAll(func(f *flag.Flag) {
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if !visited[f.Name] {
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s += fmt.Sprintf("-%s=%s\n", f.Name, f.Value.String())
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}
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})
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return s
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}
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