92 lines
2.5 KiB
Go
92 lines
2.5 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package process
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import (
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"flag"
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"fmt"
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"net"
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"net/http"
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"net/http/pprof"
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"strings"
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"go.uber.org/zap"
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monkit "gopkg.in/spacemonkeygo/monkit.v2"
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"gopkg.in/spacemonkeygo/monkit.v2/present"
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"storj.io/storj/internal/version"
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)
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var (
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debugAddr = flag.String("debug.addr", "127.0.0.1:0", "address to listen on for debug endpoints")
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)
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func init() {
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// zero out the http.DefaultServeMux net/http/pprof so unhelpfully
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// side-effected.
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*http.DefaultServeMux = http.ServeMux{}
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}
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func initDebug(logger *zap.Logger, r *monkit.Registry) (err error) {
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var mux http.ServeMux
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mux.HandleFunc("/debug/pprof/", pprof.Index)
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mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
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mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
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mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
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mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
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mux.Handle("/version/", http.StripPrefix("/version", http.HandlerFunc(version.DebugHandler)))
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mux.Handle("/mon/", http.StripPrefix("/mon", present.HTTP(r)))
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mux.HandleFunc("/metrics", prometheus)
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mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
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_, _ = fmt.Fprintln(w, "OK")
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})
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if *debugAddr != "" {
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ln, err := net.Listen("tcp", *debugAddr)
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if err != nil {
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return err
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}
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go func() {
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logger.Debug(fmt.Sprintf("debug server listening on %s", ln.Addr().String()))
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err := (&http.Server{Handler: &mux}).Serve(ln)
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if err != nil {
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logger.Error("debug server died", zap.Error(err))
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}
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}()
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}
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return nil
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}
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func sanitize(val string) string {
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// https://prometheus.io/docs/concepts/data_model/
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// specifies all metric names must match [a-zA-Z_:][a-zA-Z0-9_:]*
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// Note: The colons are reserved for user defined recording rules.
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// They should not be used by exporters or direct instrumentation.
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if '0' <= val[0] && val[0] <= '9' {
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val = "_" + val
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}
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return strings.Map(func(r rune) rune {
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switch {
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case 'a' <= r && r <= 'z':
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return r
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case 'A' <= r && r <= 'Z':
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return r
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default:
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return '_'
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}
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}, val)
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}
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func prometheus(w http.ResponseWriter, r *http.Request) {
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// writes https://prometheus.io/docs/instrumenting/exposition_formats/
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// TODO(jt): deeper monkit integration so we can expose prometheus types
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// (https://prometheus.io/docs/concepts/metric_types/)
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monkit.Default.Stats(func(name string, val float64) {
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metric := sanitize(name)
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_, _ = fmt.Fprintf(w, "# HELP %s %s\n%s %g\n",
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metric, strings.ReplaceAll(name, "\n", " "),
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metric, val)
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})
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}
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