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Ensure pprof endpoint is listening on startup #17028

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merged 6 commits into from
Mar 18, 2020
Merged

Ensure pprof endpoint is listening on startup #17028

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ebb1207
Ensure pprof endpoint is listening on startup
jsoriano Mar 16, 2020
7a2f23b
Log fatal errors when starting profilers
jsoriano Mar 16, 2020
6dae231
Add changelog entry
jsoriano Mar 16, 2020
3cd26bf
Remove global logger from libbeat service
jsoriano Mar 16, 2020
c46d36a
Merge remote-tracking branch 'origin/master' into pprof-endpoint-init…
jsoriano Mar 17, 2020
2c8252b
Nit. Don't use var
jsoriano Mar 17, 2020
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30 changes: 19 additions & 11 deletions libbeat/service/service.go
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ import (
"flag"
"fmt"
"log"
"net"
"net/http"
_ "net/http/pprof"
"os"
Expand Down Expand Up @@ -97,24 +98,31 @@ func BeforeRun() {

if *httpprof != "" {
logp.Info("start pprof endpoint")
go func() {
mux := http.NewServeMux()
mux := http.NewServeMux()

// register pprof handler
mux.HandleFunc("/debug/pprof/", func(w http.ResponseWriter, r *http.Request) {
http.DefaultServeMux.ServeHTTP(w, r)
})
// Register pprof handler
mux.HandleFunc("/debug/pprof/", func(w http.ResponseWriter, r *http.Request) {
http.DefaultServeMux.ServeHTTP(w, r)
})

// register metrics handler
mux.HandleFunc("/debug/vars", metricsHandler)
// Register metrics handler
mux.HandleFunc("/debug/vars", metricsHandler)

endpoint := http.ListenAndServe(*httpprof, mux)
logp.Info("finished pprof endpoint: %v", endpoint)
// Ensure we are listening before returning
listener, err := net.Listen("tcp", *httpprof)
if err != nil {
log.Fatalf("Failed to start stats listener: %v", err)
}

go func() {
// Serve returns always a non-nil error
err := http.Serve(listener, mux)
logp.Info("Finished pprof endpoint: %v", err)
}()
}
}

// report expvar and all libbeat/monitoring metrics
// metricsHandler reports expvar and all libbeat/monitoring metrics
func metricsHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")

Expand Down