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Manager: add profiler support

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Add a `-pprof` CLI option to enable the profiler. It will expose profiler
info on the web interface at `/debug/pprof/`.

To have a nice view of this, including flame graphs, run:

```
go tool pprof -http localhost:8082 http://localhost:8080/debug/pprof/profile
```
This commit is contained in:
Sybren A. Stüvel 2022-07-15 14:43:48 +02:00
parent 904b6c0d73
commit b511fad968
1 changed files with 18 additions and 0 deletions
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18
cmd/flamenco-manager/main.go
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@ -11,10 +11,12 @@ import (
"math/rand"
"net"
"net/http"
http_pprof "net/http/pprof"
"net/url"
"os"
"os/signal"
"runtime"
"runtime/pprof"
"strings"
"sync"
"syscall"
@ -55,6 +57,7 @@ var cliArgs struct {
writeConfig bool
delayResponses bool
firstTimeWizard bool
pprof bool
}
const (
@ -381,6 +384,20 @@ func buildWebService(
return c.Redirect(http.StatusTemporaryRedirect, "/app/")
})
// Register profiler functions.
if cliArgs.pprof {
e.GET("/debug/pprof/", echo.WrapHandler(http.HandlerFunc(http_pprof.Index)))
e.GET("/debug/pprof/cmdline", echo.WrapHandler(http.HandlerFunc(http_pprof.Cmdline)))
e.GET("/debug/pprof/profile", echo.WrapHandler(http.HandlerFunc(http_pprof.Profile)))
e.GET("/debug/pprof/symbol", echo.WrapHandler(http.HandlerFunc(http_pprof.Symbol)))
e.GET("/debug/pprof/trace", echo.WrapHandler(http.HandlerFunc(http_pprof.Trace)))
for _, profile := range pprof.Profiles() {
name := profile.Name()
e.GET("/debug/pprof/"+name, echo.WrapHandler(http_pprof.Handler(name)))
}
log.Info().Msg("profiler debugging info available on /debug/pprof/")
}
// Log available routes
routeLogger := log.Level(zerolog.TraceLevel)
routeLogger.Trace().Msg("available routes:")
@ -476,6 +493,7 @@ func parseCliArgs() {
flag.BoolVar(&cliArgs.delayResponses, "delay", false,
"Add a random delay to any HTTP responses. This aids in development of Flamenco Manager's web frontend.")
flag.BoolVar(&cliArgs.firstTimeWizard, "wizard", false, "Open a webbrowser with the first-time configuration wizard.")
flag.BoolVar(&cliArgs.pprof, "pprof", false, "Expose profiler endpoints on /debug/pprof/.")
flag.Parse()