Add go profiling flag, and enable on integration tests (#1382)

cmd/gh-action-integration-generator/main.go

@@ -76,6 +76,12 @@ jobs:
         with:
           name: logs
           path: "control_logs/*.log"
+
+      - uses: actions/upload-artifact@v3
+        if: always() && steps.changed-files.outputs.any_changed == 'true'
+        with:
+          name: pprof
+          path: "control_logs/*.pprof.tar"
 `),
 	)
 )

cmd/headscale/headscale.go

@@ -6,11 +6,25 @@ import (
 
 	"github.com/efekarakus/termcolor"
 	"github.com/juanfont/headscale/cmd/headscale/cli"
+	"github.com/pkg/profile"
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 )
 
 func main() {
+	if _, enableProfile := os.LookupEnv("HEADSCALE_PROFILING_ENABLED"); enableProfile {
+		if profilePath, ok := os.LookupEnv("HEADSCALE_PROFILING_PATH"); ok {
+			err := os.MkdirAll(profilePath, os.ModePerm)
+			if err != nil {
+				log.Fatal().Err(err).Msg("failed to create profiling directory")
+			}
+
+			defer profile.Start(profile.ProfilePath(profilePath)).Stop()
+		} else {
+			defer profile.Start().Stop()
+		}
+	}
+
 	var colors bool
 	switch l := termcolor.SupportLevel(os.Stderr); l {
 	case termcolor.Level16M: