simplify profiler cleanup

main.go

@@ -63,6 +63,9 @@ func init() {
 	// Check if minio was compiled using a supported version of Golang.
 	checkGoVersion()
 
+	// Set global trace flag.
+	globalTrace = os.Getenv("MINIO_TRACE") == "1"
+
 	// It is an unsafe practice to run network services as
 	// root. Containers are an exception.
 	if !isContainerized() && os.Geteuid() == 0 {
@@ -150,31 +153,11 @@ func mustGetProfilePath() string {
 	return filepath.Join(mustGetConfigPath(), globalMinioProfilePath)
 }
 
-func setupProfilingFromEnv(profiler *interface {
-	Stop()
-}) {
-	switch os.Getenv("MINIO_PROFILER") {
-	case "cpu":
-		*profiler = profile.Start(profile.CPUProfile, profile.ProfilePath(mustGetProfilePath()))
-	case "mem":
-		*profiler = profile.Start(profile.MemProfile, profile.ProfilePath(mustGetProfilePath()))
-	case "block":
-		*profiler = profile.Start(profile.BlockProfile, profile.ProfilePath(mustGetProfilePath()))
-	}
-}
-
 func main() {
-	// Set global trace flag.
-	trace := os.Getenv("MINIO_TRACE")
-	globalTrace = trace == "1"
-
 	probe.Init() // Set project's root source path.
 	probe.SetAppInfo("Release-Tag", minioReleaseTag)
 	probe.SetAppInfo("Commit-ID", minioShortCommitID)
 
-	var profiler interface {
-		Stop()
-	}
 	app := registerApp()
 	app.Before = func(c *cli.Context) error {
 		// Sets new config folder.
@@ -209,21 +192,18 @@ func main() {
 			}
 		}
 
-		// Enable profiling supported modes are [cpu, mem, block].
-		// ``MINIO_PROFILER`` supported options are [cpu, mem, block].
-		setupProfilingFromEnv(&profiler)
-
-		// Return here.
 		return nil
 	}
 
-	// Stop profiling on exit.
+	// Enable profiler if ``MINIO_PROFILER`` is set. Supported options are [cpu, mem, block].
-	// N B If any inner function calls os.Exit() the defer(s) stacked wouldn't be called
+	switch os.Getenv("MINIO_PROFILER") {
-	defer func() {
+	case "cpu":
-		if profiler != nil {
+		defer profile.Start(profile.CPUProfile, profile.ProfilePath(mustGetProfilePath())).Stop()
-			profiler.Stop()
+	case "mem":
-		}
+		defer profile.Start(profile.MemProfile, profile.ProfilePath(mustGetProfilePath())).Stop()
-	}()
+	case "block":
+		defer profile.Start(profile.BlockProfile, profile.ProfilePath(mustGetProfilePath())).Stop()
+	}
 
 	// Run the app - exit on error.
 	app.RunAndExitOnError()