added manger to keep track of go routines in the services (#2869)

- added manager to wait for all go routines to end before exit
- code refactor
- renamed Manafer to Interface and GoRoutineManager to GroupManager
- replaced some go routine calls with manager Add func
- added unit tests for manager

cmd/builder/app/server.go

@@ -24,10 +24,11 @@ import (
 
 	builder "github.com/fission/fission/pkg/builder"
 	"github.com/fission/fission/pkg/utils/httpserver"
+	"github.com/fission/fission/pkg/utils/manager"
 )
 
 // Usage: builder <shared volume path>
-func Run(ctx context.Context, logger *zap.Logger, shareVolume string) {
+func Run(ctx context.Context, logger *zap.Logger, mgr manager.Interface, shareVolume string) {
 	builder := builder.MakeBuilder(logger, shareVolume)
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", builder.Handler)
@@ -35,5 +36,5 @@ func Run(ctx context.Context, logger *zap.Logger, shareVolume string) {
 	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)
 	})
-	httpserver.StartServer(ctx, logger, "builder", "8001", mux)
+	httpserver.StartServer(ctx, logger, mgr, "builder", "8001", mux)
 }

cmd/builder/main.go

@@ -24,15 +24,21 @@ import (
 
 	"github.com/fission/fission/cmd/builder/app"
 	"github.com/fission/fission/pkg/utils/loggerfactory"
+	"github.com/fission/fission/pkg/utils/manager"
 	"github.com/fission/fission/pkg/utils/profile"
 )
 
 // Usage: builder <shared volume path>
 func main() {
+
+	mgr := manager.New()
+	defer mgr.Wait()
+
 	logger := loggerfactory.GetLogger()
 	defer logger.Sync()
 	ctx := signals.SetupSignalHandler()
-	profile.ProfileIfEnabled(ctx, logger)
+	profile.ProfileIfEnabled(ctx, logger, mgr)
+
 	shareVolume := os.Args[1]
 	if _, err := os.Stat(shareVolume); err != nil {
 		if os.IsNotExist(err) {
@@ -42,5 +48,5 @@ func main() {
 			}
 		}
 	}
-	app.Run(ctx, logger, shareVolume)
+	app.Run(ctx, logger, mgr, shareVolume)
 }