Code comments, context cancel func in callback func, func as type

ctrlc/ctrlc.go

@@ -19,7 +19,9 @@ type Iface interface {
 	Shutdown(ctx context.Context) error
 }
 
-func App(t time.Duration, f func(ctx context.Context) *[]Iface) {
+type CallbackFunc func(ctx context.Context, cancel context.CancelFunc) *[]Iface
+
+func App(t time.Duration, f CallbackFunc) {
 	stop := make(chan os.Signal)
 	signal.Notify(stop, syscall.SIGTERM)
 	signal.Notify(stop, syscall.SIGINT)
@@ -35,7 +37,7 @@ func App(t time.Duration, f func(ctx context.Context) *[]Iface) {
 	)
 
 	sctx, shutdown := context.WithCancel(context.Background())
-	ifaces := f(sctx)
+	ifaces := f(sctx, shutdown)
 
 	switch val := <-stop; val {
 	case syscall.SIGINT:

main.go

@@ -10,8 +10,9 @@ import (
 )
 
 func main() {
-	ctrlc.App(8*time.Second, func(ctx context.Context) *[]ctrlc.Iface {
+	AppFunc := func(ctx context.Context, cancel context.CancelFunc) *[]ctrlc.Iface {
 		// Some custom logic
+		// With goroutine inside
 		test := Run()
 
 		// Http web server
@@ -32,6 +33,7 @@ func main() {
 					return
 				default:
 					// Main some logic
+					// Some very long logic, just for example
 					time.Sleep(1 * time.Millisecond)
 				}
 			}
@@ -53,5 +55,8 @@ func main() {
 		}()
 
 		return &[]ctrlc.Iface{test, srv}
-	})
+	}
+
+	// Run application
+	ctrlc.App(8*time.Second, AppFunc)
 }