fix: goroutine leak for tasker (#38)

Signed-off-by: rfyiamcool <[email protected]>

Author: rfyiamcool

Diff for: pkg/tasker/tasker.go

@@ -95,7 +95,17 @@ func New(opt Option) *Tasker {
 		logger = log.New(file, "", log.LstdFlags)
 	}
 
-	return &Tasker{Log: logger, loc: loc, gron: gron, exprs: exprs, tasks: tasks, verbose: opt.Verbose}
+	ctx, cancel := context.WithCancel(context.Background())
+	return &Tasker{
+		Log:       logger,
+		loc:       loc,
+		gron:      gron,
+		exprs:     exprs,
+		tasks:     tasks,
+		verbose:   opt.Verbose,
+		ctx:       ctx,
+		ctxCancel: cancel,
+	}
 }
 
 // WithContext adds a parent context to the Tasker struct
@@ -105,14 +115,6 @@ func (t *Tasker) WithContext(ctx context.Context) *Tasker {
 	return t
 }
 
-func (t *Tasker) ctxDone() {
-	<-t.ctx.Done()
-	if t.verbose {
-		t.Log.Printf("[tasker] received signal on context.Done, aborting")
-	}
-	t.abort = true
-}
-
 // Taskify creates TaskFunc out of plain command wrt given options.
 func (t *Tasker) Taskify(cmd string, opt Option) TaskFunc {
 	sh := Shell(opt.Shell)
@@ -259,6 +261,11 @@ func (t *Tasker) Run() {
 
 // Stop the task manager.
 func (t *Tasker) Stop() {
+	t.stop()
+}
+
+func (t *Tasker) stop() {
+	t.ctxCancel()
 	t.abort = true
 }
 
@@ -282,16 +289,20 @@ func (t *Tasker) doSetup() {
 			break
 		}
 	}
-	if t.ctx != nil {
-		go t.ctxDone()
-	}
 
 	sig := make(chan os.Signal, 1)
 	signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
 
 	go func() {
-		<-sig
-		t.abort = true
+		select {
+		case <-sig:
+		case <-t.ctx.Done():
+			if t.verbose {
+				t.Log.Printf("[tasker] received signal on context.Done, aborting")
+			}
+		}
+
+		t.stop()
 	}()
 }
 

Diff for: pkg/tasker/tasker_test.go

@@ -202,7 +202,7 @@ func TestConcurrency(t *testing.T) {
 }
 
 func TestStopTasker(t *testing.T) {
-	t.Run("Run", func(t *testing.T) {
+	t.Run("call stop()", func(t *testing.T) {
 		taskr := New(Option{Verbose: true, Out: "../../test/tasker.out"})
 
 		var incr int
@@ -216,7 +216,27 @@ func TestStopTasker(t *testing.T) {
 			taskr.Stop()
 		}()
 		taskr.Run()
-		fmt.Println(incr)
+
+		if incr != 1 {
+			t.Errorf("the task should run 1x, not %dx", incr)
+		}
+	})
+
+	t.Run("cancel context", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		taskr := New(Option{Verbose: true, Out: "../../test/tasker.out"}).WithContext(ctx)
+
+		var incr int
+		taskr.Task("* * * * * *", func(ctx context.Context) (int, error) {
+			incr++
+			return 0, nil
+		}, false)
+
+		go func() {
+			time.Sleep(2 * time.Second)
+			cancel()
+		}()
+		taskr.Run()
 
 		if incr != 1 {
 			t.Errorf("the task should run 1x, not %dx", incr)