feat(worker): support disable consumer (#12)

nats.go

@@ -49,6 +49,9 @@ func NewWorker(opts ...Option) *Worker {
 }
 
 func (w *Worker) startConsumer() error {
+	if w.opts.disableConsumer {
+		return nil
+	}
 	var err error
 	w.subscription, err = w.client.QueueSubscribe(w.opts.subj, w.opts.queue, func(msg *nats.Msg) {
 		select {

nats_test.go

@@ -364,10 +364,6 @@ func TestReQueueTaskInWorkerBeforeShutdown(t *testing.T) {
 		WithAddr(host+":4222"),
 		WithSubj("test02"),
 		WithQueue("test02"),
-		WithRunFunc(func(ctx context.Context, m queue.QueuedMessage) error {
-			log.Println(string(m.Bytes()))
-			return nil
-		}),
 	)
 
 	assert.NoError(t, w.Queue(job))
@@ -377,3 +373,23 @@ func TestReQueueTaskInWorkerBeforeShutdown(t *testing.T) {
 	// see "re-queue the old job" message
 	assert.NoError(t, w.Shutdown())
 }
+
+func TestWithDisableConsumer(t *testing.T) {
+	job := queue.Job{
+		Payload: []byte("foo"),
+	}
+	w := NewWorker(
+		WithAddr(host+":4222"),
+		WithSubj("test02"),
+		WithQueue("test02"),
+		WithDisableConsumer(),
+	)
+
+	assert.NoError(t, w.Queue(job))
+	assert.NoError(t, w.Queue(job))
+	assert.NoError(t, w.Queue(job))
+	time.Sleep(100 * time.Millisecond)
+	assert.Equal(t, 0, len(w.tasks))
+	// see "re-queue the old job" message
+	assert.NoError(t, w.Shutdown())
+}

options.go

@@ -10,11 +10,12 @@ import (
 type Option func(*options)
 
 type options struct {
-	runFunc func(context.Context, queue.QueuedMessage) error
-	logger  queue.Logger
-	addr    string
-	subj    string
-	queue   string
+	runFunc         func(context.Context, queue.QueuedMessage) error
+	logger          queue.Logger
+	addr            string
+	subj            string
+	queue           string
+	disableConsumer bool
 }
 
 // WithAddr setup the addr of NATS
@@ -52,6 +53,13 @@ func WithLogger(l queue.Logger) Option {
 	}
 }
 
+// WithDisableConsumer disable consumer
+func WithDisableConsumer() Option {
+	return func(w *options) {
+		w.disableConsumer = true
+	}
+}
+
 func newOptions(opts ...Option) options {
 	defaultOpts := options{
 		addr:   "127.0.0.1:4222",