SchedulerEntryID option for registered scheduled job

client.go

@@ -49,6 +49,7 @@ const (
 	TaskIDOpt
 	RetentionOpt
 	GroupOpt
+	SchedulerEntryIDOpt
 )
 
 // Option specifies the task processing behavior.
@@ -65,16 +66,17 @@ type Option interface {
 
 // Internal option representations.
 type (
-	retryOption     int
-	queueOption     string
-	taskIDOption    string
-	timeoutOption   time.Duration
-	deadlineOption  time.Time
-	uniqueOption    time.Duration
-	processAtOption time.Time
-	processInOption time.Duration
-	retentionOption time.Duration
-	groupOption     string
+	retryOption            int
+	queueOption            string
+	taskIDOption           string
+	timeoutOption          time.Duration
+	deadlineOption         time.Time
+	uniqueOption           time.Duration
+	processAtOption        time.Time
+	processInOption        time.Duration
+	retentionOption        time.Duration
+	groupOption            string
+	schedulerEntryIDOption string
 )
 
 // MaxRetry returns an option to specify the max number of times
@@ -150,9 +152,9 @@ func (t deadlineOption) Value() interface{} { return time.Time(t) }
 // TTL duration must be greater than or equal to 1 second.
 //
 // Uniqueness of a task is based on the following properties:
-//     - Task Type
-//     - Task Payload
-//     - Queue Name
+//   - Task Type
+//   - Task Payload
+//   - Queue Name
 func Unique(ttl time.Duration) Option {
 	return uniqueOption(ttl)
 }
@@ -206,6 +208,18 @@ func (name groupOption) String() string     { return fmt.Sprintf("Group(%q)", st
 func (name groupOption) Type() OptionType   { return GroupOpt }
 func (name groupOption) Value() interface{} { return string(name) }
 
+// SchedulerEntryIDOpt returns an option to specify the scheduler entry ID.
+// This option is only applicable to registered scheduled jobs.
+func SchedulerEntryID(id string) Option {
+	return schedulerEntryIDOption(id)
+}
+
+func (id schedulerEntryIDOption) String() string {
+	return fmt.Sprintf("SchedulerEntryID(%q)", string(id))
+}
+func (id schedulerEntryIDOption) Type() OptionType   { return SchedulerEntryIDOpt }
+func (id schedulerEntryIDOption) Value() interface{} { return string(id) }
+
 // ErrDuplicateTask indicates that the given task could not be enqueued since it's a duplicate of another task.
 //
 // ErrDuplicateTask error only applies to tasks enqueued with a Unique option.

scheduler.go

@@ -125,7 +125,7 @@ type SchedulerOpts struct {
 
 // enqueueJob encapsulates the job of enqueuing a task and recording the event.
 type enqueueJob struct {
-	id              uuid.UUID
+	id              string
 	cronspec        string
 	task            *Task
 	opts            []Option
@@ -157,7 +157,7 @@ func (j *enqueueJob) Run() {
 		TaskID:     info.ID,
 		EnqueuedAt: time.Now().In(j.location),
 	}
-	err = j.rdb.RecordSchedulerEnqueueEvent(j.id.String(), event)
+	err = j.rdb.RecordSchedulerEnqueueEvent(j.id, event)
 	if err != nil {
 		j.logger.Warnf("scheduler could not record enqueue event of enqueued task %s: %v", info.ID, err)
 	}
@@ -166,8 +166,9 @@ func (j *enqueueJob) Run() {
 // Register registers a task to be enqueued on the given schedule specified by the cronspec.
 // It returns an ID of the newly registered entry.
 func (s *Scheduler) Register(cronspec string, task *Task, opts ...Option) (entryID string, err error) {
+
 	job := &enqueueJob{
-		id:              uuid.New(),
+		id:              generateEntryID(opts...),
 		cronspec:        cronspec,
 		task:            task,
 		opts:            opts,
@@ -184,9 +185,27 @@ func (s *Scheduler) Register(cronspec string, task *Task, opts ...Option) (entry
 		return "", err
 	}
 	s.mu.Lock()
-	s.idmap[job.id.String()] = cronID
+	s.idmap[job.id] = cronID
 	s.mu.Unlock()
-	return job.id.String(), nil
+	return job.id, nil
+}
+
+func generateEntryID(opts ...Option) string {
+	var id string
+
+	if opts != nil {
+		for _, v := range opts {
+			if v.Type() == SchedulerEntryIDOpt {
+				id = v.Value().(string)
+			}
+		}
+	}
+
+	if id == "" {
+		id = uuid.New().String()
+	}
+
+	return id
 }
 
 // Unregister removes a registered entry by entry ID.
@@ -288,7 +307,7 @@ func (s *Scheduler) beat() {
 	for _, entry := range s.cron.Entries() {
 		job := entry.Job.(*enqueueJob)
 		e := &base.SchedulerEntry{
-			ID:      job.id.String(),
+			ID:      job.id,
 			Spec:    job.cronspec,
 			Type:    job.task.Type(),
 			Payload: job.task.Payload(),
@@ -315,8 +334,8 @@ func stringifyOptions(opts []Option) []string {
 func (s *Scheduler) clearHistory() {
 	for _, entry := range s.cron.Entries() {
 		job := entry.Job.(*enqueueJob)
-		if err := s.rdb.ClearSchedulerHistory(job.id.String()); err != nil {
-			s.logger.Warnf("Could not clear scheduler history for entry %q: %v", job.id.String(), err)
+		if err := s.rdb.ClearSchedulerHistory(job.id); err != nil {
+			s.logger.Warnf("Could not clear scheduler history for entry %q: %v", job.id, err)
 		}
 	}
 }

scheduler_test.go

@@ -208,3 +208,70 @@ func TestSchedulerPostAndPreEnqueueHandler(t *testing.T) {
 	}
 	postMu.Unlock()
 }
+
+func TestSchedulerWithCustomEntryIDGeneratorFunc(t *testing.T) {
+	tests := []struct {
+		cronspec string
+		task     *Task
+		opts     []Option
+		wait     time.Duration
+		queue    string
+		want     []*base.TaskMessage
+	}{
+		{
+			cronspec: "@every 3s",
+			task:     NewTask("task1", nil),
+			opts: []Option{MaxRetry(10),
+				SchedulerEntryID("entry1"),
+			},
+			wait:  10 * time.Second,
+			queue: "default",
+			want: []*base.TaskMessage{
+				{
+					Type:    "task1",
+					Payload: nil,
+					Retry:   10,
+					Timeout: int64(defaultTimeout.Seconds()),
+					Queue:   "default",
+					ID:      "entry1",
+				},
+				{
+					Type:    "task1",
+					Payload: nil,
+					Retry:   10,
+					Timeout: int64(defaultTimeout.Seconds()),
+					Queue:   "default",
+					ID:      "entry1",
+				},
+				{
+					Type:    "task1",
+					Payload: nil,
+					Retry:   10,
+					Timeout: int64(defaultTimeout.Seconds()),
+					Queue:   "default",
+					ID:      "entry1",
+				},
+			},
+		},
+	}
+
+	r := setup(t)
+
+	for _, tc := range tests {
+		scheduler := NewScheduler(getRedisConnOpt(t), nil)
+		if _, err := scheduler.Register(tc.cronspec, tc.task, tc.opts...); err != nil {
+			t.Fatal(err)
+		}
+
+		if err := scheduler.Start(); err != nil {
+			t.Fatal(err)
+		}
+		time.Sleep(tc.wait)
+		scheduler.Shutdown()
+
+		got := testutil.GetPendingMessages(t, r, tc.queue)
+		if diff := cmp.Diff(tc.want, got, testutil.IgnoreIDOpt); diff != "" {
+			t.Errorf("mismatch found in queue %q: (-want,+got)\n%s", tc.queue, diff)
+		}
+	}
+}