Add task message to deadlines set on dequeue

Updated dequeueCmd to decode the message and compute its deadline and add
the message to the Deadline set.

internal/asynqtest/asynqtest.go

@@ -259,6 +259,12 @@ func GetDeadEntries(tb testing.TB, r *redis.Client) []ZSetEntry {
 	return getZSetEntries(tb, r, base.DeadQueue)
 }
 
+// GetDeadlinesEntries returns all task messages and its score in the deadlines set.
+func GetDeadlinesEntries(tb testing.TB, r *redis.Client) []ZSetEntry {
+	tb.Helper()
+	return getZSetEntries(tb, r, base.KeyDeadlines)
+}
+
 func getListMessages(tb testing.TB, r *redis.Client, list string) []*base.TaskMessage {
 	data := r.LRange(list, 0, -1).Val()
 	return MustUnmarshalSlice(tb, data)

internal/rdb/rdb.go

@@ -122,15 +122,34 @@ func (r *RDB) Dequeue(qnames ...string) (*base.TaskMessage, error) {
 
 // KEYS[1]  -> asynq:in_progress
 // KEYS[2]  -> asynq:paused
-// ARGV    -> List of queues to query in order
+// KEYS[3]  -> asynq:deadlines
+// ARGV[1]  -> current time in Unix time
+// ARGV[2:] -> List of queues to query in order
 //
 // dequeueCmd checks whether a queue is paused first, before
 // calling RPOPLPUSH to pop a task from the queue.
+// It computes the task deadline by inspecting Timout and Deadline fields,
+// and inserts the task with deadlines set.
 var dequeueCmd = redis.NewScript(`
-for _, qkey in ipairs(ARGV) do
+for i = 2, table.getn(ARGV) do
+	local qkey = ARGV[i]
 	if redis.call("SISMEMBER", KEYS[2], qkey) == 0 then
 		local res = redis.call("RPOPLPUSH", qkey, KEYS[1])
 		if res then
+			local decoded = cjson.decode(res)
+			local timeout = decoded["Timeout"]
+			local deadline = decoded["Deadline"]
+			local score
+			if timeout ~= 0 and deadline ~= 0 then
+				score = math.min(ARGV[1]+timeout, deadline)
+			elseif timeout ~= 0 then
+				score = ARGV[1] + timeout
+			elseif deadline ~= 0 then
+			    score = deadline
+			else
+				return redis.error_reply("asynq internal error: both timeout and deadline are not set")
+			end
+			redis.call("ZADD", KEYS[3], score, res)
 			return res
 		end
 	end
@@ -138,8 +157,11 @@ end
 return nil`)
 
 func (r *RDB) dequeue(qkeys ...interface{}) (data string, err error) {
+	var args []interface{}
+	args = append(args, time.Now().Unix())
+	args = append(args, qkeys...)
 	res, err := dequeueCmd.Run(r.client,
-		[]string{base.InProgressQueue, base.PausedQueues}, qkeys...).Result()
+		[]string{base.InProgressQueue, base.PausedQueues, base.KeyDeadlines}, args...).Result()
 	if err != nil {
 		return "", err
 	}

internal/rdb/rdb_test.go

@@ -114,9 +114,31 @@ func TestEnqueueUnique(t *testing.T) {
 
 func TestDequeue(t *testing.T) {
 	r := setup(t)
-	t1 := h.NewTaskMessage("send_email", map[string]interface{}{"subject": "hello!"})
-	t2 := h.NewTaskMessage("export_csv", nil)
-	t3 := h.NewTaskMessage("reindex", nil)
+	now := time.Now()
+	t1 := &base.TaskMessage{
+		ID:       xid.New(),
+		Type:     "send_email",
+		Payload:  map[string]interface{}{"subject": "hello!"},
+		Timeout:  1800,
+		Deadline: 0,
+	}
+	t1Deadline := int(now.Unix()) + t1.Timeout
+	t2 := &base.TaskMessage{
+		ID:       xid.New(),
+		Type:     "export_csv",
+		Payload:  nil,
+		Timeout:  0,
+		Deadline: 1593021600,
+	}
+	t2Deadline := t2.Deadline
+	t3 := &base.TaskMessage{
+		ID:       xid.New(),
+		Type:     "reindex",
+		Payload:  nil,
+		Timeout:  int((5 * time.Minute).Seconds()),
+		Deadline: int(time.Now().Add(10 * time.Minute).Unix()),
+	}
+	t3Deadline := int(now.Unix()) + t3.Timeout // use whichever is earliest
 
 	tests := []struct {
 		enqueued       map[string][]*base.TaskMessage
@@ -125,6 +147,7 @@ func TestDequeue(t *testing.T) {
 		err            error
 		wantEnqueued   map[string][]*base.TaskMessage
 		wantInProgress []*base.TaskMessage
+		wantDeadlines  []h.ZSetEntry
 	}{
 		{
 			enqueued: map[string][]*base.TaskMessage{
@@ -137,6 +160,12 @@ func TestDequeue(t *testing.T) {
 				"default": {},
 			},
 			wantInProgress: []*base.TaskMessage{t1},
+			wantDeadlines: []h.ZSetEntry{
+				{
+					Msg:   t1,
+					Score: float64(t1Deadline),
+				},
+			},
 		},
 		{
 			enqueued: map[string][]*base.TaskMessage{
@@ -149,6 +178,7 @@ func TestDequeue(t *testing.T) {
 				"default": {},
 			},
 			wantInProgress: []*base.TaskMessage{},
+			wantDeadlines:  []h.ZSetEntry{},
 		},
 		{
 			enqueued: map[string][]*base.TaskMessage{
@@ -165,22 +195,34 @@ func TestDequeue(t *testing.T) {
 				"low":      {t3},
 			},
 			wantInProgress: []*base.TaskMessage{t2},
+			wantDeadlines: []h.ZSetEntry{
+				{
+					Msg:   t2,
+					Score: float64(t2Deadline),
+				},
+			},
 		},
 		{
 			enqueued: map[string][]*base.TaskMessage{
-				"default":  {t1},
+				"default":  {t3},
 				"critical": {},
-				"low":      {t2, t3},
+				"low":      {t2, t1},
 			},
 			args: []string{"critical", "default", "low"},
-			want: t1,
+			want: t3,
 			err:  nil,
 			wantEnqueued: map[string][]*base.TaskMessage{
 				"default":  {},
 				"critical": {},
-				"low":      {t2, t3},
+				"low":      {t2, t1},
+			},
+			wantInProgress: []*base.TaskMessage{t3},
+			wantDeadlines: []h.ZSetEntry{
+				{
+					Msg:   t3,
+					Score: float64(t3Deadline),
+				},
 			},
-			wantInProgress: []*base.TaskMessage{t1},
 		},
 		{
 			enqueued: map[string][]*base.TaskMessage{
@@ -197,6 +239,7 @@ func TestDequeue(t *testing.T) {
 				"low":      {},
 			},
 			wantInProgress: []*base.TaskMessage{},
+			wantDeadlines:  []h.ZSetEntry{},
 		},
 	}
 
@@ -224,6 +267,11 @@ func TestDequeue(t *testing.T) {
 		if diff := cmp.Diff(tc.wantInProgress, gotInProgress, h.SortMsgOpt); diff != "" {
 			t.Errorf("mismatch found in %q: (-want,+got):\n%s", base.InProgressQueue, diff)
 		}
+
+		gotDeadlines := h.GetDeadlinesEntries(t, r.client)
+		if diff := cmp.Diff(tc.wantDeadlines, gotDeadlines, h.SortZSetEntryOpt); diff != "" {
+			t.Errorf("mismatch found in %q: (-want,+got):\n%s", base.KeyDeadlines, diff)
+		}
 	}
 }