Add Deadline option when enqueuing tasks

Deadline option sets the deadline for the given task's context deadline.

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- `Client` can optionally schedule task with `asynq.Deadline(time)` to specify deadline for task's context. Default is no deadline.
+
 ## [0.6.0] - 2020-03-01
 
 ### Added

client.go

@@ -37,6 +37,7 @@ type (
 	retryOption    int
 	queueOption    string
 	timeoutOption  time.Duration
+	deadlineOption time.Time
 )
 
 // MaxRetry returns an option to specify the max number of times
@@ -64,10 +65,16 @@ func Timeout(d time.Duration) Option {
 	return timeoutOption(d)
 }
 
+// Deadline returns an option to specify the deadline for the given task.
+func Deadline(t time.Time) Option {
+	return deadlineOption(t)
+}
+
 type option struct {
 	retry    int
 	queue    string
 	timeout  time.Duration
+	deadline time.Time
 }
 
 func composeOptions(opts ...Option) option {
@@ -75,6 +82,7 @@ func composeOptions(opts ...Option) option {
 		retry:    defaultMaxRetry,
 		queue:    base.DefaultQueueName,
 		timeout:  0,
+		deadline: time.Time{},
 	}
 	for _, opt := range opts {
 		switch opt := opt.(type) {
@@ -84,6 +92,8 @@ func composeOptions(opts ...Option) option {
 			res.queue = string(opt)
 		case timeoutOption:
 			res.timeout = time.Duration(opt)
+		case deadlineOption:
+			res.deadline = time.Time(opt)
 		default:
 			// ignore unexpected option
 		}
@@ -111,6 +121,7 @@ func (c *Client) EnqueueAt(t time.Time, task *Task, opts ...Option) error {
 		Queue:    opt.queue,
 		Retry:    opt.retry,
 		Timeout:  opt.timeout.String(),
+		Deadline: opt.deadline.Format(time.RFC3339),
 	}
 	return c.enqueue(msg, t)
 }

client_test.go

@@ -25,6 +25,9 @@ func TestClientEnqueueAt(t *testing.T) {
 	var (
 		now          = time.Now()
 		oneHourLater = now.Add(time.Hour)
+
+		noTimeout  = time.Duration(0).String()
+		noDeadline = time.Time{}.Format(time.RFC3339)
 	)
 
 	tests := []struct {
@@ -47,7 +50,8 @@ func TestClientEnqueueAt(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    defaultMaxRetry,
 						Queue:    "default",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},
@@ -66,7 +70,8 @@ func TestClientEnqueueAt(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    defaultMaxRetry,
 						Queue:    "default",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 					Score: float64(oneHourLater.Unix()),
 				},
@@ -106,6 +111,11 @@ func TestClientEnqueue(t *testing.T) {
 
 	task := NewTask("send_email", map[string]interface{}{"to": "customer@gmail.com", "from": "merchant@example.com"})
 
+	var (
+		noTimeout  = time.Duration(0).String()
+		noDeadline = time.Time{}.Format(time.RFC3339)
+	)
+
 	tests := []struct {
 		desc         string
 		task         *Task
@@ -125,7 +135,8 @@ func TestClientEnqueue(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    3,
 						Queue:    "default",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},
@@ -143,7 +154,8 @@ func TestClientEnqueue(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    0, // Retry count should be set to zero
 						Queue:    "default",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},
@@ -162,7 +174,8 @@ func TestClientEnqueue(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    10, // Last option takes precedence
 						Queue:    "default",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},
@@ -180,7 +193,8 @@ func TestClientEnqueue(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    defaultMaxRetry,
 						Queue:    "custom",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},
@@ -198,13 +212,14 @@ func TestClientEnqueue(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    defaultMaxRetry,
 						Queue:    "high",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},
 		},
 		{
-			desc: "Timeout option sets the timeout duration",
+			desc: "With timeout option",
 			task: task,
 			opts: []Option{
 				Timeout(20 * time.Second),
@@ -217,6 +232,26 @@ func TestClientEnqueue(t *testing.T) {
 						Retry:    defaultMaxRetry,
 						Queue:    "default",
 						Timeout:  (20 * time.Second).String(),
+						Deadline: noDeadline,
+					},
+				},
+			},
+		},
+		{
+			desc: "With deadline option",
+			task: task,
+			opts: []Option{
+				Deadline(time.Date(2020, time.June, 24, 0, 0, 0, 0, time.UTC)),
+			},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    defaultMaxRetry,
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: time.Date(2020, time.June, 24, 0, 0, 0, 0, time.UTC).Format(time.RFC3339),
 					},
 				},
 			},
@@ -250,6 +285,11 @@ func TestClientEnqueueIn(t *testing.T) {
 
 	task := NewTask("send_email", map[string]interface{}{"to": "customer@gmail.com", "from": "merchant@example.com"})
 
+	var (
+		noTimeout  = time.Duration(0).String()
+		noDeadline = time.Time{}.Format(time.RFC3339)
+	)
+
 	tests := []struct {
 		desc          string
 		task          *Task
@@ -271,7 +311,8 @@ func TestClientEnqueueIn(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    defaultMaxRetry,
 						Queue:    "default",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 					Score: float64(time.Now().Add(time.Hour).Unix()),
 				},
@@ -289,7 +330,8 @@ func TestClientEnqueueIn(t *testing.T) {
 						Payload:  task.Payload.data,
 						Retry:    defaultMaxRetry,
 						Queue:    "default",
-						Timeout: time.Duration(0).String(),
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},

internal/base/base.go

@@ -90,6 +90,13 @@ type TaskMessage struct {
 	//
 	// Zero means no limit.
 	Timeout string
+
+	// Deadline specifies the deadline for the task.
+	// Task won't be processed if it exceeded its deadline.
+	// The string shoulbe be in RFC3339 format.
+	//
+	// time.Time's zero value means no deadline.
+	Deadline string
 }
 
 // ProcessState holds process level information.

processor.go

@@ -188,7 +188,7 @@ func (p *processor) exec() {
 			select {
 			case <-p.quit:
 				// time is up, quit this worker goroutine.
-				logger.warn("Quitting worker to process task id=%s", msg.ID)
+				logger.warn("Quitting worker. task id=%s", msg.ID)
 				return
 			case resErr := <-resCh:
 				// Note: One of three things should happen.
@@ -391,14 +391,18 @@ func gcd(xs ...int) int {
 }
 
 // createContext returns a context and cancel function for a given task message.
-func createContext(msg *base.TaskMessage) (context.Context, context.CancelFunc) {
+func createContext(msg *base.TaskMessage) (ctx context.Context, cancel context.CancelFunc) {
+	ctx = context.Background()
 	timeout, err := time.ParseDuration(msg.Timeout)
-	if err != nil {
+	if err == nil && timeout != 0 {
-		logger.error("cannot parse timeout duration for %+v", msg)
+		ctx, cancel = context.WithTimeout(ctx, timeout)
-		return context.WithCancel(context.Background())
 	}
-	if timeout == 0 {
+	deadline, err := time.Parse(time.RFC3339, msg.Deadline)
-		return context.WithCancel(context.Background())
+	if err == nil && !deadline.IsZero() {
+		ctx, cancel = context.WithDeadline(ctx, deadline)
 	}
-	return context.WithTimeout(context.Background(), timeout)
+	if cancel == nil {
+		ctx, cancel = context.WithCancel(ctx)
+	}
+	return ctx, cancel
 }

processor_test.go

@@ -17,6 +17,7 @@ import (
 	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/rs/xid"
 )
 
 func TestProcessorSuccess(t *testing.T) {
@@ -363,3 +364,85 @@ func TestPerform(t *testing.T) {
 		}
 	}
 }
+
+func TestCreateContextWithTimeRestrictions(t *testing.T) {
+	var (
+		noTimeout  = time.Duration(0)
+		noDeadline = time.Time{}
+	)
+
+	tests := []struct {
+		desc         string
+		timeout      time.Duration
+		deadline     time.Time
+		wantDeadline time.Time
+	}{
+		{"only with timeout", 10 * time.Second, noDeadline, time.Now().Add(10 * time.Second)},
+		{"only with deadline", noTimeout, time.Now().Add(time.Hour), time.Now().Add(time.Hour)},
+		{"with timeout and deadline (timeout < deadline)", 10 * time.Second, time.Now().Add(time.Hour), time.Now().Add(10 * time.Second)},
+		{"with timeout and deadline (timeout > deadline)", 10 * time.Minute, time.Now().Add(30 * time.Second), time.Now().Add(30 * time.Second)},
+	}
+
+	for _, tc := range tests {
+		msg := &base.TaskMessage{
+			Type:     "something",
+			ID:       xid.New(),
+			Timeout:  tc.timeout.String(),
+			Deadline: tc.deadline.Format(time.RFC3339),
+		}
+
+		ctx, cancel := createContext(msg)
+
+		select {
+		case x := <-ctx.Done():
+			t.Errorf("%s: <-ctx.Done() == %v, want nothing (it should block)", tc.desc, x)
+		default:
+		}
+
+		got, ok := ctx.Deadline()
+		if !ok {
+			t.Errorf("%s: ctx.Deadline() returned false, want deadline to be set", tc.desc)
+		}
+		if !cmp.Equal(tc.wantDeadline, got, cmpopts.EquateApproxTime(time.Second)) {
+			t.Errorf("%s: ctx.Deadline() returned %v, want %v", tc.desc, got, tc.wantDeadline)
+		}
+
+		cancel()
+
+		select {
+		case <-ctx.Done():
+		default:
+			t.Errorf("ctx.Done() blocked, want it to be non-blocking")
+		}
+	}
+}
+
+func TestCreateContextWithoutTimeRestrictions(t *testing.T) {
+	msg := &base.TaskMessage{
+		Type:     "something",
+		ID:       xid.New(),
+		Timeout:  time.Duration(0).String(),        // zero value to indicate no timeout
+		Deadline: time.Time{}.Format(time.RFC3339), // zero value to indicate no deadline
+	}
+
+	ctx, cancel := createContext(msg)
+
+	select {
+	case x := <-ctx.Done():
+		t.Errorf("<-ctx.Done() == %v, want nothing (it should block)", x)
+	default:
+	}
+
+	_, ok := ctx.Deadline()
+	if ok {
+		t.Error("ctx.Deadline() returned true, want deadline to not be set")
+	}
+
+	cancel()
+
+	select {
+	case <-ctx.Done():
+	default:
+		t.Error("ctx.Done() blocked, want it to be non-blocking")
+	}
+}