Add Queue option to allow user to specify queue from client

Added base.QueueKey method to get redis key for given queue name.
Changed asynqtest.GetEnqueuedMessages to optionally take queue name.

client.go

@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"strings"
 	"time"
 
 	"github.com/go-redis/redis/v7"
@@ -32,8 +33,11 @@ func NewClient(r *redis.Client) *Client {
 // Option specifies the processing behavior for the associated task.
 type Option interface{}
 
-// max number of times a task will be retried.
-type retryOption int
+// Internal option representations.
+type (
+	retryOption int
+	queueOption string
+)
 
 // MaxRetry returns an option to specify the max number of times
 // a task will be retried.
@@ -46,18 +50,29 @@ func MaxRetry(n int) Option {
 	return retryOption(n)
 }
 
+// Queue returns an option to specify which queue to enqueue this task into.
+//
+// Queue name is case-insensitive and the lowercased version is used.
+func Queue(qname string) Option {
+	return queueOption(strings.ToLower(qname))
+}
+
 type option struct {
 	retry int
+	queue string
 }
 
 func composeOptions(opts ...Option) option {
 	res := option{
 		retry: defaultMaxRetry,
+		queue: base.DefaultQueueName,
 	}
 	for _, opt := range opts {
 		switch opt := opt.(type) {
 		case retryOption:
 			res.retry = int(opt)
+		case queueOption:
+			res.queue = string(opt)
 		default:
 			// ignore unexpected option
 		}
@@ -83,7 +98,7 @@ func (c *Client) Schedule(task *Task, processAt time.Time, opts ...Option) error
 		ID:      xid.New(),
 		Type:    task.Type,
 		Payload: task.Payload.data,
-		Queue:   "default",
+		Queue:   opt.queue,
 		Retry:   opt.retry,
 	}
 	return c.enqueue(msg, processAt)

client_test.go

@@ -24,7 +24,7 @@ func TestClient(t *testing.T) {
 		task          *Task
 		processAt     time.Time
 		opts          []Option
-		wantEnqueued  []*base.TaskMessage
+		wantEnqueued  map[string][]*base.TaskMessage
 		wantScheduled []h.ZSetEntry
 	}{
 		{
@@ -32,7 +32,8 @@ func TestClient(t *testing.T) {
 			task:      task,
 			processAt: time.Now(),
 			opts:      []Option{},
-			wantEnqueued: []*base.TaskMessage{
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
 					&base.TaskMessage{
 						Type:    task.Type,
 						Payload: task.Payload.data,
@@ -40,6 +41,7 @@ func TestClient(t *testing.T) {
 						Queue:   "default",
 					},
 				},
+			},
 			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
 		},
 		{
@@ -67,7 +69,8 @@ func TestClient(t *testing.T) {
 			opts: []Option{
 				MaxRetry(3),
 			},
-			wantEnqueued: []*base.TaskMessage{
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
 					&base.TaskMessage{
 						Type:    task.Type,
 						Payload: task.Payload.data,
@@ -75,6 +78,7 @@ func TestClient(t *testing.T) {
 						Queue:   "default",
 					},
 				},
+			},
 			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
 		},
 		{
@@ -84,7 +88,8 @@ func TestClient(t *testing.T) {
 			opts: []Option{
 				MaxRetry(-2),
 			},
-			wantEnqueued: []*base.TaskMessage{
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
 					&base.TaskMessage{
 						Type:    task.Type,
 						Payload: task.Payload.data,
@@ -92,6 +97,7 @@ func TestClient(t *testing.T) {
 						Queue:   "default",
 					},
 				},
+			},
 			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
 		},
 		{
@@ -102,7 +108,8 @@ func TestClient(t *testing.T) {
 				MaxRetry(2),
 				MaxRetry(10),
 			},
-			wantEnqueued: []*base.TaskMessage{
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
 					&base.TaskMessage{
 						Type:    task.Type,
 						Payload: task.Payload.data,
@@ -110,6 +117,45 @@ func TestClient(t *testing.T) {
 						Queue:   "default",
 					},
 				},
+			},
+			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
+		},
+		{
+			desc:      "With queue option",
+			task:      task,
+			processAt: time.Now(),
+			opts: []Option{
+				Queue("custom"),
+			},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"custom": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:    task.Type,
+						Payload: task.Payload.data,
+						Retry:   defaultMaxRetry,
+						Queue:   "custom",
+					},
+				},
+			},
+			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
+		},
+		{
+			desc:      "Queue option should be case-insensitive",
+			task:      task,
+			processAt: time.Now(),
+			opts: []Option{
+				Queue("HIGH"),
+			},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"high": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:    task.Type,
+						Payload: task.Payload.data,
+						Retry:   defaultMaxRetry,
+						Queue:   "high",
+					},
+				},
+			},
 			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
 		},
 	}
@@ -123,9 +169,11 @@ func TestClient(t *testing.T) {
 			continue
 		}
 
-		gotEnqueued := h.GetEnqueuedMessages(t, r)
-		if diff := cmp.Diff(tc.wantEnqueued, gotEnqueued, h.IgnoreIDOpt); diff != "" {
-			t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.DefaultQueue, diff)
+		for qname, want := range tc.wantEnqueued {
+			gotEnqueued := h.GetEnqueuedMessages(t, r, qname)
+			if diff := cmp.Diff(want, gotEnqueued, h.IgnoreIDOpt); diff != "" {
+				t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.QueueKey(qname), diff)
+			}
 		}
 
 		gotScheduled := h.GetScheduledEntries(t, r)

internal/asynqtest/asynqtest.go

@@ -156,10 +156,16 @@ func seedRedisZSet(tb testing.TB, c *redis.Client, key string, items []ZSetEntry
 	}
 }
 
-// GetEnqueuedMessages returns all task messages in the default queue.
-func GetEnqueuedMessages(tb testing.TB, r *redis.Client) []*base.TaskMessage {
+// GetEnqueuedMessages returns all task messages in the specified queue.
+//
+// If queue name option is not passed, it defaults to the default queue.
+func GetEnqueuedMessages(tb testing.TB, r *redis.Client, queueOpt ...string) []*base.TaskMessage {
 	tb.Helper()
-	return getListMessages(tb, r, base.DefaultQueue)
+	queue := base.DefaultQueue
+	if len(queueOpt) > 0 {
+		queue = base.QueueKey(queueOpt[0])
+	}
+	return getListMessages(tb, r, queue)
 }
 
 // GetInProgressMessages returns all task messages in the in-progress queue.

internal/base/base.go

@@ -11,18 +11,26 @@ import (
 	"github.com/rs/xid"
 )
 
+// DefaultQueueName is the queue name used if none are specified by user.
+const DefaultQueueName = "default"
+
 // Redis keys
 const (
 	processedPrefix = "asynq:processed:"             // STRING - asynq:processed:<yyyy-mm-dd>
 	failurePrefix   = "asynq:failure:"               // STRING - asynq:failure:<yyyy-mm-dd>
-	QueuePrefix     = "asynq:queues:"         // LIST   - asynq:queues:<qname>
-	DefaultQueue    = QueuePrefix + "default" // LIST
+	queuePrefix     = "asynq:queues:"                // LIST   - asynq:queues:<qname>
+	DefaultQueue    = queuePrefix + DefaultQueueName // LIST
 	ScheduledQueue  = "asynq:scheduled"              // ZSET
 	RetryQueue      = "asynq:retry"                  // ZSET
 	DeadQueue       = "asynq:dead"                   // ZSET
 	InProgressQueue = "asynq:in_progress"            // LIST
 )
 
+// QueueKey returns a redis key string for the given queue name.
+func QueueKey(qname string) string {
+	return queuePrefix + qname
+}
+
 // ProcessedKey returns a redis key string for procesed count
 // for the given day.
 func ProcessedKey(t time.Time) string {

internal/base/base_test.go

@@ -9,6 +9,22 @@ import (
 	"time"
 )
 
+func TestQueueKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{"custom", "asynq:queues:custom"},
+	}
+
+	for _, tc := range tests {
+		got := QueueKey(tc.qname)
+		if got != tc.want {
+			t.Errorf("QueueKey(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
 func TestProcessedKey(t *testing.T) {
 	tests := []struct {
 		input time.Time

internal/rdb/rdb.go

@@ -46,7 +46,7 @@ func (r *RDB) Enqueue(msg *base.TaskMessage) error {
 	if err != nil {
 		return err
 	}
-	qname := base.QueuePrefix + msg.Queue
+	qname := base.QueueKey(msg.Queue)
 	return r.client.LPush(qname, string(bytes)).Err()
 }