Merge a05cbd2e387186d3e12b93d939a9e6b7be8a6b5c into c327bc40a28e4db45195cfe082d88faa808ce87d

aggregator.go

@@ -81,6 +81,11 @@ func newAggregator(params aggregatorParams) *aggregator {
 	}
 }
 
+func (a *aggregator) resetState() {
+	a.done = make(chan struct{})
+	a.sema = make(chan struct{}, maxConcurrentAggregationChecks)
+}
+
 func (a *aggregator) shutdown() {
 	if a.ga == nil {
 		return

heartbeat.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/timeutil"

internal/base/base.go

@@ -14,12 +14,13 @@ import (
 	"sync"
 	"time"
 
-	"github.com/hibiken/asynq/internal/errors"
-	pb "github.com/hibiken/asynq/internal/proto"
-	"github.com/hibiken/asynq/internal/timeutil"
 	"github.com/redis/go-redis/v9"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/timestamppb"
+
+	"github.com/hibiken/asynq/internal/errors"
+	pb "github.com/hibiken/asynq/internal/proto"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
 // Version of asynq library and CLI.
@@ -722,4 +723,5 @@ type Broker interface {
 	PublishCancelation(id string) error
 
 	WriteResult(qname, id string, data []byte) (n int, err error)
+	SetQueueConcurrency(qname string, concurrency int)
 }

internal/rdb/rdb.go

@@ -13,11 +13,12 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/redis/go-redis/v9"
+	"github.com/spf13/cast"
+
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/timeutil"
-	"github.com/redis/go-redis/v9"
-	"github.com/spf13/cast"
 )
 
 const statsTTL = 90 * 24 * time.Hour // 90 days
@@ -25,19 +26,34 @@ const statsTTL = 90 * 24 * time.Hour // 90 days
 // LeaseDuration is the duration used to initially create a lease and to extend it thereafter.
 const LeaseDuration = 30 * time.Second
 
+type Option func(r *RDB)
+
+func WithQueueConcurrency(queueConcurrency map[string]int) Option {
+	return func(r *RDB) {
+		for qname, concurrency := range queueConcurrency {
+			r.queueConcurrency.Store(qname, concurrency)
+		}
+	}
+}
+
 // RDB is a client interface to query and mutate task queues.
 type RDB struct {
-	client          redis.UniversalClient
-	clock           timeutil.Clock
-	queuesPublished sync.Map
+	client           redis.UniversalClient
+	clock            timeutil.Clock
+	queuesPublished  sync.Map
+	queueConcurrency sync.Map
 }
 
 // NewRDB returns a new instance of RDB.
-func NewRDB(client redis.UniversalClient) *RDB {
-	return &RDB{
+func NewRDB(client redis.UniversalClient, opts ...Option) *RDB {
+	r := &RDB{
 		client: client,
 		clock:  timeutil.NewRealClock(),
 	}
+	for _, opt := range opts {
+		opt(r)
+	}
+	return r
 }
 
 // Close closes the connection with redis server.
@@ -217,6 +233,7 @@ func (r *RDB) EnqueueUnique(ctx context.Context, msg *base.TaskMessage, ttl time
 // --
 // ARGV[1] -> initial lease expiration Unix time
 // ARGV[2] -> task key prefix
+// ARGV[3] -> queue concurrency
 //
 // Output:
 // Returns nil if no processable task is found in the given queue.
@@ -225,15 +242,20 @@ func (r *RDB) EnqueueUnique(ctx context.Context, msg *base.TaskMessage, ttl time
 // Note: dequeueCmd checks whether a queue is paused first, before
 // calling RPOPLPUSH to pop a task from the queue.
 var dequeueCmd = redis.NewScript(`
-if redis.call("EXISTS", KEYS[2]) == 0 then
-	local id = redis.call("RPOPLPUSH", KEYS[1], KEYS[3])
-	if id then
-		local key = ARGV[2] .. id
-		redis.call("HSET", key, "state", "active")
-		redis.call("HDEL", key, "pending_since")
-		redis.call("ZADD", KEYS[4], ARGV[1], id)
-		return redis.call("HGET", key, "msg")
-	end
+if redis.call("EXISTS", KEYS[2]) > 0 then
+	return nil
+end
+local count = redis.call("ZCARD", KEYS[4])
+if (count >= tonumber(ARGV[3])) then
+     return nil
+end
+local id = redis.call("RPOPLPUSH", KEYS[1], KEYS[3])
+if id then
+	local key = ARGV[2] .. id
+	redis.call("HSET", key, "state", "active")
+	redis.call("HDEL", key, "pending_since")
+	redis.call("ZADD", KEYS[4], ARGV[1], id)
+	return redis.call("HGET", key, "msg")
 end
 return nil`)
 
@@ -251,9 +273,14 @@ func (r *RDB) Dequeue(qnames ...string) (msg *base.TaskMessage, leaseExpirationT
 			base.LeaseKey(qname),
 		}
 		leaseExpirationTime = r.clock.Now().Add(LeaseDuration)
+		queueConcurrency, ok := r.queueConcurrency.Load(qname)
+		if !ok || queueConcurrency.(int) <= 0 {
+			queueConcurrency = math.MaxInt
+		}
 		argv := []interface{}{
 			leaseExpirationTime.Unix(),
 			base.TaskKeyPrefix(qname),
+			queueConcurrency,
 		}
 		res, err := dequeueCmd.Run(context.Background(), r.client, keys, argv...).Result()
 		if err == redis.Nil {
@@ -1556,3 +1583,7 @@ func (r *RDB) WriteResult(qname, taskID string, data []byte) (int, error) {
 	}
 	return len(data), nil
 }
+
+func (r *RDB) SetQueueConcurrency(qname string, concurrency int) {
+	r.queueConcurrency.Store(qname, concurrency)
+}

internal/rdb/rdb_test.go

@@ -18,11 +18,12 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/google/uuid"
+	"github.com/redis/go-redis/v9"
+
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	h "github.com/hibiken/asynq/internal/testutil"
 	"github.com/hibiken/asynq/internal/timeutil"
-	"github.com/redis/go-redis/v9"
 )
 
 // variables used for package testing.
@@ -384,6 +385,7 @@ func TestDequeue(t *testing.T) {
 		wantPending        map[string][]*base.TaskMessage
 		wantActive         map[string][]*base.TaskMessage
 		wantLease          map[string][]base.Z
+		queueConcurrency   map[string]int
 	}{
 		{
 			pending: map[string][]*base.TaskMessage{
@@ -494,6 +496,92 @@ func TestDequeue(t *testing.T) {
 	}
 }
 
+func TestDequeueWithQueueConcurrency(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	now := time.Now()
+	r.SetClock(timeutil.NewSimulatedClock(now))
+	const taskNum = 3
+	msgs := make([]*base.TaskMessage, 0, taskNum)
+	for i := 0; i < taskNum; i++ {
+		msg := &base.TaskMessage{
+			ID:       uuid.NewString(),
+			Type:     "send_email",
+			Payload:  h.JSON(map[string]interface{}{"subject": "hello!"}),
+			Queue:    "default",
+			Timeout:  1800,
+			Deadline: 0,
+		}
+		msgs = append(msgs, msg)
+	}
+
+	tests := []struct {
+		name             string
+		pending          map[string][]*base.TaskMessage
+		qnames           []string // list of queues to query
+		queueConcurrency map[string]int
+		wantMsgs         []*base.TaskMessage
+	}{
+		{
+			name: "without queue concurrency control",
+			pending: map[string][]*base.TaskMessage{
+				"default": msgs,
+			},
+			qnames:   []string{"default"},
+			wantMsgs: msgs,
+		},
+		{
+			name: "with queue concurrency control",
+			pending: map[string][]*base.TaskMessage{
+				"default": msgs,
+			},
+			qnames:           []string{"default"},
+			queueConcurrency: map[string]int{"default": 2},
+			wantMsgs:         msgs[:2],
+		},
+		{
+			name: "with queue concurrency zero",
+			pending: map[string][]*base.TaskMessage{
+				"default": msgs,
+			},
+			qnames:           []string{"default"},
+			queueConcurrency: map[string]int{"default": 0},
+			wantMsgs:         msgs,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			h.FlushDB(t, r.client) // clean up db before each test case
+			h.SeedAllPendingQueues(t, r.client, tc.pending)
+			r.queueConcurrency.Range(func(key, value interface{}) bool {
+				r.queueConcurrency.Delete(key)
+				return true
+			})
+			for queue, n := range tc.queueConcurrency {
+				r.queueConcurrency.Store(queue, n)
+			}
+
+			gotMsgs := make([]*base.TaskMessage, 0, len(msgs))
+			for i := 0; i < len(msgs); i++ {
+				msg, _, err := r.Dequeue(tc.qnames...)
+				if errors.Is(err, errors.ErrNoProcessableTask) {
+					break
+				}
+				if err != nil {
+					t.Errorf("(*RDB).Dequeue(%v) returned error %v", tc.qnames, err)
+					continue
+				}
+				gotMsgs = append(gotMsgs, msg)
+			}
+			if diff := cmp.Diff(tc.wantMsgs, gotMsgs, h.SortZSetEntryOpt); diff != "" {
+				t.Errorf("(*RDB).Dequeue(%v) returned message %v; want %v",
+					tc.qnames, gotMsgs, tc.wantMsgs)
+			}
+		})
+	}
+}
+
 func TestDequeueError(t *testing.T) {
 	r := setup(t)
 	defer r.Close()

internal/testbroker/testbroker.go

@@ -11,8 +11,9 @@ import (
 	"sync"
 	"time"
 
-	"github.com/hibiken/asynq/internal/base"
 	"github.com/redis/go-redis/v9"
+
+	"github.com/hibiken/asynq/internal/base"
 )
 
 var errRedisDown = errors.New("testutil: redis is down")
@@ -297,3 +298,7 @@ func (tb *TestBroker) ReclaimStaleAggregationSets(qname string) error {
 	}
 	return tb.real.ReclaimStaleAggregationSets(qname)
 }
+
+func (tb *TestBroker) SetQueueConcurrency(qname string, concurrency int) {
+	tb.real.SetQueueConcurrency(qname, concurrency)
+}

processor.go

@@ -16,12 +16,13 @@ import (
 	"sync"
 	"time"
 
+	"golang.org/x/time/rate"
+
 	"github.com/hibiken/asynq/internal/base"
 	asynqcontext "github.com/hibiken/asynq/internal/context"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/timeutil"
-	"golang.org/x/time/rate"
 )
 
 type processor struct {
@@ -57,7 +58,7 @@ type processor struct {
 	// channel to communicate back to the long running "processor" goroutine.
 	// once is used to send value to the channel only once.
 	done chan struct{}
-	once sync.Once
+	once *sync.Once
 
 	// quit channel is closed when the shutdown of the "processor" goroutine starts.
 	quit chan struct{}
@@ -112,6 +113,7 @@ func newProcessor(params processorParams) *processor {
 		errLogLimiter:     rate.NewLimiter(rate.Every(3*time.Second), 1),
 		sema:              make(chan struct{}, params.concurrency),
 		done:              make(chan struct{}),
+		once:              &sync.Once{},
 		quit:              make(chan struct{}),
 		abort:             make(chan struct{}),
 		errHandler:        params.errHandler,
@@ -139,7 +141,9 @@ func (p *processor) stop() {
 func (p *processor) shutdown() {
 	p.stop()
 
-	time.AfterFunc(p.shutdownTimeout, func() { close(p.abort) })
+	go func(abort chan struct{}) {
+		time.AfterFunc(p.shutdownTimeout, func() { close(abort) })
+	}(p.abort)
 
 	p.logger.Info("Waiting for all workers to finish...")
 	// block until all workers have released the token
@@ -149,6 +153,14 @@ func (p *processor) shutdown() {
 	p.logger.Info("All workers have finished")
 }
 
+func (p *processor) resetState() {
+	p.sema = make(chan struct{}, cap(p.sema))
+	p.done = make(chan struct{})
+	p.quit = make(chan struct{})
+	p.abort = make(chan struct{})
+	p.once = &sync.Once{}
+}
+
 func (p *processor) start(wg *sync.WaitGroup) {
 	wg.Add(1)
 	go func() {

server.go

@@ -15,10 +15,11 @@ import (
 	"sync"
 	"time"
 
+	"github.com/redis/go-redis/v9"
+
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/rdb"
-	"github.com/redis/go-redis/v9"
 )
 
 // Server is responsible for task processing and task lifecycle management.
@@ -43,6 +44,10 @@ type Server struct {
 
 	state *serverState
 
+	mu             sync.RWMutex
+	queues         map[string]int
+	strictPriority bool
+
 	// wait group to wait for all goroutines to finish.
 	wg            sync.WaitGroup
 	forwarder     *forwarder
@@ -252,6 +257,11 @@ type Config struct {
 	// If unset or zero, default batch size of 100 is used.
 	// Make sure to not put a big number as the batch size to prevent a long-running script.
 	JanitorBatchSize int
+
+	// Maximum number of concurrent tasks of a queue.
+	//
+	// If set to a zero or not set, NewServer will not limit concurrency of the queue.
+	QueueConcurrency map[string]int
 }
 
 // GroupAggregator aggregates a group of tasks into one before the tasks are passed to the Handler.
@@ -474,7 +484,9 @@ func NewServerFromRedisClient(c redis.UniversalClient, cfg Config) *Server {
 		}
 	}
 	if len(queues) == 0 {
-		queues = defaultQueueConfig
+		for qname, p := range defaultQueueConfig {
+			queues[qname] = p
+		}
 	}
 	var qnames []string
 	for q := range queues {
@@ -503,7 +515,7 @@ func NewServerFromRedisClient(c redis.UniversalClient, cfg Config) *Server {
 	}
 	logger.SetLevel(toInternalLogLevel(loglevel))
 
-	rdb := rdb.NewRDB(c)
+	rdb := rdb.NewRDB(c, rdb.WithQueueConcurrency(cfg.QueueConcurrency))
 	starting := make(chan *workerInfo)
 	finished := make(chan *base.TaskMessage)
 	syncCh := make(chan *syncRequest)
@@ -603,6 +615,8 @@ func NewServerFromRedisClient(c redis.UniversalClient, cfg Config) *Server {
 		groupAggregator: cfg.GroupAggregator,
 	})
 	return &Server{
+		queues:           queues,
+		strictPriority:   cfg.StrictPriority,
 		logger:           logger,
 		broker:           rdb,
 		sharedConnection: true,
@@ -785,3 +799,79 @@ func (srv *Server) Ping() error {
 
 	return srv.broker.Ping()
 }
+
+func (srv *Server) AddQueue(qname string, priority, concurrency int) {
+	srv.mu.Lock()
+	defer srv.mu.Unlock()
+
+	if _, ok := srv.queues[qname]; ok {
+		srv.logger.Warnf("queue %s already exists, skipping", qname)
+		return
+	}
+
+	srv.state.mu.Lock()
+	state := srv.state.value
+	if state == srvStateNew || state == srvStateClosed {
+		srv.queues[qname] = priority
+		srv.state.mu.Unlock()
+		return
+	}
+	srv.state.mu.Unlock()
+
+	srv.logger.Info("restart server...")
+	srv.forwarder.shutdown()
+	srv.processor.shutdown()
+	srv.recoverer.shutdown()
+	srv.syncer.shutdown()
+	srv.subscriber.shutdown()
+	srv.janitor.shutdown()
+	srv.aggregator.shutdown()
+	srv.healthchecker.shutdown()
+	srv.heartbeater.shutdown()
+	srv.wg.Wait()
+
+	srv.queues[qname] = priority
+
+	qnames := make([]string, 0, len(srv.queues))
+	for q := range srv.queues {
+		qnames = append(qnames, q)
+	}
+	srv.broker.SetQueueConcurrency(qname, concurrency)
+	srv.heartbeater.queues = srv.queues
+	srv.recoverer.queues = qnames
+	srv.forwarder.queues = qnames
+	srv.processor.resetState()
+	queues := normalizeQueues(srv.queues)
+	orderedQueues := []string(nil)
+	if srv.strictPriority {
+		orderedQueues = sortByPriority(queues)
+	}
+	srv.processor.queueConfig = srv.queues
+	srv.processor.orderedQueues = orderedQueues
+	srv.janitor.queues = qnames
+	srv.aggregator.resetState()
+	srv.aggregator.queues = qnames
+
+	srv.heartbeater.start(&srv.wg)
+	srv.healthchecker.start(&srv.wg)
+	srv.subscriber.start(&srv.wg)
+	srv.syncer.start(&srv.wg)
+	srv.recoverer.start(&srv.wg)
+	srv.forwarder.start(&srv.wg)
+	srv.processor.start(&srv.wg)
+	srv.janitor.start(&srv.wg)
+	srv.aggregator.start(&srv.wg)
+
+	srv.logger.Info("server restarted")
+}
+
+func (srv *Server) HasQueue(qname string) bool {
+	srv.mu.RLock()
+	defer srv.mu.RUnlock()
+	_, ok := srv.queues[qname]
+	return ok
+}
+
+func (srv *Server) SetQueueConcurrency(queue string, concurrency int) {
+	srv.broker.SetQueueConcurrency(queue, concurrency)
+}

server_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
 	"github.com/hibiken/asynq/internal/testbroker"
 	"github.com/hibiken/asynq/internal/testutil"
@@ -80,6 +81,198 @@ func TestServerFromRedisClient(t *testing.T) {
 	}
 }
 
+func TestServerWithQueueConcurrency(t *testing.T) {
+	// https://github.com/go-redis/redis/issues/1029
+	ignoreOpt := goleak.IgnoreTopFunction("github.com/redis/go-redis/v9/internal/pool.(*ConnPool).reaper")
+	defer goleak.VerifyNone(t, ignoreOpt)
+
+	redisConnOpt := getRedisConnOpt(t)
+	r, ok := redisConnOpt.MakeRedisClient().(redis.UniversalClient)
+	if !ok {
+		t.Fatalf("asynq: unsupported RedisConnOpt type %T", r)
+	}
+
+	const taskNum = 8
+	const serverNum = 2
+	tests := []struct {
+		name             string
+		concurrency      int
+		queueConcurrency int
+		wantActiveNum    int
+	}{
+		{
+			name:             "based on client concurrency control",
+			concurrency:      2,
+			queueConcurrency: 6,
+			wantActiveNum:    2 * serverNum,
+		},
+		{
+			name:             "no queue concurrency control",
+			concurrency:      2,
+			queueConcurrency: 0,
+			wantActiveNum:    2 * serverNum,
+		},
+		{
+			name:             "based on queue concurrency control",
+			concurrency:      6,
+			queueConcurrency: 2,
+			wantActiveNum:    2,
+		},
+	}
+
+	// no-op handler
+	handle := func(ctx context.Context, task *Task) error {
+		time.Sleep(time.Second * 2)
+		return nil
+	}
+
+	var servers [serverNum]*Server
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			var err error
+			testutil.FlushDB(t, r)
+			c := NewClient(redisConnOpt)
+			defer c.Close()
+			for i := 0; i < taskNum; i++ {
+				_, err = c.Enqueue(NewTask("send_email",
+					testutil.JSON(map[string]interface{}{"recipient_id": i + 123})))
+				if err != nil {
+					t.Fatalf("could not enqueue a task: %v", err)
+				}
+			}
+
+			for i := 0; i < serverNum; i++ {
+				srv := NewServer(redisConnOpt, Config{
+					Concurrency:      tc.concurrency,
+					LogLevel:         testLogLevel,
+					QueueConcurrency: map[string]int{base.DefaultQueueName: tc.queueConcurrency},
+				})
+				err = srv.Start(HandlerFunc(handle))
+				if err != nil {
+					t.Fatal(err)
+				}
+				servers[i] = srv
+			}
+			defer func() {
+				for _, srv := range servers {
+					srv.Shutdown()
+				}
+			}()
+
+			time.Sleep(time.Second)
+			inspector := NewInspector(redisConnOpt)
+			tasks, err := inspector.ListActiveTasks(base.DefaultQueueName)
+			if err != nil {
+				t.Fatalf("could not list active tasks: %v", err)
+			}
+			if len(tasks) != tc.wantActiveNum {
+				t.Errorf("default queue has %d active tasks, want %d", len(tasks), tc.wantActiveNum)
+			}
+		})
+	}
+}
+
+func TestServerWithDynamicQueue(t *testing.T) {
+	// https://github.com/go-redis/redis/issues/1029
+	ignoreOpt := goleak.IgnoreTopFunction("github.com/redis/go-redis/v9/internal/pool.(*ConnPool).reaper")
+	defer goleak.VerifyNone(t, ignoreOpt)
+
+	redisConnOpt := getRedisConnOpt(t)
+	r, ok := redisConnOpt.MakeRedisClient().(redis.UniversalClient)
+	if !ok {
+		t.Fatalf("asynq: unsupported RedisConnOpt type %T", r)
+	}
+
+	const taskNum = 8
+	const serverNum = 2
+	tests := []struct {
+		name             string
+		concurrency      int
+		queueConcurrency int
+		wantActiveNum    int
+	}{
+		{
+			name:             "based on client concurrency control",
+			concurrency:      2,
+			queueConcurrency: 6,
+			wantActiveNum:    2 * serverNum,
+		},
+		{
+			name:             "no queue concurrency control",
+			concurrency:      2,
+			queueConcurrency: 0,
+			wantActiveNum:    2 * serverNum,
+		},
+		{
+			name:             "based on queue concurrency control",
+			concurrency:      6,
+			queueConcurrency: 2,
+			wantActiveNum:    2 * serverNum,
+		},
+	}
+
+	// no-op handler
+	handle := func(ctx context.Context, task *Task) error {
+		time.Sleep(time.Second * 2)
+		return nil
+	}
+
+	var DynamicQueueNameFmt = "dynamic:%d:%d"
+	var servers [serverNum]*Server
+	for tcn, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			var err error
+			testutil.FlushDB(t, r)
+			c := NewClient(redisConnOpt)
+			defer c.Close()
+			for i := 0; i < taskNum; i++ {
+				_, err = c.Enqueue(NewTask("send_email",
+					testutil.JSON(map[string]interface{}{"recipient_id": i + 123})),
+					Queue(fmt.Sprintf(DynamicQueueNameFmt, tcn, i%2)))
+				if err != nil {
+					t.Fatalf("could not enqueue a task: %v", err)
+				}
+			}
+
+			for i := 0; i < serverNum; i++ {
+				srv := NewServer(redisConnOpt, Config{
+					Concurrency:      tc.concurrency,
+					LogLevel:         testLogLevel,
+					QueueConcurrency: map[string]int{base.DefaultQueueName: tc.queueConcurrency},
+				})
+				err = srv.Start(HandlerFunc(handle))
+				if err != nil {
+					t.Fatal(err)
+				}
+				srv.AddQueue(fmt.Sprintf(DynamicQueueNameFmt, tcn, i), 1, tc.queueConcurrency)
+				servers[i] = srv
+			}
+			defer func() {
+				for _, srv := range servers {
+					srv.Shutdown()
+				}
+			}()
+
+			time.Sleep(time.Second)
+			inspector := NewInspector(redisConnOpt)
+
+			var tasks []*TaskInfo
+
+			for i := range servers {
+				qtasks, err := inspector.ListActiveTasks(fmt.Sprintf(DynamicQueueNameFmt, tcn, i))
+				if err != nil {
+					t.Fatalf("could not list active tasks: %v", err)
+				}
+				tasks = append(tasks, qtasks...)
+			}
+
+			if len(tasks) != tc.wantActiveNum {
+				t.Errorf("dynamic queue has %d active tasks, want %d", len(tasks), tc.wantActiveNum)
+			}
+		})
+	}
+}
+
 func TestServerRun(t *testing.T) {
 	// https://github.com/go-redis/redis/issues/1029
 	ignoreOpt := goleak.IgnoreTopFunction("github.com/redis/go-redis/v9/internal/pool.(*ConnPool).reaper")

subscriber.go

@@ -80,6 +80,9 @@ func (s *subscriber) start(wg *sync.WaitGroup) {
 				s.logger.Debug("Subscriber done")
 				return
 			case msg := <-cancelCh:
+				if msg == nil {
+					return
+				}
 				cancel, ok := s.cancelations.Get(msg.Payload)
 				if ok {
 					cancel()