Repository: hibiken/asynq (go)

Issue:
[FEATURE REQUEST] Instrumentation/Tracing for asynq redis client
**Is your feature request related to a problem? Please describe.**
- I want to add tracing to the underlying redis client instance using `dd-trace-go`. 
- Is it possible to get access to the underlying redis instance so I can wrap the client with a function like the one below?

```golang
import (
	"github.com/go-redis/redis/v7"
	ddRedis "gopkg.in/DataDog/dd-trace-go.v1/contrib/go-redis/redis.v7"
)

func TraceClient(rClient redis.UniversalClient) {
	ddRedis.WrapClient(
		rClient,
		ddRedis.WithServiceName(config.ServiceName()+"-redis"),
		ddRedis.WithAnalytics(config.Enabled()),
	)
}

```



**Describe alternatives you've considered**
- I am also looking if the way to go about this is creating a `RedisConnOpt` interface that returns a wrapped redis instance with datadog tracing. What do you think?

https://pkg.go.dev/gopkg.in/DataDog/dd-trace-go.v1@v1.33.0/contrib/go-redis/redis.v7#WrapClient


Pull request description:
Add EnqueueContext method to Client
Closes #321

Patch:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa5569d..e28b9ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- `EnqueueContext` method is added to `Client`.
+
+### Fixed
+
+- Fixed an error when user pass a duration less than 1s to `Unique` option
+
 ## [0.19.0] - 2021-11-06
 
 ### Changed
diff --git a/client.go b/client.go
index 61db5bf..078116e 100644
--- a/client.go
+++ b/client.go
@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
@@ -292,7 +293,7 @@ func (c *Client) Close() error {
 	return c.rdb.Close()
 }
 
-// Enqueue enqueues the given task to be processed asynchronously.
+// Enqueue enqueues the given task to a queue.
 //
 // Enqueue returns TaskInfo and nil error if the task is enqueued successfully, otherwise returns a non-nil error.
 //
@@ -302,7 +303,25 @@ func (c *Client) Close() error {
 // By deafult, max retry is set to 25 and timeout is set to 30 minutes.
 //
 // If no ProcessAt or ProcessIn options are provided, the task will be pending immediately.
+//
+// Enqueue uses context.Background internally; to specify the context, use EnqueueContext.
 func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
+	return c.EnqueueContext(context.Background(), task, opts...)
+}
+
+// EnqueueContext enqueues the given task to a queue.
+//
+// EnqueueContext returns TaskInfo and nil error if the task is enqueued successfully, otherwise returns a non-nil error.
+//
+// The argument opts specifies the behavior of task processing.
+// If there are conflicting Option values the last one overrides others.
+// Any options provided to NewTask can be overridden by options passed to Enqueue.
+// By deafult, max retry is set to 25 and timeout is set to 30 minutes.
+//
+// If no ProcessAt or ProcessIn options are provided, the task will be pending immediately.
+//
+// The first argument context applies to the enqueue operation. To specify task timeout and deadline, use Timeout and Deadline option instead.
+func (c *Client) EnqueueContext(ctx context.Context, task *Task, opts ...Option) (*TaskInfo, error) {
 	if strings.TrimSpace(task.Type()) == "" {
 		return nil, fmt.Errorf("task typename cannot be empty")
 	}
@@ -343,10 +362,10 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 	var state base.TaskState
 	if opt.processAt.Before(now) || opt.processAt.Equal(now) {
 		opt.processAt = now
-		err = c.enqueue(msg, opt.uniqueTTL)
+		err = c.enqueue(ctx, msg, opt.uniqueTTL)
 		state = base.TaskStatePending
 	} else {
-		err = c.schedule(msg, opt.processAt, opt.uniqueTTL)
+		err = c.schedule(ctx, msg, opt.processAt, opt.uniqueTTL)
 		state = base.TaskStateScheduled
 	}
 	switch {
@@ -360,17 +379,17 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 	return newTaskInfo(msg, state, opt.processAt, nil), nil
 }
 
-func (c *Client) enqueue(msg *base.TaskMessage, uniqueTTL time.Duration) error {
+func (c *Client) enqueue(ctx context.Context, msg *base.TaskMessage, uniqueTTL time.Duration) error {
 	if uniqueTTL > 0 {
-		return c.rdb.EnqueueUnique(msg, uniqueTTL)
+		return c.rdb.EnqueueUnique(ctx, msg, uniqueTTL)
 	}
-	return c.rdb.Enqueue(msg)
+	return c.rdb.Enqueue(ctx, msg)
 }
 
-func (c *Client) schedule(msg *base.TaskMessage, t time.Time, uniqueTTL time.Duration) error {
+func (c *Client) schedule(ctx context.Context, msg *base.TaskMessage, t time.Time, uniqueTTL time.Duration) error {
 	if uniqueTTL > 0 {
 		ttl := t.Add(uniqueTTL).Sub(time.Now())
-		return c.rdb.ScheduleUnique(msg, t, ttl)
+		return c.rdb.ScheduleUnique(ctx, msg, t, ttl)
 	}
-	return c.rdb.Schedule(msg, t)
+	return c.rdb.Schedule(ctx, msg, t)
 }
diff --git a/internal/base/base.go b/internal/base/base.go
index 5315f17..2ef52fe 100644
--- a/internal/base/base.go
+++ b/internal/base/base.go
@@ -660,14 +660,14 @@ func (c *Cancelations) Get(id string) (fn context.CancelFunc, ok bool) {
 // See rdb.RDB as a reference implementation.
 type Broker interface {
 	Ping() error
-	Enqueue(msg *TaskMessage) error
-	EnqueueUnique(msg *TaskMessage, ttl time.Duration) error
+	Enqueue(ctx context.Context, msg *TaskMessage) error
+	EnqueueUnique(ctx context.Context, msg *TaskMessage, ttl time.Duration) error
 	Dequeue(qnames ...string) (*TaskMessage, time.Time, error)
 	Done(msg *TaskMessage) error
 	MarkAsComplete(msg *TaskMessage) error
 	Requeue(msg *TaskMessage) error
-	Schedule(msg *TaskMessage, processAt time.Time) error
-	ScheduleUnique(msg *TaskMessage, processAt time.Time, ttl time.Duration) error
+	Schedule(ctx context.Context, msg *TaskMessage, processAt time.Time) error
+	ScheduleUnique(ctx context.Context, msg *TaskMessage, processAt time.Time, ttl time.Duration) error
 	Retry(msg *TaskMessage, processAt time.Time, errMsg string, isFailure bool) error
 	Archive(msg *TaskMessage, errMsg string) error
 	ForwardIfReady(qnames ...string) error
diff --git a/internal/rdb/rdb.go b/internal/rdb/rdb.go
index 3a611d7..a2a0fe7 100644
--- a/internal/rdb/rdb.go
+++ b/internal/rdb/rdb.go
@@ -43,16 +43,16 @@ func (r *RDB) Ping() error {
 	return r.client.Ping(context.Background()).Err()
 }
 
-func (r *RDB) runScript(op errors.Op, script *redis.Script, keys []string, args ...interface{}) error {
-	if err := script.Run(context.Background(), r.client, keys, args...).Err(); err != nil {
+func (r *RDB) runScript(ctx context.Context, op errors.Op, script *redis.Script, keys []string, args ...interface{}) error {
+	if err := script.Run(ctx, r.client, keys, args...).Err(); err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("redis eval error: %v", err))
 	}
 	return nil
 }
 
 // Runs the given script with keys and args and retuns the script's return value as int64.
-func (r *RDB) runScriptWithErrorCode(op errors.Op, script *redis.Script, keys []string, args ...interface{}) (int64, error) {
-	res, err := script.Run(context.Background(), r.client, keys, args...).Result()
+func (r *RDB) runScriptWithErrorCode(ctx context.Context, op errors.Op, script *redis.Script, keys []string, args ...interface{}) (int64, error) {
+	res, err := script.Run(ctx, r.client, keys, args...).Result()
 	if err != nil {
 		return 0, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -91,13 +91,13 @@ return 1
 `)
 
 // Enqueue adds the given task to the pending list of the queue.
-func (r *RDB) Enqueue(msg *base.TaskMessage) error {
+func (r *RDB) Enqueue(ctx context.Context, msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.Enqueue"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -110,7 +110,7 @@ func (r *RDB) Enqueue(msg *base.TaskMessage) error {
 		msg.Timeout,
 		msg.Deadline,
 	}
-	n, err := r.runScriptWithErrorCode(op, enqueueCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, enqueueCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -156,13 +156,13 @@ return 1
 
 // EnqueueUnique inserts the given task if the task's uniqueness lock can be acquired.
 // It returns ErrDuplicateTask if the lock cannot be acquired.
-func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
+func (r *RDB) EnqueueUnique(ctx context.Context, msg *base.TaskMessage, ttl time.Duration) error {
 	var op errors.Op = "rdb.EnqueueUnique"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Internal, "cannot encode task message: %v", err)
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -177,7 +177,7 @@ func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
 		msg.Timeout,
 		msg.Deadline,
 	}
-	n, err := r.runScriptWithErrorCode(op, enqueueUniqueCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, enqueueUniqueCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -334,6 +334,7 @@ return redis.status_reply("OK")
 // It removes a uniqueness lock acquired by the task, if any.
 func (r *RDB) Done(msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.Done"
+	ctx := context.Background()
 	now := time.Now()
 	expireAt := now.Add(statsTTL)
 	keys := []string{
@@ -349,9 +350,9 @@ func (r *RDB) Done(msg *base.TaskMessage) error {
 	// Note: We cannot pass empty unique key when running this script in redis-cluster.
 	if len(msg.UniqueKey) > 0 {
 		keys = append(keys, msg.UniqueKey)
-		return r.runScript(op, doneUniqueCmd, keys, argv...)
+		return r.runScript(ctx, op, doneUniqueCmd, keys, argv...)
 	}
-	return r.runScript(op, doneCmd, keys, argv...)
+	return r.runScript(ctx, op, doneCmd, keys, argv...)
 }
 
 // KEYS[1] -> asynq:{<qname>}:active
@@ -416,6 +417,7 @@ return redis.status_reply("OK")
 // It removes a uniqueness lock acquired by the task, if any.
 func (r *RDB) MarkAsComplete(msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.MarkAsComplete"
+	ctx := context.Background()
 	now := time.Now()
 	statsExpireAt := now.Add(statsTTL)
 	msg.CompletedAt = now.Unix()
@@ -439,9 +441,9 @@ func (r *RDB) MarkAsComplete(msg *base.TaskMessage) error {
 	// Note: We cannot pass empty unique key when running this script in redis-cluster.
 	if len(msg.UniqueKey) > 0 {
 		keys = append(keys, msg.UniqueKey)
-		return r.runScript(op, markAsCompleteUniqueCmd, keys, argv...)
+		return r.runScript(ctx, op, markAsCompleteUniqueCmd, keys, argv...)
 	}
-	return r.runScript(op, markAsCompleteCmd, keys, argv...)
+	return r.runScript(ctx, op, markAsCompleteCmd, keys, argv...)
 }
 
 // KEYS[1] -> asynq:{<qname>}:active
@@ -464,13 +466,14 @@ return redis.status_reply("OK")`)
 // Requeue moves the task from active queue to the specified queue.
 func (r *RDB) Requeue(msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.Requeue"
+	ctx := context.Background()
 	keys := []string{
 		base.ActiveKey(msg.Queue),
 		base.DeadlinesKey(msg.Queue),
 		base.PendingKey(msg.Queue),
 		base.TaskKey(msg.Queue, msg.ID),
 	}
-	return r.runScript(op, requeueCmd, keys, msg.ID)
+	return r.runScript(ctx, op, requeueCmd, keys, msg.ID)
 }
 
 // KEYS[1] -> asynq:{<qname>}:t:<task_id>
@@ -498,13 +501,13 @@ return 1
 `)
 
 // Schedule adds the task to the scheduled set to be processed in the future.
-func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
+func (r *RDB) Schedule(ctx context.Context, msg *base.TaskMessage, processAt time.Time) error {
 	var op errors.Op = "rdb.Schedule"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -518,7 +521,7 @@ func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
 		msg.Timeout,
 		msg.Deadline,
 	}
-	n, err := r.runScriptWithErrorCode(op, scheduleCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, scheduleCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -562,13 +565,13 @@ return 1
 
 // ScheduleUnique adds the task to the backlog queue to be processed in the future if the uniqueness lock can be acquired.
 // It returns ErrDuplicateTask if the lock cannot be acquired.
-func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
+func (r *RDB) ScheduleUnique(ctx context.Context, msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
 	var op errors.Op = "rdb.ScheduleUnique"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode task message: %v", err))
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -584,7 +587,7 @@ func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl tim
 		msg.Timeout,
 		msg.Deadline,
 	}
-	n, err := r.runScriptWithErrorCode(op, scheduleUniqueCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, scheduleUniqueCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -634,6 +637,7 @@ return redis.status_reply("OK")`)
 // if isFailure is true increments the retried counter.
 func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, isFailure bool) error {
 	var op errors.Op = "rdb.Retry"
+	ctx := context.Background()
 	now := time.Now()
 	modified := *msg
 	if isFailure {
@@ -661,7 +665,7 @@ func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, i
 		expireAt.Unix(),
 		isFailure,
 	}
-	return r.runScript(op, retryCmd, keys, argv...)
+	return r.runScript(ctx, op, retryCmd, keys, argv...)
 }
 
 const (
@@ -706,6 +710,7 @@ return redis.status_reply("OK")`)
 // It also trims the archive by timestamp and set size.
 func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
 	var op errors.Op = "rdb.Archive"
+	ctx := context.Background()
 	now := time.Now()
 	modified := *msg
 	modified.ErrorMsg = errMsg
@@ -732,7 +737,7 @@ func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
 		maxArchiveSize,
 		expireAt.Unix(),
 	}
-	return r.runScript(op, archiveCmd, keys, argv...)
+	return r.runScript(ctx, op, archiveCmd, keys, argv...)
 }
 
 // ForwardIfReady checks scheduled and retry sets of the given queues
@@ -903,6 +908,7 @@ return redis.status_reply("OK")`)
 // WriteServerState writes server state data to redis with expiration set to the value ttl.
 func (r *RDB) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo, ttl time.Duration) error {
 	var op errors.Op = "rdb.WriteServerState"
+	ctx := context.Background()
 	bytes, err := base.EncodeServerInfo(info)
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode server info: %v", err))
@@ -918,13 +924,13 @@ func (r *RDB) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo
 	}
 	skey := base.ServerInfoKey(info.Host, info.PID, info.ServerID)
 	wkey := base.WorkersKey(info.Host, info.PID, info.ServerID)
-	if err := r.client.ZAdd(context.Background(), base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
+	if err := r.client.ZAdd(ctx, base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
-	if err := r.client.ZAdd(context.Background(), base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
+	if err := r.client.ZAdd(ctx, base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
-	return r.runScript(op, writeServerStateCmd, []string{skey, wkey}, args...)
+	return r.runScript(ctx, op, writeServerStateCmd, []string{skey, wkey}, args...)
 }
 
 // KEYS[1] -> asynq:servers:{<host:pid:sid>}
@@ -937,15 +943,16 @@ return redis.status_reply("OK")`)
 // ClearServerState deletes server state data from redis.
 func (r *RDB) ClearServerState(host string, pid int, serverID string) error {
 	var op errors.Op = "rdb.ClearServerState"
+	ctx := context.Background()
 	skey := base.ServerInfoKey(host, pid, serverID)
 	wkey := base.WorkersKey(host, pid, serverID)
-	if err := r.client.ZRem(context.Background(), base.AllServers, skey).Err(); err != nil {
+	if err := r.client.ZRem(ctx, base.AllServers, skey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.ZRem(context.Background(), base.AllWorkers, wkey).Err(); err != nil {
+	if err := r.client.ZRem(ctx, base.AllWorkers, wkey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	return r.runScript(op, clearServerStateCmd, []string{skey, wkey})
+	return r.runScript(ctx, op, clearServerStateCmd, []string{skey, wkey})
 }
 
 // KEYS[1]  -> asynq:schedulers:{<schedulerID>}
@@ -962,6 +969,7 @@ return redis.status_reply("OK")`)
 // WriteSchedulerEntries writes scheduler entries data to redis with expiration set to the value ttl.
 func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.SchedulerEntry, ttl time.Duration) error {
 	var op errors.Op = "rdb.WriteSchedulerEntries"
+	ctx := context.Background()
 	args := []interface{}{ttl.Seconds()}
 	for _, e := range entries {
 		bytes, err := base.EncodeSchedulerEntry(e)
@@ -972,21 +980,22 @@ func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.Schedule
 	}
 	exp := time.Now().Add(ttl).UTC()
 	key := base.SchedulerEntriesKey(schedulerID)
-	err := r.client.ZAdd(context.Background(), base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
+	err := r.client.ZAdd(ctx, base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
 	if err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
-	return r.runScript(op, writeSchedulerEntriesCmd, []string{key}, args...)
+	return r.runScript(ctx, op, writeSchedulerEntriesCmd, []string{key}, args...)
 }
 
 // ClearSchedulerEntries deletes scheduler entries data from redis.
 func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 	var op errors.Op = "rdb.ClearSchedulerEntries"
+	ctx := context.Background()
 	key := base.SchedulerEntriesKey(scheduelrID)
-	if err := r.client.ZRem(context.Background(), base.AllSchedulers, key).Err(); err != nil {
+	if err := r.client.ZRem(ctx, base.AllSchedulers, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.Del(context.Background(), key).Err(); err != nil {
+	if err := r.client.Del(ctx, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
@@ -995,8 +1004,9 @@ func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 // CancelationPubSub returns a pubsub for cancelation messages.
 func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 	var op errors.Op = "rdb.CancelationPubSub"
-	pubsub := r.client.Subscribe(context.Background(), base.CancelChannel)
-	_, err := pubsub.Receive(context.Background())
+	ctx := context.Background()
+	pubsub := r.client.Subscribe(ctx, base.CancelChannel)
+	_, err := pubsub.Receive(ctx)
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub receive error: %v", err))
 	}
@@ -1007,7 +1017,8 @@ func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 // The message is the ID for the task to be canceled.
 func (r *RDB) PublishCancelation(id string) error {
 	var op errors.Op = "rdb.PublishCancelation"
-	if err := r.client.Publish(context.Background(), base.CancelChannel, id).Err(); err != nil {
+	ctx := context.Background()
+	if err := r.client.Publish(ctx, base.CancelChannel, id).Err(); err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub publish error: %v", err))
 	}
 	return nil
@@ -1028,6 +1039,7 @@ const maxEvents = 1000
 // RecordSchedulerEnqueueEvent records the time when the given task was enqueued.
 func (r *RDB) RecordSchedulerEnqueueEvent(entryID string, event *base.SchedulerEnqueueEvent) error {
 	var op errors.Op = "rdb.RecordSchedulerEnqueueEvent"
+	ctx := context.Background()
 	data, err := base.EncodeSchedulerEnqueueEvent(event)
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode scheduler enqueue event: %v", err))
@@ -1040,14 +1052,15 @@ func (r *RDB) RecordSchedulerEnqueueEvent(entryID string, event *base.SchedulerE
 		data,
 		maxEvents,
 	}
-	return r.runScript(op, recordSchedulerEnqueueEventCmd, keys, argv...)
+	return r.runScript(ctx, op, recordSchedulerEnqueueEventCmd, keys, argv...)
 }
 
 // ClearSchedulerHistory deletes the enqueue event history for the given scheduler entry.
 func (r *RDB) ClearSchedulerHistory(entryID string) error {
 	var op errors.Op = "rdb.ClearSchedulerHistory"
+	ctx := context.Background()
 	key := base.SchedulerHistoryKey(entryID)
-	if err := r.client.Del(context.Background(), key).Err(); err != nil {
+	if err := r.client.Del(ctx, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
@@ -1056,8 +1069,9 @@ func (r *RDB) ClearSchedulerHistory(entryID string) error {
 // WriteResult writes the given result data for the specified task.
 func (r *RDB) WriteResult(qname, taskID string, data []byte) (int, error) {
 	var op errors.Op = "rdb.WriteResult"
+	ctx := context.Background()
 	taskKey := base.TaskKey(qname, taskID)
-	if err := r.client.HSet(context.Background(), taskKey, "result", data).Err(); err != nil {
+	if err := r.client.HSet(ctx, taskKey, "result", data).Err(); err != nil {
 		return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "hset", Err: err})
 	}
 	return len(data), nil


Test patch:
diff --git a/internal/rdb/benchmark_test.go b/internal/rdb/benchmark_test.go
index 8880b3b..468e309 100644
--- a/internal/rdb/benchmark_test.go
+++ b/internal/rdb/benchmark_test.go
@@ -5,6 +5,7 @@
 package rdb
 
 import (
+	"context"
 	"fmt"
 	"testing"
 	"time"
@@ -15,6 +16,7 @@ import (
 
 func BenchmarkEnqueue(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := asynqtest.NewTaskMessage("task1", nil)
 	b.ResetTimer()
 
@@ -23,7 +25,7 @@ func BenchmarkEnqueue(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.Enqueue(msg); err != nil {
+		if err := r.Enqueue(ctx, msg); err != nil {
 			b.Fatalf("Enqueue failed: %v", err)
 		}
 	}
@@ -31,6 +33,7 @@ func BenchmarkEnqueue(b *testing.B) {
 
 func BenchmarkEnqueueUnique(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := &base.TaskMessage{
 		Type:      "task1",
 		Payload:   nil,
@@ -45,7 +48,7 @@ func BenchmarkEnqueueUnique(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.EnqueueUnique(msg, uniqueTTL); err != nil {
+		if err := r.EnqueueUnique(ctx, msg, uniqueTTL); err != nil {
 			b.Fatalf("EnqueueUnique failed: %v", err)
 		}
 	}
@@ -53,6 +56,7 @@ func BenchmarkEnqueueUnique(b *testing.B) {
 
 func BenchmarkSchedule(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := asynqtest.NewTaskMessage("task1", nil)
 	processAt := time.Now().Add(3 * time.Minute)
 	b.ResetTimer()
@@ -62,7 +66,7 @@ func BenchmarkSchedule(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.Schedule(msg, processAt); err != nil {
+		if err := r.Schedule(ctx, msg, processAt); err != nil {
 			b.Fatalf("Schedule failed: %v", err)
 		}
 	}
@@ -70,6 +74,7 @@ func BenchmarkSchedule(b *testing.B) {
 
 func BenchmarkScheduleUnique(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := &base.TaskMessage{
 		Type:      "task1",
 		Payload:   nil,
@@ -85,7 +90,7 @@ func BenchmarkScheduleUnique(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.ScheduleUnique(msg, processAt, uniqueTTL); err != nil {
+		if err := r.ScheduleUnique(ctx, msg, processAt, uniqueTTL); err != nil {
 			b.Fatalf("EnqueueUnique failed: %v", err)
 		}
 	}
@@ -93,6 +98,7 @@ func BenchmarkScheduleUnique(b *testing.B) {
 
 func BenchmarkDequeueSingleQueue(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
@@ -101,7 +107,7 @@ func BenchmarkDequeueSingleQueue(b *testing.B) {
 		for i := 0; i < 10; i++ {
 			m := asynqtest.NewTaskMessageWithQueue(
 				fmt.Sprintf("task%d", i), nil, base.DefaultQueueName)
-			if err := r.Enqueue(m); err != nil {
+			if err := r.Enqueue(ctx, m); err != nil {
 				b.Fatalf("Enqueue failed: %v", err)
 			}
 		}
@@ -116,6 +122,7 @@ func BenchmarkDequeueSingleQueue(b *testing.B) {
 func BenchmarkDequeueMultipleQueues(b *testing.B) {
 	qnames := []string{"critical", "default", "low"}
 	r := setup(b)
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
@@ -125,7 +132,7 @@ func BenchmarkDequeueMultipleQueues(b *testing.B) {
 			for _, qname := range qnames {
 				m := asynqtest.NewTaskMessageWithQueue(
 					fmt.Sprintf("%s_task%d", qname, i), nil, qname)
-				if err := r.Enqueue(m); err != nil {
+				if err := r.Enqueue(ctx, m); err != nil {
 					b.Fatalf("Enqueue failed: %v", err)
 				}
 			}
diff --git a/internal/rdb/inspect_test.go b/internal/rdb/inspect_test.go
index 8b380ab..1a9f49f 100644
--- a/internal/rdb/inspect_test.go
+++ b/internal/rdb/inspect_test.go
@@ -879,7 +879,7 @@ func TestListScheduledPagination(t *testing.T) {
 	// create 100 tasks with an increasing number of wait time.
 	for i := 0; i < 100; i++ {
 		msg := h.NewTaskMessage(fmt.Sprintf("task %d", i), nil)
-		if err := r.Schedule(msg, time.Now().Add(time.Duration(i)*time.Second)); err != nil {
+		if err := r.Schedule(context.Background(), msg, time.Now().Add(time.Duration(i)*time.Second)); err != nil {
 			t.Fatal(err)
 		}
 	}
diff --git a/internal/rdb/rdb_test.go b/internal/rdb/rdb_test.go
index abb0d39..8d6a464 100644
--- a/internal/rdb/rdb_test.go
+++ b/internal/rdb/rdb_test.go
@@ -78,7 +78,7 @@ func TestEnqueue(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		err := r.Enqueue(tc.msg)
+		err := r.Enqueue(context.Background(), tc.msg)
 		if err != nil {
 			t.Errorf("(*RDB).Enqueue(msg) = %v, want nil", err)
 			continue
@@ -148,11 +148,11 @@ func TestEnqueueTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.Enqueue(tc.firstMsg); err != nil {
+		if err := r.Enqueue(context.Background(), tc.firstMsg); err != nil {
 			t.Errorf("First message: Enqueue failed: %v", err)
 			continue
 		}
-		if err := r.Enqueue(tc.secondMsg); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.Enqueue(context.Background(), tc.secondMsg); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: Enqueue returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
@@ -181,7 +181,7 @@ func TestEnqueueUnique(t *testing.T) {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
 		// Enqueue the first message, should succeed.
-		err := r.EnqueueUnique(tc.msg, tc.ttl)
+		err := r.EnqueueUnique(context.Background(), tc.msg, tc.ttl)
 		if err != nil {
 			t.Errorf("First message: (*RDB).EnqueueUnique(%v, %v) = %v, want nil",
 				tc.msg, tc.ttl, err)
@@ -241,7 +241,7 @@ func TestEnqueueUnique(t *testing.T) {
 		}
 
 		// Enqueue the second message, should fail.
-		got := r.EnqueueUnique(tc.msg, tc.ttl)
+		got := r.EnqueueUnique(context.Background(), tc.msg, tc.ttl)
 		if !errors.Is(got, errors.ErrDuplicateTask) {
 			t.Errorf("Second message: (*RDB).EnqueueUnique(msg, ttl) = %v, want %v", got, errors.ErrDuplicateTask)
 			continue
@@ -282,11 +282,11 @@ func TestEnqueueUniqueTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.EnqueueUnique(tc.firstMsg, ttl); err != nil {
+		if err := r.EnqueueUnique(context.Background(), tc.firstMsg, ttl); err != nil {
 			t.Errorf("First message: EnqueueUnique failed: %v", err)
 			continue
 		}
-		if err := r.EnqueueUnique(tc.secondMsg, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.EnqueueUnique(context.Background(), tc.secondMsg, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: EnqueueUnique returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
@@ -1162,7 +1162,7 @@ func TestSchedule(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case
 
-		err := r.Schedule(tc.msg, tc.processAt)
+		err := r.Schedule(context.Background(), tc.msg, tc.processAt)
 		if err != nil {
 			t.Errorf("(*RDB).Schedule(%v, %v) = %v, want nil",
 				tc.msg, tc.processAt, err)
@@ -1245,11 +1245,11 @@ func TestScheduleTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.Schedule(tc.firstMsg, processAt); err != nil {
+		if err := r.Schedule(context.Background(), tc.firstMsg, processAt); err != nil {
 			t.Errorf("First message: Schedule failed: %v", err)
 			continue
 		}
-		if err := r.Schedule(tc.secondMsg, processAt); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.Schedule(context.Background(), tc.secondMsg, processAt); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: Schedule returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
@@ -1279,7 +1279,7 @@ func TestScheduleUnique(t *testing.T) {
 		h.FlushDB(t, r.client) // clean up db before each test case
 
 		desc := "(*RDB).ScheduleUnique(msg, processAt, ttl)"
-		err := r.ScheduleUnique(tc.msg, tc.processAt, tc.ttl)
+		err := r.ScheduleUnique(context.Background(), tc.msg, tc.processAt, tc.ttl)
 		if err != nil {
 			t.Errorf("Frist task: %s = %v, want nil", desc, err)
 			continue
@@ -1336,7 +1336,7 @@ func TestScheduleUnique(t *testing.T) {
 		}
 
 		// Enqueue the second message, should fail.
-		got := r.ScheduleUnique(tc.msg, tc.processAt, tc.ttl)
+		got := r.ScheduleUnique(context.Background(), tc.msg, tc.processAt, tc.ttl)
 		if !errors.Is(got, errors.ErrDuplicateTask) {
 			t.Errorf("Second task: %s = %v, want %v", desc, got, errors.ErrDuplicateTask)
 			continue
@@ -1379,11 +1379,11 @@ func TestScheduleUniqueTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.ScheduleUnique(tc.firstMsg, processAt, ttl); err != nil {
+		if err := r.ScheduleUnique(context.Background(), tc.firstMsg, processAt, ttl); err != nil {
 			t.Errorf("First message: ScheduleUnique failed: %v", err)
 			continue
 		}
-		if err := r.ScheduleUnique(tc.secondMsg, processAt, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.ScheduleUnique(context.Background(), tc.secondMsg, processAt, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: ScheduleUnique returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
diff --git a/internal/testbroker/testbroker.go b/internal/testbroker/testbroker.go
index cec9463..5f3a023 100644
--- a/internal/testbroker/testbroker.go
+++ b/internal/testbroker/testbroker.go
@@ -6,6 +6,7 @@
 package testbroker
 
 import (
+	"context"
 	"errors"
 	"sync"
 	"time"
@@ -45,22 +46,22 @@ func (tb *TestBroker) Wakeup() {
 	tb.sleeping = false
 }
 
-func (tb *TestBroker) Enqueue(msg *base.TaskMessage) error {
+func (tb *TestBroker) Enqueue(ctx context.Context, msg *base.TaskMessage) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Enqueue(msg)
+	return tb.real.Enqueue(ctx, msg)
 }
 
-func (tb *TestBroker) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
+func (tb *TestBroker) EnqueueUnique(ctx context.Context, msg *base.TaskMessage, ttl time.Duration) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.EnqueueUnique(msg, ttl)
+	return tb.real.EnqueueUnique(ctx, msg, ttl)
 }
 
 func (tb *TestBroker) Dequeue(qnames ...string) (*base.TaskMessage, time.Time, error) {
@@ -99,22 +100,22 @@ func (tb *TestBroker) Requeue(msg *base.TaskMessage) error {
 	return tb.real.Requeue(msg)
 }
 
-func (tb *TestBroker) Schedule(msg *base.TaskMessage, processAt time.Time) error {
+func (tb *TestBroker) Schedule(ctx context.Context, msg *base.TaskMessage, processAt time.Time) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Schedule(msg, processAt)
+	return tb.real.Schedule(ctx, msg, processAt)
 }
 
-func (tb *TestBroker) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
+func (tb *TestBroker) ScheduleUnique(ctx context.Context, msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.ScheduleUnique(msg, processAt, ttl)
+	return tb.real.ScheduleUnique(ctx, msg, processAt, ttl)
 }
 
 func (tb *TestBroker) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, isFailure bool) error {
diff --git a/processor_test.go b/processor_test.go
index 4ee28be..21ba01f 100644
--- a/processor_test.go
+++ b/processor_test.go
@@ -126,7 +126,7 @@ func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 
 		p.start(&sync.WaitGroup{})
 		for _, msg := range tc.incoming {
-			err := rdbClient.Enqueue(msg)
+			err := rdbClient.Enqueue(context.Background(), msg)
 			if err != nil {
 				p.shutdown()
 				t.Fatal(err)