v0.6.1

Allow custom logger to be used in Background
Extract out log package
2026-05-01 17:35:51 +08:00 · 2020-03-12 08:42:34 -07:00 · 2020-03-12 08:40:37 -07:00 · 2020-03-09 07:17:52 -07:00 · 2020-03-09 06:09:07 -07:00 · 2020-03-08 17:12:42 -07:00
40 changed files with 2292 additions and 779 deletions
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,8 +4,11 @@ git:
  depth: 1
 env:
  - GO111MODULE=on # go modules are the default
-go: [1.12.x, 1.13.x]
+go: [1.12.x, 1.13.x, 1.14.x]
+script:
+  - go test -race -v -coverprofile=coverage.txt -covermode=atomic ./...
 services:
  - redis-server
 after_success:
  - bash ./.travis/benchcmp.sh
+  - bash <(curl -s https://codecov.io/bash)
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,30 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

 ## [Unreleased]

+## [0.6.1] - 2020-03-12
+
+### Added
+
+- `Client` can optionally schedule task with `asynq.Deadline(time)` to specify deadline for task's context. Default is no deadline.
+- `Logger` option was added to config, which allows user to specify the logger used by the background instance.
+
+## [0.6.0] - 2020-03-01
+
+### Added
+
+- Added `ServeMux` type to make it easy for users to implement Handler interface.
+- `ErrorHandler` type was added. Allow users to specify error handling function (e.g. Report error to error reporting service such as Honeybadger, Bugsnag, etc)
+
+## [0.5.0] - 2020-02-23
+
+### Changed
+
+- `Client` API has changed. Use `Enqueue`, `EnqueueAt` and `EnqueueIn` to enqueue and schedule tasks.
+
+### Added
+
+- `asynqmon workers` was added to list all running workers information
+
 ## [0.4.0] - 2020-02-13

 ### Changed
--- a/README.md
+++ b/README.md
@@ -5,21 +5,14 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/hibiken/asynq)](https://goreportcard.com/report/github.com/hibiken/asynq)
 [![GoDoc](https://godoc.org/github.com/hibiken/asynq?status.svg)](https://godoc.org/github.com/hibiken/asynq)
 [![Gitter chat](https://badges.gitter.im/go-asynq/gitter.svg)](https://gitter.im/go-asynq/community)
+[![codecov](https://codecov.io/gh/hibiken/asynq/branch/master/graph/badge.svg)](https://codecov.io/gh/hibiken/asynq)

 Asynq is a simple Go library for queueing tasks and processing them in the background with workers.  
 It is backed by Redis and it is designed to have a low barrier to entry. It should be integrated in your web stack easily.

 **Important Note**: Current major version is zero (v0.x.x) to accomodate rapid development and fast iteration while getting early feedback from users. The public API could change without a major version update before v1.0.0 release.

-![Gif](/docs/assets/demo.gif)
-
-## Installation
-
-To install `asynq` library, run the following command:
-
-```sh
-go get -u github.com/hibiken/asynq
-```
+![Task Queue Diagram](/docs/assets/task-queue.png)

 ## Quickstart

@@ -29,50 +22,66 @@ First, make sure you are running a Redis server locally.
 $ redis-server
 ```

-To create and schedule tasks, use `Client` and provide a task and when to process the task.
+To create and schedule tasks, use `Client` and provide a task and when to enqueue the task.  
+A task will be processed by a background worker as soon as the task gets enqueued.  
+Scheduled tasks will be stored in Redis and will be enqueued at the specified time.  

 ```go
 func main() {
    r := &asynq.RedisClientOpt{
-        Addr: "localhost:6379",
+        Addr: "127.0.0.1:6379",
    }

    client := asynq.NewClient(r)

-    // Create a task with task type and payload
-    t1 := asynq.NewTask("send_welcome_email", map[string]interface{}{"user_id": 42})
+    // Create a task with task type and payload.
+    t1 := asynq.NewTask("email:signup", map[string]interface{}{"user_id": 42})

-    t2 := asynq.NewTask("send_reminder_email", map[string]interface{}{"user_id": 42})
+    t2 := asynq.NewTask("email:reminder", map[string]interface{}{"user_id": 42})

-    // Process immediately
-    err := client.Schedule(t1, time.Now())
+    // Enqueue immediately.
+    err := client.Enqueue(t1)

-    // Process 24 hrs later
-    err = client.Schedule(t2, time.Now().Add(24 * time.Hour))
+    // Enqueue 24 hrs later.
+    err = client.EnqueueIn(24*time.Hour, t2)

-    // If processing fails, retry up to 10 times (Default is 25)
-    err = client.Schedule(t1, time.Now(), asynq.Retry(10))
+    // Enqueue at specific time.
+    err = client.EnqueueAt(time.Date(2020, time.March, 6, 10, 0, 0, 0, time.UTC), t2)

-    // Use custom queue called "critical"
-    err = client.Schedule(t1, time.Now(), asynq.Queue("critical"))
-
-    // Use timeout to specify how long a task may run (Default is no limit)
-    err = client.Schedule(t1, time.Now(), asynq.Timeout(30 * time.Second))
+    // Pass vararg options to specify processing behavior for the given task.
+    //
+    // MaxRetry specifies the max number of retry if the task fails (Default is 25).
+    // Queue specifies which queue to enqueue this task to (Default is "default" queue).
+    // Timeout specifies the the task timeout (Default is no timeout).
+    err = client.Enqueue(t1, asynq.MaxRetry(10), asynq.Queue("critical"), asynq.Timeout(time.Minute))
 }
 ```

 To start the background workers, use `Background` and provide your `Handler` to process the tasks.

+`Handler` is an interface with one method `ProcessTask` with the following signature.
+
+```go
+// ProcessTask should return nil if the processing of a task is successful.
+//
+// If ProcessTask return a non-nil error or panics, the task will be retried after delay.
+type Handler interface {
+    ProcessTask(context.Context, *asynq.Task) error
+}
+```
+
+You can optionally use `ServeMux` to create a handler, just as you would with `"net/http"` Handler.
+
 ```go
 func main() {
    r := &asynq.RedisClientOpt{
-        Addr: "localhost:6379",
+        Addr: "127.0.0.1:6379",
    }

    bg := asynq.NewBackground(r, &asynq.Config{
        // Specify how many concurrent workers to use
        Concurrency: 10,
-        // You can optionally create multiple queues with different priority.
+        // Optionally specify multiple queues with different priority.
        Queues: map[string]int{
            "critical": 6,
            "default":  3,
@@ -81,26 +90,54 @@ func main() {
        // See the godoc for other configuration options
    })

-    bg.Run(handler)
+    // mux maps a type to a handler
+    mux := asynq.NewServeMux()
+    mux.HandleFunc("email:signup", signupEmailHandler)
+    mux.HandleFunc("email:reminder", reminderEmailHandler)
+    // ...register other handlers...
+
+    bg.Run(mux)
 }
-```

-`Handler` is an interface with one method `ProcessTask` with the following signature.
-
-```go
-// ProcessTask should return nil if the processing of a task
-// is successful.
-//
-// If ProcessTask return a non-nil error or panics, the task
-// will be retried after delay.
-type Handler interface {
-    ProcessTask(context.Context, *asynq.Task) error
+// function with the same signature as the ProcessTask method for the Handler interface.
+func signupEmailHandler(ctx context.Context, t *asynq.Task) error {
+    id, err := t.Payload.GetInt("user_id")
+    if err != nil {
+        return err
+    }
+    fmt.Printf("Send welcome email to user %d\n", id)
+    // ...your email sending logic...
+    return nil
 }
 ```

 For a more detailed walk-through of the library, see our [Getting Started Guide](https://github.com/hibiken/asynq/wiki/Getting-Started).

-To Learn more about `asynq` features and APIs, see our [Wiki pages](https://github.com/hibiken/asynq/wiki) and [godoc](https://godoc.org/github.com/hibiken/asynq).
+To Learn more about `asynq` features and APIs, see our [Wiki](https://github.com/hibiken/asynq/wiki) and [godoc](https://godoc.org/github.com/hibiken/asynq).
+
+## Command Line Tool
+
+Asynq ships with a command line tool to inspect the state of queues and tasks.
+
+Here's an example of running the `stats` command.
+
+![Gif](/docs/assets/demo.gif)
+
+For details on how to use the tool, refer to the tool's [README](/tools/asynqmon/README.md).
+
+## Installation
+
+To install `asynq` library, run the following command:
+
+```sh
+go get -u github.com/hibiken/asynq
+```
+
+To install the CLI tool, run the following command:
+
+```sh
+go get -u github.com/hibiken/asynq/tools/asynqmon
+```

 ## Requirements

@@ -109,18 +146,6 @@ To Learn more about `asynq` features and APIs, see our [Wiki pages](https://gith
 | [Redis](https://redis.io/) | v2.8+   |
 | [Go](https://golang.org/)  | v1.12+  |

-## Command Line Tool
-
-Asynq ships with a command line tool to inspect the state of queues and tasks.
-
-To install, run the following command:
-
-```sh
-go get -u github.com/hibiken/asynq/tools/asynqmon
-```
-
-For details on how to use the tool, refer to the tool's [README](/tools/asynqmon/README.md).
-
 ## Contributing

 We are open to, and grateful for, any contributions (Github issues/pull-requests, feedback on Gitter channel, etc) made by the community.
@@ -129,6 +154,7 @@ Please see the [Contribution Guide](/CONTRIBUTING.md) before contributing.
 ## Acknowledgements

 - [Sidekiq](https://github.com/mperham/sidekiq) : Many of the design ideas are taken from sidekiq and its Web UI
+- [RQ](https://github.com/rq/rq) : Client APIs are inspired by rq library.
 - [Cobra](https://github.com/spf13/cobra) : Asynqmon CLI is built with cobra

 ## License
--- a/asynq.go
+++ b/asynq.go
@@ -138,6 +138,6 @@ func createRedisClient(r RedisConnOpt) *redis.Client {
 			TLSConfig:        r.TLSConfig,
 		})
 	default:
-		panic(fmt.Sprintf("unexpected type %T for RedisConnOpt", r))
+		panic(fmt.Sprintf("asynq: unexpected type %T for RedisConnOpt", r))
 	}
 }
--- a/asynq_test.go
+++ b/asynq_test.go
@@ -5,12 +5,14 @@
 package asynq

 import (
+	"os"
 	"sort"
 	"testing"

 	"github.com/go-redis/redis/v7"
 	"github.com/google/go-cmp/cmp"
 	h "github.com/hibiken/asynq/internal/asynqtest"
+	"github.com/hibiken/asynq/internal/log"
 )

 // This file defines test helper functions used by
@@ -22,6 +24,8 @@ const (
 	redisDB   = 14
 )

+var testLogger = log.NewLogger(os.Stderr)
+
 func setup(tb testing.TB) *redis.Client {
 	tb.Helper()
 	r := redis.NewClient(&redis.Options{
--- a/background.go
+++ b/background.go
@@ -16,6 +16,7 @@ import (
 	"time"

 	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/rdb"
 )

@@ -34,7 +35,13 @@ type Background struct {
 	mu      sync.Mutex
 	running bool

-	pinfo       *base.ProcessInfo
+	ps *base.ProcessState
+
+	// wait group to wait for all goroutines to finish.
+	wg sync.WaitGroup
+
+	logger Logger
+
 	rdb         *rdb.RDB
 	scheduler   *scheduler
 	processor   *processor
@@ -85,6 +92,59 @@ type Config struct {
 	// The tasks in lower priority queues are processed only when those queues with
 	// higher priorities are empty.
 	StrictPriority bool
+
+	// ErrorHandler handles errors returned by the task handler.
+	//
+	// HandleError is invoked only if the task handler returns a non-nil error.
+	//
+	// Example:
+	// func reportError(task *asynq.Task, err error, retried, maxRetry int) {
+	// 	   if retried >= maxRetry {
+	//         err = fmt.Errorf("retry exhausted for task %s: %w", task.Type, err)
+	// 	   }
+	//     errorReportingService.Notify(err)
+	// })
+	//
+	// ErrorHandler: asynq.ErrorHandlerFunc(reportError)
+	ErrorHandler ErrorHandler
+
+	// Logger specifies the logger used by the background instance.
+	//
+	// If unset, default logger is used.
+	Logger Logger
+}
+
+// An ErrorHandler handles errors returned by the task handler.
+type ErrorHandler interface {
+	HandleError(task *Task, err error, retried, maxRetry int)
+}
+
+// The ErrorHandlerFunc type is an adapter to allow the use of  ordinary functions as a ErrorHandler.
+// If f is a function with the appropriate signature, ErrorHandlerFunc(f) is a ErrorHandler that calls f.
+type ErrorHandlerFunc func(task *Task, err error, retried, maxRetry int)
+
+// HandleError calls fn(task, err, retried, maxRetry)
+func (fn ErrorHandlerFunc) HandleError(task *Task, err error, retried, maxRetry int) {
+	fn(task, err, retried, maxRetry)
+}
+
+// Logger implements logging with various log levels.
+type Logger interface {
+	// Debug logs a message at Debug level.
+	Debug(format string, args ...interface{})
+
+	// Info logs a message at Info level.
+	Info(format string, args ...interface{})
+
+	// Warn logs a message at Warning level.
+	Warn(format string, args ...interface{})
+
+	// Error logs a message at Error level.
+	Error(format string, args ...interface{})
+
+	// Fatal logs a message at Fatal level
+	// and process will exit with status set to 1.
+	Fatal(format string, args ...interface{})
 }

 // Formula taken from https://github.com/mperham/sidekiq.
@@ -118,6 +178,10 @@ func NewBackground(r RedisConnOpt, cfg *Config) *Background {
 	if len(queues) == 0 {
 		queues = defaultQueueConfig
 	}
+	logger := cfg.Logger
+	if logger == nil {
+		logger = log.NewLogger(os.Stderr)
+	}

 	host, err := os.Hostname()
 	if err != nil {
@@ -125,18 +189,19 @@ func NewBackground(r RedisConnOpt, cfg *Config) *Background {
 	}
 	pid := os.Getpid()

-	pinfo := base.NewProcessInfo(host, pid, n, queues, cfg.StrictPriority)
 	rdb := rdb.NewRDB(createRedisClient(r))
-	syncRequestCh := make(chan *syncRequest)
-	cancelations := base.NewCancelations()
-	syncer := newSyncer(syncRequestCh, 5*time.Second)
-	heartbeater := newHeartbeater(rdb, pinfo, 5*time.Second)
-	scheduler := newScheduler(rdb, 5*time.Second, queues)
-	processor := newProcessor(rdb, pinfo, delayFunc, syncRequestCh, cancelations)
-	subscriber := newSubscriber(rdb, cancelations)
+	ps := base.NewProcessState(host, pid, n, queues, cfg.StrictPriority)
+	syncCh := make(chan *syncRequest)
+	cancels := base.NewCancelations()
+	syncer := newSyncer(logger, syncCh, 5*time.Second)
+	heartbeater := newHeartbeater(logger, rdb, ps, 5*time.Second)
+	scheduler := newScheduler(logger, rdb, 5*time.Second, queues)
+	processor := newProcessor(logger, rdb, ps, delayFunc, syncCh, cancels, cfg.ErrorHandler)
+	subscriber := newSubscriber(logger, rdb, cancels)
 	return &Background{
-		pinfo:       pinfo,
+		logger:      logger,
 		rdb:         rdb,
+		ps:          ps,
 		scheduler:   scheduler,
 		processor:   processor,
 		syncer:      syncer,
@@ -145,7 +210,7 @@ func NewBackground(r RedisConnOpt, cfg *Config) *Background {
 	}
 }

-// A Handler processes a task.
+// A Handler processes tasks.
 //
 // ProcessTask should return nil if the processing of a task
 // is successful.
@@ -172,14 +237,20 @@ func (fn HandlerFunc) ProcessTask(ctx context.Context, task *Task) error {
 // a signal, it gracefully shuts down all pending workers and other
 // goroutines to process the tasks.
 func (bg *Background) Run(handler Handler) {
-	logger.SetPrefix(fmt.Sprintf("asynq: pid=%d ", os.Getpid()))
-	logger.info("Starting processing")
+	type prefixLogger interface {
+		SetPrefix(prefix string)
+	}
+	// If logger supports setting prefix, then set prefix for log output.
+	if l, ok := bg.logger.(prefixLogger); ok {
+		l.SetPrefix(fmt.Sprintf("asynq: pid=%d ", os.Getpid()))
+	}
+	bg.logger.Info("Starting processing")

 	bg.start(handler)
 	defer bg.stop()

-	logger.info("Send signal TSTP to stop processing new tasks")
-	logger.info("Send signal TERM or INT to terminate the process")
+	bg.logger.Info("Send signal TSTP to stop processing new tasks")
+	bg.logger.Info("Send signal TERM or INT to terminate the process")

 	// Wait for a signal to terminate.
 	sigs := make(chan os.Signal, 1)
@@ -188,13 +259,13 @@ func (bg *Background) Run(handler Handler) {
 		sig := <-sigs
 		if sig == syscall.SIGTSTP {
 			bg.processor.stop()
-			bg.pinfo.SetState("stopped")
+			bg.ps.SetStatus(base.StatusStopped)
 			continue
 		}
 		break
 	}
 	fmt.Println()
-	logger.info("Starting graceful shutdown")
+	bg.logger.Info("Starting graceful shutdown")
 }

 // starts the background-task processing.
@@ -208,11 +279,11 @@ func (bg *Background) start(handler Handler) {
 	bg.running = true
 	bg.processor.handler = handler

-	bg.heartbeater.start()
-	bg.subscriber.start()
-	bg.syncer.start()
-	bg.scheduler.start()
-	bg.processor.start()
+	bg.heartbeater.start(&bg.wg)
+	bg.subscriber.start(&bg.wg)
+	bg.syncer.start(&bg.wg)
+	bg.scheduler.start(&bg.wg)
+	bg.processor.start(&bg.wg)
 }

 // stops the background-task processing.
@@ -223,18 +294,20 @@ func (bg *Background) stop() {
 		return
 	}

+	// Note: The order of termination is important.
+	// Sender goroutines should be terminated before the receiver goroutines.
+	//
+	// processor -> syncer (via syncCh)
 	bg.scheduler.terminate()
 	bg.processor.terminate()
-	// Note: processor and all worker goroutines need to be exited
-	// before shutting down syncer to avoid goroutine leak.
 	bg.syncer.terminate()
 	bg.subscriber.terminate()
 	bg.heartbeater.terminate()

-	bg.rdb.ClearProcessInfo(bg.pinfo)
+	bg.wg.Wait()
+
 	bg.rdb.Close()
-	bg.processor.handler = nil
 	bg.running = false

-	logger.info("Bye!")
+	bg.logger.Info("Bye!")
 }
--- a/background_test.go
+++ b/background_test.go
@@ -34,9 +34,15 @@ func TestBackground(t *testing.T) {

 	bg.start(HandlerFunc(h))

-	client.Schedule(NewTask("send_email", map[string]interface{}{"recipient_id": 123}), time.Now())
+	err := client.Enqueue(NewTask("send_email", map[string]interface{}{"recipient_id": 123}))
+	if err != nil {
+		t.Errorf("could not enqueue a task: %v", err)
+	}

-	client.Schedule(NewTask("send_email", map[string]interface{}{"recipient_id": 456}), time.Now().Add(time.Hour))
+	err = client.EnqueueAt(time.Now().Add(time.Hour), NewTask("send_email", map[string]interface{}{"recipient_id": 456}))
+	if err != nil {
+		t.Errorf("could not enqueue a task: %v", err)
+	}

 	bg.stop()
 }
--- a/benchmark_test.go
+++ b/benchmark_test.go
@@ -33,7 +33,9 @@ func BenchmarkEndToEndSimple(b *testing.B) {
 		// Create a bunch of tasks
 		for i := 0; i < count; i++ {
 			t := NewTask(fmt.Sprintf("task%d", i), map[string]interface{}{"data": i})
-			client.Schedule(t, time.Now())
+			if err := client.Enqueue(t); err != nil {
+				b.Fatalf("could not enqueue a task: %v", err)
+			}
 		}

 		var wg sync.WaitGroup
@@ -74,11 +76,15 @@ func BenchmarkEndToEnd(b *testing.B) {
 		// Create a bunch of tasks
 		for i := 0; i < count; i++ {
 			t := NewTask(fmt.Sprintf("task%d", i), map[string]interface{}{"data": i})
-			client.Schedule(t, time.Now())
+			if err := client.Enqueue(t); err != nil {
+				b.Fatalf("could not enqueue a task: %v", err)
+			}
 		}
 		for i := 0; i < count; i++ {
 			t := NewTask(fmt.Sprintf("scheduled%d", i), map[string]interface{}{"data": i})
-			client.Schedule(t, time.Now().Add(time.Second))
+			if err := client.EnqueueAt(time.Now().Add(time.Second), t); err != nil {
+				b.Fatalf("could not enqueue a task: %v", err)
+			}
 		}

 		var wg sync.WaitGroup
@@ -129,15 +135,21 @@ func BenchmarkEndToEndMultipleQueues(b *testing.B) {
 		// Create a bunch of tasks
 		for i := 0; i < highCount; i++ {
 			t := NewTask(fmt.Sprintf("task%d", i), map[string]interface{}{"data": i})
-			client.Schedule(t, time.Now(), Queue("high"))
+			if err := client.Enqueue(t, Queue("high")); err != nil {
+				b.Fatalf("could not enqueue a task: %v", err)
+			}
 		}
 		for i := 0; i < defaultCount; i++ {
 			t := NewTask(fmt.Sprintf("task%d", i), map[string]interface{}{"data": i})
-			client.Schedule(t, time.Now())
+			if err := client.Enqueue(t); err != nil {
+				b.Fatalf("could not enqueue a task: %v", err)
+			}
 		}
 		for i := 0; i < lowCount; i++ {
 			t := NewTask(fmt.Sprintf("task%d", i), map[string]interface{}{"data": i})
-			client.Schedule(t, time.Now(), Queue("low"))
+			if err := client.Enqueue(t, Queue("low")); err != nil {
+				b.Fatalf("could not enqueue a task: %v", err)
+			}
 		}

 		var wg sync.WaitGroup
--- a/client.go
+++ b/client.go
@@ -34,9 +34,10 @@ type Option interface{}

 // Internal option representations.
 type (
-	retryOption   int
-	queueOption   string
-	timeoutOption time.Duration
+	retryOption    int
+	queueOption    string
+	timeoutOption  time.Duration
+	deadlineOption time.Time
 )

 // MaxRetry returns an option to specify the max number of times
@@ -64,17 +65,24 @@ 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
+	retry    int
+	queue    string
+	timeout  time.Duration
+	deadline time.Time
 }

 func composeOptions(opts ...Option) option {
 	res := option{
-		retry:   defaultMaxRetry,
-		queue:   base.DefaultQueueName,
-		timeout: 0,
+		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
 		}
@@ -96,29 +106,49 @@ const (
 	defaultMaxRetry = 25
 )

-// Schedule registers a task to be processed at the specified time.
+// EnqueueAt schedules task to be enqueued at the specified time.
 //
-// Schedule returns nil if the task is registered successfully,
-// otherwise returns a non-nil error.
+// EnqueueAt returns nil if the task is scheduled successfully, otherwise returns a non-nil error.
 //
-// opts specifies the behavior of task processing. If there are conflicting
-// Option values the last one overrides others.
-func (c *Client) Schedule(task *Task, processAt time.Time, opts ...Option) error {
+// The argument opts specifies the behavior of task processing.
+// If there are conflicting Option values the last one overrides others.
+func (c *Client) EnqueueAt(t time.Time, task *Task, opts ...Option) error {
 	opt := composeOptions(opts...)
 	msg := &base.TaskMessage{
-		ID:      xid.New(),
-		Type:    task.Type,
-		Payload: task.Payload.data,
-		Queue:   opt.queue,
-		Retry:   opt.retry,
-		Timeout: opt.timeout.String(),
+		ID:       xid.New(),
+		Type:     task.Type,
+		Payload:  task.Payload.data,
+		Queue:    opt.queue,
+		Retry:    opt.retry,
+		Timeout:  opt.timeout.String(),
+		Deadline: opt.deadline.Format(time.RFC3339),
 	}
-	return c.enqueue(msg, processAt)
+	return c.enqueue(msg, t)
 }

-func (c *Client) enqueue(msg *base.TaskMessage, processAt time.Time) error {
-	if time.Now().After(processAt) {
+// Enqueue enqueues task to be processed immediately.
+//
+// Enqueue returns nil 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.
+func (c *Client) Enqueue(task *Task, opts ...Option) error {
+	return c.EnqueueAt(time.Now(), task, opts...)
+}
+
+// EnqueueIn schedules task to be enqueued after the specified delay.
+//
+// EnqueueIn returns nil if the task is scheduled 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.
+func (c *Client) EnqueueIn(d time.Duration, task *Task, opts ...Option) error {
+	return c.EnqueueAt(time.Now().Add(d), task, opts...)
+}
+
+func (c *Client) enqueue(msg *base.TaskMessage, t time.Time) error {
+	if time.Now().After(t) {
 		return c.rdb.Enqueue(msg)
 	}
-	return c.rdb.Schedule(msg, processAt)
+	return c.rdb.Schedule(msg, t)
 }
--- a/client_test.go
+++ b/client_test.go
@@ -13,15 +13,23 @@ import (
 	"github.com/hibiken/asynq/internal/base"
 )

-func TestClient(t *testing.T) {
+func TestClientEnqueueAt(t *testing.T) {
 	r := setup(t)
-	client := NewClient(&RedisClientOpt{
-		Addr: "localhost:6379",
-		DB:   14,
+	client := NewClient(RedisClientOpt{
+		Addr: redisAddr,
+		DB:   redisDB,
 	})

 	task := NewTask("send_email", map[string]interface{}{"to": "customer@gmail.com", "from": "merchant@example.com"})

+	var (
+		now          = time.Now()
+		oneHourLater = now.Add(time.Hour)
+
+		noTimeout  = time.Duration(0).String()
+		noDeadline = time.Time{}.Format(time.RFC3339)
+	)
+
 	tests := []struct {
 		desc          string
 		task          *Task
@@ -33,16 +41,17 @@ func TestClient(t *testing.T) {
 		{
 			desc:      "Process task immediately",
 			task:      task,
-			processAt: time.Now(),
+			processAt: now,
 			opts:      []Option{},
 			wantEnqueued: map[string][]*base.TaskMessage{
 				"default": []*base.TaskMessage{
 					&base.TaskMessage{
-						Type:    task.Type,
-						Payload: task.Payload.data,
-						Retry:   defaultMaxRetry,
-						Queue:   "default",
-						Timeout: time.Duration(0).String(),
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    defaultMaxRetry,
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
 				},
 			},
@@ -51,149 +60,289 @@ func TestClient(t *testing.T) {
 		{
 			desc:         "Schedule task to be processed in the future",
 			task:         task,
-			processAt:    time.Now().Add(2 * time.Hour),
+			processAt:    oneHourLater,
 			opts:         []Option{},
 			wantEnqueued: nil, // db is flushed in setup so list does not exist hence nil
 			wantScheduled: []h.ZSetEntry{
 				{
 					Msg: &base.TaskMessage{
-						Type:    task.Type,
-						Payload: task.Payload.data,
-						Retry:   defaultMaxRetry,
-						Queue:   "default",
-						Timeout: time.Duration(0).String(),
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    defaultMaxRetry,
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
 					},
-					Score: float64(time.Now().Add(2 * time.Hour).Unix()),
+					Score: float64(oneHourLater.Unix()),
 				},
 			},
 		},
-		{
-			desc:      "Process task immediately with a custom retry count",
-			task:      task,
-			processAt: time.Now(),
-			opts: []Option{
-				MaxRetry(3),
-			},
-			wantEnqueued: map[string][]*base.TaskMessage{
-				"default": []*base.TaskMessage{
-					&base.TaskMessage{
-						Type:    task.Type,
-						Payload: task.Payload.data,
-						Retry:   3,
-						Queue:   "default",
-						Timeout: time.Duration(0).String(),
-					},
-				},
-			},
-			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
-		},
-		{
-			desc:      "Negative retry count",
-			task:      task,
-			processAt: time.Now(),
-			opts: []Option{
-				MaxRetry(-2),
-			},
-			wantEnqueued: map[string][]*base.TaskMessage{
-				"default": []*base.TaskMessage{
-					&base.TaskMessage{
-						Type:    task.Type,
-						Payload: task.Payload.data,
-						Retry:   0, // Retry count should be set to zero
-						Queue:   "default",
-						Timeout: time.Duration(0).String(),
-					},
-				},
-			},
-			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
-		},
-		{
-			desc:      "Conflicting options",
-			task:      task,
-			processAt: time.Now(),
-			opts: []Option{
-				MaxRetry(2),
-				MaxRetry(10),
-			},
-			wantEnqueued: map[string][]*base.TaskMessage{
-				"default": []*base.TaskMessage{
-					&base.TaskMessage{
-						Type:    task.Type,
-						Payload: task.Payload.data,
-						Retry:   10, // Last option takes precedence
-						Queue:   "default",
-						Timeout: time.Duration(0).String(),
-					},
-				},
-			},
-			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",
-						Timeout: time.Duration(0).String(),
-					},
-				},
-			},
-			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",
-						Timeout: time.Duration(0).String(),
-					},
-				},
-			},
-			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
-		},
-		{
-			desc:      "Timeout option sets the timeout duration",
-			task:      task,
-			processAt: time.Now(),
-			opts: []Option{
-				Timeout(20 * time.Second),
-			},
-			wantEnqueued: map[string][]*base.TaskMessage{
-				"default": []*base.TaskMessage{
-					&base.TaskMessage{
-						Type:    task.Type,
-						Payload: task.Payload.data,
-						Retry:   defaultMaxRetry,
-						Queue:   "default",
-						Timeout: (20 * time.Second).String(),
-					},
-				},
-			},
-			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
-		},
 	}

 	for _, tc := range tests {
 		h.FlushDB(t, r) // clean up db before each test case.

-		err := client.Schedule(tc.task, tc.processAt, tc.opts...)
+		err := client.EnqueueAt(tc.processAt, tc.task, tc.opts...)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		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)
+		if diff := cmp.Diff(tc.wantScheduled, gotScheduled, h.IgnoreIDOpt); diff != "" {
+			t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.ScheduledQueue, diff)
+		}
+	}
+}
+
+func TestClientEnqueue(t *testing.T) {
+	r := setup(t)
+	client := NewClient(RedisClientOpt{
+		Addr: redisAddr,
+		DB:   redisDB,
+	})
+
+	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
+		opts         []Option
+		wantEnqueued map[string][]*base.TaskMessage
+	}{
+		{
+			desc: "Process task immediately with a custom retry count",
+			task: task,
+			opts: []Option{
+				MaxRetry(3),
+			},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    3,
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
+					},
+				},
+			},
+		},
+		{
+			desc: "Negative retry count",
+			task: task,
+			opts: []Option{
+				MaxRetry(-2),
+			},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    0, // Retry count should be set to zero
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
+					},
+				},
+			},
+		},
+		{
+			desc: "Conflicting options",
+			task: task,
+			opts: []Option{
+				MaxRetry(2),
+				MaxRetry(10),
+			},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    10, // Last option takes precedence
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
+					},
+				},
+			},
+		},
+		{
+			desc: "With queue option",
+			task: task,
+			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",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
+					},
+				},
+			},
+		},
+		{
+			desc: "Queue option should be case-insensitive",
+			task: task,
+			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",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
+					},
+				},
+			},
+		},
+		{
+			desc: "With timeout option",
+			task: task,
+			opts: []Option{
+				Timeout(20 * time.Second),
+			},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						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),
+					},
+				},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r) // clean up db before each test case.
+
+		err := client.Enqueue(tc.task, tc.opts...)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		for qname, want := range tc.wantEnqueued {
+			got := h.GetEnqueuedMessages(t, r, qname)
+			if diff := cmp.Diff(want, got, h.IgnoreIDOpt); diff != "" {
+				t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.QueueKey(qname), diff)
+			}
+		}
+	}
+}
+
+func TestClientEnqueueIn(t *testing.T) {
+	r := setup(t)
+	client := NewClient(RedisClientOpt{
+		Addr: redisAddr,
+		DB:   redisDB,
+	})
+
+	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
+		delay         time.Duration
+		opts          []Option
+		wantEnqueued  map[string][]*base.TaskMessage
+		wantScheduled []h.ZSetEntry
+	}{
+		{
+			desc:         "schedule a task to be enqueued in one hour",
+			task:         task,
+			delay:        time.Hour,
+			opts:         []Option{},
+			wantEnqueued: nil, // db is flushed in setup so list does not exist hence nil
+			wantScheduled: []h.ZSetEntry{
+				{
+					Msg: &base.TaskMessage{
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    defaultMaxRetry,
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
+					},
+					Score: float64(time.Now().Add(time.Hour).Unix()),
+				},
+			},
+		},
+		{
+			desc:  "Zero delay",
+			task:  task,
+			delay: 0,
+			opts:  []Option{},
+			wantEnqueued: map[string][]*base.TaskMessage{
+				"default": []*base.TaskMessage{
+					&base.TaskMessage{
+						Type:     task.Type,
+						Payload:  task.Payload.data,
+						Retry:    defaultMaxRetry,
+						Queue:    "default",
+						Timeout:  noTimeout,
+						Deadline: noDeadline,
+					},
+				},
+			},
+			wantScheduled: nil, // db is flushed in setup so zset does not exist hence nil
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r) // clean up db before each test case.
+
+		err := client.EnqueueIn(tc.delay, tc.task, tc.opts...)
 		if err != nil {
 			t.Error(err)
 			continue
--- a/doc.go
+++ b/doc.go
@@ -9,8 +9,8 @@ Asynq uses Redis as a message broker. To connect to redis server,
 specify the options using one of RedisConnOpt types.

    redis = &asynq.RedisClientOpt{
-        Addr:     "localhost:6379",
-        Password: "secretpassword",
+        Addr:     "127.0.0.1:6379",
+        Password: "xxxxx",
        DB:       3,
    }

@@ -24,8 +24,11 @@ Task is created with two parameters: its type and payload.
        "send_email",
        map[string]interface{}{"user_id": 42})

-    // Schedule the task t to be processed a minute from now.
-    err := client.Schedule(t, time.Now().Add(time.Minute))
+    // Enqueue the task to be processed immediately.
+    err := client.Enqueue(t)
+
+    // Schedule the task to be processed in one minute.
+    err = client.EnqueueIn(time.Minute, t)

 The Background is used to run the background task processing with a given
 handler.
--- a/docs/assets/task-queue.png
+++ b/docs/assets/task-queue.png
--- a/go.mod
+++ b/go.mod
@@ -3,20 +3,12 @@ module github.com/hibiken/asynq
 go 1.13

 require (
-	github.com/go-redis/redis/v7 v7.0.0-beta.4
+	github.com/go-redis/redis/v7 v7.2.0
 	github.com/google/go-cmp v0.4.0
-	github.com/mitchellh/go-homedir v1.1.0
-	github.com/pelletier/go-toml v1.6.0 // indirect
 	github.com/rs/xid v1.2.1
-	github.com/spf13/afero v1.2.2 // indirect
 	github.com/spf13/cast v1.3.1
-	github.com/spf13/cobra v0.0.5
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/spf13/viper v1.6.0
 	go.uber.org/goleak v0.10.0
 	golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e // indirect
-	golang.org/x/text v0.3.2 // indirect
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
 	gopkg.in/yaml.v2 v2.2.7 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,178 +1,53 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
-github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
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-github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
-go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
-go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/goleak v0.10.0 h1:G3eWbSNIskeRqtsN/1uI5B+eP73y3JUuBsv9AZjehb4=
 go.uber.org/goleak v0.10.0/go.mod h1:VCZuO8V8mFPlL0F5J5GK1rtHV3DrFcQ1R8ryq7FK0aI=
-go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
-go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
-golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
-golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
-golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd h1:nTDtHvHSdCn1m6ITfMRqtOd/9+7a3s8RBNOZ3eYZzJA=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190522155817-f3200d17e092 h1:4QSRKanuywn15aTZvI/mIDEgPQpswuFndXpOj3rKEco=
 golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
-golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
+golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200202094626-16171245cfb2 h1:CCH4IOTTfewWjGOlSp+zGcjutRKlBEZQ6wTn8ozI/nI=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e h1:o3PsSEY8E4eXWkXrIP9YJALUkVZqzHJT5DOasTyn8Vs=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a h1:1n5lsVfiQW3yfsRGu98756EH1YthsFqr/5mxHduZW2A=
-golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e h1:9vRrk9YW2BTzLP0VCB9ZDjU4cPqkg+IDWL7XgxA1yxQ=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
@@ -181,34 +56,19 @@ golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
-golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
-gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
 gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/heartbeat.go
+++ b/heartbeat.go
@@ -5,6 +5,7 @@
 package asynq

 import (
+	"sync"
 	"time"

 	"github.com/hibiken/asynq/internal/base"
@@ -14,9 +15,10 @@ import (
 // heartbeater is responsible for writing process info to redis periodically to
 // indicate that the background worker process is up.
 type heartbeater struct {
-	rdb *rdb.RDB
+	logger Logger
+	rdb    *rdb.RDB

-	pinfo *base.ProcessInfo
+	ps *base.ProcessState

 	// channel to communicate back to the long running "heartbeater" goroutine.
 	done chan struct{}
@@ -25,30 +27,34 @@ type heartbeater struct {
 	interval time.Duration
 }

-func newHeartbeater(rdb *rdb.RDB, pinfo *base.ProcessInfo, interval time.Duration) *heartbeater {
+func newHeartbeater(l Logger, rdb *rdb.RDB, ps *base.ProcessState, interval time.Duration) *heartbeater {
 	return &heartbeater{
+		logger:   l,
 		rdb:      rdb,
-		pinfo:    pinfo,
+		ps:       ps,
 		done:     make(chan struct{}),
 		interval: interval,
 	}
 }

 func (h *heartbeater) terminate() {
-	logger.info("Heartbeater shutting down...")
+	h.logger.Info("Heartbeater shutting down...")
 	// Signal the heartbeater goroutine to stop.
 	h.done <- struct{}{}
 }

-func (h *heartbeater) start() {
-	h.pinfo.SetStarted(time.Now())
-	h.pinfo.SetState("running")
+func (h *heartbeater) start(wg *sync.WaitGroup) {
+	h.ps.SetStarted(time.Now())
+	h.ps.SetStatus(base.StatusRunning)
+	wg.Add(1)
 	go func() {
+		defer wg.Done()
 		h.beat()
 		for {
 			select {
 			case <-h.done:
-				logger.info("Heartbeater done")
+				h.rdb.ClearProcessState(h.ps)
+				h.logger.Info("Heartbeater done")
 				return
 			case <-time.After(h.interval):
 				h.beat()
@@ -60,8 +66,8 @@ func (h *heartbeater) start() {
 func (h *heartbeater) beat() {
 	// Note: Set TTL to be long enough so that it won't expire before we write again
 	// and short enough to expire quickly once the process is shut down or killed.
-	err := h.rdb.WriteProcessInfo(h.pinfo, h.interval*2)
+	err := h.rdb.WriteProcessState(h.ps, h.interval*2)
 	if err != nil {
-		logger.error("could not write heartbeat data: %v", err)
+		h.logger.Error("could not write heartbeat data: %v", err)
 	}
 }
--- a/heartbeat_test.go
+++ b/heartbeat_test.go
@@ -5,6 +5,7 @@
 package asynq

 import (
+	"sync"
 	"testing"
 	"time"

@@ -26,7 +27,7 @@ func TestHeartbeater(t *testing.T) {
 		queues      map[string]int
 		concurrency int
 	}{
-		{time.Second, "some.address.ec2.aws.com", 45678, map[string]int{"default": 1}, 10},
+		{time.Second, "localhost", 45678, map[string]int{"default": 1}, 10},
 	}

 	timeCmpOpt := cmpopts.EquateApproxTime(10 * time.Millisecond)
@@ -34,8 +35,11 @@ func TestHeartbeater(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r)

-		pi := base.NewProcessInfo(tc.host, tc.pid, tc.concurrency, tc.queues, false)
-		hb := newHeartbeater(rdbClient, pi, tc.interval)
+		state := base.NewProcessState(tc.host, tc.pid, tc.concurrency, tc.queues, false)
+		hb := newHeartbeater(testLogger, rdbClient, state, tc.interval)
+
+		var wg sync.WaitGroup
+		hb.start(&wg)

 		want := &base.ProcessInfo{
 			Host:        tc.host,
@@ -43,42 +47,53 @@ func TestHeartbeater(t *testing.T) {
 			Queues:      tc.queues,
 			Concurrency: tc.concurrency,
 			Started:     time.Now(),
-			State:       "running",
+			Status:      "running",
 		}
-		hb.start()

 		// allow for heartbeater to write to redis
 		time.Sleep(tc.interval * 2)

-		got, err := rdbClient.ReadProcessInfo(tc.host, tc.pid)
+		ps, err := rdbClient.ListProcesses()
 		if err != nil {
 			t.Errorf("could not read process status from redis: %v", err)
 			hb.terminate()
 			continue
 		}

-		if diff := cmp.Diff(want, got, timeCmpOpt, ignoreOpt); diff != "" {
-			t.Errorf("redis stored process status %+v, want %+v; (-want, +got)\n%s", got, want, diff)
+		if len(ps) != 1 {
+			t.Errorf("(*RDB).ListProcesses returned %d process info, want 1", len(ps))
 			hb.terminate()
 			continue
 		}

-		// state change
-		pi.SetState("stopped")
+		if diff := cmp.Diff(want, ps[0], timeCmpOpt, ignoreOpt); diff != "" {
+			t.Errorf("redis stored process status %+v, want %+v; (-want, +got)\n%s", ps[0], want, diff)
+			hb.terminate()
+			continue
+		}
+
+		// status change
+		state.SetStatus(base.StatusStopped)

 		// allow for heartbeater to write to redis
 		time.Sleep(tc.interval * 2)

-		want.State = "stopped"
-		got, err = rdbClient.ReadProcessInfo(tc.host, tc.pid)
+		want.Status = "stopped"
+		ps, err = rdbClient.ListProcesses()
 		if err != nil {
 			t.Errorf("could not read process status from redis: %v", err)
 			hb.terminate()
 			continue
 		}

-		if diff := cmp.Diff(want, got, timeCmpOpt, ignoreOpt); diff != "" {
-			t.Errorf("redis stored process status %+v, want %+v; (-want, +got)\n%s", got, want, diff)
+		if len(ps) != 1 {
+			t.Errorf("(*RDB).ListProcesses returned %d process info, want 1", len(ps))
+			hb.terminate()
+			continue
+		}
+
+		if diff := cmp.Diff(want, ps[0], timeCmpOpt, ignoreOpt); diff != "" {
+			t.Errorf("redis stored process status %+v, want %+v; (-want, +got)\n%s", ps[0], want, diff)
 			hb.terminate()
 			continue
 		}
--- a/internal/asynqtest/asynqtest.go
+++ b/internal/asynqtest/asynqtest.go
@@ -53,6 +53,22 @@ var SortProcessInfoOpt = cmp.Transformer("SortProcessInfo", func(in []*base.Proc
 	return out
 })

+// SortWorkerInfoOpt is a cmp.Option to sort base.WorkerInfo for comparing slice of worker info.
+var SortWorkerInfoOpt = cmp.Transformer("SortWorkerInfo", func(in []*base.WorkerInfo) []*base.WorkerInfo {
+	out := append([]*base.WorkerInfo(nil), in...) // Copy input to avoid mutating it
+	sort.Slice(out, func(i, j int) bool {
+		return out[i].ID.String() < out[j].ID.String()
+	})
+	return out
+})
+
+// SortStringSliceOpt is a cmp.Option to sort string slice.
+var SortStringSliceOpt = cmp.Transformer("SortStringSlice", func(in []string) []string {
+	out := append([]string(nil), in...)
+	sort.Strings(out)
+	return out
+})
+
 // IgnoreIDOpt is an cmp.Option to ignore ID field in task messages when comparing.
 var IgnoreIDOpt = cmpopts.IgnoreFields(base.TaskMessage{}, "ID")

--- a/internal/base/base.go
+++ b/internal/base/base.go
@@ -20,8 +20,10 @@ const DefaultQueueName = "default"

 // Redis keys
 const (
-	psPrefix        = "asynq:ps:"                    // HASH
 	AllProcesses    = "asynq:ps"                     // ZSET
+	psPrefix        = "asynq:ps:"                    // STRING - asynq:ps:<host>:<pid>
+	AllWorkers      = "asynq:workers"                // ZSET
+	workersPrefix   = "asynq:workers:"               // HASH   - asynq:workers:<host:<pid>
 	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>
@@ -34,28 +36,31 @@ const (
 	CancelChannel   = "asynq:cancel"                 // PubSub channel
 )

-// QueueKey returns a redis key string for the given queue name.
+// QueueKey returns a redis key for the given queue name.
 func QueueKey(qname string) string {
 	return QueuePrefix + strings.ToLower(qname)
 }

-// ProcessedKey returns a redis key string for processed count
-// for the given day.
+// ProcessedKey returns a redis key for processed count for the given day.
 func ProcessedKey(t time.Time) string {
 	return processedPrefix + t.UTC().Format("2006-01-02")
 }

-// FailureKey returns a redis key string for failure count
-// for the given day.
+// FailureKey returns a redis key for failure count for the given day.
 func FailureKey(t time.Time) string {
 	return failurePrefix + t.UTC().Format("2006-01-02")
 }

-// ProcessInfoKey returns a redis key string for process info.
+// ProcessInfoKey returns a redis key for process info.
 func ProcessInfoKey(hostname string, pid int) string {
 	return fmt.Sprintf("%s%s:%d", psPrefix, hostname, pid)
 }

+// WorkersKey returns a redis key for the workers given hostname and pid.
+func WorkersKey(hostname string, pid int) string {
+	return fmt.Sprintf("%s%s:%d", workersPrefix, hostname, pid)
+}
+
 // TaskMessage is the internal representation of a task with additional metadata fields.
 // Serialized data of this type gets written to redis.
 type TaskMessage struct {
@@ -85,56 +90,180 @@ 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
 }

-// ProcessInfo holds information about running background worker process.
+// ProcessState holds process level information.
+//
+// ProcessStates are safe for concurrent use by multiple goroutines.
+type ProcessState struct {
+	mu             sync.Mutex // guards all data fields
+	concurrency    int
+	queues         map[string]int
+	strictPriority bool
+	pid            int
+	host           string
+	status         PStatus
+	started        time.Time
+	workers        map[string]*workerStats
+}
+
+// PStatus represents status of a process.
+type PStatus int
+
+const (
+	// StatusIdle indicates process is in idle state.
+	StatusIdle PStatus = iota
+
+	// StatusRunning indicates process is up and processing tasks.
+	StatusRunning
+
+	// StatusStopped indicates process is up but not processing new tasks.
+	StatusStopped
+)
+
+var statuses = []string{
+	"idle",
+	"running",
+	"stopped",
+}
+
+func (s PStatus) String() string {
+	if StatusIdle <= s && s <= StatusStopped {
+		return statuses[s]
+	}
+	return "unknown status"
+}
+
+type workerStats struct {
+	msg     *TaskMessage
+	started time.Time
+}
+
+// NewProcessState returns a new instance of ProcessState.
+func NewProcessState(host string, pid, concurrency int, queues map[string]int, strict bool) *ProcessState {
+	return &ProcessState{
+		host:           host,
+		pid:            pid,
+		concurrency:    concurrency,
+		queues:         cloneQueueConfig(queues),
+		strictPriority: strict,
+		status:         StatusIdle,
+		workers:        make(map[string]*workerStats),
+	}
+}
+
+// SetStatus updates the state of process.
+func (ps *ProcessState) SetStatus(status PStatus) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	ps.status = status
+}
+
+// SetStarted records when the process started processing.
+func (ps *ProcessState) SetStarted(t time.Time) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	ps.started = t
+}
+
+// AddWorkerStats records when a worker started and which task it's processing.
+func (ps *ProcessState) AddWorkerStats(msg *TaskMessage, started time.Time) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	ps.workers[msg.ID.String()] = &workerStats{msg, started}
+}
+
+// DeleteWorkerStats removes a worker's entry from the process state.
+func (ps *ProcessState) DeleteWorkerStats(msg *TaskMessage) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	delete(ps.workers, msg.ID.String())
+}
+
+// Get returns current state of process as a ProcessInfo.
+func (ps *ProcessState) Get() *ProcessInfo {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	return &ProcessInfo{
+		Host:              ps.host,
+		PID:               ps.pid,
+		Concurrency:       ps.concurrency,
+		Queues:            cloneQueueConfig(ps.queues),
+		StrictPriority:    ps.strictPriority,
+		Status:            ps.status.String(),
+		Started:           ps.started,
+		ActiveWorkerCount: len(ps.workers),
+	}
+}
+
+// GetWorkers returns a list of currently running workers' info.
+func (ps *ProcessState) GetWorkers() []*WorkerInfo {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	var res []*WorkerInfo
+	for _, w := range ps.workers {
+		res = append(res, &WorkerInfo{
+			Host:    ps.host,
+			PID:     ps.pid,
+			ID:      w.msg.ID,
+			Type:    w.msg.Type,
+			Queue:   w.msg.Queue,
+			Payload: clonePayload(w.msg.Payload),
+			Started: w.started,
+		})
+	}
+	return res
+}
+
+func cloneQueueConfig(qcfg map[string]int) map[string]int {
+	res := make(map[string]int)
+	for qname, n := range qcfg {
+		res[qname] = n
+	}
+	return res
+}
+
+func clonePayload(payload map[string]interface{}) map[string]interface{} {
+	res := make(map[string]interface{})
+	for k, v := range payload {
+		res[k] = v
+	}
+	return res
+}
+
+// ProcessInfo holds information about a running background worker process.
 type ProcessInfo struct {
-	mu                sync.Mutex
+	Host              string
+	PID               int
 	Concurrency       int
 	Queues            map[string]int
 	StrictPriority    bool
-	PID               int
-	Host              string
-	State             string
+	Status            string
 	Started           time.Time
 	ActiveWorkerCount int
 }

-// NewProcessInfo returns a new instance of ProcessInfo.
-func NewProcessInfo(host string, pid, concurrency int, queues map[string]int, strict bool) *ProcessInfo {
-	return &ProcessInfo{
-		Host:           host,
-		PID:            pid,
-		Concurrency:    concurrency,
-		Queues:         queues,
-		StrictPriority: strict,
-	}
-}
-
-// SetState set the state field of the process info.
-func (p *ProcessInfo) SetState(state string) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	p.State = state
-}
-
-// SetStarted set the started field of the process info.
-func (p *ProcessInfo) SetStarted(t time.Time) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	p.Started = t
-}
-
-// IncrActiveWorkerCount increments active worker count by delta.
-func (p *ProcessInfo) IncrActiveWorkerCount(delta int) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	p.ActiveWorkerCount += delta
+// WorkerInfo holds information about a running worker.
+type WorkerInfo struct {
+	Host    string
+	PID     int
+	ID      xid.ID
+	Type    string
+	Queue   string
+	Payload map[string]interface{}
+	Started time.Time
 }

 // Cancelations is a collection that holds cancel functions for all in-progress tasks.
 //
-// Its methods are safe to be used in multiple goroutines.
+// Cancelations are safe for concurrent use by multipel goroutines.
 type Cancelations struct {
 	mu          sync.Mutex
 	cancelFuncs map[string]context.CancelFunc
@@ -162,10 +291,11 @@ func (c *Cancelations) Delete(id string) {
 }

 // Get returns a cancel func given an id.
-func (c *Cancelations) Get(id string) context.CancelFunc {
+func (c *Cancelations) Get(id string) (fn context.CancelFunc, ok bool) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
-	return c.cancelFuncs[id]
+	fn, ok = c.cancelFuncs[id]
+	return fn, ok
 }

 // GetAll returns all cancel funcs.
--- a/internal/base/base_test.go
+++ b/internal/base/base_test.go
@@ -5,9 +5,14 @@
 package base

 import (
+	"context"
+	"math/rand"
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/rs/xid"
 )

 func TestQueueKey(t *testing.T) {
@@ -75,34 +80,137 @@ func TestProcessInfoKey(t *testing.T) {
 	for _, tc := range tests {
 		got := ProcessInfoKey(tc.hostname, tc.pid)
 		if got != tc.want {
-			t.Errorf("ProcessInfoKey(%s, %d) = %s, want %s", tc.hostname, tc.pid, got, tc.want)
+			t.Errorf("ProcessInfoKey(%q, %d) = %q, want %q", tc.hostname, tc.pid, got, tc.want)
 		}
 	}
 }

-// Note: Run this test with -race flag to check for data race.
-func TestProcessInfoSetter(t *testing.T) {
-	pi := NewProcessInfo("localhost", 1234, 8, map[string]int{"default": 1}, false)
+func TestWorkersKey(t *testing.T) {
+	tests := []struct {
+		hostname string
+		pid      int
+		want     string
+	}{
+		{"localhost", 9876, "asynq:workers:localhost:9876"},
+		{"127.0.0.1", 1234, "asynq:workers:127.0.0.1:1234"},
+	}

+	for _, tc := range tests {
+		got := WorkersKey(tc.hostname, tc.pid)
+		if got != tc.want {
+			t.Errorf("WorkersKey(%q, %d) = %q, want = %q", tc.hostname, tc.pid, got, tc.want)
+		}
+	}
+}
+
+// Test for process state being accessed by multiple goroutines.
+// Run with -race flag to check for data race.
+func TestProcessStateConcurrentAccess(t *testing.T) {
+	ps := NewProcessState("127.0.0.1", 1234, 10, map[string]int{"default": 1}, false)
 	var wg sync.WaitGroup
+	started := time.Now()
+	msgs := []*TaskMessage{
+		&TaskMessage{ID: xid.New(), Type: "type1", Payload: map[string]interface{}{"user_id": 42}},
+		&TaskMessage{ID: xid.New(), Type: "type2"},
+		&TaskMessage{ID: xid.New(), Type: "type3"},
+	}

-	wg.Add(3)
-
+	// Simulate hearbeater calling SetStatus and SetStarted.
+	wg.Add(1)
 	go func() {
-		pi.SetState("runnning")
-		wg.Done()
+		defer wg.Done()
+		ps.SetStarted(started)
+		ps.SetStatus(StatusRunning)
 	}()

-	go func() {
-		pi.SetStarted(time.Now())
-		pi.IncrActiveWorkerCount(1)
-		wg.Done()
-	}()
+	// Simulate processor starting worker goroutines.
+	for _, msg := range msgs {
+		wg.Add(1)
+		ps.AddWorkerStats(msg, time.Now())
+		go func(msg *TaskMessage) {
+			defer wg.Done()
+			time.Sleep(time.Duration(rand.Intn(500)) * time.Millisecond)
+			ps.DeleteWorkerStats(msg)
+		}(msg)
+	}

+	// Simulate hearbeater calling Get and GetWorkers
+	wg.Add(1)
 	go func() {
-		pi.SetState("stopped")
 		wg.Done()
+		for i := 0; i < 5; i++ {
+			ps.Get()
+			ps.GetWorkers()
+			time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
+		}
 	}()

 	wg.Wait()
+
+	want := &ProcessInfo{
+		Host:              "127.0.0.1",
+		PID:               1234,
+		Concurrency:       10,
+		Queues:            map[string]int{"default": 1},
+		StrictPriority:    false,
+		Status:            "running",
+		Started:           started,
+		ActiveWorkerCount: 0,
+	}
+
+	got := ps.Get()
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("(*ProcessState).Get() = %+v, want %+v; (-want,+got)\n%s",
+			got, want, diff)
+	}
+}
+
+// Test for cancelations being accessed by multiple goroutines.
+// Run with -race flag to check for data race.
+func TestCancelationsConcurrentAccess(t *testing.T) {
+	c := NewCancelations()
+
+	_, cancel1 := context.WithCancel(context.Background())
+	_, cancel2 := context.WithCancel(context.Background())
+	_, cancel3 := context.WithCancel(context.Background())
+	var key1, key2, key3 = "key1", "key2", "key3"
+
+	var wg sync.WaitGroup
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		c.Add(key1, cancel1)
+	}()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		c.Add(key2, cancel2)
+		time.Sleep(200 * time.Millisecond)
+		c.Delete(key2)
+	}()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		c.Add(key3, cancel3)
+	}()
+
+	wg.Wait()
+
+	_, ok := c.Get(key1)
+	if !ok {
+		t.Errorf("(*Cancelations).Get(%q) = _, false, want <function>, true", key1)
+	}
+
+	_, ok = c.Get(key2)
+	if ok {
+		t.Errorf("(*Cancelations).Get(%q) = _, true, want <nil>, false", key2)
+	}
+
+	funcs := c.GetAll()
+	if len(funcs) != 2 {
+		t.Errorf("(*Cancelations).GetAll() returns %d functions, want 2", len(funcs))
+	}
 }
--- a/internal/log/log.go
+++ b/internal/log/log.go
@@ -0,0 +1,48 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+// Package log exports logging related types and functions.
+package log
+
+import (
+	"io"
+	stdlog "log"
+	"os"
+)
+
+func NewLogger(out io.Writer) *Logger {
+	return &Logger{
+		stdlog.New(out, "", stdlog.Ldate|stdlog.Ltime|stdlog.Lmicroseconds|stdlog.LUTC),
+	}
+}
+
+type Logger struct {
+	*stdlog.Logger
+}
+
+func (l *Logger) Debug(format string, args ...interface{}) {
+	format = "DEBUG: " + format
+	l.Printf(format, args...)
+}
+
+func (l *Logger) Info(format string, args ...interface{}) {
+	format = "INFO: " + format
+	l.Printf(format, args...)
+}
+
+func (l *Logger) Warn(format string, args ...interface{}) {
+	format = "WARN: " + format
+	l.Printf(format, args...)
+}
+
+func (l *Logger) Error(format string, args ...interface{}) {
+	format = "ERROR: " + format
+	l.Printf(format, args...)
+}
+
+func (l *Logger) Fatal(format string, args ...interface{}) {
+	format = "FATAL: " + format
+	l.Printf(format, args...)
+	os.Exit(1)
+}
--- a/internal/log/log_test.go
+++ b/internal/log/log_test.go
@@ -1,4 +1,8 @@
-package asynq
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package log

 import (
 	"bytes"
@@ -20,6 +24,38 @@ type tester struct {
 	wantPattern string // regexp that log output must match
 }

+func TestLoggerDebug(t *testing.T) {
+	tests := []tester{
+		{
+			desc:        "without trailing newline, logger adds newline",
+			message:     "hello, world!",
+			wantPattern: fmt.Sprintf("^%s %s%s DEBUG: hello, world!\n$", rgxdate, rgxtime, rgxmicroseconds),
+		},
+		{
+			desc:        "with trailing newline, logger preserves newline",
+			message:     "hello, world!\n",
+			wantPattern: fmt.Sprintf("^%s %s%s DEBUG: hello, world!\n$", rgxdate, rgxtime, rgxmicroseconds),
+		},
+	}
+
+	for _, tc := range tests {
+		var buf bytes.Buffer
+		logger := NewLogger(&buf)
+
+		logger.Debug(tc.message)
+
+		got := buf.String()
+		matched, err := regexp.MatchString(tc.wantPattern, got)
+		if err != nil {
+			t.Fatal("pattern did not compile:", err)
+		}
+		if !matched {
+			t.Errorf("logger.info(%q) outputted %q, should match pattern %q",
+				tc.message, got, tc.wantPattern)
+		}
+	}
+}
+
 func TestLoggerInfo(t *testing.T) {
 	tests := []tester{
 		{
@@ -36,9 +72,9 @@ func TestLoggerInfo(t *testing.T) {

 	for _, tc := range tests {
 		var buf bytes.Buffer
-		logger := newLogger(&buf)
+		logger := NewLogger(&buf)

-		logger.info(tc.message)
+		logger.Info(tc.message)

 		got := buf.String()
 		matched, err := regexp.MatchString(tc.wantPattern, got)
@@ -68,9 +104,9 @@ func TestLoggerWarn(t *testing.T) {

 	for _, tc := range tests {
 		var buf bytes.Buffer
-		logger := newLogger(&buf)
+		logger := NewLogger(&buf)

-		logger.warn(tc.message)
+		logger.Warn(tc.message)

 		got := buf.String()
 		matched, err := regexp.MatchString(tc.wantPattern, got)
@@ -100,9 +136,9 @@ func TestLoggerError(t *testing.T) {

 	for _, tc := range tests {
 		var buf bytes.Buffer
-		logger := newLogger(&buf)
+		logger := NewLogger(&buf)

-		logger.error(tc.message)
+		logger.Error(tc.message)

 		got := buf.String()
 		matched, err := regexp.MatchString(tc.wantPattern, got)
--- a/internal/rdb/inspect.go
+++ b/internal/rdb/inspect.go
@@ -794,3 +794,39 @@ func (r *RDB) ListProcesses() ([]*base.ProcessInfo, error) {
 	}
 	return processes, nil
 }
+
+// Note: Script also removes stale keys.
+var listWorkersCmd = redis.NewScript(`
+local res = {}
+local now = tonumber(ARGV[1])
+local keys = redis.call("ZRANGEBYSCORE", KEYS[1], now, "+inf")
+for _, key in ipairs(keys) do
+	local workers = redis.call("HVALS", key)
+	for _, w in ipairs(workers) do
+		table.insert(res, w)
+	end  
+end
+redis.call("ZREMRANGEBYSCORE", KEYS[1], "-inf", now-1)
+return res`)
+
+// ListWorkers returns the list of worker stats.
+func (r *RDB) ListWorkers() ([]*base.WorkerInfo, error) {
+	res, err := listWorkersCmd.Run(r.client, []string{base.AllWorkers}, time.Now().UTC().Unix()).Result()
+	if err != nil {
+		return nil, err
+	}
+	data, err := cast.ToStringSliceE(res)
+	if err != nil {
+		return nil, err
+	}
+	var workers []*base.WorkerInfo
+	for _, s := range data {
+		var w base.WorkerInfo
+		err := json.Unmarshal([]byte(s), &w)
+		if err != nil {
+			continue // skip bad data
+		}
+		workers = append(workers, &w)
+	}
+	return workers, nil
+}
--- a/internal/rdb/inspect_test.go
+++ b/internal/rdb/inspect_test.go
@@ -2054,32 +2054,51 @@ func TestRemoveQueueError(t *testing.T) {
 func TestListProcesses(t *testing.T) {
 	r := setup(t)

-	ps1 := &base.ProcessInfo{
+	started1 := time.Now().Add(-time.Hour)
+	ps1 := base.NewProcessState("do.droplet1", 1234, 10, map[string]int{"default": 1}, false)
+	ps1.SetStarted(started1)
+	ps1.SetStatus(base.StatusRunning)
+	info1 := &base.ProcessInfo{
 		Concurrency:       10,
 		Queues:            map[string]int{"default": 1},
 		Host:              "do.droplet1",
 		PID:               1234,
-		State:             "running",
-		Started:           time.Now().Add(-time.Hour),
-		ActiveWorkerCount: 5,
+		Status:            "running",
+		Started:           started1,
+		ActiveWorkerCount: 0,
 	}

-	ps2 := &base.ProcessInfo{
+	started2 := time.Now().Add(-2 * time.Hour)
+	ps2 := base.NewProcessState("do.droplet2", 9876, 20, map[string]int{"email": 1}, false)
+	ps2.SetStarted(started2)
+	ps2.SetStatus(base.StatusStopped)
+	ps2.AddWorkerStats(h.NewTaskMessage("send_email", nil), time.Now())
+	info2 := &base.ProcessInfo{
 		Concurrency:       20,
 		Queues:            map[string]int{"email": 1},
 		Host:              "do.droplet2",
 		PID:               9876,
-		State:             "stopped",
-		Started:           time.Now().Add(-2 * time.Hour),
-		ActiveWorkerCount: 20,
+		Status:            "stopped",
+		Started:           started2,
+		ActiveWorkerCount: 1,
 	}

 	tests := []struct {
-		processes []*base.ProcessInfo
+		processes []*base.ProcessState
+		want      []*base.ProcessInfo
 	}{
-		{processes: []*base.ProcessInfo{}},
-		{processes: []*base.ProcessInfo{ps1}},
-		{processes: []*base.ProcessInfo{ps1, ps2}},
+		{
+			processes: []*base.ProcessState{},
+			want:      []*base.ProcessInfo{},
+		},
+		{
+			processes: []*base.ProcessState{ps1},
+			want:      []*base.ProcessInfo{info1},
+		},
+		{
+			processes: []*base.ProcessState{ps1, ps2},
+			want:      []*base.ProcessInfo{info1, info2},
+		},
 	}

 	ignoreOpt := cmpopts.IgnoreUnexported(base.ProcessInfo{})
@@ -2088,7 +2107,7 @@ func TestListProcesses(t *testing.T) {
 		h.FlushDB(t, r.client)

 		for _, ps := range tc.processes {
-			if err := r.WriteProcessInfo(ps, 5*time.Second); err != nil {
+			if err := r.WriteProcessState(ps, 5*time.Second); err != nil {
 				t.Fatal(err)
 			}
 		}
@@ -2097,9 +2116,74 @@ func TestListProcesses(t *testing.T) {
 		if err != nil {
 			t.Errorf("r.ListProcesses returned an error: %v", err)
 		}
-		if diff := cmp.Diff(tc.processes, got, h.SortProcessInfoOpt, ignoreOpt); diff != "" {
+		if diff := cmp.Diff(tc.want, got, h.SortProcessInfoOpt, ignoreOpt); diff != "" {
 			t.Errorf("r.ListProcesses returned %v, want %v; (-want,+got)\n%s",
 				got, tc.processes, diff)
 		}
 	}
 }
+
+func TestListWorkers(t *testing.T) {
+	r := setup(t)
+
+	const (
+		host = "127.0.0.1"
+		pid  = 4567
+	)
+
+	m1 := h.NewTaskMessage("send_email", map[string]interface{}{"user_id": "abc123"})
+	m2 := h.NewTaskMessage("gen_thumbnail", map[string]interface{}{"path": "some/path/to/image/file"})
+	m3 := h.NewTaskMessage("reindex", map[string]interface{}{})
+	t1 := time.Now().Add(-time.Second)
+	t2 := time.Now().Add(-10 * time.Second)
+	t3 := time.Now().Add(-time.Minute)
+
+	type workerStats struct {
+		msg     *base.TaskMessage
+		started time.Time
+	}
+
+	tests := []struct {
+		workers []*workerStats
+		want    []*base.WorkerInfo
+	}{
+		{
+			workers: []*workerStats{
+				{m1, t1},
+				{m2, t2},
+				{m3, t3},
+			},
+			want: []*base.WorkerInfo{
+				{Host: host, PID: pid, ID: m1.ID, Type: m1.Type, Queue: m1.Queue, Payload: m1.Payload, Started: t1},
+				{Host: host, PID: pid, ID: m2.ID, Type: m2.Type, Queue: m2.Queue, Payload: m2.Payload, Started: t2},
+				{Host: host, PID: pid, ID: m3.ID, Type: m3.Type, Queue: m3.Queue, Payload: m3.Payload, Started: t3},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r.client)
+
+		ps := base.NewProcessState(host, pid, 10, map[string]int{"default": 1}, false)
+
+		for _, w := range tc.workers {
+			ps.AddWorkerStats(w.msg, w.started)
+		}
+
+		err := r.WriteProcessState(ps, time.Minute)
+		if err != nil {
+			t.Errorf("could not write process state to redis: %v", err)
+			continue
+		}
+
+		got, err := r.ListWorkers()
+		if err != nil {
+			t.Errorf("(*RDB).ListWorkers() returned an error: %v", err)
+			continue
+		}
+
+		if diff := cmp.Diff(tc.want, got, h.SortWorkerInfoOpt); diff != "" {
+			t.Errorf("(*RDB).ListWorkers() = %v, want = %v; (-want,+got)\n%s", got, tc.want, diff)
+		}
+	}
+}
--- a/internal/rdb/rdb.go
+++ b/internal/rdb/rdb.go
@@ -67,7 +67,6 @@ func (r *RDB) Dequeue(qnames ...string) (*base.TaskMessage, error) {
 	if len(qnames) == 1 {
 		data, err = r.dequeueSingle(base.QueueKey(qnames[0]))
 	} else {
-		// TODO(hibiken): Take keys are argument and don't compute every time
 		var keys []string
 		for _, q := range qnames {
 			keys = append(keys, base.QueueKey(q))
@@ -359,56 +358,71 @@ func (r *RDB) forwardSingle(src, dst string) error {
 		[]string{src, dst}, now).Err()
 }

-// KEYS[1] -> asynq:ps
-// KEYS[2] -> asynq:ps:<host:pid>
-// ARGV[1] -> expiration time
-// ARGV[2] -> TTL in seconds
-// ARGV[3] -> process info
+// KEYS[1]  -> asynq:ps:<host:pid>
+// KEYS[2]  -> asynq:ps
+// KEYS[3]  -> asynq:workers<host:pid>
+// keys[4]  -> asynq:workers
+// ARGV[1]  -> expiration time
+// ARGV[2]  -> TTL in seconds
+// ARGV[3]  -> process info
+// ARGV[4:] -> alternate key-value pair of (worker id, worker data)
+// Note: Add key to ZSET with expiration time as score.
+// ref: https://github.com/antirez/redis/issues/135#issuecomment-2361996
 var writeProcessInfoCmd = redis.NewScript(`
-redis.call("ZADD", KEYS[1], ARGV[1], KEYS[2])
-redis.call("SETEX", KEYS[2], ARGV[2], ARGV[3])
+redis.call("SETEX", KEYS[1], ARGV[2], ARGV[3])
+redis.call("ZADD", KEYS[2], ARGV[1], KEYS[1])
+redis.call("DEL", KEYS[3])
+for i = 4, table.getn(ARGV)-1, 2 do
+	redis.call("HSET", KEYS[3], ARGV[i], ARGV[i+1])
+end
+redis.call("EXPIRE", KEYS[3], ARGV[2])
+redis.call("ZADD", KEYS[4], ARGV[1], KEYS[3])
 return redis.status_reply("OK")`)

-// WriteProcessInfo writes process information to redis with expiration
-// set to the value ttl.
-func (r *RDB) WriteProcessInfo(ps *base.ProcessInfo, ttl time.Duration) error {
-	bytes, err := json.Marshal(ps)
+// WriteProcessState writes process state data to redis with expiration  set to the value ttl.
+func (r *RDB) WriteProcessState(ps *base.ProcessState, ttl time.Duration) error {
+	info := ps.Get()
+	bytes, err := json.Marshal(info)
 	if err != nil {
 		return err
 	}
-	// Note: Add key to ZSET with expiration time as score.
-	// ref: https://github.com/antirez/redis/issues/135#issuecomment-2361996
+	var args []interface{} // args to the lua script
 	exp := time.Now().Add(ttl).UTC()
-	key := base.ProcessInfoKey(ps.Host, ps.PID)
-	return writeProcessInfoCmd.Run(r.client, []string{base.AllProcesses, key}, float64(exp.Unix()), ttl.Seconds(), string(bytes)).Err()
-}
-
-// ReadProcessInfo reads process information stored in redis.
-func (r *RDB) ReadProcessInfo(host string, pid int) (*base.ProcessInfo, error) {
-	key := base.ProcessInfoKey(host, pid)
-	data, err := r.client.Get(key).Result()
-	if err != nil {
-		return nil, err
+	workers := ps.GetWorkers()
+	args = append(args, float64(exp.Unix()), ttl.Seconds(), bytes)
+	for _, w := range workers {
+		bytes, err := json.Marshal(w)
+		if err != nil {
+			continue // skip bad data
+		}
+		args = append(args, w.ID.String(), bytes)
 	}
-	var pinfo base.ProcessInfo
-	err = json.Unmarshal([]byte(data), &pinfo)
-	if err != nil {
-		return nil, err
-	}
-	return &pinfo, nil
+	pkey := base.ProcessInfoKey(info.Host, info.PID)
+	wkey := base.WorkersKey(info.Host, info.PID)
+	return writeProcessInfoCmd.Run(r.client,
+		[]string{pkey, base.AllProcesses, wkey, base.AllWorkers},
+		args...).Err()
 }

 // KEYS[1] -> asynq:ps
 // KEYS[2] -> asynq:ps:<host:pid>
+// KEYS[3] -> asynq:workers
+// KEYS[4] -> asynq:workers<host:pid>
 var clearProcessInfoCmd = redis.NewScript(`
 redis.call("ZREM", KEYS[1], KEYS[2])
 redis.call("DEL", KEYS[2])
+redis.call("ZREM", KEYS[3], KEYS[4])
+redis.call("DEL", KEYS[4])
 return redis.status_reply("OK")`)

-// ClearProcessInfo deletes process information from redis.
-func (r *RDB) ClearProcessInfo(ps *base.ProcessInfo) error {
-	key := base.ProcessInfoKey(ps.Host, ps.PID)
-	return clearProcessInfoCmd.Run(r.client, []string{base.AllProcesses, key}).Err()
+// ClearProcessState deletes process state data from redis.
+func (r *RDB) ClearProcessState(ps *base.ProcessState) error {
+	info := ps.Get()
+	host, pid := info.Host, info.PID
+	pkey := base.ProcessInfoKey(host, pid)
+	wkey := base.WorkersKey(host, pid)
+	return clearProcessInfoCmd.Run(r.client,
+		[]string{base.AllProcesses, pkey, base.AllWorkers, wkey}).Err()
 }

 // CancelationPubSub returns a pubsub for cancelation messages.
--- a/internal/rdb/rdb_test.go
+++ b/internal/rdb/rdb_test.go
@@ -5,8 +5,9 @@
 package rdb

 import (
+	"encoding/json"
 	"fmt"
-	"strconv"
+	"sync"
 	"testing"
 	"time"

@@ -741,81 +742,278 @@ func TestCheckAndEnqueue(t *testing.T) {
 	}
 }

-func TestReadWriteClearProcessInfo(t *testing.T) {
+func TestWriteProcessState(t *testing.T) {
 	r := setup(t)
-	pinfo := &base.ProcessInfo{
+	host, pid := "localhost", 98765
+	queues := map[string]int{"default": 2, "email": 5, "low": 1}
+
+	started := time.Now()
+	ps := base.NewProcessState(host, pid, 10, queues, false)
+	ps.SetStarted(started)
+	ps.SetStatus(base.StatusRunning)
+	ttl := 5 * time.Second
+
+	h.FlushDB(t, r.client)
+
+	err := r.WriteProcessState(ps, ttl)
+	if err != nil {
+		t.Errorf("r.WriteProcessState returned an error: %v", err)
+	}
+
+	// Check ProcessInfo was written correctly
+	pkey := base.ProcessInfoKey(host, pid)
+	data := r.client.Get(pkey).Val()
+	var got base.ProcessInfo
+	err = json.Unmarshal([]byte(data), &got)
+	if err != nil {
+		t.Fatalf("could not decode json: %v", err)
+	}
+	want := base.ProcessInfo{
+		Host:              "localhost",
+		PID:               98765,
 		Concurrency:       10,
 		Queues:            map[string]int{"default": 2, "email": 5, "low": 1},
-		PID:               98765,
-		Host:              "localhost",
-		State:             "running",
-		Started:           time.Now(),
-		ActiveWorkerCount: 1,
+		StrictPriority:    false,
+		Status:            "running",
+		Started:           started,
+		ActiveWorkerCount: 0,
+	}
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("persisted ProcessInfo was %v, want %v; (-want,+got)\n%s",
+			got, want, diff)
+	}
+	// Check ProcessInfo TTL was set correctly
+	gotTTL := r.client.TTL(pkey).Val()
+	timeCmpOpt := cmpopts.EquateApproxTime(time.Second)
+	if !cmp.Equal(ttl, gotTTL, timeCmpOpt) {
+		t.Errorf("TTL of %q was %v, want %v", pkey, gotTTL, ttl)
+	}
+	// Check ProcessInfo key was added to the set correctly
+	gotProcesses := r.client.ZRange(base.AllProcesses, 0, -1).Val()
+	wantProcesses := []string{pkey}
+	if diff := cmp.Diff(wantProcesses, gotProcesses); diff != "" {
+		t.Errorf("%q contained %v, want %v", base.AllProcesses, gotProcesses, wantProcesses)
 	}

-	tests := []struct {
-		pi  *base.ProcessInfo
-		ttl time.Duration
-	}{
-		{pinfo, 5 * time.Second},
+	// Check WorkersInfo was written correctly
+	wkey := base.WorkersKey(host, pid)
+	workerExist := r.client.Exists(wkey).Val()
+	if workerExist != 0 {
+		t.Errorf("%q key exists", wkey)
 	}
-
-	for _, tc := range tests {
-		h.FlushDB(t, r.client)
-
-		err := r.WriteProcessInfo(tc.pi, tc.ttl)
-		if err != nil {
-			t.Errorf("r.WriteProcessInfo returned an error: %v", err)
-			continue
-		}
-
-		got, err := r.ReadProcessInfo(tc.pi.Host, tc.pi.PID)
-		if err != nil {
-			t.Errorf("r.ReadProcessInfo returned an error: %v", err)
-			continue
-		}
-
-		ignoreOpt := cmpopts.IgnoreUnexported(base.ProcessInfo{})
-		if diff := cmp.Diff(tc.pi, got, ignoreOpt); diff != "" {
-			t.Errorf("r.ReadProcessInfo(%q, %d) = %+v, want %+v; (-want,+got)\n%s",
-				tc.pi.Host, tc.pi.PID, got, tc.pi, diff)
-		}
-
-		key := base.ProcessInfoKey(tc.pi.Host, tc.pi.PID)
-		gotTTL := r.client.TTL(key).Val()
-		if !cmp.Equal(tc.ttl, gotTTL, timeCmpOpt) {
-			t.Errorf("redis TTL %q returned %v, want %v", key, gotTTL, tc.ttl)
-		}
-
-		now := time.Now().UTC()
-		allKeys, err := r.client.ZRangeByScore(base.AllProcesses, &redis.ZRangeBy{
-			Min: strconv.Itoa(int(now.Unix())),
-			Max: "+inf",
-		}).Result()
-		if err != nil {
-			t.Errorf("redis ZRANGEBYSCORE %q %d +inf returned an error: %v",
-				base.AllProcesses, now.Unix(), err)
-			continue
-		}
-
-		wantAllKeys := []string{key}
-		if diff := cmp.Diff(wantAllKeys, allKeys); diff != "" {
-			t.Errorf("all keys = %v, want %v; (-want,+got)\n%s", allKeys, wantAllKeys, diff)
-		}
-
-		if err := r.ClearProcessInfo(tc.pi); err != nil {
-			t.Errorf("r.ClearProcessInfo returned an error: %v", err)
-			continue
-		}
-
-		// 1 means key exists
-		if r.client.Exists(key).Val() == 1 {
-			t.Errorf("expected %q to be deleted", key)
-		}
-
-		if r.client.ZCard(base.AllProcesses).Val() != 0 {
-			t.Errorf("expected %q to be empty", base.AllProcesses)
-		}
-
+	// Check WorkersInfo key was added to the set correctly
+	gotWorkerKeys := r.client.ZRange(base.AllWorkers, 0, -1).Val()
+	wantWorkerKeys := []string{wkey}
+	if diff := cmp.Diff(wantWorkerKeys, gotWorkerKeys); diff != "" {
+		t.Errorf("%q contained %v, want %v", base.AllWorkers, gotWorkerKeys, wantWorkerKeys)
 	}
 }
+
+func TestWriteProcessStateWithWorkers(t *testing.T) {
+	r := setup(t)
+	host, pid := "localhost", 98765
+	queues := map[string]int{"default": 2, "email": 5, "low": 1}
+	concurrency := 10
+
+	started := time.Now().Add(-10 * time.Minute)
+	w1Started := time.Now().Add(-time.Minute)
+	w2Started := time.Now().Add(-time.Second)
+	msg1 := h.NewTaskMessage("send_email", map[string]interface{}{"user_id": "123"})
+	msg2 := h.NewTaskMessage("gen_thumbnail", map[string]interface{}{"path": "some/path/to/imgfile"})
+	ps := base.NewProcessState(host, pid, concurrency, queues, false)
+	ps.SetStarted(started)
+	ps.SetStatus(base.StatusRunning)
+	ps.AddWorkerStats(msg1, w1Started)
+	ps.AddWorkerStats(msg2, w2Started)
+	ttl := 5 * time.Second
+
+	h.FlushDB(t, r.client)
+
+	err := r.WriteProcessState(ps, ttl)
+	if err != nil {
+		t.Errorf("r.WriteProcessState returned an error: %v", err)
+	}
+
+	// Check ProcessInfo was written correctly
+	pkey := base.ProcessInfoKey(host, pid)
+	data := r.client.Get(pkey).Val()
+	var got base.ProcessInfo
+	err = json.Unmarshal([]byte(data), &got)
+	if err != nil {
+		t.Fatalf("could not decode json: %v", err)
+	}
+	want := base.ProcessInfo{
+		Host:              host,
+		PID:               pid,
+		Concurrency:       concurrency,
+		Queues:            queues,
+		StrictPriority:    false,
+		Status:            "running",
+		Started:           started,
+		ActiveWorkerCount: 2,
+	}
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("persisted ProcessInfo was %v, want %v; (-want,+got)\n%s",
+			got, want, diff)
+	}
+	// Check ProcessInfo TTL was set correctly
+	gotTTL := r.client.TTL(pkey).Val()
+	timeCmpOpt := cmpopts.EquateApproxTime(time.Second)
+	if !cmp.Equal(ttl, gotTTL, timeCmpOpt) {
+		t.Errorf("TTL of %q was %v, want %v", pkey, gotTTL, ttl)
+	}
+	// Check ProcessInfo key was added to the set correctly
+	gotProcesses := r.client.ZRange(base.AllProcesses, 0, -1).Val()
+	wantProcesses := []string{pkey}
+	if diff := cmp.Diff(wantProcesses, gotProcesses); diff != "" {
+		t.Errorf("%q contained %v, want %v", base.AllProcesses, gotProcesses, wantProcesses)
+	}
+
+	// Check WorkersInfo was written correctly
+	wkey := base.WorkersKey(host, pid)
+	wdata := r.client.HGetAll(wkey).Val()
+	if len(wdata) != 2 {
+		t.Fatalf("HGETALL %q returned a hash of size %d, want 2", wkey, len(wdata))
+	}
+	gotWorkers := make(map[string]*base.WorkerInfo)
+	for key, val := range wdata {
+		var w base.WorkerInfo
+		if err := json.Unmarshal([]byte(val), &w); err != nil {
+			t.Fatalf("could not unmarshal worker's data: %v", err)
+		}
+		gotWorkers[key] = &w
+	}
+	wantWorkers := map[string]*base.WorkerInfo{
+		msg1.ID.String(): &base.WorkerInfo{
+			Host:    host,
+			PID:     pid,
+			ID:      msg1.ID,
+			Type:    msg1.Type,
+			Queue:   msg1.Queue,
+			Payload: msg1.Payload,
+			Started: w1Started,
+		},
+		msg2.ID.String(): &base.WorkerInfo{
+			Host:    host,
+			PID:     pid,
+			ID:      msg2.ID,
+			Type:    msg2.Type,
+			Queue:   msg2.Queue,
+			Payload: msg2.Payload,
+			Started: w2Started,
+		},
+	}
+	if diff := cmp.Diff(wantWorkers, gotWorkers); diff != "" {
+		t.Errorf("persisted workers info was %v, want %v; (-want,+got)\n%s",
+			gotWorkers, wantWorkers, diff)
+	}
+
+	// Check WorkersInfo TTL was set correctly
+	gotTTL = r.client.TTL(wkey).Val()
+	if !cmp.Equal(ttl, gotTTL, timeCmpOpt) {
+		t.Errorf("TTL of %q was %v, want %v", wkey, gotTTL, ttl)
+	}
+	// Check WorkersInfo key was added to the set correctly
+	gotWorkerKeys := r.client.ZRange(base.AllWorkers, 0, -1).Val()
+	wantWorkerKeys := []string{wkey}
+	if diff := cmp.Diff(wantWorkerKeys, gotWorkerKeys); diff != "" {
+		t.Errorf("%q contained %v, want %v", base.AllWorkers, gotWorkerKeys, wantWorkerKeys)
+	}
+}
+
+func TestClearProcessState(t *testing.T) {
+	r := setup(t)
+	host, pid := "127.0.0.1", 1234
+
+	h.FlushDB(t, r.client)
+
+	pkey := base.ProcessInfoKey(host, pid)
+	wkey := base.WorkersKey(host, pid)
+	otherPKey := base.ProcessInfoKey("otherhost", 12345)
+	otherWKey := base.WorkersKey("otherhost", 12345)
+	// Populate the keys.
+	if err := r.client.Set(pkey, "process-info", 0).Err(); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.client.HSet(wkey, "worker-key", "worker-info").Err(); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.client.ZAdd(base.AllProcesses, &redis.Z{Member: pkey}).Err(); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.client.ZAdd(base.AllProcesses, &redis.Z{Member: otherPKey}).Err(); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.client.ZAdd(base.AllWorkers, &redis.Z{Member: wkey}).Err(); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.client.ZAdd(base.AllWorkers, &redis.Z{Member: otherWKey}).Err(); err != nil {
+		t.Fatal(err)
+	}
+
+	ps := base.NewProcessState(host, pid, 10, map[string]int{"default": 1}, false)
+
+	err := r.ClearProcessState(ps)
+	if err != nil {
+		t.Fatalf("(*RDB).ClearProcessState failed: %v", err)
+	}
+
+	// Check all keys are cleared
+	if r.client.Exists(pkey).Val() != 0 {
+		t.Errorf("Redis key %q exists", pkey)
+	}
+	if r.client.Exists(wkey).Val() != 0 {
+		t.Errorf("Redis key %q exists", wkey)
+	}
+	gotProcessKeys := r.client.ZRange(base.AllProcesses, 0, -1).Val()
+	wantProcessKeys := []string{otherPKey}
+	if diff := cmp.Diff(wantProcessKeys, gotProcessKeys); diff != "" {
+		t.Errorf("%q contained %v, want %v", base.AllProcesses, gotProcessKeys, wantProcessKeys)
+	}
+	gotWorkerKeys := r.client.ZRange(base.AllWorkers, 0, -1).Val()
+	wantWorkerKeys := []string{otherWKey}
+	if diff := cmp.Diff(wantWorkerKeys, gotWorkerKeys); diff != "" {
+		t.Errorf("%q contained %v, want %v", base.AllWorkers, gotWorkerKeys, wantWorkerKeys)
+	}
+}
+
+func TestCancelationPubSub(t *testing.T) {
+	r := setup(t)
+
+	pubsub, err := r.CancelationPubSub()
+	if err != nil {
+		t.Fatalf("(*RDB).CancelationPubSub() returned an error: %v", err)
+	}
+
+	cancelCh := pubsub.Channel()
+
+	var (
+		mu       sync.Mutex
+		received []string
+	)
+
+	go func() {
+		for msg := range cancelCh {
+			mu.Lock()
+			received = append(received, msg.Payload)
+			mu.Unlock()
+		}
+	}()
+
+	publish := []string{"one", "two", "three"}
+
+	for _, msg := range publish {
+		r.PublishCancelation(msg)
+	}
+
+	// allow for message to reach subscribers.
+	time.Sleep(time.Second)
+
+	pubsub.Close()
+
+	mu.Lock()
+	if diff := cmp.Diff(publish, received, h.SortStringSliceOpt); diff != "" {
+		t.Errorf("subscriber received %v, want %v; (-want,+got)\n%s", received, publish, diff)
+	}
+	mu.Unlock()
+}
--- a/logger.go
+++ b/logger.go
@@ -1,35 +0,0 @@
-package asynq
-
-import (
-	"io"
-	"log"
-	"os"
-)
-
-// global logger used in asynq package.
-var logger = newLogger(os.Stderr)
-
-func newLogger(out io.Writer) *asynqLogger {
-	return &asynqLogger{
-		log.New(out, "", log.Ldate|log.Ltime|log.Lmicroseconds|log.LUTC),
-	}
-}
-
-type asynqLogger struct {
-	*log.Logger
-}
-
-func (l *asynqLogger) info(format string, args ...interface{}) {
-	format = "INFO: " + format
-	l.Printf(format, args...)
-}
-
-func (l *asynqLogger) warn(format string, args ...interface{}) {
-	format = "WARN: " + format
-	l.Printf(format, args...)
-}
-
-func (l *asynqLogger) error(format string, args ...interface{}) {
-	format = "ERROR: " + format
-	l.Printf(format, args...)
-}
--- a/processor.go
+++ b/processor.go
@@ -18,9 +18,10 @@ import (
 )

 type processor struct {
-	rdb *rdb.RDB
+	logger Logger
+	rdb    *rdb.RDB

-	pinfo *base.ProcessInfo
+	ps *base.ProcessState

 	handler Handler

@@ -31,6 +32,8 @@ type processor struct {

 	retryDelayFunc retryDelayFunc

+	errHandler ErrorHandler
+
 	// channel via which to send sync requests to syncer.
 	syncRequestCh chan<- *syncRequest

@@ -59,25 +62,29 @@ type processor struct {
 type retryDelayFunc func(n int, err error, task *Task) time.Duration

 // newProcessor constructs a new processor.
-func newProcessor(r *rdb.RDB, pinfo *base.ProcessInfo, fn retryDelayFunc, syncRequestCh chan<- *syncRequest, cancelations *base.Cancelations) *processor {
-	qcfg := normalizeQueueCfg(pinfo.Queues)
+func newProcessor(l Logger, r *rdb.RDB, ps *base.ProcessState, fn retryDelayFunc,
+	syncCh chan<- *syncRequest, c *base.Cancelations, errHandler ErrorHandler) *processor {
+	info := ps.Get()
+	qcfg := normalizeQueueCfg(info.Queues)
 	orderedQueues := []string(nil)
-	if pinfo.StrictPriority {
+	if info.StrictPriority {
 		orderedQueues = sortByPriority(qcfg)
 	}
 	return &processor{
+		logger:         l,
 		rdb:            r,
-		pinfo:          pinfo,
+		ps:             ps,
 		queueConfig:    qcfg,
 		orderedQueues:  orderedQueues,
 		retryDelayFunc: fn,
-		syncRequestCh:  syncRequestCh,
-		cancelations:   cancelations,
+		syncRequestCh:  syncCh,
+		cancelations:   c,
 		errLogLimiter:  rate.NewLimiter(rate.Every(3*time.Second), 1),
-		sema:           make(chan struct{}, pinfo.Concurrency),
+		sema:           make(chan struct{}, info.Concurrency),
 		done:           make(chan struct{}),
 		abort:          make(chan struct{}),
 		quit:           make(chan struct{}),
+		errHandler:     errHandler,
 		handler:        HandlerFunc(func(ctx context.Context, t *Task) error { return fmt.Errorf("handler not set") }),
 	}
 }
@@ -86,7 +93,7 @@ func newProcessor(r *rdb.RDB, pinfo *base.ProcessInfo, fn retryDelayFunc, syncRe
 // It's safe to call this method multiple times.
 func (p *processor) stop() {
 	p.once.Do(func() {
-		logger.info("Processor shutting down...")
+		p.logger.Info("Processor shutting down...")
 		// Unblock if processor is waiting for sema token.
 		close(p.abort)
 		// Signal the processor goroutine to stop processing tasks
@@ -102,7 +109,7 @@ func (p *processor) terminate() {
 	// IDEA: Allow user to customize this timeout value.
 	const timeout = 8 * time.Second
 	time.AfterFunc(timeout, func() { close(p.quit) })
-	logger.info("Waiting for all workers to finish...")
+	p.logger.Info("Waiting for all workers to finish...")

 	// send cancellation signal to all in-progress task handlers
 	for _, cancel := range p.cancelations.GetAll() {
@@ -113,19 +120,21 @@ func (p *processor) terminate() {
 	for i := 0; i < cap(p.sema); i++ {
 		p.sema <- struct{}{}
 	}
-	logger.info("All workers have finished")
+	p.logger.Info("All workers have finished")
 	p.restore() // move any unfinished tasks back to the queue.
 }

-func (p *processor) start() {
+func (p *processor) start(wg *sync.WaitGroup) {
 	// NOTE: The call to "restore" needs to complete before starting
 	// the processor goroutine.
 	p.restore()
+	wg.Add(1)
 	go func() {
+		defer wg.Done()
 		for {
 			select {
 			case <-p.done:
-				logger.info("Processor done")
+				p.logger.Info("Processor done")
 				return
 			default:
 				p.exec()
@@ -151,7 +160,7 @@ func (p *processor) exec() {
 	}
 	if err != nil {
 		if p.errLogLimiter.Allow() {
-			logger.error("Dequeue error: %v", err)
+			p.logger.Error("Dequeue error: %v", err)
 		}
 		return
 	}
@@ -162,11 +171,11 @@ func (p *processor) exec() {
 		p.requeue(msg)
 		return
 	case p.sema <- struct{}{}: // acquire token
-		p.pinfo.IncrActiveWorkerCount(1)
+		p.ps.AddWorkerStats(msg, time.Now())
 		go func() {
 			defer func() {
+				p.ps.DeleteWorkerStats(msg)
 				<-p.sema /* release token */
-				p.pinfo.IncrActiveWorkerCount(-1)
 			}()

 			resCh := make(chan error, 1)
@@ -181,7 +190,7 @@ 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)
+				p.logger.Warn("Quitting worker. task id=%s", msg.ID)
 				return
 			case resErr := <-resCh:
 				// Note: One of three things should happen.
@@ -189,6 +198,9 @@ func (p *processor) exec() {
 				// 2) Retry -> Removes the message from InProgress & Adds the message to Retry
 				// 3) Kill  -> Removes the message from InProgress & Adds the message to Dead
 				if resErr != nil {
+					if p.errHandler != nil {
+						p.errHandler.HandleError(task, resErr, msg.Retried, msg.Retry)
+					}
 					if msg.Retried >= msg.Retry {
 						p.kill(msg, resErr)
 					} else {
@@ -207,17 +219,17 @@ func (p *processor) exec() {
 func (p *processor) restore() {
 	n, err := p.rdb.RequeueAll()
 	if err != nil {
-		logger.error("Could not restore unfinished tasks: %v", err)
+		p.logger.Error("Could not restore unfinished tasks: %v", err)
 	}
 	if n > 0 {
-		logger.info("Restored %d unfinished tasks back to queue", n)
+		p.logger.Info("Restored %d unfinished tasks back to queue", n)
 	}
 }

 func (p *processor) requeue(msg *base.TaskMessage) {
 	err := p.rdb.Requeue(msg)
 	if err != nil {
-		logger.error("Could not push task id=%s back to queue: %v", msg.ID, err)
+		p.logger.Error("Could not push task id=%s back to queue: %v", msg.ID, err)
 	}
 }

@@ -225,7 +237,7 @@ func (p *processor) markAsDone(msg *base.TaskMessage) {
 	err := p.rdb.Done(msg)
 	if err != nil {
 		errMsg := fmt.Sprintf("Could not remove task id=%s from %q", msg.ID, base.InProgressQueue)
-		logger.warn("%s; Will retry syncing", errMsg)
+		p.logger.Warn("%s; Will retry syncing", errMsg)
 		p.syncRequestCh <- &syncRequest{
 			fn: func() error {
 				return p.rdb.Done(msg)
@@ -241,7 +253,7 @@ func (p *processor) retry(msg *base.TaskMessage, e error) {
 	err := p.rdb.Retry(msg, retryAt, e.Error())
 	if err != nil {
 		errMsg := fmt.Sprintf("Could not move task id=%s from %q to %q", msg.ID, base.InProgressQueue, base.RetryQueue)
-		logger.warn("%s; Will retry syncing", errMsg)
+		p.logger.Warn("%s; Will retry syncing", errMsg)
 		p.syncRequestCh <- &syncRequest{
 			fn: func() error {
 				return p.rdb.Retry(msg, retryAt, e.Error())
@@ -252,11 +264,11 @@ func (p *processor) retry(msg *base.TaskMessage, e error) {
 }

 func (p *processor) kill(msg *base.TaskMessage, e error) {
-	logger.warn("Retry exhausted for task id=%s", msg.ID)
+	p.logger.Warn("Retry exhausted for task id=%s", msg.ID)
 	err := p.rdb.Kill(msg, e.Error())
 	if err != nil {
 		errMsg := fmt.Sprintf("Could not move task id=%s from %q to %q", msg.ID, base.InProgressQueue, base.DeadQueue)
-		logger.warn("%s; Will retry syncing", errMsg)
+		p.logger.Warn("%s; Will retry syncing", errMsg)
 		p.syncRequestCh <- &syncRequest{
 			fn: func() error {
 				return p.rdb.Kill(msg, e.Error())
@@ -381,14 +393,18 @@ 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 {
-		logger.error("cannot parse timeout duration for %+v", msg)
-		return context.WithCancel(context.Background())
+	if err == nil && timeout != 0 {
+		ctx, cancel = context.WithTimeout(ctx, timeout)
 	}
-	if timeout == 0 {
-		return context.WithCancel(context.Background())
+	deadline, err := time.Parse(time.RFC3339, msg.Deadline)
+	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
 }
--- a/processor_test.go
+++ b/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) {
@@ -66,12 +67,13 @@ func TestProcessorSuccess(t *testing.T) {
 			processed = append(processed, task)
 			return nil
 		}
-		pi := base.NewProcessInfo("localhost", 1234, 10, defaultQueueConfig, false)
+		ps := base.NewProcessState("localhost", 1234, 10, defaultQueueConfig, false)
 		cancelations := base.NewCancelations()
-		p := newProcessor(rdbClient, pi, defaultDelayFunc, nil, cancelations)
+		p := newProcessor(testLogger, rdbClient, ps, defaultDelayFunc, nil, cancelations, nil)
 		p.handler = HandlerFunc(handler)

-		p.start()
+		var wg sync.WaitGroup
+		p.start(&wg)
 		for _, msg := range tc.incoming {
 			err := rdbClient.Enqueue(msg)
 			if err != nil {
@@ -119,24 +121,30 @@ func TestProcessorRetry(t *testing.T) {
 	now := time.Now()

 	tests := []struct {
-		enqueued  []*base.TaskMessage // initial default queue state
-		incoming  []*base.TaskMessage // tasks to be enqueued during run
-		delay     time.Duration       // retry delay duration
-		wait      time.Duration       // wait duration between starting and stopping processor for this test case
-		wantRetry []h.ZSetEntry       // tasks in retry queue at the end
-		wantDead  []*base.TaskMessage // tasks in dead queue at the end
+		enqueued     []*base.TaskMessage // initial default queue state
+		incoming     []*base.TaskMessage // tasks to be enqueued during run
+		delay        time.Duration       // retry delay duration
+		handler      Handler             // task handler
+		wait         time.Duration       // wait duration between starting and stopping processor for this test case
+		wantRetry    []h.ZSetEntry       // tasks in retry queue at the end
+		wantDead     []*base.TaskMessage // tasks in dead queue at the end
+		wantErrCount int                 // number of times error handler should be called
 	}{
 		{
 			enqueued: []*base.TaskMessage{m1, m2},
 			incoming: []*base.TaskMessage{m3, m4},
 			delay:    time.Minute,
-			wait:     time.Second,
+			handler: HandlerFunc(func(ctx context.Context, task *Task) error {
+				return fmt.Errorf(errMsg)
+			}),
+			wait: time.Second,
 			wantRetry: []h.ZSetEntry{
 				{Msg: &r2, Score: float64(now.Add(time.Minute).Unix())},
 				{Msg: &r3, Score: float64(now.Add(time.Minute).Unix())},
 				{Msg: &r4, Score: float64(now.Add(time.Minute).Unix())},
 			},
-			wantDead: []*base.TaskMessage{&r1},
+			wantDead:     []*base.TaskMessage{&r1},
+			wantErrCount: 4,
 		},
 	}

@@ -148,15 +156,22 @@ func TestProcessorRetry(t *testing.T) {
 		delayFunc := func(n int, e error, t *Task) time.Duration {
 			return tc.delay
 		}
-		handler := func(ctx context.Context, task *Task) error {
-			return fmt.Errorf(errMsg)
+		var (
+			mu sync.Mutex // guards n
+			n  int        // number of times error handler is called
+		)
+		errHandler := func(t *Task, err error, retried, maxRetry int) {
+			mu.Lock()
+			defer mu.Unlock()
+			n++
 		}
-		pi := base.NewProcessInfo("localhost", 1234, 10, defaultQueueConfig, false)
+		ps := base.NewProcessState("localhost", 1234, 10, defaultQueueConfig, false)
 		cancelations := base.NewCancelations()
-		p := newProcessor(rdbClient, pi, delayFunc, nil, cancelations)
-		p.handler = HandlerFunc(handler)
+		p := newProcessor(testLogger, rdbClient, ps, delayFunc, nil, cancelations, ErrorHandlerFunc(errHandler))
+		p.handler = tc.handler

-		p.start()
+		var wg sync.WaitGroup
+		p.start(&wg)
 		for _, msg := range tc.incoming {
 			err := rdbClient.Enqueue(msg)
 			if err != nil {
@@ -181,6 +196,10 @@ func TestProcessorRetry(t *testing.T) {
 		if l := r.LLen(base.InProgressQueue).Val(); l != 0 {
 			t.Errorf("%q has %d tasks, want 0", base.InProgressQueue, l)
 		}
+
+		if n != tc.wantErrCount {
+			t.Errorf("error handler was called %d times, want %d", n, tc.wantErrCount)
+		}
 	}
 }

@@ -212,9 +231,9 @@ func TestProcessorQueues(t *testing.T) {
 	}

 	for _, tc := range tests {
-		pi := base.NewProcessInfo("localhost", 1234, 10, tc.queueCfg, false)
 		cancelations := base.NewCancelations()
-		p := newProcessor(nil, pi, defaultDelayFunc, nil, cancelations)
+		ps := base.NewProcessState("localhost", 1234, 10, tc.queueCfg, false)
+		p := newProcessor(testLogger, nil, ps, defaultDelayFunc, nil, cancelations, nil)
 		got := p.queues()
 		if diff := cmp.Diff(tc.want, got, sortOpt); diff != "" {
 			t.Errorf("with queue config: %v\n(*processor).queues() = %v, want %v\n(-want,+got):\n%s",
@@ -280,12 +299,13 @@ func TestProcessorWithStrictPriority(t *testing.T) {
 			"low":                 1,
 		}
 		// Note: Set concurrency to 1 to make sure tasks are processed one at a time.
-		pi := base.NewProcessInfo("localhost", 1234, 1 /*concurrency */, queueCfg, true /* strict */)
 		cancelations := base.NewCancelations()
-		p := newProcessor(rdbClient, pi, defaultDelayFunc, nil, cancelations)
+		ps := base.NewProcessState("localhost", 1234, 1 /* concurrency */, queueCfg, true /*strict*/)
+		p := newProcessor(testLogger, rdbClient, ps, defaultDelayFunc, nil, cancelations, nil)
 		p.handler = HandlerFunc(handler)

-		p.start()
+		var wg sync.WaitGroup
+		p.start(&wg)
 		time.Sleep(tc.wait)
 		p.terminate()

@@ -344,3 +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")
+	}
+}
--- a/scheduler.go
+++ b/scheduler.go
@@ -5,13 +5,15 @@
 package asynq

 import (
+	"sync"
 	"time"

 	"github.com/hibiken/asynq/internal/rdb"
 )

 type scheduler struct {
-	rdb *rdb.RDB
+	logger Logger
+	rdb    *rdb.RDB

 	// channel to communicate back to the long running "scheduler" goroutine.
 	done chan struct{}
@@ -23,12 +25,13 @@ type scheduler struct {
 	qnames []string
 }

-func newScheduler(r *rdb.RDB, avgInterval time.Duration, qcfg map[string]int) *scheduler {
+func newScheduler(l Logger, r *rdb.RDB, avgInterval time.Duration, qcfg map[string]int) *scheduler {
 	var qnames []string
 	for q := range qcfg {
 		qnames = append(qnames, q)
 	}
 	return &scheduler{
+		logger:      l,
 		rdb:         r,
 		done:        make(chan struct{}),
 		avgInterval: avgInterval,
@@ -37,18 +40,20 @@ func newScheduler(r *rdb.RDB, avgInterval time.Duration, qcfg map[string]int) *s
 }

 func (s *scheduler) terminate() {
-	logger.info("Scheduler shutting down...")
+	s.logger.Info("Scheduler shutting down...")
 	// Signal the scheduler goroutine to stop polling.
 	s.done <- struct{}{}
 }

 // start starts the "scheduler" goroutine.
-func (s *scheduler) start() {
+func (s *scheduler) start(wg *sync.WaitGroup) {
+	wg.Add(1)
 	go func() {
+		defer wg.Done()
 		for {
 			select {
 			case <-s.done:
-				logger.info("Scheduler done")
+				s.logger.Info("Scheduler done")
 				return
 			case <-time.After(s.avgInterval):
 				s.exec()
@@ -59,6 +64,6 @@ func (s *scheduler) start() {

 func (s *scheduler) exec() {
 	if err := s.rdb.CheckAndEnqueue(s.qnames...); err != nil {
-		logger.error("Could not enqueue scheduled tasks: %v", err)
+		s.logger.Error("Could not enqueue scheduled tasks: %v", err)
 	}
 }
--- a/scheduler_test.go
+++ b/scheduler_test.go
@@ -5,6 +5,7 @@
 package asynq

 import (
+	"sync"
 	"testing"
 	"time"

@@ -18,7 +19,7 @@ func TestScheduler(t *testing.T) {
 	r := setup(t)
 	rdbClient := rdb.NewRDB(r)
 	const pollInterval = time.Second
-	s := newScheduler(rdbClient, pollInterval, defaultQueueConfig)
+	s := newScheduler(testLogger, rdbClient, pollInterval, defaultQueueConfig)
 	t1 := h.NewTaskMessage("gen_thumbnail", nil)
 	t2 := h.NewTaskMessage("send_email", nil)
 	t3 := h.NewTaskMessage("reindex", nil)
@@ -69,7 +70,8 @@ func TestScheduler(t *testing.T) {
 		h.SeedRetryQueue(t, r, tc.initRetry)         // initialize retry queue
 		h.SeedEnqueuedQueue(t, r, tc.initQueue)      // initialize default queue

-		s.start()
+		var wg sync.WaitGroup
+		s.start(&wg)
 		time.Sleep(tc.wait)
 		s.terminate()

--- a/servemux.go
+++ b/servemux.go
@@ -0,0 +1,139 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"context"
+	"fmt"
+	"sort"
+	"strings"
+	"sync"
+)
+
+// ServeMux is a multiplexer for asynchronous tasks.
+// It matches the type of each task against a list of registered patterns
+// and calls the handler for the pattern that most closely matches the
+// taks's type name.
+//
+// Longer patterns take precedence over shorter ones, so that if there are
+// handlers registered for both "images" and "images:thumbnails",
+// the latter handler will be called for tasks with a type name beginning with
+// "images:thumbnails" and the former will receive tasks with type name beginning
+// with "images".
+type ServeMux struct {
+	mu sync.RWMutex
+	m  map[string]muxEntry
+	es []muxEntry // slice of entries sorted from longest to shortest.
+}
+
+type muxEntry struct {
+	h       Handler
+	pattern string
+}
+
+// NewServeMux allocates and returns a new ServeMux.
+func NewServeMux() *ServeMux {
+	return new(ServeMux)
+}
+
+// ProcessTask dispatches the task to the handler whose
+// pattern most closely matches the task type.
+func (mux *ServeMux) ProcessTask(ctx context.Context, task *Task) error {
+	h, _ := mux.Handler(task)
+	return h.ProcessTask(ctx, task)
+}
+
+// Handler returns the handler to use for the given task.
+// It always return a non-nil handler.
+//
+// Handler also returns the registered pattern that matches the task.
+//
+// If there is no registered handler that applies to the task,
+// handler returns a 'not found' handler which returns an error.
+func (mux *ServeMux) Handler(t *Task) (h Handler, pattern string) {
+	mux.mu.RLock()
+	defer mux.mu.RUnlock()
+
+	h, pattern = mux.match(t.Type)
+	if h == nil {
+		h, pattern = NotFoundHandler(), ""
+	}
+	return h, pattern
+}
+
+// Find a handler on a handler map given a typename string.
+// Most-specific (longest) pattern wins.
+func (mux *ServeMux) match(typename string) (h Handler, pattern string) {
+	// Check for exact match first.
+	v, ok := mux.m[typename]
+	if ok {
+		return v.h, v.pattern
+	}
+
+	// Check for longest valid match.
+	// mux.es contains all patterns from longest to shortest.
+	for _, e := range mux.es {
+		if strings.HasPrefix(typename, e.pattern) {
+			return e.h, e.pattern
+		}
+	}
+	return nil, ""
+
+}
+
+// Handle registers the handler for the given pattern.
+// If a handler already exists for pattern, Handle panics.
+func (mux *ServeMux) Handle(pattern string, handler Handler) {
+	mux.mu.Lock()
+	defer mux.mu.Unlock()
+
+	if pattern == "" {
+		panic("asynq: invalid pattern")
+	}
+	if handler == nil {
+		panic("asynq: nil handler")
+	}
+	if _, exist := mux.m[pattern]; exist {
+		panic("asynq: multiple registrations for " + pattern)
+	}
+
+	if mux.m == nil {
+		mux.m = make(map[string]muxEntry)
+	}
+	e := muxEntry{h: handler, pattern: pattern}
+	mux.m[pattern] = e
+	mux.es = appendSorted(mux.es, e)
+}
+
+func appendSorted(es []muxEntry, e muxEntry) []muxEntry {
+	n := len(es)
+	i := sort.Search(n, func(i int) bool {
+		return len(es[i].pattern) < len(e.pattern)
+	})
+	if i == n {
+		return append(es, e)
+	}
+	// we now know that i points at where we want to insert.
+	es = append(es, muxEntry{}) // try to grow the slice in place, any entry works.
+	copy(es[i+1:], es[i:])      // shift shorter entries down.
+	es[i] = e
+	return es
+}
+
+// HandleFunc registers the handler function for the given pattern.
+func (mux *ServeMux) HandleFunc(pattern string, handler func(context.Context, *Task) error) {
+	if handler == nil {
+		panic("asynq: nil handler")
+	}
+	mux.Handle(pattern, HandlerFunc(handler))
+}
+
+// NotFound returns an error indicating that the handler was not found for the given task.
+func NotFound(ctx context.Context, task *Task) error {
+	return fmt.Errorf("handler not found for task %q", task.Type)
+}
+
+// NotFoundHandler returns a simple task handler that returns a ``not found`` error.
+func NotFoundHandler() Handler { return HandlerFunc(NotFound) }
--- a/servemux_test.go
+++ b/servemux_test.go
@@ -0,0 +1,116 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"context"
+	"testing"
+)
+
+var called string
+
+// makeFakeHandler returns a handler that updates the global called variable
+// to the given identity.
+func makeFakeHandler(identity string) Handler {
+	return HandlerFunc(func(ctx context.Context, t *Task) error {
+		called = identity
+		return nil
+	})
+}
+
+// A list of pattern, handler pair that is registered with mux.
+var serveMuxRegister = []struct {
+	pattern string
+	h       Handler
+}{
+	{"email:", makeFakeHandler("default email handler")},
+	{"email:signup", makeFakeHandler("signup email handler")},
+	{"csv:export", makeFakeHandler("csv export handler")},
+}
+
+var serveMuxTests = []struct {
+	typename string // task's type name
+	want     string // identifier of the handler that should be called
+}{
+	{"email:signup", "signup email handler"},
+	{"csv:export", "csv export handler"},
+	{"email:daily", "default email handler"},
+}
+
+func TestServeMux(t *testing.T) {
+	mux := NewServeMux()
+	for _, e := range serveMuxRegister {
+		mux.Handle(e.pattern, e.h)
+	}
+
+	for _, tc := range serveMuxTests {
+		called = "" // reset to zero value
+
+		task := NewTask(tc.typename, nil)
+		if err := mux.ProcessTask(context.Background(), task); err != nil {
+			t.Fatal(err)
+		}
+
+		if called != tc.want {
+			t.Errorf("%q handler was called for task %q, want %q to be called", called, task.Type, tc.want)
+		}
+	}
+}
+
+func TestServeMuxRegisterNilHandler(t *testing.T) {
+	defer func() {
+		if err := recover(); err == nil {
+			t.Error("expected call to mux.HandleFunc to panic")
+		}
+	}()
+
+	mux := NewServeMux()
+	mux.HandleFunc("email:signup", nil)
+}
+
+func TestServeMuxRegisterEmptyPattern(t *testing.T) {
+	defer func() {
+		if err := recover(); err == nil {
+			t.Error("expected call to mux.HandleFunc to panic")
+		}
+	}()
+
+	mux := NewServeMux()
+	mux.Handle("", makeFakeHandler("email"))
+}
+
+func TestServeMuxRegisterDuplicatePattern(t *testing.T) {
+	defer func() {
+		if err := recover(); err == nil {
+			t.Error("expected call to mux.HandleFunc to panic")
+		}
+	}()
+
+	mux := NewServeMux()
+	mux.Handle("email", makeFakeHandler("email"))
+	mux.Handle("email", makeFakeHandler("email:default"))
+}
+
+var notFoundTests = []struct {
+	typename string // task's type name
+}{
+	{"image:minimize"},
+	{"csv:"}, // registered patterns match the task's type prefix, not the other way around.
+}
+
+func TestServeMuxNotFound(t *testing.T) {
+	mux := NewServeMux()
+	for _, e := range serveMuxRegister {
+		mux.Handle(e.pattern, e.h)
+	}
+
+	for _, tc := range notFoundTests {
+		task := NewTask(tc.typename, nil)
+		err := mux.ProcessTask(context.Background(), task)
+		if err == nil {
+			t.Errorf("ProcessTask did not return error for task %q, should return 'not found' error", task.Type)
+		}
+	}
+}
--- a/subscriber.go
+++ b/subscriber.go
@@ -5,12 +5,15 @@
 package asynq

 import (
+	"sync"
+
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
 )

 type subscriber struct {
-	rdb *rdb.RDB
+	logger Logger
+	rdb    *rdb.RDB

 	// channel to communicate back to the long running "subscriber" goroutine.
 	done chan struct{}
@@ -19,8 +22,9 @@ type subscriber struct {
 	cancelations *base.Cancelations
 }

-func newSubscriber(rdb *rdb.RDB, cancelations *base.Cancelations) *subscriber {
+func newSubscriber(l Logger, rdb *rdb.RDB, cancelations *base.Cancelations) *subscriber {
 	return &subscriber{
+		logger:       l,
 		rdb:          rdb,
 		done:         make(chan struct{}),
 		cancelations: cancelations,
@@ -28,28 +32,30 @@ func newSubscriber(rdb *rdb.RDB, cancelations *base.Cancelations) *subscriber {
 }

 func (s *subscriber) terminate() {
-	logger.info("Subscriber shutting down...")
+	s.logger.Info("Subscriber shutting down...")
 	// Signal the subscriber goroutine to stop.
 	s.done <- struct{}{}
 }

-func (s *subscriber) start() {
+func (s *subscriber) start(wg *sync.WaitGroup) {
 	pubsub, err := s.rdb.CancelationPubSub()
 	cancelCh := pubsub.Channel()
 	if err != nil {
-		logger.error("cannot subscribe to cancelation channel: %v", err)
+		s.logger.Error("cannot subscribe to cancelation channel: %v", err)
 		return
 	}
+	wg.Add(1)
 	go func() {
+		defer wg.Done()
 		for {
 			select {
 			case <-s.done:
 				pubsub.Close()
-				logger.info("Subscriber done")
+				s.logger.Info("Subscriber done")
 				return
 			case msg := <-cancelCh:
-				cancel := s.cancelations.Get(msg.Payload)
-				if cancel != nil {
+				cancel, ok := s.cancelations.Get(msg.Payload)
+				if ok {
 					cancel()
 				}
 			}
--- a/subscriber_test.go
+++ b/subscriber_test.go
@@ -5,6 +5,7 @@
 package asynq

 import (
+	"sync"
 	"testing"
 	"time"

@@ -26,15 +27,19 @@ func TestSubscriber(t *testing.T) {
 	}

 	for _, tc := range tests {
+		var mu sync.Mutex
 		called := false
 		fakeCancelFunc := func() {
+			mu.Lock()
+			defer mu.Unlock()
 			called = true
 		}
 		cancelations := base.NewCancelations()
 		cancelations.Add(tc.registeredID, fakeCancelFunc)

-		subscriber := newSubscriber(rdbClient, cancelations)
-		subscriber.start()
+		subscriber := newSubscriber(testLogger, rdbClient, cancelations)
+		var wg sync.WaitGroup
+		subscriber.start(&wg)

 		if err := rdbClient.PublishCancelation(tc.publishID); err != nil {
 			subscriber.terminate()
@@ -44,6 +49,7 @@ func TestSubscriber(t *testing.T) {
 		// allow for redis to publish message
 		time.Sleep(time.Second)

+		mu.Lock()
 		if called != tc.wantCalled {
 			if tc.wantCalled {
 				t.Errorf("fakeCancelFunc was not called, want the function to be called")
@@ -51,6 +57,7 @@ func TestSubscriber(t *testing.T) {
 				t.Errorf("fakeCancelFunc was called, want the function to not be called")
 			}
 		}
+		mu.Unlock()

 		subscriber.terminate()
 	}
--- a/syncer.go
+++ b/syncer.go
@@ -5,12 +5,15 @@
 package asynq

 import (
+	"sync"
 	"time"
 )

 // syncer is responsible for queuing up failed requests to redis and retry
 // those requests to sync state between the background process and redis.
 type syncer struct {
+	logger Logger
+
 	requestsCh <-chan *syncRequest

 	// channel to communicate back to the long running "syncer" goroutine.
@@ -25,8 +28,9 @@ type syncRequest struct {
 	errMsg string       // error message
 }

-func newSyncer(requestsCh <-chan *syncRequest, interval time.Duration) *syncer {
+func newSyncer(l Logger, requestsCh <-chan *syncRequest, interval time.Duration) *syncer {
 	return &syncer{
+		logger:     l,
 		requestsCh: requestsCh,
 		done:       make(chan struct{}),
 		interval:   interval,
@@ -34,13 +38,15 @@ func newSyncer(requestsCh <-chan *syncRequest, interval time.Duration) *syncer {
 }

 func (s *syncer) terminate() {
-	logger.info("Syncer shutting down...")
+	s.logger.Info("Syncer shutting down...")
 	// Signal the syncer goroutine to stop.
 	s.done <- struct{}{}
 }

-func (s *syncer) start() {
+func (s *syncer) start(wg *sync.WaitGroup) {
+	wg.Add(1)
 	go func() {
+		defer wg.Done()
 		var requests []*syncRequest
 		for {
 			select {
@@ -48,10 +54,10 @@ func (s *syncer) start() {
 				// Try sync one last time before shutting down.
 				for _, req := range requests {
 					if err := req.fn(); err != nil {
-						logger.error(req.errMsg)
+						s.logger.Error(req.errMsg)
 					}
 				}
-				logger.info("Syncer done")
+				s.logger.Info("Syncer done")
 				return
 			case req := <-s.requestsCh:
 				requests = append(requests, req)
--- a/syncer_test.go
+++ b/syncer_test.go
@@ -5,10 +5,11 @@
 package asynq

 import (
+	"fmt"
+	"sync"
 	"testing"
 	"time"

-	"github.com/go-redis/redis/v7"
 	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
@@ -26,8 +27,9 @@ func TestSyncer(t *testing.T) {

 	const interval = time.Second
 	syncRequestCh := make(chan *syncRequest)
-	syncer := newSyncer(syncRequestCh, interval)
-	syncer.start()
+	syncer := newSyncer(testLogger, syncRequestCh, interval)
+	var wg sync.WaitGroup
+	syncer.start(&wg)
 	defer syncer.terminate()

 	for _, msg := range inProgress {
@@ -48,53 +50,43 @@ func TestSyncer(t *testing.T) {
 }

 func TestSyncerRetry(t *testing.T) {
-	inProgress := []*base.TaskMessage{
-		h.NewTaskMessage("send_email", nil),
-		h.NewTaskMessage("reindex", nil),
-		h.NewTaskMessage("gen_thumbnail", nil),
-	}
-	goodClient := setup(t)
-	h.SeedInProgressQueue(t, goodClient, inProgress)
-
-	// Simulate the situation where redis server is down
-	// by connecting to a wrong port.
-	badClient := redis.NewClient(&redis.Options{
-		Addr: "localhost:6390",
-	})
-	rdbClient := rdb.NewRDB(badClient)
-
 	const interval = time.Second
 	syncRequestCh := make(chan *syncRequest)
-	syncer := newSyncer(syncRequestCh, interval)
-	syncer.start()
+	syncer := newSyncer(testLogger, syncRequestCh, interval)
+
+	var wg sync.WaitGroup
+	syncer.start(&wg)
 	defer syncer.terminate()

-	for _, msg := range inProgress {
-		m := msg
-		syncRequestCh <- &syncRequest{
-			fn: func() error {
-				return rdbClient.Done(m)
-			},
+	var (
+		mu      sync.Mutex
+		counter int
+	)
+
+	// Increment the counter for each call.
+	// Initial call will fail and second call will succeed.
+	requestFunc := func() error {
+		mu.Lock()
+		defer mu.Unlock()
+		if counter == 0 {
+			counter++
+			return fmt.Errorf("zero")
 		}
+		counter++
+		return nil
 	}

-	time.Sleep(2 * interval) // ensure that syncer runs at least once
-
-	// Sanity check to ensure that message was not successfully deleted
-	// from in-progress list.
-	gotInProgress := h.GetInProgressMessages(t, goodClient)
-	if l := len(gotInProgress); l != len(inProgress) {
-		t.Errorf("%q has length %d; want %d", base.InProgressQueue, l, len(inProgress))
+	syncRequestCh <- &syncRequest{
+		fn:     requestFunc,
+		errMsg: "error",
 	}

-	// FIXME: This assignment introduces data race and running the test with -race will fail.
-	// simualate failover.
-	rdbClient = rdb.NewRDB(goodClient)
+	// allow syncer to retry
+	time.Sleep(3 * interval)

-	time.Sleep(2 * interval) // ensure that syncer runs at least once
-
-	gotInProgress = h.GetInProgressMessages(t, goodClient)
-	if l := len(gotInProgress); l != 0 {
-		t.Errorf("%q has length %d; want 0", base.InProgressQueue, l)
+	mu.Lock()
+	if counter != 2 {
+		t.Errorf("counter = %d, want 2", counter)
 	}
+	mu.Unlock()
 }
--- a/tools/asynqmon/cmd/ps.go
+++ b/tools/asynqmon/cmd/ps.go
@@ -73,7 +73,7 @@ func ps(cmd *cobra.Command, args []string) {
 	printRows := func(w io.Writer, tmpl string) {
 		for _, ps := range processes {
 			fmt.Fprintf(w, tmpl,
-				ps.Host, ps.PID, ps.State,
+				ps.Host, ps.PID, ps.Status,
 				fmt.Sprintf("%d/%d", ps.ActiveWorkerCount, ps.Concurrency),
 				formatQueues(ps.Queues), timeAgo(ps.Started))
 		}
--- a/tools/asynqmon/cmd/workers.go
+++ b/tools/asynqmon/cmd/workers.go
@@ -0,0 +1,75 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package cmd
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"sort"
+
+	"github.com/go-redis/redis/v7"
+	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+// workersCmd represents the workers command
+var workersCmd = &cobra.Command{
+	Use:   "workers",
+	Short: "Shows all running workers information",
+	Long: `Workers (asynqmon workers) will show all running workers information.
+
+The command shows the follwoing for each worker:
+* Process in which the worker is running
+* ID of the task worker is processing
+* Type of the task worker is processing
+* Payload of the task worker is processing
+* Queue that the task was pulled from.
+* Time the worker started processing the task`,
+	Args: cobra.NoArgs,
+	Run:  workers,
+}
+
+func init() {
+	rootCmd.AddCommand(workersCmd)
+}
+
+func workers(cmd *cobra.Command, args []string) {
+	r := rdb.NewRDB(redis.NewClient(&redis.Options{
+		Addr:     viper.GetString("uri"),
+		DB:       viper.GetInt("db"),
+		Password: viper.GetString("password"),
+	}))
+
+	workers, err := r.ListWorkers()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	if len(workers) == 0 {
+		fmt.Println("No workers")
+		return
+	}
+
+	// sort by started timestamp or ID.
+	sort.Slice(workers, func(i, j int) bool {
+		x, y := workers[i], workers[j]
+		if x.Started != y.Started {
+			return x.Started.Before(y.Started)
+		}
+		return x.ID.String() < y.ID.String()
+	})
+
+	cols := []string{"Process", "ID", "Type", "Payload", "Queue", "Started"}
+	printRows := func(w io.Writer, tmpl string) {
+		for _, wk := range workers {
+			fmt.Fprintf(w, tmpl,
+				fmt.Sprintf("%s:%d", wk.Host, wk.PID), wk.ID, wk.Type, wk.Payload, wk.Queue, timeAgo(wk.Started))
+		}
+	}
+	printTable(cols, printRows)
+}
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -0,0 +1,14 @@
+module github.com/hibiken/asynq/tools
+
+go 1.13
+
+require (
+	github.com/go-redis/redis/v7 v7.2.0
+	github.com/hibiken/asynq v0.4.0
+	github.com/mitchellh/go-homedir v1.1.0
+	github.com/rs/xid v1.2.1
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/viper v1.6.2
+)
+
+replace github.com/hibiken/asynq => ./..
--- a/tools/go.sum
+++ b/tools/go.sum
@@ -0,0 +1,195 @@
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Author	SHA1	Message	Date
Ken Hibino	cf7a677312	v0.6.1	2020-03-12 08:42:34 -07:00
Ken Hibino	0bc6eba021	Allow custom logger to be used in Background	2020-03-12 08:40:37 -07:00
Ken Hibino	d664d68fa4	Extract out log package	2020-03-09 07:17:52 -07:00
Ken Hibino	a425f54d23	[ci skip] Remove todo comment	2020-03-09 06:09:07 -07:00
Ken Hibino	3c722386b0	Add Deadline option when enqueuing tasks Deadline option sets the deadline for the given task's context deadline.	2020-03-08 17:12:42 -07:00
Ken Hibino	25992c2781	[ci skip] Minor readme update	2020-03-03 21:39:16 -08:00
Ken Hibino	b9e3cad7a7	[ci skip] Update readme - Added flow chart for task queue - Reordered sections	2020-03-02 07:06:11 -08:00
Ken Hibino	b6486716b4	v0.6.0	2020-03-01 15:54:59 -08:00
Ken Hibino	742ed6546f	Add ServeMux type Allow user to use ServeMux type to be used as a Handler. ServeMux API is design to be similar to net/http.ServeMux API.	2020-03-01 15:53:18 -08:00
Ken Hibino	897ab4e28b	Add ErrorHandler type to changelog	2020-02-29 22:09:13 -08:00
Ken Hibino	a4e4c0b1d5	Call error handler when task was not processed successfully	2020-02-29 22:09:13 -08:00
Ken Hibino	95b7dcaad4	Clean up processor test	2020-02-29 22:09:13 -08:00
Ken Hibino	8d3248e850	Add ErrorHandler type and add it to Config	2020-02-29 22:09:13 -08:00
Ken Hibino	e69264dc04	Run travis build with go v1.14.x	2020-02-27 08:28:35 -08:00
Ken Hibino	93ff4e4149	v0.5.0	2020-02-23 20:44:44 -08:00
Ken Hibino	3ee97f327e	[ci skip] Update readme	2020-02-23 20:44:44 -08:00
Ken Hibino	49c117f4d1	Change Client APIs Use `Enqueue`, `EnqueueAt`, and `EnqueueIn` to enqueue and schedule tasks. `Schedule` method was removed.	2020-02-23 20:40:40 -08:00
Ken Hibino	5b53a2aee9	Update redis package to v7.2.0	2020-02-22 21:21:55 -08:00
Ken Hibino	26e399bc9c	Add workers command to asynqmon	2020-02-22 21:21:55 -08:00
Ken Hibino	e21fe3bd79	Add ListWorkers to RDB	2020-02-22 21:21:55 -08:00
Ken Hibino	37c6c73d9b	Add test for cancelation pubsub	2020-02-22 15:16:24 -08:00
Ken Hibino	5775a5818d	Update WriteProcessState to write both ProcessInfo and WorkerInfo to redis	2020-02-22 08:56:51 -08:00
Ken Hibino	e3c9aae8c7	Include worker stats to ProcessState	2020-02-22 08:56:51 -08:00
Ken Hibino	9e02a91808	Add workers key in base package	2020-02-22 08:56:51 -08:00
Ken Hibino	830020eb39	Add ProcessState type to base package	2020-02-22 08:56:51 -08:00
Ken Hibino	f9a6c6156f	[ci skip] Add codecov badge in readme	2020-02-19 21:37:54 -08:00
Ken Hibino	8540172306	Update travis.yml to upload coverage report to codecov	2020-02-19 21:27:40 -08:00
Ken Hibino	b44908fefd	Move tools to its own go module	2020-02-17 21:55:55 -08:00
Ken Hibino	e78d5e4171	Enable the race detector in CI builds	2020-02-16 21:25:10 -08:00
Ken Hibino	0cc486a975	Fix data race in syncer test	2020-02-16 21:25:10 -08:00
Ken Hibino	906f231e6c	Fix data race in subscriber test	2020-02-16 18:22:59 -08:00
Ken Hibino	39f237899b	Clean up heartbeater test	2020-02-16 18:22:59 -08:00
Ken Hibino	3d9a222bb3	Use sync.WaitGroup for shutdown	2020-02-16 18:22:59 -08:00
Ken Hibino	2bcaea52ce	Make heartbeater goroutine a monitor goroutine for process info.	2020-02-16 18:22:59 -08:00