(cli): Add dash command

.github/workflows/build.yml

@@ -28,9 +28,6 @@ jobs:
       - name: Build x module
         run: cd x && go build -v ./... && cd ..
 
-      - name: Build tools module
-        run: cd tools && go build -v ./... && cd ..
-
       - name: Test core module
         run: go test -race -v -coverprofile=coverage.txt -covermode=atomic ./...
 
@@ -42,3 +39,29 @@ jobs:
 
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v1
+
+  build-tool:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        go-version: [1.18.x]
+    runs-on: ${{ matrix.os }}
+    services:
+      redis:
+        image: redis
+        ports:
+          - 6379:6379
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Build tools module
+        run: cd tools && go build -v ./... && cd ..
+
+      - name: Test tools module
+        run: cd tools && go test -race -v ./... && cd ..
+

tools/asynq/cmd/dash.go

@@ -0,0 +1,44 @@
+// Copyright 2022 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"
+	"os"
+	"time"
+
+	"github.com/MakeNowJust/heredoc/v2"
+	"github.com/hibiken/asynq/tools/asynq/cmd/dash"
+	"github.com/spf13/cobra"
+)
+
+var (
+	flagPollInterval = 8 * time.Second
+)
+
+func init() {
+	rootCmd.AddCommand(dashCmd)
+	dashCmd.Flags().DurationVar(&flagPollInterval, "refresh", 8*time.Second, "Interval between data refresh (default: 8s, min allowed: 1s)")
+}
+
+var dashCmd = &cobra.Command{
+	Use:   "dash",
+	Short: "View dashboard",
+	Long: heredoc.Doc(`
+		Display interactive dashboard.`),
+	Args: cobra.NoArgs,
+	Example: heredoc.Doc(`
+        $ asynq dash
+        $ asynq dash --refresh=3s`),
+	Run: func(cmd *cobra.Command, args []string) {
+		if flagPollInterval < 1*time.Second {
+			fmt.Println("error: --refresh cannot be less than 1s")
+			os.Exit(1)
+		}
+		dash.Run(dash.Options{
+			PollInterval: flagPollInterval,
+		})
+	},
+}

tools/asynq/cmd/dash/dash.go

@@ -0,0 +1,219 @@
+// Copyright 2022 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 dash
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+)
+
+// viewType is an enum for dashboard views.
+type viewType int
+
+const (
+	viewTypeQueues viewType = iota
+	viewTypeQueueDetails
+	viewTypeHelp
+)
+
+// State holds dashboard state.
+type State struct {
+	queues []*asynq.QueueInfo
+	tasks  []*asynq.TaskInfo
+	groups []*asynq.GroupInfo
+	err    error
+
+	// Note: index zero corresponds to the table header; index=1 correctponds to the first element
+	queueTableRowIdx int             // highlighted row in queue table
+	taskTableRowIdx  int             // highlighted row in task table
+	groupTableRowIdx int             // highlighted row in group table
+	taskState        asynq.TaskState // highlighted task state in queue details view
+	taskID           string          // selected task ID
+
+	selectedQueue *asynq.QueueInfo // queue shown on queue details view
+	selectedGroup *asynq.GroupInfo
+	selectedTask  *asynq.TaskInfo
+
+	pageNum int // pagination page number
+
+	view     viewType // current view type
+	prevView viewType // to support "go back"
+}
+
+func (s *State) DebugString() string {
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf("len(queues)=%d ", len(s.queues)))
+	b.WriteString(fmt.Sprintf("len(tasks)=%d ", len(s.tasks)))
+	b.WriteString(fmt.Sprintf("len(groups)=%d ", len(s.groups)))
+	b.WriteString(fmt.Sprintf("err=%v ", s.err))
+
+	if s.taskState != 0 {
+		b.WriteString(fmt.Sprintf("taskState=%s ", s.taskState.String()))
+	} else {
+		b.WriteString(fmt.Sprintf("taskState=0"))
+	}
+	b.WriteString(fmt.Sprintf("taskID=%s ", s.taskID))
+
+	b.WriteString(fmt.Sprintf("queueTableRowIdx=%d ", s.queueTableRowIdx))
+	b.WriteString(fmt.Sprintf("taskTableRowIdx=%d ", s.taskTableRowIdx))
+	b.WriteString(fmt.Sprintf("groupTableRowIdx=%d ", s.groupTableRowIdx))
+
+	if s.selectedQueue != nil {
+		b.WriteString(fmt.Sprintf("selectedQueue={Queue:%s} ", s.selectedQueue.Queue))
+	} else {
+		b.WriteString("selectedQueue=nil ")
+	}
+
+	if s.selectedGroup != nil {
+		b.WriteString(fmt.Sprintf("selectedGroup={Group:%s} ", s.selectedGroup.Group))
+	} else {
+		b.WriteString("selectedGroup=nil ")
+	}
+
+	if s.selectedTask != nil {
+		b.WriteString(fmt.Sprintf("selectedTask={ID:%s} ", s.selectedTask.ID))
+	} else {
+		b.WriteString("selectedTask=nil ")
+	}
+
+	b.WriteString(fmt.Sprintf("pageNum=%d", s.pageNum))
+	return b.String()
+}
+
+type Options struct {
+	DebugMode    bool
+	PollInterval time.Duration
+}
+
+func Run(opts Options) {
+	s, err := tcell.NewScreen()
+	if err != nil {
+		fmt.Printf("failed to create a screen: %v\n", err)
+		os.Exit(1)
+	}
+	if err := s.Init(); err != nil {
+		fmt.Printf("failed to initialize screen: %v\n", err)
+		os.Exit(1)
+	}
+	s.SetStyle(baseStyle) // set default text style
+
+	var (
+		state = State{} // confined in this goroutine only; DO NOT SHARE
+
+		inspector = asynq.NewInspector(asynq.RedisClientOpt{Addr: ":6379"})
+		ticker    = time.NewTicker(opts.PollInterval)
+
+		eventCh = make(chan tcell.Event)
+		done    = make(chan struct{})
+
+		// channels to send/receive data fetched asynchronously
+		errorCh  = make(chan error)
+		queueCh  = make(chan *asynq.QueueInfo)
+		taskCh   = make(chan *asynq.TaskInfo)
+		queuesCh = make(chan []*asynq.QueueInfo)
+		groupsCh = make(chan []*asynq.GroupInfo)
+		tasksCh  = make(chan []*asynq.TaskInfo)
+	)
+	defer ticker.Stop()
+
+	f := dataFetcher{
+		inspector,
+		opts,
+		s,
+		errorCh,
+		queueCh,
+		taskCh,
+		queuesCh,
+		groupsCh,
+		tasksCh,
+	}
+
+	d := dashDrawer{
+		s,
+		opts,
+	}
+
+	h := keyEventHandler{
+		s:            s,
+		fetcher:      &f,
+		drawer:       &d,
+		state:        &state,
+		done:         done,
+		ticker:       ticker,
+		pollInterval: opts.PollInterval,
+	}
+
+	go fetchQueues(inspector, queuesCh, errorCh, opts)
+	go s.ChannelEvents(eventCh, done) // TODO: Double check that we are not leaking goroutine with this one.
+	d.Draw(&state)                    // draw initial screen
+
+	for {
+		// Update screen
+		s.Show()
+
+		select {
+		case ev := <-eventCh:
+			// Process event
+			switch ev := ev.(type) {
+			case *tcell.EventResize:
+				s.Sync()
+			case *tcell.EventKey:
+				h.HandleKeyEvent(ev)
+			}
+
+		case <-ticker.C:
+			f.Fetch(&state)
+
+		case queues := <-queuesCh:
+			state.queues = queues
+			state.err = nil
+			if len(queues) < state.queueTableRowIdx {
+				state.queueTableRowIdx = len(queues)
+			}
+			d.Draw(&state)
+
+		case q := <-queueCh:
+			state.selectedQueue = q
+			state.err = nil
+			d.Draw(&state)
+
+		case groups := <-groupsCh:
+			state.groups = groups
+			state.err = nil
+			if len(groups) < state.groupTableRowIdx {
+				state.groupTableRowIdx = len(groups)
+			}
+			d.Draw(&state)
+
+		case tasks := <-tasksCh:
+			state.tasks = tasks
+			state.err = nil
+			if len(tasks) < state.taskTableRowIdx {
+				state.taskTableRowIdx = len(tasks)
+			}
+			d.Draw(&state)
+
+		case t := <-taskCh:
+			state.selectedTask = t
+			state.err = nil
+			d.Draw(&state)
+
+		case err := <-errorCh:
+			if errors.Is(err, asynq.ErrTaskNotFound) {
+				state.selectedTask = nil
+			} else {
+				state.err = err
+			}
+			d.Draw(&state)
+		}
+	}
+
+}

tools/asynq/cmd/dash/draw.go

@@ -0,0 +1,724 @@
+// Copyright 2022 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 dash
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+	"unicode/utf8"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+	"github.com/mattn/go-runewidth"
+)
+
+var (
+	baseStyle  = tcell.StyleDefault.Background(tcell.ColorReset).Foreground(tcell.ColorReset)
+	labelStyle = baseStyle.Foreground(tcell.ColorLightGray)
+
+	// styles for bar graph
+	activeStyle      = baseStyle.Foreground(tcell.ColorBlue)
+	pendingStyle     = baseStyle.Foreground(tcell.ColorGreen)
+	aggregatingStyle = baseStyle.Foreground(tcell.ColorLightGreen)
+	scheduledStyle   = baseStyle.Foreground(tcell.ColorYellow)
+	retryStyle       = baseStyle.Foreground(tcell.ColorPink)
+	archivedStyle    = baseStyle.Foreground(tcell.ColorPurple)
+	completedStyle   = baseStyle.Foreground(tcell.ColorDarkGreen)
+)
+
+// drawer draws UI with the given state.
+type drawer interface {
+	Draw(state *State)
+}
+
+type dashDrawer struct {
+	s    tcell.Screen
+	opts Options
+}
+
+func (dd *dashDrawer) Draw(state *State) {
+	s, opts := dd.s, dd.opts
+	s.Clear()
+	// Simulate data update on every render
+	d := NewScreenDrawer(s)
+	switch state.view {
+	case viewTypeQueues:
+		d.Println("=== Queues ===", baseStyle.Bold(true))
+		d.NL()
+		drawQueueSizeGraphs(d, state)
+		d.NL()
+		drawQueueTable(d, baseStyle, state)
+	case viewTypeQueueDetails:
+		d.Println("=== Queue Summary ===", baseStyle.Bold(true))
+		d.NL()
+		drawQueueSummary(d, state)
+		d.NL()
+		d.NL()
+		d.Println("=== Tasks ===", baseStyle.Bold(true))
+		d.NL()
+		drawTaskStateBreakdown(d, baseStyle, state)
+		d.NL()
+		drawTaskTable(d, state)
+		drawTaskModal(d, state)
+	case viewTypeHelp:
+		drawHelp(d)
+	}
+	d.GoToBottom()
+	if opts.DebugMode {
+		drawDebugInfo(d, state)
+	} else {
+		drawFooter(d, state)
+	}
+}
+
+func drawQueueSizeGraphs(d *ScreenDrawer, state *State) {
+	var qnames []string
+	var qsizes []string // queue size in strings
+	maxSize := 1        // not zero to avoid division by zero
+	for _, q := range state.queues {
+		qnames = append(qnames, q.Queue)
+		qsizes = append(qsizes, strconv.Itoa(q.Size))
+		if q.Size > maxSize {
+			maxSize = q.Size
+		}
+	}
+	qnameWidth := maxwidth(qnames)
+	qsizeWidth := maxwidth(qsizes)
+
+	// Calculate the multipler to scale the graph
+	screenWidth, _ := d.Screen().Size()
+	graphMaxWidth := screenWidth - (qnameWidth + qsizeWidth + 3) // <qname> |<graph> <size>
+	multipiler := 1.0
+	if graphMaxWidth < maxSize {
+		multipiler = float64(graphMaxWidth) / float64(maxSize)
+	}
+
+	const tick = '▇'
+	for _, q := range state.queues {
+		d.Print(q.Queue, baseStyle)
+		d.Print(strings.Repeat(" ", qnameWidth-runewidth.StringWidth(q.Queue)+1), baseStyle) // padding between qname and graph
+		d.Print("|", baseStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Active)*multipiler))), activeStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Pending)*multipiler))), pendingStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Aggregating)*multipiler))), aggregatingStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Scheduled)*multipiler))), scheduledStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Retry)*multipiler))), retryStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Archived)*multipiler))), archivedStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Completed)*multipiler))), completedStyle)
+		d.Print(fmt.Sprintf(" %d", q.Size), baseStyle)
+		d.NL()
+	}
+	d.NL()
+	d.Print("active=", baseStyle)
+	d.Print(string(tick), activeStyle)
+	d.Print(" pending=", baseStyle)
+	d.Print(string(tick), pendingStyle)
+	d.Print(" aggregating=", baseStyle)
+	d.Print(string(tick), aggregatingStyle)
+	d.Print(" scheduled=", baseStyle)
+	d.Print(string(tick), scheduledStyle)
+	d.Print(" retry=", baseStyle)
+	d.Print(string(tick), retryStyle)
+	d.Print(" archived=", baseStyle)
+	d.Print(string(tick), archivedStyle)
+	d.Print(" completed=", baseStyle)
+	d.Print(string(tick), completedStyle)
+	d.NL()
+}
+
+func drawFooter(d *ScreenDrawer, state *State) {
+	if state.err != nil {
+		style := baseStyle.Background(tcell.ColorDarkRed)
+		d.Print(state.err.Error(), style)
+		d.FillLine(' ', style)
+		return
+	}
+	style := baseStyle.Background(tcell.ColorDarkSlateGray).Foreground(tcell.ColorWhite)
+	switch state.view {
+	case viewTypeHelp:
+		d.Print("<Esc>: GoBack", style)
+	default:
+		d.Print("<?>: Help    <Ctrl+C>: Exit ", style)
+	}
+	d.FillLine(' ', style)
+}
+
+// returns the maximum width from the given list of names
+func maxwidth(names []string) int {
+	max := 0
+	for _, s := range names {
+		if w := runewidth.StringWidth(s); w > max {
+			max = w
+		}
+	}
+	return max
+}
+
+// rpad adds padding to the right of a string.
+func rpad(s string, padding int) string {
+	tmpl := fmt.Sprintf("%%-%ds ", padding)
+	return fmt.Sprintf(tmpl, s)
+
+}
+
+// lpad adds padding to the left of a string.
+func lpad(s string, padding int) string {
+	tmpl := fmt.Sprintf("%%%ds ", padding)
+	return fmt.Sprintf(tmpl, s)
+}
+
+// byteCount converts the given bytes into human readable string
+func byteCount(b int64) string {
+	const unit = 1000
+	if b < unit {
+		return fmt.Sprintf("%d B", b)
+
+	}
+	div, exp := int64(unit), 0
+	for n := b / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+
+	}
+	return fmt.Sprintf("%.1f %cB", float64(b)/float64(div), "kMGTPE"[exp])
+}
+
+var queueColumnConfigs = []*columnConfig[*asynq.QueueInfo]{
+	{"Queue", alignLeft, func(q *asynq.QueueInfo) string { return q.Queue }},
+	{"State", alignLeft, func(q *asynq.QueueInfo) string { return formatQueueState(q) }},
+	{"Size", alignRight, func(q *asynq.QueueInfo) string { return strconv.Itoa(q.Size) }},
+	{"Latency", alignRight, func(q *asynq.QueueInfo) string { return q.Latency.Round(time.Second).String() }},
+	{"MemoryUsage", alignRight, func(q *asynq.QueueInfo) string { return byteCount(q.MemoryUsage) }},
+	{"Processed", alignRight, func(q *asynq.QueueInfo) string { return strconv.Itoa(q.Processed) }},
+	{"Failed", alignRight, func(q *asynq.QueueInfo) string { return strconv.Itoa(q.Failed) }},
+	{"ErrorRate", alignRight, func(q *asynq.QueueInfo) string { return formatErrorRate(q.Processed, q.Failed) }},
+}
+
+func formatQueueState(q *asynq.QueueInfo) string {
+	if q.Paused {
+		return "PAUSED"
+	}
+	return "RUN"
+}
+
+func formatErrorRate(processed, failed int) string {
+	if processed == 0 {
+		return "-"
+	}
+	return fmt.Sprintf("%.2f", float64(failed)/float64(processed))
+}
+
+func formatNextProcessTime(t time.Time) string {
+	now := time.Now()
+	if t.Before(now) {
+		return "now"
+	}
+	return fmt.Sprintf("in %v", (t.Sub(now).Round(time.Second)))
+}
+
+func formatPastTime(t time.Time) string {
+	now := time.Now()
+	if t.After(now) || t.Equal(now) {
+		return "just now"
+	}
+	return fmt.Sprintf("%v ago", time.Since(t).Round(time.Second))
+}
+
+func drawQueueTable(d *ScreenDrawer, style tcell.Style, state *State) {
+	drawTable(d, style, queueColumnConfigs, state.queues, state.queueTableRowIdx-1)
+}
+
+func drawQueueSummary(d *ScreenDrawer, state *State) {
+	q := state.selectedQueue
+	if q == nil {
+		d.Println("ERROR: Press q to go back", baseStyle)
+		return
+	}
+	d.Print("Name      ", labelStyle)
+	d.Println(q.Queue, baseStyle)
+	d.Print("Size      ", labelStyle)
+	d.Println(strconv.Itoa(q.Size), baseStyle)
+	d.Print("Latency   ", labelStyle)
+	d.Println(q.Latency.Round(time.Second).String(), baseStyle)
+	d.Print("MemUsage  ", labelStyle)
+	d.Println(byteCount(q.MemoryUsage), baseStyle)
+}
+
+// Returns the max number of groups that can be displayed.
+func groupPageSize(s tcell.Screen) int {
+	_, h := s.Size()
+	return h - 16 // height - (# of rows used)
+}
+
+// Returns the number of tasks to fetch.
+func taskPageSize(s tcell.Screen) int {
+	_, h := s.Size()
+	return h - 15 // height - (# of rows used)
+}
+
+func shouldShowGroupTable(state *State) bool {
+	return state.taskState == asynq.TaskStateAggregating && state.selectedGroup == nil
+}
+
+func getTaskTableColumnConfig(taskState asynq.TaskState) []*columnConfig[*asynq.TaskInfo] {
+	switch taskState {
+	case asynq.TaskStateActive:
+		return activeTaskTableColumns
+	case asynq.TaskStatePending:
+		return pendingTaskTableColumns
+	case asynq.TaskStateAggregating:
+		return aggregatingTaskTableColumns
+	case asynq.TaskStateScheduled:
+		return scheduledTaskTableColumns
+	case asynq.TaskStateRetry:
+		return retryTaskTableColumns
+	case asynq.TaskStateArchived:
+		return archivedTaskTableColumns
+	case asynq.TaskStateCompleted:
+		return completedTaskTableColumns
+	}
+	panic("unknown task state")
+}
+
+var activeTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retried", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.Retried) }},
+	{"Max Retry", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.MaxRetry) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var pendingTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retried", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.Retried) }},
+	{"Max Retry", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.MaxRetry) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var aggregatingTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+	{"Group", alignLeft, func(t *asynq.TaskInfo) string { return t.Group }},
+}
+
+var scheduledTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Next Process Time", alignLeft, func(t *asynq.TaskInfo) string {
+		return formatNextProcessTime(t.NextProcessAt)
+	}},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var retryTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retry", alignRight, func(t *asynq.TaskInfo) string { return fmt.Sprintf("%d/%d", t.Retried, t.MaxRetry) }},
+	{"Last Failure", alignLeft, func(t *asynq.TaskInfo) string { return t.LastErr }},
+	{"Last Failure Time", alignLeft, func(t *asynq.TaskInfo) string { return formatPastTime(t.LastFailedAt) }},
+	{"Next Process Time", alignLeft, func(t *asynq.TaskInfo) string {
+		return formatNextProcessTime(t.NextProcessAt)
+	}},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var archivedTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retry", alignRight, func(t *asynq.TaskInfo) string { return fmt.Sprintf("%d/%d", t.Retried, t.MaxRetry) }},
+	{"Last Failure", alignLeft, func(t *asynq.TaskInfo) string { return t.LastErr }},
+	{"Last Failure Time", alignLeft, func(t *asynq.TaskInfo) string { return formatPastTime(t.LastFailedAt) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var completedTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Completion Time", alignLeft, func(t *asynq.TaskInfo) string { return formatPastTime(t.CompletedAt) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+	{"Result", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Result) }},
+}
+
+func drawTaskTable(d *ScreenDrawer, state *State) {
+	if shouldShowGroupTable(state) {
+		drawGroupTable(d, state)
+		return
+	}
+	if len(state.tasks) == 0 {
+		return // print nothing
+	}
+	drawTable(d, baseStyle, getTaskTableColumnConfig(state.taskState), state.tasks, state.taskTableRowIdx-1)
+
+	// Pagination
+	pageSize := taskPageSize(d.Screen())
+	totalCount := getTaskCount(state.selectedQueue, state.taskState)
+	if state.taskState == asynq.TaskStateAggregating {
+		// aggregating tasks are scoped to each group when shown in the table.
+		totalCount = state.selectedGroup.Size
+	}
+	if pageSize < totalCount {
+		start := (state.pageNum-1)*pageSize + 1
+		end := start + len(state.tasks) - 1
+		paginationStyle := baseStyle.Foreground(tcell.ColorLightGray)
+		d.Print(fmt.Sprintf("Showing %d-%d out of %d", start, end, totalCount), paginationStyle)
+		if isNextTaskPageAvailable(d.Screen(), state) {
+			d.Print("  n=NextPage", paginationStyle)
+		}
+		if state.pageNum > 1 {
+			d.Print("  p=PrevPage", paginationStyle)
+		}
+		d.FillLine(' ', paginationStyle)
+	}
+}
+
+func isNextTaskPageAvailable(s tcell.Screen, state *State) bool {
+	totalCount := getTaskCount(state.selectedQueue, state.taskState)
+	end := (state.pageNum-1)*taskPageSize(s) + len(state.tasks)
+	return end < totalCount
+}
+
+func drawGroupTable(d *ScreenDrawer, state *State) {
+	if len(state.groups) == 0 {
+		return // print nothing
+	}
+	d.Println("<<< Select group >>>", baseStyle)
+	colConfigs := []*columnConfig[*asynq.GroupInfo]{
+		{"Name", alignLeft, func(g *asynq.GroupInfo) string { return g.Group }},
+		{"Size", alignRight, func(g *asynq.GroupInfo) string { return strconv.Itoa(g.Size) }},
+	}
+	// pagination
+	pageSize := groupPageSize(d.Screen())
+	total := len(state.groups)
+	start := (state.pageNum - 1) * pageSize
+	end := min(start+pageSize, total)
+	drawTable(d, baseStyle, colConfigs, state.groups[start:end], state.groupTableRowIdx-1)
+
+	if pageSize < total {
+		d.Print(fmt.Sprintf("Showing %d-%d out of %d", start+1, end, total), labelStyle)
+		if end < total {
+			d.Print("  n=NextPage", labelStyle)
+		}
+		if start > 0 {
+			d.Print("  p=PrevPage", labelStyle)
+		}
+	}
+	d.FillLine(' ', labelStyle)
+}
+
+type number interface {
+	int | int64 | float64
+}
+
+// min returns the smaller of x and y. if x==y, returns x
+func min[V number](x, y V) V {
+	if x > y {
+		return y
+	}
+	return x
+}
+
+// Define the order of states to show
+var taskStates = []asynq.TaskState{
+	asynq.TaskStateActive,
+	asynq.TaskStatePending,
+	asynq.TaskStateAggregating,
+	asynq.TaskStateScheduled,
+	asynq.TaskStateRetry,
+	asynq.TaskStateArchived,
+	asynq.TaskStateCompleted,
+}
+
+func nextTaskState(current asynq.TaskState) asynq.TaskState {
+	for i, ts := range taskStates {
+		if current == ts {
+			if i == len(taskStates)-1 {
+				return taskStates[0]
+			} else {
+				return taskStates[i+1]
+			}
+		}
+	}
+	panic("unkown task state")
+}
+
+func prevTaskState(current asynq.TaskState) asynq.TaskState {
+	for i, ts := range taskStates {
+		if current == ts {
+			if i == 0 {
+				return taskStates[len(taskStates)-1]
+			} else {
+				return taskStates[i-1]
+			}
+		}
+	}
+	panic("unkown task state")
+}
+
+func getTaskCount(queue *asynq.QueueInfo, taskState asynq.TaskState) int {
+	switch taskState {
+	case asynq.TaskStateActive:
+		return queue.Active
+	case asynq.TaskStatePending:
+		return queue.Pending
+	case asynq.TaskStateAggregating:
+		return queue.Aggregating
+	case asynq.TaskStateScheduled:
+		return queue.Scheduled
+	case asynq.TaskStateRetry:
+		return queue.Retry
+	case asynq.TaskStateArchived:
+		return queue.Archived
+	case asynq.TaskStateCompleted:
+		return queue.Completed
+	}
+	panic("unkonwn task state")
+}
+
+func drawTaskStateBreakdown(d *ScreenDrawer, style tcell.Style, state *State) {
+	const pad = "    " // padding between states
+	for _, ts := range taskStates {
+		s := style
+		if state.taskState == ts {
+			s = s.Bold(true).Underline(true)
+		}
+		d.Print(fmt.Sprintf("%s:%d", strings.Title(ts.String()), getTaskCount(state.selectedQueue, ts)), s)
+		d.Print(pad, style)
+	}
+	d.NL()
+}
+
+func drawTaskModal(d *ScreenDrawer, state *State) {
+	if state.taskID == "" {
+		return
+	}
+	task := state.selectedTask
+	if task == nil {
+		// task no longer found
+		fns := []func(d *modalRowDrawer){
+			func(d *modalRowDrawer) { d.Print("=== Task Info ===", baseStyle.Bold(true)) },
+			func(d *modalRowDrawer) { d.Print("", baseStyle) },
+			func(d *modalRowDrawer) {
+				d.Print(fmt.Sprintf("Task %q no longer exists", state.taskID), baseStyle)
+			},
+		}
+		withModal(d, fns)
+		return
+	}
+	fns := []func(d *modalRowDrawer){
+		func(d *modalRowDrawer) { d.Print("=== Task Info ===", baseStyle.Bold(true)) },
+		func(d *modalRowDrawer) { d.Print("", baseStyle) },
+		func(d *modalRowDrawer) {
+			d.Print("ID: ", labelStyle)
+			d.Print(task.ID, baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("Type: ", labelStyle)
+			d.Print(task.Type, baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("State: ", labelStyle)
+			d.Print(task.State.String(), baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("Queue: ", labelStyle)
+			d.Print(task.Queue, baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("Retry: ", labelStyle)
+			d.Print(fmt.Sprintf("%d/%d", task.Retried, task.MaxRetry), baseStyle)
+		},
+	}
+	if task.LastErr != "" {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Last Failure: ", labelStyle)
+			d.Print(task.LastErr, baseStyle)
+		})
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Last Failure Time: ", labelStyle)
+			d.Print(fmt.Sprintf("%v (%s)", task.LastFailedAt, formatPastTime(task.LastFailedAt)), baseStyle)
+		})
+	}
+	if !task.NextProcessAt.IsZero() {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Next Process Time: ", labelStyle)
+			d.Print(fmt.Sprintf("%v (%s)", task.NextProcessAt, formatNextProcessTime(task.NextProcessAt)), baseStyle)
+		})
+	}
+	if !task.CompletedAt.IsZero() {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Completion Time: ", labelStyle)
+			d.Print(fmt.Sprintf("%v (%s)", task.CompletedAt, formatPastTime(task.CompletedAt)), baseStyle)
+		})
+	}
+	fns = append(fns, func(d *modalRowDrawer) {
+		d.Print("Payload: ", labelStyle)
+		d.Print(formatByteSlice(task.Payload), baseStyle)
+	})
+	if task.Result != nil {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Result: ", labelStyle)
+			d.Print(formatByteSlice(task.Result), baseStyle)
+		})
+	}
+	withModal(d, fns)
+}
+
+// Reports whether the given byte slice is printable (i.e. human readable)
+func isPrintable(data []byte) bool {
+	if !utf8.Valid(data) {
+		return false
+	}
+	isAllSpace := true
+	for _, r := range string(data) {
+		if !unicode.IsGraphic(r) {
+			return false
+		}
+		if !unicode.IsSpace(r) {
+			isAllSpace = false
+		}
+	}
+	return !isAllSpace
+}
+
+func formatByteSlice(data []byte) string {
+	if data == nil {
+		return "<nil>"
+	}
+	if !isPrintable(data) {
+		return "<non-printable>"
+	}
+	return strings.ReplaceAll(string(data), "\n", "  ")
+}
+
+type modalRowDrawer struct {
+	d        *ScreenDrawer
+	width    int // current width occupied by content
+	maxWidth int
+}
+
+// Note: s should not include newline
+func (d *modalRowDrawer) Print(s string, style tcell.Style) {
+	if d.width >= d.maxWidth {
+		return // no longer write to this row
+	}
+	if d.width+runewidth.StringWidth(s) > d.maxWidth {
+		s = truncate(s, d.maxWidth-d.width)
+	}
+	d.d.Print(s, style)
+}
+
+// withModal draws a modal with the given functions row by row.
+func withModal(d *ScreenDrawer, rowPrintFns []func(d *modalRowDrawer)) {
+	w, h := d.Screen().Size()
+	var (
+		modalWidth  = int(math.Floor(float64(w) * 0.6))
+		modalHeight = int(math.Floor(float64(h) * 0.6))
+		rowOffset   = int(math.Floor(float64(h) * 0.2)) // 20% from the top
+		colOffset   = int(math.Floor(float64(w) * 0.2)) // 20% from the left
+	)
+	if modalHeight < 3 {
+		return // no content can be shown
+	}
+	d.Goto(colOffset, rowOffset)
+	d.Print(string(tcell.RuneULCorner), baseStyle)
+	d.Print(strings.Repeat(string(tcell.RuneHLine), modalWidth-2), baseStyle)
+	d.Print(string(tcell.RuneURCorner), baseStyle)
+	d.NL()
+	rowDrawer := modalRowDrawer{
+		d:        d,
+		width:    0,
+		maxWidth: modalWidth - 4, /* borders + paddings */
+	}
+	for i := 1; i < modalHeight-1; i++ {
+		d.Goto(colOffset, rowOffset+i)
+		d.Print(fmt.Sprintf("%c ", tcell.RuneVLine), baseStyle)
+		if i <= len(rowPrintFns) {
+			rowPrintFns[i-1](&rowDrawer)
+		}
+		d.FillUntil(' ', baseStyle, colOffset+modalWidth-2)
+		d.Print(fmt.Sprintf(" %c", tcell.RuneVLine), baseStyle)
+		d.NL()
+	}
+	d.Goto(colOffset, rowOffset+modalHeight-1)
+	d.Print(string(tcell.RuneLLCorner), baseStyle)
+	d.Print(strings.Repeat(string(tcell.RuneHLine), modalWidth-2), baseStyle)
+	d.Print(string(tcell.RuneLRCorner), baseStyle)
+	d.NL()
+}
+
+func adjustWidth(s string, width int) string {
+	sw := runewidth.StringWidth(s)
+	if sw > width {
+		return truncate(s, width)
+	}
+	var b strings.Builder
+	b.WriteString(s)
+	b.WriteString(strings.Repeat(" ", width-sw))
+	return b.String()
+}
+
+// truncates s if s exceeds max length.
+func truncate(s string, max int) string {
+	if runewidth.StringWidth(s) <= max {
+		return s
+	}
+	return string([]rune(s)[:max-1]) + "…"
+}
+
+func drawDebugInfo(d *ScreenDrawer, state *State) {
+	d.Println(state.DebugString(), baseStyle)
+}
+
+func drawHelp(d *ScreenDrawer) {
+	keyStyle := labelStyle.Bold(true)
+	withModal(d, []func(*modalRowDrawer){
+		func(d *modalRowDrawer) { d.Print("=== Help ===", baseStyle.Bold(true)) },
+		func(d *modalRowDrawer) { d.Print("", baseStyle) },
+		func(d *modalRowDrawer) {
+			d.Print("<Enter>", keyStyle)
+			d.Print("              to select", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<Esc>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<q>", keyStyle)
+			d.Print("         to go back", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<UpArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<k>", keyStyle)
+			d.Print("     to move up", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<DownArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<j>", keyStyle)
+			d.Print("   to move down", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<LeftArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<h>", keyStyle)
+			d.Print("   to move left", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<RightArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<l>", keyStyle)
+			d.Print("  to move right", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<Ctrl+C>", keyStyle)
+			d.Print("             to quit", baseStyle)
+		},
+	})
+}

tools/asynq/cmd/dash/draw_test.go

@@ -0,0 +1,33 @@
+// Copyright 2022 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 dash
+
+import "testing"
+
+func TestTruncate(t *testing.T) {
+	tests := []struct {
+		s    string
+		max  int
+		want string
+	}{
+		{
+			s:    "hello world!",
+			max:  15,
+			want: "hello world!",
+		},
+		{
+			s:    "hello world!",
+			max:  6,
+			want: "hello…",
+		},
+	}
+
+	for _, tc := range tests {
+		got := truncate(tc.s, tc.max)
+		if tc.want != got {
+			t.Errorf("truncate(%q, %d) = %q, want %q", tc.s, tc.max, got, tc.want)
+		}
+	}
+}

tools/asynq/cmd/dash/fetch.go

@@ -0,0 +1,185 @@
+// Copyright 2022 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 dash
+
+import (
+	"sort"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+)
+
+type fetcher interface {
+	// Fetch retries data required by the given state of the dashboard.
+	Fetch(state *State)
+}
+
+type dataFetcher struct {
+	inspector *asynq.Inspector
+	opts      Options
+	s         tcell.Screen
+
+	errorCh  chan<- error
+	queueCh  chan<- *asynq.QueueInfo
+	taskCh   chan<- *asynq.TaskInfo
+	queuesCh chan<- []*asynq.QueueInfo
+	groupsCh chan<- []*asynq.GroupInfo
+	tasksCh  chan<- []*asynq.TaskInfo
+}
+
+func (f *dataFetcher) Fetch(state *State) {
+	switch state.view {
+	case viewTypeQueues:
+		f.fetchQueues()
+	case viewTypeQueueDetails:
+		if shouldShowGroupTable(state) {
+			f.fetchGroups(state.selectedQueue.Queue)
+		} else if state.taskState == asynq.TaskStateAggregating {
+			f.fetchAggregatingTasks(state.selectedQueue.Queue, state.selectedGroup.Group, taskPageSize(f.s), state.pageNum)
+		} else {
+			f.fetchTasks(state.selectedQueue.Queue, state.taskState, taskPageSize(f.s), state.pageNum)
+		}
+		// if the task modal is open, additionally fetch the selected task's info
+		if state.taskID != "" {
+			f.fetchTaskInfo(state.selectedQueue.Queue, state.taskID)
+		}
+	}
+}
+
+func (f *dataFetcher) fetchQueues() {
+	var (
+		inspector = f.inspector
+		queuesCh  = f.queuesCh
+		errorCh   = f.errorCh
+		opts      = f.opts
+	)
+	go fetchQueues(inspector, queuesCh, errorCh, opts)
+}
+
+func fetchQueues(i *asynq.Inspector, queuesCh chan<- []*asynq.QueueInfo, errorCh chan<- error, opts Options) {
+	queues, err := i.Queues()
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	sort.Strings(queues)
+	var res []*asynq.QueueInfo
+	for _, q := range queues {
+		info, err := i.GetQueueInfo(q)
+		if err != nil {
+			errorCh <- err
+			return
+		}
+		res = append(res, info)
+	}
+	queuesCh <- res
+}
+
+func fetchQueueInfo(i *asynq.Inspector, qname string, queueCh chan<- *asynq.QueueInfo, errorCh chan<- error) {
+	q, err := i.GetQueueInfo(qname)
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	queueCh <- q
+}
+
+func (f *dataFetcher) fetchGroups(qname string) {
+	var (
+		i        = f.inspector
+		groupsCh = f.groupsCh
+		errorCh  = f.errorCh
+		queueCh  = f.queueCh
+	)
+	go fetchGroups(i, qname, groupsCh, errorCh)
+	go fetchQueueInfo(i, qname, queueCh, errorCh)
+}
+
+func fetchGroups(i *asynq.Inspector, qname string, groupsCh chan<- []*asynq.GroupInfo, errorCh chan<- error) {
+	groups, err := i.Groups(qname)
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	groupsCh <- groups
+}
+
+func (f *dataFetcher) fetchAggregatingTasks(qname, group string, pageSize, pageNum int) {
+	var (
+		i       = f.inspector
+		tasksCh = f.tasksCh
+		errorCh = f.errorCh
+		queueCh = f.queueCh
+	)
+	go fetchAggregatingTasks(i, qname, group, pageSize, pageNum, tasksCh, errorCh)
+	go fetchQueueInfo(i, qname, queueCh, errorCh)
+}
+
+func fetchAggregatingTasks(i *asynq.Inspector, qname, group string, pageSize, pageNum int,
+	tasksCh chan<- []*asynq.TaskInfo, errorCh chan<- error) {
+	tasks, err := i.ListAggregatingTasks(qname, group, asynq.PageSize(pageSize), asynq.Page(pageNum))
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	tasksCh <- tasks
+}
+
+func (f *dataFetcher) fetchTasks(qname string, taskState asynq.TaskState, pageSize, pageNum int) {
+	var (
+		i       = f.inspector
+		tasksCh = f.tasksCh
+		errorCh = f.errorCh
+		queueCh = f.queueCh
+	)
+	go fetchTasks(i, qname, taskState, pageSize, pageNum, tasksCh, errorCh)
+	go fetchQueueInfo(i, qname, queueCh, errorCh)
+}
+
+func fetchTasks(i *asynq.Inspector, qname string, taskState asynq.TaskState, pageSize, pageNum int,
+	tasksCh chan<- []*asynq.TaskInfo, errorCh chan<- error) {
+	var (
+		tasks []*asynq.TaskInfo
+		err   error
+	)
+	opts := []asynq.ListOption{asynq.PageSize(pageSize), asynq.Page(pageNum)}
+	switch taskState {
+	case asynq.TaskStateActive:
+		tasks, err = i.ListActiveTasks(qname, opts...)
+	case asynq.TaskStatePending:
+		tasks, err = i.ListPendingTasks(qname, opts...)
+	case asynq.TaskStateScheduled:
+		tasks, err = i.ListScheduledTasks(qname, opts...)
+	case asynq.TaskStateRetry:
+		tasks, err = i.ListRetryTasks(qname, opts...)
+	case asynq.TaskStateArchived:
+		tasks, err = i.ListArchivedTasks(qname, opts...)
+	case asynq.TaskStateCompleted:
+		tasks, err = i.ListCompletedTasks(qname, opts...)
+	}
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	tasksCh <- tasks
+}
+
+func (f *dataFetcher) fetchTaskInfo(qname, taskID string) {
+	var (
+		i       = f.inspector
+		taskCh  = f.taskCh
+		errorCh = f.errorCh
+	)
+	go fetchTaskInfo(i, qname, taskID, taskCh, errorCh)
+}
+
+func fetchTaskInfo(i *asynq.Inspector, qname, taskID string, taskCh chan<- *asynq.TaskInfo, errorCh chan<- error) {
+	info, err := i.GetTaskInfo(qname, taskID)
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	taskCh <- info
+}

tools/asynq/cmd/dash/key_event.go

@@ -0,0 +1,317 @@
+// Copyright 2022 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 dash
+
+import (
+	"os"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+)
+
+// keyEventHandler handles keyboard events and updates the state.
+// It delegates data fetching to fetcher and UI rendering to drawer.
+type keyEventHandler struct {
+	s     tcell.Screen
+	state *State
+	done  chan struct{}
+
+	fetcher fetcher
+	drawer  drawer
+
+	ticker       *time.Ticker
+	pollInterval time.Duration
+}
+
+func (h *keyEventHandler) quit() {
+	h.s.Fini()
+	close(h.done)
+	os.Exit(0)
+}
+
+func (h *keyEventHandler) HandleKeyEvent(ev *tcell.EventKey) {
+	if ev.Key() == tcell.KeyEscape || ev.Rune() == 'q' {
+		h.goBack() // Esc and 'q' key have "go back" semantics
+	} else if ev.Key() == tcell.KeyCtrlC {
+		h.quit()
+	} else if ev.Key() == tcell.KeyCtrlL {
+		h.s.Sync()
+	} else if ev.Key() == tcell.KeyDown || ev.Rune() == 'j' {
+		h.handleDownKey()
+	} else if ev.Key() == tcell.KeyUp || ev.Rune() == 'k' {
+		h.handleUpKey()
+	} else if ev.Key() == tcell.KeyRight || ev.Rune() == 'l' {
+		h.handleRightKey()
+	} else if ev.Key() == tcell.KeyLeft || ev.Rune() == 'h' {
+		h.handleLeftKey()
+	} else if ev.Key() == tcell.KeyEnter {
+		h.handleEnterKey()
+	} else if ev.Rune() == '?' {
+		h.showHelp()
+	} else if ev.Rune() == 'n' {
+		h.nextPage()
+	} else if ev.Rune() == 'p' {
+		h.prevPage()
+	}
+}
+
+func (h *keyEventHandler) goBack() {
+	var (
+		state = h.state
+		d     = h.drawer
+		f     = h.fetcher
+	)
+	if state.view == viewTypeHelp {
+		state.view = state.prevView // exit help
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	} else if state.view == viewTypeQueueDetails {
+		// if task modal is open close it; otherwise go back to the previous view
+		if state.taskID != "" {
+			state.taskID = ""
+			state.selectedTask = nil
+			d.Draw(state)
+		} else {
+			state.view = viewTypeQueues
+			f.Fetch(state)
+			h.resetTicker()
+			d.Draw(state)
+		}
+	} else {
+		h.quit()
+	}
+}
+
+func (h *keyEventHandler) handleDownKey() {
+	switch h.state.view {
+	case viewTypeQueues:
+		h.downKeyQueues()
+	case viewTypeQueueDetails:
+		h.downKeyQueueDetails()
+	}
+}
+
+func (h *keyEventHandler) downKeyQueues() {
+	if h.state.queueTableRowIdx < len(h.state.queues) {
+		h.state.queueTableRowIdx++
+	} else {
+		h.state.queueTableRowIdx = 0 // loop back
+	}
+	h.drawer.Draw(h.state)
+}
+
+func (h *keyEventHandler) downKeyQueueDetails() {
+	s, state := h.s, h.state
+	if shouldShowGroupTable(state) {
+		if state.groupTableRowIdx < groupPageSize(s) {
+			state.groupTableRowIdx++
+		} else {
+			state.groupTableRowIdx = 0 // loop back
+		}
+	} else if state.taskID == "" {
+		if state.taskTableRowIdx < len(state.tasks) {
+			state.taskTableRowIdx++
+		} else {
+			state.taskTableRowIdx = 0 // loop back
+		}
+	}
+	h.drawer.Draw(state)
+}
+
+func (h *keyEventHandler) handleUpKey() {
+	switch h.state.view {
+	case viewTypeQueues:
+		h.upKeyQueues()
+	case viewTypeQueueDetails:
+		h.upKeyQueueDetails()
+	}
+}
+
+func (h *keyEventHandler) upKeyQueues() {
+	state := h.state
+	if state.queueTableRowIdx == 0 {
+		state.queueTableRowIdx = len(state.queues)
+	} else {
+		state.queueTableRowIdx--
+	}
+	h.drawer.Draw(state)
+}
+
+func (h *keyEventHandler) upKeyQueueDetails() {
+	s, state := h.s, h.state
+	if shouldShowGroupTable(state) {
+		if state.groupTableRowIdx == 0 {
+			state.groupTableRowIdx = groupPageSize(s)
+		} else {
+			state.groupTableRowIdx--
+		}
+	} else if state.taskID == "" {
+		if state.taskTableRowIdx == 0 {
+			state.taskTableRowIdx = len(state.tasks)
+		} else {
+			state.taskTableRowIdx--
+		}
+	}
+	h.drawer.Draw(state)
+}
+
+func (h *keyEventHandler) handleEnterKey() {
+	switch h.state.view {
+	case viewTypeQueues:
+		h.enterKeyQueues()
+	case viewTypeQueueDetails:
+		h.enterKeyQueueDetails()
+	}
+}
+
+func (h *keyEventHandler) resetTicker() {
+	h.ticker.Reset(h.pollInterval)
+}
+
+func (h *keyEventHandler) enterKeyQueues() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.queueTableRowIdx != 0 {
+		state.selectedQueue = state.queues[state.queueTableRowIdx-1]
+		state.view = viewTypeQueueDetails
+		state.taskState = asynq.TaskStateActive
+		state.tasks = nil
+		state.pageNum = 1
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+}
+
+func (h *keyEventHandler) enterKeyQueueDetails() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if shouldShowGroupTable(state) && state.groupTableRowIdx != 0 {
+		state.selectedGroup = state.groups[state.groupTableRowIdx-1]
+		state.tasks = nil
+		state.pageNum = 1
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	} else if !shouldShowGroupTable(state) && state.taskTableRowIdx != 0 {
+		task := state.tasks[state.taskTableRowIdx-1]
+		state.selectedTask = task
+		state.taskID = task.ID
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+
+}
+
+func (h *keyEventHandler) handleLeftKey() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails && state.taskID == "" {
+		state.taskState = prevTaskState(state.taskState)
+		state.pageNum = 1
+		state.taskTableRowIdx = 0
+		state.tasks = nil
+		state.selectedGroup = nil
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+}
+
+func (h *keyEventHandler) handleRightKey() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails && state.taskID == "" {
+		state.taskState = nextTaskState(state.taskState)
+		state.pageNum = 1
+		state.taskTableRowIdx = 0
+		state.tasks = nil
+		state.selectedGroup = nil
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+}
+
+func (h *keyEventHandler) nextPage() {
+	var (
+		s     = h.s
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails {
+		if shouldShowGroupTable(state) {
+			pageSize := groupPageSize(s)
+			total := len(state.groups)
+			start := (state.pageNum - 1) * pageSize
+			end := start + pageSize
+			if end <= total {
+				state.pageNum++
+				d.Draw(state)
+			}
+		} else {
+			pageSize := taskPageSize(s)
+			totalCount := getTaskCount(state.selectedQueue, state.taskState)
+			if (state.pageNum-1)*pageSize+len(state.tasks) < totalCount {
+				state.pageNum++
+				f.Fetch(state)
+				h.resetTicker()
+			}
+		}
+	}
+}
+
+func (h *keyEventHandler) prevPage() {
+	var (
+		s     = h.s
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails {
+		if shouldShowGroupTable(state) {
+			pageSize := groupPageSize(s)
+			start := (state.pageNum - 1) * pageSize
+			if start > 0 {
+				state.pageNum--
+				d.Draw(state)
+			}
+		} else {
+			if state.pageNum > 1 {
+				state.pageNum--
+				f.Fetch(state)
+				h.resetTicker()
+			}
+		}
+	}
+}
+
+func (h *keyEventHandler) showHelp() {
+	var (
+		state = h.state
+		d     = h.drawer
+	)
+	if state.view != viewTypeHelp {
+		state.prevView = state.view
+		state.view = viewTypeHelp
+		d.Draw(state)
+	}
+}

tools/asynq/cmd/dash/key_event_test.go

@@ -0,0 +1,234 @@
+// Copyright 2022 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 dash
+
+import (
+	"testing"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/google/go-cmp/cmp"
+	"github.com/hibiken/asynq"
+)
+
+func makeKeyEventHandler(t *testing.T, state *State) *keyEventHandler {
+	ticker := time.NewTicker(time.Second)
+	t.Cleanup(func() { ticker.Stop() })
+	return &keyEventHandler{
+		s:            tcell.NewSimulationScreen("UTF-8"),
+		state:        state,
+		done:         make(chan struct{}),
+		fetcher:      &fakeFetcher{},
+		drawer:       &fakeDrawer{},
+		ticker:       ticker,
+		pollInterval: time.Second,
+	}
+}
+
+type keyEventHandlerTest struct {
+	desc      string            // test description
+	state     *State            // initial state, to be mutated by the handler
+	events    []*tcell.EventKey // keyboard events
+	wantState State             // expected state after the events
+}
+
+func TestKeyEventHandler(t *testing.T) {
+	tests := []*keyEventHandlerTest{
+		{
+			desc:      "navigates to help view",
+			state:     &State{view: viewTypeQueues},
+			events:    []*tcell.EventKey{tcell.NewEventKey(tcell.KeyRune, '?', tcell.ModNone)},
+			wantState: State{view: viewTypeHelp},
+		},
+		{
+			desc: "navigates to queue details view",
+			state: &State{
+				view: viewTypeQueues,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 100, Active: 10, Pending: 40, Scheduled: 40, Completed: 10},
+				},
+				queueTableRowIdx: 0,
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyRune, 'j', tcell.ModNone),   // down
+				tcell.NewEventKey(tcell.KeyEnter, '\n', tcell.ModNone), // Enter
+			},
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 100, Active: 10, Pending: 40, Scheduled: 40, Completed: 10},
+				},
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 100, Active: 10, Pending: 40, Scheduled: 40, Completed: 10},
+				queueTableRowIdx: 1,
+				taskState:        asynq.TaskStateActive,
+				pageNum:          1,
+			},
+		},
+		{
+			desc: "does nothing if no queues are present",
+			state: &State{
+				view:             viewTypeQueues,
+				queues:           []*asynq.QueueInfo{}, // empty
+				queueTableRowIdx: 0,
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyRune, 'j', tcell.ModNone),   // down
+				tcell.NewEventKey(tcell.KeyEnter, '\n', tcell.ModNone), // Enter
+			},
+			wantState: State{
+				view:             viewTypeQueues,
+				queues:           []*asynq.QueueInfo{},
+				queueTableRowIdx: 0,
+			},
+		},
+		{
+			desc: "opens task info modal",
+			state: &State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyEnter, '\n', tcell.ModNone), // Enter
+			},
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				// new states
+				taskID:       "yyyy",
+				selectedTask: &asynq.TaskInfo{ID: "yyyy", Type: "bar"},
+			},
+		},
+		{
+			desc: "Esc closes task info modal",
+			state: &State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "yyyy", // presence of this field opens the modal
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyEscape, ' ', tcell.ModNone), // Esc
+			},
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "", // this field should be unset
+			},
+		},
+		{
+			desc: "Arrow keys are disabled while task info modal is open",
+			state: &State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "yyyy", // presence of this field opens the modal
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyLeft, ' ', tcell.ModNone),
+			},
+
+			// no change
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "yyyy", // presence of this field opens the modal
+			},
+		},
+		// TODO: Add more tests
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.desc, func(t *testing.T) {
+			h := makeKeyEventHandler(t, tc.state)
+			for _, e := range tc.events {
+				h.HandleKeyEvent(e)
+			}
+			if diff := cmp.Diff(tc.wantState, *tc.state, cmp.AllowUnexported(State{})); diff != "" {
+				t.Errorf("after state was %+v, want %+v: (-want,+got)\n%s", *tc.state, tc.wantState, diff)
+			}
+		})
+	}
+
+}
+
+/*** fake implementation for tests ***/
+
+type fakeFetcher struct{}
+
+func (f *fakeFetcher) Fetch(s *State) {}
+
+type fakeDrawer struct{}
+
+func (d *fakeDrawer) Draw(s *State) {}

tools/asynq/cmd/dash/screen_drawer.go

@@ -0,0 +1,100 @@
+// Copyright 2022 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 dash
+
+import (
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/mattn/go-runewidth"
+)
+
+/*** Screen Drawer ***/
+
+// ScreenDrawer is used to draw contents on screen.
+//
+// Usage example:
+//    d := NewScreenDrawer(s)
+//    d.Println("Hello world", mystyle)
+//    d.NL() // adds newline
+//    d.Print("foo", mystyle.Bold(true))
+//    d.Print("bar", mystyle.Italic(true))
+type ScreenDrawer struct {
+	l *LineDrawer
+}
+
+func NewScreenDrawer(s tcell.Screen) *ScreenDrawer {
+	return &ScreenDrawer{l: NewLineDrawer(0, s)}
+}
+
+func (d *ScreenDrawer) Print(s string, style tcell.Style) {
+	d.l.Draw(s, style)
+}
+
+func (d *ScreenDrawer) Println(s string, style tcell.Style) {
+	d.Print(s, style)
+	d.NL()
+}
+
+// FillLine prints the given rune until the end of the current line
+// and adds a newline.
+func (d *ScreenDrawer) FillLine(r rune, style tcell.Style) {
+	w, _ := d.Screen().Size()
+	if w-d.l.col < 0 {
+		d.NL()
+		return
+	}
+	s := strings.Repeat(string(r), w-d.l.col)
+	d.Print(s, style)
+	d.NL()
+}
+
+func (d *ScreenDrawer) FillUntil(r rune, style tcell.Style, limit int) {
+	if d.l.col > limit {
+		return // already passed the limit
+	}
+	s := strings.Repeat(string(r), limit-d.l.col)
+	d.Print(s, style)
+}
+
+// NL adds a newline (i.e., moves to the next line).
+func (d *ScreenDrawer) NL() {
+	d.l.row++
+	d.l.col = 0
+}
+
+func (d *ScreenDrawer) Screen() tcell.Screen {
+	return d.l.s
+}
+
+// Goto moves the screendrawer to the specified cell.
+func (d *ScreenDrawer) Goto(x, y int) {
+	d.l.row = y
+	d.l.col = x
+}
+
+// Go to the bottom of the screen.
+func (d *ScreenDrawer) GoToBottom() {
+	_, h := d.Screen().Size()
+	d.l.row = h - 1
+	d.l.col = 0
+}
+
+type LineDrawer struct {
+	s   tcell.Screen
+	row int
+	col int
+}
+
+func NewLineDrawer(row int, s tcell.Screen) *LineDrawer {
+	return &LineDrawer{row: row, col: 0, s: s}
+}
+
+func (d *LineDrawer) Draw(s string, style tcell.Style) {
+	for _, r := range s {
+		d.s.SetContent(d.col, d.row, r, nil, style)
+		d.col += runewidth.RuneWidth(r)
+	}
+}

tools/asynq/cmd/dash/table.go

@@ -0,0 +1,70 @@
+// Copyright 2022 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 dash
+
+import (
+	"github.com/gdamore/tcell/v2"
+	"github.com/mattn/go-runewidth"
+)
+
+type columnAlignment int
+
+const (
+	alignRight columnAlignment = iota
+	alignLeft
+)
+
+type columnConfig[V any] struct {
+	name      string
+	alignment columnAlignment
+	displayFn func(v V) string
+}
+
+type column[V any] struct {
+	*columnConfig[V]
+	width int
+}
+
+// Helper to draw a table.
+func drawTable[V any](d *ScreenDrawer, style tcell.Style, configs []*columnConfig[V], data []V, highlightRowIdx int) {
+	const colBuffer = "    " // extra buffer between columns
+	cols := make([]*column[V], len(configs))
+	for i, cfg := range configs {
+		cols[i] = &column[V]{cfg, runewidth.StringWidth(cfg.name)}
+	}
+	// adjust the column width to accommodate the widest value.
+	for _, v := range data {
+		for _, col := range cols {
+			if w := runewidth.StringWidth(col.displayFn(v)); col.width < w {
+				col.width = w
+			}
+		}
+	}
+	// print header
+	headerStyle := style.Background(tcell.ColorDimGray).Foreground(tcell.ColorWhite)
+	for _, col := range cols {
+		if col.alignment == alignLeft {
+			d.Print(rpad(col.name, col.width)+colBuffer, headerStyle)
+		} else {
+			d.Print(lpad(col.name, col.width)+colBuffer, headerStyle)
+		}
+	}
+	d.FillLine(' ', headerStyle)
+	// print body
+	for i, v := range data {
+		rowStyle := style
+		if highlightRowIdx == i {
+			rowStyle = style.Background(tcell.ColorDarkOliveGreen)
+		}
+		for _, col := range cols {
+			if col.alignment == alignLeft {
+				d.Print(rpad(col.displayFn(v), col.width)+colBuffer, rowStyle)
+			} else {
+				d.Print(lpad(col.displayFn(v), col.width)+colBuffer, rowStyle)
+			}
+		}
+		d.FillLine(' ', rowStyle)
+	}
+}

tools/asynq/cmd/root.go

@@ -259,6 +259,12 @@ func rpad(s string, padding int) string {
 
 }
 
+// lpad adds padding to the left of a string.
+func lpad(s string, padding int) string {
+	tmpl := fmt.Sprintf("%%%ds ", padding)
+	return fmt.Sprintf(tmpl, s)
+}
+
 // indent indents the given text by given spaces.
 func indent(text string, space int) string {
 	if len(text) == 0 {

tools/go.mod

@@ -1,13 +1,16 @@
 module github.com/hibiken/asynq/tools
 
-go 1.13
+go 1.18
 
 require (
 	github.com/MakeNowJust/heredoc/v2 v2.0.1
 	github.com/fatih/color v1.9.0
+	github.com/gdamore/tcell/v2 v2.5.1
 	github.com/go-redis/redis/v8 v8.11.4
+	github.com/google/go-cmp v0.5.6
 	github.com/hibiken/asynq v0.23.0
 	github.com/hibiken/asynq/x v0.0.0-20220131170841-349f4c50fb1d
+	github.com/mattn/go-runewidth v0.0.13
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/prometheus/client_golang v1.11.0
 	github.com/spf13/cobra v1.1.1
@@ -15,3 +18,38 @@ require (
 	github.com/spf13/viper v1.7.0
 	golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136
 )
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/gdamore/encoding v1.0.0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/magiconair/properties v1.8.1 // indirect
+	github.com/mattn/go-colorable v0.1.4 // indirect
+	github.com/mattn/go-isatty v0.0.11 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/pelletier/go-toml v1.2.0 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/robfig/cron/v3 v3.0.1 // indirect
+	github.com/spf13/afero v1.1.2 // indirect
+	github.com/spf13/cast v1.3.1 // indirect
+	github.com/spf13/jwalterweatherman v1.0.0 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	golang.org/x/sys v0.0.0-20220318055525-2edf467146b5 // indirect
+	golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
+	google.golang.org/protobuf v1.26.0 // indirect
+	gopkg.in/ini.v1 v1.51.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

tools/go.sum

@@ -32,7 +32,6 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
@@ -59,6 +58,10 @@ github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell/v2 v2.5.1 h1:zc3LPdpK184lBW7syF2a5C6MV827KmErk9jGVnmsl/I=
+github.com/gdamore/tcell/v2 v2.5.1/go.mod h1:wSkrPaXoiIWZqW/g7Px4xc79di6FTcpB8tvaKJ6uGBo=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
@@ -169,6 +172,8 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
@@ -178,6 +183,8 @@ github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNx
 github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
 github.com/mattn/go-isatty v0.0.11 h1:FxPOTFNqGkuDUGi3H/qkUbQO4ZiBa2brKq5r0l8TGeM=
 github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
+github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
+github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
@@ -244,6 +251,8 @@ github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4O
 github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3xv4=
 github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
 github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
@@ -385,15 +394,19 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 h1:JWgyZ1qgdTaF3N3oxC+MdTV7qvEEgHo3otj+HB5CM7Q=
 golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220318055525-2edf467146b5 h1:saXMvIOKvRFwbOMicHXr0B1uwoxq9dGmLe5ExMES6c4=
+golang.org/x/sys v0.0.0-20220318055525-2edf467146b5/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf h1:MZ2shdL+ZM/XzY3ZGOnh4Nlpnxz5GSOhOmtHo3iPU6M=
+golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 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=