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dash.go
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dash.go
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// 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/awanganddong/asynq"
"github.com/gdamore/tcell/v2"
)
// 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
RedisConnOpt asynq.RedisConnOpt
}
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(opts.RedisConnOpt)
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)
}
}
}