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package matugen
import (
"context"
"errors"
"sync"
"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
)
type Result struct {
Success bool
Error error
}
type QueuedJob struct {
Options Options
Done chan Result
Ctx context.Context
Cancel context.CancelFunc
}
type Queue struct {
mu sync.Mutex
current *QueuedJob
pending *QueuedJob
jobDone chan struct{}
}
var globalQueue *Queue
var queueOnce sync.Once
func GetQueue() *Queue {
queueOnce.Do(func() {
globalQueue = &Queue{
jobDone: make(chan struct{}, 1),
}
})
return globalQueue
}
func (q *Queue) Submit(opts Options) <-chan Result {
result := make(chan Result, 1)
ctx, cancel := context.WithCancel(context.Background())
job := &QueuedJob{
Options: opts,
Done: result,
Ctx: ctx,
Cancel: cancel,
}
q.mu.Lock()
if q.pending != nil {
log.Info("Cancelling pending theme request")
q.pending.Cancel()
q.pending.Done <- Result{Success: false, Error: context.Canceled}
close(q.pending.Done)
}
if q.current != nil {
q.pending = job
q.mu.Unlock()
log.Info("Theme request queued (worker running)")
return result
}
q.current = job
q.mu.Unlock()
go q.runWorker()
return result
}
func (q *Queue) runWorker() {
for {
q.mu.Lock()
job := q.current
if job == nil {
q.mu.Unlock()
return
}
q.mu.Unlock()
select {
case <-job.Ctx.Done():
q.finishJob(Result{Success: false, Error: context.Canceled})
continue
default:
}
log.Infof("Processing theme: %s %s (%s)", job.Options.Kind, job.Options.Value, job.Options.Mode)
err := Run(job.Options)
var result Result
switch {
case err == nil:
result = Result{Success: true}
case errors.Is(err, ErrNoChanges):
result = Result{Success: true}
default:
result = Result{Success: false, Error: err}
}
q.finishJob(result)
}
}
func (q *Queue) finishJob(result Result) {
q.mu.Lock()
defer q.mu.Unlock()
if q.current != nil {
select {
case q.current.Done <- result:
default:
}
close(q.current.Done)
}
q.current = q.pending
q.pending = nil
if q.current == nil {
select {
case q.jobDone <- struct{}{}:
default:
}
}
}
func (q *Queue) IsRunning() bool {
q.mu.Lock()
defer q.mu.Unlock()
return q.current != nil
}
func (q *Queue) HasPending() bool {
q.mu.Lock()
defer q.mu.Unlock()
return q.pending != nil
}
|