50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
package svc
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import (
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"context"
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"errors"
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"git.yuntuo.hk/k2safe/go-omni/task"
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"sync/atomic"
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"time"
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)
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type BackgroundState struct {
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Stop, Drain, Release, Started chan struct{}
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Wrote atomic.Bool
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Future *task.Future
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}
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var Background atomic.Pointer[BackgroundState]
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func initBackground(c *ServiceContext) error {
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state := &BackgroundState{Stop: make(chan struct{}), Drain: make(chan struct{}), Release: make(chan struct{}), Started: make(chan struct{})}
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baseline := Closed.Load()
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runner, err := task.New(task.Config{Workers: 1, QueueSize: 1, TaskTimeout: time.Minute, OnError: func(string, error) {}})
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if err != nil {
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return err
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}
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c.OnStop("jobs", func(ctx context.Context) error { close(state.Stop); return runner.StopAccepting(ctx) })
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c.OnDrain("jobs", func(ctx context.Context) error { close(state.Drain); return runner.Wait(ctx) })
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state.Future, err = runner.Submit(c.WorkContext(), "finish", func(ctx context.Context) error {
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close(state.Started)
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if c.Config.BackgroundMode == "auto" {
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<-state.Stop
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} else {
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<-state.Release
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}
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if ctx.Err() != nil {
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return ctx.Err()
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}
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if Closed.Load() != baseline {
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return errors.New("shared client closed before background write")
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}
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state.Wrote.Store(true)
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return nil
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})
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if err == nil {
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<-state.Started
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}
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Background.Store(state)
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return err
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}
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