go-utils/common/runner.go

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package common
import (
"errors"
"os"
"os/signal"
"time"
)
var ErrTimeOut = errors.New("执行者执行超时")
var ErrInterrupt = errors.New("执行者被中断")
//一个执行者,可以执行任何任务,但是这些任务是限制完成的,
//该执行者可以通过发送终止信号终止它
type Runner struct {
tasks []func(int) //要执行的任务
complete chan error //用于通知任务全部完成
timeout <-chan time.Time //这些任务在多久内完成
interrupt chan os.Signal //可以控制强制终止的信号
}
func NewRunner(tm time.Duration) *Runner {
return &Runner{
complete: make(chan error),
timeout: time.After(tm),
interrupt: make(chan os.Signal, 1),
}
}
//将需要执行的任务添加到Runner里
func (r *Runner) Add(tasks ...func(int)) {
r.tasks = append(r.tasks, tasks...)
}
//执行任务,执行的过程中接收到中断信号时,返回中断错误
//如果任务全部执行完还没有接收到中断信号则返回nil
func (r *Runner) run() error {
for id, task := range r.tasks {
if r.isInterrupt() {
return ErrInterrupt
}
task(id)
}
return nil
}
//检查是否接收到了中断信号
func (r *Runner) isInterrupt() bool {
select {
case <-r.interrupt:
signal.Stop(r.interrupt)
return true
default:
return false
}
}
//开始执行所有任务,并且监视通道事件
func (r *Runner) Start() error {
//希望接收哪些系统信号
signal.Notify(r.interrupt, os.Interrupt)
go func() {
r.complete <- r.run()
}()
select {
case err := <-r.complete:
return err
case <-r.timeout:
return ErrTimeOut
}
}