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shutdown.go
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shutdown.go
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//go:build linux || darwin
package proc
import (
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/userzhangjinlong/go-zero/core/logx"
"github.com/userzhangjinlong/go-zero/core/threading"
)
const (
wrapUpTime = time.Second
// why we use 5500 milliseconds is because most of our queue are blocking mode with 5 seconds
waitTime = 5500 * time.Millisecond
)
var (
wrapUpListeners = new(listenerManager)
shutdownListeners = new(listenerManager)
delayTimeBeforeForceQuit = waitTime
)
// AddShutdownListener adds fn as a shutdown listener.
// The returned func can be used to wait for fn getting called.
func AddShutdownListener(fn func()) (waitForCalled func()) {
return shutdownListeners.addListener(fn)
}
// AddWrapUpListener adds fn as a wrap up listener.
// The returned func can be used to wait for fn getting called.
func AddWrapUpListener(fn func()) (waitForCalled func()) {
return wrapUpListeners.addListener(fn)
}
// SetTimeToForceQuit sets the waiting time before force quitting.
func SetTimeToForceQuit(duration time.Duration) {
delayTimeBeforeForceQuit = duration
}
// Shutdown calls the registered shutdown listeners, only for test purpose.
func Shutdown() {
shutdownListeners.notifyListeners()
}
// WrapUp wraps up the process, only for test purpose.
func WrapUp() {
wrapUpListeners.notifyListeners()
}
func gracefulStop(signals chan os.Signal, sig syscall.Signal) {
signal.Stop(signals)
logx.Infof("Got signal %d, shutting down...", sig)
go wrapUpListeners.notifyListeners()
time.Sleep(wrapUpTime)
go shutdownListeners.notifyListeners()
time.Sleep(delayTimeBeforeForceQuit - wrapUpTime)
logx.Infof("Still alive after %v, going to force kill the process...", delayTimeBeforeForceQuit)
_ = syscall.Kill(syscall.Getpid(), sig)
}
type listenerManager struct {
lock sync.Mutex
waitGroup sync.WaitGroup
listeners []func()
}
func (lm *listenerManager) addListener(fn func()) (waitForCalled func()) {
lm.waitGroup.Add(1)
lm.lock.Lock()
lm.listeners = append(lm.listeners, func() {
defer lm.waitGroup.Done()
fn()
})
lm.lock.Unlock()
return func() {
lm.waitGroup.Wait()
}
}
func (lm *listenerManager) notifyListeners() {
lm.lock.Lock()
defer lm.lock.Unlock()
group := threading.NewRoutineGroup()
for _, listener := range lm.listeners {
group.RunSafe(listener)
}
group.Wait()
lm.listeners = nil
}