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shutdown.go
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shutdown.go
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/*
@Date: 2021/11/10 16:12
@Author: yvanz
@File : shutdown
*/
package apiserver
import (
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/yvanz/gin-tmpl/pkg/logger"
)
const (
wrapUpTime = time.Second
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)
}
func gracefulStop(signals chan os.Signal) {
signal.Stop(signals)
logger.Info("got signal SIGTERM, shutting down...")
wrapUpListeners.notifyListeners()
time.Sleep(wrapUpTime)
shutdownListeners.notifyListeners()
time.Sleep(delayTimeBeforeForceQuit - wrapUpTime)
logger.Infof("still alive after %v, going to force kill the process...", delayTimeBeforeForceQuit)
_ = syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
}
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()
for _, listener := range lm.listeners {
listener()
}
}