kubernetes signal 源码
kubernetes signal 代码
文件路径：/staging/src/k8s.io/apiserver/pkg/server/signal.go
/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package server
import (
"context"
"os"
"os/signal"
)
var onlyOneSignalHandler = make(chan struct{})
var shutdownHandler chan os.Signal
// SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
// which is closed on one of these signals. If a second signal is caught, the program
// is terminated with exit code 1.
// Only one of SetupSignalContext and SetupSignalHandler should be called, and only can
// be called once.
func SetupSignalHandler() <-chan struct{} {
return SetupSignalContext().Done()
}
// SetupSignalContext is same as SetupSignalHandler, but a context.Context is returned.
// Only one of SetupSignalContext and SetupSignalHandler should be called, and only can
// be called once.
func SetupSignalContext() context.Context {
close(onlyOneSignalHandler) // panics when called twice
shutdownHandler = make(chan os.Signal, 2)
ctx, cancel := context.WithCancel(context.Background())
signal.Notify(shutdownHandler, shutdownSignals...)
go func() {
<-shutdownHandler
cancel()
<-shutdownHandler
os.Exit(1) // second signal. Exit directly.
}()
return ctx
}
// RequestShutdown emulates a received event that is considered as shutdown signal (SIGTERM/SIGINT)
// This returns whether a handler was notified
func RequestShutdown() bool {
if shutdownHandler != nil {
select {
case shutdownHandler <- shutdownSignals[0]:
return true
default:
}
}
return false
}
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