1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
// Copyright 2016 Google LLC. All Rights Reserved.
//
// 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 util holds utility functions.
package util
import (
"context"
"os"
"os/signal"
"syscall"
"k8s.io/klog/v2"
)
// AwaitSignal waits for standard termination signals, then runs the given
// function. Can early return if the passed in context is canceled, in which
// case the function is not run.
func AwaitSignal(ctx context.Context, doneFn func()) {
// Subscribe for the standard set of signals used to terminate a server.
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
defer signal.Stop(sigs)
// Wait for a signal or context cancellation.
select {
case sig := <-sigs:
klog.Warningf("Signal received: %v", sig)
doneFn()
case <-ctx.Done():
klog.Infof("AwaitSignal canceled: %v", ctx.Err())
}
}
|