alertmanager-irc-relay/context.go
Luca Bigliardi 4d0f1f26b0 Graceful disconnect upon context cancel
Make sure the underlying library context cancellation happens only
after the session has been shutdown.

Signed-off-by: Luca Bigliardi <shammash@google.com>
2021-03-27 17:29:54 +01:00

51 lines
1.2 KiB
Go

// Copyright 2021 Google LLC
//
// 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
//
// https://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 main
import (
"context"
"log"
"os"
"os/signal"
"sync"
)
func WithSignal(ctx context.Context, s ...os.Signal) (context.Context, context.CancelFunc) {
sigCtx, cancel := context.WithCancel(ctx)
c := make(chan os.Signal, 1)
signal.Notify(c, s...)
go func() {
select {
case <-c:
log.Printf("Received %s, exiting", s)
cancel()
case <-ctx.Done():
cancel()
}
signal.Stop(c)
}()
return sigCtx, cancel
}
func WithWaitGroup(ctx context.Context, wg *sync.WaitGroup) context.Context {
wgCtx, cancel := context.WithCancel(context.Background())
go func() {
<-ctx.Done()
wg.Wait()
cancel()
}()
return wgCtx
}