mirror of https://github.com/dapr/kit.git
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
/*
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Copyright 2023 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package signals
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import (
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"context"
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"errors"
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"os"
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"os/signal"
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"github.com/dapr/kit/logger"
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)
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var (
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log = logger.NewLogger("dapr.signals")
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// Inspired by
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// https://github.com/kubernetes-sigs/controller-runtime/blob/8499b67e316a03b260c73f92d0380de8cd2e97a1/pkg/manager/signals/signal.go#L25
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onlyOneSignalHandler = make(chan struct{})
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)
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// Context returns a context which will be canceled when either the SIGINT
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// (windows and non windows) or SIGTERM (non windows) signal is caught. If
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// either signal is caught a second time, the program is terminated immediately
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// with exit code 1.
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func Context() context.Context {
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// panics when called twice
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close(onlyOneSignalHandler)
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ctx, cancel := context.WithCancelCause(context.Background())
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sigCh := make(chan os.Signal, 1)
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signal.Notify(sigCh, shutdownSignals...)
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go func() {
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sig := <-sigCh
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log.Infof(`Received signal '%s'; beginning shutdown`, sig)
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//nolint:err113
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cancel(errors.New("cancelling context, received signal " + sig.String()))
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sig = <-sigCh
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log.Fatalf(
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`Received signal '%s' during shutdown; exiting immediately`,
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sig,
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)
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}()
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return ctx
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}
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