mirror of https://github.com/docker/cli.git
45 lines
802 B
Go
45 lines
802 B
Go
package appcontext
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import (
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"context"
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"os"
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"os/signal"
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"sync"
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"github.com/sirupsen/logrus"
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)
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var (
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appContextCache context.Context
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appContextOnce sync.Once
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)
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// Context returns a static context that reacts to termination signals of the
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// running process. Useful in CLI tools.
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func Context() context.Context {
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appContextOnce.Do(func() {
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signals := make(chan os.Signal, 2048)
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signal.Notify(signals, terminationSignals...)
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const exitLimit = 3
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retries := 0
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ctx := context.Background()
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ctx, cancel := context.WithCancel(ctx)
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appContextCache = ctx
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go func() {
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for {
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<-signals
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cancel()
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retries++
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if retries >= exitLimit {
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logrus.Errorf("got %d SIGTERM/SIGINTs, forcing shutdown", retries)
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os.Exit(1)
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}
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}
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}()
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})
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return appContextCache
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}
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