66 lines
1.5 KiB
Go
66 lines
1.5 KiB
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/moby/buildkit/util/bklog"
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"github.com/pkg/errors"
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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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initContexts()
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return appContext
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}
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// Shutdown returns a static context that closes when multiple interrupt signals
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// have been received to indicate a faster shutdown. Useful in CLI tools.
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func Shutdown() context.Context {
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initContexts()
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return shutdownContext
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}
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var (
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appContext context.Context
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shutdownContext context.Context
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initContextsOnce sync.Once
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)
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func initContexts() {
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initContextsOnce.Do(func() {
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signals := make(chan os.Signal, 2048)
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signal.Notify(signals, terminationSignals...)
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ctx := context.Background()
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for _, f := range inits {
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ctx = f(ctx) //nolint:fatcontext
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}
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ctx, cancel := context.WithCancelCause(ctx)
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appContext = ctx //nolint:fatcontext
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shutdownCtx, shutdownCancel := context.WithCancelCause(context.Background())
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shutdownContext = shutdownCtx
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// We just allow this goroutine to be orphaned since program termination
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// will clean it up.
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go func() {
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<-signals
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err := errors.New("got SIGTERM/SIGINT, forcing shutdown")
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cancel(err)
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<-signals
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err = errors.New("got 2 SIGTERM/SIGINTs, skipping shutdown")
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shutdownCancel(err)
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<-signals
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err = errors.New("got 3 SIGTERM/SIGINTs, forcibly terminating")
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bklog.G(ctx).Fatal(err.Error())
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}()
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})
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}
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