80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
package tunnel
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import (
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"os"
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"os/signal"
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"syscall"
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"time"
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)
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// waitForSignal notifies all routines to shutdownC immediately by closing the
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// shutdownC when one of the routines in main exits, or when this process receives
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// SIGTERM/SIGINT
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func waitForSignal(errC chan error, shutdownC chan struct{}) error {
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signals := make(chan os.Signal, 10)
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signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT)
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defer signal.Stop(signals)
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select {
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case err := <-errC:
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close(shutdownC)
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return err
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case <-signals:
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close(shutdownC)
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case <-shutdownC:
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}
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return nil
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}
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// waitForSignalWithGraceShutdown notifies all routines to shutdown immediately
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// by closing the shutdownC when one of the routines in main exits.
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// When this process recieves SIGTERM/SIGINT, it closes the graceShutdownC to
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// notify certain routines to start graceful shutdown. When grace period is over,
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// or when some routine exits, it notifies the rest of the routines to shutdown
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// immediately by closing shutdownC.
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// In the case of handling commands from Windows Service Manager, closing graceShutdownC
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// initiate graceful shutdown.
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func waitForSignalWithGraceShutdown(errC chan error,
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shutdownC, graceShutdownC chan struct{},
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gracePeriod time.Duration,
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) error {
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signals := make(chan os.Signal, 10)
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signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT)
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defer signal.Stop(signals)
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select {
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case err := <-errC:
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close(graceShutdownC)
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close(shutdownC)
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return err
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case <-signals:
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close(graceShutdownC)
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waitForGracePeriod(signals, errC, shutdownC, gracePeriod)
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case <-graceShutdownC:
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waitForGracePeriod(signals, errC, shutdownC, gracePeriod)
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case <-shutdownC:
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close(graceShutdownC)
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}
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return nil
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}
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func waitForGracePeriod(signals chan os.Signal,
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errC chan error,
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shutdownC chan struct{},
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gracePeriod time.Duration,
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) {
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logger.Infof("Initiating graceful shutdown...")
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// Unregister signal handler early, so the client can send a second SIGTERM/SIGINT
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// to force shutdown cloudflared
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signal.Stop(signals)
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graceTimerTick := time.Tick(gracePeriod)
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// send close signal via shutdownC when grace period expires or when an
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// error is encountered.
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select {
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case <-graceTimerTick:
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case <-errC:
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}
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close(shutdownC)
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}
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