[BUG] yurt-iot-dock concurrent conflicts when exiting reclaim

[wangxye]

What happened:
Since the reclaim logic uses the same context as the delete reconcile logic, extreme concurrency can occur where yurt-iot-dock exits and deletes the device /device profile/ device service in edgex together.

What you expected to happen:
yurt-iot-dock cannot actively delete resources from an existing edgex in the reclaim logic

Anything else we need to know?:

var onlyOneSignalHandler = make(chan struct{})
var shutdownSignals = []os.Signal{syscall.SIGTERM}

func SetupSignalHandler(client client.Client, opts *options.YurtIoTDockOptions) context.Context {
	close(onlyOneSignalHandler) // panics when called twice

	ctx, cancel := context.WithCancel(context.Background())
	setupLog.Info("[SetupSignalHandler] shutdown controller with crd")
	c := make(chan os.Signal, 2)
	signal.Notify(c, shutdownSignals...)
	go func() {
		<-c
		setupLog.Info("[SetupSignalHandler] shutdown signal concur")
		deleteCRsOnControllerShutdown(ctx, client, opts)
		cancel()
		<-c
		os.Exit(1) // second signal. Exit directly.
	}()

	return ctx
}

Environment:

• OpenYurt version: v1.4.0

others

/kind bug

[wangxye]

/assign