Function NewServerService

cmd/tempo/app/server_service.go:139–175

NewServerService constructs service from Server component. servicesToWaitFor is called when server is stopping, and should return all services that need to terminate before server actually stops. N.B.: this function is NOT Cortex specific, please let's keep it that way. Passed server should not reac

(serv *server.Server, servicesToWaitFor func() []services.Service)

// N.B.: this function is NOT Cortex specific, please let's keep it that way.
// Passed server should not react on signals. Early return from Run function is considered to be an error.
func NewServerService(serv *server.Server, servicesToWaitFor func() []services.Service) services.Service {
	serverDone := make(chan error, 1)

	runFn := func(ctx context.Context) error {
		go func() {
			defer close(serverDone)
			serverDone <- serv.Run()
		}()

		select {
		case <-ctx.Done():
			return nil
		case err := <-serverDone:
			if err != nil {
				return err
			}
			return fmt.Errorf("server stopped unexpectedly")
		}
	}

	stoppingFn := func(_ error) error {
		// wait until all modules are done, and then shutdown server.
		for _, s := range servicesToWaitFor() {
			_ = s.AwaitTerminated(context.Background())
		}

		// shutdown HTTP and gRPC servers (this also unblocks Run)
		serv.Shutdown()

		// if not closed yet, wait until server stops.
		<-serverDone
		level.Info(util_log.Logger).Log("msg", "server stopped")
		return nil
	}

	return services.NewBasicService(nil, runFn, stoppingFn)
}

// DisableSignalHandling puts a dummy signal handler
func DisableSignalHandling(config *server.Config) {