Example #1
0
func pruneShuttleBackends(configStore *config.Store, env, shuttleAddr string) {
	if client == nil {
		return
	}

	config, err := client.GetConfig()
	if err != nil {
		log.Errorf("ERROR: Unable to get shuttle config: %s", err)
		return
	}

	registrations, err := configStore.ListRegistrations(env)
	if err != nil {
		log.Errorf("ERROR: Unable to list registrations: %s", err)
		return
	}

	// FIXME: THERE SHOULD HAVE BEEN AN ERROR IF `len(registrations) == 0` IS WRONG!
	if len(registrations) == 0 {
		// If there are no registrations, skip pruning it because we might be in a bad state and
		// don't want to inadvertently unregister everything.  Shuttle will handle the down
		// nodes if they are really down.
		return
	}

	for _, service := range config.Services {

		app, err := configStore.GetApp(service.Name, env)
		if err != nil {
			log.Errorf("ERROR: Unable to load app %s: %s", app, err)
			continue
		}

		pools, err := configStore.ListAssignedPools(env, service.Name)
		if err != nil {
			log.Errorf("ERROR: Unable to list pool assignments for %s: %s", service.Name, err)
			continue
		}

		if app == nil || len(pools) == 0 {
			err := client.RemoveService(service.Name)
			if err != nil {
				log.Errorf("ERROR: Unable to remove service %s from shuttle: %s", service.Name, err)
			}
			log.Printf("Unregisterred shuttle service %s", service.Name)
			continue
		}

		for _, backend := range service.Backends {
			backendExists := false
			for _, r := range registrations {
				if backend.Name == r.ContainerID[0:12] {
					backendExists = true
					break
				}
			}

			if !backendExists {
				err := client.RemoveBackend(service.Name, backend.Name)
				if err != nil {
					log.Errorf("ERROR: Unable to remove backend %s from shuttle: %s", backend.Name, err)
				}
				log.Printf("Unregisterred shuttle backend %s", backend.Name)
			}
		}
	}
}