Golang shutdown.Fatal函數代碼示例

/*
	ish: the Inexusable/Insecure/Internet SHell.
*/
func main() {
	defer shutdown.Exit()

	name := os.Getenv("NAME")
	port := os.Getenv("PORT")
	addr := ":" + port
	if name == "" {
		name = "ish-service"
	}

	l, err := net.Listen("tcp", addr)
	if err != nil {
		shutdown.Fatal(err)
	}
	defer l.Close()

	hb, err := discoverd.AddServiceAndRegister(name, addr)
	if err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(func() { hb.Close() })

	http.HandleFunc("/ish", ish)
	if err := http.Serve(l, nil); err != nil {
		shutdown.Fatal(err)
	}
}

func main() {
	logger := log15.New("component", "scheduler")
	logger.SetHandler(log15.LvlFilterHandler(log15.LvlInfo, log15.StdoutHandler))
	log := logger.New("fn", "main")

	log.Info("creating cluster and controller clients")
	hc := &http.Client{Timeout: 5 * time.Second}
	clusterClient := utils.ClusterClientWrapper(cluster.NewClientWithHTTP(nil, hc))
	controllerClient, err := controller.NewClient("", os.Getenv("AUTH_KEY"))
	if err != nil {
		log.Error("error creating controller client", "err", err)
		shutdown.Fatal(err)
	}

	log.Info("waiting for controller API to come up")
	if _, err := discoverd.GetInstances("controller", 5*time.Minute); err != nil {
		log.Error("error waiting for controller API", "err", err)
		shutdown.Fatal(err)
	}

	s := NewScheduler(clusterClient, controllerClient, newDiscoverdWrapper(logger), logger)
	log.Info("started scheduler", "backoffPeriod", s.backoffPeriod)

	go s.startHTTPServer(os.Getenv("PORT"))

	if err := s.Run(); err != nil {
		shutdown.Fatal(err)
	}
	shutdown.Exit()
}

func main() {
	defer shutdown.Exit()

	db := postgres.Wait(&postgres.Conf{
		Service:  serviceName,
		User:     "flynn",
		Password: os.Getenv("PGPASSWORD"),
		Database: "postgres",
	}, nil)
	api := &pgAPI{db}

	router := httprouter.New()
	router.POST("/databases", httphelper.WrapHandler(api.createDatabase))
	router.DELETE("/databases", httphelper.WrapHandler(api.dropDatabase))
	router.GET("/ping", httphelper.WrapHandler(api.ping))

	port := os.Getenv("PORT")
	if port == "" {
		port = "3000"
	}
	addr := ":" + port

	hb, err := discoverd.AddServiceAndRegister(serviceName+"-api", addr)
	if err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(func() { hb.Close() })

	handler := httphelper.ContextInjector(serviceName+"-api", httphelper.NewRequestLogger(router))
	shutdown.Fatal(http.ListenAndServe(addr, handler))
}

func (h *jobAPI) ConfigureNetworking(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	log := h.host.log.New("fn", "ConfigureNetworking")

	log.Info("decoding config")
	config := &host.NetworkConfig{}
	if err := httphelper.DecodeJSON(r, config); err != nil {
		log.Error("error decoding config", "err", err)
		shutdown.Fatal(err)
	}

	// configure the network before returning a response in case the
	// network coordinator requires the bridge to be created (e.g.
	// when using flannel with the "alloc" backend)
	h.host.networkOnce.Do(func() {
		log.Info("configuring network", "subnet", config.Subnet, "mtu", config.MTU, "resolvers", config.Resolvers)
		if err := h.host.backend.ConfigureNetworking(config); err != nil {
			log.Error("error configuring network", "err", err)
			shutdown.Fatal(err)
		}

		h.host.statusMtx.Lock()
		h.host.status.Network = config
		h.host.statusMtx.Unlock()
	})
}

func main() {
	defer shutdown.Exit()

	dsn := &mariadb.DSN{
		Host:     serviceHost + ":3306",
		User:     "flynn",
		Password: os.Getenv("MYSQL_PWD"),
		Database: "mysql",
	}
	db, err := sql.Open("mysql", dsn.String())
	api := &API{db}

	router := httprouter.New()
	router.POST("/databases", httphelper.WrapHandler(api.createDatabase))
	router.DELETE("/databases", httphelper.WrapHandler(api.dropDatabase))
	router.GET("/ping", httphelper.WrapHandler(api.ping))

	port := os.Getenv("PORT")
	if port == "" {
		port = "3000"
	}
	addr := ":" + port

	hb, err := discoverd.AddServiceAndRegister(serviceName+"-api", addr)
	if err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(func() { hb.Close() })

	handler := httphelper.ContextInjector(serviceName+"-api", httphelper.NewRequestLogger(router))
	shutdown.Fatal(http.ListenAndServe(addr, handler))
}

func main() {
	defer shutdown.Exit()

	api := &API{}

	router := httprouter.New()
	router.POST("/databases", api.createDatabase)
	router.DELETE("/databases", api.dropDatabase)
	router.GET("/ping", api.ping)

	port := os.Getenv("PORT")
	if port == "" {
		port = "3000"
	}
	addr := ":" + port

	hb, err := discoverd.AddServiceAndRegister(serviceName+"-api", addr)
	if err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(func() { hb.Close() })

	handler := httphelper.ContextInjector(serviceName+"-api", httphelper.NewRequestLogger(router))
	shutdown.Fatal(http.ListenAndServe(addr, handler))
}

func main() {
	serviceName := os.Getenv("FLYNN_POSTGRES")
	if serviceName == "" {
		serviceName = "postgres"
	}
	singleton := os.Getenv("SINGLETON") == "true"
	password := os.Getenv("PGPASSWORD")

	const dataDir = "/data"
	idFile := filepath.Join(dataDir, "instance_id")
	idBytes, err := ioutil.ReadFile(idFile)
	if err != nil && !os.IsNotExist(err) {
		shutdown.Fatalf("error reading instance ID: %s", err)
	}
	id := string(idBytes)
	if len(id) == 0 {
		id = random.UUID()
		if err := ioutil.WriteFile(idFile, []byte(id), 0644); err != nil {
			shutdown.Fatalf("error writing instance ID: %s", err)
		}
	}

	err = discoverd.DefaultClient.AddService(serviceName, &discoverd.ServiceConfig{
		LeaderType: discoverd.LeaderTypeManual,
	})
	if err != nil && !httphelper.IsObjectExistsError(err) {
		shutdown.Fatal(err)
	}
	inst := &discoverd.Instance{
		Addr: ":5432",
		Meta: map[string]string{pgIdKey: id},
	}
	hb, err := discoverd.DefaultClient.RegisterInstance(serviceName, inst)
	if err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(func() { hb.Close() })

	log := log15.New("app", "postgres")

	pg := NewPostgres(Config{
		ID:           id,
		Singleton:    singleton,
		DataDir:      filepath.Join(dataDir, "db"),
		BinDir:       "/usr/lib/postgresql/9.5/bin/",
		Password:     password,
		Logger:       log.New("component", "postgres"),
		ExtWhitelist: true,
		WaitUpstream: true,
		SHMType:      "posix",
	})
	dd := sd.NewDiscoverd(discoverd.DefaultClient.Service(serviceName), log.New("component", "discoverd"))

	peer := state.NewPeer(inst, id, pgIdKey, singleton, dd, pg, log.New("component", "peer"))
	shutdown.BeforeExit(func() { peer.Close() })

	go peer.Run()
	shutdown.Fatal(ServeHTTP(pg.(*Postgres), peer, hb, log.New("component", "http")))
	// TODO(titanous): clean shutdown of postgres
}

func main() {
	defer shutdown.Exit()

	apiPort := os.Getenv("PORT")
	if apiPort == "" {
		apiPort = "5000"
	}

	logAddr := flag.String("logaddr", ":3000", "syslog input listen address")
	apiAddr := flag.String("apiaddr", ":"+apiPort, "api listen address")
	flag.Parse()

	a := NewAggregator(*logAddr)
	if err := a.Start(); err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(a.Shutdown)

	listener, err := reuseport.NewReusablePortListener("tcp4", *apiAddr)
	if err != nil {
		shutdown.Fatal(err)
	}

	hb, err := discoverd.AddServiceAndRegister("flynn-logaggregator", *logAddr)
	if err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(func() { hb.Close() })

	shutdown.Fatal(http.Serve(listener, apiHandler(a)))
}

func main() {
	m := NewMain()
	if err := m.ParseFlags(os.Args[1:]); err != nil {
		shutdown.Fatal(err)
	}

	if err := m.Run(); err != nil {
		shutdown.Fatal(err)
	}
	<-(chan struct{})(nil)
}

func main() {
	defer shutdown.Exit()

	grohl.AddContext("app", "controller-scheduler")
	grohl.Log(grohl.Data{"at": "start"})

	go startHTTPServer()

	if period := os.Getenv("BACKOFF_PERIOD"); period != "" {
		var err error
		backoffPeriod, err = time.ParseDuration(period)
		if err != nil {
			shutdown.Fatal(err)
		}
		grohl.Log(grohl.Data{"at": "backoff_period", "period": backoffPeriod.String()})
	}

	cc, err := controller.NewClient("", os.Getenv("AUTH_KEY"))
	if err != nil {
		shutdown.Fatal(err)
	}
	c := newContext(cc, cluster.NewClient())

	c.watchHosts()

	grohl.Log(grohl.Data{"at": "leaderwait"})
	hb, err := discoverd.AddServiceAndRegister("controller-scheduler", ":"+os.Getenv("PORT"))
	if err != nil {
		shutdown.Fatal(err)
	}
	shutdown.BeforeExit(func() { hb.Close() })

	leaders := make(chan *discoverd.Instance)
	stream, err := discoverd.NewService("controller-scheduler").Leaders(leaders)
	if err != nil {
		shutdown.Fatal(err)
	}
	for leader := range leaders {
		if leader.Addr == hb.Addr() {
			break
		}
	}
	if err := stream.Err(); err != nil {
		// TODO: handle discoverd errors
		shutdown.Fatal(err)
	}
	stream.Close()
	// TODO: handle demotion

	grohl.Log(grohl.Data{"at": "leader"})

	// TODO: periodic full cluster sync for anti-entropy
	c.watchFormations()
}

func main() {
	log := logger.New("fn", "main")

	log.Info("creating controller client")
	client, err := controller.NewClient("", os.Getenv("AUTH_KEY"))
	if err != nil {
		log.Error("error creating controller client", "err", err)
		shutdown.Fatal(err)
	}

	log.Info("connecting to postgres")
	db := postgres.Wait(nil, schema.PrepareStatements)

	shutdown.BeforeExit(func() { db.Close() })

	go func() {
		status.AddHandler(func() status.Status {
			_, err := db.ConnPool.Exec("ping")
			if err != nil {
				return status.Unhealthy
			}
			return status.Healthy
		})
		addr := ":" + os.Getenv("PORT")
		hb, err := discoverd.AddServiceAndRegister("controller-worker", addr)
		if err != nil {
			shutdown.Fatal(err)
		}
		shutdown.BeforeExit(func() { hb.Close() })
		shutdown.Fatal(http.ListenAndServe(addr, nil))
	}()

	workers := que.NewWorkerPool(
		que.NewClient(db.ConnPool),
		que.WorkMap{
			"deployment":             deployment.JobHandler(db, client, logger),
			"app_deletion":           app_deletion.JobHandler(db, client, logger),
			"domain_migration":       domain_migration.JobHandler(db, client, logger),
			"release_cleanup":        release_cleanup.JobHandler(db, client, logger),
			"app_garbage_collection": app_garbage_collection.JobHandler(db, client, logger),
		},
		workerCount,
	)
	workers.Interval = 5 * time.Second

	log.Info("starting workers", "count", workerCount, "interval", workers.Interval)
	workers.Start()
	shutdown.BeforeExit(func() { workers.Shutdown() })

	select {} // block and keep running
}

func (h *jobAPI) ConfigureNetworking(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	config := &host.NetworkConfig{}
	if err := httphelper.DecodeJSON(r, config); err != nil {
		shutdown.Fatal(err)
	}

	go h.networkOnce.Do(func() {
		if err := h.host.backend.ConfigureNetworking(config); err != nil {
			shutdown.Fatal(err)
		}

		h.statusMtx.Lock()
		h.status.Network = config
		h.statusMtx.Unlock()
	})
}

func (d *DiscoverdManager) ConnectLocal(url string) error {
	if d.localConnected() {
		return errors.New("host: discoverd is already configured")
	}
	disc := discoverd.NewClientWithURL(url)
	hb, err := disc.AddServiceAndRegisterInstance("flynn-host", d.inst)
	if err != nil {
		return err
	}

	d.mtx.Lock()
	if d.peer != nil {
		d.peer.Close()
	}
	d.local = hb
	d.mtx.Unlock()

	d.backend.SetDefaultEnv("DISCOVERD", url)

	go func() {
		if err := d.mux.Connect(disc, "flynn-logaggregator"); err != nil {
			shutdown.Fatal(err)
		}
	}()

	return nil
}

func (h *Host) ConfigureDiscoverd(config *host.DiscoverdConfig) {
	log := h.log.New("fn", "ConfigureDiscoverd")

	if config.JobID != "" {
		log.Info("persisting discoverd job_id", "job.id", config.JobID)
		if err := h.state.SetPersistentSlot("discoverd", config.JobID); err != nil {
			log.Error("error assigning discoverd to persistent slot")
		}
	}

	if config.URL != "" && config.DNS != "" {
		go h.discoverdOnce.Do(func() {
			log.Info("connecting to service discovery", "url", config.URL)
			if err := h.discMan.ConnectLocal(config.URL); err != nil {
				log.Error("error connecting to service discovery", "err", err)
				shutdown.Fatal(err)
			}
		})
	}

	h.statusMtx.Lock()
	h.status.Discoverd = config
	h.backend.SetDiscoverdConfig(h.status.Discoverd)
	h.statusMtx.Unlock()

	if config.URL != "" {
		h.volAPI.ConfigureClusterClient(config.URL)
	}
}

func (h *jobAPI) ConfigureDiscoverd(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	log := h.host.log.New("fn", "ConfigureDiscoverd")

	log.Info("decoding config")
	var config host.DiscoverdConfig
	if err := httphelper.DecodeJSON(r, &config); err != nil {
		log.Error("error decoding config", "err", err)
		httphelper.Error(w, err)
		return
	}
	log.Info("config decoded", "url", config.URL, "dns", config.DNS)

	h.host.statusMtx.Lock()
	h.host.status.Discoverd = &config
	h.host.statusMtx.Unlock()

	if config.URL != "" && config.DNS != "" {
		go h.host.discoverdOnce.Do(func() {
			log.Info("connecting to service discovery", "url", config.URL)
			if err := h.host.discMan.ConnectLocal(config.URL); err != nil {
				log.Error("error connecting to service discovery", "err", err)
				shutdown.Fatal(err)
			}
		})
	}
}