Golang shutdown.Exit函數代碼示例

func runVolumeDestroy(args *docopt.Args) error {
	if os.Getuid() != 0 {
		fmt.Println("this command requires root!\ntry again with `sudo flynn-host destroy-volumes`.")
		shutdown.ExitWithCode(1)
	}

	volPath := args.String["--volpath"]
	includeData := args.Bool["--include-data"]
	keepSystemImages := args.Bool["--keep-system-images"]

	volumeDBPath := filepath.Join(volPath, "volumes.bolt")

	// if there is no state db, nothing to do
	if _, err := os.Stat(volumeDBPath); err != nil && os.IsNotExist(err) {
		fmt.Printf("no volume state db exists at %q; already clean.\n", volumeDBPath)
		shutdown.Exit()
	}

	// open state db.  we're maybe using it; and regardless want to flock before removing it
	vman, vmanErr := loadVolumeState(volumeDBPath)

	// if '--include-data' specified and vman loaded, destroy volumes
	allVolumesDestroyed := true
	if vmanErr != nil {
		fmt.Printf("%s\n", vmanErr)
	} else if includeData == false {
		fmt.Println("'--include-data' not specified; leaving backend data storage intact.")
	} else {
		if err := destroyVolumes(vman, keepSystemImages); err != nil {
			fmt.Printf("%s\n", err)
			allVolumesDestroyed = false
		}
	}

	if !keepSystemImages {
		// remove db file
		if err := os.Remove(volumeDBPath); err != nil {
			fmt.Printf("could not remove volume state db file %q: %s.\n", volumeDBPath, err)
			shutdown.ExitWithCode(5)
		}
		fmt.Printf("state db file %q removed.\n", volumeDBPath)
	}

	// exit code depends on if all volumes were destroyed successfully or not
	if includeData && !allVolumesDestroyed {
		shutdown.ExitWithCode(6)
	}
	shutdown.Exit()
	return nil
}

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 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() {
	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()

	usage := `
usage: flynn-blobstore <command> [<args>...]

Commands:
        help        show usage for a specific command
        cleanup     delete file blobs from default backend 
        migrate     move file blobs from default backend to a different backend
        server      run blobstore HTTP server

See 'flynn-blobstore help <command>' for more information on a specific command.
`[1:]
	args, _ := docopt.Parse(usage, nil, true, version.String(), true)

	cmd := args.String["<command>"]
	cmdArgs := args.All["<args>"].([]string)

	if cmd == "help" {
		if len(cmdArgs) == 0 { // `flynn-blobstore help`
			fmt.Println(usage)
			return
		} else { // `flynn-blobstore help <command>`
			cmd = cmdArgs[0]
			cmdArgs = []string{"--help"}
		}
	}

	if err := runCommand(cmd, cmdArgs); err != nil {
		log.Println(err)
		shutdown.ExitWithCode(1)
	}
}

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))
}

/*
	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()

	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() {
	defer shutdown.Exit()

	// Initialize main program and execute.
	m := NewMain()
	if err := m.Run(os.Args[1:]...); err != nil {
		fmt.Fprintln(m.Stderr, err.Error())
		os.Exit(1)
	}

	// Wait indefinitely.
	<-(chan struct{})(nil)
}

func main() {
	defer shutdown.Exit()
	runner := &Runner{
		bc:       args.BootConfig,
		events:   make(chan Event),
		networks: make(map[string]struct{}),
		buildCh:  make(chan struct{}, maxConcurrentBuilds),
		clusters: make(map[string]*cluster.Cluster),
		ircMsgs:  make(chan string),
	}
	if err := runner.start(); err != nil {
		shutdown.Fatal(err)
	}
}

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()

	conf := ServerConfig{
		SyslogAddr:  *logAddr,
		ApiAddr:     *apiAddr,
		Discoverd:   discoverd.DefaultClient,
		ServiceName: "logaggregator",
	}

	srv := NewServer(conf)
	shutdown.BeforeExit(srv.Shutdown)

	// get leader for snapshot (if any)
	leader, err := conf.Discoverd.Service(conf.ServiceName).Leader()
	if err == nil {
		host, _, _ := net.SplitHostPort(leader.Addr)
		log15.Info("loading snapshot from leader", "leader", host)

		c, _ := client.New("http://" + host)
		snapshot, err := c.GetSnapshot()
		if err == nil {
			if err := srv.LoadSnapshot(snapshot); err != nil {
				log15.Error("error receiving snapshot from leader", "error", err)
			}
			snapshot.Close()
		} else {
			log15.Error("error getting snapshot from leader", "error", err)
		}
	} else {
		log15.Info("error finding leader for snapshot", "error", err)
	}

	if err := srv.Start(); err != nil {
		shutdown.Fatal(err)
	}
	<-make(chan struct{})
}

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")
	snapshotPath := flag.String("snapshot", "", "snapshot path")
	flag.Parse()

	a := NewAggregator(*logAddr)

	if *snapshotPath != "" {
		if err := a.ReplaySnapshot(*snapshotPath); err != nil {
			shutdown.Fatal(err)
		}

		shutdown.BeforeExit(func() {
			if err := a.TakeSnapshot(*snapshotPath); err != nil {
				log15.Error("snapshot error", "err", err)
			}
		})
	}

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

	listener, err := net.Listen("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() {
	defer shutdown.Exit()

	flag.Parse()

	addr := os.Getenv("PORT")
	if addr == "" {
		addr = *listenPort
	}
	addr = ":" + addr

	var fs Filesystem
	var storageDesc string

	if *storageDir != "" {
		fs = NewOSFilesystem(*storageDir)
		storageDesc = *storageDir
	} else {
		var err error
		db := postgres.Wait(nil, nil)
		fs, err = NewPostgresFilesystem(db)
		if err != nil {
			shutdown.Fatal(err)
		}
		storageDesc = "Postgres"
	}

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

	log.Println("Blobstore serving files on " + addr + " from " + storageDesc)

	mux := http.NewServeMux()
	mux.Handle("/", handler(fs))
	mux.Handle(status.Path, status.Handler(fs.Status))

	h := httphelper.ContextInjector("blobstore", httphelper.NewRequestLogger(mux))
	shutdown.Fatal(http.ListenAndServe(addr, h))
}

func main() {
	defer shutdown.Exit()

	flag.Parse()

	addr := os.Getenv("PORT")
	if addr == "" {
		addr = *listenPort
	}
	addr = ":" + addr

	var fs Filesystem
	var storageDesc string

	if *storageDir != "" {
		fs = NewOSFilesystem(*storageDir)
		storageDesc = *storageDir
	} else {
		db, err := postgres.Open("", "")
		if err != nil {
			shutdown.Fatal(err)
		}
		fs, err = NewPostgresFilesystem(db.DB)
		if err != nil {
			shutdown.Fatal(err)
		}
		storageDesc = "Postgres"
	}

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

	log.Println("Blobstore serving files on " + addr + " from " + storageDesc)

	http.Handle("/", handler(fs))
	status.AddHandler(fs.Status)

	shutdown.Fatal(http.ListenAndServe(addr, nil))
}