func NewService(cfg *config.Wrapper, myID protocol.DeviceID, mdl Model, tlsCfg *tls.Config, discoverer discover.Finder,
	bepProtocolName string, tlsDefaultCommonName string, lans []*net.IPNet) *Service {

	service := &Service{
		Supervisor: suture.New("connections.Service", suture.Spec{
			Log: func(line string) {
				l.Infoln(line)
			},
		}),
		cfg:                  cfg,
		myID:                 myID,
		model:                mdl,
		tlsCfg:               tlsCfg,
		discoverer:           discoverer,
		conns:                make(chan internalConn),
		bepProtocolName:      bepProtocolName,
		tlsDefaultCommonName: tlsDefaultCommonName,
		lans:                 lans,
		limiter:              newLimiter(cfg),
		natService:           nat.NewService(myID, cfg),

		listenersMut:   sync.NewRWMutex(),
		listeners:      make(map[string]genericListener),
		listenerTokens: make(map[string]suture.ServiceToken),

		// A listener can fail twice, rapidly. Any more than that and it
		// will be put on suspension for ten minutes. Restarts and changes
		// due to config are done by removing and adding services, so are
		// not subject to these limitations.
		listenerSupervisor: suture.New("c.S.listenerSupervisor", suture.Spec{
			Log: func(line string) {
				l.Infoln(line)
			},
			FailureThreshold: 2,
			FailureBackoff:   600 * time.Second,
		}),

		curConMut:         sync.NewMutex(),
		currentConnection: make(map[protocol.DeviceID]completeConn),
	}
	cfg.Subscribe(service)

	// There are several moving parts here; one routine per listening address
	// (handled in configuration changing) to handle incoming connections,
	// one routine to periodically attempt outgoing connections, one routine to
	// the the common handling regardless of whether the connection was
	// incoming or outgoing.

	service.Add(serviceFunc(service.connect))
	service.Add(serviceFunc(service.handle))
	service.Add(service.listenerSupervisor)

	raw := cfg.RawCopy()
	// Actually starts the listeners and NAT service
	service.CommitConfiguration(raw, raw)

	return service
}

func NewMulticast(addr string) *Multicast {
	m := &Multicast{
		Supervisor: suture.New("multicastBeacon", suture.Spec{
			// Don't retry too frenetically: an error to open a socket or
			// whatever is usually something that is either permanent or takes
			// a while to get solved...
			FailureThreshold: 2,
			FailureBackoff:   60 * time.Second,
			// Only log restarts in debug mode.
			Log: func(line string) {
				l.Debugln(line)
			},
		}),
		inbox:  make(chan []byte),
		outbox: make(chan recv, 16),
	}

	m.mr = &multicastReader{
		addr:   addr,
		outbox: m.outbox,
		stop:   make(chan struct{}),
	}
	m.Add(m.mr)

	m.mw = &multicastWriter{
		addr:  addr,
		inbox: m.inbox,
		stop:  make(chan struct{}),
	}
	m.Add(m.mw)

	return m
}

func NewBroadcast(port int) *Broadcast {
	b := &Broadcast{
		Supervisor: suture.New("broadcastBeacon", suture.Spec{
			// Don't retry too frenetically: an error to open a socket or
			// whatever is usually something that is either permanent or takes
			// a while to get solved...
			FailureThreshold: 2,
			FailureBackoff:   60 * time.Second,
			// Only log restarts in debug mode.
			Log: func(line string) {
				if debug {
					l.Debugln(line)
				}
			},
		}),
		port:   port,
		inbox:  make(chan []byte),
		outbox: make(chan recv, 16),
	}

	b.br = &broadcastReader{
		port:   port,
		outbox: b.outbox,
	}
	b.Add(b.br)
	b.bw = &broadcastWriter{
		port:  port,
		inbox: b.inbox,
	}
	b.Add(b.bw)

	return b
}

// Creates a new Panamax instnace. Alocates memotry and loads a new supervisor
// instance to hold the Containers.
func NewPanamax(cache *gocache.Cache) (*Panamax, error) {
	var p *Panamax = &Panamax{
		Supervisor: suture.New("Panamax", suture.Spec{
			Log: func(line string) { log.Println("[SUTURE]", line) },
		}),
		containers:   make(map[string]*Container),
		checks:       make(map[string]*Container),
		checkLastRun: make(map[string]int64),
		cache:        cache,
	}

	// letting the Supervisor run in background right from the start, it will be
	// requested to be on running state when onboarding containers
	go p.ServeBackground()

	return p, nil
}

func NewSvc(cfg *config.Wrapper, tlsCfg *tls.Config) *Svc {
	conns := make(chan *tls.Conn)

	svc := &Svc{
		Supervisor: suture.New("Svc", suture.Spec{
			Log: func(log string) {
				if debug {
					l.Debugln(log)
				}
			},
			FailureBackoff:   5 * time.Minute,
			FailureDecay:     float64((10 * time.Minute) / time.Second),
			FailureThreshold: 5,
		}),
		cfg:    cfg,
		tlsCfg: tlsCfg,

		tokens:      make(map[string]suture.ServiceToken),
		clients:     make(map[string]*client.ProtocolClient),
		mut:         sync.NewRWMutex(),
		invitations: make(chan protocol.SessionInvitation),
		conns:       conns,
	}

	rcfg := cfg.Raw()
	svc.CommitConfiguration(rcfg, rcfg)
	cfg.Subscribe(svc)

	receiver := &invitationReceiver{
		tlsCfg:      tlsCfg,
		conns:       conns,
		invitations: svc.invitations,
		stop:        make(chan struct{}),
	}

	eventBc := &eventBroadcaster{
		svc: svc,
	}

	svc.Add(receiver)
	svc.Add(eventBc)

	return svc
}

// NewModel creates and starts a new model. The model starts in read-only mode,
// where it sends index information to connected peers and responds to requests
// for file data without altering the local folder in any way.
func NewModel(cfg *config.Wrapper, id protocol.DeviceID, deviceName, clientName, clientVersion string, ldb *leveldb.DB) *Model {
	m := &Model{
		Supervisor: suture.New("model", suture.Spec{
			Log: func(line string) {
				if debug {
					l.Debugln(line)
				}
			},
		}),
		cfg:                cfg,
		db:                 ldb,
		finder:             db.NewBlockFinder(ldb, cfg),
		progressEmitter:    NewProgressEmitter(cfg),
		id:                 id,
		shortID:            id.Short(),
		deviceName:         deviceName,
		clientName:         clientName,
		clientVersion:      clientVersion,
		folderCfgs:         make(map[string]config.FolderConfiguration),
		folderFiles:        make(map[string]*db.FileSet),
		folderDevices:      make(map[string][]protocol.DeviceID),
		deviceFolders:      make(map[protocol.DeviceID][]string),
		deviceStatRefs:     make(map[protocol.DeviceID]*stats.DeviceStatisticsReference),
		folderIgnores:      make(map[string]*ignore.Matcher),
		folderRunners:      make(map[string]service),
		folderStatRefs:     make(map[string]*stats.FolderStatisticsReference),
		protoConn:          make(map[protocol.DeviceID]protocol.Connection),
		rawConn:            make(map[protocol.DeviceID]io.Closer),
		deviceVer:          make(map[protocol.DeviceID]string),
		reqValidationCache: make(map[string]time.Time),

		fmut:  sync.NewRWMutex(),
		pmut:  sync.NewRWMutex(),
		rvmut: sync.NewRWMutex(),
	}
	if cfg.Options().ProgressUpdateIntervalS > -1 {
		go m.progressEmitter.Serve()
	}

	return m
}

func syncthingMain() {
	// Create a main service manager. We'll add things to this as we go along.
	// We want any logging it does to go through our log system.
	mainSvc := suture.New("main", suture.Spec{
		Log: func(line string) {
			if debugSuture {
				l.Debugln(line)
			}
		},
	})
	mainSvc.ServeBackground()

	// Set a log prefix similar to the ID we will have later on, or early log
	// lines look ugly.
	l.SetPrefix("[start] ")

	if auditEnabled {
		startAuditing(mainSvc)
	}

	if verbose {
		mainSvc.Add(newVerboseSvc())
	}

	// Event subscription for the API; must start early to catch the early events.
	apiSub := events.NewBufferedSubscription(events.Default.Subscribe(events.AllEvents), 1000)

	if len(os.Getenv("GOMAXPROCS")) == 0 {
		runtime.GOMAXPROCS(runtime.NumCPU())
	}

	// Ensure that that we have a certificate and key.
	cert, err := tls.LoadX509KeyPair(locations[locCertFile], locations[locKeyFile])
	if err != nil {
		cert, err = newCertificate(locations[locCertFile], locations[locKeyFile], tlsDefaultCommonName)
		if err != nil {
			l.Fatalln("load cert:", err)
		}
	}

	// We reinitialize the predictable RNG with our device ID, to get a
	// sequence that is always the same but unique to this syncthing instance.
	predictableRandom.Seed(seedFromBytes(cert.Certificate[0]))

	myID = protocol.NewDeviceID(cert.Certificate[0])
	l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))

	l.Infoln(LongVersion)
	l.Infoln("My ID:", myID)

	// Emit the Starting event, now that we know who we are.

	events.Default.Log(events.Starting, map[string]string{
		"home": baseDirs["config"],
		"myID": myID.String(),
	})

	// Prepare to be able to save configuration

	cfgFile := locations[locConfigFile]

	var myName string

	// Load the configuration file, if it exists.
	// If it does not, create a template.

	if info, err := os.Stat(cfgFile); err == nil {
		if !info.Mode().IsRegular() {
			l.Fatalln("Config file is not a file?")
		}
		cfg, err = config.Load(cfgFile, myID)
		if err == nil {
			myCfg := cfg.Devices()[myID]
			if myCfg.Name == "" {
				myName, _ = os.Hostname()
			} else {
				myName = myCfg.Name
			}
		} else {
			l.Fatalln("Configuration:", err)
		}
	} else {
		l.Infoln("No config file; starting with empty defaults")
		myName, _ = os.Hostname()
		newCfg := defaultConfig(myName)
		cfg = config.Wrap(cfgFile, newCfg)
		cfg.Save()
		l.Infof("Edit %s to taste or use the GUI\n", cfgFile)
	}

	if cfg.Raw().OriginalVersion != config.CurrentVersion {
		l.Infoln("Archiving a copy of old config file format")
		// Archive a copy
		osutil.Rename(cfgFile, cfgFile+fmt.Sprintf(".v%d", cfg.Raw().OriginalVersion))
		// Save the new version
		cfg.Save()
	}

	if err := checkShortIDs(cfg); err != nil {
		l.Fatalln("Short device IDs are in conflict. Unlucky!\n  Regenerate the device ID of one if the following:\n  ", err)
//.........这里部分代码省略.........

func syncthingMain() {
	// Create a main service manager. We'll add things to this as we go along.
	// We want any logging it does to go through our log system.
	mainSvc := suture.New("main", suture.Spec{
		Log: func(line string) {
			l.Debugln(line)
		},
	})
	mainSvc.ServeBackground()

	// Set a log prefix similar to the ID we will have later on, or early log
	// lines look ugly.
	l.SetPrefix("[start] ")

	if auditEnabled {
		startAuditing(mainSvc)
	}

	if verbose {
		mainSvc.Add(newVerboseSvc())
	}

	errors := logger.NewRecorder(l, logger.LevelWarn, maxSystemErrors, 0)
	systemLog := logger.NewRecorder(l, logger.LevelDebug, maxSystemLog, initialSystemLog)

	// Event subscription for the API; must start early to catch the early events.
	apiSub := events.NewBufferedSubscription(events.Default.Subscribe(events.AllEvents), 1000)

	if len(os.Getenv("GOMAXPROCS")) == 0 {
		runtime.GOMAXPROCS(runtime.NumCPU())
	}

	// Attempt to increase the limit on number of open files to the maximum
	// allowed, in case we have many peers. We don't really care enough to
	// report the error if there is one.
	osutil.MaximizeOpenFileLimit()

	// Ensure that that we have a certificate and key.
	cert, err := tls.LoadX509KeyPair(locations[locCertFile], locations[locKeyFile])
	if err != nil {
		l.Infof("Generating RSA key and certificate for %s...", tlsDefaultCommonName)
		cert, err = tlsutil.NewCertificate(locations[locCertFile], locations[locKeyFile], tlsDefaultCommonName, tlsRSABits)
		if err != nil {
			l.Fatalln(err)
		}
	}

	// We reinitialize the predictable RNG with our device ID, to get a
	// sequence that is always the same but unique to this syncthing instance.
	predictableRandom.Seed(seedFromBytes(cert.Certificate[0]))

	myID = protocol.NewDeviceID(cert.Certificate[0])
	l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))

	l.Infoln(LongVersion)
	l.Infoln("My ID:", myID)

	// Emit the Starting event, now that we know who we are.

	events.Default.Log(events.Starting, map[string]string{
		"home": baseDirs["config"],
		"myID": myID.String(),
	})

	// Prepare to be able to save configuration

	cfgFile := locations[locConfigFile]

	// Load the configuration file, if it exists.
	// If it does not, create a template.

	cfg, myName, err := loadConfig(cfgFile)
	if err != nil {
		if os.IsNotExist(err) {
			l.Infoln("No config file; starting with empty defaults")
			myName, _ = os.Hostname()
			newCfg := defaultConfig(myName)
			cfg = config.Wrap(cfgFile, newCfg)
			cfg.Save()
			l.Infof("Edit %s to taste or use the GUI\n", cfgFile)
		} else {
			l.Fatalln("Loading config:", err)
		}
	}

	if cfg.Raw().OriginalVersion != config.CurrentVersion {
		l.Infoln("Archiving a copy of old config file format")
		// Archive a copy
		osutil.Rename(cfgFile, cfgFile+fmt.Sprintf(".v%d", cfg.Raw().OriginalVersion))
		// Save the new version
		cfg.Save()
	}

	if err := checkShortIDs(cfg); err != nil {
		l.Fatalln("Short device IDs are in conflict. Unlucky!\n  Regenerate the device ID of one if the following:\n  ", err)
	}

	if len(profiler) > 0 {
		go func() {
			l.Debugln("Starting profiler on", profiler)
//.........这里部分代码省略.........

func main() {
	flag.BoolVar(&showVersion, "version", false, "Show version")

	flag.Usage = usageFor(flag.CommandLine, usage, fmt.Sprintf(extraUsage, baseDirs["config"]))
	flag.Parse()

	if showVersion {
		fmt.Println(Version)
		return
	}

	if err := expandLocations(); err != nil {
		l.Fatalln(err)
	}

	// Ensure that our home directory exists.
	ensureDir(baseDirs["config"], 0700)

	// Ensure that that we have a certificate and key.
	tlsCfg, cert := getTlsConfig()

	// We reinitialize the predictable RNG with our device ID, to get a
	// sequence that is always the same but unique to this syncthing instance.
	predictableRandom.Seed(seedFromBytes(cert.Certificate[0]))

	myID = protocol.NewDeviceID(cert.Certificate[0])
	l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))

	l.Infoln("Started syncthingfuse v.", LongVersion)
	l.Infoln("My ID:", myID)

	cfg := getConfiguration()

	if info, err := os.Stat(cfg.Raw().MountPoint); err == nil {
		if !info.Mode().IsDir() {
			l.Fatalln("Mount point (", cfg.Raw().MountPoint, ") must be a directory, but isn't")
			os.Exit(1)
		}
	} else {
		l.Infoln("Mount point (", cfg.Raw().MountPoint, ") does not exist, creating it")
		err = os.MkdirAll(cfg.Raw().MountPoint, 0700)
		if err != nil {
			l.Fatalln("Error creating mount point", cfg.Raw().MountPoint, err)
			os.Exit(1)
		}
	}

	mainSvc := suture.New("main", suture.Spec{
		Log: func(line string) {
			l.Debugln(line)
		},
	})
	mainSvc.ServeBackground()

	database := openDatabase(cfg)

	m = model.NewModel(cfg, database)

	cachedDiscovery := startDiscovery()
	mainSvc.Add(cachedDiscovery)

	lans, _ := osutil.GetLans()

	connectionSvc := connections.NewConnectionSvc(cfg.AsStCfg(myID), myID, m, tlsCfg, cachedDiscovery, nil /* TODO relaySvc */, bepProtocolName, tlsDefaultCommonName, lans)
	mainSvc.Add(connectionSvc)

	l.Infoln("Started ...")

	MountFuse(cfg.Raw().MountPoint, m) // TODO handle fight between FUSE and Syncthing Service

	mainSvc.Stop()
	l.Okln("Exiting")

	return
}

func main() {
	flag.BoolVar(&showVersion, "version", false, "Show version")

	flag.Usage = usageFor(flag.CommandLine, usage, fmt.Sprintf(extraUsage, baseDirs["config"]))
	flag.Parse()

	if showVersion {
		fmt.Println(Version)
		return
	}

	if err := expandLocations(); err != nil {
		l.Fatalln(err)
	}

	// Ensure that our home directory exists.
	ensureDir(baseDirs["config"], 0700)

	// Ensure that that we have a certificate and key.
	tlsCfg, cert := getTlsConfig()

	// We reinitialize the predictable RNG with our device ID, to get a
	// sequence that is always the same but unique to this syncthing instance.
	predictableRandom.Seed(seedFromBytes(cert.Certificate[0]))

	myID = protocol.NewDeviceID(cert.Certificate[0])
	l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))

	l.Infoln("Started syncthingfuse v.", LongVersion)
	l.Infoln("My ID:", myID)

	cfg := getConfiguration()

	if info, err := os.Stat(cfg.Raw().MountPoint); err == nil {
		if !info.Mode().IsDir() {
			l.Fatalln("Mount point (", cfg.Raw().MountPoint, ") must be a directory, but isn't")
			os.Exit(1)
		}
	} else {
		l.Infoln("Mount point (", cfg.Raw().MountPoint, ") does not exist, creating it")
		err = os.MkdirAll(cfg.Raw().MountPoint, 0700)
		if err != nil {
			l.Warnln("Error creating mount point", cfg.Raw().MountPoint, err)
			l.Warnln("Sometimes, SyncthingFUSE doesn't shut down and unmount cleanly,")
			l.Warnln("If you don't know of any other file systems you have mounted at")
			l.Warnln("the mount point, try running the command below to unmount, then")
			l.Warnln("start SyncthingFUSE again.")
			l.Warnln("    umount", cfg.Raw().MountPoint)
			l.Fatalln("Cannot create missing mount point")
			os.Exit(1)
		}
	}

	mainSvc := suture.New("main", suture.Spec{
		Log: func(line string) {
			l.Debugln(line)
		},
	})
	mainSvc.ServeBackground()

	database := openDatabase(cfg)

	m = model.NewModel(cfg, database)

	lans, _ := osutil.GetLans()

	// Start discovery
	cachedDiscovery := discover.NewCachingMux()
	mainSvc.Add(cachedDiscovery)

	// Start connection management
	connectionsService := connections.NewService(cfg.AsStCfg(myID), myID, m, tlsCfg, cachedDiscovery, bepProtocolName, tlsDefaultCommonName, lans)
	mainSvc.Add(connectionsService)

	if cfg.Raw().Options.GlobalAnnounceEnabled {
		for _, srv := range cfg.Raw().Options.GlobalAnnounceServers {
			l.Infoln("Using discovery server", srv)
			gd, err := discover.NewGlobal(srv, cert, connectionsService)
			if err != nil {
				l.Warnln("Global discovery:", err)
				continue
			}

			// Each global discovery server gets its results cached for five
			// minutes, and is not asked again for a minute when it's returned
			// unsuccessfully.
			cachedDiscovery.Add(gd, 5*time.Minute, time.Minute, globalDiscoveryPriority)
		}
	}

	if cfg.Raw().Options.LocalAnnounceEnabled {
		// v4 broadcasts
		bcd, err := discover.NewLocal(myID, fmt.Sprintf(":%d", cfg.Raw().Options.LocalAnnouncePort), connectionsService)
		if err != nil {
			l.Warnln("IPv4 local discovery:", err)
		} else {
			cachedDiscovery.Add(bcd, 0, 0, ipv4LocalDiscoveryPriority)
		}
		// v6 multicasts
		mcd, err := discover.NewLocal(myID, cfg.Raw().Options.LocalAnnounceMCAddr, connectionsService)
//.........这里部分代码省略.........