Golang manners.GracefulServer類代碼示例

func prepareServer(router *mux.Router, globalConfiguration *GlobalConfiguration, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) *manners.GracefulServer {
	log.Info("Preparing server")
	// middlewares
	var negroni = negroni.New()
	for _, middleware := range middlewares {
		negroni.Use(middleware)
	}
	negroni.UseHandler(router)

	if oldServer == nil {
		return manners.NewWithServer(
			&http.Server{
				Addr:    globalConfiguration.Port,
				Handler: negroni,
			})
	} else {
		server, err := oldServer.HijackListener(&http.Server{
			Addr:    globalConfiguration.Port,
			Handler: negroni,
		}, nil)
		if err != nil {
			log.Fatalf("Error hijacking server %s", err)
			return nil
		} else {
			return server
		}
	}
}

func prepareServer(router *mux.Router, globalConfiguration *GlobalConfiguration, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) (*manners.GracefulServer, error) {
	log.Info("Preparing server")
	// middlewares
	var negroni = negroni.New()
	for _, middleware := range middlewares {
		negroni.Use(middleware)
	}
	negroni.UseHandler(router)
	tlsConfig, err := createTLSConfig(globalConfiguration.Certificates)
	if err != nil {
		log.Fatalf("Error creating TLS config %s", err)
		return nil, err
	}

	if oldServer == nil {
		return manners.NewWithServer(
			&http.Server{
				Addr:      globalConfiguration.Port,
				Handler:   negroni,
				TLSConfig: tlsConfig,
			}), nil
	}
	server, err := oldServer.HijackListener(&http.Server{
		Addr:      globalConfiguration.Port,
		Handler:   negroni,
		TLSConfig: tlsConfig,
	}, tlsConfig)
	if err != nil {
		log.Fatalf("Error hijacking server %s", err)
		return nil, err
	}
	return server, nil
}

func (server *Server) prepareServer(router *mux.Router, entryPoint *EntryPoint, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) (*manners.GracefulServer, error) {
	log.Info("Preparing server")
	// middlewares
	var negroni = negroni.New()
	for _, middleware := range middlewares {
		negroni.Use(middleware)
	}
	negroni.UseHandler(router)
	tlsConfig, err := server.createTLSConfig(entryPoint.TLS)
	if err != nil {
		log.Fatalf("Error creating TLS config %s", err)
		return nil, err
	}

	if oldServer == nil {
		return manners.NewWithServer(
			&http.Server{
				Addr:      entryPoint.Address,
				Handler:   negroni,
				TLSConfig: tlsConfig,
			}), nil
	}
	gracefulServer, err := oldServer.HijackListener(&http.Server{
		Addr:      entryPoint.Address,
		Handler:   negroni,
		TLSConfig: tlsConfig,
	}, tlsConfig)
	if err != nil {
		log.Fatalf("Error hijacking server %s", err)
		return nil, err
	}
	return gracefulServer, nil
}

func (s *srv) serve(srv *manners.GracefulServer) {
	log.Infof("%s serve", s)

	s.mux.wg.Add(1)
	defer s.mux.wg.Done()

	srv.ListenAndServe()

	log.Infof("%v stop", s)
}

func (server *Server) startServer(srv *manners.GracefulServer, globalConfiguration GlobalConfiguration) {
	log.Infof("Starting server on %s", srv.Addr)
	if srv.TLSConfig != nil {
		if err := srv.ListenAndServeTLSWithConfig(srv.TLSConfig); err != nil {
			log.Fatal("Error creating server: ", err)
		}
	} else {
		if err := srv.ListenAndServe(); err != nil {
			log.Fatal("Error creating server: ", err)
		}
	}
	log.Info("Server stopped")
}

func startServer(srv *manners.GracefulServer, globalConfiguration *GlobalConfiguration) {
	log.Info("Starting server")
	if srv.TLSConfig != nil {
		err := srv.ListenAndServeTLSWithConfig(srv.TLSConfig)
		if err != nil {
			log.Fatal("Error creating server: ", err)
		}
	} else {
		err := srv.ListenAndServe()
		if err != nil {
			log.Fatal("Error creating server: ", err)
		}
	}
	log.Info("Server stopped")
}

func startServer(srv *manners.GracefulServer, globalConfiguration *GlobalConfiguration) {
	log.Info("Starting server")
	if len(globalConfiguration.CertFile) > 0 && len(globalConfiguration.KeyFile) > 0 {
		err := srv.ListenAndServeTLS(globalConfiguration.CertFile, globalConfiguration.KeyFile)
		if err != nil {
			log.Fatal("Error creating server: ", err)
		}
	} else {
		err := srv.ListenAndServe()
		if err != nil {
			log.Fatal("Error creating server: ", err)
		}
	}
	log.Info("Server stopped")
}

func startServer(srv *manners.GracefulServer, globalConfiguration *GlobalConfiguration) {
	log.Info("Starting server")
	if len(globalConfiguration.CertFile) > 0 && len(globalConfiguration.KeyFile) > 0 {
		err := srv.ListenAndServeTLS(globalConfiguration.CertFile, globalConfiguration.KeyFile)
		if err != nil {
			netOpError, ok := err.(*net.OpError)
			if ok && netOpError.Err.Error() != "use of closed network connection" {
				log.Fatal("Error creating server: ", err)
			}
		}
	} else {
		err := srv.ListenAndServe()
		if err != nil {
			netOpError, ok := err.(*net.OpError)
			if ok && netOpError.Err.Error() != "use of closed network connection" {
				log.Fatal("Error creating server: ", err)
			}
		}
	}
	log.Info("Server stopped")
}

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())
	kingpin.Version(Version + " built on the " + BuildDate)
	kingpin.Parse()
	fmtlog.SetFlags(fmtlog.Lshortfile | fmtlog.LstdFlags)
	var srv *manners.GracefulServer
	var configurationRouter *mux.Router
	var configurationChan = make(chan types.ConfigMessage, 10)
	defer close(configurationChan)
	var configurationChanValidated = make(chan types.ConfigMessage, 10)
	defer close(configurationChanValidated)
	var sigs = make(chan os.Signal, 1)
	defer close(sigs)
	var stopChan = make(chan bool)
	defer close(stopChan)
	var providers = []provider.Provider{}
	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
	var serverLock sync.Mutex

	// load global configuration
	globalConfiguration := LoadFileConfig(*globalConfigFile)

	loggerMiddleware := middlewares.NewLogger(globalConfiguration.AccessLogsFile)
	defer loggerMiddleware.Close()

	// logging
	level, err := log.ParseLevel(strings.ToLower(globalConfiguration.LogLevel))
	if err != nil {
		log.Fatal("Error getting level", err)
	}
	log.SetLevel(level)

	if len(globalConfiguration.TraefikLogsFile) > 0 {
		fi, err := os.OpenFile(globalConfiguration.TraefikLogsFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
		defer fi.Close()
		if err != nil {
			log.Fatal("Error opening file", err)
		} else {
			log.SetOutput(fi)
			log.SetFormatter(&log.TextFormatter{DisableColors: true, FullTimestamp: true, DisableSorting: true})
		}
	} else {
		log.SetFormatter(&log.TextFormatter{FullTimestamp: true, DisableSorting: true})
	}
	log.Debugf("Global configuration loaded %+v", globalConfiguration)
	configurationRouter = LoadDefaultConfig(globalConfiguration)

	// listen new configurations from providers
	go func() {
		lastReceivedConfiguration := time.Unix(0, 0)
		lastConfigs := make(map[string]*types.ConfigMessage)
		for {
			configMsg := <-configurationChan
			log.Infof("Configuration receveived from provider %s: %#v", configMsg.ProviderName, configMsg.Configuration)
			lastConfigs[configMsg.ProviderName] = &configMsg
			if time.Now().After(lastReceivedConfiguration.Add(time.Duration(globalConfiguration.ProvidersThrottleDuration))) {
				log.Infof("Last %s config received more than %s, OK", configMsg.ProviderName, globalConfiguration.ProvidersThrottleDuration)
				// last config received more than n s ago
				configurationChanValidated <- configMsg
			} else {
				log.Infof("Last %s config received less than %s, waiting...", configMsg.ProviderName, globalConfiguration.ProvidersThrottleDuration)
				go func() {
					<-time.After(globalConfiguration.ProvidersThrottleDuration)
					if time.Now().After(lastReceivedConfiguration.Add(time.Duration(globalConfiguration.ProvidersThrottleDuration))) {
						log.Infof("Waited for %s config, OK", configMsg.ProviderName)
						configurationChanValidated <- *lastConfigs[configMsg.ProviderName]
					}
				}()
			}
			lastReceivedConfiguration = time.Now()
		}
	}()
	go func() {
		for {
			configMsg := <-configurationChanValidated
			if configMsg.Configuration == nil {
				log.Info("Skipping empty Configuration")
			} else if reflect.DeepEqual(currentConfigurations[configMsg.ProviderName], configMsg.Configuration) {
				log.Info("Skipping same configuration")
			} else {
				// Copy configurations to new map so we don't change current if LoadConfig fails
				newConfigurations := make(configs)
				for k, v := range currentConfigurations {
					newConfigurations[k] = v
				}
				newConfigurations[configMsg.ProviderName] = configMsg.Configuration

				newConfigurationRouter, err := LoadConfig(newConfigurations, globalConfiguration)
				if err == nil {
					serverLock.Lock()
					currentConfigurations = newConfigurations
					configurationRouter = newConfigurationRouter
					oldServer := srv
					newsrv, err := prepareServer(configurationRouter, globalConfiguration, oldServer, loggerMiddleware, metrics)
					if err != nil {
						log.Fatal("Error preparing server: ", err)
					}
					go startServer(newsrv, globalConfiguration)
					srv = newsrv
					time.Sleep(1 * time.Second)
//.........這裏部分代碼省略.........

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())
	kingpin.Parse()
	fmtlog.SetFlags(fmtlog.Lshortfile | fmtlog.LstdFlags)
	var srv *manners.GracefulServer
	var configurationRouter *mux.Router
	var configurationChan = make(chan configMessage, 10)
	defer close(configurationChan)
	var sigs = make(chan os.Signal, 1)
	defer close(sigs)
	var stopChan = make(chan bool)
	defer close(stopChan)
	var providers = []Provider{}
	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)

	// load global configuration
	globalConfiguration := LoadFileConfig(*globalConfigFile)

	loggerMiddleware := middlewares.NewLogger(globalConfiguration.AccessLogsFile)
	defer loggerMiddleware.Close()

	// logging
	level, err := log.ParseLevel(strings.ToLower(globalConfiguration.LogLevel))
	if err != nil {
		log.Fatal("Error getting level", err)
	}
	log.SetLevel(level)

	if len(globalConfiguration.TraefikLogsFile) > 0 {
		fi, err := os.OpenFile(globalConfiguration.TraefikLogsFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
		defer fi.Close()
		if err != nil {
			log.Fatal("Error opening file", err)
		} else {
			log.SetOutput(fi)
			log.SetFormatter(&log.TextFormatter{DisableColors: true, FullTimestamp: true, DisableSorting: true})
		}
	} else {
		log.SetFormatter(&log.TextFormatter{FullTimestamp: true, DisableSorting: true})
	}

	configurationRouter = LoadDefaultConfig(globalConfiguration)

	// listen new configurations from providers
	go func() {

		for {
			configMsg := <-configurationChan
			log.Infof("Configuration receveived from provider %v: %+v", configMsg.providerName, configMsg.configuration)
			if configMsg.configuration == nil {
				log.Info("Skipping empty configuration")
			} else if reflect.DeepEqual(currentConfigurations[configMsg.providerName], configMsg.configuration) {
				log.Info("Skipping same configuration")
			} else {
				// Copy configurations to new map so we don't change current if LoadConfig fails
				newConfigurations := make(configs)
				for k, v := range currentConfigurations {
					newConfigurations[k] = v
				}
				newConfigurations[configMsg.providerName] = configMsg.configuration

				newConfigurationRouter, err := LoadConfig(newConfigurations, globalConfiguration)
				if err == nil {
					currentConfigurations = newConfigurations
					configurationRouter = newConfigurationRouter
					oldServer := srv
					newsrv := prepareServer(configurationRouter, globalConfiguration, oldServer, loggerMiddleware, metrics)
					go startServer(newsrv, globalConfiguration)
					srv = newsrv
					time.Sleep(2 * time.Second)
					if oldServer != nil {
						log.Info("Stopping old server")
						oldServer.Close()
					}
				} else {
					log.Error("Error loading new configuration, aborted ", err)
				}
			}
		}
	}()

	// configure providers
	if globalConfiguration.Docker != nil {
		providers = append(providers, globalConfiguration.Docker)
	}
	if globalConfiguration.Marathon != nil {
		providers = append(providers, globalConfiguration.Marathon)
	}
	if globalConfiguration.File != nil {
		if len(globalConfiguration.File.Filename) == 0 {
			// no filename, setting to global config file
			globalConfiguration.File.Filename = *globalConfigFile
		}
		providers = append(providers, globalConfiguration.File)
	}
	if globalConfiguration.Web != nil {
		providers = append(providers, globalConfiguration.Web)
	}
	if globalConfiguration.Consul != nil {
		providers = append(providers, globalConfiguration.Consul)
//.........這裏部分代碼省略.........