Golang Logger.Fatalf方法代碼示例

func NewLoggregatorClient(loggregatorAddress string, logger *gosteno.Logger, bufferSize int) LoggregatorClient {
	loggregatorClient := &udpLoggregatorClient{}

	la, err := net.ResolveUDPAddr("udp", loggregatorAddress)
	if err != nil {
		logger.Fatalf("Error resolving loggregator address %s, %s", loggregatorAddress, err)
	}

	connection, err := net.ListenPacket("udp", "")
	if err != nil {
		logger.Fatalf("Error opening udp stuff")
	}

	loggregatorClient.loggregatorAddress = la.IP.String()
	loggregatorClient.sendChannel = make(chan []byte, bufferSize)

	go func() {
		for dataToSend := range loggregatorClient.sendChannel {
			if len(dataToSend) > 0 {
				writeCount, err := connection.WriteTo(dataToSend, la)
				if err != nil {
					logger.Errorf("Writing to loggregator %s failed %s", loggregatorAddress, err)
					continue
				}
				logger.Debugf("Wrote %d bytes to %s", writeCount, loggregatorAddress)
				atomic.AddUint64(&loggregatorClient.sentMessageCount, 1)
				atomic.AddUint64(&loggregatorClient.sentByteCount, uint64(writeCount))
			} else {
				logger.Debugf("Skipped writing of 0 byte message to %s", loggregatorAddress)
			}
		}
	}()

	return loggregatorClient
}

func NewLoggregatorClient(loggregatorAddress string, logger *gosteno.Logger, bufferSize int) *udpLoggregatorClient {
	loggregatorClient := &udpLoggregatorClient{make(chan []byte, bufferSize)}

	connection, err := net.Dial("udp", loggregatorAddress)
	if err != nil {
		logger.Fatalf("Error resolving loggregator address %s, %s", loggregatorAddress, err)
		panic(err)
	}

	go func() {
		for {
			dataToSend := <-loggregatorClient.sendChannel
			if len(dataToSend) > 0 {
				writeCount, err := connection.Write(dataToSend)
				logger.Debugf("Wrote %d bytes to %s", writeCount, loggregatorAddress)
				if err != nil {
					logger.Errorf("Writing to loggregator %s failed %s", loggregatorAddress, err)
				}
			} else {
				logger.Debugf("Skipped writing of 0 byte message to %s", loggregatorAddress)
			}
		}
	}()

	return loggregatorClient
}

func generateCert(logger *gosteno.Logger) {
	// see: http://golang.org/src/pkg/crypto/tls/generate_cert.go
	host := "localhost"
	validFrom := "Jan 1 15:04:05 2011"
	validFor := 10 * 365 * 24 * time.Hour
	isCA := true
	rsaBits := 1024

	if len(host) == 0 {
		logger.Fatalf("Missing required --host parameter")
	}

	priv, err := rsa.GenerateKey(rand.Reader, rsaBits)
	if err != nil {
		logger.Fatalf("failed to generate private key: %s", err)
		panic(err)
	}

	var notBefore time.Time
	if len(validFrom) == 0 {
		notBefore = time.Now()
	} else {
		notBefore, err = time.Parse("Jan 2 15:04:05 2006", validFrom)
		if err != nil {
			logger.Fatalf("Failed to parse creation date: %s\n", err)
			panic(err)
		}
	}

	notAfter := notBefore.Add(validFor)

	// end of ASN.1 time
	endOfTime := time.Date(2049, 12, 31, 23, 59, 59, 0, time.UTC)
	if notAfter.After(endOfTime) {
		notAfter = endOfTime
	}

	template := x509.Certificate{
		SerialNumber: new(big.Int).SetInt64(0),
		Subject: pkix.Name{
			Organization: []string{"Loggregator TrafficController TEST"},
		},
		NotBefore:             notBefore,
		NotAfter:              notAfter,
		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
		BasicConstraintsValid: true,
	}

	hosts := strings.Split(host, ",")
	for _, h := range hosts {
		if ip := net.ParseIP(h); ip != nil {
			template.IPAddresses = append(template.IPAddresses, ip)
		} else {
			template.DNSNames = append(template.DNSNames, h)
		}
	}

	if isCA {
		template.IsCA = true
		template.KeyUsage |= x509.KeyUsageCertSign
	}

	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
	if err != nil {
		logger.Fatalf("Failed to create certificate: %s", err)
		panic(err)
	}

	certOut, err := os.Create("cert.pem")
	if err != nil {
		logger.Fatalf("failed to open cert.pem for writing: %s", err)
		panic(err)
	}
	pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
	certOut.Close()
	logger.Info("written cert.pem\n")

	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	if err != nil {
		logger.Fatalf("failed to open key.pem for writing: %s", err)
		panic(err)
	}
	pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
	keyOut.Close()
	logger.Info("written key.pem\n")
}

func New(logger *gosteno.Logger,
	host string,
	config *config.Config,
	storeAdapter storeadapter.StoreAdapter,
	messageDrainBufferSize uint,
	dropsondeOrigin string,
	dialTimeout time.Duration) *Doppler {

	keepAliveInterval := 30 * time.Second

	appStoreCache := cache.NewAppServiceCache()
	appStoreWatcher, newAppServiceChan, deletedAppServiceChan := store.NewAppServiceStoreWatcher(storeAdapter, appStoreCache, logger)

	var udpListener listeners.Listener
	var tlsListener listeners.Listener
	var dropsondeBytesChan <-chan []byte
	listenerEnvelopeChan := make(chan *events.Envelope)
	if config.EnableTLSTransport {
		tlsConfig := &tls.Config{
			Certificates: []tls.Certificate{config.TLSListenerConfig.Cert},
		}
		var err error
		tlsListener, err = listeners.NewTLSListener("dropsondeListener", fmt.Sprintf("%s:%d", host, config.TLSListenerConfig.Port), tlsConfig, listenerEnvelopeChan, logger)
		if err != nil {
			logger.Fatalf("Failed to create a TLS Listener: %s", err)
		}
	}

	udpListener, dropsondeBytesChan = listeners.NewUDPListener(fmt.Sprintf("%s:%d", host, config.DropsondeIncomingMessagesPort), logger, "dropsondeListener")

	signatureVerifier := signature.NewVerifier(logger, config.SharedSecret)

	unmarshallerCollection := dropsonde_unmarshaller.NewDropsondeUnmarshallerCollection(logger, config.UnmarshallerCount)

	blacklist := blacklist.New(config.BlackListIps)
	metricTTL := time.Duration(config.ContainerMetricTTLSeconds) * time.Second
	sinkTimeout := time.Duration(config.SinkInactivityTimeoutSeconds) * time.Second
	sinkIOTimeout := time.Duration(config.SinkIOTimeoutSeconds) * time.Second
	sinkManager := sinkmanager.New(config.MaxRetainedLogMessages, config.SkipCertVerify, blacklist, logger, messageDrainBufferSize, dropsondeOrigin, sinkTimeout, sinkIOTimeout, metricTTL, dialTimeout)

	websocketServer, err := websocketserver.New(fmt.Sprintf("%s:%d", host, config.OutgoingPort), sinkManager, keepAliveInterval, config.MessageDrainBufferSize, dropsondeOrigin, logger)
	if err != nil {
		logger.Fatalf("Failed to create the websocket server: %s", err)
	}

	return &Doppler{
		Logger:                          logger,
		udpListener:                     udpListener,
		tlsListener:                     tlsListener,
		sinkManager:                     sinkManager,
		messageRouter:                   sinkserver.NewMessageRouter(sinkManager, logger),
		websocketServer:                 websocketServer,
		newAppServiceChan:               newAppServiceChan,
		deletedAppServiceChan:           deletedAppServiceChan,
		appStoreWatcher:                 appStoreWatcher,
		storeAdapter:                    storeAdapter,
		dropsondeBytesChan:              dropsondeBytesChan,
		dropsondeUnmarshallerCollection: unmarshallerCollection,
		envelopeChan:                    listenerEnvelopeChan,
		signatureVerifier:               signatureVerifier,
		dropsondeVerifiedBytesChan:      make(chan []byte),
		uptimeMonitor:                   monitor.NewUptimeMonitor(time.Duration(config.MonitorIntervalSeconds) * time.Second),
	}
}