Golang Logger.Info方法代碼示例

func Connect(adapter Adapter, backoffStrategy retrystrategy.RetryStrategy, logger *gosteno.Logger, maxRetries int) error {
	timer := time.NewTimer(backoffStrategy(0))
	defer timer.Stop()

	numberOfTries := 0
	for {
		err := adapter.Connect()
		if err == nil {
			logger.Info("Connected to etcd")
			return nil
		}

		numberOfTries++
		sleepDuration := backoffStrategy(numberOfTries)
		logger.Warnd(map[string]interface{}{
			"error": err.Error(),
		}, fmt.Sprintf("Failed to connect to etcd. Number of tries: %d. Backing off for %v.", numberOfTries, sleepDuration))

		timer.Reset(sleepDuration)
		<-timer.C

		if numberOfTries >= maxRetries {
			return fmt.Errorf("Failed to connect to etcd after %d tries.", numberOfTries)
		}
	}
}

func newTokenFetcher(c *config.Config, logger *steno.Logger) token_fetcher.TokenFetcher {
	if c.RoutingApi.AuthDisabled {
		logger.Info("using noop token fetcher")
		return token_fetcher.NewNoOpTokenFetcher()
	}
	tokenFetcher := token_fetcher.NewTokenFetcher(&c.OAuth)
	logger.Info("using uaa token fetcher")
	return tokenFetcher
}

func waitOnErrOrSignal(c *config.Config, logger *steno.Logger, errChan <-chan error, router *router.Router) {
	signals := make(chan os.Signal, 1)
	signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT, syscall.SIGUSR1)

	select {
	case err := <-errChan:
		if err != nil {
			logger.Errorf("Error occurred: %s", err.Error())
			os.Exit(1)
		}
	case sig := <-signals:
		go func() {
			for sig := range signals {
				logger.Infod(
					map[string]interface{}{
						"signal": sig.String(),
					},
					"gorouter.signal.ignored",
				)
			}
		}()

		if sig == syscall.SIGUSR1 {
			logger.Infod(
				map[string]interface{}{
					"timeout": (c.DrainTimeout).String(),
				},
				"gorouter.draining",
			)

			router.Drain(c.DrainTimeout)
		}

		stoppingAt := time.Now()

		logger.Info("gorouter.stopping")

		router.Stop()

		logger.Infod(
			map[string]interface{}{
				"took": time.Since(stoppingAt).String(),
			},
			"gorouter.stopped",
		)
	}
}

func newTokenFetcher(logger *steno.Logger, clock clock.Clock, c *config.Config) token_fetcher.TokenFetcher {
	if c.RoutingApi.AuthDisabled {
		logger.Info("using noop token fetcher")
		return token_fetcher.NewNoOpTokenFetcher()
	}
	tokenFetcherConfig := token_fetcher.TokenFetcherConfig{
		MaxNumberOfRetries:   c.TokenFetcherMaxRetries,
		RetryInterval:        c.TokenFetcherRetryInterval,
		ExpirationBufferTime: c.TokenFetcherExpirationBufferTimeInSeconds,
	}
	cfLogger, _ := cf_lager.New("token_fetcher")
	tokenFetcher, err := token_fetcher.NewTokenFetcher(cfLogger, &c.OAuth, tokenFetcherConfig, clock)
	if err != nil {
		logger.Errorf("Error creating token fetcher: %s\n", err)
		os.Exit(1)
	}
	logger.Info("using uaa token fetcher")
	return tokenFetcher
}

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")
}