Golang log.Errorf函数代码示例

// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *ConsulCatalog) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
	config := api.DefaultConfig()
	config.Address = provider.Endpoint
	client, err := api.NewClient(config)
	if err != nil {
		return err
	}
	provider.client = client
	provider.Constraints = append(provider.Constraints, constraints...)

	pool.Go(func(stop chan bool) {
		notify := func(err error, time time.Duration) {
			log.Errorf("Consul connection error %+v, retrying in %s", err, time)
		}
		operation := func() error {
			return provider.watch(configurationChan, stop)
		}
		err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
		if err != nil {
			log.Errorf("Cannot connect to consul server %+v", err)
		}
	})

	return err
}

func (provider *Marathon) loadMarathonConfig() *types.Configuration {
	var MarathonFuncMap = template.FuncMap{
		"getBackend":                  provider.getBackend,
		"getPort":                     provider.getPort,
		"getWeight":                   provider.getWeight,
		"getDomain":                   provider.getDomain,
		"getProtocol":                 provider.getProtocol,
		"getPassHostHeader":           provider.getPassHostHeader,
		"getPriority":                 provider.getPriority,
		"getEntryPoints":              provider.getEntryPoints,
		"getFrontendRule":             provider.getFrontendRule,
		"getFrontendBackend":          provider.getFrontendBackend,
		"hasCircuitBreakerLabels":     provider.hasCircuitBreakerLabels,
		"hasLoadBalancerLabels":       provider.hasLoadBalancerLabels,
		"hasMaxConnLabels":            provider.hasMaxConnLabels,
		"getMaxConnExtractorFunc":     provider.getMaxConnExtractorFunc,
		"getMaxConnAmount":            provider.getMaxConnAmount,
		"getLoadBalancerMethod":       provider.getLoadBalancerMethod,
		"getCircuitBreakerExpression": provider.getCircuitBreakerExpression,
		"getSticky":                   provider.getSticky,
	}

	applications, err := provider.marathonClient.Applications(nil)
	if err != nil {
		log.Errorf("Failed to create a client for marathon, error: %s", err)
		return nil
	}

	tasks, err := provider.marathonClient.AllTasks(&marathon.AllTasksOpts{Status: "running"})
	if err != nil {
		log.Errorf("Failed to create a client for marathon, error: %s", err)
		return nil
	}

	//filter tasks
	filteredTasks := fun.Filter(func(task marathon.Task) bool {
		return provider.taskFilter(task, applications, provider.ExposedByDefault)
	}, tasks.Tasks).([]marathon.Task)

	//filter apps
	filteredApps := fun.Filter(func(app marathon.Application) bool {
		return provider.applicationFilter(app, filteredTasks)
	}, applications.Apps).([]marathon.Application)

	templateObjects := struct {
		Applications []marathon.Application
		Tasks        []marathon.Task
		Domain       string
	}{
		filteredApps,
		filteredTasks,
		provider.Domain,
	}

	configuration, err := provider.getConfiguration("templates/marathon.tmpl", MarathonFuncMap, templateObjects)
	if err != nil {
		log.Error(err)
	}
	return configuration
}

func (server *Server) prepareServer(entryPointName string, router *middlewares.HandlerSwitcher, entryPoint *EntryPoint, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) (*manners.GracefulServer, error) {
	log.Infof("Preparing server %s %+v", entryPointName, entryPoint)
	// middlewares
	var negroni = negroni.New()
	for _, middleware := range middlewares {
		negroni.Use(middleware)
	}
	negroni.UseHandler(router)
	tlsConfig, err := server.createTLSConfig(entryPointName, entryPoint.TLS, router)
	if err != nil {
		log.Errorf("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.Errorf("Error hijacking server %s", err)
		return nil, err
	}
	return gracefulServer, nil
}

func (a *ACME) retrieveCertificates() {
	log.Infof("Retrieving ACME certificates...")
	for _, domain := range a.Domains {
		// check if cert isn't already loaded
		account := a.store.Get().(*Account)
		if _, exists := account.DomainsCertificate.exists(domain); !exists {
			domains := []string{}
			domains = append(domains, domain.Main)
			domains = append(domains, domain.SANs...)
			certificateResource, err := a.getDomainsCertificates(domains)
			if err != nil {
				log.Errorf("Error getting ACME certificate for domain %s: %s", domains, err.Error())
				continue
			}
			transaction, object, err := a.store.Begin()
			if err != nil {
				log.Errorf("Error creating ACME store transaction from domain %s: %s", domain, err.Error())
				continue
			}
			account = object.(*Account)
			_, err = account.DomainsCertificate.addCertificateForDomains(certificateResource, domain)
			if err != nil {
				log.Errorf("Error adding ACME certificate for domain %s: %s", domains, err.Error())
				continue
			}

			if err = transaction.Commit(account); err != nil {
				log.Errorf("Error Saving ACME account %+v: %s", account, err.Error())
				continue
			}
		}
	}
	log.Infof("Retrieved ACME certificates")
}

func (provider *Kv) provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
	provider.Constraints = append(provider.Constraints, constraints...)
	operation := func() error {
		if _, err := provider.kvclient.Exists("qmslkjdfmqlskdjfmqlksjazçueznbvbwzlkajzebvkwjdcqmlsfj"); err != nil {
			return fmt.Errorf("Failed to test KV store connection: %v", err)
		}
		if provider.Watch {
			pool.Go(func(stop chan bool) {
				err := provider.watchKv(configurationChan, provider.Prefix, stop)
				if err != nil {
					log.Errorf("Cannot watch KV store: %v", err)
				}
			})
		}
		configuration := provider.loadConfig()
		configurationChan <- types.ConfigMessage{
			ProviderName:  string(provider.storeType),
			Configuration: configuration,
		}
		return nil
	}
	notify := func(err error, time time.Duration) {
		log.Errorf("KV connection error: %+v, retrying in %s", err, time)
	}
	err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
	if err != nil {
		return fmt.Errorf("Cannot connect to KV server: %v", err)
	}
	return nil
}

// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *Kubernetes) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
	k8sClient, err := provider.newK8sClient()
	if err != nil {
		return err
	}
	provider.Constraints = append(provider.Constraints, constraints...)

	pool.Go(func(stop chan bool) {
		operation := func() error {
			for {
				stopWatch := make(chan struct{}, 1)
				defer close(stopWatch)
				log.Debugf("Using label selector: '%s'", provider.LabelSelector)
				eventsChan, err := k8sClient.WatchAll(provider.LabelSelector, stopWatch)
				if err != nil {
					log.Errorf("Error watching kubernetes events: %v", err)
					timer := time.NewTimer(1 * time.Second)
					select {
					case <-timer.C:
						return err
					case <-stop:
						return nil
					}
				}
				for {
					select {
					case <-stop:
						return nil
					case event := <-eventsChan:
						log.Debugf("Received event from kubernetes %+v", event)
						templateObjects, err := provider.loadIngresses(k8sClient)
						if err != nil {
							return err
						}
						if reflect.DeepEqual(provider.lastConfiguration.Get(), templateObjects) {
							log.Debugf("Skipping event from kubernetes %+v", event)
						} else {
							provider.lastConfiguration.Set(templateObjects)
							configurationChan <- types.ConfigMessage{
								ProviderName:  "kubernetes",
								Configuration: provider.loadConfig(*templateObjects),
							}
						}
					}
				}
			}
		}

		notify := func(err error, time time.Duration) {
			log.Errorf("Kubernetes connection error %+v, retrying in %s", err, time)
		}
		err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
		if err != nil {
			log.Errorf("Cannot connect to Kubernetes server %+v", err)
		}
	})

	return nil
}

// Begin creates a transaction with the KV store.
func (d *Datastore) Begin() (Transaction, Object, error) {
	id := uuid.NewV4().String()
	log.Debugf("Transaction %s begins", id)
	remoteLock, err := d.kv.NewLock(d.lockKey, &store.LockOptions{TTL: 20 * time.Second, Value: []byte(id)})
	if err != nil {
		return nil, nil, err
	}
	stopCh := make(chan struct{})
	ctx, cancel := context.WithCancel(d.ctx)
	var errLock error
	go func() {
		_, errLock = remoteLock.Lock(stopCh)
		cancel()
	}()
	select {
	case <-ctx.Done():
		if errLock != nil {
			return nil, nil, errLock
		}
	case <-d.ctx.Done():
		stopCh <- struct{}{}
		return nil, nil, d.ctx.Err()
	}

	// we got the lock! Now make sure we are synced with KV store
	operation := func() error {
		meta := d.get()
		if meta.Lock != id {
			return fmt.Errorf("Object lock value: expected %s, got %s", id, meta.Lock)
		}
		return nil
	}
	notify := func(err error, time time.Duration) {
		log.Errorf("Datastore sync error: %v, retrying in %s", err, time)
		err = d.reload()
		if err != nil {
			log.Errorf("Error reloading: %+v", err)
		}
	}
	ebo := backoff.NewExponentialBackOff()
	ebo.MaxElapsedTime = 60 * time.Second
	err = backoff.RetryNotify(operation, ebo, notify)
	if err != nil {
		return nil, nil, fmt.Errorf("Datastore cannot sync: %v", err)
	}

	// we synced with KV store, we can now return Setter
	return &datastoreTransaction{
		Datastore:  d,
		remoteLock: remoteLock,
		id:         id,
	}, d.meta.object, nil
}

func detectMasters(zk string, masters []string) <-chan []string {
	changed := make(chan []string, 1)
	if zk != "" {
		log.Debugf("Starting master detector for ZK ", zk)
		if md, err := detector.New(zk); err != nil {
			log.Errorf("failed to create master detector: %v", err)
		} else if err := md.Detect(detect.NewMasters(masters, changed)); err != nil {
			log.Errorf("failed to initialize master detector: %v", err)
		}
	} else {
		changed <- masters
	}
	return changed
}

func setLabels(kvs ...string) taskOpt {
	return func(t *state.Task) {
		if len(kvs)%2 != 0 {
			panic("odd number")
		}

		for i := 0; i < len(kvs); i += 2 {
			var label = state.Label{Key: kvs[i], Value: kvs[i+1]}
			log.Errorf("Label1.1 : %v", label)
			t.Labels = append(t.Labels, label)
			log.Errorf("Label1.2 : %v", t.Labels)
		}

	}
}

func (server *Server) postLoadConfig() {
	if server.globalConfiguration.ACME == nil {
		return
	}
	if server.leadership != nil && !server.leadership.IsLeader() {
		return
	}
	if server.globalConfiguration.ACME.OnHostRule {
		currentConfigurations := server.currentConfigurations.Get().(configs)
		for _, configuration := range currentConfigurations {
			for _, frontend := range configuration.Frontends {
				for _, route := range frontend.Routes {
					rules := Rules{}
					domains, err := rules.ParseDomains(route.Rule)
					if err != nil {
						log.Errorf("Error parsing domains: %v", err)
					} else {
						server.globalConfiguration.ACME.LoadCertificateForDomains(domains)
					}
				}

			}
		}
	}
}

func (provider *Kv) watchKv(configurationChan chan<- types.ConfigMessage, prefix string, stop chan bool) error {
	operation := func() error {
		events, err := provider.kvclient.WatchTree(provider.Prefix, make(chan struct{}))
		if err != nil {
			return fmt.Errorf("Failed to KV WatchTree: %v", err)
		}
		for {
			select {
			case <-stop:
				return nil
			case _, ok := <-events:
				if !ok {
					return errors.New("watchtree channel closed")
				}
				configuration := provider.loadConfig()
				if configuration != nil {
					configurationChan <- types.ConfigMessage{
						ProviderName:  string(provider.storeType),
						Configuration: configuration,
					}
				}
			}
		}
	}

	notify := func(err error, time time.Duration) {
		log.Errorf("KV connection error: %+v, retrying in %s", err, time)
	}
	err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
	if err != nil {
		return fmt.Errorf("Cannot connect to KV server: %v", err)
	}
	return nil
}

// GetPrivateKey returns private key
func (a *Account) GetPrivateKey() crypto.PrivateKey {
	if privateKey, err := x509.ParsePKCS1PrivateKey(a.PrivateKey); err == nil {
		return privateKey
	}
	log.Errorf("Cannot unmarshall private key %+v", a.PrivateKey)
	return nil
}

func (provider *Marathon) getBackend(task marathon.Task, applications []marathon.Application) string {
	application, errApp := getApplication(task, applications)
	if errApp != nil {
		log.Errorf("Unable to get marathon application from task %s", task.AppID)
		return ""
	}
	return provider.getFrontendBackend(application)
}

func (provider *Mesos) getBackend(task state.Task, applications []state.Task) string {
	application, errApp := getMesos(task, applications)
	if errApp != nil {
		log.Errorf("Unable to get mesos application from task %s", task.DiscoveryInfo.Name)
		return ""
	}
	return provider.getFrontendBackend(application)
}

// Participate tries to be a leader
func (l *Leadership) Participate(pool *safe.Pool) {
	pool.GoCtx(func(ctx context.Context) {
		log.Debugf("Node %s running for election", l.Cluster.Node)
		defer log.Debugf("Node %s no more running for election", l.Cluster.Node)
		backOff := backoff.NewExponentialBackOff()
		operation := func() error {
			return l.run(ctx, l.candidate)
		}

		notify := func(err error, time time.Duration) {
			log.Errorf("Leadership election error %+v, retrying in %s", err, time)
		}
		err := backoff.RetryNotify(operation, backOff, notify)
		if err != nil {
			log.Errorf("Cannot elect leadership %+v", err)
		}
	})
}