package provider import ( "errors" "fmt" "strconv" "strings" "text/template" "time" "github.com/BurntSushi/ty/fun" log "github.com/Sirupsen/logrus" "github.com/cenkalti/backoff" "github.com/emilevauge/traefik/types" "github.com/fsouza/go-dockerclient" ) // Docker holds configurations of the Docker provider. type Docker struct { baseProvider Endpoint string Domain string TLS *DockerTLS } // DockerTLS holds TLS specific configurations type DockerTLS struct { CA string Cert string Key string InsecureSkipVerify bool } // Provide allows the provider to provide configurations to traefik // using the given configuration channel. func (provider *Docker) Provide(configurationChan chan<- types.ConfigMessage) error { var dockerClient *docker.Client var err error if provider.TLS != nil { dockerClient, err = docker.NewTLSClient(provider.Endpoint, provider.TLS.Cert, provider.TLS.Key, provider.TLS.CA) if err == nil { dockerClient.TLSConfig.InsecureSkipVerify = provider.TLS.InsecureSkipVerify } } else { dockerClient, err = docker.NewClient(provider.Endpoint) } if err != nil { log.Errorf("Failed to create a client for docker, error: %s", err) return err } err = dockerClient.Ping() if err != nil { log.Errorf("Docker connection error %+v", err) return err } log.Debug("Docker connection established") if provider.Watch { dockerEvents := make(chan *docker.APIEvents) dockerClient.AddEventListener(dockerEvents) log.Debug("Docker listening") go func() { operation := func() error { for { event := <-dockerEvents if event == nil { return errors.New("Docker event nil") // log.Fatalf("Docker connection error") } if event.Status == "start" || event.Status == "die" { log.Debugf("Docker event receveived %+v", event) configuration := provider.loadDockerConfig(listContainers(dockerClient)) if configuration != nil { configurationChan <- types.ConfigMessage{ ProviderName: "docker", Configuration: configuration, } } } } } notify := func(err error, time time.Duration) { log.Errorf("Docker connection error %+v, retrying in %s", err, time) } err := backoff.RetryNotify(operation, backoff.NewExponentialBackOff(), notify) if err != nil { log.Fatalf("Cannot connect to docker server %+v", err) } }() } configuration := provider.loadDockerConfig(listContainers(dockerClient)) configurationChan <- types.ConfigMessage{ ProviderName: "docker", Configuration: configuration, } return nil } func (provider *Docker) loadDockerConfig(containersInspected []docker.Container) *types.Configuration { var DockerFuncMap = template.FuncMap{ "getBackend": provider.getBackend, "getPort": provider.getPort, "getWeight": provider.getWeight, "getDomain": provider.getDomain, "getProtocol": provider.getProtocol, "getPassHostHeader": provider.getPassHostHeader, "getFrontendValue": provider.getFrontendValue, "getFrontendRule": provider.getFrontendRule, "replace": replace, } // filter containers filteredContainers := fun.Filter(containerFilter, containersInspected).([]docker.Container) frontends := map[string][]docker.Container{} for _, container := range filteredContainers { frontends[provider.getFrontendName(container)] = append(frontends[provider.getFrontendName(container)], container) } templateObjects := struct { Containers []docker.Container Frontends map[string][]docker.Container Domain string }{ filteredContainers, frontends, provider.Domain, } configuration, err := provider.getConfiguration("templates/docker.tmpl", DockerFuncMap, templateObjects) if err != nil { log.Error(err) } return configuration } func containerFilter(container docker.Container) bool { if len(container.NetworkSettings.Ports) == 0 { log.Debugf("Filtering container without port %s", container.Name) return false } _, err := strconv.Atoi(container.Config.Labels["traefik.port"]) if len(container.NetworkSettings.Ports) > 1 && err != nil { log.Debugf("Filtering container with more than 1 port and no traefik.port label %s", container.Name) return false } if container.Config.Labels["traefik.enable"] == "false" { log.Debugf("Filtering disabled container %s", container.Name) return false } labels, err := getLabels(container, []string{"traefik.frontend.rule", "traefik.frontend.value"}) if len(labels) != 0 && err != nil { log.Debugf("Filtering bad labeled container %s", container.Name) return false } return true } func (provider *Docker) getFrontendName(container docker.Container) string { // Replace '.' with '-' in quoted keys because of this issue https://github.com/BurntSushi/toml/issues/78 frontendName := fmt.Sprintf("%s-%s", provider.getFrontendRule(container), provider.getFrontendValue(container)) frontendName = strings.Replace(frontendName, "[", "", -1) frontendName = strings.Replace(frontendName, "]", "", -1) return strings.Replace(frontendName, ".", "-", -1) } // GetFrontendValue returns the frontend value for the specified container, using // it's label. It returns a default one if the label is not present. func (provider *Docker) getFrontendValue(container docker.Container) string { if label, err := getLabel(container, "traefik.frontend.value"); err == nil { return label } return getEscapedName(container.Name) + "." + provider.Domain } // GetFrontendRule returns the frontend rule for the specified container, using // it's label. It returns a default one (Host) if the label is not present. func (provider *Docker) getFrontendRule(container docker.Container) string { if label, err := getLabel(container, "traefik.frontend.rule"); err == nil { return label } return "Host" } func (provider *Docker) getBackend(container docker.Container) string { if label, err := getLabel(container, "traefik.backend"); err == nil { return label } return getEscapedName(container.Name) } func (provider *Docker) getPort(container docker.Container) string { if label, err := getLabel(container, "traefik.port"); err == nil { return label } for key := range container.NetworkSettings.Ports { return key.Port() } return "" } func (provider *Docker) getWeight(container docker.Container) string { if label, err := getLabel(container, "traefik.weight"); err == nil { return label } return "0" } func (provider *Docker) getDomain(container docker.Container) string { if label, err := getLabel(container, "traefik.domain"); err == nil { return label } return provider.Domain } func (provider *Docker) getProtocol(container docker.Container) string { if label, err := getLabel(container, "traefik.protocol"); err == nil { return label } return "http" } func (provider *Docker) getPassHostHeader(container docker.Container) string { if passHostHeader, err := getLabel(container, "traefik.frontend.passHostHeader"); err == nil { return passHostHeader } return "false" } func getLabel(container docker.Container, label string) (string, error) { for key, value := range container.Config.Labels { if key == label { return value, nil } } return "", errors.New("Label not found:" + label) } func getLabels(container docker.Container, labels []string) (map[string]string, error) { var globalErr error foundLabels := map[string]string{} for _, label := range labels { foundLabel, err := getLabel(container, label) // Error out only if one of them is defined. if err != nil { globalErr = errors.New("Label not found: " + label) continue } foundLabels[label] = foundLabel } return foundLabels, globalErr } func listContainers(dockerClient *docker.Client) []docker.Container { containerList, _ := dockerClient.ListContainers(docker.ListContainersOptions{}) containersInspected := []docker.Container{} // get inspect containers for _, container := range containerList { containerInspected, _ := dockerClient.InspectContainer(container.ID) containersInspected = append(containersInspected, *containerInspected) } return containersInspected }