package provider import ( "errors" "net/url" "sort" "strconv" "strings" "text/template" "github.com/BurntSushi/ty/fun" log "github.com/Sirupsen/logrus" "github.com/containous/traefik/safe" "github.com/containous/traefik/types" "github.com/emilevauge/backoff" "github.com/gambol99/go-marathon" "net/http" "time" ) // Marathon holds configuration of the Marathon provider. type Marathon struct { BaseProvider Endpoint string `description:"Marathon server endpoint. You can also specify multiple endpoint for Marathon"` Domain string `description:"Default domain used"` ExposedByDefault bool `description:"Expose Marathon apps by default"` GroupsAsSubDomains bool `description:"Convert Marathon groups to subdomains"` DCOSToken string `description:"DCOSToken for DCOS environment, This will override the Authorization header"` TLS *ClientTLS `description:"Enable Docker TLS support"` Basic *MarathonBasic marathonClient marathon.Marathon } // MarathonBasic holds basic authentication specific configurations type MarathonBasic struct { HTTPBasicAuthUser string HTTPBasicPassword string } type lightMarathonClient interface { AllTasks(v url.Values) (*marathon.Tasks, error) Applications(url.Values) (*marathon.Applications, error) } // Provide allows the provider to provide configurations to traefik // using the given configuration channel. func (provider *Marathon) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints []types.Constraint) error { provider.Constraints = append(provider.Constraints, constraints...) operation := func() error { config := marathon.NewDefaultConfig() config.URL = provider.Endpoint config.EventsTransport = marathon.EventsTransportSSE if provider.Basic != nil { config.HTTPBasicAuthUser = provider.Basic.HTTPBasicAuthUser config.HTTPBasicPassword = provider.Basic.HTTPBasicPassword } if len(provider.DCOSToken) > 0 { config.DCOSToken = provider.DCOSToken } TLSConfig, err := provider.TLS.CreateTLSConfig() if err != nil { return err } config.HTTPClient = &http.Client{ Transport: &http.Transport{ TLSClientConfig: TLSConfig, }, } client, err := marathon.NewClient(config) if err != nil { log.Errorf("Failed to create a client for marathon, error: %s", err) return err } provider.marathonClient = client update := make(marathon.EventsChannel, 5) if provider.Watch { if err := client.AddEventsListener(update, marathon.EventIDApplications); err != nil { log.Errorf("Failed to register for events, %s", err) return err } pool.Go(func(stop chan bool) { defer close(update) for { select { case <-stop: return case event := <-update: log.Debug("Marathon event receveived", event) configuration := provider.loadMarathonConfig() if configuration != nil { configurationChan <- types.ConfigMessage{ ProviderName: "marathon", Configuration: configuration, } } } } }) } configuration := provider.loadMarathonConfig() configurationChan <- types.ConfigMessage{ ProviderName: "marathon", Configuration: configuration, } return nil } notify := func(err error, time time.Duration) { log.Errorf("Marathon connection error %+v, retrying in %s", err, time) } err := backoff.RetryNotify(operation, backoff.NewJobBackOff(backoff.NewExponentialBackOff()), notify) if err != nil { log.Errorf("Cannot connect to Marathon server %+v", err) } return nil } 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, "replace": replace, } 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 taskFilter(task, applications, provider.ExposedByDefault) }, tasks.Tasks).([]marathon.Task) //filter apps filteredApps := fun.Filter(func(app marathon.Application) bool { return 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 taskFilter(task marathon.Task, applications *marathon.Applications, exposedByDefaultFlag bool) bool { if len(task.Ports) == 0 { log.Debug("Filtering marathon task without port %s", task.AppID) return false } application, err := getApplication(task, applications.Apps) if err != nil { log.Errorf("Unable to get marathon application from task %s", task.AppID) return false } if !isApplicationEnabled(application, exposedByDefaultFlag) { log.Debugf("Filtering disabled marathon task %s", task.AppID) return false } //filter indeterminable task port portIndexLabel := (*application.Labels)["traefik.portIndex"] portValueLabel := (*application.Labels)["traefik.port"] if portIndexLabel != "" && portValueLabel != "" { log.Debugf("Filtering marathon task %s specifying both traefik.portIndex and traefik.port labels", task.AppID) return false } if portIndexLabel == "" && portValueLabel == "" && len(application.Ports) > 1 { log.Debugf("Filtering marathon task %s with more than 1 port and no traefik.portIndex or traefik.port label", task.AppID) return false } if portIndexLabel != "" { index, err := strconv.Atoi((*application.Labels)["traefik.portIndex"]) if err != nil || index < 0 || index > len(application.Ports)-1 { log.Debugf("Filtering marathon task %s with unexpected value for traefik.portIndex label", task.AppID) return false } } if portValueLabel != "" { port, err := strconv.Atoi((*application.Labels)["traefik.port"]) if err != nil { log.Debugf("Filtering marathon task %s with unexpected value for traefik.port label", task.AppID) return false } var foundPort bool for _, exposedPort := range task.Ports { if port == exposedPort { foundPort = true break } } if !foundPort { log.Debugf("Filtering marathon task %s without a matching port for traefik.port label", task.AppID) return false } } //filter healthchecks if application.HasHealthChecks() { if task.HasHealthCheckResults() { for _, healthcheck := range task.HealthCheckResults { // found one bad healthcheck, return false if !healthcheck.Alive { log.Debugf("Filtering marathon task %s with bad healthcheck", task.AppID) return false } } } } return true } func applicationFilter(app marathon.Application, filteredTasks []marathon.Task) bool { return fun.Exists(func(task marathon.Task) bool { return task.AppID == app.ID }, filteredTasks) } func getApplication(task marathon.Task, apps []marathon.Application) (marathon.Application, error) { for _, application := range apps { if application.ID == task.AppID { return application, nil } } return marathon.Application{}, errors.New("Application not found: " + task.AppID) } func isApplicationEnabled(application marathon.Application, exposedByDefault bool) bool { return exposedByDefault && (*application.Labels)["traefik.enable"] != "false" || (*application.Labels)["traefik.enable"] == "true" } func (provider *Marathon) getLabel(application marathon.Application, label string) (string, error) { for key, value := range *application.Labels { if key == label { return value, nil } } return "", errors.New("Label not found:" + label) } func (provider *Marathon) getPort(task marathon.Task, applications []marathon.Application) string { application, err := getApplication(task, applications) if err != nil { log.Errorf("Unable to get marathon application from task %s", task.AppID) return "" } if portIndexLabel, err := provider.getLabel(application, "traefik.portIndex"); err == nil { if index, err := strconv.Atoi(portIndexLabel); err == nil { return strconv.Itoa(task.Ports[index]) } } if portValueLabel, err := provider.getLabel(application, "traefik.port"); err == nil { return portValueLabel } for _, port := range task.Ports { return strconv.Itoa(port) } return "" } func (provider *Marathon) getWeight(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 "0" } if label, err := provider.getLabel(application, "traefik.weight"); err == nil { return label } return "0" } func (provider *Marathon) getDomain(application marathon.Application) string { if label, err := provider.getLabel(application, "traefik.domain"); err == nil { return label } return provider.Domain } func (provider *Marathon) getProtocol(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 "http" } if label, err := provider.getLabel(application, "traefik.protocol"); err == nil { return label } return "http" } func (provider *Marathon) getPassHostHeader(application marathon.Application) string { if passHostHeader, err := provider.getLabel(application, "traefik.frontend.passHostHeader"); err == nil { return passHostHeader } return "true" } func (provider *Marathon) getPriority(application marathon.Application) string { if priority, err := provider.getLabel(application, "traefik.frontend.priority"); err == nil { return priority } return "0" } func (provider *Marathon) getEntryPoints(application marathon.Application) []string { if entryPoints, err := provider.getLabel(application, "traefik.frontend.entryPoints"); err == nil { return strings.Split(entryPoints, ",") } return []string{} } // getFrontendRule returns the frontend rule for the specified application, using // it's label. It returns a default one (Host) if the label is not present. func (provider *Marathon) getFrontendRule(application marathon.Application) string { if label, err := provider.getLabel(application, "traefik.frontend.rule"); err == nil { return label } return "Host:" + provider.getSubDomain(application.ID) + "." + provider.Domain } 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 *Marathon) getFrontendBackend(application marathon.Application) string { if label, err := provider.getLabel(application, "traefik.backend"); err == nil { return label } return replace("/", "-", application.ID) } func (provider *Marathon) getSubDomain(name string) string { if provider.GroupsAsSubDomains { splitedName := strings.Split(strings.TrimPrefix(name, "/"), "/") sort.Sort(sort.Reverse(sort.StringSlice(splitedName))) reverseName := strings.Join(splitedName, ".") return reverseName } return strings.Replace(strings.TrimPrefix(name, "/"), "/", "-", -1) }