339 lines
10 KiB
Go
339 lines
10 KiB
Go
package provider
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import (
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"errors"
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"net/url"
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"strconv"
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"strings"
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"text/template"
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"crypto/tls"
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"github.com/BurntSushi/ty/fun"
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log "github.com/Sirupsen/logrus"
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"github.com/emilevauge/traefik/types"
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"github.com/gambol99/go-marathon"
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"net/http"
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)
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// Marathon holds configuration of the Marathon provider.
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type Marathon struct {
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BaseProvider `mapstructure:",squash"`
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Endpoint string
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Domain string
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NetworkInterface string
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Basic *MarathonBasic
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TLS *tls.Config
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marathonClient marathon.Marathon
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}
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// MarathonBasic holds basic authentication specific configurations
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type MarathonBasic struct {
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HTTPBasicAuthUser string
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HTTPBasicPassword string
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}
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type lightMarathonClient interface {
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Applications(url.Values) (*marathon.Applications, error)
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AllTasks(v url.Values) (*marathon.Tasks, error)
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}
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// Provide allows the provider to provide configurations to traefik
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// using the given configuration channel.
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func (provider *Marathon) Provide(configurationChan chan<- types.ConfigMessage) error {
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config := marathon.NewDefaultConfig()
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config.URL = provider.Endpoint
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config.EventsInterface = provider.NetworkInterface
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if provider.Basic != nil {
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config.HTTPBasicAuthUser = provider.Basic.HTTPBasicAuthUser
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config.HTTPBasicPassword = provider.Basic.HTTPBasicPassword
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}
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config.HTTPClient = &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: provider.TLS,
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},
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}
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client, err := marathon.NewClient(config)
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if err != nil {
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log.Errorf("Failed to create a client for marathon, error: %s", err)
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return err
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}
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provider.marathonClient = client
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update := make(marathon.EventsChannel, 5)
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if provider.Watch {
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if err := client.AddEventsListener(update, marathon.EVENTS_APPLICATIONS); err != nil {
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log.Errorf("Failed to register for subscriptions, %s", err)
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} else {
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go func() {
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for {
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event := <-update
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log.Debug("Marathon event receveived", event)
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configuration := provider.loadMarathonConfig()
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if configuration != nil {
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configurationChan <- types.ConfigMessage{
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ProviderName: "marathon",
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Configuration: configuration,
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}
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}
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}
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}()
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}
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}
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configuration := provider.loadMarathonConfig()
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configurationChan <- types.ConfigMessage{
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ProviderName: "marathon",
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Configuration: configuration,
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}
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return nil
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}
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func (provider *Marathon) loadMarathonConfig() *types.Configuration {
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var MarathonFuncMap = template.FuncMap{
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"getBackend": provider.getBackend,
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"getPort": provider.getPort,
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"getWeight": provider.getWeight,
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"getDomain": provider.getDomain,
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"getProtocol": provider.getProtocol,
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"getPassHostHeader": provider.getPassHostHeader,
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"getEntryPoints": provider.getEntryPoints,
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"getFrontendValue": provider.getFrontendValue,
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"getFrontendRule": provider.getFrontendRule,
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"getFrontendBackend": provider.getFrontendBackend,
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"replace": replace,
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}
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applications, err := provider.marathonClient.Applications(nil)
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if err != nil {
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log.Errorf("Failed to create a client for marathon, error: %s", err)
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return nil
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}
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tasks, err := provider.marathonClient.AllTasks(&marathon.AllTasksOpts{Status: "running"})
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if err != nil {
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log.Errorf("Failed to create a client for marathon, error: %s", err)
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return nil
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}
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//filter tasks
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filteredTasks := fun.Filter(func(task marathon.Task) bool {
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return taskFilter(task, applications)
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}, tasks.Tasks).([]marathon.Task)
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//filter apps
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filteredApps := fun.Filter(func(app marathon.Application) bool {
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return applicationFilter(app, filteredTasks)
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}, applications.Apps).([]marathon.Application)
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templateObjects := struct {
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Applications []marathon.Application
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Tasks []marathon.Task
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Domain string
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}{
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filteredApps,
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filteredTasks,
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provider.Domain,
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}
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configuration, err := provider.getConfiguration("templates/marathon.tmpl", MarathonFuncMap, templateObjects)
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if err != nil {
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log.Error(err)
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}
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return configuration
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}
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func taskFilter(task marathon.Task, applications *marathon.Applications) bool {
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if len(task.Ports) == 0 {
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log.Debug("Filtering marathon task without port %s", task.AppID)
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return false
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}
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application, err := getApplication(task, applications.Apps)
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if err != nil {
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log.Errorf("Unable to get marathon application from task %s", task.AppID)
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return false
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}
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if application.Labels["traefik.enable"] == "false" {
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log.Debugf("Filtering disabled marathon task %s", task.AppID)
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return false
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}
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//filter indeterminable task port
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portIndexLabel := application.Labels["traefik.portIndex"]
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portValueLabel := application.Labels["traefik.port"]
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if portIndexLabel != "" && portValueLabel != "" {
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log.Debugf("Filtering marathon task %s specifying both traefik.portIndex and traefik.port labels", task.AppID)
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return false
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}
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if portIndexLabel == "" && portValueLabel == "" && len(application.Ports) > 1 {
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log.Debugf("Filtering marathon task %s with more than 1 port and no traefik.portIndex or traefik.port label", task.AppID)
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return false
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}
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if portIndexLabel != "" {
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index, err := strconv.Atoi(application.Labels["traefik.portIndex"])
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if err != nil || index < 0 || index > len(application.Ports)-1 {
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log.Debugf("Filtering marathon task %s with unexpected value for traefik.portIndex label", task.AppID)
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return false
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}
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}
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if portValueLabel != "" {
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port, err := strconv.Atoi(application.Labels["traefik.port"])
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if err != nil {
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log.Debugf("Filtering marathon task %s with unexpected value for traefik.port label", task.AppID)
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return false
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}
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var foundPort bool
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for _, exposedPort := range task.Ports {
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if port == exposedPort {
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foundPort = true
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break
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}
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}
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if !foundPort {
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log.Debugf("Filtering marathon task %s without a matching port for traefik.port label", task.AppID)
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return false
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}
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}
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//filter healthchecks
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if application.HasHealthChecks() {
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if task.HasHealthCheckResults() {
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for _, healthcheck := range task.HealthCheckResults {
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// found one bad healthcheck, return false
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if !healthcheck.Alive {
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log.Debugf("Filtering marathon task %s with bad healthcheck", task.AppID)
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return false
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}
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}
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} else {
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log.Debugf("Filtering marathon task %s with bad healthcheck", task.AppID)
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return false
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}
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}
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return true
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}
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func applicationFilter(app marathon.Application, filteredTasks []marathon.Task) bool {
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return fun.Exists(func(task marathon.Task) bool {
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return task.AppID == app.ID
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}, filteredTasks)
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}
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func getApplication(task marathon.Task, apps []marathon.Application) (marathon.Application, error) {
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for _, application := range apps {
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if application.ID == task.AppID {
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return application, nil
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}
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}
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return marathon.Application{}, errors.New("Application not found: " + task.AppID)
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}
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func (provider *Marathon) getLabel(application marathon.Application, label string) (string, error) {
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for key, value := range application.Labels {
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if key == label {
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return value, nil
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}
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}
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return "", errors.New("Label not found:" + label)
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}
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func (provider *Marathon) getPort(task marathon.Task, applications []marathon.Application) string {
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application, err := getApplication(task, applications)
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if err != nil {
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log.Errorf("Unable to get marathon application from task %s", task.AppID)
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return ""
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}
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if portIndexLabel, err := provider.getLabel(application, "traefik.portIndex"); err == nil {
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if index, err := strconv.Atoi(portIndexLabel); err == nil {
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return strconv.Itoa(task.Ports[index])
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}
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}
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if portValueLabel, err := provider.getLabel(application, "traefik.port"); err == nil {
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return portValueLabel
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}
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for _, port := range task.Ports {
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return strconv.Itoa(port)
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}
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return ""
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}
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func (provider *Marathon) getWeight(task marathon.Task, applications []marathon.Application) string {
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application, errApp := getApplication(task, applications)
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if errApp != nil {
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log.Errorf("Unable to get marathon application from task %s", task.AppID)
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return "0"
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}
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if label, err := provider.getLabel(application, "traefik.weight"); err == nil {
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return label
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}
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return "0"
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}
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func (provider *Marathon) getDomain(application marathon.Application) string {
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if label, err := provider.getLabel(application, "traefik.domain"); err == nil {
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return label
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}
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return provider.Domain
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}
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func (provider *Marathon) getProtocol(task marathon.Task, applications []marathon.Application) string {
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application, errApp := getApplication(task, applications)
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if errApp != nil {
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log.Errorf("Unable to get marathon application from task %s", task.AppID)
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return "http"
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}
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if label, err := provider.getLabel(application, "traefik.protocol"); err == nil {
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return label
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}
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return "http"
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}
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func (provider *Marathon) getPassHostHeader(application marathon.Application) string {
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if passHostHeader, err := provider.getLabel(application, "traefik.frontend.passHostHeader"); err == nil {
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return passHostHeader
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}
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return "false"
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}
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func (provider *Marathon) getEntryPoints(application marathon.Application) []string {
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if entryPoints, err := provider.getLabel(application, "traefik.frontend.entryPoints"); err == nil {
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return strings.Split(entryPoints, ",")
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}
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return []string{}
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}
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// getFrontendValue returns the frontend value for the specified application, using
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// it's label. It returns a default one if the label is not present.
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func (provider *Marathon) getFrontendValue(application marathon.Application) string {
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if label, err := provider.getLabel(application, "traefik.frontend.value"); err == nil {
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return label
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}
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return getEscapedName(application.ID) + "." + provider.Domain
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}
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// getFrontendRule returns the frontend rule for the specified application, using
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// it's label. It returns a default one (Host) if the label is not present.
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func (provider *Marathon) getFrontendRule(application marathon.Application) string {
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if label, err := provider.getLabel(application, "traefik.frontend.rule"); err == nil {
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return label
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}
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return "Host"
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}
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func (provider *Marathon) getBackend(task marathon.Task, applications []marathon.Application) string {
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application, errApp := getApplication(task, applications)
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if errApp != nil {
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log.Errorf("Unable to get marathon application from task %s", task.AppID)
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return ""
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}
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return provider.getFrontendBackend(application)
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}
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func (provider *Marathon) getFrontendBackend(application marathon.Application) string {
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if label, err := provider.getLabel(application, "traefik.backend"); err == nil {
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return label
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}
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return replace("/", "-", application.ID)
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}
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