494 lines
16 KiB
Go
494 lines
16 KiB
Go
package provider
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import (
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"errors"
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"net"
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"net/url"
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"sort"
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"strconv"
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"strings"
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"text/template"
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"math"
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"net/http"
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"time"
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"github.com/BurntSushi/ty/fun"
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"github.com/cenk/backoff"
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"github.com/containous/traefik/job"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/types"
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"github.com/gambol99/go-marathon"
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)
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var _ Provider = (*Marathon)(nil)
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// Marathon holds configuration of the Marathon provider.
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type Marathon struct {
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BaseProvider
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Endpoint string `description:"Marathon server endpoint. You can also specify multiple endpoint for Marathon"`
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Domain string `description:"Default domain used"`
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ExposedByDefault bool `description:"Expose Marathon apps by default"`
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GroupsAsSubDomains bool `description:"Convert Marathon groups to subdomains"`
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DCOSToken string `description:"DCOSToken for DCOS environment, This will override the Authorization header"`
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MarathonLBCompatibility bool `description:"Add compatibility with marathon-lb labels"`
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TLS *ClientTLS `description:"Enable Docker TLS support"`
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DialerTimeout time.Duration `description:"Set a non-default connection timeout for Marathon"`
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Basic *MarathonBasic
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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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AllTasks(v url.Values) (*marathon.Tasks, error)
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Applications(url.Values) (*marathon.Applications, 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, pool *safe.Pool, constraints []types.Constraint) error {
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provider.Constraints = append(provider.Constraints, constraints...)
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operation := func() error {
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config := marathon.NewDefaultConfig()
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config.URL = provider.Endpoint
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config.EventsTransport = marathon.EventsTransportSSE
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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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if len(provider.DCOSToken) > 0 {
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config.DCOSToken = provider.DCOSToken
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}
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TLSConfig, err := provider.TLS.CreateTLSConfig()
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if err != nil {
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return err
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}
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config.HTTPClient = &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: TLSConfig,
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DialContext: (&net.Dialer{
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Timeout: time.Second * provider.DialerTimeout,
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}).DialContext,
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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.EventIDApplications); err != nil {
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log.Errorf("Failed to register for events, %s", err)
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return err
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}
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pool.Go(func(stop chan bool) {
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defer close(update)
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for {
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select {
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case <-stop:
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return
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case 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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notify := func(err error, time time.Duration) {
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log.Errorf("Marathon connection error %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
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if err != nil {
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log.Errorf("Cannot connect to Marathon server %+v", err)
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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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"getPriority": provider.getPriority,
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"getEntryPoints": provider.getEntryPoints,
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"getFrontendRule": provider.getFrontendRule,
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"getFrontendBackend": provider.getFrontendBackend,
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"replace": replace,
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"hasCircuitBreakerLabels": provider.hasCircuitBreakerLabels,
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"hasLoadBalancerLabels": provider.hasLoadBalancerLabels,
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"hasMaxConnLabels": provider.hasMaxConnLabels,
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"getMaxConnExtractorFunc": provider.getMaxConnExtractorFunc,
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"getMaxConnAmount": provider.getMaxConnAmount,
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"getLoadBalancerMethod": provider.getLoadBalancerMethod,
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"getCircuitBreakerExpression": provider.getCircuitBreakerExpression,
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"getSticky": provider.getSticky,
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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 provider.taskFilter(task, applications, provider.ExposedByDefault)
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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 provider.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 (provider *Marathon) taskFilter(task marathon.Task, applications *marathon.Applications, exposedByDefaultFlag bool) 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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label, _ := provider.getLabel(application, "traefik.tags")
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constraintTags := strings.Split(label, ",")
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if provider.MarathonLBCompatibility {
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if label, err := provider.getLabel(application, "HAPROXY_GROUP"); err == nil {
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constraintTags = append(constraintTags, label)
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}
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}
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if ok, failingConstraint := provider.MatchConstraints(constraintTags); !ok {
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if failingConstraint != nil {
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log.Debugf("Application %v pruned by '%v' constraint", application.ID, failingConstraint.String())
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}
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return false
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}
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if !isApplicationEnabled(application, exposedByDefaultFlag) {
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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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}
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}
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return true
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}
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func (provider *Marathon) applicationFilter(app marathon.Application, filteredTasks []marathon.Task) bool {
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label, _ := provider.getLabel(app, "traefik.tags")
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constraintTags := strings.Split(label, ",")
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if provider.MarathonLBCompatibility {
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if label, err := provider.getLabel(app, "HAPROXY_GROUP"); err == nil {
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constraintTags = append(constraintTags, label)
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}
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}
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if ok, failingConstraint := provider.MatchConstraints(constraintTags); !ok {
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if failingConstraint != nil {
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log.Debugf("Application %v pruned by '%v' constraint", app.ID, failingConstraint.String())
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}
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return false
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}
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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 isApplicationEnabled(application marathon.Application, exposedByDefault bool) bool {
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return exposedByDefault && (*application.Labels)["traefik.enable"] != "false" || (*application.Labels)["traefik.enable"] == "true"
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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) getSticky(application marathon.Application) string {
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if sticky, err := provider.getLabel(application, "traefik.backend.loadbalancer.sticky"); err == nil {
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return sticky
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}
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return "false"
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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 "true"
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}
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func (provider *Marathon) getPriority(application marathon.Application) string {
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if priority, err := provider.getLabel(application, "traefik.frontend.priority"); err == nil {
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return priority
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}
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return "0"
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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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// 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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if provider.MarathonLBCompatibility {
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if label, err := provider.getLabel(application, "HAPROXY_0_VHOST"); err == nil {
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return "Host:" + label
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}
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}
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return "Host:" + provider.getSubDomain(application.ID) + "." + provider.Domain
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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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func (provider *Marathon) getSubDomain(name string) string {
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if provider.GroupsAsSubDomains {
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splitedName := strings.Split(strings.TrimPrefix(name, "/"), "/")
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sort.Sort(sort.Reverse(sort.StringSlice(splitedName)))
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reverseName := strings.Join(splitedName, ".")
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return reverseName
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}
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return strings.Replace(strings.TrimPrefix(name, "/"), "/", "-", -1)
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}
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func (provider *Marathon) hasCircuitBreakerLabels(application marathon.Application) bool {
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if _, err := provider.getLabel(application, "traefik.backend.circuitbreaker.expression"); err != nil {
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return false
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}
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return true
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}
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func (provider *Marathon) hasLoadBalancerLabels(application marathon.Application) bool {
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_, errMethod := provider.getLabel(application, "traefik.backend.loadbalancer.method")
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_, errSticky := provider.getLabel(application, "traefik.backend.loadbalancer.sticky")
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if errMethod != nil && errSticky != nil {
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return false
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}
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return true
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}
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func (provider *Marathon) hasMaxConnLabels(application marathon.Application) bool {
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if _, err := provider.getLabel(application, "traefik.backend.maxconn.amount"); err != nil {
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return false
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}
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if _, err := provider.getLabel(application, "traefik.backend.maxconn.extractorfunc"); err != nil {
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return false
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}
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return true
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}
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func (provider *Marathon) getMaxConnAmount(application marathon.Application) int64 {
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if label, err := provider.getLabel(application, "traefik.backend.maxconn.amount"); err == nil {
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i, errConv := strconv.ParseInt(label, 10, 64)
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if errConv != nil {
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log.Errorf("Unable to parse traefik.backend.maxconn.amount %s", label)
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return math.MaxInt64
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}
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return i
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}
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return math.MaxInt64
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}
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func (provider *Marathon) getMaxConnExtractorFunc(application marathon.Application) string {
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if label, err := provider.getLabel(application, "traefik.backend.maxconn.extractorfunc"); err == nil {
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return label
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}
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return "request.host"
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}
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func (provider *Marathon) getLoadBalancerMethod(application marathon.Application) string {
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if label, err := provider.getLabel(application, "traefik.backend.loadbalancer.method"); err == nil {
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return label
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}
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return "wrr"
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}
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func (provider *Marathon) getCircuitBreakerExpression(application marathon.Application) string {
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if label, err := provider.getLabel(application, "traefik.backend.circuitbreaker.expression"); err == nil {
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return label
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}
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return "NetworkErrorRatio() > 1"
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}
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