597 lines
19 KiB
Go
597 lines
19 KiB
Go
package marathon
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import (
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"errors"
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"fmt"
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"math"
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"net"
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"net/http"
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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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"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/flaeg"
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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/provider"
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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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const (
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labelPort = "traefik.port"
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labelPortIndex = "traefik.portIndex"
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labelBackendHealthCheckPath = "traefik.backend.healthcheck.path"
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labelBackendHealthCheckInterval = "traefik.backend.healthcheck.interval"
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)
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var _ provider.Provider = (*Provider)(nil)
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// Provider holds configuration of the provider.
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type Provider struct {
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provider.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 *provider.ClientTLS `description:"Enable Docker TLS support"`
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DialerTimeout flaeg.Duration `description:"Set a non-default connection timeout for Marathon"`
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KeepAlive flaeg.Duration `description:"Set a non-default TCP Keep Alive time in seconds"`
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ForceTaskHostname bool `description:"Force to use the task's hostname."`
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Basic *Basic `description:"Enable basic authentication"`
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marathonClient marathon.Marathon
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}
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// Basic holds basic authentication specific configurations
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type Basic struct {
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HTTPBasicAuthUser string `description:"Basic authentication User"`
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HTTPBasicPassword string `description:"Basic authentication Password"`
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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 marathon provider to provide configurations to traefik
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// using the given configuration channel.
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func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
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p.Constraints = append(p.Constraints, constraints...)
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operation := func() error {
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config := marathon.NewDefaultConfig()
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config.URL = p.Endpoint
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config.EventsTransport = marathon.EventsTransportSSE
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if p.Basic != nil {
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config.HTTPBasicAuthUser = p.Basic.HTTPBasicAuthUser
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config.HTTPBasicPassword = p.Basic.HTTPBasicPassword
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}
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if len(p.DCOSToken) > 0 {
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config.DCOSToken = p.DCOSToken
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}
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TLSConfig, err := p.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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DialContext: (&net.Dialer{
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KeepAlive: time.Duration(p.KeepAlive),
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Timeout: time.Duration(p.DialerTimeout),
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}).DialContext,
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TLSClientConfig: TLSConfig,
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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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p.marathonClient = client
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if p.Watch {
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update, err := client.AddEventsListener(marathon.EventIDApplications)
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if 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("Provider event received", event)
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configuration := p.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 := p.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("Provider connection error %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), job.NewBackOff(backoff.NewExponentialBackOff()), notify)
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if err != nil {
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log.Errorf("Cannot connect to Provider server %+v", err)
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}
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return nil
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}
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func (p *Provider) loadMarathonConfig() *types.Configuration {
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var MarathonFuncMap = template.FuncMap{
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"getBackend": p.getBackend,
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"getBackendServer": p.getBackendServer,
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"getPort": p.getPort,
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"getWeight": p.getWeight,
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"getDomain": p.getDomain,
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"getSubDomain": p.getSubDomain,
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"getProtocol": p.getProtocol,
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"getPassHostHeader": p.getPassHostHeader,
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"getPriority": p.getPriority,
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"getEntryPoints": p.getEntryPoints,
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"getFrontendRule": p.getFrontendRule,
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"getFrontendBackend": p.getFrontendBackend,
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"hasCircuitBreakerLabels": p.hasCircuitBreakerLabels,
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"hasLoadBalancerLabels": p.hasLoadBalancerLabels,
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"hasMaxConnLabels": p.hasMaxConnLabels,
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"getMaxConnExtractorFunc": p.getMaxConnExtractorFunc,
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"getMaxConnAmount": p.getMaxConnAmount,
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"getLoadBalancerMethod": p.getLoadBalancerMethod,
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"getCircuitBreakerExpression": p.getCircuitBreakerExpression,
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"getSticky": p.getSticky,
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"hasHealthCheckLabels": p.hasHealthCheckLabels,
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"getHealthCheckPath": p.getHealthCheckPath,
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"getHealthCheckInterval": p.getHealthCheckInterval,
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"getBasicAuth": p.getBasicAuth,
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}
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applications, err := p.marathonClient.Applications(nil)
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if err != nil {
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log.Errorf("Failed to retrieve applications from Marathon, error: %s", err)
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return nil
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}
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tasks, err := p.marathonClient.AllTasks(&marathon.AllTasksOpts{Status: "running"})
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if err != nil {
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log.Errorf("Failed to retrieve task from 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 p.taskFilter(task, applications, p.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 p.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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p.Domain,
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}
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configuration, err := p.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 (p *Provider) taskFilter(task marathon.Task, applications *marathon.Applications, exposedByDefaultFlag bool) bool {
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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 %s for task %s", task.AppID, task.ID)
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return false
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}
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if _, err = processPorts(application, task); err != nil {
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log.Errorf("Filtering Marathon task %s from application %s without port: %s", task.ID, application.ID, err)
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return false
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}
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// Filter illegal port label specification.
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_, hasPortIndexLabel := p.getLabel(application, labelPortIndex)
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_, hasPortLabel := p.getLabel(application, labelPort)
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if hasPortIndexLabel && hasPortLabel {
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log.Debugf("Filtering Marathon task %s from application %s specifying both traefik.portIndex and traefik.port labels", task.ID, application.ID)
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return false
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}
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// Filter by constraints.
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label, _ := p.getLabel(application, "traefik.tags")
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constraintTags := strings.Split(label, ",")
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if p.MarathonLBCompatibility {
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if label, ok := p.getLabel(application, "HAPROXY_GROUP"); ok {
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constraintTags = append(constraintTags, label)
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}
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}
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if ok, failingConstraint := p.MatchConstraints(constraintTags); !ok {
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if failingConstraint != nil {
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log.Debugf("Filtering Marathon task %s from application %s pruned by '%v' constraint", task.ID, application.ID, failingConstraint.String())
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}
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return false
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}
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// Filter disabled application.
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if !isApplicationEnabled(application, exposedByDefaultFlag) {
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log.Debugf("Filtering disabled Marathon task %s from application %s", task.ID, application.ID)
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return false
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}
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// Filter task with existing, bad health check results.
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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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if !healthcheck.Alive {
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log.Debugf("Filtering Marathon task %s from application %s with bad health check", task.ID, application.ID)
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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 (p *Provider) applicationFilter(app marathon.Application, filteredTasks []marathon.Task) bool {
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label, _ := p.getLabel(app, "traefik.tags")
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constraintTags := strings.Split(label, ",")
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if p.MarathonLBCompatibility {
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if label, ok := p.getLabel(app, "HAPROXY_GROUP"); ok {
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constraintTags = append(constraintTags, label)
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}
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}
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if ok, failingConstraint := p.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 (p *Provider) getLabel(application marathon.Application, label string) (string, bool) {
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for key, value := range *application.Labels {
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if key == label {
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return value, true
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}
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}
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return "", false
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}
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func (p *Provider) 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 %s for task %s", application.ID, task.ID)
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return ""
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}
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port, err := processPorts(application, task)
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if err != nil {
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log.Errorf("Unable to process ports for Marathon application %s and task %s: %s", application.ID, task.ID, err)
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return ""
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}
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return strconv.Itoa(port)
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}
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func (p *Provider) 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, ok := p.getLabel(application, "traefik.weight"); ok {
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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 (p *Provider) getDomain(application marathon.Application) string {
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if label, ok := p.getLabel(application, "traefik.domain"); ok {
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return label
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}
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return p.Domain
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}
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func (p *Provider) 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, ok := p.getLabel(application, "traefik.protocol"); ok {
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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 (p *Provider) getSticky(application marathon.Application) string {
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if sticky, ok := p.getLabel(application, "traefik.backend.loadbalancer.sticky"); ok {
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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 (p *Provider) getPassHostHeader(application marathon.Application) string {
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if passHostHeader, ok := p.getLabel(application, "traefik.frontend.passHostHeader"); ok {
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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 (p *Provider) getPriority(application marathon.Application) string {
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if priority, ok := p.getLabel(application, "traefik.frontend.priority"); ok {
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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 (p *Provider) getEntryPoints(application marathon.Application) []string {
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if entryPoints, ok := p.getLabel(application, "traefik.frontend.entryPoints"); ok {
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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 (p *Provider) getFrontendRule(application marathon.Application) string {
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if label, ok := p.getLabel(application, "traefik.frontend.rule"); ok {
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return label
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}
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if p.MarathonLBCompatibility {
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if label, ok := p.getLabel(application, "HAPROXY_0_VHOST"); ok {
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return "Host:" + label
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}
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}
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return "Host:" + p.getSubDomain(application.ID) + "." + p.Domain
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}
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func (p *Provider) 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 p.getFrontendBackend(application)
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}
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func (p *Provider) getFrontendBackend(application marathon.Application) string {
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if label, ok := p.getLabel(application, "traefik.backend"); ok {
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return label
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}
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return provider.Replace("/", "-", application.ID)
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}
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func (p *Provider) getSubDomain(name string) string {
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if p.GroupsAsSubDomains {
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splitedName := strings.Split(strings.TrimPrefix(name, "/"), "/")
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provider.ReverseStringSlice(&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 (p *Provider) hasCircuitBreakerLabels(application marathon.Application) bool {
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_, ok := p.getLabel(application, "traefik.backend.circuitbreaker.expression")
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return ok
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}
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func (p *Provider) hasLoadBalancerLabels(application marathon.Application) bool {
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_, errMethod := p.getLabel(application, "traefik.backend.loadbalancer.method")
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_, errSticky := p.getLabel(application, "traefik.backend.loadbalancer.sticky")
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return errMethod || errSticky
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}
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func (p *Provider) hasMaxConnLabels(application marathon.Application) bool {
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if _, ok := p.getLabel(application, "traefik.backend.maxconn.amount"); !ok {
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return false
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}
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_, ok := p.getLabel(application, "traefik.backend.maxconn.extractorfunc")
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return ok
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}
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func (p *Provider) getMaxConnAmount(application marathon.Application) int64 {
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if label, ok := p.getLabel(application, "traefik.backend.maxconn.amount"); ok {
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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 (p *Provider) getMaxConnExtractorFunc(application marathon.Application) string {
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if label, ok := p.getLabel(application, "traefik.backend.maxconn.extractorfunc"); ok {
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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 (p *Provider) getLoadBalancerMethod(application marathon.Application) string {
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if label, ok := p.getLabel(application, "traefik.backend.loadbalancer.method"); ok {
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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 (p *Provider) getCircuitBreakerExpression(application marathon.Application) string {
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if label, ok := p.getLabel(application, "traefik.backend.circuitbreaker.expression"); ok {
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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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func (p *Provider) hasHealthCheckLabels(application marathon.Application) bool {
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return p.getHealthCheckPath(application) != ""
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}
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func (p *Provider) getHealthCheckPath(application marathon.Application) string {
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if label, ok := p.getLabel(application, labelBackendHealthCheckPath); ok {
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return label
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}
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return ""
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}
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func (p *Provider) getHealthCheckInterval(application marathon.Application) string {
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if label, ok := p.getLabel(application, labelBackendHealthCheckInterval); ok {
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return label
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}
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return ""
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}
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func (p *Provider) getBasicAuth(application marathon.Application) []string {
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if basicAuth, ok := p.getLabel(application, "traefik.frontend.auth.basic"); ok {
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return strings.Split(basicAuth, ",")
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}
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return []string{}
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}
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func processPorts(application marathon.Application, task marathon.Task) (int, error) {
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if portLabel, ok := (*application.Labels)[labelPort]; ok {
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port, err := strconv.Atoi(portLabel)
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switch {
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case err != nil:
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return 0, fmt.Errorf("failed to parse port label: %s", err)
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case port <= 0:
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return 0, fmt.Errorf("explicitly specified port %d must be larger than zero", port)
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}
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return port, nil
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}
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ports := retrieveAvailablePorts(application, task)
|
|
if len(ports) == 0 {
|
|
return 0, errors.New("no port found")
|
|
}
|
|
|
|
portIndex := 0
|
|
portIndexLabel, ok := (*application.Labels)[labelPortIndex]
|
|
if ok {
|
|
var err error
|
|
portIndex, err = parseIndex(portIndexLabel, len(ports))
|
|
if err != nil {
|
|
return 0, fmt.Errorf("cannot use port index to select from %d ports: %s", len(ports), err)
|
|
}
|
|
}
|
|
return ports[portIndex], nil
|
|
}
|
|
|
|
func retrieveAvailablePorts(application marathon.Application, task marathon.Task) []int {
|
|
// Using default port configuration
|
|
if task.Ports != nil && len(task.Ports) > 0 {
|
|
return task.Ports
|
|
}
|
|
|
|
// Using port definition if available
|
|
if application.PortDefinitions != nil && len(*application.PortDefinitions) > 0 {
|
|
var ports []int
|
|
for _, def := range *application.PortDefinitions {
|
|
if def.Port != nil {
|
|
ports = append(ports, *def.Port)
|
|
}
|
|
}
|
|
return ports
|
|
}
|
|
// If using IP-per-task using this port definition
|
|
if application.IPAddressPerTask != nil && len(*((*application.IPAddressPerTask).Discovery).Ports) > 0 {
|
|
var ports []int
|
|
for _, def := range *((*application.IPAddressPerTask).Discovery).Ports {
|
|
ports = append(ports, def.Number)
|
|
}
|
|
return ports
|
|
}
|
|
|
|
return []int{}
|
|
}
|
|
|
|
func (p *Provider) getBackendServer(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 ""
|
|
}
|
|
|
|
numTaskIPAddresses := len(task.IPAddresses)
|
|
switch {
|
|
case application.IPAddressPerTask == nil || p.ForceTaskHostname:
|
|
return task.Host
|
|
case numTaskIPAddresses == 0:
|
|
log.Errorf("Missing IP address for Marathon application %s on task %s", application.ID, task.ID)
|
|
return ""
|
|
case numTaskIPAddresses == 1:
|
|
return task.IPAddresses[0].IPAddress
|
|
default:
|
|
ipAddressIdxStr, ok := p.getLabel(application, "traefik.ipAddressIdx")
|
|
if !ok {
|
|
log.Errorf("Found %d task IP addresses but missing IP address index for Marathon application %s on task %s", numTaskIPAddresses, application.ID, task.ID)
|
|
return ""
|
|
}
|
|
|
|
ipAddressIdx, err := parseIndex(ipAddressIdxStr, numTaskIPAddresses)
|
|
if err != nil {
|
|
log.Errorf("Cannot use IP address index to select from %d task IP addresses for Marathon application %s on task %s: %s", numTaskIPAddresses, application.ID, task.ID, err)
|
|
return ""
|
|
}
|
|
|
|
return task.IPAddresses[ipAddressIdx].IPAddress
|
|
}
|
|
}
|
|
|
|
func parseIndex(index string, length int) (int, error) {
|
|
parsed, err := strconv.Atoi(index)
|
|
switch {
|
|
case err != nil:
|
|
return 0, fmt.Errorf("failed to parse index '%s': %s", index, err)
|
|
case parsed < 0, parsed > length-1:
|
|
return 0, fmt.Errorf("index %d must be within range (0, %d)", parsed, length-1)
|
|
}
|
|
|
|
return parsed, nil
|
|
}
|