220 lines
8.8 KiB
Go
220 lines
8.8 KiB
Go
package marathon
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import (
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"context"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"text/template"
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"time"
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"github.com/cenkalti/backoff/v3"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
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"github.com/containous/traefik/v2/pkg/job"
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"github.com/containous/traefik/v2/pkg/log"
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"github.com/containous/traefik/v2/pkg/provider"
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"github.com/containous/traefik/v2/pkg/safe"
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"github.com/containous/traefik/v2/pkg/types"
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"github.com/gambol99/go-marathon"
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"github.com/sirupsen/logrus"
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)
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const (
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// DefaultTemplateRule The default template for the default rule.
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DefaultTemplateRule = "Host(`{{ normalize .Name }}`)"
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traceMaxScanTokenSize = 1024 * 1024
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marathonEventIDs = marathon.EventIDApplications |
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marathon.EventIDAddHealthCheck |
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marathon.EventIDDeploymentSuccess |
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marathon.EventIDDeploymentFailed |
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marathon.EventIDDeploymentInfo |
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marathon.EventIDDeploymentStepSuccess |
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marathon.EventIDDeploymentStepFailed
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)
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// TaskState denotes the Mesos state a task can have.
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type TaskState string
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const (
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taskStateRunning TaskState = "TASK_RUNNING"
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taskStateStaging TaskState = "TASK_STAGING"
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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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Constraints string `description:"Constraints is an expression that Traefik matches against the application's labels to determine whether to create any route for that application." json:"constraints,omitempty" toml:"constraints,omitempty" yaml:"constraints,omitempty" export:"true"`
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Trace bool `description:"Display additional provider logs." json:"trace,omitempty" toml:"trace,omitempty" yaml:"trace,omitempty" export:"true"`
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Watch bool `description:"Watch provider." json:"watch,omitempty" toml:"watch,omitempty" yaml:"watch,omitempty" export:"true"`
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Endpoint string `description:"Marathon server endpoint. You can also specify multiple endpoint for Marathon." json:"endpoint,omitempty" toml:"endpoint,omitempty" yaml:"endpoint,omitempty" export:"true"`
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DefaultRule string `description:"Default rule." json:"defaultRule,omitempty" toml:"defaultRule,omitempty" yaml:"defaultRule,omitempty"`
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ExposedByDefault bool `description:"Expose Marathon apps by default." json:"exposedByDefault,omitempty" toml:"exposedByDefault,omitempty" yaml:"exposedByDefault,omitempty" export:"true"`
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DCOSToken string `description:"DCOSToken for DCOS environment, This will override the Authorization header." json:"dcosToken,omitempty" toml:"dcosToken,omitempty" yaml:"dcosToken,omitempty" export:"true"`
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TLS *types.ClientTLS `description:"Enable TLS support." json:"tls,omitempty" toml:"tls,omitempty" yaml:"tls,omitempty" export:"true"`
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DialerTimeout types.Duration `description:"Set a dialer timeout for Marathon." json:"dialerTimeout,omitempty" toml:"dialerTimeout,omitempty" yaml:"dialerTimeout,omitempty" export:"true"`
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ResponseHeaderTimeout types.Duration `description:"Set a response header timeout for Marathon." json:"responseHeaderTimeout,omitempty" toml:"responseHeaderTimeout,omitempty" yaml:"responseHeaderTimeout,omitempty" export:"true"`
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TLSHandshakeTimeout types.Duration `description:"Set a TLS handshake timeout for Marathon." json:"tlsHandshakeTimeout,omitempty" toml:"tlsHandshakeTimeout,omitempty" yaml:"tlsHandshakeTimeout,omitempty" export:"true"`
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KeepAlive types.Duration `description:"Set a TCP Keep Alive time." json:"keepAlive,omitempty" toml:"keepAlive,omitempty" yaml:"keepAlive,omitempty" export:"true"`
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ForceTaskHostname bool `description:"Force to use the task's hostname." json:"forceTaskHostname,omitempty" toml:"forceTaskHostname,omitempty" yaml:"forceTaskHostname,omitempty" export:"true"`
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Basic *Basic `description:"Enable basic authentication." json:"basic,omitempty" toml:"basic,omitempty" yaml:"basic,omitempty" export:"true"`
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RespectReadinessChecks bool `description:"Filter out tasks with non-successful readiness checks during deployments." json:"respectReadinessChecks,omitempty" toml:"respectReadinessChecks,omitempty" yaml:"respectReadinessChecks,omitempty" export:"true"`
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readyChecker *readinessChecker
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marathonClient marathon.Marathon
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defaultRuleTpl *template.Template
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}
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// SetDefaults sets the default values.
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func (p *Provider) SetDefaults() {
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p.Watch = true
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p.Endpoint = "http://127.0.0.1:8080"
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p.ExposedByDefault = true
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p.DialerTimeout = types.Duration(5 * time.Second)
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p.ResponseHeaderTimeout = types.Duration(60 * time.Second)
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p.TLSHandshakeTimeout = types.Duration(5 * time.Second)
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p.KeepAlive = types.Duration(10 * time.Second)
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p.DefaultRule = DefaultTemplateRule
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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." json:"httpBasicAuthUser,omitempty" toml:"httpBasicAuthUser,omitempty" yaml:"httpBasicAuthUser,omitempty"`
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HTTPBasicPassword string `description:"Basic authentication Password." json:"httpBasicPassword,omitempty" toml:"httpBasicPassword,omitempty" yaml:"httpBasicPassword,omitempty"`
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}
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// Init the provider
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func (p *Provider) Init() error {
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fm := template.FuncMap{
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"strsToItfs": func(values []string) []interface{} {
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var r []interface{}
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for _, v := range values {
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r = append(r, v)
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}
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return r
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},
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}
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defaultRuleTpl, err := provider.MakeDefaultRuleTemplate(p.DefaultRule, fm)
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if err != nil {
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return fmt.Errorf("error while parsing default rule: %v", err)
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}
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p.defaultRuleTpl = defaultRuleTpl
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return nil
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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<- dynamic.Message, pool *safe.Pool) error {
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ctx := log.With(context.Background(), log.Str(log.ProviderName, "marathon"))
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logger := log.FromContext(ctx)
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operation := func() error {
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confg := marathon.NewDefaultConfig()
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confg.URL = p.Endpoint
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confg.EventsTransport = marathon.EventsTransportSSE
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if p.Trace {
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confg.LogOutput = log.CustomWriterLevel(logrus.DebugLevel, traceMaxScanTokenSize)
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}
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if p.Basic != nil {
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confg.HTTPBasicAuthUser = p.Basic.HTTPBasicAuthUser
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confg.HTTPBasicPassword = p.Basic.HTTPBasicPassword
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}
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var rc *readinessChecker
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if p.RespectReadinessChecks {
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logger.Debug("Enabling Marathon readiness checker")
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rc = defaultReadinessChecker(p.Trace)
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}
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p.readyChecker = rc
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if len(p.DCOSToken) > 0 {
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confg.DCOSToken = p.DCOSToken
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}
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TLSConfig, err := p.TLS.CreateTLSConfig(ctx)
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if err != nil {
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return err
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}
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confg.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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ResponseHeaderTimeout: time.Duration(p.ResponseHeaderTimeout),
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TLSHandshakeTimeout: time.Duration(p.TLSHandshakeTimeout),
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TLSClientConfig: TLSConfig,
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},
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}
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client, err := marathon.NewClient(confg)
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if err != nil {
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logger.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(marathonEventIDs)
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if err != nil {
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logger.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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logger.Debugf("Received provider event %s", event)
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conf := p.getConfigurations(ctx)
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if conf != nil {
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configurationChan <- dynamic.Message{
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ProviderName: "marathon",
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Configuration: conf,
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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.getConfigurations(ctx)
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configurationChan <- dynamic.Message{
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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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logger.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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logger.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) getConfigurations(ctx context.Context) *dynamic.Configuration {
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applications, err := p.getApplications()
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if err != nil {
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log.FromContext(ctx).Errorf("Failed to retrieve Marathon applications: %v", err)
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return nil
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}
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return p.buildConfiguration(ctx, applications)
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}
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func (p *Provider) getApplications() (*marathon.Applications, error) {
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v := url.Values{}
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v.Add("embed", "apps.tasks")
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v.Add("embed", "apps.deployments")
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v.Add("embed", "apps.readiness")
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return p.marathonClient.Applications(v)
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}
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