Co-authored-by: Tom Moulard <tom.moulard@traefik.io> Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com>
684 lines
22 KiB
Go
684 lines
22 KiB
Go
package ingress
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import (
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"context"
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"crypto/sha256"
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"errors"
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"fmt"
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"math"
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"net"
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"os"
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"sort"
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"strconv"
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"strings"
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"time"
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"github.com/cenkalti/backoff/v4"
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"github.com/mitchellh/hashstructure"
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ptypes "github.com/traefik/paerser/types"
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"github.com/traefik/traefik/v2/pkg/config/dynamic"
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"github.com/traefik/traefik/v2/pkg/job"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/provider"
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"github.com/traefik/traefik/v2/pkg/safe"
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"github.com/traefik/traefik/v2/pkg/tls"
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corev1 "k8s.io/api/core/v1"
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networkingv1 "k8s.io/api/networking/v1"
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"k8s.io/apimachinery/pkg/labels"
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)
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const (
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annotationKubernetesIngressClass = "kubernetes.io/ingress.class"
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traefikDefaultIngressClass = "traefik"
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traefikDefaultIngressClassController = "traefik.io/ingress-controller"
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defaultPathMatcher = "PathPrefix"
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)
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// Provider holds configurations of the provider.
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type Provider struct {
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Endpoint string `description:"Kubernetes server endpoint (required for external cluster client)." json:"endpoint,omitempty" toml:"endpoint,omitempty" yaml:"endpoint,omitempty"`
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Token string `description:"Kubernetes bearer token (not needed for in-cluster client)." json:"token,omitempty" toml:"token,omitempty" yaml:"token,omitempty" loggable:"false"`
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CertAuthFilePath string `description:"Kubernetes certificate authority file path (not needed for in-cluster client)." json:"certAuthFilePath,omitempty" toml:"certAuthFilePath,omitempty" yaml:"certAuthFilePath,omitempty"`
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Namespaces []string `description:"Kubernetes namespaces." json:"namespaces,omitempty" toml:"namespaces,omitempty" yaml:"namespaces,omitempty" export:"true"`
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LabelSelector string `description:"Kubernetes Ingress label selector to use." json:"labelSelector,omitempty" toml:"labelSelector,omitempty" yaml:"labelSelector,omitempty" export:"true"`
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IngressClass string `description:"Value of kubernetes.io/ingress.class annotation or IngressClass name to watch for." json:"ingressClass,omitempty" toml:"ingressClass,omitempty" yaml:"ingressClass,omitempty" export:"true"`
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IngressEndpoint *EndpointIngress `description:"Kubernetes Ingress Endpoint." json:"ingressEndpoint,omitempty" toml:"ingressEndpoint,omitempty" yaml:"ingressEndpoint,omitempty" export:"true"`
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ThrottleDuration ptypes.Duration `description:"Ingress refresh throttle duration" json:"throttleDuration,omitempty" toml:"throttleDuration,omitempty" yaml:"throttleDuration,omitempty" export:"true"`
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AllowEmptyServices bool `description:"Allow creation of services without endpoints." json:"allowEmptyServices,omitempty" toml:"allowEmptyServices,omitempty" yaml:"allowEmptyServices,omitempty" export:"true"`
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AllowExternalNameServices bool `description:"Allow ExternalName services." json:"allowExternalNameServices,omitempty" toml:"allowExternalNameServices,omitempty" yaml:"allowExternalNameServices,omitempty" export:"true"`
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lastConfiguration safe.Safe
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}
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// EndpointIngress holds the endpoint information for the Kubernetes provider.
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type EndpointIngress struct {
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IP string `description:"IP used for Kubernetes Ingress endpoints." json:"ip,omitempty" toml:"ip,omitempty" yaml:"ip,omitempty"`
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Hostname string `description:"Hostname used for Kubernetes Ingress endpoints." json:"hostname,omitempty" toml:"hostname,omitempty" yaml:"hostname,omitempty"`
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PublishedService string `description:"Published Kubernetes Service to copy status from." json:"publishedService,omitempty" toml:"publishedService,omitempty" yaml:"publishedService,omitempty"`
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}
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func (p *Provider) newK8sClient(ctx context.Context) (*clientWrapper, error) {
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_, err := labels.Parse(p.LabelSelector)
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if err != nil {
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return nil, fmt.Errorf("invalid ingress label selector: %q", p.LabelSelector)
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}
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logger := log.FromContext(ctx)
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logger.Infof("ingress label selector is: %q", p.LabelSelector)
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withEndpoint := ""
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if p.Endpoint != "" {
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withEndpoint = fmt.Sprintf(" with endpoint %v", p.Endpoint)
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}
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var cl *clientWrapper
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switch {
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case os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "":
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logger.Infof("Creating in-cluster Provider client%s", withEndpoint)
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cl, err = newInClusterClient(p.Endpoint)
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case os.Getenv("KUBECONFIG") != "":
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logger.Infof("Creating cluster-external Provider client from KUBECONFIG %s", os.Getenv("KUBECONFIG"))
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cl, err = newExternalClusterClientFromFile(os.Getenv("KUBECONFIG"))
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default:
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logger.Infof("Creating cluster-external Provider client%s", withEndpoint)
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cl, err = newExternalClusterClient(p.Endpoint, p.Token, p.CertAuthFilePath)
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}
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if err != nil {
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return nil, err
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}
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cl.ingressLabelSelector = p.LabelSelector
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return cl, nil
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}
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// Init the provider.
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func (p *Provider) Init() error {
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return nil
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}
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// Provide allows the k8s 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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ctxLog := log.With(context.Background(), log.Str(log.ProviderName, "kubernetes"))
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logger := log.FromContext(ctxLog)
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k8sClient, err := p.newK8sClient(ctxLog)
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if err != nil {
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return err
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}
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if p.AllowExternalNameServices {
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logger.Warn("ExternalName service loading is enabled, please ensure that this is expected (see AllowExternalNameServices option)")
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}
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pool.GoCtx(func(ctxPool context.Context) {
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operation := func() error {
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eventsChan, err := k8sClient.WatchAll(p.Namespaces, ctxPool.Done())
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if err != nil {
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logger.Errorf("Error watching kubernetes events: %v", err)
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timer := time.NewTimer(1 * time.Second)
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select {
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case <-timer.C:
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return err
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case <-ctxPool.Done():
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return nil
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}
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}
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throttleDuration := time.Duration(p.ThrottleDuration)
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throttledChan := throttleEvents(ctxLog, throttleDuration, pool, eventsChan)
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if throttledChan != nil {
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eventsChan = throttledChan
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}
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for {
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select {
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case <-ctxPool.Done():
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return nil
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case event := <-eventsChan:
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// Note that event is the *first* event that came in during this
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// throttling interval -- if we're hitting our throttle, we may have
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// dropped events. This is fine, because we don't treat different
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// event types differently. But if we do in the future, we'll need to
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// track more information about the dropped events.
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conf := p.loadConfigurationFromIngresses(ctxLog, k8sClient)
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confHash, err := hashstructure.Hash(conf, nil)
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switch {
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case err != nil:
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logger.Error("Unable to hash the configuration")
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case p.lastConfiguration.Get() == confHash:
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logger.Debugf("Skipping Kubernetes event kind %T", event)
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default:
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p.lastConfiguration.Set(confHash)
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configurationChan <- dynamic.Message{
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ProviderName: "kubernetes",
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Configuration: conf,
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}
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}
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// If we're throttling, we sleep here for the throttle duration to
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// enforce that we don't refresh faster than our throttle. time.Sleep
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// returns immediately if p.ThrottleDuration is 0 (no throttle).
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time.Sleep(throttleDuration)
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}
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}
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}
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notify := func(err error, time time.Duration) {
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logger.Errorf("Provider connection error: %s; retrying in %s", err, time)
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}
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), backoff.WithContext(job.NewBackOff(backoff.NewExponentialBackOff()), ctxPool), notify)
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if err != nil {
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logger.Errorf("Cannot connect to Provider: %s", err)
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}
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})
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return nil
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}
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func (p *Provider) loadConfigurationFromIngresses(ctx context.Context, client Client) *dynamic.Configuration {
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conf := &dynamic.Configuration{
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HTTP: &dynamic.HTTPConfiguration{
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Routers: map[string]*dynamic.Router{},
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Middlewares: map[string]*dynamic.Middleware{},
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Services: map[string]*dynamic.Service{},
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},
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TCP: &dynamic.TCPConfiguration{},
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}
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serverVersion := client.GetServerVersion()
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var ingressClasses []*networkingv1.IngressClass
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if supportsIngressClass(serverVersion) {
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ics, err := client.GetIngressClasses()
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if err != nil {
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log.FromContext(ctx).Warnf("Failed to list ingress classes: %v", err)
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}
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if p.IngressClass != "" {
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ingressClasses = filterIngressClassByName(p.IngressClass, ics)
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} else {
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ingressClasses = ics
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}
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}
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ingresses := client.GetIngresses()
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certConfigs := make(map[string]*tls.CertAndStores)
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for _, ingress := range ingresses {
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ctx = log.With(ctx, log.Str("ingress", ingress.Name), log.Str("namespace", ingress.Namespace))
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if !p.shouldProcessIngress(ingress, ingressClasses) {
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continue
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}
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rtConfig, err := parseRouterConfig(ingress.Annotations)
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if err != nil {
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log.FromContext(ctx).Errorf("Failed to parse annotations: %v", err)
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continue
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}
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err = getCertificates(ctx, ingress, client, certConfigs)
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if err != nil {
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log.FromContext(ctx).Errorf("Error configuring TLS: %v", err)
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}
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if len(ingress.Spec.Rules) == 0 && ingress.Spec.DefaultBackend != nil {
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if _, ok := conf.HTTP.Services["default-backend"]; ok {
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log.FromContext(ctx).Error("The default backend already exists.")
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continue
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}
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service, err := p.loadService(client, ingress.Namespace, *ingress.Spec.DefaultBackend)
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if err != nil {
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log.FromContext(ctx).
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WithField("serviceName", ingress.Spec.DefaultBackend.Service.Name).
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WithField("servicePort", ingress.Spec.DefaultBackend.Service.Port.String()).
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Errorf("Cannot create service: %v", err)
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continue
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}
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if len(service.LoadBalancer.Servers) == 0 && !p.AllowEmptyServices {
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log.FromContext(ctx).
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WithField("serviceName", ingress.Spec.DefaultBackend.Service.Name).
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WithField("servicePort", ingress.Spec.DefaultBackend.Service.Port.String()).
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Errorf("Skipping service: no endpoints found")
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continue
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}
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rt := &dynamic.Router{
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Rule: "PathPrefix(`/`)",
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Priority: math.MinInt32,
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Service: "default-backend",
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}
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if rtConfig != nil && rtConfig.Router != nil {
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rt.EntryPoints = rtConfig.Router.EntryPoints
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rt.Middlewares = rtConfig.Router.Middlewares
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rt.TLS = rtConfig.Router.TLS
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}
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conf.HTTP.Routers["default-router"] = rt
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conf.HTTP.Services["default-backend"] = service
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}
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routers := map[string][]*dynamic.Router{}
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for _, rule := range ingress.Spec.Rules {
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if err := p.updateIngressStatus(ingress, client); err != nil {
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log.FromContext(ctx).Errorf("Error while updating ingress status: %v", err)
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}
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if rule.HTTP == nil {
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continue
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}
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for _, pa := range rule.HTTP.Paths {
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service, err := p.loadService(client, ingress.Namespace, pa.Backend)
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if err != nil {
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log.FromContext(ctx).
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WithField("serviceName", pa.Backend.Service.Name).
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WithField("servicePort", pa.Backend.Service.Port.String()).
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Errorf("Cannot create service: %v", err)
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continue
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}
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if len(service.LoadBalancer.Servers) == 0 && !p.AllowEmptyServices {
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log.FromContext(ctx).
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WithField("serviceName", pa.Backend.Service.Name).
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WithField("servicePort", pa.Backend.Service.Port.String()).
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Errorf("Skipping service: no endpoints found")
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continue
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}
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portString := pa.Backend.Service.Port.Name
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if len(pa.Backend.Service.Port.Name) == 0 {
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portString = fmt.Sprint(pa.Backend.Service.Port.Number)
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}
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serviceName := provider.Normalize(ingress.Namespace + "-" + pa.Backend.Service.Name + "-" + portString)
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conf.HTTP.Services[serviceName] = service
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routerKey := strings.TrimPrefix(provider.Normalize(ingress.Name+"-"+ingress.Namespace+"-"+rule.Host+pa.Path), "-")
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routers[routerKey] = append(routers[routerKey], loadRouter(rule, pa, rtConfig, serviceName))
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}
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}
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for routerKey, conflictingRouters := range routers {
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if len(conflictingRouters) == 1 {
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conf.HTTP.Routers[routerKey] = conflictingRouters[0]
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continue
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}
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log.FromContext(ctx).Debugf("Multiple routers are defined with the same key %q, generating hashes to avoid conflicts", routerKey)
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for _, router := range conflictingRouters {
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key, err := makeRouterKeyWithHash(routerKey, router.Rule)
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if err != nil {
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log.FromContext(ctx).Error(err)
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continue
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}
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conf.HTTP.Routers[key] = router
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}
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}
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}
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certs := getTLSConfig(certConfigs)
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if len(certs) > 0 {
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conf.TLS = &dynamic.TLSConfiguration{
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Certificates: certs,
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}
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}
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return conf
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}
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func (p *Provider) updateIngressStatus(ing *networkingv1.Ingress, k8sClient Client) error {
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// Only process if an EndpointIngress has been configured.
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if p.IngressEndpoint == nil {
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return nil
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}
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if len(p.IngressEndpoint.PublishedService) == 0 {
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if len(p.IngressEndpoint.IP) == 0 && len(p.IngressEndpoint.Hostname) == 0 {
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return errors.New("publishedService or ip or hostname must be defined")
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}
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return k8sClient.UpdateIngressStatus(ing, []corev1.LoadBalancerIngress{{IP: p.IngressEndpoint.IP, Hostname: p.IngressEndpoint.Hostname}})
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}
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serviceInfo := strings.Split(p.IngressEndpoint.PublishedService, "/")
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if len(serviceInfo) != 2 {
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return fmt.Errorf("invalid publishedService format (expected 'namespace/service' format): %s", p.IngressEndpoint.PublishedService)
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}
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serviceNamespace, serviceName := serviceInfo[0], serviceInfo[1]
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service, exists, err := k8sClient.GetService(serviceNamespace, serviceName)
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if err != nil {
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return fmt.Errorf("cannot get service %s, received error: %w", p.IngressEndpoint.PublishedService, err)
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}
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if exists && service.Status.LoadBalancer.Ingress == nil {
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// service exists, but has no Load Balancer status
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log.Debugf("Skipping updating Ingress %s/%s due to service %s having no status set", ing.Namespace, ing.Name, p.IngressEndpoint.PublishedService)
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return nil
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}
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if !exists {
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return fmt.Errorf("missing service: %s", p.IngressEndpoint.PublishedService)
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}
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return k8sClient.UpdateIngressStatus(ing, service.Status.LoadBalancer.Ingress)
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}
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func (p *Provider) shouldProcessIngress(ingress *networkingv1.Ingress, ingressClasses []*networkingv1.IngressClass) bool {
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// configuration through the new kubernetes ingressClass
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if ingress.Spec.IngressClassName != nil {
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for _, ic := range ingressClasses {
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if *ingress.Spec.IngressClassName == ic.ObjectMeta.Name {
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return true
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}
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}
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return false
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}
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return p.IngressClass == ingress.Annotations[annotationKubernetesIngressClass] ||
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len(p.IngressClass) == 0 && ingress.Annotations[annotationKubernetesIngressClass] == traefikDefaultIngressClass
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}
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func buildHostRule(host string) string {
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if strings.HasPrefix(host, "*.") {
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return "HostRegexp(`" + strings.Replace(host, "*.", "{subdomain:[a-zA-Z0-9-]+}.", 1) + "`)"
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}
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return "Host(`" + host + "`)"
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}
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func getCertificates(ctx context.Context, ingress *networkingv1.Ingress, k8sClient Client, tlsConfigs map[string]*tls.CertAndStores) error {
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for _, t := range ingress.Spec.TLS {
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if t.SecretName == "" {
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log.FromContext(ctx).Debugf("Skipping TLS sub-section: No secret name provided")
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continue
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}
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configKey := ingress.Namespace + "-" + t.SecretName
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if _, tlsExists := tlsConfigs[configKey]; !tlsExists {
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secret, exists, err := k8sClient.GetSecret(ingress.Namespace, t.SecretName)
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if err != nil {
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return fmt.Errorf("failed to fetch secret %s/%s: %w", ingress.Namespace, t.SecretName, err)
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}
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if !exists {
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return fmt.Errorf("secret %s/%s does not exist", ingress.Namespace, t.SecretName)
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}
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cert, key, err := getCertificateBlocks(secret, ingress.Namespace, t.SecretName)
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if err != nil {
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return err
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}
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tlsConfigs[configKey] = &tls.CertAndStores{
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Certificate: tls.Certificate{
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CertFile: tls.FileOrContent(cert),
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KeyFile: tls.FileOrContent(key),
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},
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}
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}
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}
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return nil
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}
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func getCertificateBlocks(secret *corev1.Secret, namespace, secretName string) (string, string, error) {
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var missingEntries []string
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tlsCrtData, tlsCrtExists := secret.Data["tls.crt"]
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if !tlsCrtExists {
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missingEntries = append(missingEntries, "tls.crt")
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}
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tlsKeyData, tlsKeyExists := secret.Data["tls.key"]
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if !tlsKeyExists {
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missingEntries = append(missingEntries, "tls.key")
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}
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if len(missingEntries) > 0 {
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return "", "", fmt.Errorf("secret %s/%s is missing the following TLS data entries: %s",
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namespace, secretName, strings.Join(missingEntries, ", "))
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}
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cert := string(tlsCrtData)
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if cert == "" {
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missingEntries = append(missingEntries, "tls.crt")
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}
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key := string(tlsKeyData)
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if key == "" {
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missingEntries = append(missingEntries, "tls.key")
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}
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if len(missingEntries) > 0 {
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return "", "", fmt.Errorf("secret %s/%s contains the following empty TLS data entries: %s",
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namespace, secretName, strings.Join(missingEntries, ", "))
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}
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return cert, key, nil
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}
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func getTLSConfig(tlsConfigs map[string]*tls.CertAndStores) []*tls.CertAndStores {
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var secretNames []string
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for secretName := range tlsConfigs {
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secretNames = append(secretNames, secretName)
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}
|
|
sort.Strings(secretNames)
|
|
|
|
var configs []*tls.CertAndStores
|
|
for _, secretName := range secretNames {
|
|
configs = append(configs, tlsConfigs[secretName])
|
|
}
|
|
|
|
return configs
|
|
}
|
|
|
|
func (p *Provider) loadService(client Client, namespace string, backend networkingv1.IngressBackend) (*dynamic.Service, error) {
|
|
service, exists, err := client.GetService(namespace, backend.Service.Name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if !exists {
|
|
return nil, errors.New("service not found")
|
|
}
|
|
|
|
if !p.AllowExternalNameServices && service.Spec.Type == corev1.ServiceTypeExternalName {
|
|
return nil, fmt.Errorf("externalName services not allowed: %s/%s", namespace, backend.Service.Name)
|
|
}
|
|
|
|
var portName string
|
|
var portSpec corev1.ServicePort
|
|
var match bool
|
|
for _, p := range service.Spec.Ports {
|
|
if backend.Service.Port.Number == p.Port || (backend.Service.Port.Name == p.Name && len(p.Name) > 0) {
|
|
portName = p.Name
|
|
portSpec = p
|
|
match = true
|
|
break
|
|
}
|
|
}
|
|
|
|
if !match {
|
|
return nil, errors.New("service port not found")
|
|
}
|
|
|
|
svc := &dynamic.Service{
|
|
LoadBalancer: &dynamic.ServersLoadBalancer{
|
|
PassHostHeader: func(v bool) *bool { return &v }(true),
|
|
},
|
|
}
|
|
|
|
svcConfig, err := parseServiceConfig(service.Annotations)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if svcConfig != nil && svcConfig.Service != nil {
|
|
svc.LoadBalancer.Sticky = svcConfig.Service.Sticky
|
|
|
|
if svcConfig.Service.PassHostHeader != nil {
|
|
svc.LoadBalancer.PassHostHeader = svcConfig.Service.PassHostHeader
|
|
}
|
|
|
|
if svcConfig.Service.ServersTransport != "" {
|
|
svc.LoadBalancer.ServersTransport = svcConfig.Service.ServersTransport
|
|
}
|
|
}
|
|
|
|
if service.Spec.Type == corev1.ServiceTypeExternalName {
|
|
protocol := getProtocol(portSpec, portSpec.Name, svcConfig)
|
|
hostPort := net.JoinHostPort(service.Spec.ExternalName, strconv.Itoa(int(portSpec.Port)))
|
|
|
|
svc.LoadBalancer.Servers = []dynamic.Server{
|
|
{URL: fmt.Sprintf("%s://%s", protocol, hostPort)},
|
|
}
|
|
|
|
return svc, nil
|
|
}
|
|
|
|
endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, backend.Service.Name)
|
|
if endpointsErr != nil {
|
|
return nil, endpointsErr
|
|
}
|
|
|
|
if !endpointsExists {
|
|
return nil, errors.New("endpoints not found")
|
|
}
|
|
|
|
for _, subset := range endpoints.Subsets {
|
|
var port int32
|
|
for _, p := range subset.Ports {
|
|
if portName == p.Name {
|
|
port = p.Port
|
|
break
|
|
}
|
|
}
|
|
|
|
if port == 0 {
|
|
continue
|
|
}
|
|
|
|
protocol := getProtocol(portSpec, portName, svcConfig)
|
|
|
|
for _, addr := range subset.Addresses {
|
|
hostPort := net.JoinHostPort(addr.IP, strconv.Itoa(int(port)))
|
|
|
|
svc.LoadBalancer.Servers = append(svc.LoadBalancer.Servers, dynamic.Server{
|
|
URL: fmt.Sprintf("%s://%s", protocol, hostPort),
|
|
})
|
|
}
|
|
}
|
|
|
|
return svc, nil
|
|
}
|
|
|
|
func getProtocol(portSpec corev1.ServicePort, portName string, svcConfig *ServiceConfig) string {
|
|
if svcConfig != nil && svcConfig.Service != nil && svcConfig.Service.ServersScheme != "" {
|
|
return svcConfig.Service.ServersScheme
|
|
}
|
|
|
|
protocol := "http"
|
|
if portSpec.Port == 443 || strings.HasPrefix(portName, "https") {
|
|
protocol = "https"
|
|
}
|
|
|
|
return protocol
|
|
}
|
|
|
|
func makeRouterKeyWithHash(key, rule string) (string, error) {
|
|
h := sha256.New()
|
|
if _, err := h.Write([]byte(rule)); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
dupKey := fmt.Sprintf("%s-%.10x", key, h.Sum(nil))
|
|
|
|
return dupKey, nil
|
|
}
|
|
|
|
func loadRouter(rule networkingv1.IngressRule, pa networkingv1.HTTPIngressPath, rtConfig *RouterConfig, serviceName string) *dynamic.Router {
|
|
var rules []string
|
|
if len(rule.Host) > 0 {
|
|
rules = []string{buildHostRule(rule.Host)}
|
|
}
|
|
|
|
if len(pa.Path) > 0 {
|
|
matcher := defaultPathMatcher
|
|
|
|
if pa.PathType == nil || *pa.PathType == "" || *pa.PathType == networkingv1.PathTypeImplementationSpecific {
|
|
if rtConfig != nil && rtConfig.Router != nil && rtConfig.Router.PathMatcher != "" {
|
|
matcher = rtConfig.Router.PathMatcher
|
|
}
|
|
} else if *pa.PathType == networkingv1.PathTypeExact {
|
|
matcher = "Path"
|
|
}
|
|
|
|
rules = append(rules, fmt.Sprintf("%s(`%s`)", matcher, pa.Path))
|
|
}
|
|
|
|
rt := &dynamic.Router{
|
|
Rule: strings.Join(rules, " && "),
|
|
Service: serviceName,
|
|
}
|
|
|
|
if rtConfig != nil && rtConfig.Router != nil {
|
|
rt.Priority = rtConfig.Router.Priority
|
|
rt.EntryPoints = rtConfig.Router.EntryPoints
|
|
rt.Middlewares = rtConfig.Router.Middlewares
|
|
|
|
if rtConfig.Router.TLS != nil {
|
|
rt.TLS = rtConfig.Router.TLS
|
|
}
|
|
}
|
|
|
|
return rt
|
|
}
|
|
|
|
func throttleEvents(ctx context.Context, throttleDuration time.Duration, pool *safe.Pool, eventsChan <-chan interface{}) chan interface{} {
|
|
if throttleDuration == 0 {
|
|
return nil
|
|
}
|
|
|
|
// Create a buffered channel to hold the pending event (if we're delaying processing the event due to throttling).
|
|
eventsChanBuffered := make(chan interface{}, 1)
|
|
|
|
// Run a goroutine that reads events from eventChan and does a
|
|
// non-blocking write to pendingEvent. This guarantees that writing to
|
|
// eventChan will never block, and that pendingEvent will have
|
|
// something in it if there's been an event since we read from that channel.
|
|
pool.GoCtx(func(ctxPool context.Context) {
|
|
for {
|
|
select {
|
|
case <-ctxPool.Done():
|
|
return
|
|
case nextEvent := <-eventsChan:
|
|
select {
|
|
case eventsChanBuffered <- nextEvent:
|
|
default:
|
|
// We already have an event in eventsChanBuffered, so we'll
|
|
// do a refresh as soon as our throttle allows us to. It's fine
|
|
// to drop the event and keep whatever's in the buffer -- we
|
|
// don't do different things for different events.
|
|
log.FromContext(ctx).Debugf("Dropping event kind %T due to throttling", nextEvent)
|
|
}
|
|
}
|
|
}
|
|
})
|
|
|
|
return eventsChanBuffered
|
|
}
|