package ingress import ( "context" "errors" "fmt" "os" "path/filepath" "runtime" "time" "github.com/hashicorp/go-version" "github.com/rs/zerolog/log" "github.com/traefik/traefik/v3/pkg/provider/kubernetes/k8s" "github.com/traefik/traefik/v3/pkg/types" traefikversion "github.com/traefik/traefik/v3/pkg/version" corev1 "k8s.io/api/core/v1" netv1 "k8s.io/api/networking/v1" kerror "k8s.io/apimachinery/pkg/api/errors" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/labels" kinformers "k8s.io/client-go/informers" kclientset "k8s.io/client-go/kubernetes" "k8s.io/client-go/rest" "k8s.io/client-go/tools/clientcmd" ) const ( resyncPeriod = 10 * time.Minute defaultTimeout = 5 * time.Second ) // Client is a client for the Provider master. // WatchAll starts the watch of the Provider resources and updates the stores. // The stores can then be accessed via the Get* functions. type Client interface { WatchAll(namespaces []string, stopCh <-chan struct{}) (<-chan interface{}, error) GetIngresses() []*netv1.Ingress GetIngressClasses() ([]*netv1.IngressClass, error) GetService(namespace, name string) (*corev1.Service, bool, error) GetSecret(namespace, name string) (*corev1.Secret, bool, error) GetNodes() ([]*corev1.Node, bool, error) GetEndpoints(namespace, name string) (*corev1.Endpoints, bool, error) UpdateIngressStatus(ing *netv1.Ingress, ingStatus []netv1.IngressLoadBalancerIngress) error } type clientWrapper struct { clientset kclientset.Interface factoryClusterScope kinformers.SharedInformerFactory factoriesKube map[string]kinformers.SharedInformerFactory factoriesSecret map[string]kinformers.SharedInformerFactory factoriesIngress map[string]kinformers.SharedInformerFactory clusterFactory kinformers.SharedInformerFactory ingressLabelSelector string isNamespaceAll bool disableIngressClassInformer bool watchedNamespaces []string serverVersion *version.Version } // newInClusterClient returns a new Provider client that is expected to run // inside the cluster. func newInClusterClient(endpoint string) (*clientWrapper, error) { config, err := rest.InClusterConfig() if err != nil { return nil, fmt.Errorf("failed to create in-cluster configuration: %w", err) } if endpoint != "" { config.Host = endpoint } return createClientFromConfig(config) } func newExternalClusterClientFromFile(file string) (*clientWrapper, error) { configFromFlags, err := clientcmd.BuildConfigFromFlags("", file) if err != nil { return nil, err } return createClientFromConfig(configFromFlags) } // newExternalClusterClient returns a new Provider client that may run outside // of the cluster. // The endpoint parameter must not be empty. func newExternalClusterClient(endpoint, caFilePath string, token types.FileOrContent) (*clientWrapper, error) { if endpoint == "" { return nil, errors.New("endpoint missing for external cluster client") } tokenData, err := token.Read() if err != nil { return nil, fmt.Errorf("read token: %w", err) } config := &rest.Config{ Host: endpoint, BearerToken: string(tokenData), } if caFilePath != "" { caData, err := os.ReadFile(caFilePath) if err != nil { return nil, fmt.Errorf("failed to read CA file %s: %w", caFilePath, err) } config.TLSClientConfig = rest.TLSClientConfig{CAData: caData} } return createClientFromConfig(config) } func createClientFromConfig(c *rest.Config) (*clientWrapper, error) { c.UserAgent = fmt.Sprintf( "%s/%s (%s/%s) kubernetes/ingress", filepath.Base(os.Args[0]), traefikversion.Version, runtime.GOOS, runtime.GOARCH, ) clientset, err := kclientset.NewForConfig(c) if err != nil { return nil, err } return newClientImpl(clientset), nil } func newClientImpl(clientset kclientset.Interface) *clientWrapper { return &clientWrapper{ clientset: clientset, factoriesSecret: make(map[string]kinformers.SharedInformerFactory), factoriesIngress: make(map[string]kinformers.SharedInformerFactory), factoriesKube: make(map[string]kinformers.SharedInformerFactory), } } // WatchAll starts namespace-specific controllers for all relevant kinds. func (c *clientWrapper) WatchAll(namespaces []string, stopCh <-chan struct{}) (<-chan interface{}, error) { // Get and store the serverVersion for future use. serverVersionInfo, err := c.clientset.Discovery().ServerVersion() if err != nil { return nil, fmt.Errorf("could not retrieve server version: %w", err) } serverVersion, err := version.NewVersion(serverVersionInfo.GitVersion) if err != nil { return nil, fmt.Errorf("could not parse server version: %w", err) } c.serverVersion = serverVersion eventCh := make(chan interface{}, 1) eventHandler := &k8s.ResourceEventHandler{Ev: eventCh} if len(namespaces) == 0 { namespaces = []string{metav1.NamespaceAll} c.isNamespaceAll = true } c.watchedNamespaces = namespaces notOwnedByHelm := func(opts *metav1.ListOptions) { opts.LabelSelector = "owner!=helm" } matchesLabelSelector := func(opts *metav1.ListOptions) { opts.LabelSelector = c.ingressLabelSelector } for _, ns := range namespaces { factoryIngress := kinformers.NewSharedInformerFactoryWithOptions(c.clientset, resyncPeriod, kinformers.WithNamespace(ns), kinformers.WithTweakListOptions(matchesLabelSelector)) _, err = factoryIngress.Networking().V1().Ingresses().Informer().AddEventHandler(eventHandler) if err != nil { return nil, err } c.factoriesIngress[ns] = factoryIngress factoryKube := kinformers.NewSharedInformerFactoryWithOptions(c.clientset, resyncPeriod, kinformers.WithNamespace(ns)) _, err = factoryKube.Core().V1().Services().Informer().AddEventHandler(eventHandler) if err != nil { return nil, err } _, err = factoryKube.Core().V1().Endpoints().Informer().AddEventHandler(eventHandler) if err != nil { return nil, err } c.factoriesKube[ns] = factoryKube factorySecret := kinformers.NewSharedInformerFactoryWithOptions(c.clientset, resyncPeriod, kinformers.WithNamespace(ns), kinformers.WithTweakListOptions(notOwnedByHelm)) _, err = factorySecret.Core().V1().Secrets().Informer().AddEventHandler(eventHandler) if err != nil { return nil, err } c.factoriesSecret[ns] = factorySecret } c.factoryClusterScope = kinformers.NewSharedInformerFactory(c.clientset, resyncPeriod) _, err = c.factoryClusterScope.Core().V1().Nodes().Informer().AddEventHandler(eventHandler) if err != nil { return nil, err } for _, ns := range namespaces { c.factoriesIngress[ns].Start(stopCh) c.factoriesKube[ns].Start(stopCh) c.factoriesSecret[ns].Start(stopCh) } c.factoryClusterScope.Start(stopCh) for _, ns := range namespaces { for typ, ok := range c.factoriesIngress[ns].WaitForCacheSync(stopCh) { if !ok { return nil, fmt.Errorf("timed out waiting for controller caches to sync %s in namespace %q", typ, ns) } } for typ, ok := range c.factoriesKube[ns].WaitForCacheSync(stopCh) { if !ok { return nil, fmt.Errorf("timed out waiting for controller caches to sync %s in namespace %q", typ, ns) } } for typ, ok := range c.factoriesSecret[ns].WaitForCacheSync(stopCh) { if !ok { return nil, fmt.Errorf("timed out waiting for controller caches to sync %s in namespace %q", typ, ns) } } } for t, ok := range c.factoryClusterScope.WaitForCacheSync(stopCh) { if !ok { return nil, fmt.Errorf("timed out waiting for controller caches to sync %s", t.String()) } } if !c.disableIngressClassInformer { c.clusterFactory = kinformers.NewSharedInformerFactoryWithOptions(c.clientset, resyncPeriod) _, err = c.clusterFactory.Networking().V1().IngressClasses().Informer().AddEventHandler(eventHandler) if err != nil { return nil, err } c.clusterFactory.Start(stopCh) for typ, ok := range c.clusterFactory.WaitForCacheSync(stopCh) { if !ok { return nil, fmt.Errorf("timed out waiting for controller caches to sync %s", typ) } } } return eventCh, nil } // GetIngresses returns all Ingresses for observed namespaces in the cluster. func (c *clientWrapper) GetIngresses() []*netv1.Ingress { var results []*netv1.Ingress for ns, factory := range c.factoriesIngress { // networking listNew, err := factory.Networking().V1().Ingresses().Lister().List(labels.Everything()) if err != nil { log.Error().Err(err).Msgf("Failed to list ingresses in namespace %s", ns) continue } results = append(results, listNew...) } return results } // UpdateIngressStatus updates an Ingress with a provided status. func (c *clientWrapper) UpdateIngressStatus(src *netv1.Ingress, ingStatus []netv1.IngressLoadBalancerIngress) error { if !c.isWatchedNamespace(src.Namespace) { return fmt.Errorf("failed to get ingress %s/%s: namespace is not within watched namespaces", src.Namespace, src.Name) } ing, err := c.factoriesIngress[c.lookupNamespace(src.Namespace)].Networking().V1().Ingresses().Lister().Ingresses(src.Namespace).Get(src.Name) if err != nil { return fmt.Errorf("failed to get ingress %s/%s: %w", src.Namespace, src.Name, err) } logger := log.With().Str("namespace", ing.Namespace).Str("ingress", ing.Name).Logger() if isLoadBalancerIngressEquals(ing.Status.LoadBalancer.Ingress, ingStatus) { logger.Debug().Msg("Skipping ingress status update") return nil } ingCopy := ing.DeepCopy() ingCopy.Status = netv1.IngressStatus{LoadBalancer: netv1.IngressLoadBalancerStatus{Ingress: ingStatus}} ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout) defer cancel() _, err = c.clientset.NetworkingV1().Ingresses(ingCopy.Namespace).UpdateStatus(ctx, ingCopy, metav1.UpdateOptions{}) if err != nil { return fmt.Errorf("failed to update ingress status %s/%s: %w", src.Namespace, src.Name, err) } logger.Info().Msg("Updated ingress status") return nil } // isLoadBalancerIngressEquals returns true if the given slices are equal, false otherwise. func isLoadBalancerIngressEquals(aSlice, bSlice []netv1.IngressLoadBalancerIngress) bool { if len(aSlice) != len(bSlice) { return false } aMap := make(map[string]struct{}) for _, aIngress := range aSlice { aMap[aIngress.Hostname+aIngress.IP] = struct{}{} } for _, bIngress := range bSlice { if _, exists := aMap[bIngress.Hostname+bIngress.IP]; !exists { return false } } return true } // GetService returns the named service from the given namespace. func (c *clientWrapper) GetService(namespace, name string) (*corev1.Service, bool, error) { if !c.isWatchedNamespace(namespace) { return nil, false, fmt.Errorf("failed to get service %s/%s: namespace is not within watched namespaces", namespace, name) } service, err := c.factoriesKube[c.lookupNamespace(namespace)].Core().V1().Services().Lister().Services(namespace).Get(name) exist, err := translateNotFoundError(err) return service, exist, err } // GetEndpoints returns the named endpoints from the given namespace. func (c *clientWrapper) GetEndpoints(namespace, name string) (*corev1.Endpoints, bool, error) { if !c.isWatchedNamespace(namespace) { return nil, false, fmt.Errorf("failed to get endpoints %s/%s: namespace is not within watched namespaces", namespace, name) } endpoint, err := c.factoriesKube[c.lookupNamespace(namespace)].Core().V1().Endpoints().Lister().Endpoints(namespace).Get(name) exist, err := translateNotFoundError(err) return endpoint, exist, err } // GetSecret returns the named secret from the given namespace. func (c *clientWrapper) GetSecret(namespace, name string) (*corev1.Secret, bool, error) { if !c.isWatchedNamespace(namespace) { return nil, false, fmt.Errorf("failed to get secret %s/%s: namespace is not within watched namespaces", namespace, name) } secret, err := c.factoriesSecret[c.lookupNamespace(namespace)].Core().V1().Secrets().Lister().Secrets(namespace).Get(name) exist, err := translateNotFoundError(err) return secret, exist, err } func (c *clientWrapper) GetNodes() ([]*corev1.Node, bool, error) { nodes, err := c.factoryClusterScope.Core().V1().Nodes().Lister().List(labels.Everything()) exist, err := translateNotFoundError(err) return nodes, exist, err } func (c *clientWrapper) GetIngressClasses() ([]*netv1.IngressClass, error) { if c.clusterFactory == nil { return nil, errors.New("cluster factory not loaded") } var ics []*netv1.IngressClass ingressClasses, err := c.clusterFactory.Networking().V1().IngressClasses().Lister().List(labels.Everything()) if err != nil { return nil, err } for _, ic := range ingressClasses { if ic.Spec.Controller == traefikDefaultIngressClassController { ics = append(ics, ic) } } return ics, nil } // lookupNamespace returns the lookup namespace key for the given namespace. // When listening on all namespaces, it returns the client-go identifier ("") // for all-namespaces. Otherwise, it returns the given namespace. // The distinction is necessary because we index all informers on the special // identifier iff all-namespaces are requested but receive specific namespace // identifiers from the Kubernetes API, so we have to bridge this gap. func (c *clientWrapper) lookupNamespace(ns string) string { if c.isNamespaceAll { return metav1.NamespaceAll } return ns } // translateNotFoundError will translate a "not found" error to a boolean return // value which indicates if the resource exists and a nil error. func translateNotFoundError(err error) (bool, error) { if kerror.IsNotFound(err) { return false, nil } return err == nil, err } // isWatchedNamespace checks to ensure that the namespace is being watched before we request // it to ensure we don't panic by requesting an out-of-watch object. func (c *clientWrapper) isWatchedNamespace(ns string) bool { if c.isNamespaceAll { return true } for _, watchedNamespace := range c.watchedNamespaces { if watchedNamespace == ns { return true } } return false } // filterIngressClassByName return a slice containing ingressclasses with the correct name. func filterIngressClassByName(ingressClassName string, ics []*netv1.IngressClass) []*netv1.IngressClass { var ingressClasses []*netv1.IngressClass for _, ic := range ics { if ic.Name == ingressClassName { ingressClasses = append(ingressClasses, ic) } } return ingressClasses }