package gateway import ( "context" "errors" "fmt" "os" "time" "github.com/traefik/traefik/v2/pkg/log" corev1 "k8s.io/api/core/v1" kubeerror "k8s.io/apimachinery/pkg/api/errors" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/labels" "k8s.io/client-go/informers" "k8s.io/client-go/kubernetes" "k8s.io/client-go/rest" "k8s.io/client-go/tools/clientcmd" "sigs.k8s.io/gateway-api/apis/v1alpha1" "sigs.k8s.io/gateway-api/pkg/client/clientset/versioned" "sigs.k8s.io/gateway-api/pkg/client/informers/externalversions" ) const resyncPeriod = 10 * time.Minute type resourceEventHandler struct { ev chan<- interface{} } func (reh *resourceEventHandler) OnAdd(obj interface{}) { eventHandlerFunc(reh.ev, obj) } func (reh *resourceEventHandler) OnUpdate(oldObj, newObj interface{}) { switch oldObj.(type) { case *v1alpha1.GatewayClass: // Skip update for gateway classes. We only manage addition or deletion for this cluster-wide resource. return default: eventHandlerFunc(reh.ev, newObj) } } func (reh *resourceEventHandler) OnDelete(obj interface{}) { eventHandlerFunc(reh.ev, obj) } // 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) GetGatewayClasses() ([]*v1alpha1.GatewayClass, error) UpdateGatewayStatus(gateway *v1alpha1.Gateway, gatewayStatus v1alpha1.GatewayStatus) error UpdateGatewayClassStatus(gatewayClass *v1alpha1.GatewayClass, condition metav1.Condition) error GetGateways() []*v1alpha1.Gateway GetHTTPRoutes(namespace string, selector labels.Selector) ([]*v1alpha1.HTTPRoute, error) GetService(namespace, name string) (*corev1.Service, bool, error) GetSecret(namespace, name string) (*corev1.Secret, bool, error) GetEndpoints(namespace, name string) (*corev1.Endpoints, bool, error) } type clientWrapper struct { csGateway versioned.Interface csKube kubernetes.Interface factoryGatewayClass externalversions.SharedInformerFactory factoriesGateway map[string]externalversions.SharedInformerFactory factoriesKube map[string]informers.SharedInformerFactory factoriesSecret map[string]informers.SharedInformerFactory isNamespaceAll bool watchedNamespaces []string labelSelector string } func createClientFromConfig(c *rest.Config) (*clientWrapper, error) { csGateway, err := versioned.NewForConfig(c) if err != nil { return nil, err } csKube, err := kubernetes.NewForConfig(c) if err != nil { return nil, err } return newClientImpl(csKube, csGateway), nil } func newClientImpl(csKube kubernetes.Interface, csGateway versioned.Interface) *clientWrapper { return &clientWrapper{ csGateway: csGateway, csKube: csKube, factoriesGateway: make(map[string]externalversions.SharedInformerFactory), factoriesKube: make(map[string]informers.SharedInformerFactory), factoriesSecret: make(map[string]informers.SharedInformerFactory), } } // 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, token, caFilePath string) (*clientWrapper, error) { if endpoint == "" { return nil, errors.New("endpoint missing for external cluster client") } config := &rest.Config{ Host: endpoint, BearerToken: token, } 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) } // WatchAll starts namespace-specific controllers for all relevant kinds. func (c *clientWrapper) WatchAll(namespaces []string, stopCh <-chan struct{}) (<-chan interface{}, error) { eventCh := make(chan interface{}, 1) eventHandler := &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" } labelSelectorOptions := func(options *metav1.ListOptions) { options.LabelSelector = c.labelSelector } c.factoryGatewayClass = externalversions.NewSharedInformerFactoryWithOptions(c.csGateway, resyncPeriod, externalversions.WithTweakListOptions(labelSelectorOptions)) c.factoryGatewayClass.Networking().V1alpha1().GatewayClasses().Informer().AddEventHandler(eventHandler) for _, ns := range namespaces { factoryGateway := externalversions.NewSharedInformerFactoryWithOptions(c.csGateway, resyncPeriod, externalversions.WithNamespace(ns)) factoryGateway.Networking().V1alpha1().Gateways().Informer().AddEventHandler(eventHandler) factoryGateway.Networking().V1alpha1().HTTPRoutes().Informer().AddEventHandler(eventHandler) factoryKube := informers.NewSharedInformerFactoryWithOptions(c.csKube, resyncPeriod, informers.WithNamespace(ns)) factoryKube.Core().V1().Services().Informer().AddEventHandler(eventHandler) factoryKube.Core().V1().Endpoints().Informer().AddEventHandler(eventHandler) factorySecret := informers.NewSharedInformerFactoryWithOptions(c.csKube, resyncPeriod, informers.WithNamespace(ns), informers.WithTweakListOptions(notOwnedByHelm)) factorySecret.Core().V1().Secrets().Informer().AddEventHandler(eventHandler) c.factoriesGateway[ns] = factoryGateway c.factoriesKube[ns] = factoryKube c.factoriesSecret[ns] = factorySecret } c.factoryGatewayClass.Start(stopCh) for _, ns := range namespaces { c.factoriesGateway[ns].Start(stopCh) c.factoriesKube[ns].Start(stopCh) c.factoriesSecret[ns].Start(stopCh) } for t, ok := range c.factoryGatewayClass.WaitForCacheSync(stopCh) { if !ok { return nil, fmt.Errorf("timed out waiting for controller caches to sync %s", t.String()) } } for _, ns := range namespaces { for t, ok := range c.factoriesGateway[ns].WaitForCacheSync(stopCh) { if !ok { return nil, fmt.Errorf("timed out waiting for controller caches to sync %s in namespace %q", t.String(), ns) } } for t, 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", t.String(), ns) } } for t, 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", t.String(), ns) } } } return eventCh, nil } func (c *clientWrapper) GetHTTPRoutes(namespace string, selector labels.Selector) ([]*v1alpha1.HTTPRoute, error) { if !c.isWatchedNamespace(namespace) { return nil, fmt.Errorf("failed to get HTTPRoute %s with labels selector %s: namespace is not within watched namespaces", namespace, selector) } httpRoutes, err := c.factoriesGateway[c.lookupNamespace(namespace)].Networking().V1alpha1().HTTPRoutes().Lister().HTTPRoutes(namespace).List(selector) if err != nil { return nil, err } if len(httpRoutes) == 0 { log.WithoutContext().Debugf("No HTTPRoute found in %q namespace with labels selector %s", namespace, selector) } return httpRoutes, nil } func (c *clientWrapper) GetGateways() []*v1alpha1.Gateway { var result []*v1alpha1.Gateway for ns, factory := range c.factoriesGateway { gateways, err := factory.Networking().V1alpha1().Gateways().Lister().List(labels.Everything()) if err != nil { log.WithoutContext().Errorf("Failed to list Gateways in namespace %s: %v", ns, err) continue } result = append(result, gateways...) } return result } func (c *clientWrapper) GetGatewayClasses() ([]*v1alpha1.GatewayClass, error) { return c.factoryGatewayClass.Networking().V1alpha1().GatewayClasses().Lister().List(labels.Everything()) } func (c *clientWrapper) UpdateGatewayClassStatus(gatewayClass *v1alpha1.GatewayClass, condition metav1.Condition) error { gc := gatewayClass.DeepCopy() var newConditions []metav1.Condition for _, cond := range gc.Status.Conditions { // No update for identical condition. if cond.Type == condition.Type && cond.Status == condition.Status { return nil } // Keep other condition types. if cond.Type != condition.Type { newConditions = append(newConditions, cond) } } // Append the condition to update. newConditions = append(newConditions, condition) gc.Status.Conditions = newConditions ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) defer cancel() _, err := c.csGateway.NetworkingV1alpha1().GatewayClasses().UpdateStatus(ctx, gc, metav1.UpdateOptions{}) if err != nil { return fmt.Errorf("failed to update GatewayClass %q status: %w", gatewayClass.Name, err) } return nil } func (c *clientWrapper) UpdateGatewayStatus(gateway *v1alpha1.Gateway, gatewayStatus v1alpha1.GatewayStatus) error { if !c.isWatchedNamespace(gateway.Namespace) { return fmt.Errorf("cannot update Gateway status %s/%s: namespace is not within watched namespaces", gateway.Namespace, gateway.Name) } if statusEquals(gateway.Status, gatewayStatus) { return nil } g := gateway.DeepCopy() g.Status = gatewayStatus ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) defer cancel() _, err := c.csGateway.NetworkingV1alpha1().Gateways(gateway.Namespace).UpdateStatus(ctx, g, metav1.UpdateOptions{}) if err != nil { return fmt.Errorf("failed to update Gateway %q status: %w", gateway.Name, err) } return nil } func statusEquals(oldStatus, newStatus v1alpha1.GatewayStatus) bool { if len(oldStatus.Listeners) != len(newStatus.Listeners) { return false } if !conditionsEquals(oldStatus.Conditions, newStatus.Conditions) { return false } listenerMatches := 0 for _, newListener := range newStatus.Listeners { for _, oldListener := range oldStatus.Listeners { if newListener.Port == oldListener.Port { if !conditionsEquals(newListener.Conditions, oldListener.Conditions) { return false } listenerMatches++ } } } return listenerMatches == len(oldStatus.Listeners) } func conditionsEquals(conditionsA, conditionsB []metav1.Condition) bool { if len(conditionsA) != len(conditionsB) { return false } conditionMatches := 0 for _, conditionA := range conditionsA { for _, conditionB := range conditionsB { if conditionA.Type == conditionB.Type { if conditionA.Reason != conditionB.Reason || conditionA.Status != conditionB.Status || conditionA.Message != conditionB.Message { return false } conditionMatches++ } } } return conditionMatches == len(conditionsA) } // 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 } // 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 } // eventHandlerFunc will pass the obj on to the events channel or drop it. // This is so passing the events along won't block in the case of high volume. // The events are only used for signaling anyway so dropping a few is ok. func eventHandlerFunc(events chan<- interface{}, obj interface{}) { select { case events <- obj: default: } } // 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 kubeerror.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 }