package gateway import ( "context" "crypto/sha256" "errors" "fmt" "net" "os" "sort" "strconv" "strings" "time" "github.com/cenkalti/backoff/v4" "github.com/hashicorp/go-multierror" "github.com/mitchellh/hashstructure" "github.com/rs/zerolog/log" ptypes "github.com/traefik/paerser/types" "github.com/traefik/traefik/v2/pkg/config/dynamic" "github.com/traefik/traefik/v2/pkg/job" "github.com/traefik/traefik/v2/pkg/logs" "github.com/traefik/traefik/v2/pkg/provider" traefikv1alpha1 "github.com/traefik/traefik/v2/pkg/provider/kubernetes/crd/traefik/v1alpha1" "github.com/traefik/traefik/v2/pkg/safe" "github.com/traefik/traefik/v2/pkg/tls" corev1 "k8s.io/api/core/v1" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/labels" "k8s.io/utils/pointer" "k8s.io/utils/strings/slices" "sigs.k8s.io/gateway-api/apis/v1alpha2" ) const ( providerName = "kubernetesgateway" kindGateway = "Gateway" kindTraefikService = "TraefikService" kindHTTPRoute = "HTTPRoute" kindTCPRoute = "TCPRoute" kindTLSRoute = "TLSRoute" ) // Provider holds configurations of the provider. type Provider struct { Endpoint string `description:"Kubernetes server endpoint (required for external cluster client)." json:"endpoint,omitempty" toml:"endpoint,omitempty" yaml:"endpoint,omitempty"` Token string `description:"Kubernetes bearer token (not needed for in-cluster client)." json:"token,omitempty" toml:"token,omitempty" yaml:"token,omitempty" loggable:"false"` CertAuthFilePath string `description:"Kubernetes certificate authority file path (not needed for in-cluster client)." json:"certAuthFilePath,omitempty" toml:"certAuthFilePath,omitempty" yaml:"certAuthFilePath,omitempty"` Namespaces []string `description:"Kubernetes namespaces." json:"namespaces,omitempty" toml:"namespaces,omitempty" yaml:"namespaces,omitempty" export:"true"` LabelSelector string `description:"Kubernetes label selector to select specific GatewayClasses." json:"labelSelector,omitempty" toml:"labelSelector,omitempty" yaml:"labelSelector,omitempty" export:"true"` ThrottleDuration ptypes.Duration `description:"Kubernetes refresh throttle duration" json:"throttleDuration,omitempty" toml:"throttleDuration,omitempty" yaml:"throttleDuration,omitempty" export:"true"` EntryPoints map[string]Entrypoint `json:"-" toml:"-" yaml:"-" label:"-" file:"-"` lastConfiguration safe.Safe } // Entrypoint defines the available entry points. type Entrypoint struct { Address string HasHTTPTLSConf bool } func (p *Provider) newK8sClient(ctx context.Context) (*clientWrapper, error) { // Label selector validation _, err := labels.Parse(p.LabelSelector) if err != nil { return nil, fmt.Errorf("invalid label selector: %q", p.LabelSelector) } logger := log.Ctx(ctx) logger.Info().Msgf("Label selector is: %q", p.LabelSelector) var client *clientWrapper switch { case os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "": logger.Info().Str("endpoint", p.Endpoint).Msg("Creating in-cluster Provider client") client, err = newInClusterClient(p.Endpoint) case os.Getenv("KUBECONFIG") != "": logger.Info().Msgf("Creating cluster-external Provider client from KUBECONFIG %s", os.Getenv("KUBECONFIG")) client, err = newExternalClusterClientFromFile(os.Getenv("KUBECONFIG")) default: logger.Info().Str("endpoint", p.Endpoint).Msg("Creating cluster-external Provider client") client, err = newExternalClusterClient(p.Endpoint, p.Token, p.CertAuthFilePath) } if err != nil { return nil, err } client.labelSelector = p.LabelSelector return client, nil } // Init the provider. func (p *Provider) Init() error { return nil } // Provide allows the k8s provider to provide configurations to traefik using the given configuration channel. func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error { logger := log.With().Str(logs.ProviderName, providerName).Logger() ctxLog := logger.WithContext(context.Background()) k8sClient, err := p.newK8sClient(ctxLog) if err != nil { return err } pool.GoCtx(func(ctxPool context.Context) { operation := func() error { eventsChan, err := k8sClient.WatchAll(p.Namespaces, ctxPool.Done()) if err != nil { logger.Error().Err(err).Msg("Error watching kubernetes events") timer := time.NewTimer(1 * time.Second) select { case <-timer.C: return err case <-ctxPool.Done(): return nil } } throttleDuration := time.Duration(p.ThrottleDuration) throttledChan := throttleEvents(ctxLog, throttleDuration, pool, eventsChan) if throttledChan != nil { eventsChan = throttledChan } for { select { case <-ctxPool.Done(): return nil case event := <-eventsChan: // Note that event is the *first* event that came in during this throttling interval -- if we're hitting our throttle, we may have dropped events. // This is fine, because we don't treat different event types differently. // But if we do in the future, we'll need to track more information about the dropped events. conf := p.loadConfigurationFromGateway(ctxLog, k8sClient) confHash, err := hashstructure.Hash(conf, nil) switch { case err != nil: logger.Error().Msg("Unable to hash the configuration") case p.lastConfiguration.Get() == confHash: logger.Debug().Msgf("Skipping Kubernetes event kind %T", event) default: p.lastConfiguration.Set(confHash) configurationChan <- dynamic.Message{ ProviderName: providerName, Configuration: conf, } } // If we're throttling, // we sleep here for the throttle duration to enforce that we don't refresh faster than our throttle. // time.Sleep returns immediately if p.ThrottleDuration is 0 (no throttle). time.Sleep(throttleDuration) } } } notify := func(err error, time time.Duration) { logger.Error().Err(err).Msgf("Provider connection error, retrying in %s", time) } err := backoff.RetryNotify(safe.OperationWithRecover(operation), backoff.WithContext(job.NewBackOff(backoff.NewExponentialBackOff()), ctxPool), notify) if err != nil { logger.Error().Err(err).Msg("Cannot connect to Provider") } }) return nil } // TODO Handle errors and update resources statuses (gatewayClass, gateway). func (p *Provider) loadConfigurationFromGateway(ctx context.Context, client Client) *dynamic.Configuration { logger := log.Ctx(ctx) gatewayClassNames := map[string]struct{}{} gatewayClasses, err := client.GetGatewayClasses() if err != nil { logger.Error().Err(err).Msg("Cannot find GatewayClasses") return &dynamic.Configuration{ UDP: &dynamic.UDPConfiguration{ Routers: map[string]*dynamic.UDPRouter{}, Services: map[string]*dynamic.UDPService{}, }, TCP: &dynamic.TCPConfiguration{ Routers: map[string]*dynamic.TCPRouter{}, Services: map[string]*dynamic.TCPService{}, }, HTTP: &dynamic.HTTPConfiguration{ Routers: map[string]*dynamic.Router{}, Middlewares: map[string]*dynamic.Middleware{}, Services: map[string]*dynamic.Service{}, }, TLS: &dynamic.TLSConfiguration{}, } } for _, gatewayClass := range gatewayClasses { if gatewayClass.Spec.ControllerName == "traefik.io/gateway-controller" { gatewayClassNames[gatewayClass.Name] = struct{}{} err := client.UpdateGatewayClassStatus(gatewayClass, metav1.Condition{ Type: string(v1alpha2.GatewayClassConditionStatusAccepted), Status: metav1.ConditionTrue, Reason: "Handled", Message: "Handled by Traefik controller", LastTransitionTime: metav1.Now(), }) if err != nil { logger.Error().Err(err).Msgf("Failed to update %s condition", v1alpha2.GatewayClassConditionStatusAccepted) } } } cfgs := map[string]*dynamic.Configuration{} // TODO check if we can only use the default filtering mechanism for _, gateway := range client.GetGateways() { logger := log.Ctx(ctx).With().Str("gateway", gateway.Name).Str("namespace", gateway.Namespace).Logger() ctxLog := logger.WithContext(ctx) if _, ok := gatewayClassNames[string(gateway.Spec.GatewayClassName)]; !ok { continue } cfg, err := p.createGatewayConf(ctxLog, client, gateway) if err != nil { logger.Error().Err(err).Send() continue } cfgs[gateway.Name+gateway.Namespace] = cfg } conf := provider.Merge(ctx, cfgs) conf.TLS = &dynamic.TLSConfiguration{} for _, cfg := range cfgs { if conf.TLS == nil { conf.TLS = &dynamic.TLSConfiguration{} } conf.TLS.Certificates = append(conf.TLS.Certificates, cfg.TLS.Certificates...) for name, options := range cfg.TLS.Options { if conf.TLS.Options == nil { conf.TLS.Options = map[string]tls.Options{} } conf.TLS.Options[name] = options } for name, store := range cfg.TLS.Stores { if conf.TLS.Stores == nil { conf.TLS.Stores = map[string]tls.Store{} } conf.TLS.Stores[name] = store } } return conf } func (p *Provider) createGatewayConf(ctx context.Context, client Client, gateway *v1alpha2.Gateway) (*dynamic.Configuration, error) { conf := &dynamic.Configuration{ UDP: &dynamic.UDPConfiguration{ Routers: map[string]*dynamic.UDPRouter{}, Services: map[string]*dynamic.UDPService{}, }, TCP: &dynamic.TCPConfiguration{ Routers: map[string]*dynamic.TCPRouter{}, Services: map[string]*dynamic.TCPService{}, }, HTTP: &dynamic.HTTPConfiguration{ Routers: map[string]*dynamic.Router{}, Middlewares: map[string]*dynamic.Middleware{}, Services: map[string]*dynamic.Service{}, }, TLS: &dynamic.TLSConfiguration{}, } tlsConfigs := make(map[string]*tls.CertAndStores) // GatewayReasonListenersNotValid is used when one or more // Listeners have an invalid or unsupported configuration // and cannot be configured on the Gateway. listenerStatuses := p.fillGatewayConf(ctx, client, gateway, conf, tlsConfigs) gatewayStatus, errG := p.makeGatewayStatus(listenerStatuses) err := client.UpdateGatewayStatus(gateway, gatewayStatus) if err != nil { return nil, fmt.Errorf("an error occurred while updating gateway status: %w", err) } if errG != nil { return nil, fmt.Errorf("an error occurred while creating gateway status: %w", errG) } if len(tlsConfigs) > 0 { conf.TLS.Certificates = append(conf.TLS.Certificates, getTLSConfig(tlsConfigs)...) } return conf, nil } func (p *Provider) fillGatewayConf(ctx context.Context, client Client, gateway *v1alpha2.Gateway, conf *dynamic.Configuration, tlsConfigs map[string]*tls.CertAndStores) []v1alpha2.ListenerStatus { logger := log.Ctx(ctx) listenerStatuses := make([]v1alpha2.ListenerStatus, len(gateway.Spec.Listeners)) allocatedListeners := make(map[string]struct{}) for i, listener := range gateway.Spec.Listeners { listenerStatuses[i] = v1alpha2.ListenerStatus{ Name: listener.Name, SupportedKinds: []v1alpha2.RouteGroupKind{}, Conditions: []metav1.Condition{}, } supportedKinds, conditions := supportedRouteKinds(listener.Protocol) if len(conditions) > 0 { listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, conditions...) continue } listenerStatuses[i].SupportedKinds = supportedKinds routeKinds, conditions := getAllowedRouteKinds(listener, supportedKinds) if len(conditions) > 0 { listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, conditions...) continue } listenerKey := makeListenerKey(listener) if _, ok := allocatedListeners[listenerKey]; ok { listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionConflicted), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: "DuplicateListener", Message: "A listener with same protocol, port and hostname already exists", }) continue } allocatedListeners[listenerKey] = struct{}{} ep, err := p.entryPointName(listener.Port, listener.Protocol) if err != nil { // update "Detached" status with "PortUnavailable" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonPortUnavailable), Message: fmt.Sprintf("Cannot find entryPoint for Gateway: %v", err), }) continue } if (listener.Protocol == v1alpha2.HTTPProtocolType || listener.Protocol == v1alpha2.TCPProtocolType) && listener.TLS != nil { listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: "InvalidTLSConfiguration", // TODO check the spec if a proper reason is introduced at some point Message: "TLS configuration must no be defined when using HTTP or TCP protocol", }) continue } // TLS if listener.Protocol == v1alpha2.HTTPSProtocolType || listener.Protocol == v1alpha2.TLSProtocolType { if listener.TLS == nil || (len(listener.TLS.CertificateRefs) == 0 && listener.TLS.Mode != nil && *listener.TLS.Mode != v1alpha2.TLSModePassthrough) { // update "Detached" status with "UnsupportedProtocol" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: "InvalidTLSConfiguration", // TODO check the spec if a proper reason is introduced at some point Message: fmt.Sprintf("No TLS configuration for Gateway Listener %s:%d and protocol %q", listener.Name, listener.Port, listener.Protocol), }) continue } var tlsModeType v1alpha2.TLSModeType if listener.TLS.Mode != nil { tlsModeType = *listener.TLS.Mode } isTLSPassthrough := tlsModeType == v1alpha2.TLSModePassthrough if isTLSPassthrough && len(listener.TLS.CertificateRefs) > 0 { // https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.GatewayTLSConfig logger.Warn().Msg("In case of Passthrough TLS mode, no TLS settings take effect as the TLS session from the client is NOT terminated at the Gateway") } // Allowed configurations: // Protocol TLS -> Passthrough -> TLSRoute/TCPRoute // Protocol TLS -> Terminate -> TLSRoute/TCPRoute // Protocol HTTPS -> Terminate -> HTTPRoute if listener.Protocol == v1alpha2.HTTPSProtocolType && isTLSPassthrough { listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonUnsupportedProtocol), Message: "HTTPS protocol is not supported with TLS mode Passthrough", }) continue } if !isTLSPassthrough { if len(listener.TLS.CertificateRefs) == 0 { // update "ResolvedRefs" status true with "InvalidCertificateRef" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonInvalidCertificateRef), Message: "One TLS CertificateRef is required in Terminate mode", }) continue } // TODO Should we support multiple certificates? certificateRef := listener.TLS.CertificateRefs[0] if certificateRef.Kind == nil || *certificateRef.Kind != "Secret" || certificateRef.Group == nil || (*certificateRef.Group != "" && *certificateRef.Group != "core") { // update "ResolvedRefs" status true with "InvalidCertificateRef" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonInvalidCertificateRef), Message: fmt.Sprintf("Unsupported TLS CertificateRef group/kind: %v/%v", certificateRef.Group, certificateRef.Kind), }) continue } // TODO Support ReferencePolicy to support cross namespace references. if certificateRef.Namespace != nil && string(*certificateRef.Namespace) != gateway.Namespace { listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonInvalidCertificateRef), Message: "Cross namespace secrets are not supported", }) continue } configKey := gateway.Namespace + "/" + string(certificateRef.Name) if _, tlsExists := tlsConfigs[configKey]; !tlsExists { tlsConf, err := getTLS(client, certificateRef.Name, gateway.Namespace) if err != nil { // update "ResolvedRefs" status true with "InvalidCertificateRef" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonInvalidCertificateRef), Message: fmt.Sprintf("Error while retrieving certificate: %v", err), }) continue } tlsConfigs[configKey] = tlsConf } } } for _, routeKind := range routeKinds { switch routeKind.Kind { case kindHTTPRoute: listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, gatewayHTTPRouteToHTTPConf(ctx, ep, listener, gateway, client, conf)...) case kindTCPRoute: listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, gatewayTCPRouteToTCPConf(ctx, ep, listener, gateway, client, conf)...) case kindTLSRoute: listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, gatewayTLSRouteToTCPConf(ctx, ep, listener, gateway, client, conf)...) } } } return listenerStatuses } func (p *Provider) makeGatewayStatus(listenerStatuses []v1alpha2.ListenerStatus) (v1alpha2.GatewayStatus, error) { // As Status.Addresses are not implemented yet, we initialize an empty array to follow the API expectations. gatewayStatus := v1alpha2.GatewayStatus{ Addresses: []v1alpha2.GatewayAddress{}, } var result error for i, listener := range listenerStatuses { if len(listener.Conditions) == 0 { // GatewayConditionReady "Ready", GatewayConditionReason "ListenerReady" listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionReady), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: "ListenerReady", Message: "No error found", }) continue } for _, condition := range listener.Conditions { result = multierror.Append(result, errors.New(condition.Message)) } } if result != nil { // GatewayConditionReady "Ready", GatewayConditionReason "ListenersNotValid" gatewayStatus.Conditions = append(gatewayStatus.Conditions, metav1.Condition{ Type: string(v1alpha2.GatewayConditionReady), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.GatewayReasonListenersNotValid), Message: "All Listeners must be valid", }) return gatewayStatus, result } gatewayStatus.Listeners = listenerStatuses gatewayStatus.Conditions = append(gatewayStatus.Conditions, // update "Scheduled" status with "ResourcesAvailable" reason metav1.Condition{ Type: string(v1alpha2.GatewayConditionScheduled), Status: metav1.ConditionTrue, Reason: "ResourcesAvailable", Message: "Resources available", LastTransitionTime: metav1.Now(), }, // update "Ready" status with "ListenersValid" reason metav1.Condition{ Type: string(v1alpha2.GatewayConditionReady), Status: metav1.ConditionTrue, Reason: "ListenersValid", Message: "Listeners valid", LastTransitionTime: metav1.Now(), }, ) return gatewayStatus, nil } func (p *Provider) entryPointName(port v1alpha2.PortNumber, protocol v1alpha2.ProtocolType) (string, error) { portStr := strconv.FormatInt(int64(port), 10) for name, entryPoint := range p.EntryPoints { if strings.HasSuffix(entryPoint.Address, ":"+portStr) { // If the protocol is HTTP the entryPoint must have no TLS conf // Not relevant for v1alpha2.TLSProtocolType && v1alpha2.TCPProtocolType if protocol == v1alpha2.HTTPProtocolType && entryPoint.HasHTTPTLSConf { continue } return name, nil } } return "", fmt.Errorf("no matching entryPoint for port %d and protocol %q", port, protocol) } func supportedRouteKinds(protocol v1alpha2.ProtocolType) ([]v1alpha2.RouteGroupKind, []metav1.Condition) { group := v1alpha2.Group(v1alpha2.GroupName) switch protocol { case v1alpha2.TCPProtocolType: return []v1alpha2.RouteGroupKind{{Kind: kindTCPRoute, Group: &group}}, nil case v1alpha2.HTTPProtocolType, v1alpha2.HTTPSProtocolType: return []v1alpha2.RouteGroupKind{{Kind: kindHTTPRoute, Group: &group}}, nil case v1alpha2.TLSProtocolType: return []v1alpha2.RouteGroupKind{ {Kind: kindTCPRoute, Group: &group}, {Kind: kindTLSRoute, Group: &group}, }, nil } return nil, []metav1.Condition{{ Type: string(v1alpha2.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonUnsupportedProtocol), Message: fmt.Sprintf("Unsupported listener protocol %q", protocol), }} } func getAllowedRouteKinds(listener v1alpha2.Listener, supportedKinds []v1alpha2.RouteGroupKind) ([]v1alpha2.RouteGroupKind, []metav1.Condition) { if listener.AllowedRoutes == nil || len(listener.AllowedRoutes.Kinds) == 0 { return supportedKinds, nil } var ( routeKinds []v1alpha2.RouteGroupKind conditions []metav1.Condition ) uniqRouteKinds := map[v1alpha2.Kind]struct{}{} for _, routeKind := range listener.AllowedRoutes.Kinds { var isSupported bool for _, kind := range supportedKinds { if routeKind.Kind == kind.Kind && routeKind.Group != nil && *routeKind.Group == *kind.Group { isSupported = true break } } if !isSupported { conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonInvalidRouteKinds), Message: fmt.Sprintf("Listener protocol %q does not support RouteGroupKind %v/%s", listener.Protocol, routeKind.Group, routeKind.Kind), }) continue } if _, exists := uniqRouteKinds[routeKind.Kind]; !exists { routeKinds = append(routeKinds, routeKind) uniqRouteKinds[routeKind.Kind] = struct{}{} } } return routeKinds, conditions } func gatewayHTTPRouteToHTTPConf(ctx context.Context, ep string, listener v1alpha2.Listener, gateway *v1alpha2.Gateway, client Client, conf *dynamic.Configuration) []metav1.Condition { if listener.AllowedRoutes == nil { // Should not happen due to validation. return nil } namespaces, err := getRouteBindingSelectorNamespace(client, gateway.Namespace, listener.AllowedRoutes.Namespaces) if err != nil { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason return []metav1.Condition{{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidRouteNamespacesSelector", // Should never happen as the selector is validated by kubernetes Message: fmt.Sprintf("Invalid route namespaces selector: %v", err), }} } routes, err := client.GetHTTPRoutes(namespaces) if err != nil { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason return []metav1.Condition{{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonRefNotPermitted), Message: fmt.Sprintf("Cannot fetch HTTPRoutes: %v", err), }} } if len(routes) == 0 { log.Ctx(ctx).Debug().Msg("No HTTPRoutes found") return nil } var conditions []metav1.Condition for _, route := range routes { if !shouldAttach(gateway, listener, route.Namespace, route.Spec.CommonRouteSpec) { continue } hostnames := matchingHostnames(listener, route.Spec.Hostnames) if len(hostnames) == 0 && listener.Hostname != nil && *listener.Hostname != "" && len(route.Spec.Hostnames) > 0 { // TODO update the corresponding route parent status // https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.TLSRoute continue } hostRule, err := hostRule(hostnames) if err != nil { conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidRouteHostname", // TODO check the spec if a proper reason is introduced at some point Message: fmt.Sprintf("Skipping HTTPRoute %s: invalid hostname: %v", route.Name, err), }) continue } for _, routeRule := range route.Spec.Rules { rule, err := extractRule(routeRule, hostRule) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "UnsupportedPathOrHeaderType", // TODO check the spec if a proper reason is introduced at some point Message: fmt.Sprintf("Skipping HTTPRoute %s: cannot generate rule: %v", route.Name, err), }) } router := dynamic.Router{ Rule: rule, EntryPoints: []string{ep}, } if listener.Protocol == v1alpha2.HTTPSProtocolType && listener.TLS != nil { // TODO support let's encrypt router.TLS = &dynamic.RouterTLSConfig{} } // Adding the gateway desc and the entryPoint desc prevents overlapping of routers build from the same routes. routerName := route.Name + "-" + gateway.Name + "-" + ep routerKey, err := makeRouterKey(router.Rule, makeID(route.Namespace, routerName)) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidRouterKey", // Should never happen Message: fmt.Sprintf("Skipping HTTPRoute %s: cannot make router's key with rule %s: %v", route.Name, router.Rule, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } if len(routeRule.BackendRefs) == 0 { continue } // Traefik internal service can be used only if there is only one BackendRef service reference. if len(routeRule.BackendRefs) == 1 && isInternalService(routeRule.BackendRefs[0].BackendRef) { router.Service = string(routeRule.BackendRefs[0].Name) } else { wrrService, subServices, err := loadServices(client, route.Namespace, routeRule.BackendRefs) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidBackendRefs", // TODO check the spec if a proper reason is introduced at some point Message: fmt.Sprintf("Cannot load HTTPRoute service %s/%s: %v", route.Namespace, route.Name, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } for svcName, svc := range subServices { conf.HTTP.Services[svcName] = svc } serviceName := provider.Normalize(routerKey + "-wrr") conf.HTTP.Services[serviceName] = wrrService router.Service = serviceName } routerKey = provider.Normalize(routerKey) conf.HTTP.Routers[routerKey] = &router } } return conditions } func gatewayTCPRouteToTCPConf(ctx context.Context, ep string, listener v1alpha2.Listener, gateway *v1alpha2.Gateway, client Client, conf *dynamic.Configuration) []metav1.Condition { if listener.AllowedRoutes == nil { // Should not happen due to validation. return nil } namespaces, err := getRouteBindingSelectorNamespace(client, gateway.Namespace, listener.AllowedRoutes.Namespaces) if err != nil { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason return []metav1.Condition{{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidRouteNamespacesSelector", // TODO should never happen as the selector is validated by Kubernetes Message: fmt.Sprintf("Invalid route namespaces selector: %v", err), }} } routes, err := client.GetTCPRoutes(namespaces) if err != nil { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason return []metav1.Condition{{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonRefNotPermitted), Message: fmt.Sprintf("Cannot fetch TCPRoutes: %v", err), }} } if len(routes) == 0 { log.Ctx(ctx).Debug().Msg("No TCPRoutes found") return nil } var conditions []metav1.Condition for _, route := range routes { if !shouldAttach(gateway, listener, route.Namespace, route.Spec.CommonRouteSpec) { continue } router := dynamic.TCPRouter{ Rule: "HostSNI(`*`)", // Gateway listener hostname not available in TCP EntryPoints: []string{ep}, } if listener.Protocol == v1alpha2.TLSProtocolType && listener.TLS != nil { // TODO support let's encrypt router.TLS = &dynamic.RouterTCPTLSConfig{ Passthrough: listener.TLS.Mode != nil && *listener.TLS.Mode == v1alpha2.TLSModePassthrough, } } // Adding the gateway desc and the entryPoint desc prevents overlapping of routers build from the same routes. routerName := route.Name + "-" + gateway.Name + "-" + ep routerKey, err := makeRouterKey("", makeID(route.Namespace, routerName)) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidRouterKey", // Should never happen Message: fmt.Sprintf("Skipping TCPRoute %s: cannot make router's key with rule %s: %v", route.Name, router.Rule, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } routerKey = provider.Normalize(routerKey) var ruleServiceNames []string for i, rule := range route.Spec.Rules { if rule.BackendRefs == nil { // Should not happen due to validation. // https://github.com/kubernetes-sigs/gateway-api/blob/v0.4.0/apis/v1alpha2/tcproute_types.go#L76 continue } wrrService, subServices, err := loadTCPServices(client, route.Namespace, rule.BackendRefs) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidBackendRefs", // TODO check the spec if a proper reason is introduced at some point Message: fmt.Sprintf("Cannot load TCPRoute service %s/%s: %v", route.Namespace, route.Name, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } for svcName, svc := range subServices { conf.TCP.Services[svcName] = svc } serviceName := fmt.Sprintf("%s-wrr-%d", routerKey, i) conf.TCP.Services[serviceName] = wrrService ruleServiceNames = append(ruleServiceNames, serviceName) } if len(ruleServiceNames) == 1 { router.Service = ruleServiceNames[0] conf.TCP.Routers[routerKey] = &router continue } routeServiceKey := routerKey + "-wrr" routeService := &dynamic.TCPService{Weighted: &dynamic.TCPWeightedRoundRobin{}} for _, name := range ruleServiceNames { service := dynamic.TCPWRRService{Name: name} service.SetDefaults() routeService.Weighted.Services = append(routeService.Weighted.Services, service) } conf.TCP.Services[routeServiceKey] = routeService router.Service = routeServiceKey conf.TCP.Routers[routerKey] = &router } return conditions } func gatewayTLSRouteToTCPConf(ctx context.Context, ep string, listener v1alpha2.Listener, gateway *v1alpha2.Gateway, client Client, conf *dynamic.Configuration) []metav1.Condition { if listener.AllowedRoutes == nil { // Should not happen due to validation. return nil } namespaces, err := getRouteBindingSelectorNamespace(client, gateway.Namespace, listener.AllowedRoutes.Namespaces) if err != nil { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason return []metav1.Condition{{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidRouteNamespacesSelector", // TODO should never happen as the selector is validated by Kubernetes Message: fmt.Sprintf("Invalid route namespaces selector: %v", err), }} } routes, err := client.GetTLSRoutes(namespaces) if err != nil { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason return []metav1.Condition{{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha2.ListenerReasonRefNotPermitted), Message: fmt.Sprintf("Cannot fetch TLSRoutes: %v", err), }} } if len(routes) == 0 { log.Ctx(ctx).Debug().Msg("No TLSRoutes found") return nil } var conditions []metav1.Condition for _, route := range routes { if !shouldAttach(gateway, listener, route.Namespace, route.Spec.CommonRouteSpec) { continue } hostnames := matchingHostnames(listener, route.Spec.Hostnames) if len(hostnames) == 0 && listener.Hostname != nil && *listener.Hostname != "" && len(route.Spec.Hostnames) > 0 { // TODO update the corresponding route parent status // https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.TLSRoute continue } rule, err := hostSNIRule(hostnames) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidHostnames", // TODO check the spec if a proper reason is introduced at some point Message: fmt.Sprintf("Skipping TLSRoute %s: cannot make route's SNI match: %v", route.Name, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } router := dynamic.TCPRouter{ Rule: rule, EntryPoints: []string{ep}, TLS: &dynamic.RouterTCPTLSConfig{ Passthrough: listener.TLS.Mode != nil && *listener.TLS.Mode == v1alpha2.TLSModePassthrough, }, } // Adding the gateway desc and the entryPoint desc prevents overlapping of routers build from the same routes. routerName := route.Name + "-" + gateway.Name + "-" + ep routerKey, err := makeRouterKey(rule, makeID(route.Namespace, routerName)) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidRouterKey", // Should never happen Message: fmt.Sprintf("Skipping TLSRoute %s: cannot make router's key with rule %s: %v", route.Name, router.Rule, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } routerKey = provider.Normalize(routerKey) var ruleServiceNames []string for i, routeRule := range route.Spec.Rules { if len(routeRule.BackendRefs) == 0 { // Should not happen due to validation. // https://github.com/kubernetes-sigs/gateway-api/blob/v0.4.0/apis/v1alpha2/tlsroute_types.go#L120 continue } wrrService, subServices, err := loadTCPServices(client, route.Namespace, routeRule.BackendRefs) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason conditions = append(conditions, metav1.Condition{ Type: string(v1alpha2.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: "InvalidBackendRefs", // TODO check the spec if a proper reason is introduced at some point Message: fmt.Sprintf("Cannot load TLSRoute service %s/%s: %v", route.Namespace, route.Name, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } for svcName, svc := range subServices { conf.TCP.Services[svcName] = svc } serviceName := fmt.Sprintf("%s-wrr-%d", routerKey, i) conf.TCP.Services[serviceName] = wrrService ruleServiceNames = append(ruleServiceNames, serviceName) } if len(ruleServiceNames) == 1 { router.Service = ruleServiceNames[0] conf.TCP.Routers[routerKey] = &router continue } routeServiceKey := routerKey + "-wrr" routeService := &dynamic.TCPService{Weighted: &dynamic.TCPWeightedRoundRobin{}} for _, name := range ruleServiceNames { service := dynamic.TCPWRRService{Name: name} service.SetDefaults() routeService.Weighted.Services = append(routeService.Weighted.Services, service) } conf.TCP.Services[routeServiceKey] = routeService router.Service = routeServiceKey conf.TCP.Routers[routerKey] = &router } return conditions } // Because of Kubernetes validation we admit that the given Hostnames are valid. // https://github.com/kubernetes-sigs/gateway-api/blob/ff9883da4cad8554cd300394f725ab3a27502785/apis/v1alpha2/shared_types.go#L252 func matchingHostnames(listener v1alpha2.Listener, hostnames []v1alpha2.Hostname) []v1alpha2.Hostname { if listener.Hostname == nil || *listener.Hostname == "" { return hostnames } if len(hostnames) == 0 { return []v1alpha2.Hostname{*listener.Hostname} } listenerLabels := strings.Split(string(*listener.Hostname), ".") var matches []v1alpha2.Hostname for _, hostname := range hostnames { if hostname == *listener.Hostname { matches = append(matches, hostname) continue } hostnameLabels := strings.Split(string(hostname), ".") if len(listenerLabels) != len(hostnameLabels) { continue } if !slices.Equal(listenerLabels[1:], hostnameLabels[1:]) { continue } if listenerLabels[0] == "*" { matches = append(matches, hostname) continue } if hostnameLabels[0] == "*" { matches = append(matches, *listener.Hostname) continue } } return matches } func shouldAttach(gateway *v1alpha2.Gateway, listener v1alpha2.Listener, routeNamespace string, routeSpec v1alpha2.CommonRouteSpec) bool { for _, parentRef := range routeSpec.ParentRefs { if parentRef.Group == nil || *parentRef.Group != v1alpha2.GroupName { continue } if parentRef.Kind == nil || *parentRef.Kind != kindGateway { continue } if parentRef.SectionName != nil && *parentRef.SectionName != listener.Name { continue } namespace := routeNamespace if parentRef.Namespace != nil { namespace = string(*parentRef.Namespace) } if namespace == gateway.Namespace && string(parentRef.Name) == gateway.Name { return true } } return false } func getRouteBindingSelectorNamespace(client Client, gatewayNamespace string, routeNamespaces *v1alpha2.RouteNamespaces) ([]string, error) { if routeNamespaces == nil || routeNamespaces.From == nil { return []string{gatewayNamespace}, nil } switch *routeNamespaces.From { case v1alpha2.NamespacesFromAll: return []string{metav1.NamespaceAll}, nil case v1alpha2.NamespacesFromSame: return []string{gatewayNamespace}, nil case v1alpha2.NamespacesFromSelector: selector, err := metav1.LabelSelectorAsSelector(routeNamespaces.Selector) if err != nil { return nil, fmt.Errorf("malformed selector: %w", err) } return client.GetNamespaces(selector) } return nil, fmt.Errorf("unsupported RouteSelectType: %q", *routeNamespaces.From) } func hostRule(hostnames []v1alpha2.Hostname) (string, error) { var hostNames []string var hostRegexNames []string for _, hostname := range hostnames { host := string(hostname) // When unspecified, "", or *, all hostnames are matched. // This field can be omitted for protocols that don't require hostname based matching. // TODO Refactor this when building support for TLS options. if host == "*" || host == "" { return "", nil } wildcard := strings.Count(host, "*") if wildcard == 0 { hostNames = append(hostNames, host) continue } // https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.Hostname if !strings.HasPrefix(host, "*.") || wildcard > 1 { return "", fmt.Errorf("invalid rule: %q", host) } hostRegexNames = append(hostRegexNames, strings.Replace(host, "*.", "{subdomain:[a-zA-Z0-9-]+}.", 1)) } var res string if len(hostNames) > 0 { res = "Host(`" + strings.Join(hostNames, "`, `") + "`)" } if len(hostRegexNames) == 0 { return res, nil } hostRegexp := "HostRegexp(`" + strings.Join(hostRegexNames, "`, `") + "`)" if len(res) > 0 { return "(" + res + " || " + hostRegexp + ")", nil } return hostRegexp, nil } func hostSNIRule(hostnames []v1alpha2.Hostname) (string, error) { var matchers []string uniqHostnames := map[v1alpha2.Hostname]struct{}{} for _, hostname := range hostnames { if len(hostname) == 0 { continue } if _, exists := uniqHostnames[hostname]; exists { continue } h := string(hostname) // TODO support wildcard hostnames with an HostSNI regexp matcher if strings.Contains(h, "*") { return "", fmt.Errorf("wildcard hostname is not supported: %q", h) } matchers = append(matchers, "`"+h+"`") uniqHostnames[hostname] = struct{}{} } if len(matchers) == 0 { return "HostSNI(`*`)", nil } return "HostSNI(" + strings.Join(matchers, ",") + ")", nil } func extractRule(routeRule v1alpha2.HTTPRouteRule, hostRule string) (string, error) { var rule string var matchesRules []string for _, match := range routeRule.Matches { if (match.Path == nil || match.Path.Type == nil) && match.Headers == nil { continue } var matchRules []string if match.Path != nil && match.Path.Type != nil && match.Path.Value != nil { // TODO handle other path types switch *match.Path.Type { case v1alpha2.PathMatchExact: matchRules = append(matchRules, fmt.Sprintf("Path(`%s`)", *match.Path.Value)) case v1alpha2.PathMatchPathPrefix: matchRules = append(matchRules, fmt.Sprintf("PathPrefix(`%s`)", *match.Path.Value)) default: return "", fmt.Errorf("unsupported path match %s", *match.Path.Type) } } headerRules, err := extractHeaderRules(match.Headers) if err != nil { return "", err } matchRules = append(matchRules, headerRules...) matchesRules = append(matchesRules, strings.Join(matchRules, " && ")) } // If no matches are specified, the default is a prefix // path match on "/", which has the effect of matching every // HTTP request. if len(routeRule.Matches) == 0 { matchesRules = append(matchesRules, "PathPrefix(`/`)") } if hostRule != "" { if len(matchesRules) == 0 { return hostRule, nil } rule += hostRule + " && " } if len(matchesRules) == 1 { return rule + matchesRules[0], nil } if len(rule) == 0 { return strings.Join(matchesRules, " || "), nil } return rule + "(" + strings.Join(matchesRules, " || ") + ")", nil } func extractHeaderRules(headers []v1alpha2.HTTPHeaderMatch) ([]string, error) { var headerRules []string // TODO handle other headers types for _, header := range headers { if header.Type == nil { // Should never happen due to kubernetes validation. continue } switch *header.Type { case v1alpha2.HeaderMatchExact: headerRules = append(headerRules, fmt.Sprintf("Headers(`%s`,`%s`)", header.Name, header.Value)) default: return nil, fmt.Errorf("unsupported header match type %s", *header.Type) } } return headerRules, nil } func makeRouterKey(rule, name string) (string, error) { h := sha256.New() if _, err := h.Write([]byte(rule)); err != nil { return "", err } key := fmt.Sprintf("%s-%.10x", name, h.Sum(nil)) return key, nil } func makeID(namespace, name string) string { if namespace == "" { return name } return namespace + "-" + name } func getTLS(k8sClient Client, secretName v1alpha2.ObjectName, namespace string) (*tls.CertAndStores, error) { secret, exists, err := k8sClient.GetSecret(namespace, string(secretName)) if err != nil { return nil, fmt.Errorf("failed to fetch secret %s/%s: %w", namespace, secretName, err) } if !exists { return nil, fmt.Errorf("secret %s/%s does not exist", namespace, secretName) } cert, key, err := getCertificateBlocks(secret, namespace, string(secretName)) if err != nil { return nil, err } return &tls.CertAndStores{ Certificate: tls.Certificate{ CertFile: tls.FileOrContent(cert), KeyFile: tls.FileOrContent(key), }, }, nil } func getTLSConfig(tlsConfigs map[string]*tls.CertAndStores) []*tls.CertAndStores { var secretNames []string for secretName := range tlsConfigs { secretNames = append(secretNames, secretName) } sort.Strings(secretNames) var configs []*tls.CertAndStores for _, secretName := range secretNames { configs = append(configs, tlsConfigs[secretName]) } return configs } func getCertificateBlocks(secret *corev1.Secret, namespace, secretName string) (string, string, error) { var missingEntries []string tlsCrtData, tlsCrtExists := secret.Data["tls.crt"] if !tlsCrtExists { missingEntries = append(missingEntries, "tls.crt") } tlsKeyData, tlsKeyExists := secret.Data["tls.key"] if !tlsKeyExists { missingEntries = append(missingEntries, "tls.key") } if len(missingEntries) > 0 { return "", "", fmt.Errorf("secret %s/%s is missing the following TLS data entries: %s", namespace, secretName, strings.Join(missingEntries, ", ")) } cert := string(tlsCrtData) if cert == "" { missingEntries = append(missingEntries, "tls.crt") } key := string(tlsKeyData) if key == "" { missingEntries = append(missingEntries, "tls.key") } if len(missingEntries) > 0 { return "", "", fmt.Errorf("secret %s/%s contains the following empty TLS data entries: %s", namespace, secretName, strings.Join(missingEntries, ", ")) } return cert, key, nil } // loadServices is generating a WRR service, even when there is only one target. func loadServices(client Client, namespace string, backendRefs []v1alpha2.HTTPBackendRef) (*dynamic.Service, map[string]*dynamic.Service, error) { services := map[string]*dynamic.Service{} wrrSvc := &dynamic.Service{ Weighted: &dynamic.WeightedRoundRobin{ Services: []dynamic.WRRService{}, }, } for _, backendRef := range backendRefs { if backendRef.Group == nil || backendRef.Kind == nil { // Should not happen as this is validated by kubernetes continue } if isInternalService(backendRef.BackendRef) { return nil, nil, fmt.Errorf("traefik internal service %s is not allowed in a WRR loadbalancer", backendRef.BackendRef.Name) } weight := int(pointer.Int32Deref(backendRef.Weight, 1)) if *backendRef.Group == traefikv1alpha1.GroupName && *backendRef.Kind == kindTraefikService { wrrSvc.Weighted.Services = append(wrrSvc.Weighted.Services, dynamic.WRRService{Name: string(backendRef.Name), Weight: &weight}) continue } if *backendRef.Group != "" && *backendRef.Group != "core" && *backendRef.Kind != "Service" { return nil, nil, fmt.Errorf("unsupported HTTPBackendRef %s/%s/%s", *backendRef.Group, *backendRef.Kind, backendRef.Name) } lb := &dynamic.ServersLoadBalancer{} lb.SetDefaults() svc := dynamic.Service{LoadBalancer: lb} // TODO support cross namespace through ReferencePolicy service, exists, err := client.GetService(namespace, string(backendRef.Name)) if err != nil { return nil, nil, err } if !exists { return nil, nil, errors.New("service not found") } if len(service.Spec.Ports) > 1 && backendRef.Port == nil { // If the port is unspecified and the backend is a Service // object consisting of multiple port definitions, the route // must be dropped from the Gateway. The controller should // raise the "ResolvedRefs" condition on the Gateway with the // "DroppedRoutes" reason. The gateway status for this route // should be updated with a condition that describes the error // more specifically. log.Error().Msg("A multiple ports Kubernetes Service cannot be used if unspecified backendRef.Port") continue } var portSpec corev1.ServicePort var match bool for _, p := range service.Spec.Ports { if backendRef.Port == nil || p.Port == int32(*backendRef.Port) { portSpec = p match = true break } } if !match { return nil, nil, errors.New("service port not found") } endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, string(backendRef.Name)) if endpointsErr != nil { return nil, nil, endpointsErr } if !endpointsExists { return nil, nil, errors.New("endpoints not found") } if len(endpoints.Subsets) == 0 { return nil, nil, errors.New("subset not found") } var port int32 var portStr string for _, subset := range endpoints.Subsets { for _, p := range subset.Ports { if portSpec.Name == p.Name { port = p.Port break } } if port == 0 { return nil, nil, errors.New("cannot define a port") } protocol := getProtocol(portSpec) portStr = strconv.FormatInt(int64(port), 10) for _, addr := range subset.Addresses { svc.LoadBalancer.Servers = append(svc.LoadBalancer.Servers, dynamic.Server{ URL: fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(addr.IP, portStr)), }) } } serviceName := provider.Normalize(makeID(service.Namespace, service.Name) + "-" + portStr) services[serviceName] = &svc wrrSvc.Weighted.Services = append(wrrSvc.Weighted.Services, dynamic.WRRService{Name: serviceName, Weight: &weight}) } if len(wrrSvc.Weighted.Services) == 0 { return nil, nil, errors.New("no service has been created") } return wrrSvc, services, nil } // loadTCPServices is generating a WRR service, even when there is only one target. func loadTCPServices(client Client, namespace string, backendRefs []v1alpha2.BackendRef) (*dynamic.TCPService, map[string]*dynamic.TCPService, error) { services := map[string]*dynamic.TCPService{} wrrSvc := &dynamic.TCPService{ Weighted: &dynamic.TCPWeightedRoundRobin{ Services: []dynamic.TCPWRRService{}, }, } for _, backendRef := range backendRefs { if backendRef.Group == nil || backendRef.Kind == nil { // Should not happen as this is validated by kubernetes continue } if isInternalService(backendRef) { return nil, nil, fmt.Errorf("traefik internal service %s is not allowed in a WRR loadbalancer", backendRef.Name) } weight := int(pointer.Int32Deref(backendRef.Weight, 1)) if *backendRef.Group == traefikv1alpha1.GroupName && *backendRef.Kind == kindTraefikService { wrrSvc.Weighted.Services = append(wrrSvc.Weighted.Services, dynamic.TCPWRRService{Name: string(backendRef.Name), Weight: &weight}) continue } if *backendRef.Group != "" && *backendRef.Group != "core" && *backendRef.Kind != "Service" { return nil, nil, fmt.Errorf("unsupported BackendRef %s/%s/%s", *backendRef.Group, *backendRef.Kind, backendRef.Name) } svc := dynamic.TCPService{ LoadBalancer: &dynamic.TCPServersLoadBalancer{}, } service, exists, err := client.GetService(namespace, string(backendRef.Name)) if err != nil { return nil, nil, err } if !exists { return nil, nil, errors.New("service not found") } if len(service.Spec.Ports) > 1 && backendRef.Port == nil { // If the port is unspecified and the backend is a Service // object consisting of multiple port definitions, the route // must be dropped from the Gateway. The controller should // raise the "ResolvedRefs" condition on the Gateway with the // "DroppedRoutes" reason. The gateway status for this route // should be updated with a condition that describes the error // more specifically. log.Error().Msg("A multiple ports Kubernetes Service cannot be used if unspecified backendRef.Port") continue } var portSpec corev1.ServicePort var match bool for _, p := range service.Spec.Ports { if backendRef.Port == nil || p.Port == int32(*backendRef.Port) { portSpec = p match = true break } } if !match { return nil, nil, errors.New("service port not found") } endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, string(backendRef.Name)) if endpointsErr != nil { return nil, nil, endpointsErr } if !endpointsExists { return nil, nil, errors.New("endpoints not found") } if len(endpoints.Subsets) == 0 { return nil, nil, errors.New("subset not found") } var port int32 var portStr string for _, subset := range endpoints.Subsets { for _, p := range subset.Ports { if portSpec.Name == p.Name { port = p.Port break } } if port == 0 { return nil, nil, errors.New("cannot define a port") } portStr = strconv.FormatInt(int64(port), 10) for _, addr := range subset.Addresses { svc.LoadBalancer.Servers = append(svc.LoadBalancer.Servers, dynamic.TCPServer{ Address: net.JoinHostPort(addr.IP, portStr), }) } } serviceName := provider.Normalize(makeID(service.Namespace, service.Name) + "-" + portStr) services[serviceName] = &svc wrrSvc.Weighted.Services = append(wrrSvc.Weighted.Services, dynamic.TCPWRRService{Name: serviceName, Weight: &weight}) } if len(wrrSvc.Weighted.Services) == 0 { return nil, nil, errors.New("no service has been created") } return wrrSvc, services, nil } func getProtocol(portSpec corev1.ServicePort) string { protocol := "http" if portSpec.Port == 443 || strings.HasPrefix(portSpec.Name, "https") { protocol = "https" } return protocol } 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.Ctx(ctx).Debug().Msgf("Dropping event kind %T due to throttling", nextEvent) } } } }) return eventsChanBuffered } func isInternalService(ref v1alpha2.BackendRef) bool { if ref.Kind == nil || ref.Group == nil { return false } return *ref.Kind == kindTraefikService && *ref.Group == traefikv1alpha1.GroupName && strings.HasSuffix(string(ref.Name), "@internal") } // makeListenerKey joins protocol, hostname, and port of a listener into a string key. func makeListenerKey(l v1alpha2.Listener) string { var hostname v1alpha2.Hostname if l.Hostname != nil { hostname = *l.Hostname } return fmt.Sprintf("%s|%s|%d", l.Protocol, hostname, l.Port) }