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" 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/log" "github.com/traefik/traefik/v2/pkg/provider" "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" "sigs.k8s.io/gateway-api/apis/v1alpha1" ) const ( providerName = "kubernetesgateway" traefikServiceKind = "TraefikService" traefikServiceGroupName = "traefik.containo.us" ) // 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"` 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) } log.FromContext(ctx).Infof("label selector is: %q", p.LabelSelector) withEndpoint := "" if p.Endpoint != "" { withEndpoint = fmt.Sprintf(" with endpoint %s", p.Endpoint) } var client *clientWrapper switch { case os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "": log.FromContext(ctx).Infof("Creating in-cluster Provider client%s", withEndpoint) client, err = newInClusterClient(p.Endpoint) case os.Getenv("KUBECONFIG") != "": log.FromContext(ctx).Infof("Creating cluster-external Provider client from KUBECONFIG %s", os.Getenv("KUBECONFIG")) client, err = newExternalClusterClientFromFile(os.Getenv("KUBECONFIG")) default: log.FromContext(ctx).Infof("Creating cluster-external Provider client%s", withEndpoint) 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 { ctxLog := log.With(context.Background(), log.Str(log.ProviderName, providerName)) logger := log.FromContext(ctxLog) 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.Errorf("Error watching kubernetes events: %v", err) 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("Unable to hash the configuration") case p.lastConfiguration.Get() == confHash: logger.Debugf("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.Errorf("Provider connection error: %v; retrying in %s", err, time) } err := backoff.RetryNotify(safe.OperationWithRecover(operation), backoff.WithContext(job.NewBackOff(backoff.NewExponentialBackOff()), ctxPool), notify) if err != nil { logger.Errorf("Cannot connect to Provider: %v", err) } }) return nil } // TODO Handle errors and update resources statuses (gatewayClass, gateway). func (p *Provider) loadConfigurationFromGateway(ctx context.Context, client Client) *dynamic.Configuration { logger := log.FromContext(ctx) gatewayClassNames := map[string]struct{}{} gatewayClasses, err := client.GetGatewayClasses() if err != nil { logger.Errorf("Cannot find GatewayClasses: %v", err) 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.Controller == "traefik.io/gateway-controller" { gatewayClassNames[gatewayClass.Name] = struct{}{} err := client.UpdateGatewayClassStatus(gatewayClass, metav1.Condition{ Type: string(v1alpha1.GatewayClassConditionStatusAdmitted), Status: metav1.ConditionTrue, Reason: "Handled", Message: "Handled by Traefik controller", LastTransitionTime: metav1.Now(), }) if err != nil { logger.Errorf("Failed to update %s condition: %v", v1alpha1.GatewayClassConditionStatusAdmitted, err) } } } cfgs := map[string]*dynamic.Configuration{} // TODO check if we can only use the default filtering mechanism for _, gateway := range client.GetGateways() { ctxLog := log.With(ctx, log.Str("gateway", gateway.Name), log.Str("namespace", gateway.Namespace)) logger := log.FromContext(ctxLog) if _, ok := gatewayClassNames[gateway.Spec.GatewayClassName]; !ok { continue } cfg, err := p.createGatewayConf(client, gateway) if err != nil { logger.Error(err) 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(client Client, gateway *v1alpha1.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(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(client Client, gateway *v1alpha1.Gateway, conf *dynamic.Configuration, tlsConfigs map[string]*tls.CertAndStores) []v1alpha1.ListenerStatus { listenerStatuses := make([]v1alpha1.ListenerStatus, len(gateway.Spec.Listeners)) for i, listener := range gateway.Spec.Listeners { listenerStatuses[i] = v1alpha1.ListenerStatus{ Port: listener.Port, Conditions: []metav1.Condition{}, } // Supported Protocol if listener.Protocol != v1alpha1.HTTPProtocolType && listener.Protocol != v1alpha1.HTTPSProtocolType { // update "Detached" status true with "UnsupportedProtocol" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonUnsupportedProtocol), Message: fmt.Sprintf("Unsupported listener protocol %q", listener.Protocol), }) continue } 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(v1alpha1.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonPortUnavailable), Message: fmt.Sprintf("Cannot find entryPoint for Gateway: %v", err), }) continue } if listener.Protocol == v1alpha1.HTTPSProtocolType { if listener.TLS == nil { // update "Detached" status with "UnsupportedProtocol" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionDetached), Status: metav1.ConditionTrue, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonUnsupportedProtocol), Message: fmt.Sprintf("No TLS configuration for Gateway Listener port %d and protocol %q", listener.Port, listener.Protocol), }) continue } if listener.TLS.CertificateRef.Kind != "Secret" || listener.TLS.CertificateRef.Group != "core" { // update "ResolvedRefs" status true with "InvalidCertificateRef" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonInvalidCertificateRef), Message: fmt.Sprintf("Unsupported TLS CertificateRef group/kind : %v/%v", listener.TLS.CertificateRef.Group, listener.TLS.CertificateRef.Kind), }) continue } configKey := gateway.Namespace + "/" + listener.TLS.CertificateRef.Name if _, tlsExists := tlsConfigs[configKey]; !tlsExists { tlsConf, err := getTLS(client, listener.TLS.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(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonInvalidCertificateRef), Message: fmt.Sprintf("Error while retrieving certificate: %v", err), }) continue } tlsConfigs[configKey] = tlsConf } } // Supported Route types if listener.Routes.Kind != "HTTPRoute" { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonInvalidRoutesRef), Message: fmt.Sprintf("Unsupported Route Kind %q", listener.Routes.Kind), }) continue } // TODO: support RouteNamespaces httpRoutes, err := client.GetHTTPRoutes(gateway.Namespace, labels.SelectorFromSet(listener.Routes.Selector.MatchLabels)) if err != nil { // update "ResolvedRefs" status true with "InvalidRoutesRef" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonInvalidRoutesRef), Message: fmt.Sprintf("Cannot fetch HTTPRoutes for namespace %q and matchLabels %v", gateway.Namespace, listener.Routes.Selector.MatchLabels), }) continue } for _, httpRoute := range httpRoutes { // Should never happen if httpRoute == nil { continue } hostRule, err := hostRule(httpRoute.Spec) if err != nil { listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonDegradedRoutes), Message: fmt.Sprintf("Skipping HTTPRoute %s: invalid hostname: %v", httpRoute.Name, err), }) continue } for _, routeRule := range httpRoute.Spec.Rules { rule, err := extractRule(routeRule, hostRule) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonDegradedRoutes), Message: fmt.Sprintf("Skipping HTTPRoute %s: cannot generate rule: %v", httpRoute.Name, err), }) continue } router := dynamic.Router{ Rule: rule, EntryPoints: []string{ep}, } if listener.TLS != nil { // TODO support let's encrypt router.TLS = &dynamic.RouterTLSConfig{} } // Adding the gateway name and the entryPoint name prevents overlapping of routers build from the same routes. routerName := httpRoute.Name + "-" + gateway.Name + "-" + ep routerKey, err := makeRouterKey(router.Rule, makeID(httpRoute.Namespace, routerName)) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonDegradedRoutes), Message: fmt.Sprintf("Skipping HTTPRoute %s: cannot make router's key with rule %s: %v", httpRoute.Name, router.Rule, err), }) // TODO update the RouteStatus condition / deduplicate conditions on listener continue } if routeRule.ForwardTo != nil { // Traefik internal service can be used only if there is only one ForwardTo service reference. if len(routeRule.ForwardTo) == 1 && isInternalService(routeRule.ForwardTo[0]) { router.Service = routeRule.ForwardTo[0].BackendRef.Name } else { wrrService, subServices, err := loadServices(client, gateway.Namespace, routeRule.ForwardTo) if err != nil { // update "ResolvedRefs" status true with "DroppedRoutes" reason listenerStatuses[i].Conditions = append(listenerStatuses[i].Conditions, metav1.Condition{ Type: string(v1alpha1.ListenerConditionResolvedRefs), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.ListenerReasonDegradedRoutes), Message: fmt.Sprintf("Cannot load service from HTTPRoute %s/%s : %v", gateway.Namespace, httpRoute.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 } } if router.Service != "" { routerKey = provider.Normalize(routerKey) conf.HTTP.Routers[routerKey] = &router } } } } return listenerStatuses } func (p *Provider) makeGatewayStatus(listenerStatuses []v1alpha1.ListenerStatus) (v1alpha1.GatewayStatus, error) { // As Status.Addresses are not implemented yet, we initialize an empty array to follow the API expectations. gatewayStatus := v1alpha1.GatewayStatus{ Addresses: []v1alpha1.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(v1alpha1.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(v1alpha1.GatewayConditionReady), Status: metav1.ConditionFalse, LastTransitionTime: metav1.Now(), Reason: string(v1alpha1.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(v1alpha1.GatewayConditionScheduled), Status: metav1.ConditionTrue, Reason: "ResourcesAvailable", Message: "Resources available", LastTransitionTime: metav1.Now(), }, // update "Ready" status with "ListenersValid" reason metav1.Condition{ Type: string(v1alpha1.GatewayConditionReady), Status: metav1.ConditionTrue, Reason: "ListenersValid", Message: "Listeners valid", LastTransitionTime: metav1.Now(), }, ) return gatewayStatus, nil } func hostRule(httpRouteSpec v1alpha1.HTTPRouteSpec) (string, error) { var hostNames []string var hostRegexNames []string for _, hostname := range httpRouteSpec.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/spec/#networking.x-k8s.io/v1alpha1.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 extractRule(routeRule v1alpha1.HTTPRouteRule, hostRule string) (string, error) { var rule string var matchesRules []string for _, match := range routeRule.Matches { if len(match.Path.Type) == 0 && match.Headers == nil { continue } var matchRules []string // TODO handle other path types if len(match.Path.Type) > 0 { switch match.Path.Type { case v1alpha1.PathMatchExact: matchRules = append(matchRules, "Path(`"+match.Path.Value+"`)") case v1alpha1.PathMatchPrefix: matchRules = append(matchRules, "PathPrefix(`"+match.Path.Value+"`)") default: return "", fmt.Errorf("unsupported path match %s", match.Path.Type) } } // TODO handle other headers types if match.Headers != nil { switch match.Headers.Type { case v1alpha1.HeaderMatchExact: var headerRules []string for headerName, headerValue := range match.Headers.Values { headerRules = append(headerRules, "Headers(`"+headerName+"`,`"+headerValue+"`)") } // to have a consistent order sort.Strings(headerRules) matchRules = append(matchRules, headerRules...) default: return "", fmt.Errorf("unsupported header match type %s", match.Headers.Type) } } 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 (p *Provider) entryPointName(port v1alpha1.PortNumber, protocol v1alpha1.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 if protocol == v1alpha1.HTTPProtocolType && entryPoint.HasHTTPTLSConf { continue } return name, nil } } return "", fmt.Errorf("no matching entryPoint for port %d and protocol %q", port, protocol) } 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, namespace string) (*tls.CertAndStores, error) { secret, exists, err := k8sClient.GetSecret(namespace, 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, 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, targets []v1alpha1.HTTPRouteForwardTo) (*dynamic.Service, map[string]*dynamic.Service, error) { services := map[string]*dynamic.Service{} wrrSvc := &dynamic.Service{ Weighted: &dynamic.WeightedRoundRobin{ Services: []dynamic.WRRService{}, }, } for _, forwardTo := range targets { weight := int(forwardTo.Weight) if forwardTo.ServiceName == nil && forwardTo.BackendRef != nil { if !(forwardTo.BackendRef.Group == traefikServiceGroupName && forwardTo.BackendRef.Kind == traefikServiceKind) { continue } if strings.HasSuffix(forwardTo.BackendRef.Name, "@internal") { return nil, nil, fmt.Errorf("traefik internal service %s is not allowed in a WRR loadbalancer", forwardTo.BackendRef.Name) } wrrSvc.Weighted.Services = append(wrrSvc.Weighted.Services, dynamic.WRRService{Name: forwardTo.BackendRef.Name, Weight: &weight}) continue } if forwardTo.ServiceName == nil { continue } svc := dynamic.Service{ LoadBalancer: &dynamic.ServersLoadBalancer{ PassHostHeader: func(v bool) *bool { return &v }(true), }, } service, exists, err := client.GetService(namespace, *forwardTo.ServiceName) if err != nil { return nil, nil, err } if !exists { return nil, nil, errors.New("service not found") } if len(service.Spec.Ports) > 1 && forwardTo.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.WithoutContext().Errorf("A multiple ports Kubernetes Service cannot be used if unspecified forwardTo.Port") continue } var portName string var portSpec corev1.ServicePort var match bool for _, p := range service.Spec.Ports { if forwardTo.Port == nil || p.Port == int32(*forwardTo.Port) { portName = p.Name portSpec = p match = true break } } if !match { return nil, nil, errors.New("service port not found") } endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, *forwardTo.ServiceName) 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 portName == p.Name { port = p.Port break } } if port == 0 { return nil, nil, errors.New("cannot define a port") } protocol := getProtocol(portSpec, portName) 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 } func getProtocol(portSpec corev1.ServicePort, portName string) string { protocol := "http" if portSpec.Port == 443 || strings.HasPrefix(portName, "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.FromContext(ctx).Debugf("Dropping event kind %T due to throttling", nextEvent) } } } }) return eventsChanBuffered } func isInternalService(forwardTo v1alpha1.HTTPRouteForwardTo) bool { return forwardTo.ServiceName == nil && forwardTo.BackendRef != nil && forwardTo.BackendRef.Kind == traefikServiceKind && forwardTo.BackendRef.Group == traefikServiceGroupName && strings.HasSuffix(forwardTo.BackendRef.Name, "@internal") }