290 lines
7.8 KiB
Go
290 lines
7.8 KiB
Go
package crd
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
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"github.com/containous/traefik/v2/pkg/log"
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"github.com/containous/traefik/v2/pkg/provider/kubernetes/crd/traefik/v1alpha1"
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"github.com/containous/traefik/v2/pkg/tls"
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corev1 "k8s.io/api/core/v1"
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)
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func (p *Provider) loadIngressRouteConfiguration(ctx context.Context, client Client, tlsConfigs map[string]*tls.CertAndStores) *dynamic.HTTPConfiguration {
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conf := &dynamic.HTTPConfiguration{
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Routers: map[string]*dynamic.Router{},
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Middlewares: map[string]*dynamic.Middleware{},
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Services: map[string]*dynamic.Service{},
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}
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for _, ingressRoute := range client.GetIngressRoutes() {
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ctxRt := log.With(ctx, log.Str("ingress", ingressRoute.Name), log.Str("namespace", ingressRoute.Namespace))
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logger := log.FromContext(ctxRt)
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// TODO keep the name ingressClass?
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if !shouldProcessIngress(p.IngressClass, ingressRoute.Annotations[annotationKubernetesIngressClass]) {
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continue
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}
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err := getTLSHTTP(ctx, ingressRoute, client, tlsConfigs)
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if err != nil {
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logger.Errorf("Error configuring TLS: %v", err)
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}
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ingressName := ingressRoute.Name
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if len(ingressName) == 0 {
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ingressName = ingressRoute.GenerateName
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}
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for _, route := range ingressRoute.Spec.Routes {
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if route.Kind != "Rule" {
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logger.Errorf("Unsupported match kind: %s. Only \"Rule\" is supported for now.", route.Kind)
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continue
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}
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if len(route.Match) == 0 {
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logger.Errorf("Empty match rule")
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continue
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}
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if err := checkStringQuoteValidity(route.Match); err != nil {
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logger.Errorf("Invalid syntax for match rule: %s", route.Match)
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continue
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}
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key, err := makeServiceKey(route.Match, ingressName)
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if err != nil {
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logger.Error(err)
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continue
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}
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serviceName := makeID(ingressRoute.Namespace, key)
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for _, service := range route.Services {
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balancerServerHTTP, err := createLoadBalancerServerHTTP(client, ingressRoute.Namespace, service)
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if err != nil {
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logger.
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WithField("serviceName", service.Name).
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WithField("servicePort", service.Port).
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Errorf("Cannot create service: %v", err)
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continue
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}
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// If there is only one service defined, we skip the creation of the load balancer of services,
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// i.e. the service on top is directly a load balancer of servers.
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if len(route.Services) == 1 {
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conf.Services[serviceName] = balancerServerHTTP
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break
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}
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serviceKey := fmt.Sprintf("%s-%s-%d", serviceName, service.Name, service.Port)
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conf.Services[serviceKey] = balancerServerHTTP
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srv := dynamic.WRRService{Name: serviceKey}
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srv.SetDefaults()
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if service.Weight != nil {
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srv.Weight = service.Weight
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}
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if conf.Services[serviceName] == nil {
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conf.Services[serviceName] = &dynamic.Service{Weighted: &dynamic.WeightedRoundRobin{}}
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}
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conf.Services[serviceName].Weighted.Services = append(conf.Services[serviceName].Weighted.Services, srv)
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}
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var mds []string
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for _, mi := range route.Middlewares {
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if strings.Contains(mi.Name, "@") {
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if len(mi.Namespace) > 0 {
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logger.
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WithField(log.MiddlewareName, mi.Name).
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Warnf("namespace %q is ignored in cross-provider context", mi.Namespace)
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}
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mds = append(mds, mi.Name)
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continue
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}
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ns := mi.Namespace
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if len(ns) == 0 {
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ns = ingressRoute.Namespace
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}
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mds = append(mds, makeID(ns, mi.Name))
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}
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conf.Routers[serviceName] = &dynamic.Router{
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Middlewares: mds,
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Priority: route.Priority,
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EntryPoints: ingressRoute.Spec.EntryPoints,
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Rule: route.Match,
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Service: serviceName,
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}
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if ingressRoute.Spec.TLS != nil {
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tlsConf := &dynamic.RouterTLSConfig{
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CertResolver: ingressRoute.Spec.TLS.CertResolver,
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Domains: ingressRoute.Spec.TLS.Domains,
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}
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if ingressRoute.Spec.TLS.Options != nil && len(ingressRoute.Spec.TLS.Options.Name) > 0 {
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tlsOptionsName := ingressRoute.Spec.TLS.Options.Name
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// Is a Kubernetes CRD reference, (i.e. not a cross-provider reference)
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ns := ingressRoute.Spec.TLS.Options.Namespace
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if !strings.Contains(tlsOptionsName, "@") {
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if len(ns) == 0 {
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ns = ingressRoute.Namespace
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}
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tlsOptionsName = makeID(ns, tlsOptionsName)
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} else if len(ns) > 0 {
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logger.
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WithField("TLSoptions", ingressRoute.Spec.TLS.Options.Name).
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Warnf("namespace %q is ignored in cross-provider context", ns)
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}
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tlsConf.Options = tlsOptionsName
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}
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conf.Routers[serviceName].TLS = tlsConf
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}
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}
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}
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return conf
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}
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func createLoadBalancerServerHTTP(client Client, namespace string, service v1alpha1.Service) (*dynamic.Service, error) {
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servers, err := loadServers(client, namespace, service)
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if err != nil {
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return nil, err
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}
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// TODO: support other strategies.
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lb := &dynamic.ServersLoadBalancer{}
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lb.SetDefaults()
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lb.Servers = servers
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lb.PassHostHeader = service.PassHostHeader
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if lb.PassHostHeader == nil {
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passHostHeader := true
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lb.PassHostHeader = &passHostHeader
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}
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lb.ResponseForwarding = service.ResponseForwarding
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return &dynamic.Service{
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LoadBalancer: lb,
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}, nil
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}
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func loadServers(client Client, namespace string, svc v1alpha1.Service) ([]dynamic.Server, error) {
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strategy := svc.Strategy
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if strategy == "" {
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strategy = "RoundRobin"
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}
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if strategy != "RoundRobin" {
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return nil, fmt.Errorf("load balancing strategy %v is not supported", strategy)
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}
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service, exists, err := client.GetService(namespace, svc.Name)
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if err != nil {
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return nil, err
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}
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if !exists {
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return nil, fmt.Errorf("service not found %s/%s", namespace, svc.Name)
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}
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var portSpec *corev1.ServicePort
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for _, p := range service.Spec.Ports {
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if svc.Port == p.Port {
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portSpec = &p
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break
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}
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}
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if portSpec == nil {
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return nil, errors.New("service port not found")
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}
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var servers []dynamic.Server
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if service.Spec.Type == corev1.ServiceTypeExternalName {
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protocol := "http"
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if portSpec.Port == 443 || strings.HasPrefix(portSpec.Name, "https") {
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protocol = "https"
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}
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servers = append(servers, dynamic.Server{
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URL: fmt.Sprintf("%s://%s:%d", protocol, service.Spec.ExternalName, portSpec.Port),
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})
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} else {
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endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, svc.Name)
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if endpointsErr != nil {
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return nil, endpointsErr
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}
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if !endpointsExists {
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return nil, errors.New("endpoints not found")
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}
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if len(endpoints.Subsets) == 0 {
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return nil, errors.New("subset not found")
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}
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var port int32
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for _, subset := range endpoints.Subsets {
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for _, p := range subset.Ports {
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if portSpec.Name == p.Name {
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port = p.Port
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break
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}
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}
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if port == 0 {
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return nil, errors.New("cannot define a port")
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}
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protocol := "http"
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switch svc.Scheme {
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case "http", "https", "h2c":
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protocol = svc.Scheme
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case "":
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if portSpec.Port == 443 || strings.HasPrefix(portSpec.Name, "https") {
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protocol = "https"
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}
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default:
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return nil, fmt.Errorf("invalid scheme %q specified", svc.Scheme)
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}
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for _, addr := range subset.Addresses {
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servers = append(servers, dynamic.Server{
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URL: fmt.Sprintf("%s://%s:%d", protocol, addr.IP, port),
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})
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}
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}
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}
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return servers, nil
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}
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func getTLSHTTP(ctx context.Context, ingressRoute *v1alpha1.IngressRoute, k8sClient Client, tlsConfigs map[string]*tls.CertAndStores) error {
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if ingressRoute.Spec.TLS == nil {
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return nil
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}
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if ingressRoute.Spec.TLS.SecretName == "" {
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log.FromContext(ctx).Debugf("No secret name provided")
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return nil
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}
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configKey := ingressRoute.Namespace + "/" + ingressRoute.Spec.TLS.SecretName
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if _, tlsExists := tlsConfigs[configKey]; !tlsExists {
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tlsConf, err := getTLS(k8sClient, ingressRoute.Spec.TLS.SecretName, ingressRoute.Namespace)
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if err != nil {
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return err
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}
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tlsConfigs[configKey] = tlsConf
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}
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return nil
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}
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