mirror of
https://github.com/kubernetes-sigs/external-dns.git
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* chore: update and vendor all dependencies * chore: don't forget custom import repo-infra
159 lines
4.9 KiB
Go
159 lines
4.9 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package source
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import (
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"bytes"
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"fmt"
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"strings"
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"text/template"
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log "github.com/Sirupsen/logrus"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/pkg/api/v1"
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"github.com/kubernetes-incubator/external-dns/endpoint"
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)
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// serviceSource is an implementation of Source for Kubernetes service objects.
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// It will find all services that are under our jurisdiction, i.e. annotated
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// desired hostname and matching or no controller annotation. For each of the
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// matched services' external entrypoints it will return a corresponding
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// Endpoint object.
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type serviceSource struct {
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client kubernetes.Interface
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namespace string
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// process Services with legacy annotations
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compatibility string
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fqdntemplate *template.Template
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}
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// NewServiceSource creates a new serviceSource with the given client and namespace scope.
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func NewServiceSource(client kubernetes.Interface, namespace, fqdntemplate string, compatibility string) (Source, error) {
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var tmpl *template.Template
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var err error
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if fqdntemplate != "" {
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tmpl, err = template.New("endpoint").Funcs(template.FuncMap{
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"trimPrefix": strings.TrimPrefix,
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}).Parse(fqdntemplate)
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if err != nil {
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return nil, err
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}
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}
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return &serviceSource{
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client: client,
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namespace: namespace,
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compatibility: compatibility,
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fqdntemplate: tmpl,
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}, nil
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}
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// Endpoints returns endpoint objects for each service that should be processed.
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func (sc *serviceSource) Endpoints() ([]*endpoint.Endpoint, error) {
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services, err := sc.client.CoreV1().Services(sc.namespace).List(metav1.ListOptions{})
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if err != nil {
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return nil, err
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}
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endpoints := []*endpoint.Endpoint{}
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for _, svc := range services.Items {
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// Check controller annotation to see if we are responsible.
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controller, ok := svc.Annotations[controllerAnnotationKey]
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if ok && controller != controllerAnnotationValue {
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log.Debugf("Skipping service %s/%s because controller value does not match, found: %s, required: %s",
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svc.Namespace, svc.Name, controller, controllerAnnotationValue)
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continue
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}
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svcEndpoints := endpointsFromService(&svc)
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// process legacy annotations if no endpoints were returned and compatibility mode is enabled.
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if len(svcEndpoints) == 0 && sc.compatibility != "" {
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svcEndpoints = legacyEndpointsFromService(&svc, sc.compatibility)
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}
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// apply template if none of the above is found
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if len(svcEndpoints) == 0 && sc.fqdntemplate != nil {
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svcEndpoints, err = sc.endpointsFromTemplate(&svc)
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if err != nil {
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return nil, err
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}
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}
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if len(svcEndpoints) == 0 {
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log.Debugf("No endpoints could be generated from service %s/%s", svc.Namespace, svc.Name)
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continue
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}
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log.Debugf("Endpoints generated from service: %s/%s: %v", svc.Namespace, svc.Name, svcEndpoints)
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endpoints = append(endpoints, svcEndpoints...)
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}
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return endpoints, nil
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}
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func (sc *serviceSource) endpointsFromTemplate(svc *v1.Service) ([]*endpoint.Endpoint, error) {
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var endpoints []*endpoint.Endpoint
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var buf bytes.Buffer
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err := sc.fqdntemplate.Execute(&buf, svc)
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if err != nil {
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return nil, fmt.Errorf("failed to apply template on service %s: %v", svc.String(), err)
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}
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hostname := buf.String()
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for _, lb := range svc.Status.LoadBalancer.Ingress {
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if lb.IP != "" {
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//TODO(ideahitme): consider retrieving record type from resource annotation instead of empty
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endpoints = append(endpoints, endpoint.NewEndpoint(hostname, lb.IP, ""))
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}
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if lb.Hostname != "" {
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endpoints = append(endpoints, endpoint.NewEndpoint(hostname, lb.Hostname, ""))
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}
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}
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return endpoints, nil
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}
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// endpointsFromService extracts the endpoints from a service object
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func endpointsFromService(svc *v1.Service) []*endpoint.Endpoint {
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var endpoints []*endpoint.Endpoint
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// Get the desired hostname of the service from the annotation.
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hostname, exists := svc.Annotations[hostnameAnnotationKey]
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if !exists {
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return nil
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}
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// Create a corresponding endpoint for each configured external entrypoint.
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for _, lb := range svc.Status.LoadBalancer.Ingress {
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if lb.IP != "" {
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//TODO(ideahitme): consider retrieving record type from resource annotation instead of empty
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endpoints = append(endpoints, endpoint.NewEndpoint(hostname, lb.IP, ""))
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}
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if lb.Hostname != "" {
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endpoints = append(endpoints, endpoint.NewEndpoint(hostname, lb.Hostname, ""))
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}
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}
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return endpoints
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}
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