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https://github.com/kubernetes-sigs/external-dns.git
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c3378f7f67
* ref(source): use constructor methods to create sources * fix: import and use missing package * fix(source): fix merge conflict with master branch
103 lines
3.1 KiB
Go
103 lines
3.1 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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"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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const (
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// The annotation used for figuring out which controller is responsible
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controllerAnnotationKey = "external-dns.alpha.kubernetes.io/controller"
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// The annotation used for defining the desired hostname
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hostnameAnnotationKey = "external-dns.alpha.kubernetes.io/hostname"
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// The value of the controller annotation so that we feel resposible
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controllerAnnotationValue = "dns-controller"
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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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}
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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 string) Source {
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return &serviceSource{client: client, namespace: namespace}
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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(v1.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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svcEndpoints := endpointsFromService(&svc)
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if len(svcEndpoints) != 0 {
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endpoints = append(endpoints, svcEndpoints...)
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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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// Check controller annotation to see if we are responsible.
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controller, exists := svc.Annotations[controllerAnnotationKey]
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if exists && controller != controllerAnnotationValue {
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return endpoints
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}
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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 endpoints
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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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endpoints = append(endpoints, endpoint.Endpoint{
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DNSName: hostname,
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Target: lb.IP,
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})
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}
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if lb.Hostname != "" {
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endpoints = append(endpoints, endpoint.Endpoint{
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DNSName: hostname,
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Target: lb.Hostname,
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})
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}
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}
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return endpoints
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}
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