mirror of
https://github.com/kubernetes-sigs/external-dns.git
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5a46584221
Pod source is a key feature of kOps' DNS Controller. Among other things, i is used for etcd and API discovery.
124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
/*
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Copyright 2021 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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"context"
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"fmt"
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"time"
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"sigs.k8s.io/external-dns/endpoint"
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log "github.com/sirupsen/logrus"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/wait"
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kubeinformers "k8s.io/client-go/informers"
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coreinformers "k8s.io/client-go/informers/core/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/cache"
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)
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type podSource struct {
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client kubernetes.Interface
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namespace string
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podInformer coreinformers.PodInformer
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nodeInformer coreinformers.NodeInformer
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}
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// NewPodSource creates a new podSource with the given config.
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func NewPodSource(kubeClient kubernetes.Interface, namespace string) (Source, error) {
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informerFactory := kubeinformers.NewSharedInformerFactoryWithOptions(kubeClient, 0, kubeinformers.WithNamespace(namespace))
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podInformer := informerFactory.Core().V1().Pods()
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nodeInformer := informerFactory.Core().V1().Nodes()
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podInformer.Informer().AddEventHandler(
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cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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},
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},
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)
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nodeInformer.Informer().AddEventHandler(
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cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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},
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},
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)
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informerFactory.Start(wait.NeverStop)
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// wait for the local cache to be populated.
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err := poll(time.Second, 60*time.Second, func() (bool, error) {
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return podInformer.Informer().HasSynced() &&
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nodeInformer.Informer().HasSynced(), nil
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})
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if err != nil {
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return nil, fmt.Errorf("failed to sync cache: %v", err)
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}
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return &podSource{
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client: kubeClient,
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podInformer: podInformer,
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nodeInformer: nodeInformer,
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namespace: namespace,
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}, nil
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}
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func (*podSource) AddEventHandler(ctx context.Context, handler func()) {
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}
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func (ps *podSource) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, error) {
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pods, err := ps.podInformer.Lister().Pods(ps.namespace).List(labels.Everything())
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if err != nil {
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return nil, err
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}
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domains := make(map[string][]string)
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for _, pod := range pods {
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if !pod.Spec.HostNetwork {
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log.Debugf("skipping pod %s. hostNetwork=false", pod.Name)
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continue
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}
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if domain, ok := pod.Annotations[internalHostnameAnnotationKey]; ok {
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if _, ok := domains[domain]; !ok {
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domains[domain] = []string{}
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}
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domains[domain] = append(domains[domain], pod.Status.PodIP)
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}
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if domain, ok := pod.Annotations[hostnameAnnotationKey]; ok {
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if _, ok := domains[domain]; !ok {
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domains[domain] = []string{}
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}
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node, _ := ps.nodeInformer.Lister().Get(pod.Spec.NodeName)
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for _, address := range node.Status.Addresses {
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if address.Type == corev1.NodeExternalIP {
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domains[domain] = append(domains[domain], address.Address)
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}
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}
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}
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}
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endpoints := []*endpoint.Endpoint{}
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for domain, targets := range domains {
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endpoints = append(endpoints, endpoint.NewEndpoint(domain, endpoint.RecordTypeA, targets...))
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}
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return endpoints, nil
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}
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