905514a12b
Make all kubelet config sources ensure that UID and Namespace are defaulted, if need be. We can *almost* disable the "if blank" logic for UID, except for tests that call APIs that do not run through SyncPods. We really ought to be enforcing invariants better.
117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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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// Reads the pod configuration from etcd using the Kubernetes etcd schema.
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package config
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import (
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"errors"
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"path"
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/tools"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
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"github.com/golang/glog"
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)
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func EtcdKeyForHost(hostname string) string {
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return path.Join("/", "registry", "nodes", hostname, "boundpods")
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}
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type sourceEtcd struct {
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key string
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helper tools.EtcdHelper
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updates chan<- interface{}
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}
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// NewSourceEtcd creates a config source that watches and pulls from a key in etcd
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func NewSourceEtcd(key string, client tools.EtcdClient, updates chan<- interface{}) {
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helper := tools.EtcdHelper{
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client,
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latest.Codec,
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tools.RuntimeVersionAdapter{latest.ResourceVersioner},
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}
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source := &sourceEtcd{
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key: key,
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helper: helper,
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updates: updates,
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}
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glog.V(1).Infof("Watching etcd for %s", key)
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go util.Forever(source.run, time.Second)
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}
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func (s *sourceEtcd) run() {
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boundPods := api.BoundPods{}
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err := s.helper.ExtractToList(s.key, &boundPods)
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if err != nil {
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glog.Errorf("etcd failed to retrieve the value for the key %q. Error: %v", s.key, err)
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return
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}
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// Push update. Maybe an empty PodList to allow EtcdSource to be marked as seen
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s.updates <- kubelet.PodUpdate{boundPods.Items, kubelet.SET, kubelet.EtcdSource}
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index, _ := s.helper.ResourceVersioner.ResourceVersion(&boundPods)
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watching := s.helper.Watch(s.key, index)
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for {
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select {
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case event, ok := <-watching.ResultChan():
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if !ok {
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return
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}
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if event.Type == watch.Error {
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glog.Infof("Watch closed (%#v). Reopening.", event.Object)
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watching.Stop()
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return
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}
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pods, err := eventToPods(event)
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if err != nil {
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glog.Errorf("Failed to parse result from etcd watch: %v", err)
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continue
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}
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glog.V(4).Infof("Received state from etcd watch: %+v", pods)
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s.updates <- kubelet.PodUpdate{pods, kubelet.SET, kubelet.EtcdSource}
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}
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}
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}
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// eventToPods takes a watch.Event object, and turns it into a structured list of pods.
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// It returns a list of containers, or an error if one occurs.
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func eventToPods(ev watch.Event) ([]api.BoundPod, error) {
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pods := []api.BoundPod{}
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if ev.Object == nil {
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return pods, nil
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}
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boundPods, ok := ev.Object.(*api.BoundPods)
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if !ok {
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return pods, errors.New("unable to parse response as BoundPods")
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}
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for _, pod := range boundPods.Items {
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// Backwards compatibility with old api servers
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// TODO: Remove this after 1.0 release.
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if len(pod.Namespace) == 0 {
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pod.Namespace = api.NamespaceDefault
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}
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pods = append(pods, pod)
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}
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return pods, nil
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}
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