mirror of https://github.com/k3s-io/k3s
132 lines
4.0 KiB
Go
132 lines
4.0 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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package kubelet
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import (
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"fmt"
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"reflect"
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"sync"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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kubecontainer "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/golang/glog"
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)
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type podStatusSyncRequest struct {
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pod *api.Pod
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status api.PodStatus
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}
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// Updates pod statuses in apiserver. Writes only when new status has changed.
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// All methods are thread-safe.
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type statusManager struct {
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kubeClient client.Interface
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// Map from pod full name to sync status of the corresponding pod.
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podStatusesLock sync.RWMutex
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podStatuses map[string]api.PodStatus
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podStatusChannel chan podStatusSyncRequest
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}
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func newStatusManager(kubeClient client.Interface) *statusManager {
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return &statusManager{
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kubeClient: kubeClient,
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podStatuses: make(map[string]api.PodStatus),
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podStatusChannel: make(chan podStatusSyncRequest, 1000), // Buffer up to 1000 statuses
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}
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}
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func (s *statusManager) Start() {
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// syncBatch blocks when no updates are available, we can run it in a tight loop.
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go util.Forever(func() {
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err := s.syncBatch()
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if err != nil {
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glog.Warningf("Failed to updated pod status: %v", err)
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}
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}, 0)
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}
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func (s *statusManager) GetPodStatus(podFullName string) (api.PodStatus, bool) {
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s.podStatusesLock.RLock()
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defer s.podStatusesLock.RUnlock()
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status, ok := s.podStatuses[podFullName]
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return status, ok
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}
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func (s *statusManager) SetPodStatus(pod *api.Pod, status api.PodStatus) {
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podFullName := kubecontainer.GetPodFullName(pod)
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s.podStatusesLock.Lock()
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defer s.podStatusesLock.Unlock()
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oldStatus, found := s.podStatuses[podFullName]
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if !found || !reflect.DeepEqual(oldStatus, status) {
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s.podStatuses[podFullName] = status
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s.podStatusChannel <- podStatusSyncRequest{pod, status}
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} else {
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glog.V(3).Infof("Ignoring same pod status for %s - old: %s new: %s", podFullName, oldStatus, status)
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}
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}
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func (s *statusManager) DeletePodStatus(podFullName string) {
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s.podStatusesLock.Lock()
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defer s.podStatusesLock.Unlock()
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delete(s.podStatuses, podFullName)
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}
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// TODO(filipg): It'd be cleaner if we can do this without signal from user.
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func (s *statusManager) RemoveOrphanedStatuses(podFullNames map[string]bool) {
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s.podStatusesLock.Lock()
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defer s.podStatusesLock.Unlock()
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for key := range s.podStatuses {
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if _, ok := podFullNames[key]; !ok {
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glog.V(5).Infof("Removing %q from status map.", key)
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delete(s.podStatuses, key)
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}
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}
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}
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// syncBatch syncs pods statuses with the apiserver.
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func (s *statusManager) syncBatch() error {
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syncRequest := <-s.podStatusChannel
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pod := syncRequest.pod
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podFullName := kubecontainer.GetPodFullName(pod)
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status := syncRequest.status
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var err error
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statusPod := &api.Pod{
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ObjectMeta: pod.ObjectMeta,
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}
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// TODO: make me easier to express from client code
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if statusPod, err = s.kubeClient.Pods(statusPod.Namespace).Get(statusPod.Name); err == nil {
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statusPod.Status = status
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}
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if err == nil {
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statusPod, err = s.kubeClient.Pods(pod.Namespace).UpdateStatus(statusPod)
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// TODO: handle conflict as a retry, make that easier too.
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}
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if err != nil {
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// We failed to update status. In order to make sure we retry next time
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// we delete cached value. This may result in an additional update, but
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// this is ok.
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s.DeletePodStatus(podFullName)
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return fmt.Errorf("error updating status for pod %q: %v", pod.Name, err)
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}
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glog.V(3).Infof("Status for pod %q updated successfully", pod.Name)
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return nil
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}
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