mirror of https://github.com/k3s-io/k3s
92 lines
2.5 KiB
Go
92 lines
2.5 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 master
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import (
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"log"
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"sync"
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/registry"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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)
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// PodCache contains both a cache of container information, as well as the mechanism for keeping
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// that cache up to date.
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type PodCache struct {
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containerInfo client.ContainerInfo
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pods registry.PodRegistry
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podInfo map[string]interface{}
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period time.Duration
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podLock sync.Mutex
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}
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func NewPodCache(info client.ContainerInfo, pods registry.PodRegistry, period time.Duration) *PodCache {
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return &PodCache{
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containerInfo: info,
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pods: pods,
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podInfo: map[string]interface{}{},
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period: period,
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}
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}
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// Implements the ContainerInfo interface
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// The returned value should be treated as read-only
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func (p *PodCache) GetContainerInfo(host, id string) (interface{}, error) {
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p.podLock.Lock()
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defer p.podLock.Unlock()
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value, ok := p.podInfo[id]
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if !ok {
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return nil, nil
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} else {
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return value, nil
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}
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}
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func (p *PodCache) updateContainerInfo(host, id string) error {
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info, err := p.containerInfo.GetContainerInfo(host, id)
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if err != nil {
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return err
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}
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p.podLock.Lock()
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defer p.podLock.Unlock()
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p.podInfo[id] = info
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return nil
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}
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// Update information about all containers. Either called by Loop() below, or one-off.
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func (p *PodCache) UpdateAllContainers() {
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pods, err := p.pods.ListPods(labels.Everything())
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if err != nil {
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log.Printf("Error synchronizing container: %#v", err)
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return
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}
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for _, pod := range pods {
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err := p.updateContainerInfo(pod.CurrentState.Host, pod.ID)
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if err != nil {
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log.Printf("Error synchronizing container: %#v", err)
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}
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}
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}
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// Loop runs forever, it is expected to be placed in a go routine.
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func (p *PodCache) Loop() {
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util.Forever(func() { p.UpdateAllContainers() }, p.period)
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}
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