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cache.go
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cache.go
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// Copyright 2021 Antrea Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http:// www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cnipodcache
import (
"sync"
"k8s.io/client-go/tools/cache"
"antrea.io/antrea/pkg/agent/util"
"antrea.io/antrea/pkg/util/k8s"
)
const (
podIndex = "pod"
)
type CNIPodInfoCache struct {
// Mutex to protect CNIConfigInfo.PodCNIDeleted which is written by CNIServer, and read by
// the secondary network Pod controller.
sync.RWMutex
cache cache.Indexer
}
// Add CNIPodInfo to local cache store.
func (c *CNIPodInfoCache) AddCNIConfigInfo(CNIConfig *CNIConfigInfo) {
c.cache.Add(CNIConfig)
}
// Delete CNIPodInfo from local cache store.
func (c *CNIPodInfoCache) DeleteCNIConfigInfo(CNIConfig *CNIConfigInfo) {
c.cache.Delete(CNIConfig)
}
func (c *CNIPodInfoCache) SetPodCNIDeleted(CNIConfig *CNIConfigInfo) {
c.Lock()
defer c.Unlock()
CNIConfig.PodCNIDeleted = true
}
// Retrieve a valid CNI cache (PodCNIDeleted is not true) entry for the given Pod name and namespace.
func (c *CNIPodInfoCache) GetValidCNIConfigInfoPerPod(podName, podNamespace string) *CNIConfigInfo {
podObjs, _ := c.cache.ByIndex(podIndex, k8s.NamespacedName(podNamespace, podName))
c.RLock()
defer c.RUnlock()
for i := range podObjs {
var cniPodConfig *CNIConfigInfo
cniPodConfig = podObjs[i].(*CNIConfigInfo)
if cniPodConfig.PodCNIDeleted != true {
return cniPodConfig
}
}
return nil
}
// Retrieve all CNIConfigInfo from cacheStore for the given podName and its Namespace
// NOTE: In an ideal scenario, there should be one cache entry per Pod name and namespace.
func (c *CNIPodInfoCache) GetAllCNIConfigInfoPerPod(podName, podNamespace string) []*CNIConfigInfo {
podObjs, _ := c.cache.ByIndex(podIndex, k8s.NamespacedName(podNamespace, podName))
CNIPodConfigs := make([]*CNIConfigInfo, len(podObjs))
for i := range podObjs {
CNIPodConfigs[i] = podObjs[i].(*CNIConfigInfo)
}
return CNIPodConfigs
}
func (c *CNIPodInfoCache) GetCNIConfigInfoByContainerID(podName, podNamespace, containerID string) *CNIConfigInfo {
podObjs, _ := c.cache.ByIndex(podIndex, k8s.NamespacedName(podNamespace, podName))
for i := range podObjs {
var cniPodConfig *CNIConfigInfo
cniPodConfig = podObjs[i].(*CNIConfigInfo)
if cniPodConfig.ContainerID == containerID {
return cniPodConfig
}
}
return nil
}
func podIndexFunc(obj interface{}) ([]string, error) {
podConfig := obj.(*CNIConfigInfo)
return []string{k8s.NamespacedName(podConfig.PodNameSpace, podConfig.PodName)}, nil
}
func getCNIPodInfoKey(obj interface{}) (string, error) {
podConfig := obj.(*CNIConfigInfo)
var key string
key = util.GenerateContainerInterfaceKey(podConfig.ContainerID)
return key, nil
}
func NewCNIPodInfoStore() *CNIPodInfoCache {
return &CNIPodInfoCache{
cache: cache.NewIndexer(getCNIPodInfoKey, cache.Indexers{
podIndex: podIndexFunc,
}),
}
}