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/
cache.go
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/
cache.go
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// Copyright 2017 Istio 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 kube
import (
"fmt"
"log"
"sync"
"k8s.io/api/core/v1"
"k8s.io/client-go/tools/cache"
"istio.io/istio/pilot/pkg/model"
)
// PodCache is an eventually consistent pod cache
// TODO: rename the file to 'pod.go' (cache is too generic)
type PodCache struct {
rwMu sync.RWMutex
cacheHandler
// keys maintains stable pod IP to name key mapping
// this allows us to retrieve the latest status by pod IP.
// This should only contain RUNNING or PENDING pods with an allocated IP.
keys map[string]string
}
func newPodCache(ch cacheHandler) *PodCache {
out := &PodCache{
cacheHandler: ch,
keys: make(map[string]string),
}
ch.handler.Append(func(obj interface{}, ev model.Event) error {
out.rwMu.Lock()
defer out.rwMu.Unlock()
// When a pod is deleted obj could be an *v1.Pod or a DeletionFinalStateUnknown marker item.
pod, ok := obj.(*v1.Pod)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
return fmt.Errorf("couldn't get object from tombstone %+v", obj)
}
pod, ok = tombstone.Obj.(*v1.Pod)
if !ok {
return fmt.Errorf("tombstone contained object that is not a pod %#v", obj)
}
}
ip := pod.Status.PodIP
log.Printf("Handling event %s for pod %s in namespace %s -> %v", ev, pod.Name, pod.Namespace, ip)
if len(ip) > 0 {
key := KeyFunc(pod.Name, pod.Namespace)
switch ev {
case model.EventAdd:
switch pod.Status.Phase {
case v1.PodPending, v1.PodRunning:
// add to cache if the pod is running or pending
out.keys[ip] = key
}
case model.EventUpdate:
switch pod.Status.Phase {
case v1.PodPending, v1.PodRunning:
// add to cache if the pod is running or pending
out.keys[ip] = key
default:
// delete if the pod switched to other states and is in the cache
if out.keys[ip] == key {
delete(out.keys, ip)
}
}
case model.EventDelete:
// delete only if this pod was in the cache
if out.keys[ip] == key {
delete(out.keys, ip)
}
}
}
return nil
})
return out
}
func (pc *PodCache) getPodKey(addr string) (string, bool) {
pc.rwMu.RLock()
defer pc.rwMu.RUnlock()
key, exists := pc.keys[addr]
return key, exists
}
// getPodByIp returns the pod or nil if pod not found or an error occurred
func (pc *PodCache) getPodByIP(addr string) (*v1.Pod, bool) {
pc.rwMu.RLock()
defer pc.rwMu.RUnlock()
key, exists := pc.keys[addr]
if !exists {
return nil, false
}
item, exists, err := pc.informer.GetStore().GetByKey(key)
if !exists || err != nil {
return nil, false
}
return item.(*v1.Pod), true
}
// labelsByIP returns pod labels or nil if pod not found or an error occurred
func (pc *PodCache) labelsByIP(addr string) (model.Labels, bool) {
pod, exists := pc.getPodByIP(addr)
if !exists {
return nil, false
}
return convertLabels(pod.ObjectMeta), true
}