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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 gc
import (
"sort"
"sync"
"time"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/cache"
"k8s.io/kubernetes/pkg/client/record"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/controller/framework"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/watch"
"github.com/golang/glog"
)
const (
gcCheckPeriod = 20 * time.Second
)
type GCController struct {
kubeClient client.Interface
podStore cache.StoreToPodLister
podStoreSyncer *framework.Controller
deletePod func(namespace, name string) error
threshold int
}
func New(kubeClient client.Interface, resyncPeriod controller.ResyncPeriodFunc, threshold int) *GCController {
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.Infof)
eventBroadcaster.StartRecordingToSink(kubeClient.Events(""))
gcc := &GCController{
kubeClient: kubeClient,
threshold: threshold,
deletePod: func(namespace, name string) error {
return kubeClient.Pods(namespace).Delete(name, api.NewDeleteOptions(0))
},
}
terminatedSelector := compileTerminatedPodSelector()
gcc.podStore.Store, gcc.podStoreSyncer = framework.NewInformer(
&cache.ListWatch{
ListFunc: func() (runtime.Object, error) {
return gcc.kubeClient.Pods(api.NamespaceAll).List(labels.Everything(), terminatedSelector)
},
WatchFunc: func(rv string) (watch.Interface, error) {
return gcc.kubeClient.Pods(api.NamespaceAll).Watch(labels.Everything(), terminatedSelector, rv)
},
},
&api.Pod{},
resyncPeriod(),
framework.ResourceEventHandlerFuncs{},
)
return gcc
}
func (gcc *GCController) Run(stop <-chan struct{}) {
go gcc.podStoreSyncer.Run(stop)
go util.Until(gcc.gc, gcCheckPeriod, stop)
<-stop
}
func (gcc *GCController) gc() {
terminatedPods, _ := gcc.podStore.List(labels.Everything())
terminatedPodCount := len(terminatedPods)
sort.Sort(byCreationTimestamp(terminatedPods))
deleteCount := terminatedPodCount - gcc.threshold
if deleteCount > terminatedPodCount {
deleteCount = terminatedPodCount
}
if deleteCount > 0 {
glog.Infof("garbage collecting %v pods", deleteCount)
}
var wait sync.WaitGroup
for i := 0; i < deleteCount; i++ {
wait.Add(1)
go func(namespace string, name string) {
defer wait.Done()
if err := gcc.deletePod(namespace, name); err != nil {
// ignore not founds
defer util.HandleError(err)
}
}(terminatedPods[i].Namespace, terminatedPods[i].Name)
}
wait.Wait()
}
func compileTerminatedPodSelector() fields.Selector {
selector, err := fields.ParseSelector("status.phase!=" + string(api.PodPending) + ",status.phase!=" + string(api.PodRunning) + ",status.phase!=" + string(api.PodUnknown))
if err != nil {
panic("terminatedSelector must compile: " + err.Error())
}
return selector
}
// byCreationTimestamp sorts a list by creation timestamp, using their names as a tie breaker.
type byCreationTimestamp []*api.Pod
func (o byCreationTimestamp) Len() int { return len(o) }
func (o byCreationTimestamp) Swap(i, j int) { o[i], o[j] = o[j], o[i] }
func (o byCreationTimestamp) Less(i, j int) bool {
if o[i].CreationTimestamp.Equal(o[j].CreationTimestamp) {
return o[i].Name < o[j].Name
}
return o[i].CreationTimestamp.Before(o[j].CreationTimestamp)
}
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