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rkt.go
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rkt.go
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// Copyright 2016 Google Inc. 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 rkt implements the watcher interface for rkt
package rkt
import (
"path/filepath"
"time"
"github.com/google/cadvisor/container/rkt"
"github.com/google/cadvisor/manager/watcher"
rktapi "github.com/coreos/rkt/api/v1alpha"
"github.com/golang/glog"
"golang.org/x/net/context"
)
type rktContainerWatcher struct {
// Signal for watcher thread to stop.
stopWatcher chan error
}
func NewRktContainerWatcher() (watcher.ContainerWatcher, error) {
watcher := &rktContainerWatcher{
stopWatcher: make(chan error),
}
return watcher, nil
}
func (self *rktContainerWatcher) Start(events chan watcher.ContainerEvent) error {
go self.detectRktContainers(events)
return nil
}
func (self *rktContainerWatcher) Stop() error {
// Rendezvous with the watcher thread.
self.stopWatcher <- nil
return nil
}
func (self *rktContainerWatcher) detectRktContainers(events chan watcher.ContainerEvent) {
glog.Infof("starting detectRktContainers thread")
ticker := time.Tick(10 * time.Second)
curpods := make(map[string]*rktapi.Pod)
for {
select {
case <-ticker:
pods, err := listRunningPods()
if err != nil {
glog.Errorf("detectRktContainers: listRunningPods failed: %v", err)
continue
}
curpods = self.syncRunningPods(pods, events, curpods)
case <-self.stopWatcher:
glog.Infof("Exiting rktContainer Thread")
return
}
}
}
func (self *rktContainerWatcher) syncRunningPods(pods []*rktapi.Pod, events chan watcher.ContainerEvent, curpods map[string]*rktapi.Pod) map[string]*rktapi.Pod {
newpods := make(map[string]*rktapi.Pod)
for _, pod := range pods {
newpods[pod.Id] = pod
// if pods become mutable, have to handle this better
if _, ok := curpods[pod.Id]; !ok {
// should create all cgroups not including system.slice
// i.e. /system.slice/rkt-test.service and /system.slice/rkt-test.service/system.slice/pause.service
for _, cgroup := range podToCgroup(pod) {
self.sendUpdateEvent(cgroup, events)
}
}
}
for id, pod := range curpods {
if _, ok := newpods[id]; !ok {
for _, cgroup := range podToCgroup(pod) {
glog.Infof("cgroup to delete = %v", cgroup)
self.sendDestroyEvent(cgroup, events)
}
}
}
return newpods
}
func (self *rktContainerWatcher) sendUpdateEvent(cgroup string, events chan watcher.ContainerEvent) {
events <- watcher.ContainerEvent{
EventType: watcher.ContainerAdd,
Name: cgroup,
WatchSource: watcher.Rkt,
}
}
func (self *rktContainerWatcher) sendDestroyEvent(cgroup string, events chan watcher.ContainerEvent) {
events <- watcher.ContainerEvent{
EventType: watcher.ContainerDelete,
Name: cgroup,
WatchSource: watcher.Rkt,
}
}
func listRunningPods() ([]*rktapi.Pod, error) {
client, err := rkt.Client()
if err != nil {
return nil, err
}
resp, err := client.ListPods(context.Background(), &rktapi.ListPodsRequest{
// Specify the request: Fetch and print only running pods and their details.
Detail: true,
Filters: []*rktapi.PodFilter{
{
States: []rktapi.PodState{rktapi.PodState_POD_STATE_RUNNING},
},
},
})
if err != nil {
return nil, err
}
return resp.Pods, nil
}
func podToCgroup(pod *rktapi.Pod) []string {
cgroups := make([]string, 1+len(pod.Apps), 1+len(pod.Apps))
baseCgroup := pod.Cgroup
cgroups[0] = baseCgroup
for i, app := range pod.Apps {
cgroups[i+1] = filepath.Join(baseCgroup, "system.slice", app.Name+".service")
}
return cgroups
}