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kubernetes_source.go
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kubernetes_source.go
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// Copyright 2015 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 kubernetes
import (
"fmt"
"net/url"
"time"
"github.com/golang/glog"
kubeconfig "k8s.io/heapster/common/kubernetes"
"k8s.io/heapster/events/core"
kubeapi "k8s.io/kubernetes/pkg/api"
kubeapiunv "k8s.io/kubernetes/pkg/api/unversioned"
kubeclient "k8s.io/kubernetes/pkg/client/unversioned"
kubefields "k8s.io/kubernetes/pkg/fields"
kubelabels "k8s.io/kubernetes/pkg/labels"
kubewatch "k8s.io/kubernetes/pkg/watch"
)
const (
// Number of object pointers. Big enough so it won't be hit anytime soon with resonable GetNewEvents frequency.
LocalEventsBufferSize = 100000
)
// Implements core.EventSource interface.
type KubernetesEventSource struct {
// Large local buffer, periodically read.
localEventsBuffer chan *kubeapi.Event
stopChannel chan struct{}
errorChannel chan error
eventClient kubeclient.EventInterface
}
func (this *KubernetesEventSource) GetNewEvents() *core.EventBatch {
result := core.EventBatch{
Timestamp: time.Now(),
Events: []*kubeapi.Event{},
}
// Get all data from the buffer.
event_loop:
for {
select {
case event := <-this.localEventsBuffer:
result.Events = append(result.Events, event)
default:
break event_loop
}
}
return &result
}
func (this *KubernetesEventSource) watch() {
defer close(this.errorChannel)
// Outer loop, for reconnections.
for {
events, err := this.eventClient.List(kubelabels.Everything(), kubefields.Everything())
if err != nil {
glog.Fatalf("Failed to load events: %v", err)
this.errorChannel <- fmt.Errorf("Failed to load events")
return
}
// Do not write old events.
resourceVersion := events.ResourceVersion
watcher, err := this.eventClient.Watch(
kubelabels.Everything(),
kubefields.Everything(),
kubeapi.ListOptions{
LabelSelector: kubelabels.Everything(),
FieldSelector: kubefields.Everything(),
Watch: true,
ResourceVersion: resourceVersion})
if err != nil {
glog.Fatalf("Failed to start watch for new events: %v", err)
this.errorChannel <- fmt.Errorf("Failed to start watch")
return
}
watchChannel := watcher.ResultChan()
// Inner loop, for update processing.
for {
select {
case watchUpdate, ok := <-watchChannel:
if !ok {
glog.Errorf("Event watch channel closed")
break
}
if watchUpdate.Type == kubewatch.Error {
if status, ok := watchUpdate.Object.(*kubeapiunv.Status); ok {
glog.Errorf("Error during watch: %#v", status)
break
}
glog.Errorf("Received unexpected error: %#v", watchUpdate.Object)
break
}
if event, ok := watchUpdate.Object.(*kubeapi.Event); ok {
switch watchUpdate.Type {
case kubewatch.Added, kubewatch.Modified:
select {
case this.localEventsBuffer <- event:
// Ok, buffer not full.
default:
// Buffer full, need to drop the event.
glog.Errorf("Event buffer full, dropping event")
}
case kubewatch.Deleted:
// Deleted events are silently ignored.
default:
glog.Warningf("Unknown watchUpdate.Type: %#v", watchUpdate.Type)
}
} else {
glog.Fatalf("Wrong object received: %v", watchUpdate)
}
case <-this.stopChannel:
glog.Infof("Event watching stopped")
return
}
}
}
}
func NewKubernetesSource(uri *url.URL) (*KubernetesEventSource, error) {
kubeConfig, err := kubeconfig.GetKubeClientConfig(uri)
if err != nil {
return nil, err
}
kubeClient, err := kubeclient.New(kubeConfig)
if err != nil {
return nil, err
}
eventClient := kubeClient.Events(kubeapi.NamespaceAll)
result := KubernetesEventSource{
localEventsBuffer: make(chan *kubeapi.Event, LocalEventsBufferSize),
stopChannel: make(chan struct{}),
errorChannel: make(chan error, 1),
eventClient: eventClient,
}
go result.watch()
return &result, nil
}