114 lines
2.6 KiB
Go
114 lines
2.6 KiB
Go
/*
|
|
Copyright 2014 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 apiserver
|
|
|
|
import (
|
|
"encoding/json"
|
|
"net/http"
|
|
|
|
"code.google.com/p/go.net/websocket"
|
|
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
|
|
"github.com/GoogleCloudPlatform/kubernetes/pkg/httplog"
|
|
"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
|
|
)
|
|
|
|
// WatchServer serves a watch.Interface over a websocket or vanilla HTTP.
|
|
type WatchServer struct {
|
|
watching watch.Interface
|
|
}
|
|
|
|
// HandleWS implements a websocket handler.
|
|
func (w *WatchServer) HandleWS(ws *websocket.Conn) {
|
|
done := make(chan struct{})
|
|
go func() {
|
|
var unused interface{}
|
|
// Expect this to block until the connection is closed. Client should not
|
|
// send anything.
|
|
websocket.JSON.Receive(ws, &unused)
|
|
close(done)
|
|
}()
|
|
for {
|
|
select {
|
|
case <-done:
|
|
w.watching.Stop()
|
|
return
|
|
case event, ok := <-w.watching.ResultChan():
|
|
if !ok {
|
|
// End of results.
|
|
return
|
|
}
|
|
err := websocket.JSON.Send(ws, &api.WatchEvent{
|
|
Type: event.Type,
|
|
Object: api.APIObject{event.Object},
|
|
})
|
|
if err != nil {
|
|
// Client disconnect.
|
|
w.watching.Stop()
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// ServeHTTP serves a series of JSON encoded events via straight HTTP with
|
|
// Transfer-Encoding: chunked.
|
|
func (self *WatchServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
|
loggedW := httplog.LogOf(w)
|
|
w = httplog.Unlogged(w)
|
|
|
|
cn, ok := w.(http.CloseNotifier)
|
|
if !ok {
|
|
loggedW.Addf("unable to get CloseNotifier")
|
|
http.NotFound(loggedW, req)
|
|
return
|
|
}
|
|
flusher, ok := w.(http.Flusher)
|
|
if !ok {
|
|
loggedW.Addf("unable to get Flusher")
|
|
http.NotFound(loggedW, req)
|
|
return
|
|
}
|
|
|
|
loggedW.Header().Set("Transfer-Encoding", "chunked")
|
|
loggedW.WriteHeader(http.StatusOK)
|
|
flusher.Flush()
|
|
|
|
encoder := json.NewEncoder(w)
|
|
for {
|
|
select {
|
|
case <-cn.CloseNotify():
|
|
self.watching.Stop()
|
|
return
|
|
case event, ok := <-self.watching.ResultChan():
|
|
if !ok {
|
|
// End of results.
|
|
return
|
|
}
|
|
err := encoder.Encode(&api.WatchEvent{
|
|
Type: event.Type,
|
|
Object: api.APIObject{event.Object},
|
|
})
|
|
if err != nil {
|
|
// Client disconnect.
|
|
self.watching.Stop()
|
|
return
|
|
}
|
|
flusher.Flush()
|
|
}
|
|
}
|
|
}
|