func createStreams(req *http.Request, w http.ResponseWriter, supportedStreamProtocols []string, idleTimeout, streamCreationTimeout time.Duration) (*context, bool) {
opts, err := newOptions(req)
if err != nil {
runtime.HandleError(err)
w.WriteHeader(http.StatusBadRequest)
fmt.Fprint(w, err.Error())
return nil, false
}
if wsstream.IsWebSocketRequest(req) {
return createWebSocketStreams(req, w, opts, idleTimeout)
}
protocol, err := httpstream.Handshake(req, w, supportedStreamProtocols)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprint(w, err.Error())
return nil, false
}
streamCh := make(chan streamAndReply)
upgrader := spdy.NewResponseUpgrader()
conn := upgrader.UpgradeResponse(w, req, func(stream httpstream.Stream, replySent <-chan struct{}) error {
streamCh <- streamAndReply{Stream: stream, replySent: replySent}
return nil
})
// from this point on, we can no longer call methods on response
if conn == nil {
// The upgrader is responsible for notifying the client of any errors that
// occurred during upgrading. All we can do is return here at this point
// if we weren't successful in upgrading.
return nil, false
}
conn.SetIdleTimeout(idleTimeout)
var handler protocolHandler
switch protocol {
case StreamProtocolV2Name:
handler = &v2ProtocolHandler{}
case "":
glog.V(4).Infof("Client did not request protocol negotiaion. Falling back to %q", StreamProtocolV1Name)
fallthrough
case StreamProtocolV1Name:
handler = &v1ProtocolHandler{}
}
expired := time.NewTimer(streamCreationTimeout)
ctx, err := handler.waitForStreams(streamCh, opts.expectedStreams, expired.C)
if err != nil {
runtime.HandleError(err)
return nil, false
}
ctx.conn = conn
ctx.tty = opts.tty
return ctx, true
}
// write renders a returned runtime.Object to the response as a stream or an encoded object. If the object
// returned by the response implements rest.ResourceStreamer that interface will be used to render the
// response. The Accept header and current API version will be passed in, and the output will be copied
// directly to the response body. If content type is returned it is used, otherwise the content type will
// be "application/octet-stream". All other objects are sent to standard JSON serialization.
func write(statusCode int, gv unversioned.GroupVersion, s runtime.NegotiatedSerializer, object runtime.Object, w http.ResponseWriter, req *http.Request) {
if stream, ok := object.(rest.ResourceStreamer); ok {
out, flush, contentType, err := stream.InputStream(gv.String(), req.Header.Get("Accept"))
if err != nil {
errorNegotiated(err, s, gv, w, req)
return
}
if out == nil {
// No output provided - return StatusNoContent
w.WriteHeader(http.StatusNoContent)
return
}
defer out.Close()
if wsstream.IsWebSocketRequest(req) {
r := wsstream.NewReader(out, true)
if err := r.Copy(w, req); err != nil {
utilruntime.HandleError(fmt.Errorf("error encountered while streaming results via websocket: %v", err))
}
return
}
if len(contentType) == 0 {
contentType = "application/octet-stream"
}
w.Header().Set("Content-Type", contentType)
w.WriteHeader(statusCode)
writer := w.(io.Writer)
if flush {
writer = flushwriter.Wrap(w)
}
io.Copy(writer, out)
return
}
writeNegotiated(s, gv, w, req, statusCode, object)
}
// Serve serves a series of encoded events via HTTP with Transfer-Encoding: chunked
// or over a websocket connection.
func (s *WatchServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
w = httplog.Unlogged(w)
if wsstream.IsWebSocketRequest(req) {
w.Header().Set("Content-Type", s.mediaType)
websocket.Handler(s.HandleWS).ServeHTTP(w, req)
return
}
cn, ok := w.(http.CloseNotifier)
if !ok {
err := fmt.Errorf("unable to start watch - can't get http.CloseNotifier: %#v", w)
utilruntime.HandleError(err)
s.scope.err(errors.NewInternalError(err), w, req)
return
}
flusher, ok := w.(http.Flusher)
if !ok {
err := fmt.Errorf("unable to start watch - can't get http.Flusher: %#v", w)
utilruntime.HandleError(err)
s.scope.err(errors.NewInternalError(err), w, req)
return
}
framer := s.framer.NewFrameWriter(w)
if framer == nil {
// programmer error
err := fmt.Errorf("no stream framing support is available for media type %q", s.mediaType)
utilruntime.HandleError(err)
s.scope.err(errors.NewBadRequest(err.Error()), w, req)
return
}
e := streaming.NewEncoder(framer, s.encoder)
// ensure the connection times out
timeoutCh, cleanup := s.t.TimeoutCh()
defer cleanup()
defer s.watching.Stop()
// begin the stream
w.Header().Set("Content-Type", s.mediaType)
w.Header().Set("Transfer-Encoding", "chunked")
w.WriteHeader(http.StatusOK)
flusher.Flush()
var unknown runtime.Unknown
internalEvent := &versioned.InternalEvent{}
buf := &bytes.Buffer{}
ch := s.watching.ResultChan()
for {
select {
case <-cn.CloseNotify():
return
case <-timeoutCh:
return
case event, ok := <-ch:
if !ok {
// End of results.
return
}
obj := event.Object
s.fixup(obj)
if err := s.embeddedEncoder.Encode(obj, buf); err != nil {
// unexpected error
utilruntime.HandleError(fmt.Errorf("unable to encode watch object: %v", err))
return
}
// ContentType is not required here because we are defaulting to the serializer
// type
unknown.Raw = buf.Bytes()
event.Object = &unknown
// the internal event will be versioned by the encoder
*internalEvent = versioned.InternalEvent(event)
if err := e.Encode(internalEvent); err != nil {
utilruntime.HandleError(fmt.Errorf("unable to encode watch object: %v (%#v)", err, e))
// client disconnect.
return
}
if len(ch) == 0 {
flusher.Flush()
}
buf.Reset()
}
}
}