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watch.go
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watch.go
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/*
Copyright 2014 The Kubernetes Authors.
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 handlers
import (
"bytes"
"fmt"
"net/http"
"reflect"
"time"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer/streaming"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
"k8s.io/apiserver/pkg/server/httplog"
"k8s.io/apiserver/pkg/util/wsstream"
"github.com/emicklei/go-restful"
"golang.org/x/net/websocket"
)
// nothing will ever be sent down this channel
var neverExitWatch <-chan time.Time = make(chan time.Time)
// timeoutFactory abstracts watch timeout logic for testing
type TimeoutFactory interface {
TimeoutCh() (<-chan time.Time, func() bool)
}
// realTimeoutFactory implements timeoutFactory
type realTimeoutFactory struct {
timeout time.Duration
}
// TimeoutChan returns a channel which will receive something when the watch times out,
// and a cleanup function to call when this happens.
func (w *realTimeoutFactory) TimeoutCh() (<-chan time.Time, func() bool) {
if w.timeout == 0 {
return neverExitWatch, func() bool { return false }
}
t := time.NewTimer(w.timeout)
return t.C, t.Stop
}
// serveWatch handles serving requests to the server
// TODO: the functionality in this method and in WatchServer.Serve is not cleanly decoupled.
func serveWatch(watcher watch.Interface, scope RequestScope, req *restful.Request, res *restful.Response, timeout time.Duration) {
// negotiate for the stream serializer
serializer, err := negotiation.NegotiateOutputStreamSerializer(req.Request, scope.Serializer)
if err != nil {
scope.err(err, res.ResponseWriter, req.Request)
return
}
framer := serializer.StreamSerializer.Framer
streamSerializer := serializer.StreamSerializer.Serializer
embedded := serializer.Serializer
if framer == nil {
scope.err(fmt.Errorf("no framer defined for %q available for embedded encoding", serializer.MediaType), res.ResponseWriter, req.Request)
return
}
encoder := scope.Serializer.EncoderForVersion(streamSerializer, scope.Kind.GroupVersion())
useTextFraming := serializer.EncodesAsText
// find the embedded serializer matching the media type
embeddedEncoder := scope.Serializer.EncoderForVersion(embedded, scope.Kind.GroupVersion())
// TODO: next step, get back mediaTypeOptions from negotiate and return the exact value here
mediaType := serializer.MediaType
if mediaType != runtime.ContentTypeJSON {
mediaType += ";stream=watch"
}
server := &WatchServer{
Watching: watcher,
Scope: scope,
UseTextFraming: useTextFraming,
MediaType: mediaType,
Framer: framer,
Encoder: encoder,
EmbeddedEncoder: embeddedEncoder,
Fixup: func(obj runtime.Object) {
if err := setSelfLink(obj, req, scope.Namer); err != nil {
utilruntime.HandleError(fmt.Errorf("failed to set link for object %v: %v", reflect.TypeOf(obj), err))
}
},
TimeoutFactory: &realTimeoutFactory{timeout},
}
server.ServeHTTP(res.ResponseWriter, req.Request)
}
// WatchServer serves a watch.Interface over a websocket or vanilla HTTP.
type WatchServer struct {
Watching watch.Interface
Scope RequestScope
// true if websocket messages should use text framing (as opposed to binary framing)
UseTextFraming bool
// the media type this watch is being served with
MediaType string
// used to frame the watch stream
Framer runtime.Framer
// used to encode the watch stream event itself
Encoder runtime.Encoder
// used to encode the nested object in the watch stream
EmbeddedEncoder runtime.Encoder
Fixup func(runtime.Object)
TimeoutFactory TimeoutFactory
}
// ServeHTTP 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.TimeoutFactory.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 := &metav1.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 = metav1.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()
}
}
}
// HandleWS implements a websocket handler.
func (s *WatchServer) HandleWS(ws *websocket.Conn) {
defer ws.Close()
done := make(chan struct{})
go func() {
defer utilruntime.HandleCrash()
// This blocks until the connection is closed.
// Client should not send anything.
wsstream.IgnoreReceives(ws, 0)
// Once the client closes, we should also close
close(done)
}()
var unknown runtime.Unknown
internalEvent := &metav1.InternalEvent{}
buf := &bytes.Buffer{}
streamBuf := &bytes.Buffer{}
ch := s.Watching.ResultChan()
for {
select {
case <-done:
s.Watching.Stop()
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 = metav1.InternalEvent(event)
if err := s.Encoder.Encode(internalEvent, streamBuf); err != nil {
// encoding error
utilruntime.HandleError(fmt.Errorf("unable to encode event: %v", err))
s.Watching.Stop()
return
}
if s.UseTextFraming {
if err := websocket.Message.Send(ws, streamBuf.String()); err != nil {
// Client disconnect.
s.Watching.Stop()
return
}
} else {
if err := websocket.Message.Send(ws, streamBuf.Bytes()); err != nil {
// Client disconnect.
s.Watching.Stop()
return
}
}
buf.Reset()
streamBuf.Reset()
}
}
}