func watchBody(codec runtime.Codec, events []watch.Event) io.ReadCloser {
buf := bytes.NewBuffer([]byte{})
enc := versioned.NewEncoder(streaming.NewEncoder(buf, codec), codec)
for i := range events {
enc.Encode(&events[i])
}
return json.Framer.NewFrameReader(ioutil.NopCloser(buf))
}
func watchBody(events ...watch.Event) string {
buf := &bytes.Buffer{}
codec := testapi.Default.Codec()
enc := versioned.NewEncoder(streaming.NewEncoder(buf, codec), codec)
for _, e := range events {
enc.Encode(&e)
}
return buf.String()
}
func TestWatch(t *testing.T) {
var table = []struct {
t watch.EventType
obj runtime.Object
}{
{watch.Added, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "first"}}},
{watch.Modified, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "second"}}},
{watch.Deleted, &api.Pod{ObjectMeta: api.ObjectMeta{Name: "last"}}},
}
testServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
flusher, ok := w.(http.Flusher)
if !ok {
panic("need flusher!")
}
w.Header().Set("Transfer-Encoding", "chunked")
w.WriteHeader(http.StatusOK)
flusher.Flush()
encoder := versioned.NewEncoder(streaming.NewEncoder(w, testapi.Default.Codec()), testapi.Default.Codec())
for _, item := range table {
if err := encoder.Encode(&watch.Event{Type: item.t, Object: item.obj}); err != nil {
panic(err)
}
flusher.Flush()
}
}))
defer testServer.Close()
s := testRESTClient(t, testServer)
watching, err := s.Get().Prefix("path/to/watch/thing").Watch()
if err != nil {
t.Fatalf("Unexpected error")
}
for _, item := range table {
got, ok := <-watching.ResultChan()
if !ok {
t.Fatalf("Unexpected early close")
}
if e, a := item.t, got.Type; e != a {
t.Errorf("Expected %v, got %v", e, a)
}
if e, a := item.obj, got.Object; !api.Semantic.DeepDerivative(e, a) {
t.Errorf("Expected %v, got %v", e, a)
}
}
_, ok := <-watching.ResultChan()
if ok {
t.Fatal("Unexpected non-close")
}
}
func TestEncodeDecodeRoundTrip(t *testing.T) {
testCases := []struct {
Type watch.EventType
Object runtime.Object
Codec runtime.Codec
}{
{
watch.Added,
&api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}},
testapi.Default.Codec(),
},
{
watch.Modified,
&api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}},
testapi.Default.Codec(),
},
{
watch.Deleted,
&api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}},
testapi.Default.Codec(),
},
}
for i, testCase := range testCases {
buf := &bytes.Buffer{}
codec := testCase.Codec
encoder := versioned.NewEncoder(streaming.NewEncoder(buf, codec), codec)
if err := encoder.Encode(&watch.Event{Type: testCase.Type, Object: testCase.Object}); err != nil {
t.Errorf("%d: unexpected error: %v", i, err)
continue
}
rc := ioutil.NopCloser(buf)
decoder := versioned.NewDecoder(streaming.NewDecoder(rc, codec), codec)
event, obj, err := decoder.Decode()
if err != nil {
t.Errorf("%d: unexpected error: %v", i, err)
continue
}
if !api.Semantic.DeepDerivative(testCase.Object, obj) {
t.Errorf("%d: expected %#v, got %#v", i, testCase.Object, obj)
}
if event != testCase.Type {
t.Errorf("%d: unexpected type: %#v", i, event)
}
}
}
func TestWatch(t *testing.T) {
tcs := []struct {
name string
namespace string
events []watch.Event
path string
}{
{
name: "normal_watch",
path: "/api/gtest/vtest/watch/rtest",
events: []watch.Event{
{Type: watch.Added, Object: getObject("vTest", "rTest", "normal_watch")},
{Type: watch.Modified, Object: getObject("vTest", "rTest", "normal_watch")},
{Type: watch.Deleted, Object: getObject("vTest", "rTest", "normal_watch")},
},
},
{
name: "namespaced_watch",
namespace: "nstest",
path: "/api/gtest/vtest/watch/namespaces/nstest/rtest",
events: []watch.Event{
{Type: watch.Added, Object: getObject("vTest", "rTest", "namespaced_watch")},
{Type: watch.Modified, Object: getObject("vTest", "rTest", "namespaced_watch")},
{Type: watch.Deleted, Object: getObject("vTest", "rTest", "namespaced_watch")},
},
},
}
for _, tc := range tcs {
gv := &unversioned.GroupVersion{Group: "gtest", Version: "vtest"}
resource := &unversioned.APIResource{Name: "rtest", Namespaced: len(tc.namespace) != 0}
cl, srv, err := getClientServer(gv, func(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
t.Errorf("Watch(%q) got HTTP method %s. wanted GET", tc.name, r.Method)
}
if r.URL.Path != tc.path {
t.Errorf("Watch(%q) got path %s. wanted %s", tc.name, r.URL.Path, tc.path)
}
enc := versioned.NewEncoder(streaming.NewEncoder(w, dynamicCodec{}), dynamicCodec{})
for _, e := range tc.events {
enc.Encode(&e)
}
})
if err != nil {
t.Errorf("unexpected error when creating client: %v", err)
continue
}
defer srv.Close()
watcher, err := cl.Resource(resource, tc.namespace).Watch(&v1.ListOptions{})
if err != nil {
t.Errorf("unexpected error when watching %q: %v", tc.name, err)
continue
}
for _, want := range tc.events {
got := <-watcher.ResultChan()
if !reflect.DeepEqual(got, want) {
t.Errorf("Watch(%q) want: %v\ngot: %v", tc.name, want, got)
}
}
}
}
// 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.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()
}
}
}