Allow clients to determine the difference between create or update on PUT

PUT allows an object to be created (http 201).  This allows REST code to
indicate an object has been created and clients to react to it.

APIServer now deals with <-chan RESTResult instead of <-chan runtime.Object,
allowing more data to be passed through.

pkg/apiserver/operation.go

@@ -53,7 +53,8 @@ func (h *OperationHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	obj, complete := op.StatusOrResult()
+	result, complete := op.StatusOrResult()
+	obj := result.Object
 	if complete {
 		writeJSON(http.StatusOK, h.codec, obj, w)
 	} else {
@@ -64,9 +65,9 @@ func (h *OperationHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 // Operation represents an ongoing action which the server is performing.
 type Operation struct {
 	ID        string
-	result    runtime.Object
-	onReceive func(runtime.Object)
-	awaiting  <-chan runtime.Object
+	result    RESTResult
+	onReceive func(RESTResult)
+	awaiting  <-chan RESTResult
 	finished  *time.Time
 	lock      sync.Mutex
 	notify    chan struct{}
@@ -93,7 +94,7 @@ func NewOperations() *Operations {
 
 // NewOperation adds a new operation. It is lock-free. 'onReceive' will be called
 // with the value read from 'from', when it is read.
-func (ops *Operations) NewOperation(from <-chan runtime.Object, onReceive func(runtime.Object)) *Operation {
+func (ops *Operations) NewOperation(from <-chan RESTResult, onReceive func(RESTResult)) *Operation {
 	id := atomic.AddInt64(&ops.lastID, 1)
 	op := &Operation{
 		ID:        strconv.FormatInt(id, 10),
@@ -192,16 +193,16 @@ func (op *Operation) expired(limitTime time.Time) bool {
 
 // StatusOrResult returns status information or the result of the operation if it is complete,
 // with a bool indicating true in the latter case.
-func (op *Operation) StatusOrResult() (description runtime.Object, finished bool) {
+func (op *Operation) StatusOrResult() (description RESTResult, finished bool) {
 	op.lock.Lock()
 	defer op.lock.Unlock()
 
 	if op.finished == nil {
-		return &api.Status{
+		return RESTResult{Object: &api.Status{
 			Status:  api.StatusWorking,
 			Reason:  api.StatusReasonWorking,
 			Details: &api.StatusDetails{ID: op.ID, Kind: "operation"},
-		}, false
+		}}, false
 	}
 	return op.result, true
 }