Mojo EDK: Introduce MojoQueryHandleSignalsState API

mojo/edk/js/core.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/js/core.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
@@ skipping 17 matching lines @@
 
 namespace {
 
 MojoResult CloseHandle(gin::Handle<HandleWrapper> handle) {
   if (!handle->get().is_valid())
     return MOJO_RESULT_INVALID_ARGUMENT;
   handle->Close();
   return MOJO_RESULT_OK;
 }
 
+gin::Dictionary QueryHandleSignalsState(const gin::Arguments& args,
+                                        mojo::Handle handle) {
+  gin::Dictionary dictionary = gin::Dictionary::CreateEmpty(args.isolate());
+  if (!handle.is_valid()) {
+    dictionary.Set("result", MOJO_RESULT_INVALID_ARGUMENT);
+  } else {
+    HandleSignalsState state = handle.QuerySignalsState();
+    dictionary.Set("result", MOJO_RESULT_OK);
+    dictionary.Set("satisfiedSignals", state.satisfied_signals);
+    dictionary.Set("satisfiableSignals", state.satisfiable_signals);
+  }
+  return dictionary;
+}
+
 gin::Dictionary WaitHandle(const gin::Arguments& args,
                            mojo::Handle handle,
                            MojoHandleSignals signals,
                            MojoDeadline deadline) {
   v8::Isolate* isolate = args.isolate();
   gin::Dictionary dictionary = gin::Dictionary::CreateEmpty(isolate);
 
   MojoHandleSignalsState signals_state;
   MojoResult result = mojo::Wait(handle, signals, deadline, &signals_state);
   dictionary.Set("result", result);
@@ skipping 333 matching lines @@
   gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
   v8::Local<v8::ObjectTemplate> templ = data->GetObjectTemplate(
       &g_wrapper_info);
 
   if (templ.IsEmpty()) {
     templ =
         gin::ObjectTemplateBuilder(isolate)
             // TODO(mpcomplete): Should these just be methods on the JS Handle
             // object?
             .SetMethod("close", CloseHandle)
+            .SetMethod("queryHandleSignalsState", QueryHandleSignalsState)
             .SetMethod("wait", WaitHandle)
             .SetMethod("waitMany", WaitMany)
             .SetMethod("createMessagePipe", CreateMessagePipe)
             .SetMethod("writeMessage", WriteMessage)
             .SetMethod("readMessage", ReadMessage)
             .SetMethod("createDataPipe", CreateDataPipe)
             .SetMethod("writeData", WriteData)
             .SetMethod("readData", ReadData)
             .SetMethod("drainData", DoDrainData)
             .SetMethod("isHandle", IsHandle)
@@ skipping 67 matching lines @@
 
     data->SetObjectTemplate(&g_wrapper_info, templ);
   }
 
   return templ->NewInstance();
 }
 
 }  // namespace js
 }  // namespace edk
 }  // namespace mojo