Begin implementing V8 bindings for Mojo

mojo/public/bindings/js/core.cc

+// Copyright 2013 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/public/bindings/js/core.h"
+
+#include "gin/arguments.h"
+#include "gin/array_buffer.h"
+#include "gin/converter.h"
+#include "gin/dictionary.h"
+#include "gin/per_isolate_data.h"
+#include "gin/wrapper_info.h"
+#include "mojo/public/bindings/js/handle.h"
+
+namespace mojo {
+namespace js {
+
+namespace {
+
+void Close(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  gin::Arguments args(info);
+
+  mojo::Handle handle = mojo::kInvalidHandle;
+  if (!args.GetNext(&handle))
+    return args.ThrowError();
+
+  args.Return(mojo::Close(handle));
+}
+
+void Wait(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  gin::Arguments args(info);
+
+  mojo::Handle handle = mojo::kInvalidHandle;
+  MojoWaitFlags flags = MOJO_WAIT_FLAG_NONE;
+  MojoDeadline deadline = MOJO_DEADLINE_INDEFINITE;
+
+  if (!args.GetNext(&handle) ||
+      !args.GetNext(&flags) ||
+      !args.GetNext(&deadline)) {
+    return args.ThrowError();
+  }
+
+  args.Return(mojo::Wait(handle, flags, deadline));
+}
+
+void WaitMany(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  gin::Arguments args(info);
+
+  std::vector<mojo::Handle> handles;
+  std::vector<MojoWaitFlags> flags;
+  MojoDeadline deadline = MOJO_DEADLINE_INDEFINITE;
+
+  if (!args.GetNext(&handles) ||
+      !args.GetNext(&flags) ||
+      !args.GetNext(&deadline)) {
+    return args.ThrowError();
+  }
+
+  if (handles.size() != flags.size())
+    return args.ThrowTypeError("Arrays must have the same length.");
+
+  args.Return(mojo::WaitMany(handles.data(), flags.data(),
+                             handles.size(), deadline));
+}
+
+void CreateMessagePipe(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  gin::Arguments args(info);
+
+  mojo::Handle handle_0 = mojo::kInvalidHandle;
+  mojo::Handle handle_1 = mojo::kInvalidHandle;
+  MojoResult result = mojo::CreateMessagePipe(&handle_0, &handle_1);
+
+  gin::Dictionary dictionary = gin::Dictionary::CreateEmpty(info.GetIsolate());
+  dictionary.Set("result", result);
+  dictionary.Set("handle0", handle_0);
+  dictionary.Set("handle1", handle_1);
+  args.Return(dictionary);
+}
+
+void WriteMessage(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  gin::Arguments args(info);
+
+  mojo::Handle handle = mojo::kInvalidHandle;
+  gin::ArrayBufferView buffer(args.isolate());
+  std::vector<mojo::Handle> handles;
+  MojoWaitFlags flags = MOJO_WAIT_FLAG_NONE;
+
+  if (!args.GetNext(&handle) ||
+      !args.GetNext(&buffer) ||
+      !args.GetNext(&handles) ||
+      !args.GetNext(&flags)) {
+    return args.ThrowError();
+  }
+
+  args.Return(mojo::WriteMessage(handle, buffer.bytes(), buffer.num_bytes(),
+                                 handles.data(), handles.size(), flags));
+}
+
+void ReadMessage(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  gin::Arguments args(info);
+
+  mojo::Handle handle = mojo::kInvalidHandle;
+  gin::ArrayBufferView buffer(args.isolate());
+  uint32_t num_handles = 0;
+  MojoWaitFlags flags = MOJO_WAIT_FLAG_NONE;
+
+  if (!args.GetNext(&handle) ||
+      !args.GetNext(&buffer) ||
+      !args.GetNext(&num_handles) ||
+      !args.GetNext(&flags)) {
+    return args.ThrowError();
+  }
+
+  uint32_t num_bytes = buffer.num_bytes();
+  std::vector<mojo::Handle> handles(num_handles);
+  MojoResult result = mojo::ReadMessage(handle, buffer.bytes(), &num_bytes,
+                                        handles.data(), &num_handles, flags);
+  handles.resize(num_handles);
+
+  // TODO(abarth): We should benchmark this codepath to make sure it's ok to
+  // allocate all this memory on each read.
+  gin::Dictionary dictionary = gin::Dictionary::CreateEmpty(info.GetIsolate());
+  dictionary.Set("result", result);
+  dictionary.Set("bytesRead", num_bytes);
+  dictionary.Set("handles", handles);
+  args.Return(dictionary);
+}
+
+gin::WrapperInfo g_core_wrapper_info = {};
+
+}
+
+v8::Local<v8::ObjectTemplate> GetCoreTemplate(v8::Isolate* isolate) {
+  gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
+  v8::Local<v8::ObjectTemplate> templ = data->GetObjectTemplate(
+      &g_core_wrapper_info);
+
+  if (templ.IsEmpty()) {
+    templ = v8::ObjectTemplate::New();
+
+    templ->Set(gin::StringToSymbol(isolate, "close"),
+               v8::FunctionTemplate::New(Close));
+    templ->Set(gin::StringToSymbol(isolate, "wait"),
+               v8::FunctionTemplate::New(Wait));
+    templ->Set(gin::StringToSymbol(isolate, "waitMany"),
+               v8::FunctionTemplate::New(WaitMany));
+    templ->Set(gin::StringToSymbol(isolate, "createMessagePipe"),
+               v8::FunctionTemplate::New(CreateMessagePipe));
+    templ->Set(gin::StringToSymbol(isolate, "writeMessage"),
+               v8::FunctionTemplate::New(WriteMessage));
+    templ->Set(gin::StringToSymbol(isolate, "readMessage"),
+               v8::FunctionTemplate::New(ReadMessage));
+
+    data->SetObjectTemplate(&g_core_wrapper_info, templ);
+  }
+
+  return templ;
+}
+
+}  // namespace js
+}  // namespace mojo