1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "mojo/bindings/js/waiting_callback.h"
6
7#include "gin/per_context_data.h"
8#include "mojo/public/cpp/environment/environment.h"
9
10namespace mojo {
11namespace js {
12
13namespace {
14
15v8::Handle<v8::String> GetHiddenPropertyName(v8::Isolate* isolate) {
16  return gin::StringToSymbol(isolate, "::mojo::js::WaitingCallback");
17}
18
19}  // namespace
20
21gin::WrapperInfo WaitingCallback::kWrapperInfo = { gin::kEmbedderNativeGin };
22
23// static
24gin::Handle<WaitingCallback> WaitingCallback::Create(
25    v8::Isolate* isolate,
26    v8::Handle<v8::Function> callback,
27    gin::Handle<gin::HandleWrapper> handle_wrapper,
28    MojoHandleSignals signals) {
29  gin::Handle<WaitingCallback> waiting_callback = gin::CreateHandle(
30      isolate, new WaitingCallback(isolate, callback, handle_wrapper));
31  waiting_callback->wait_id_ = Environment::GetDefaultAsyncWaiter()->AsyncWait(
32      handle_wrapper->get().value(),
33      signals,
34      MOJO_DEADLINE_INDEFINITE,
35      &WaitingCallback::CallOnHandleReady,
36      waiting_callback.get());
37  return waiting_callback;
38}
39
40void WaitingCallback::Cancel() {
41  if (!wait_id_)
42    return;
43
44  handle_wrapper_->RemoveCloseObserver(this);
45  handle_wrapper_ = NULL;
46  Environment::GetDefaultAsyncWaiter()->CancelWait(wait_id_);
47  wait_id_ = 0;
48}
49
50WaitingCallback::WaitingCallback(v8::Isolate* isolate,
51                                 v8::Handle<v8::Function> callback,
52                                 gin::Handle<gin::HandleWrapper> handle_wrapper)
53    : wait_id_(0), handle_wrapper_(handle_wrapper.get()) {
54  handle_wrapper_->AddCloseObserver(this);
55  v8::Handle<v8::Context> context = isolate->GetCurrentContext();
56  runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr();
57  GetWrapper(isolate)->SetHiddenValue(GetHiddenPropertyName(isolate), callback);
58}
59
60WaitingCallback::~WaitingCallback() {
61  Cancel();
62}
63
64// static
65void WaitingCallback::CallOnHandleReady(void* closure, MojoResult result) {
66  static_cast<WaitingCallback*>(closure)->OnHandleReady(result);
67}
68
69void WaitingCallback::OnHandleReady(MojoResult result) {
70  wait_id_ = 0;
71  handle_wrapper_->RemoveCloseObserver(this);
72  handle_wrapper_ = NULL;
73
74  if (!runner_)
75    return;
76
77  gin::Runner::Scope scope(runner_.get());
78  v8::Isolate* isolate = runner_->GetContextHolder()->isolate();
79
80  v8::Handle<v8::Value> hidden_value =
81      GetWrapper(isolate)->GetHiddenValue(GetHiddenPropertyName(isolate));
82  v8::Handle<v8::Function> callback;
83  CHECK(gin::ConvertFromV8(isolate, hidden_value, &callback));
84
85  v8::Handle<v8::Value> args[] = { gin::ConvertToV8(isolate, result) };
86  runner_->Call(callback, runner_->global(), 1, args);
87}
88
89void WaitingCallback::OnWillCloseHandle() {
90  Environment::GetDefaultAsyncWaiter()->CancelWait(wait_id_);
91  OnHandleReady(MOJO_RESULT_INVALID_ARGUMENT);
92}
93
94}  // namespace js
95}  // namespace mojo
96