| // 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/waiting_callback.h" |
| |
| #include "base/bind.h" |
| #include "base/message_loop/message_loop.h" |
| #include "gin/per_context_data.h" |
| |
| namespace mojo { |
| namespace edk { |
| namespace js { |
| |
| namespace { |
| |
| v8::Local<v8::Private> GetHiddenPropertyName(v8::Isolate* isolate) { |
| return v8::Private::ForApi( |
| isolate, gin::StringToV8(isolate, "::mojo::js::WaitingCallback")); |
| } |
| |
| } // namespace |
| |
| gin::WrapperInfo WaitingCallback::kWrapperInfo = { gin::kEmbedderNativeGin }; |
| |
| // static |
| gin::Handle<WaitingCallback> WaitingCallback::Create( |
| v8::Isolate* isolate, |
| v8::Local<v8::Function> callback, |
| gin::Handle<HandleWrapper> handle_wrapper, |
| MojoHandleSignals signals, |
| bool one_shot) { |
| gin::Handle<WaitingCallback> waiting_callback = gin::CreateHandle( |
| isolate, new WaitingCallback(isolate, callback, one_shot)); |
| MojoResult result = waiting_callback->watcher_.Watch( |
| handle_wrapper->get(), signals, |
| base::Bind(&WaitingCallback::OnHandleReady, |
| base::Unretained(waiting_callback.get()))); |
| |
| // The signals may already be unsatisfiable. |
| if (result == MOJO_RESULT_FAILED_PRECONDITION) |
| waiting_callback->OnHandleReady(MOJO_RESULT_FAILED_PRECONDITION); |
| |
| return waiting_callback; |
| } |
| |
| void WaitingCallback::Cancel() { |
| if (watcher_.IsWatching()) |
| watcher_.Cancel(); |
| } |
| |
| WaitingCallback::WaitingCallback(v8::Isolate* isolate, |
| v8::Local<v8::Function> callback, |
| bool one_shot) |
| : one_shot_(one_shot), |
| watcher_(FROM_HERE, SimpleWatcher::ArmingPolicy::AUTOMATIC), |
| weak_factory_(this) { |
| v8::Local<v8::Context> context = isolate->GetCurrentContext(); |
| runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr(); |
| v8::Maybe<bool> result = GetWrapper(isolate).ToLocalChecked()->SetPrivate( |
| context, GetHiddenPropertyName(isolate), callback); |
| DCHECK(result.IsJust() && result.FromJust()); |
| } |
| |
| WaitingCallback::~WaitingCallback() { |
| Cancel(); |
| } |
| |
| void WaitingCallback::OnHandleReady(MojoResult result) { |
| if (!runner_) |
| return; |
| |
| gin::Runner::Scope scope(runner_.get()); |
| v8::Isolate* isolate = runner_->GetContextHolder()->isolate(); |
| |
| v8::Local<v8::Object> wrapper; |
| if (!GetWrapper(isolate).ToLocal(&wrapper)) { |
| Cancel(); |
| return; |
| } |
| |
| v8::Local<v8::Value> hidden_value = |
| wrapper |
| ->GetPrivate(runner_->GetContextHolder()->context(), |
| GetHiddenPropertyName(isolate)) |
| .ToLocalChecked(); |
| v8::Local<v8::Function> callback; |
| bool convert_result = gin::ConvertFromV8(isolate, hidden_value, &callback); |
| DCHECK(convert_result); |
| |
| v8::Local<v8::Value> args[] = {gin::ConvertToV8(isolate, result)}; |
| runner_->Call(callback, runner_->global(), 1, args); |
| |
| if (one_shot_ || result == MOJO_RESULT_CANCELLED) { |
| runner_.reset(); |
| Cancel(); |
| } |
| } |
| |
| } // namespace js |
| } // namespace edk |
| } // namespace mojo |