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// Copyright 2015 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 "extensions/renderer/wake_event_page.h"
#include <memory>
#include <utility>
#include "base/atomic_sequence_num.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "content/public/child/worker_thread.h"
#include "content/public/renderer/render_thread.h"
#include "extensions/common/extension_messages.h"
#include "extensions/renderer/object_backed_native_handler.h"
#include "extensions/renderer/script_context.h"
#include "extensions/renderer/v8_helpers.h"
#include "ipc/ipc_message.h"
#include "ipc/ipc_message_macros.h"
namespace extensions {
using namespace v8_helpers;
namespace {
base::LazyInstance<WakeEventPage> g_instance = LAZY_INSTANCE_INITIALIZER;
} // namespace
class WakeEventPage::WakeEventPageNativeHandler
: public ObjectBackedNativeHandler {
public:
// Handles own lifetime.
WakeEventPageNativeHandler(ScriptContext* context,
const std::string& name,
const MakeRequestCallback& make_request)
: ObjectBackedNativeHandler(context),
make_request_(make_request),
weak_ptr_factory_(this) {
// Use Unretained not a WeakPtr because RouteFunction is tied to the
// lifetime of this, so there is no way for DoWakeEventPage to be called
// after destruction.
RouteFunction(name, base::Bind(&WakeEventPageNativeHandler::DoWakeEventPage,
base::Unretained(this)));
// Delete self on invalidation. base::Unretained because by definition this
// can't be deleted before it's deleted.
context->AddInvalidationObserver(base::Bind(
&WakeEventPageNativeHandler::DeleteSelf, base::Unretained(this)));
};
~WakeEventPageNativeHandler() override {}
private:
void DeleteSelf() {
Invalidate();
delete this;
}
// Called by JavaScript with a single argument, the function to call when the
// event page has been woken.
void DoWakeEventPage(const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK_EQ(1, args.Length());
CHECK(args[0]->IsFunction());
v8::Global<v8::Function> callback(args.GetIsolate(),
args[0].As<v8::Function>());
const std::string& extension_id = context()->GetExtensionID();
CHECK(!extension_id.empty());
make_request_.Run(
extension_id,
base::Bind(&WakeEventPageNativeHandler::OnEventPageIsAwake,
weak_ptr_factory_.GetWeakPtr(), base::Passed(&callback)));
}
void OnEventPageIsAwake(v8::Global<v8::Function> callback, bool success) {
v8::Isolate* isolate = context()->isolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Value> args[] = {
v8::Boolean::New(isolate, success),
};
context()->SafeCallFunction(v8::Local<v8::Function>::New(isolate, callback),
arraysize(args), args);
}
MakeRequestCallback make_request_;
base::WeakPtrFactory<WakeEventPageNativeHandler> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(WakeEventPageNativeHandler);
};
// static
WakeEventPage* WakeEventPage::Get() {
return g_instance.Pointer();
}
void WakeEventPage::Init(content::RenderThread* render_thread) {
DCHECK(render_thread);
DCHECK_EQ(content::RenderThread::Get(), render_thread);
DCHECK(!message_filter_);
message_filter_ = render_thread->GetSyncMessageFilter();
render_thread->AddObserver(this);
}
v8::Local<v8::Function> WakeEventPage::GetForContext(ScriptContext* context) {
DCHECK(message_filter_);
v8::Isolate* isolate = context->isolate();
v8::EscapableHandleScope handle_scope(isolate);
v8::Handle<v8::Context> v8_context = context->v8_context();
v8::Context::Scope context_scope(v8_context);
// Cache the imported function as a hidden property on the global object of
// |v8_context|. Creating it isn't free.
v8::Local<v8::Private> kWakeEventPageKey =
v8::Private::ForApi(isolate, ToV8StringUnsafe(isolate, "WakeEventPage"));
v8::Local<v8::Value> wake_event_page;
if (!v8_context->Global()
->GetPrivate(v8_context, kWakeEventPageKey)
.ToLocal(&wake_event_page) ||
wake_event_page->IsUndefined()) {
// Implement this using a NativeHandler, which requires a function name
// (arbitrary in this case). Handles own lifetime.
const char* kFunctionName = "WakeEventPage";
WakeEventPageNativeHandler* native_handler = new WakeEventPageNativeHandler(
context, kFunctionName, base::Bind(&WakeEventPage::MakeRequest,
// Safe, owned by a LazyInstance.
base::Unretained(this)));
// Extract and cache the wake-event-page function from the native handler.
wake_event_page = GetPropertyUnsafe(
v8_context, native_handler->NewInstance(), kFunctionName);
v8_context->Global()
->SetPrivate(v8_context, kWakeEventPageKey, wake_event_page)
.FromJust();
}
CHECK(wake_event_page->IsFunction());
return handle_scope.Escape(wake_event_page.As<v8::Function>());
}
WakeEventPage::RequestData::RequestData(int thread_id,
const OnResponseCallback& on_response)
: thread_id(thread_id), on_response(on_response) {}
WakeEventPage::RequestData::~RequestData() {}
WakeEventPage::WakeEventPage() {}
WakeEventPage::~WakeEventPage() {}
void WakeEventPage::MakeRequest(const std::string& extension_id,
const OnResponseCallback& on_response) {
static base::AtomicSequenceNumber sequence_number;
int request_id = sequence_number.GetNext();
{
base::AutoLock lock(requests_lock_);
requests_[request_id] = base::MakeUnique<RequestData>(
content::WorkerThread::GetCurrentId(), on_response);
}
message_filter_->Send(
new ExtensionHostMsg_WakeEventPage(request_id, extension_id));
}
bool WakeEventPage::OnControlMessageReceived(const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(WakeEventPage, message)
IPC_MESSAGE_HANDLER(ExtensionMsg_WakeEventPageResponse,
OnWakeEventPageResponse)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void WakeEventPage::OnWakeEventPageResponse(int request_id, bool success) {
std::unique_ptr<RequestData> request_data;
{
base::AutoLock lock(requests_lock_);
auto it = requests_.find(request_id);
CHECK(it != requests_.end()) << "No request with ID " << request_id;
request_data = std::move(it->second);
requests_.erase(it);
}
if (request_data->thread_id == 0) {
// Thread ID of 0 means it wasn't called on a worker thread, so safe to
// call immediately.
request_data->on_response.Run(success);
} else {
content::WorkerThread::PostTask(
request_data->thread_id,
base::Bind(request_data->on_response, success));
}
}
} // namespace extensions
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