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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.
#ifndef EXTENSIONS_RENDERER_WAKE_EVENT_PAGE_H_
#define EXTENSIONS_RENDERER_WAKE_EVENT_PAGE_H_
#include <string>
#include "base/callback.h"
#include "base/containers/scoped_ptr_hash_map.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "content/public/renderer/render_process_observer.h"
#include "ipc/ipc_sync_message_filter.h"
#include "v8/include/v8.h"
namespace content {
class RenderThread;
}
namespace extensions {
class ScriptContext;
// This class implements the wake-event-page JavaScript function, which wakes
// an event page and runs a callback when done.
//
// Note, the function will do a round trip to the browser even if event page is
// open. Any optimisation to prevent this must be at the JavaScript level.
class WakeEventPage : public content::RenderProcessObserver {
public:
WakeEventPage();
~WakeEventPage() override;
// Returns the single instance of the WakeEventPage object.
//
// Thread safe.
static WakeEventPage* Get();
// Initializes the WakeEventPage.
//
// This must be called before any bindings are installed, and must be called
// on the render thread.
void Init(content::RenderThread* render_thread);
// Returns the wake-event-page function bound to a given context. The
// function will be cached as a hidden value in the context's global object.
//
// To mix C++ and JavaScript, example usage might be:
//
// WakeEventPage::Get().GetForContext(context)(function() {
// ...
// });
//
// Thread safe.
v8::Local<v8::Function> GetForContext(ScriptContext* context);
private:
class WakeEventPageNativeHandler;
// The response from an ExtensionHostMsg_WakeEvent call, passed true if the
// call was successful, false on failure.
using OnResponseCallback = base::Callback<void(bool)>;
// Makes an ExtensionHostMsg_WakeEvent request for an extension ID. The
// second argument is a callback to run when the request has completed.
using MakeRequestCallback =
base::Callback<void(const std::string&, const OnResponseCallback&)>;
// For |requests_|.
struct RequestData {
RequestData(int thread_id, const OnResponseCallback& on_response);
~RequestData();
// The thread ID the request was made on. |on_response| must be called on
// that thread.
int thread_id;
// Callback to run when the response to the request arrives.
OnResponseCallback on_response;
};
// Runs |on_response|, passing it |success|.
static void RunOnResponseWithResult(const OnResponseCallback& on_response,
bool success);
// Sends the ExtensionHostMsg_WakeEvent IPC for |extension_id|, and
// updates |requests_| bookkeeping.
void MakeRequest(const std::string& extension_id,
const OnResponseCallback& on_response);
// content::RenderProcessObserver:
bool OnControlMessageReceived(const IPC::Message& message) override;
// OnControlMessageReceived handlers:
void OnWakeEventPageResponse(int request_id, bool success);
// IPC sender. Belongs to the render thread, but thread safe.
scoped_refptr<IPC::SyncMessageFilter> message_filter_;
// All in-flight requests, keyed by request ID. Used on multiple threads, so
// must be guarded by |requests_lock_|.
base::ScopedPtrHashMap<int, scoped_ptr<RequestData>> requests_;
// Lock for |requests_|.
base::Lock requests_lock_;
DISALLOW_COPY_AND_ASSIGN(WakeEventPage);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_WAKE_EVENT_PAGE_H_
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