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// Copyright (c) 2009 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_SERVICE_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_SERVICE_H_
#include <map>
#include <set>
#include <string>
#include "base/lock.h"
#include "chrome/browser/renderer_host/render_process_host.h"
#include "chrome/common/notification_observer.h"
class MessageLoop;
class RenderProcessHost;
class ResourceMessageFilter;
class URLRequestContext;
// This class manages message passing between renderer processes. It maintains
// a list of available extensions and which renderers each lives in, as well as
// a set of open channels.
//
// Terminology:
// channel: connection between two ports (one of which belongs to an extension)
// port: an IPC::Message::Sender interface through which we communicate to a
// process. We use MessageFilters for this since that allows us to send our
// messages on the IO thread.
class ExtensionMessageService : public NotificationObserver {
public:
// Returns the message service for the given context. Messages can only
// be sent within a single context.
static ExtensionMessageService* GetInstance(URLRequestContext* context);
ExtensionMessageService();
// --- UI thread only:
// Gets the process for the specified extension.
RenderProcessHost* GetProcessForExtension(const std::string& extension_id);
// Register an extension and its corresponding renderer process.
void RegisterExtension(const std::string& extension_id,
int render_process_id);
// Add or remove |render_process_pid| as a listener for |event_name|.
void AddEventListener(std::string event_name, int render_process_id);
void RemoveEventListener(std::string event_name, int render_process_id);
// Sends a message from a renderer to the given port.
// TODO(mpcomplete): include the source tab.
void PostMessageFromRenderer(int port_id, const std::string& message);
// Send an event to every registered extension renderer.
void DispatchEventToRenderers(
const std::string& event_name, const std::string& event_args);
// NotificationObserver interface.
void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
// --- IO thread only:
// Given an extension's ID, opens a channel between the given renderer "port"
// and that extension. Returns a channel ID to be used for posting messages
// between the processes, or -1 if the extension doesn't exist.
// This runs on the IO thread so that it can be used in a synchronous IPC
// message.
int OpenChannelToExtension(int routing_id, const std::string& extension_id,
ResourceMessageFilter* source);
private:
// Gets the process ID for the specified etension.
// NOTE: this can be called from any thread.
int GetProcessIdForExtension(const std::string& extension_id);
// The UI message loop, used for posting tasks.
MessageLoop* ui_loop_;
// A map of extension ID to the render_process_id that the extension lives in.
typedef std::map<std::string, int> ProcessIDMap;
ProcessIDMap process_ids_;
// Protects the process_ids map, since it can be accessed on the IO thread
// or UI thread. Be careful not to hold this lock when calling external
// code (especially sending messages) to avoid deadlock.
Lock process_ids_lock_;
// A map between an event name and a set of process id's that are listening
// to that event.
typedef std::map<std::string, std::set<int> > ListenerMap;
ListenerMap listeners_;
// --- UI thread only:
// UI-thread specific initialization. Does nothing if called more than once.
void Init();
// Handles channel creation and notifies the destination that a channel was
// opened.
void OpenChannelOnUIThread(int source_routing_id,
int source_port_id, int source_process_id,
int dest_port_id, int dest_process_id);
// The connection between two renderers. It is possible that both ports
// refer to the same renderer.
struct MessageChannel {
RenderProcessHost* port1;
RenderProcessHost* port2;
};
// A map of channel ID to its channel object.
typedef std::map<int, MessageChannel> MessageChannelMap;
MessageChannelMap channels_;
// True if Init has been called.
bool initialized_;
// --- IO thread only:
// For generating unique channel IDs.
int next_port_id_;
DISALLOW_COPY_AND_ASSIGN(ExtensionMessageService);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_SERVICE_H_
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