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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.
#include "chrome/browser/extensions/extension_message_service.h"
#include "base/singleton.h"
#include "base/values.h"
#include "chrome/browser/chrome_thread.h"
#include "chrome/browser/extensions/extension.h"
#include "chrome/browser/extensions/extension_view.h"
#include "chrome/browser/renderer_host/render_view_host.h"
#include "chrome/browser/renderer_host/render_process_host.h"
#include "chrome/browser/renderer_host/resource_message_filter.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/render_messages.h"
#include "chrome/common/stl_util-inl.h"
// Since we have 2 ports for every channel, we just index channels by half the
// port ID.
#define GET_CHANNEL_ID(port_id) ((port_id) / 2)
// Port1 is always even, port2 is always odd.
#define IS_PORT1_ID(port_id) (((port_id) & 1) == 0)
// Change even to odd and vice versa, to get the other side of a given channel.
#define GET_OPPOSITE_PORT_ID(source_port_id) ((source_port_id) ^ 1)
namespace {
typedef std::map<URLRequestContext*, ExtensionMessageService*> InstanceMap;
struct SingletonData {
~SingletonData() {
STLDeleteContainerPairSecondPointers(map.begin(), map.end());
}
Lock lock;
InstanceMap map;
};
} // namespace
// Since ExtensionMessageService is a collection of Singletons, we don't need to
// grab a reference to it when creating Tasks involving it.
template <> struct RunnableMethodTraits<ExtensionMessageService> {
static void RetainCallee(ExtensionMessageService*) {}
static void ReleaseCallee(ExtensionMessageService*) {}
};
// static
ExtensionMessageService* ExtensionMessageService::GetInstance(
URLRequestContext* context) {
SingletonData* data = Singleton<SingletonData>::get();
AutoLock lock(data->lock);
ExtensionMessageService* instance = data->map[context];
if (!instance) {
instance = new ExtensionMessageService();
data->map[context] = instance;
}
return instance;
}
ExtensionMessageService::ExtensionMessageService()
: next_port_id_(0), observing_renderer_shutdown_(false) {
}
void ExtensionMessageService::RegisterExtension(
const std::string& extension_id, int render_process_id) {
AutoLock lock(process_ids_lock_);
DCHECK(process_ids_.find(extension_id) == process_ids_.end() ||
process_ids_[extension_id] == render_process_id);
process_ids_[extension_id] = render_process_id;
}
int ExtensionMessageService::OpenChannelToExtension(
const std::string& extension_id, ResourceMessageFilter* source) {
DCHECK(MessageLoop::current() ==
ChromeThread::GetMessageLoop(ChromeThread::IO));
// Lookup the targeted extension process.
int process_id;
{
AutoLock lock(process_ids_lock_);
ProcessIDMap::iterator process_id_it = process_ids_.find(
StringToLowerASCII(extension_id));
if (process_id_it == process_ids_.end())
return -1;
process_id = process_id_it->second;
}
RendererMap::iterator renderer = renderers_.find(process_id);
if (renderer == renderers_.end())
return -1;
ResourceMessageFilter* dest = renderer->second;
// Create a channel ID for both sides of the channel.
int port1_id = next_port_id_++;
int port2_id = next_port_id_++;
DCHECK(IS_PORT1_ID(port1_id));
DCHECK(GET_OPPOSITE_PORT_ID(port1_id) == port2_id);
DCHECK(GET_OPPOSITE_PORT_ID(port2_id) == port1_id);
DCHECK(GET_CHANNEL_ID(port1_id) == GET_CHANNEL_ID(port2_id));
MessageChannel channel;
channel.port1 = source;
channel.port2 = dest;
channels_[GET_CHANNEL_ID(port1_id)] = channel;
// Send each process the id for the opposite port.
dest->Send(new ViewMsg_ExtensionHandleConnect(port1_id));
return port2_id;
}
void ExtensionMessageService::PostMessageFromRenderer(
int port_id, const std::string& message, ResourceMessageFilter* source) {
DCHECK(MessageLoop::current() ==
ChromeThread::GetMessageLoop(ChromeThread::IO));
// Look up the channel by port1's ID.
MessageChannelMap::iterator iter =
channels_.find(GET_CHANNEL_ID(port_id));
if (iter == channels_.end())
return;
MessageChannel& channel = iter->second;
// Figure out which port the ID corresponds to.
ResourceMessageFilter* dest = NULL;
if (IS_PORT1_ID(port_id)) {
dest = channel.port1;
DCHECK(source == channel.port2);
} else {
dest = channel.port2;
DCHECK(source == channel.port1);
}
int source_port_id = GET_OPPOSITE_PORT_ID(port_id);
dest->Send(new ViewMsg_ExtensionHandleMessage(message, source_port_id));
}
void ExtensionMessageService::DispatchEventToRenderers(
const std::string& event_name, const std::string& event_args) {
MessageLoop* io_thread = ChromeThread::GetMessageLoop(ChromeThread::IO);
if (MessageLoop::current() != io_thread) {
// Do the actual work on the IO thread.
io_thread->PostTask(FROM_HERE, NewRunnableMethod(this,
&ExtensionMessageService::DispatchEventToRenderers,
event_name, event_args));
return;
}
// TODO(mpcomplete): we should only send messages to extension process
// renderers.
std::set<ResourceMessageFilter*>::iterator renderer;
for (renderer = renderers_unique_.begin();
renderer != renderers_unique_.end(); ++renderer) {
(*renderer)->Send(new ViewMsg_ExtensionHandleEvent(event_name, event_args));
}
}
void ExtensionMessageService::RendererReady(ResourceMessageFilter* renderer) {
DCHECK(MessageLoop::current() ==
ChromeThread::GetMessageLoop(ChromeThread::IO));
DCHECK(renderers_.find(renderer->GetProcessId()) == renderers_.end());
renderers_[renderer->GetProcessId()] = renderer;
renderers_unique_.insert(renderer);
if (!observing_renderer_shutdown_) {
observing_renderer_shutdown_ = true;
NotificationService::current()->AddObserver(
this,
NotificationType::RESOURCE_MESSAGE_FILTER_SHUTDOWN,
NotificationService::AllSources());
}
}
void ExtensionMessageService::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(MessageLoop::current() ==
ChromeThread::GetMessageLoop(ChromeThread::IO));
DCHECK(type.value == NotificationType::RESOURCE_MESSAGE_FILTER_SHUTDOWN);
ResourceMessageFilter* renderer = Source<ResourceMessageFilter>(source).ptr();
renderers_.erase(renderer->GetProcessId());
renderers_unique_.erase(renderer);
// Close any channels that share this renderer.
// TODO(mpcomplete): should we notify the other side of the port?
for (MessageChannelMap::iterator it = channels_.begin();
it != channels_.end(); ) {
MessageChannelMap::iterator current = it++;
if (current->second.port1 == renderer || current->second.port2 == renderer)
channels_.erase(current);
}
}
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