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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/common/webmessageportchannel_impl.h"
#include "chrome/common/child_process.h"
#include "chrome/common/child_thread.h"
#include "chrome/common/worker_messages.h"
#include "webkit/api/public/WebString.h"
#include "webkit/api/public/WebMessagePortChannelClient.h"
using WebKit::WebMessagePortChannel;
using WebKit::WebMessagePortChannelArray;
using WebKit::WebMessagePortChannelClient;
using WebKit::WebString;
WebMessagePortChannelImpl::WebMessagePortChannelImpl()
: client_(NULL),
route_id_(MSG_ROUTING_NONE),
message_port_id_(MSG_ROUTING_NONE) {
AddRef();
Init();
}
WebMessagePortChannelImpl::WebMessagePortChannelImpl(
int route_id,
int message_port_id)
: client_(NULL),
route_id_(route_id),
message_port_id_(message_port_id) {
AddRef();
Init();
}
WebMessagePortChannelImpl::~WebMessagePortChannelImpl() {
// If we have any queued messages with attached ports, manually destroy them.
while (!message_queue_.empty()) {
const std::vector<WebMessagePortChannelImpl*>& channel_array =
message_queue_.front().ports;
for (size_t i = 0; i < channel_array.size(); i++) {
channel_array[i]->destroy();
}
message_queue_.pop();
}
if (message_port_id_ != MSG_ROUTING_NONE)
Send(new WorkerProcessHostMsg_DestroyMessagePort(message_port_id_));
if (route_id_ != MSG_ROUTING_NONE)
ChildThread::current()->RemoveRoute(route_id_);
}
void WebMessagePortChannelImpl::setClient(WebMessagePortChannelClient* client) {
// Must lock here since client_ is called on the main thread.
AutoLock auto_lock(lock_);
client_ = client;
}
void WebMessagePortChannelImpl::destroy() {
setClient(NULL);
// Release the object on the main thread, since the destructor might want to
// send an IPC, and that has to happen on the main thread.
ChildThread::current()->message_loop()->ReleaseSoon(FROM_HERE, this);
}
void WebMessagePortChannelImpl::entangle(WebMessagePortChannel* channel) {
// The message port ids might not be set up yet, if this channel wasn't
// created on the main thread. So need to wait until we're on the main thread
// before getting the other message port id.
scoped_refptr<WebMessagePortChannelImpl> webchannel =
static_cast<WebMessagePortChannelImpl*>(channel);
Entangle(webchannel);
}
void WebMessagePortChannelImpl::postMessage(
const WebString& message,
WebMessagePortChannelArray* channels) {
if (MessageLoop::current() != ChildThread::current()->message_loop()) {
ChildThread::current()->message_loop()->PostTask(FROM_HERE,
NewRunnableMethod(this, &WebMessagePortChannelImpl::postMessage,
message, channels));
return;
}
std::vector<int> message_port_ids(channels ? channels->size() : 0);
if (channels) {
for (size_t i = 0; i < channels->size(); ++i) {
WebMessagePortChannelImpl* webchannel =
static_cast<WebMessagePortChannelImpl*>((*channels)[i]);
message_port_ids[i] = webchannel->message_port_id();
webchannel->QueueMessages();
DCHECK(message_port_ids[i] != MSG_ROUTING_NONE);
}
}
IPC::Message* msg = new WorkerProcessHostMsg_PostMessage(
message_port_id_, message, message_port_ids);
Send(msg);
}
bool WebMessagePortChannelImpl::tryGetMessage(
WebString* message,
WebMessagePortChannelArray& channels) {
AutoLock auto_lock(lock_);
if (message_queue_.empty())
return false;
*message = message_queue_.front().message;
const std::vector<WebMessagePortChannelImpl*>& channel_array =
message_queue_.front().ports;
WebMessagePortChannelArray result_ports(channel_array.size());
for (size_t i = 0; i < channel_array.size(); i++) {
result_ports[i] = channel_array[i];
}
channels.swap(result_ports);
message_queue_.pop();
return true;
}
void WebMessagePortChannelImpl::Init() {
if (MessageLoop::current() != ChildThread::current()->message_loop()) {
ChildThread::current()->message_loop()->PostTask(FROM_HERE,
NewRunnableMethod(this, &WebMessagePortChannelImpl::Init));
return;
}
if (route_id_ == MSG_ROUTING_NONE) {
DCHECK(message_port_id_ == MSG_ROUTING_NONE);
Send(new WorkerProcessHostMsg_CreateMessagePort(
&route_id_, &message_port_id_));
}
ChildThread::current()->AddRoute(route_id_, this);
}
void WebMessagePortChannelImpl::Entangle(
scoped_refptr<WebMessagePortChannelImpl> channel) {
if (MessageLoop::current() != ChildThread::current()->message_loop()) {
ChildThread::current()->message_loop()->PostTask(FROM_HERE,
NewRunnableMethod(this, &WebMessagePortChannelImpl::Entangle, channel));
return;
}
Send(new WorkerProcessHostMsg_Entangle(
message_port_id_, channel->message_port_id()));
}
void WebMessagePortChannelImpl::QueueMessages() {
// This message port is being sent elsewhere (perhaps to another process).
// The new endpoint needs to recieve the queued messages, including ones that
// could still be in-flight. So we tell the browser to queue messages, and it
// sends us an ack, whose receipt we know means that no more messages are
// in-flight. We then send the queued messages to the browser, which prepends
// them to the ones it queued and it sends them to the new endpoint.
Send(new WorkerProcessHostMsg_QueueMessages(message_port_id_));
// The process could potentially go away while we're still waiting for
// in-flight messages. Ensure it stays alive.
ChildProcess::current()->AddRefProcess();
}
void WebMessagePortChannelImpl::Send(IPC::Message* message) {
if (MessageLoop::current() != ChildThread::current()->message_loop()) {
DCHECK(!message->is_sync());
ChildThread::current()->message_loop()->PostTask(FROM_HERE,
NewRunnableMethod(this, &WebMessagePortChannelImpl::Send, message));
return;
}
ChildThread::current()->Send(message);
}
void WebMessagePortChannelImpl::OnMessageReceived(const IPC::Message& message) {
IPC_BEGIN_MESSAGE_MAP(WebMessagePortChannelImpl, message)
IPC_MESSAGE_HANDLER(WorkerProcessMsg_Message, OnMessage)
IPC_MESSAGE_HANDLER(WorkerProcessMsg_MessagesQueued, OnMessagedQueued)
IPC_END_MESSAGE_MAP()
}
void WebMessagePortChannelImpl::OnMessage(
const string16& message,
const std::vector<int>& sent_message_port_ids,
const std::vector<int>& new_routing_ids) {
AutoLock auto_lock(lock_);
Message msg;
msg.message = message;
if (!sent_message_port_ids.empty()) {
msg.ports.resize(sent_message_port_ids.size());
for (size_t i = 0; i < sent_message_port_ids.size(); ++i) {
msg.ports[i] = new WebMessagePortChannelImpl(
new_routing_ids[i], sent_message_port_ids[i]);
}
}
bool was_empty = message_queue_.empty();
message_queue_.push(msg);
if (client_ && was_empty)
client_->messageAvailable();
}
void WebMessagePortChannelImpl::OnMessagedQueued() {
std::vector<QueuedMessage> queued_messages;
{
AutoLock auto_lock(lock_);
queued_messages.reserve(message_queue_.size());
while (!message_queue_.empty()) {
string16 message = message_queue_.front().message;
const std::vector<WebMessagePortChannelImpl*>& channel_array =
message_queue_.front().ports;
std::vector<int> port_ids(channel_array.size());
for (size_t i = 0; i < channel_array.size(); ++i) {
port_ids[i] = channel_array[i]->message_port_id();
}
queued_messages.push_back(std::make_pair(message, port_ids));
message_queue_.pop();
}
}
Send(new WorkerProcessHostMsg_SendQueuedMessages(
message_port_id_, queued_messages));
message_port_id_ = MSG_ROUTING_NONE;
Release();
ChildProcess::current()->ReleaseProcess();
}
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