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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.
// DevToolsAgent belongs to the inspectable renderer and provides Glue's
// agents with the communication capabilities. All messages from/to Glue's
// agents infrastructure are flowing through this comminucation agent.
//
// DevToolsAgent is registered as an IPC filter in order to be able to
// dispatch messages while on the IO thread. The reason for that is that while
// debugging, Render thread is being held by the v8 and hence no messages
// are being dispatched there. While holding the thread in a tight loop,
// v8 provides thread-safe Api for controlling debugger. In our case v8's Api
// is being used from this communication agent on the IO thread.
#include "chrome/renderer/devtools_agent.h"
#include "base/message_loop.h"
#include "chrome/common/render_messages.h"
#include "chrome/renderer/devtools_messages.h"
// TODO(yurys): remove this macros once plugins available on other platforms
#if defined(OS_WIN)
#include "chrome/renderer/plugin_channel_host.h"
#endif // OS_WIN
#include "chrome/renderer/render_process.h"
#include "chrome/renderer/render_view.h"
#include "webkit/glue/webdevtoolsagent.h"
DevToolsAgent::DevToolsAgent(int routing_id,
RenderView* view,
MessageLoop* view_loop)
: debugger_(NULL),
routing_id_(routing_id),
view_(view),
view_loop_(view_loop),
channel_(NULL),
io_loop_(NULL) {
}
DevToolsAgent::~DevToolsAgent() {
}
// Called on render thread.
void DevToolsAgent::RenderViewDestroyed() {
DCHECK(MessageLoop::current() == view_loop_);
view_ = NULL;
}
void DevToolsAgent::Send(const IPC::Message& tools_client_message) {
// It's possible that this will get cleared out from under us.
MessageLoop* io_loop = io_loop_;
if (!io_loop)
return;
IPC::Message* m = new ViewHostMsg_ForwardToDevToolsClient(
routing_id_,
tools_client_message);
io_loop->PostTask(FROM_HERE, NewRunnableMethod(
this, &DevToolsAgent::SendFromIOThread, m));
}
void DevToolsAgent::SendFromIOThread(IPC::Message* message) {
if (channel_) {
channel_->Send(message);
} else {
delete message;
}
}
// Called on IO thread.
void DevToolsAgent::OnFilterAdded(IPC::Channel* channel) {
io_loop_ = MessageLoop::current();
channel_ = channel;
}
// Called on IO thread.
bool DevToolsAgent::OnMessageReceived(const IPC::Message& message) {
DCHECK(MessageLoop::current() == io_loop_);
if (message.routing_id() != routing_id_)
return false;
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(DevToolsAgent, message)
IPC_MESSAGE_HANDLER(DevToolsAgentMsg_DebugAttach, OnDebugAttach)
IPC_MESSAGE_HANDLER(DevToolsAgentMsg_DebugDetach, OnDebugDetach)
IPC_MESSAGE_HANDLER(DevToolsAgentMsg_DebugBreak, OnDebugBreak)
IPC_MESSAGE_HANDLER(DevToolsAgentMsg_DebugCommand, OnDebugCommand)
IPC_MESSAGE_HANDLER(DevToolsAgentMsg_RpcMessage, OnRpcMessage)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
// Called on IO thread.
void DevToolsAgent::OnFilterRemoved() {
io_loop_ = NULL;
channel_ = NULL;
}
void DevToolsAgent::DebuggerOutput(const std::wstring& out) {
Send(DevToolsClientMsg_DebuggerOutput(out));
}
void DevToolsAgent::EvaluateScript(const std::wstring& script) {
DCHECK(MessageLoop::current() == view_loop_);
// view_ may have been cleared after this method execution was scheduled.
if (view_)
view_->EvaluateScript(L"", script);
}
void DevToolsAgent::OnDebugAttach() {
DCHECK(MessageLoop::current() == io_loop_);
if (!debugger_) {
debugger_ = new DebuggerBridge(this);
}
debugger_->Attach();
Send(DevToolsClientMsg_DidDebugAttach());
// TODO(yurys): remove this macros once plugins available on other platforms
#if defined(OS_WIN)
// Tell the plugin host to stop accepting messages in order to avoid
// hangs while the renderer is paused.
// TODO(yurys): It might be an improvement to add more plumbing to do this
// when the renderer is actually paused vs. just the debugger being attached.
// http://code.google.com/p/chromium/issues/detail?id=7556
PluginChannelHost::SetListening(false);
#endif // OS_WIN
}
void DevToolsAgent::OnDebugDetach() {
DCHECK(MessageLoop::current() == io_loop_);
if (debugger_)
debugger_->Detach();
// TODO(yurys): remove this macros once plugins available on other platforms
#if defined(OS_WIN)
PluginChannelHost::SetListening(true);
#endif // OS_WIN
}
void DevToolsAgent::OnDebugBreak(bool force) {
DCHECK(MessageLoop::current() == io_loop_);
// Set the debug break flag in the V8 engine.
debugger_->Break(force);
// If a forced break has been requested make sure that it will occour by
// running some JavaScript in the renderer.
if (force && view_loop_) {
view_loop_->PostTask(FROM_HERE, NewRunnableMethod(
this, &DevToolsAgent::EvaluateScript,
std::wstring(L"javascript:void(0)")));
}
}
void DevToolsAgent::OnDebugCommand(const std::wstring& cmd) {
DCHECK(MessageLoop::current() == io_loop_);
if (!debugger_) {
NOTREACHED();
std::wstring msg =
StringPrintf(L"before attach, ignored command (%S)", cmd.c_str());
DebuggerOutput(msg);
} else {
debugger_->Command(cmd);
}
}
void DevToolsAgent::SendMessageToClient(const std::string& raw_msg) {
Send(DevToolsClientMsg_RpcMessage(raw_msg));
}
void DevToolsAgent::OnRpcMessage(const std::string& raw_msg) {
view_loop_->PostTask(FROM_HERE, NewRunnableMethod(
this, &DevToolsAgent::DispatchRpcMessage, raw_msg));
}
void DevToolsAgent::DispatchRpcMessage(const std::string& raw_msg) {
WebDevToolsAgent* web_agent = view_->webview()->GetWebDevToolsAgent();
web_agent->DispatchMessageFromClient(raw_msg);
}
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