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// Copyright (c) 2014 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "atom/browser/node_debugger.h"
#include <string>
#include "base/bind.h"
#include "base/command_line.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "content/public/browser/browser_thread.h"
#include "net/test/embedded_test_server/tcp_listen_socket.h"
#include "atom/common/node_includes.h"
namespace atom {
namespace {
// NodeDebugger is stored in Isolate's data, slots 0, 1, 3 have already been
// taken by gin, blink and node, using 2 is a safe option for now.
const int kIsolateSlot = 2;
const char* kContentLength = "Content-Length";
} // namespace
NodeDebugger::NodeDebugger(v8::Isolate* isolate)
: isolate_(isolate),
thread_("NodeDebugger"),
content_length_(-1),
weak_factory_(this) {
bool use_debug_agent = false;
int port = 5858;
std::string port_str;
base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
if (cmd->HasSwitch("debug")) {
use_debug_agent = true;
port_str = cmd->GetSwitchValueASCII("debug");
} else if (cmd->HasSwitch("debug-brk")) {
use_debug_agent = true;
port_str = cmd->GetSwitchValueASCII("debug-brk");
}
if (use_debug_agent) {
if (!port_str.empty())
base::StringToInt(port_str, &port);
isolate_->SetData(kIsolateSlot, this);
v8::Debug::SetMessageHandler(isolate_, DebugMessageHandler);
weak_up_ui_handle_.data = this;
uv_async_init(uv_default_loop(), &weak_up_ui_handle_, ProcessMessageInUI);
// Start a new IO thread.
base::Thread::Options options;
options.message_loop_type = base::MessageLoop::TYPE_IO;
if (!thread_.StartWithOptions(options)) {
LOG(ERROR) << "Unable to start debugger thread";
return;
}
// Start the server in new IO thread.
thread_.task_runner()->PostTask(
FROM_HERE,
base::Bind(&NodeDebugger::StartServer, weak_factory_.GetWeakPtr(),
port));
}
}
NodeDebugger::~NodeDebugger() {
thread_.Stop();
}
bool NodeDebugger::IsRunning() const {
return thread_.IsRunning();
}
void NodeDebugger::StartServer(int port) {
server_ = net::test_server::TCPListenSocket::CreateAndListen(
"127.0.0.1", port, this);
if (!server_) {
LOG(ERROR) << "Cannot start debugger server";
return;
}
}
void NodeDebugger::CloseSession() {
accepted_socket_.reset();
}
void NodeDebugger::OnMessage(const std::string& message) {
if (message.find("\"type\":\"request\",\"command\":\"disconnect\"}") !=
std::string::npos)
CloseSession();
base::string16 message16 = base::UTF8ToUTF16(message);
v8::Debug::SendCommand(
isolate_,
reinterpret_cast<const uint16_t*>(message16.data()), message16.size());
uv_async_send(&weak_up_ui_handle_);
}
void NodeDebugger::SendMessage(const std::string& message) {
if (accepted_socket_) {
std::string header = base::StringPrintf(
"%s: %d\r\n\r\n", kContentLength, static_cast<int>(message.size()));
accepted_socket_->Send(header);
accepted_socket_->Send(message);
}
}
void NodeDebugger::SendConnectMessage() {
accepted_socket_->Send(base::StringPrintf(
"Type: connect\r\n"
"V8-Version: %s\r\n"
"Protocol-Version: 1\r\n"
"Embedding-Host: %s\r\n"
"%s: 0\r\n",
v8::V8::GetVersion(), ATOM_PRODUCT_NAME, kContentLength), true);
}
// static
void NodeDebugger::ProcessMessageInUI(uv_async_t* handle) {
NodeDebugger* self = static_cast<NodeDebugger*>(handle->data);
v8::Debug::ProcessDebugMessages(self->isolate_);
}
// static
void NodeDebugger::DebugMessageHandler(const v8::Debug::Message& message) {
NodeDebugger* self = static_cast<NodeDebugger*>(
message.GetIsolate()->GetData(kIsolateSlot));
if (self) {
std::string message8(*v8::String::Utf8Value(message.GetJSON()));
self->thread_.task_runner()->PostTask(
FROM_HERE,
base::Bind(&NodeDebugger::SendMessage, self->weak_factory_.GetWeakPtr(),
message8));
}
}
void NodeDebugger::DidAccept(
net::test_server::StreamListenSocket* server,
std::unique_ptr<net::test_server::StreamListenSocket> socket) {
// Only accept one session.
if (accepted_socket_) {
socket->Send(std::string("Remote debugging session already active"), true);
return;
}
accepted_socket_ = std::move(socket);
SendConnectMessage();
}
void NodeDebugger::DidRead(net::test_server::StreamListenSocket* socket,
const char* data,
int len) {
buffer_.append(data, len);
do {
if (buffer_.size() == 0)
return;
// Read the "Content-Length" header.
if (content_length_ < 0) {
size_t pos = buffer_.find("\r\n\r\n");
if (pos == std::string::npos)
return;
// We can be sure that the header is "Content-Length: xxx\r\n".
std::string content_length = buffer_.substr(16, pos - 16);
if (!base::StringToInt(content_length, &content_length_)) {
DidClose(accepted_socket_.get());
return;
}
// Strip header from buffer.
buffer_ = buffer_.substr(pos + 4);
}
// Read the message.
if (buffer_.size() >= static_cast<size_t>(content_length_)) {
std::string message = buffer_.substr(0, content_length_);
buffer_ = buffer_.substr(content_length_);
OnMessage(message);
// Get ready for next message.
content_length_ = -1;
}
} while (true);
}
void NodeDebugger::DidClose(net::test_server::StreamListenSocket* socket) {
// If we lost the connection, then simulate a disconnect msg:
OnMessage("{\"seq\":1,\"type\":\"request\",\"command\":\"disconnect\"}");
}
} // namespace atom