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//===- ProtocolServerMCP.cpp ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ProtocolServerMCP.h"
#include "Resource.h"
#include "Tool.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Protocol/MCP/Server.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Threading.h"
#include <thread>
using namespace lldb_private;
using namespace lldb_private::mcp;
using namespace lldb_protocol::mcp;
using namespace llvm;
LLDB_PLUGIN_DEFINE(ProtocolServerMCP)
static constexpr llvm::StringLiteral kName = "lldb-mcp";
static constexpr llvm::StringLiteral kVersion = "0.1.0";
ProtocolServerMCP::ProtocolServerMCP() : ProtocolServer() {}
ProtocolServerMCP::~ProtocolServerMCP() { llvm::consumeError(Stop()); }
void ProtocolServerMCP::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance);
}
void ProtocolServerMCP::Terminate() {
if (llvm::Error error = ProtocolServer::Terminate())
LLDB_LOG_ERROR(GetLog(LLDBLog::Host), std::move(error), "{0}");
PluginManager::UnregisterPlugin(CreateInstance);
}
lldb::ProtocolServerUP ProtocolServerMCP::CreateInstance() {
return std::make_unique<ProtocolServerMCP>();
}
llvm::StringRef ProtocolServerMCP::GetPluginDescriptionStatic() {
return "MCP Server.";
}
void ProtocolServerMCP::Extend(lldb_protocol::mcp::Server &server) const {
server.AddNotificationHandler("notifications/initialized",
[](const lldb_protocol::mcp::Notification &) {
LLDB_LOG(GetLog(LLDBLog::Host),
"MCP initialization complete");
});
server.AddTool(
std::make_unique<CommandTool>("command", "Run an lldb command."));
server.AddTool(std::make_unique<DebuggerListTool>(
"debugger_list", "List debugger instances with their debugger_id."));
server.AddResourceProvider(std::make_unique<DebuggerResourceProvider>());
}
void ProtocolServerMCP::AcceptCallback(std::unique_ptr<Socket> socket) {
Log *log = GetLog(LLDBLog::Host);
std::string client_name = llvm::formatv("client_{0}", ++m_client_count);
LLDB_LOG(log, "New MCP client connected: {0}", client_name);
lldb::IOObjectSP io_sp = std::move(socket);
auto transport_up = std::make_unique<lldb_protocol::mcp::Transport>(
io_sp, io_sp, [client_name](llvm::StringRef message) {
LLDB_LOG(GetLog(LLDBLog::Host), "{0}: {1}", client_name, message);
});
MCPTransport *transport_ptr = transport_up.get();
auto instance_up = std::make_unique<lldb_protocol::mcp::Server>(
std::string(kName), std::string(kVersion), *transport_up,
/*log_callback=*/
[client_name](llvm::StringRef message) {
LLDB_LOG(GetLog(LLDBLog::Host), "{0} Server: {1}", client_name,
message);
},
/*closed_callback=*/
[this, transport_ptr]() { m_instances.erase(transport_ptr); });
Extend(*instance_up);
llvm::Expected<MainLoop::ReadHandleUP> handle =
transport_up->RegisterMessageHandler(m_loop, *instance_up);
if (!handle) {
LLDB_LOG_ERROR(log, handle.takeError(), "Failed to run MCP server: {0}");
return;
}
m_instances[transport_ptr] =
std::make_tuple<ServerUP, ReadHandleUP, TransportUP>(
std::move(instance_up), std::move(*handle), std::move(transport_up));
}
llvm::Error ProtocolServerMCP::Start(ProtocolServer::Connection connection) {
std::lock_guard<std::mutex> guard(m_mutex);
if (m_running)
return llvm::createStringError("the MCP server is already running");
Status status;
m_listener = Socket::Create(connection.protocol, status);
if (status.Fail())
return status.takeError();
status = m_listener->Listen(connection.name, /*backlog=*/5);
if (status.Fail())
return status.takeError();
auto handles =
m_listener->Accept(m_loop, std::bind(&ProtocolServerMCP::AcceptCallback,
this, std::placeholders::_1));
if (llvm::Error error = handles.takeError())
return error;
auto listening_uris = m_listener->GetListeningConnectionURI();
if (listening_uris.empty())
return createStringError("failed to get listening connections");
std::string address =
llvm::join(m_listener->GetListeningConnectionURI(), ", ");
ServerInfo info{listening_uris[0]};
llvm::Expected<ServerInfoHandle> handle = ServerInfo::Write(info);
if (!handle)
return handle.takeError();
m_running = true;
m_server_info_handle = std::move(*handle);
m_listen_handlers = std::move(*handles);
m_loop_thread = std::thread([=] {
llvm::set_thread_name("protocol-server.mcp");
m_loop.Run();
});
return llvm::Error::success();
}
llvm::Error ProtocolServerMCP::Stop() {
{
std::lock_guard<std::mutex> guard(m_mutex);
if (!m_running)
return createStringError("the MCP sever is not running");
m_running = false;
}
// Stop the main loop.
m_loop.AddPendingCallback(
[](lldb_private::MainLoopBase &loop) { loop.RequestTermination(); });
// Wait for the main loop to exit.
if (m_loop_thread.joinable())
m_loop_thread.join();
m_server_info_handle.Remove();
m_listen_handlers.clear();
m_instances.clear();
return llvm::Error::success();
}
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