python_execute: fix bugs in locks
parent
9109b85e1a
commit
6c746359aa
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@ -1,18 +1,13 @@
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# 服务器组件CMakeLists.txt
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cmake_minimum_required(VERSION 3.10)
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# 查找必要的包
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find_package(Threads REQUIRED)
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# 添加源文件
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set(SERVER_SOURCES
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python_execute.cpp
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)
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# 添加库
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add_library(server STATIC ${SERVER_SOURCES})
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# 链接依赖库
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target_link_libraries(server PRIVATE mcp)
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find_package(Python3 COMPONENTS Development)
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@ -26,7 +21,6 @@ else()
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message(WARNING "Python3 development libraries not found. Python interpreter will not be available.")
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endif()
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# 包含目录
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target_include_directories(server PRIVATE
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${CMAKE_CURRENT_SOURCE_DIR}
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${CMAKE_CURRENT_SOURCE_DIR}/../
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@ -34,8 +28,7 @@ target_include_directories(server PRIVATE
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${CMAKE_CURRENT_SOURCE_DIR}/../mcp/common
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)
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# 添加MCP服务器可执行文件
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add_executable(mcp_server mcp_server_main.cpp)
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add_executable(mcp_server mcp_tool_server.cpp)
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target_link_libraries(mcp_server PRIVATE server mcp Threads::Threads ${OPENSSL_LIBRARIES})
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target_include_directories(mcp_server PRIVATE
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${CMAKE_CURRENT_SOURCE_DIR}
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@ -46,7 +39,3 @@ target_include_directories(mcp_server PRIVATE
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if(Python3_FOUND)
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target_link_libraries(mcp_server PRIVATE ${Python3_LIBRARIES})
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endif()
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# 安装
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install(TARGETS server DESTINATION lib)
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install(TARGETS mcp_server DESTINATION bin)
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@ -19,7 +19,8 @@
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extern void register_python_execute_tool(mcp::server& server);
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int main(int argc, char* argv[]) {
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int port;
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int port = 8895;
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if (argc == 2) {
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try {
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port = std::stoi(argv[1]);
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@ -27,13 +28,11 @@ int main(int argc, char* argv[]) {
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std::cerr << "Invalid port number: " << argv[1] << std::endl;
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return 1;
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}
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} else {
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port = 8818;
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}
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// Create and configure server
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mcp::server server("localhost", port);
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server.set_server_info("HumanusMCPServer", "0.0.1");
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server.set_server_info("humanus_tool", "0.1.0");
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// Set server capabilities
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mcp::json capabilities = {
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@ -1,6 +1,5 @@
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/**
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* @file python_execute.cpp
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* @brief Python execution tool implementation
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*
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* This file implements the Python execution tool, using Python.h to directly call the Python interpreter.
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*/
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@ -14,7 +13,10 @@
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#include <memory>
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#include <stdexcept>
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#include <mutex>
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#include <shared_mutex>
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#include <unordered_map>
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#include <chrono>
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#include <future>
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// Check if Python is found
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#ifdef PYTHON_FOUND
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@ -27,13 +29,15 @@
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*/
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class python_interpreter {
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private:
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// Mutex to ensure thread safety of Python interpreter
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mutable std::mutex py_mutex;
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mutable std::shared_mutex py_mutex;
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bool is_initialized;
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// Map to store Python thread states for each session
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mutable std::unordered_map<std::string, PyThreadState*> session_states;
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// Default timeout (milliseconds)
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static constexpr unsigned int DEFAULT_TIMEOUT_MS = 30000; // 30 seconds
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public:
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/**
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* @brief Constructor, initializes Python interpreter
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@ -41,6 +45,7 @@ public:
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python_interpreter() : is_initialized(false) {
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#ifdef PYTHON_FOUND
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try {
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std::unique_lock<std::shared_mutex> lock(py_mutex);
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Py_Initialize();
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if (Py_IsInitialized()) {
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is_initialized = true;
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@ -62,7 +67,7 @@ public:
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~python_interpreter() {
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#ifdef PYTHON_FOUND
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if (is_initialized) {
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std::lock_guard<std::mutex> lock(py_mutex);
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std::unique_lock<std::shared_mutex> lock(py_mutex);
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// Clean up all session states
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for (auto& pair : session_states) {
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PyThreadState_Swap(pair.second);
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@ -78,45 +83,86 @@ public:
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}
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/**
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* @brief Get or create a thread state for a session
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* @brief Check if a session exists
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* @param session_id The session identifier
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* @return PyThreadState for the session
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* @return bool indicating if session exists
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*/
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#ifdef PYTHON_FOUND
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PyThreadState* get_session_state(const std::string& session_id) const {
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std::lock_guard<std::mutex> lock(py_mutex);
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bool has_session(const std::string& session_id) const {
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std::shared_lock<std::shared_mutex> lock(py_mutex);
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return session_states.find(session_id) != session_states.end();
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}
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// Check if session already exists
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/**
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* @brief Get an existing thread state for a session
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* @param session_id The session identifier
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* @return PyThreadState for the session or nullptr if not found
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*/
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PyThreadState* get_existing_session_state(const std::string& session_id) const {
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std::shared_lock<std::shared_mutex> lock(py_mutex);
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auto it = session_states.find(session_id);
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if (it != session_states.end()) {
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return it->second;
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}
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return nullptr;
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}
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/**
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* @brief Create a new thread state for a session
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* @param session_id The session identifier
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* @return PyThreadState for the new session
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*/
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PyThreadState* create_session_state(const std::string& session_id) const {
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std::unique_lock<std::shared_mutex> lock(py_mutex);
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if (session_states.count(session_id)) return session_states[session_id];
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// Create new thread state for this session
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PyThreadState* new_state = Py_NewInterpreter();
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if (!new_state) {
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throw std::runtime_error("Failed to create new Python interpreter for session " + session_id);
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}
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// Store and return the new state
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PyEval_SaveThread(); // Release GIL after creation
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session_states[session_id] = new_state;
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return new_state;
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}
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/**
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* @brief Get or create a thread state for a session
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* @param session_id The session identifier
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* @return PyThreadState for the session
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*/
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PyThreadState* get_session_state(const std::string& session_id) const {
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// Try to get existing session state with read lock
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PyThreadState* state = get_existing_session_state(session_id);
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if (state) {
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return state;
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}
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// If it doesn't exist, create a new session (will use write lock)
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return create_session_state(session_id);
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}
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#endif
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/**
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* @brief Execute Python code in the context of a specific session
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* @brief Execute Python code in the context of a specific session with timeout
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* @param input JSON object containing Python code
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* @param session_id The session identifier
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* @return JSON object with execution results
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*/
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mcp::json forward(const mcp::json& input, const std::string& session_id) const {
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mcp::json forward(const mcp::json& input, const std::string& session_id) {
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#ifdef PYTHON_FOUND
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if (!is_initialized) {
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return mcp::json{{"error", "Python interpreter not properly initialized"}};
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}
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// Get or create session thread state
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unsigned int timeout_ms = DEFAULT_TIMEOUT_MS;
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if (input.contains("timeout_ms") && input["timeout_ms"].is_number()) {
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timeout_ms = input["timeout_ms"].get<unsigned int>();
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}
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std::packaged_task<mcp::json()> task([this, &input, session_id]() {
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mcp::json thread_result;
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PyThreadState* tstate = nullptr;
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try {
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tstate = get_session_state(session_id);
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@ -124,195 +170,92 @@ public:
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return mcp::json{{"error", e.what()}};
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}
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PyThreadState* old_state = PyThreadState_Swap(tstate);
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mcp::json result_json;
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PyEval_RestoreThread(tstate);
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try {
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if (input.contains("code") && input["code"].is_string()) {
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std::string code = input["code"].get<std::string>();
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// Get main module and dictionary
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PyObject *main_module = PyImport_AddModule("__main__");
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if (!main_module) {
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to get Python main module"}};
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}
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PyObject *main_dict = PyModule_GetDict(main_module);
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if (!main_dict) {
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to get Python main module dictionary"}};
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}
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// Import sys and io modules
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PyObject *sys_module = PyImport_ImportModule("sys");
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if (!sys_module) {
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PyErr_Print();
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to import sys module"}};
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}
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PyObject *io_module = PyImport_ImportModule("io");
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if (!io_module) {
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Py_DECREF(sys_module);
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PyErr_Print();
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to import io module"}};
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}
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// Get StringIO class
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PyObject *string_io = PyObject_GetAttrString(io_module, "StringIO");
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if (!string_io) {
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Py_DECREF(io_module);
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Py_DECREF(sys_module);
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PyErr_Print();
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to get StringIO class"}};
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}
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// Create StringIO objects
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PyObject *sys_stdout = PyObject_CallObject(string_io, nullptr);
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if (!sys_stdout) {
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Py_DECREF(string_io);
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Py_DECREF(io_module);
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Py_DECREF(sys_module);
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PyErr_Print();
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to create stdout StringIO object"}};
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}
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PyObject *sys_stderr = PyObject_CallObject(string_io, nullptr);
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if (!sys_stderr) {
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Py_DECREF(sys_stdout);
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Py_DECREF(string_io);
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Py_DECREF(io_module);
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Py_DECREF(sys_module);
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PyErr_Print();
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to create stderr StringIO object"}};
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}
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// Save original stdout and stderr
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PyObject *old_stdout = PySys_GetObject("stdout");
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PyObject *old_stderr = PySys_GetObject("stderr");
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PySys_SetObject("stdout", sys_stdout);
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PySys_SetObject("stderr", sys_stderr);
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if (old_stdout) Py_INCREF(old_stdout);
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if (old_stderr) Py_INCREF(old_stderr);
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// Replace sys.stdout and sys.stderr
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if (PySys_SetObject("stdout", sys_stdout) != 0 ||
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PySys_SetObject("stderr", sys_stderr) != 0) {
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Py_DECREF(sys_stderr);
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Py_DECREF(sys_stdout);
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Py_DECREF(string_io);
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Py_DECREF(io_module);
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Py_DECREF(sys_module);
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PyErr_Print();
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PyThreadState_Swap(old_state);
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return mcp::json{{"error", "Failed to set stdout/stderr redirection"}};
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}
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// Execute Python code
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PyObject *result = PyRun_String(code.c_str(), Py_file_input, main_dict, main_dict);
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if (!result) {
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PyErr_Print();
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}
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if (!result) PyErr_Print();
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Py_XDECREF(result);
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// Get output and errors
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PyObject *out_value = PyObject_CallMethod(sys_stdout, "getvalue", nullptr);
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PyObject *err_value = PyObject_CallMethod(sys_stderr, "getvalue", nullptr);
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std::string output, error;
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std::string output = out_value && PyUnicode_Check(out_value) ? PyUnicode_AsUTF8(out_value) : "";
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std::string error = err_value && PyUnicode_Check(err_value) ? PyUnicode_AsUTF8(err_value) : "";
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// Safely convert Python strings to C++ strings
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if (out_value && PyUnicode_Check(out_value)) {
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output = PyUnicode_AsUTF8(out_value);
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}
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if (err_value && PyUnicode_Check(err_value)) {
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error = PyUnicode_AsUTF8(err_value);
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}
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// Restore original stdout and stderr
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if (old_stdout) {
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PySys_SetObject("stdout", old_stdout);
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Py_DECREF(old_stdout);
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}
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if (old_stderr) {
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PySys_SetObject("stderr", old_stderr);
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Py_DECREF(old_stderr);
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}
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// Cleanup
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Py_XDECREF(out_value);
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Py_XDECREF(err_value);
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Py_DECREF(sys_stdout);
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Py_DECREF(sys_stderr);
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Py_DECREF(string_io);
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Py_DECREF(io_module);
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Py_DECREF(sys_module);
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// Prepare JSON output
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if (!output.empty()) {
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result_json["output"] = output;
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}
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if (!error.empty()) {
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result_json["error"] = error;
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}
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if (!output.empty()) thread_result["output"] = output;
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if (!error.empty()) thread_result["error"] = error;
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if (result_json.empty()) {
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std::string last_line;
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std::istringstream code_stream(code);
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while (std::getline(code_stream, last_line, '\n')) {}
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size_t pos = last_line.find_last_of(';') + 1;
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pos = last_line.find("=") + 1;
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while (pos < last_line.size() && isblank(last_line[pos])) {
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pos++;
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}
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if (pos != std::string::npos) {
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last_line = last_line.substr(pos);
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}
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result_json["warning"] = "No output. Maybe try with print(" + last_line + ")?";
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if (thread_result.empty()) {
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thread_result["warning"] = "No output generated. Consider using print statements.";
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}
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} else {
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result_json["error"] = "Invalid parameters or code not provided";
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thread_result["error"] = "Invalid parameters or code not provided";
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}
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} catch (const std::exception& e) {
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result_json["error"] = std::string("Python execution exception: ") + e.what();
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thread_result["error"] = std::string("Python execution exception: ") + e.what();
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}
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// Restore previous thread state
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PyThreadState_Swap(old_state);
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tstate = PyEval_SaveThread(); // Save thread state and release GIL
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return thread_result;
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});
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return result_json;
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auto future = task.get_future();
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std::thread execution_thread(std::move(task));
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if (future.wait_for(std::chrono::milliseconds(timeout_ms)) == std::future_status::timeout) {
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if (execution_thread.joinable()) execution_thread.detach(); // detach to prevent zombie threads
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return mcp::json{{"error", "Python execution timed out after " + std::to_string(timeout_ms) + "ms"}};
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}
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if (execution_thread.joinable()) execution_thread.join(); // Join thread if it's still running
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return future.get();
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#else
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return mcp::json{{"error", "Python interpreter not available"}};
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#endif
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}
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/**
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* @brief Clean up a session and remove its thread state
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* @param session_id The session identifier to clean up
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*/
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void cleanup_session(const std::string& session_id) {
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#ifdef PYTHON_FOUND
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std::lock_guard<std::mutex> lock(py_mutex);
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std::unique_lock<std::shared_mutex> lock(py_mutex);
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auto it = session_states.find(session_id);
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if (it != session_states.end()) {
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PyThreadState* old_state = PyThreadState_Swap(it->second);
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PyThreadState_Clear(it->second);
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PyThreadState_Delete(it->second);
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PyThreadState_Swap(old_state);
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PyThreadState* state = it->second;
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PyEval_RestoreThread(state);
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Py_EndInterpreter(state); // Properly end the child interpreter
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session_states.erase(it);
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PyEval_SaveThread(); // Restore the main thread's GIL release state
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}
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#endif
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}
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};
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// Global Python interpreter instance
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@ -325,7 +268,7 @@ mcp::json python_execute_handler(const mcp::json& args, const std::string& sessi
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}
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try {
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// Use Python interpreter to execute code with session context
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// Use Python interpreter to execute code with session context and timeout
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mcp::json result = interpreter.forward(args, session_id);
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return {{
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@ -341,8 +284,9 @@ mcp::json python_execute_handler(const mcp::json& args, const std::string& sessi
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// Register the PythonExecute tool
|
||||
void register_python_execute_tool(mcp::server& server) {
|
||||
mcp::tool python_tool = mcp::tool_builder("python_execute")
|
||||
.with_description("Execute Python code and return the result")
|
||||
.with_string_param("code", "The Python code to execute", true)
|
||||
.with_description("Executes Python code string. Note: Only print outputs are visible, function return values are not captured. Use print statements to see results.")
|
||||
.with_string_param("code", "The Python code to execute. Note: Use absolute file paths if code will read/write files.", true)
|
||||
.with_number_param("timeout_ms", "Timeout in milliseconds for code execution (default: 30000)", false)
|
||||
.build();
|
||||
|
||||
server.register_tool(python_tool, python_execute_handler);
|
||||
|
|
|
|||
Loading…
Reference in New Issue