| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <memory> |
| #include <string> |
| #include <filesystem> |
| |
| #include "LuaScriptEngine.h" |
| #include "LuaProcessSession.h" |
| #include "LuaScriptProcessContext.h" |
| #include "utils/StringUtils.h" |
| |
| namespace org::apache::nifi::minifi::extensions::lua { |
| |
| |
| LuaScriptEngine::LuaScriptEngine() { |
| lua_.open_libraries(sol::lib::base, |
| sol::lib::os, |
| sol::lib::coroutine, |
| sol::lib::math, |
| sol::lib::io, |
| sol::lib::string, |
| sol::lib::table, |
| sol::lib::utf8, |
| sol::lib::package); |
| lua_.new_usertype<core::logging::Logger>( |
| "Logger", |
| "info", &core::logging::Logger::log_info<>); |
| lua_.new_usertype<LuaProcessSession>( |
| "ProcessSession", |
| "create", static_cast<std::shared_ptr<LuaScriptFlowFile> (LuaProcessSession::*)()>(&LuaProcessSession::create), |
| "get", &LuaProcessSession::get, |
| "read", &LuaProcessSession::read, |
| "write", &LuaProcessSession::write, |
| "transfer", &LuaProcessSession::transfer, |
| "remove", &LuaProcessSession::remove); |
| lua_.new_usertype<LuaScriptFlowFile>( |
| "FlowFile", |
| "getAttribute", &LuaScriptFlowFile::getAttribute, |
| "addAttribute", &LuaScriptFlowFile::addAttribute, |
| "removeAttribute", &LuaScriptFlowFile::removeAttribute, |
| "updateAttribute", &LuaScriptFlowFile::updateAttribute, |
| "setAttribute", &LuaScriptFlowFile::setAttribute); |
| lua_.new_usertype<LuaInputStream>( |
| "InputStream", |
| "read", &LuaInputStream::read); |
| lua_.new_usertype<LuaOutputStream>( |
| "OutputStream", |
| "write", &LuaOutputStream::write); |
| lua_.new_usertype<LuaScriptProcessContext>( |
| "ProcessContext", |
| "getStateManager", &LuaScriptProcessContext::getStateManager); |
| lua_.new_usertype<LuaScriptStateManager>( |
| "StateManager", |
| "set", &LuaScriptStateManager::set, |
| "get", &LuaScriptStateManager::get); |
| } |
| |
| void LuaScriptEngine::executeScriptWithAppendedModulePaths(std::string& script) { |
| for (const auto& module_path : module_paths_) { |
| if (std::filesystem::is_regular_file(std::filesystem::status(module_path))) { |
| script = utils::StringUtils::join_pack("package.path = package.path .. [[;", module_path.string(), "]]\n", script); |
| } else { |
| script = utils::StringUtils::join_pack("package.path = package.path .. [[;", module_path.string(), "/?.lua]]\n", script); |
| } |
| } |
| lua_.script(script, sol::script_throw_on_error); |
| } |
| |
| void LuaScriptEngine::eval(const std::string& script) { |
| try { |
| if (!module_paths_.empty()) { |
| auto appended_script = script; |
| executeScriptWithAppendedModulePaths(appended_script); |
| } else { |
| lua_.script(script, sol::script_throw_on_error); |
| } |
| } catch (std::exception& e) { |
| throw LuaScriptException(e.what()); |
| } |
| } |
| |
| void LuaScriptEngine::evalFile(const std::filesystem::path& file_name) { |
| try { |
| if (!module_paths_.empty()) { |
| std::ifstream stream(file_name); |
| std::string script((std::istreambuf_iterator<char>(stream)), std::istreambuf_iterator<char>()); |
| executeScriptWithAppendedModulePaths(script); |
| } else { |
| lua_.script_file(file_name.string(), sol::script_throw_on_error); |
| } |
| } catch (std::exception& e) { |
| throw LuaScriptException(e.what()); |
| } |
| } |
| |
| void LuaScriptEngine::initialize(const core::Relationship& success, const core::Relationship& failure, const std::shared_ptr<core::logging::Logger>& logger) { |
| bind("log", logger); |
| bind("REL_SUCCESS", success); |
| bind("REL_FAILURE", failure); |
| } |
| |
| namespace { |
| class TriggerSession { |
| public: |
| TriggerSession(std::shared_ptr<LuaScriptProcessContext> script_context, |
| std::shared_ptr<LuaProcessSession> lua_session) |
| : script_context_(std::move(script_context)), |
| lua_session_(std::move(lua_session)) { |
| } |
| |
| ~TriggerSession() { |
| script_context_->releaseProcessContext(); |
| lua_session_->releaseCoreResources(); |
| } |
| |
| private: |
| std::shared_ptr<LuaScriptProcessContext> script_context_; |
| std::shared_ptr<LuaProcessSession> lua_session_; |
| }; |
| } // namespace |
| |
| void LuaScriptEngine::onTrigger(const std::shared_ptr<core::ProcessContext>& context, const std::shared_ptr<core::ProcessSession>& session) { |
| auto script_context = std::make_shared<LuaScriptProcessContext>(context, lua_); |
| auto lua_session = std::make_shared<LuaProcessSession>(session); |
| TriggerSession trigger_session(script_context, lua_session); |
| call("onTrigger", script_context, lua_session); |
| } |
| |
| } // namespace org::apache::nifi::minifi::extensions::lua |