Refactored namespaces
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emeric
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/*
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* Copyright (C) 2020 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ChildProcess.hpp"
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#include <cstring>
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#include <cerrno>
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#include <fcntl.h>
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#include <stdexcept>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <unistd.h>
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#include <algorithm>
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#include <iostream>
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#include <mutex>
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#include <boost/asio/read.hpp>
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#include <boost/asio/buffer.hpp>
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#include "core/Exception.hpp"
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#include "core/ILogger.hpp"
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namespace lms::core
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{
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namespace
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{
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class SystemException : public ChildProcessException
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{
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public:
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SystemException(int err, const std::string& errMsg)
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: ChildProcessException{ errMsg + ": " + ::strerror(err) }
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{}
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SystemException(boost::system::error_code ec, const std::string& errMsg)
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: ChildProcessException{ errMsg + ": " + ec.message() }
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{}
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};
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}
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ChildProcess::ChildProcess(boost::asio::io_context& ioContext, const std::filesystem::path& path, const Args& args)
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: _ioContext{ ioContext }
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, _childStdout{ _ioContext }
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{
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// make sure only one thread is executing this part of code
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static std::mutex mutex;
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std::unique_lock<std::mutex> lock{ mutex };
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int pipe[2];
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int res{ pipe2(pipe, O_NONBLOCK | O_CLOEXEC) };
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if (res < 0)
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throw SystemException{ errno, "pipe2 failed!" };
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{
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#if defined(__linux__) && defined(F_SETPIPE_SZ)
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// Just a hint here to prevent the writer from writing too many bytes ahead of the reader
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constexpr std::size_t pipeSize{ 65536 * 4 };
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if (fcntl(pipe[0], F_SETPIPE_SZ, pipeSize) == -1)
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throw SystemException{ errno, "fcntl failed!" };
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if (fcntl(pipe[1], F_SETPIPE_SZ, pipeSize) == -1)
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throw SystemException{ errno, "fcntl failed!" };
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#endif
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}
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res = fork();
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if (res == -1)
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throw SystemException{ errno, "fork failed!" };
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if (res == 0) // CHILD
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{
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close(pipe[0]);
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close(STDIN_FILENO);
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close(STDERR_FILENO);
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// Replace stdout with pipe write
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if (dup2(pipe[1], STDOUT_FILENO) == -1)
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exit(-1);
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std::vector<const char*> execArgs;
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std::transform(std::cbegin(args), std::cend(args), std::back_inserter(execArgs), [](const std::string& arg) { return arg.c_str(); });
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execArgs.push_back(nullptr);
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res = execv(path.string().c_str(), (char* const*)&execArgs[0]);
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if (res == -1)
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exit(-1);
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}
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else // PARENT
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{
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close(pipe[1]);
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{
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boost::system::error_code assignError;
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_childStdout.assign(pipe[0], assignError);
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if (assignError)
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throw SystemException{ assignError, "fork failed!" };
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}
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_childPID = res;
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}
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}
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ChildProcess::~ChildProcess()
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{
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LMS_LOG(CHILDPROCESS, DEBUG, "Closing child process...");
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{
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boost::system::error_code closeError;
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_childStdout.close(closeError);
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if (closeError)
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LMS_LOG(CHILDPROCESS, ERROR, "Closed failed: " << closeError.message());
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}
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if (!_finished)
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kill();
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wait(true);
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}
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void ChildProcess::kill()
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{
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// process may already have finished
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LMS_LOG(CHILDPROCESS, DEBUG, "Killing child process...");
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if (::kill(_childPID, SIGKILL) == -1)
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LMS_LOG(CHILDPROCESS, DEBUG, "Kill failed: " << ::strerror(errno));
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}
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bool ChildProcess::wait(bool block)
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{
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assert(!_waited);
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int wstatus{};
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const pid_t pid{ waitpid(_childPID, &wstatus, block ? 0 : WNOHANG) };
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if (pid == -1)
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throw SystemException{ errno, "waitpid failed!" };
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else if (pid == 0)
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return false;
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if (WIFEXITED(wstatus))
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{
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_exitCode = WEXITSTATUS(wstatus);
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LMS_LOG(CHILDPROCESS, DEBUG, "Exit code = " << *_exitCode);
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}
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_waited = true;
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return true;
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}
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void ChildProcess::asyncRead(std::byte* data, std::size_t bufferSize, ReadCallback callback)
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{
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assert(!finished());
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LMS_LOG(CHILDPROCESS, DEBUG, "Async read, bufferSize = " << bufferSize);
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boost::asio::async_read(_childStdout, boost::asio::buffer(data, bufferSize),
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[this, callback{ std::move(callback) }](const boost::system::error_code& error, std::size_t bytesTransferred)
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{
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LMS_LOG(CHILDPROCESS, DEBUG, "Async read cb - ec = '" << error.message() << "' (" << error.value() << "), bytesTransferred = " << bytesTransferred);
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ReadResult readResult{ ReadResult::Success };
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if (error)
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{
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if (error != boost::asio::error::eof)
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{
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// forbidden to read any captured param here as the ChildProcess instance may already have been killed
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return;
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}
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readResult = ReadResult::EndOfFile;
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_finished = true;
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}
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callback(readResult, bytesTransferred);
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});
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}
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std::size_t ChildProcess::readSome(std::byte* data, std::size_t bufferSize)
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{
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boost::system::error_code ec;
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const std::size_t res{ _childStdout.read_some(boost::asio::buffer(data, bufferSize), ec) };
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LMS_LOG(CHILDPROCESS, DEBUG, "read some " << res << " bytes, ec = " << ec.message());
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if (ec)
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_childStdout.close(ec);
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return res;
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}
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bool ChildProcess::finished() const
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{
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return _finished;
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}
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}
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