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86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2025 Johannes Pohl
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This program 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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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#pragma once
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// local headers
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#include "asio_stream.hpp"
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#include "watchdog.hpp"
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// 3rd party headers
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// standard headers
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#include <memory>
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#include <string>
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namespace bp = boost::process;
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namespace streamreader
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{
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using boost::asio::posix::stream_descriptor;
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/// Starts an external process and reads and PCM data from stdout
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/**
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* Starts an external process, reads PCM data from stdout, and passes the data to an encoder.
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* Implements EncoderListener to get the encoded data.
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* Data is passed to the PcmStream::Listener
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*/
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class ProcessStream : public AsioStream<stream_descriptor>
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{
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public:
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/// c'tor. Encoded PCM data is passed to the PipeListener
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ProcessStream(PcmStream::Listener* pcmListener, boost::asio::io_context& ioc, const ServerSettings& server_settings, const StreamUri& uri);
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/// d'tor
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~ProcessStream() override = default;
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protected:
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void connect() override;
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void disconnect() override;
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std::string exe_; ///< filename of the process
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std::string path_; ///< base path of the provess
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std::string params_; ///< parameters for the process
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bp::pipe pipe_stdout_; ///< stdout of the process
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bp::pipe pipe_stderr_; ///< stderr of the process
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bp::child process_; ///< the process
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bool logStderr_; ///< log stderr to log?
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boost::asio::streambuf streambuf_stderr_; ///< stderr read buffer
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std::unique_ptr<stream_descriptor> stream_stderr_; ///< stderr stream
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/// Read async from stderr
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virtual void stderrReadLine();
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/// Called for a line read from stderr
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virtual void onStderrMsg(const std::string& line);
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/// Try to find exe and base path, throw on error
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virtual void initExeAndPath(const std::string& filename);
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/// @return the executables complete path to @p filename
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std::string findExe(const std::string& filename) const;
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size_t wd_timeout_sec_; ///< Watchdog timeout for arrival of new log lines
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std::unique_ptr<Watchdog> watchdog_; ///< the watchdog
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/// called on wd timeout, kills the process
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void onTimeout(std::chrono::milliseconds ms);
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};
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} // namespace streamreader
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