1 /*
2  * Copyright (C) 2020 Emeric Poupon
3  *
4  * This file is part of LMS.
5  *
6  * LMS is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * LMS is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
18  */
19 #pragma once
20 
21 #include <cstddef>
22 #include <functional>
23 #include <string>
24 #include <vector>
25 
26 #include "utils/Exception.hpp"
27 
28 class ChildProcessException : public LmsException
29 {
30 	public:
31 		using LmsException::LmsException;
32 };
33 
34 class IChildProcess
35 {
36 	public:
37 		using Args = std::vector<std::string>;
38 
39 		virtual ~IChildProcess() = default;
40 
41 		enum class ReadResult
42 		{
43 			Success,
44 			Error,
45 			EndOfFile,
46 		};
47 
48 		using ReadCallback = std::function<void(ReadResult, std::size_t)>;
49 		virtual void		asyncRead(std::byte* data, std::size_t bufferSize, ReadCallback callback) = 0;
50 
51 		using WaitCallback = std::function<void(void)>;
52 		virtual void		asyncWaitForData(WaitCallback cb) = 0;
53 		virtual std::size_t	readSome(std::byte* data, std::size_t bufferSize) = 0;
54 		virtual bool		finished() = 0;
55 };
56 
57