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1 | // |
2 | // echo_server.cpp | |
3 | // ~~~~~~~~~~~~~~~ | |
4 | // | |
b32b8144 | 5 | // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
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6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
b32b8144 | 11 | #include <boost/asio/io_context.hpp> |
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12 | #include <boost/asio/ip/tcp.hpp> |
13 | #include <boost/asio/spawn.hpp> | |
14 | #include <boost/asio/steady_timer.hpp> | |
15 | #include <boost/asio/write.hpp> | |
16 | #include <iostream> | |
17 | #include <memory> | |
18 | ||
19 | using boost::asio::ip::tcp; | |
20 | ||
21 | class session : public std::enable_shared_from_this<session> | |
22 | { | |
23 | public: | |
24 | explicit session(tcp::socket socket) | |
25 | : socket_(std::move(socket)), | |
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26 | timer_(socket_.get_io_context()), |
27 | strand_(socket_.get_io_context()) | |
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28 | { |
29 | } | |
30 | ||
31 | void go() | |
32 | { | |
33 | auto self(shared_from_this()); | |
34 | boost::asio::spawn(strand_, | |
35 | [this, self](boost::asio::yield_context yield) | |
36 | { | |
37 | try | |
38 | { | |
39 | char data[128]; | |
40 | for (;;) | |
41 | { | |
42 | timer_.expires_from_now(std::chrono::seconds(10)); | |
43 | std::size_t n = socket_.async_read_some(boost::asio::buffer(data), yield); | |
44 | boost::asio::async_write(socket_, boost::asio::buffer(data, n), yield); | |
45 | } | |
46 | } | |
47 | catch (std::exception& e) | |
48 | { | |
49 | socket_.close(); | |
50 | timer_.cancel(); | |
51 | } | |
52 | }); | |
53 | ||
54 | boost::asio::spawn(strand_, | |
55 | [this, self](boost::asio::yield_context yield) | |
56 | { | |
57 | while (socket_.is_open()) | |
58 | { | |
59 | boost::system::error_code ignored_ec; | |
60 | timer_.async_wait(yield[ignored_ec]); | |
61 | if (timer_.expires_from_now() <= std::chrono::seconds(0)) | |
62 | socket_.close(); | |
63 | } | |
64 | }); | |
65 | } | |
66 | ||
67 | private: | |
68 | tcp::socket socket_; | |
69 | boost::asio::steady_timer timer_; | |
b32b8144 | 70 | boost::asio::io_context::strand strand_; |
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71 | }; |
72 | ||
73 | int main(int argc, char* argv[]) | |
74 | { | |
75 | try | |
76 | { | |
77 | if (argc != 2) | |
78 | { | |
79 | std::cerr << "Usage: echo_server <port>\n"; | |
80 | return 1; | |
81 | } | |
82 | ||
b32b8144 | 83 | boost::asio::io_context io_context; |
7c673cae | 84 | |
b32b8144 | 85 | boost::asio::spawn(io_context, |
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86 | [&](boost::asio::yield_context yield) |
87 | { | |
b32b8144 | 88 | tcp::acceptor acceptor(io_context, |
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89 | tcp::endpoint(tcp::v4(), std::atoi(argv[1]))); |
90 | ||
91 | for (;;) | |
92 | { | |
93 | boost::system::error_code ec; | |
b32b8144 | 94 | tcp::socket socket(io_context); |
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95 | acceptor.async_accept(socket, yield[ec]); |
96 | if (!ec) std::make_shared<session>(std::move(socket))->go(); | |
97 | } | |
98 | }); | |
99 | ||
b32b8144 | 100 | io_context.run(); |
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101 | } |
102 | catch (std::exception& e) | |
103 | { | |
104 | std::cerr << "Exception: " << e.what() << "\n"; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } |