07-daytime3.cpp
2.19 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
//
// server.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <ctime>
#include <iostream>
#include <string>
#include <asio.hpp>
using asio::ip::tcp;
std::string make_daytime_string()
{
using namespace std; // For time_t, time and ctime;
time_t now = time(0);
return ctime(&now);
}
class tcp_connection
: public std::enable_shared_from_this<tcp_connection>
{
public:
typedef std::shared_ptr<tcp_connection> pointer;
static pointer create(asio::io_context& io_context)
{
return pointer(new tcp_connection(io_context));
}
tcp::socket& socket()
{
return socket_;
}
void start()
{
message_ = make_daytime_string();
asio::async_write(socket_, asio::buffer(message_),
std::bind(&tcp_connection::handle_write, shared_from_this(),
std::placeholders::_1,
std::placeholders::_2));
}
private:
tcp_connection(asio::io_context& io_context)
: socket_(io_context)
{
}
void handle_write(const asio::error_code& /*error*/,
size_t /*bytes_transferred*/)
{
}
tcp::socket socket_;
std::string message_;
};
class tcp_server
{
public:
tcp_server(asio::io_context& io_context)
: io_context_(io_context),
acceptor_(io_context, tcp::endpoint(tcp::v4(), 13))
{
start_accept();
}
private:
void start_accept()
{
tcp_connection::pointer new_connection =
tcp_connection::create(io_context_);
acceptor_.async_accept(new_connection->socket(),
std::bind(&tcp_server::handle_accept, this, new_connection,
std::placeholders::_1));
}
void handle_accept(tcp_connection::pointer new_connection,
const asio::error_code& error)
{
if (!error)
{
new_connection->start();
}
start_accept();
}
asio::io_context& io_context_;
tcp::acceptor acceptor_;
};
int main()
{
try
{
asio::io_context io_context;
tcp_server server(io_context);
io_context.run();
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
return 0;
}