HTML Diff chat/chat

src/examples/cpp03/chat/chat_client.cpp		src/examples/cpp11/chat/chat_client.cpp
⋮		⋮
1	//	1	//
2	//·chat_client.cpp	2	//·chat_client.cpp
3	//·~~~~~~~~~~~~~~~	3	//·~~~~~~~~~~~~~~~
4	//	4	//
5	//·Copyright·(c)·2003-2021·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com)	5	//·Copyright·(c)·2003-2021·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com)
6	//	6	//
7	//·Distributed·under·the·Boost·Software·License,·Version·1.0.·(See·accompanying	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)	8	//·file·LICENSE_1_0.txt·or·copy·at·http://www.boost.org/LICENSE_1_0.txt)
9	//	9	//
10		10
11	#include·<cstdlib>	11	#include·<cstdlib>
12	#include·<deque>	12	#include·<deque>
13	#include·<iostream>	13	#include·<iostream>
14	#include·<boost/bind/bind.hpp>	14	#include·<thread>
15	#include·"asio.hpp"	15	#include·"asio.hpp"
16	#include·"chat_message.hpp"	16	#include·"chat_message.hpp"
17		17
18	using·asio::ip::tcp;	18	using·asio::ip::tcp;
19		19
20	typedef·std::deque<chat_message>·chat_message_queue;	20	typedef·std::deque<chat_message>·chat_message_queue;
21		21
22	class·chat_client	22	class·chat_client
23	{	23	{
24	public:	24	public:
25	··chat_client(asio::io_context&·io_context,	25	··chat_client(asio::io_context&·io_context,
26	······const·tcp::resolver::results_type&·endpoints)	26	······const·tcp::resolver::results_type&·endpoints)
27	····:·io_context_(io_context),	27	····:·io_context_(io_context),
28	······socket_(io_context)	28	······socket_(io_context)
29	··{	29	··{
30	····asio::async_connect(socket_,·endpoints,	30	····do_connect(endpoints);
31	········boost::bind(&chat_client::handle_connect,·this,
32	··········asio::placeholders::error));
33	··}	31	··}
34		32
35	··void·write(const·chat_message&·msg)	33	··void·write(const·chat_message&·msg)
36	··{	34	··{
37	····asio::post(io_context_,	35	····asio::post(io_context_,
38	········boost::bind(&chat_client::do_write,·this,·msg));	36	········[this,·msg]()
		37	········{
		38	··········bool·write_in_progress·=·!write_msgs_.empty();
		39	··········write_msgs_.push_back(msg);
		40	··········if·(!write_in_progress)
		41	··········{
		42	············do_write();
		43	··········}
		44	········});
39	··}	45	··}
40		46
41	··void·close()	47	··void·close()
42	··{	48	··{
43	····asio::post(io_context_,	49	····asio::post(io_context_,·[this]()·{·socket_.close();·});
44	········boost::bind(&chat_client::do_close,·this));
45	··}	50	··}
46		51
47	private:	52	private:
48		53	··void·do_connect(const·tcp::resolver::results_type&·endpoints)
49	··void·handle_connect(const·asio::error_code&·error)
50	··{
51	····if·(!error)
52	····{
53	······asio::async_read(socket_,
54	··········asio::buffer(read_msg_.data(),·chat_message::header_length),
55	··········boost::bind(&chat_client::handle_read_header,·this,
56	············asio::placeholders::error));
57	····}
58	··}
59
60	··void·handle_read_header(const·asio::error_code&·error)
61	··{
62	····if·(!error·&&·read_msg_.decode_header())
63	····{
64	······asio::async_read(socket_,
65	··········asio::buffer(read_msg_.body(),·read_msg_.body_length()),
66	··········boost::bind(&chat_client::handle_read_body,·this,
67	············asio::placeholders::error));
68	····}
69	····else
70	····{
71	······do_close();
72	····}
73	··}
74
75	··void·handle_read_body(const·asio::error_code&·error)
76	··{
77	····if·(!error)
78	····{
79	······std::cout.write(read_msg_.body(),·read_msg_.body_length());
80	······std::cout·<<·"\n";
81	······asio::async_read(socket_,
82	··········asio::buffer(read_msg_.data(),·chat_message::header_length),
83	··········boost::bind(&chat_client::handle_read_header,·this,
84	············asio::placeholders::error));
85	····}
86	····else
87	····{
88	······do_close();
89	····}
90	··}
91
92	··void·do_write(chat_message·msg)
93	··{
94	····bool·write_in_progress·=·!write_msgs_.empty();
95	····write_msgs_.push_back(msg);
96	····if·(!write_in_progress)
97	····{
98	······asio::async_write(socket_,
99	··········asio::buffer(write_msgs_.front().data(),
100	············write_msgs_.front().length()),
101	··········boost::bind(&chat_client::handle_write,·this,
102	············asio::placeholders::error));
103	····}
104	··}
105
106	··void·handle_write(const·asio::error_code&·error)
107	··{	54	··{
108	····if·(!error)	55	····asio::async_connect(socket_,·endpoints,
109	····{	56	········[this](std::error_code·ec,·tcp::endpoint)
110	······write_msgs_.pop_front();	57	········{
111	······if·(!write_msgs_.empty())	58	··········if·(!ec)
112	······{	59	··········{
113	········asio::async_write(socket_,	60	············do_read_header();
114	············asio::buffer(write_msgs_.front().data(),	61	··········}
115	··············write_msgs_.front().length()),	62	········});
116	············boost::bind(&chat_client::handle_write,·this,	63	··}
117	··············asio::placeholders::error));	64
118	······}	65	··void·do_read_header()
119	····}	66	··{
120	····else	67	····asio::async_read(socket_,
121	····{	68	········asio::buffer(read_msg_.data(),·chat_message::header_length),
122	······do_close();	69	········[this](std::error_code·ec,·std::size_t·/length/)
123	····}	70	········{
124	··}	71	··········if·(!ec·&&·read_msg_.decode_header())
125		72	··········{
126	··void·do_close()	73	············do_read_body();
127	··{	74	··········}
128	····socket_.close();	75	··········else
		76	··········{
		77	············socket_.close();
		78	··········}
		79	········});
		80	··}
		81
		82	··void·do_read_body()
		83	··{
		84	····asio::async_read(socket_,
		85	········asio::buffer(read_msg_.body(),·read_msg_.body_length()),
		86	········[this](std::error_code·ec,·std::size_t·/length/)
		87	········{
		88	··········if·(!ec)
		89	··········{
		90	············std::cout.write(read_msg_.body(),·read_msg_.body_length());
		91	············std::cout·<<·"\n";
		92	············do_read_header();
		93	··········}
		94	··········else
		95	··········{
		96	············socket_.close();
		97	··········}
		98	········});
		99	··}
		100
		101	··void·do_write()
		102	··{
		103	····asio::async_write(socket_,
		104	········asio::buffer(write_msgs_.front().data(),
		105	··········write_msgs_.front().length()),
		106	········[this](std::error_code·ec,·std::size_t·/length/)
		107	········{
		108	··········if·(!ec)
		109	··········{
		110	············write_msgs_.pop_front();
		111	············if·(!write_msgs_.empty())
		112	············{
		113	··············do_write();
		114	············}
		115	··········}
		116	··········else
		117	··········{
		118	············socket_.close();
		119	··········}
		120	········});
129	··}	121	··}
130		122
131	private:	123	private:
132	··asio::io_context&·io_context_;	124	··asio::io_context&·io_context_;
133	··tcp::socket·socket_;	125	··tcp::socket·socket_;
134	··chat_message·read_msg_;	126	··chat_message·read_msg_;
135	··chat_message_queue·write_msgs_;	127	··chat_message_queue·write_msgs_;
136	};	128	};
137		129
138	int·main(int·argc,·char*·argv[])	130	int·main(int·argc,·char*·argv[])
139	{	131	{
140	··try	132	··try
141	··{	133	··{
142	····if·(argc·!=·3)	134	····if·(argc·!=·3)
143	····{	135	····{
144	······std::cerr·<<·"Usage:·chat_client·<host>·<port>\n";	136	······std::cerr·<<·"Usage:·chat_client·<host>·<port>\n";
145	······return·1;	137	······return·1;
146	····}	138	····}
147		139
148	····asio::io_context·io_context;	140	····asio::io_context·io_context;
149		141
150	····tcp::resolver·resolver(io_context);	142	····tcp::resolver·resolver(io_context);
151	····tcp::resolver::results_type·endpoints·=·resolver.resolve(argv[1],·argv[2]);	143	····auto·endpoints·=·resolver.resolve(argv[1],·argv[2]);
152
153	····chat_client·c(io_context,·endpoints);	144	····chat_client·c(io_context,·endpoints);
154		145
155	····asio::thread·t(boost::bind(&asio::io_context::run,·&io_context));	146	····std::thread·t([&io_context](){·io_context.run();·});
156		147
157	····char·line[chat_message::max_body_length·+·1];	148	····char·line[chat_message::max_body_length·+·1];
158	····while·(std::cin.getline(line,·chat_message::max_body_length·+·1))	149	····while·(std::cin.getline(line,·chat_message::max_body_length·+·1))
159	····{	150	····{
160	······using·namespace·std;·//·For·strlen·and·memcpy.
161	······chat_message·msg;	151	······chat_message·msg;
162	······msg.body_length(strlen(line));	152	······msg.body_length(std::strlen(line));
163	······memcpy(msg.body(),·line,·msg.body_length());	153	······std::memcpy(msg.body(),·line,·msg.body_length());
164	······msg.encode_header();	154	······msg.encode_header();
165	······c.write(msg);	155	······c.write(msg);
166	····}	156	····}
167		157
168	····c.close();	158	····c.close();
169	····t.join();	159	····t.join();
170	··}	160	··}
171	··catch·(std::exception&·e)	161	··catch·(std::exception&·e)
172	··{	162	··{
173	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";	163	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";
174	··}	164	··}
175		165
176	··return·0;	166	··return·0;
177	}	167	}