HTML Diff nonblocking/third_party

src/examples/cpp03/nonblocking/third_party_lib.cpp		src/examples/cpp11/nonblocking/third_party_lib.cpp
⋮		⋮
1	//	1	//
2	//·third_party_lib.cpp	2	//·third_party_lib.cpp
3	//·~~~~~~~~~~~~~~~~~~~	3	//·~~~~~~~~~~~~~~~~~~~
4	//	4	//
5	//·Copyright·(c)·2003-2020·Christopher·M.·Kohlhoff·(chris·at·kohlhoff·dot·com)	5	//·Copyright·(c)·2003-2020·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·<asio.hpp>	11	#include·<asio.hpp>
12	#include·<boost/array.hpp>	12	#include·<array>
13	#include·<boost/bind/bind.hpp>
14	#include·<boost/shared_ptr.hpp>
15	#include·<boost/enable_shared_from_this.hpp>
16	#include·<iostream>	13	#include·<iostream>
		14	#include·<memory>
17		15
18	using·asio::ip::tcp;	16	using·asio::ip::tcp;
19		17
20	namespace·third_party_lib·{	18	namespace·third_party_lib·{
21		19
22	//·Simulation·of·a·third·party·library·that·wants·to·perform·read·and·write	20	//·Simulation·of·a·third·party·library·that·wants·to·perform·read·and·write
23	//·operations·directly·on·a·socket.·It·needs·to·be·polled·to·determine·whether	21	//·operations·directly·on·a·socket.·It·needs·to·be·polled·to·determine·whether
24	//·it·requires·a·read·or·write·operation,·and·notified·when·the·socket·is·ready	22	//·it·requires·a·read·or·write·operation,·and·notified·when·the·socket·is·ready
25	//·for·reading·or·writing.	23	//·for·reading·or·writing.
26	class·session	24	class·session
27	{	25	{
28	public:	26	public:
29	··session(tcp::socket&·socket)	27	··session(tcp::socket&·socket)
30	····:·socket_(socket),	28	····:·socket_(socket)
31	······state_(reading)
32	··{	29	··{
33	··}	30	··}
34		31
35	··//·Returns·true·if·the·third·party·library·wants·to·be·notified·when·the	32	··//·Returns·true·if·the·third·party·library·wants·to·be·notified·when·the
36	··//·socket·is·ready·for·reading.	33	··//·socket·is·ready·for·reading.
37	··bool·want_read()·const	34	··bool·want_read()·const
38	··{	35	··{
39	····return·state_·==·reading;	36	····return·state_·==·reading;
40	··}	37	··}
41		38
42	··//·Notify·that·third·party·library·that·it·should·perform·its·read·operation.	39	··//·Notify·that·third·party·library·that·it·should·perform·its·read·operation.
43	··void·do_read(asio::error_code&·ec)	40	··void·do_read(std::error_code&·ec)
44	··{	41	··{
45	····if·(std::size_t·len·=·socket_.read_some(asio::buffer(data_),·ec))	42	····if·(std::size_t·len·=·socket_.read_some(asio::buffer(data_),·ec))
46	····{	43	····{
47	······write_buffer_·=·asio::buffer(data_,·len);	44	······write_buffer_·=·asio::buffer(data_,·len);
48	······state_·=·writing;	45	······state_·=·writing;
49	····}	46	····}
50	··}	47	··}
51		48
52	··//·Returns·true·if·the·third·party·library·wants·to·be·notified·when·the	49	··//·Returns·true·if·the·third·party·library·wants·to·be·notified·when·the
53	··//·socket·is·ready·for·writing.	50	··//·socket·is·ready·for·writing.
54	··bool·want_write()·const	51	··bool·want_write()·const
55	··{	52	··{
56	····return·state_·==·writing;	53	····return·state_·==·writing;
57	··}	54	··}
58		55
59	··//·Notify·that·third·party·library·that·it·should·perform·its·write·operation.	56	··//·Notify·that·third·party·library·that·it·should·perform·its·write·operation.
60	··void·do_write(asio::error_code&·ec)	57	··void·do_write(std::error_code&·ec)
61	··{	58	··{
62	····if·(std::size_t·len·=·socket_.write_some(	59	····if·(std::size_t·len·=·socket_.write_some(
63	··········asio::buffer(write_buffer_),·ec))	60	··········asio::buffer(write_buffer_),·ec))
64	····{	61	····{
65	······write_buffer_·=·write_buffer_·+·len;	62	······write_buffer_·=·write_buffer_·+·len;
66	······state_·=·asio::buffer_size(write_buffer_)·>·0·?·writing·:·reading;	63	······state_·=·asio::buffer_size(write_buffer_)·>·0·?·writing·:·reading;
67	····}	64	····}
68	··}	65	··}
69		66
70	private:	67	private:
71	··tcp::socket&·socket_;	68	··tcp::socket&·socket_;
72	··enum·{·reading,·writing·}·state_;	69	··enum·{·reading,·writing·}·state_·=·reading;
73	··boost::array<char,·128>·data_;	70	··std::array<char,·128>·data_;
74	··asio::const_buffer·write_buffer_;	71	··asio::const_buffer·write_buffer_;
75	};	72	};
76		73
77	}·//·namespace·third_party_lib	74	}·//·namespace·third_party_lib
78		75
79	//·The·glue·between·asio's·sockets·and·the·third·party·library.	76	//·The·glue·between·asio's·sockets·and·the·third·party·library.
80	class·connection	77	class·connection
81	··:·public·boost::enable_shared_from_this<connection>	78	··:·public·std::enable_shared_from_this<connection>
82	{	79	{
83	public:	80	public:
84	··typedef·boost::shared_ptr<connection>·pointer;	81	··connection(tcp::socket·socket)
85		82	····:·socket_(std::move(socket))
86	··static·pointer·create(const·asio::executor&·ex)
87	··{
88	····return·pointer(new·connection(ex));
89	··}
90
91	··tcp::socket&·socket()
92	··{	83	··{
93	····return·socket_;
94	··}	84	··}
95		85
96	··void·start()	86	··void·start()
97	··{	87	··{
98	····//·Put·the·socket·into·non-blocking·mode.	88	····//·Put·the·socket·into·non-blocking·mode.
99	····socket_.non_blocking(true);	89	····socket_.non_blocking(true);
100		90
101	····start_operations();	91	····do_operations();
102	··}	92	··}
103		93
104	private:	94	private:
105	··connection(const·asio::executor&·ex)	95	··void·do_operations()
106	····:·socket_(ex),
107	······session_impl_(socket_),
108	······read_in_progress_(false),
109	······write_in_progress_(false)
110	··{	96	··{
111	··}	97	····auto·self(shared_from_this());
112		98
113	··void·start_operations()
114	··{
115	····//·Start·a·read·operation·if·the·third·party·library·wants·one.	99	····//·Start·a·read·operation·if·the·third·party·library·wants·one.
116	····if·(session_impl_.want_read()·&&·!read_in_progress_)	100	····if·(session_impl_.want_read()·&&·!read_in_progress_)
117	····{	101	····{
118	······read_in_progress_·=·true;	102	······read_in_progress_·=·true;
119	······socket_.async_wait(tcp::socket::wait_read,	103	······socket_.async_wait(tcp::socket::wait_read,
120	··········boost::bind(&connection::handle_read,	104	··········[this,·self](std::error_code·ec)
121	············shared_from_this(),	105	··········{
122	············asio::placeholders::error));	106	············read_in_progress_·=·false;
		107
		108	············//·Notify·third·party·library·that·it·can·perform·a·read.
		109	············if·(!ec)
		110	··············session_impl_.do_read(ec);
		111
		112	············//·The·third·party·library·successfully·performed·a·read·on·the
		113	············//·socket.·Start·new·read·or·write·operations·based·on·what·it·now
		114	············//·wants.
		115	············if·(!ec·\|\|·ec·==·asio::error::would_block)
		116	··············do_operations();
		117
		118	············//·Otherwise,·an·error·occurred.·Closing·the·socket·cancels·any
		119	············//·outstanding·asynchronous·read·or·write·operations.·The
		120	············//·connection·object·will·be·destroyed·automatically·once·those
		121	············//·outstanding·operations·complete.
		122	············else
		123	··············socket_.close();
		124	··········});
123	····}	125	····}
124		126
125	····//·Start·a·write·operation·if·the·third·party·library·wants·one.	127	····//·Start·a·write·operation·if·the·third·party·library·wants·one.
126	····if·(session_impl_.want_write()·&&·!write_in_progress_)	128	····if·(session_impl_.want_write()·&&·!write_in_progress_)
127	····{	129	····{
128	······write_in_progress_·=·true;	130	······write_in_progress_·=·true;
129	······socket_.async_wait(tcp::socket::wait_write,	131	······socket_.async_wait(tcp::socket::wait_write,
130	··········boost::bind(&connection::handle_write,	132	··········[this,·self](std::error_code·ec)
131	············shared_from_this(),	133	··········{
132	············asio::placeholders::error));	134	············write_in_progress_·=·false;
		135
		136	············//·Notify·third·party·library·that·it·can·perform·a·write.
		137	············if·(!ec)
		138	··············session_impl_.do_write(ec);
		139
		140	············//·The·third·party·library·successfully·performed·a·write·on·the
		141	············//·socket.·Start·new·read·or·write·operations·based·on·what·it·now
		142	············//·wants.
		143	············if·(!ec·\|\|·ec·==·asio::error::would_block)
		144	··············do_operations();
		145
		146	············//·Otherwise,·an·error·occurred.·Closing·the·socket·cancels·any
		147	············//·outstanding·asynchronous·read·or·write·operations.·The
		148	············//·connection·object·will·be·destroyed·automatically·once·those
		149	············//·outstanding·operations·complete.
		150	············else
		151	··············socket_.close();
		152	··········});
133	····}	153	····}
134	··}	154	··}
135		155
136	··void·handle_read(asio::error_code·ec)
137	··{
138	····read_in_progress_·=·false;
139
140	····//·Notify·third·party·library·that·it·can·perform·a·read.
141	····if·(!ec)
142	······session_impl_.do_read(ec);
143
144	····//·The·third·party·library·successfully·performed·a·read·on·the·socket.
145	····//·Start·new·read·or·write·operations·based·on·what·it·now·wants.
146	····if·(!ec·\|\|·ec·==·asio::error::would_block)
147	······start_operations();
148
149	····//·Otherwise,·an·error·occurred.·Closing·the·socket·cancels·any·outstanding
150	····//·asynchronous·read·or·write·operations.·The·connection·object·will·be
151	····//·destroyed·automatically·once·those·outstanding·operations·complete.
152	····else
153	······socket_.close();
154	··}
155
156	··void·handle_write(asio::error_code·ec)
157	··{
158	····write_in_progress_·=·false;
159
160	····//·Notify·third·party·library·that·it·can·perform·a·write.
161	····if·(!ec)
162	······session_impl_.do_write(ec);
163
164	····//·The·third·party·library·successfully·performed·a·write·on·the·socket.
165	····//·Start·new·read·or·write·operations·based·on·what·it·now·wants.
166	····if·(!ec·\|\|·ec·==·asio::error::would_block)
167	······start_operations();
168
169	····//·Otherwise,·an·error·occurred.·Closing·the·socket·cancels·any·outstanding
170	····//·asynchronous·read·or·write·operations.·The·connection·object·will·be
171	····//·destroyed·automatically·once·those·outstanding·operations·complete.
172	····else
173	······socket_.close();
174	··}
175
176	private:	156	private:
177	··tcp::socket·socket_;	157	··tcp::socket·socket_;
178	··third_party_lib::session·session_impl_;	158	··third_party_lib::session·session_impl_{socket_};
179	··bool·read_in_progress_;	159	··bool·read_in_progress_·=·false;
180	··bool·write_in_progress_;	160	··bool·write_in_progress_·=·false;
181	};	161	};
182		162
183	class·server	163	class·server
184	{	164	{
185	public:	165	public:
186	··server(asio::io_context&·io_context,·unsigned·short·port)	166	··server(asio::io_context&·io_context,·unsigned·short·port)
187	····:·acceptor_(io_context,·tcp::endpoint(tcp::v4(),·port))	167	····:·acceptor_(io_context,·{tcp::v4(),·port})
188	··{	168	··{
189	····start_accept();	169	····do_accept();
190	··}	170	··}
191		171
192	private:	172	private:
193	··void·start_accept()	173	··void·do_accept()
194	··{	174	··{
195	····connection::pointer·new_connection·=	175	····acceptor_.async_accept(
196	······connection::create(acceptor_.get_executor());	176	········[this](std::error_code·ec,·tcp::socket·socket)
197		177	········{
198	····acceptor_.async_accept(new_connection->socket(),	178	··········if·(!ec)
199	········boost::bind(&server::handle_accept,·this,·new_connection,	179	··········{
200	··········asio::placeholders::error));	180	············std::make_shared<connection>(std::move(socket))->start();
201	··}	181	··········}
202
203	··void·handle_accept(connection::pointer·new_connection,
204	······const·asio::error_code&·error)
205	··{
206	····if·(!error)
207	····{
208	······new_connection->start();
209	····}
210		182
211	····start_accept();	183	··········do_accept();
		184	········});
212	··}	185	··}
213		186
214	··tcp::acceptor·acceptor_;	187	··tcp::acceptor·acceptor_;
215	};	188	};
216		189
217	int·main(int·argc,·char*·argv[])	190	int·main(int·argc,·char*·argv[])
218	{	191	{
219	··try	192	··try
220	··{	193	··{
221	····if·(argc·!=·2)	194	····if·(argc·!=·2)
222	····{	195	····{
223	······std::cerr·<<·"Usage:·third_party_lib·<port>\n";	196	······std::cerr·<<·"Usage:·third_party_lib·<port>\n";
224	······return·1;	197	······return·1;
225	····}	198	····}
226		199
227	····asio::io_context·io_context;	200	····asio::io_context·io_context;
228		201
229	····using·namespace·std;·//·For·atoi.	202	····server·s(io_context,·std::atoi(argv[1]));
230	····server·s(io_context,·atoi(argv[1]));
231		203
232	····io_context.run();	204	····io_context.run();
233	··}	205	··}
234	··catch·(std::exception&·e)	206	··catch·(std::exception&·e)
235	··{	207	··{
236	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";	208	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";
237	··}	209	··}
238		210
239	··return·0;	211	··return·0;
240	}	212	}