HTML Diff local/connect

src/examples/cpp03/local/connect_pair.cpp		src/examples/cpp11/local/connect_pair.cpp
⋮		⋮
1	//	1	//
2	//·connect_pair.cpp	2	//·connect_pair.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·<array>
11	#include·<iostream>	12	#include·<iostream>
12	#include·<string>	13	#include·<string>
13	#include·<cctype>	14	#include·<cctype>
14	#include·<asio.hpp>	15	#include·<asio.hpp>
15	#include·<boost/array.hpp>
16	#include·<boost/bind/bind.hpp>
17		16
18	#if·defined(ASIO_HAS_LOCAL_SOCKETS)	17	#if·defined(ASIO_HAS_LOCAL_SOCKETS)
19		18
20	using·asio::local::stream_protocol;	19	using·asio::local::stream_protocol;
21		20
22	class·uppercase_filter	21	class·uppercase_filter
23	{	22	{
24	public:	23	public:
25	··uppercase_filter(asio::io_context&·io_context)	24	··uppercase_filter(stream_protocol::socket·sock)
26	····:·socket_(io_context)	25	····:·socket_(std::move(sock))
27	··{	26	··{
28	··}	27	····read();
29
30	··stream_protocol::socket&·socket()
31	··{
32	····return·socket_;
33	··}
34
35	··void·start()
36	··{
37	····//·Wait·for·request.
38	····socket_.async_read_some(asio::buffer(data_),
39	········boost::bind(&uppercase_filter::handle_read,
40	··········this,·asio::placeholders::error,
41	··········asio::placeholders::bytes_transferred));
42	··}	28	··}
43		29
44	private:	30	private:
45	··void·handle_read(const·asio::error_code&·ec,·std::size_t·size)	31	··void·read()
46	··{	32	··{
47	····if·(!ec)	33	····socket_.async_read_some(asio::buffer(data_),
48	····{	34	········[this](std::error_code·ec,·std::size_t·size)
49	······//·Compute·result.	35	········{
50	······for·(std::size_t·i·=·0;·i·<·size;·++i)	36	··········if·(!ec)
51	········data_[i]·=·std::toupper(data_[i]);	37	··········{
52		38	············//·Compute·result.
53	······//·Send·result.	39	············for·(std::size_t·i·=·0;·i·<·size;·++i)
54	······asio::async_write(socket_,·asio::buffer(data_,·size),	40	··············data_[i]·=·std::toupper(data_[i]);
55	··········boost::bind(&uppercase_filter::handle_write,	41
56	············this,·asio::placeholders::error));	42	············//·Send·result.
57	····}	43	············write(size);
58	····else	44	··········}
59	····{	45	··········else
60	······throw·asio::system_error(ec);	46	··········{
61	····}	47	············throw·asio::system_error(ec);
62	··}	48	··········}
63		49	········});
64	··void·handle_write(const·asio::error_code&·ec)	50	··}
65	··{	51
66	····if·(!ec)	52	··void·write(std::size_t·size)
67	····{	53	··{
68	······//·Wait·for·request.	54	····asio::async_write(socket_,·asio::buffer(data_,·size),
69	······socket_.async_read_some(asio::buffer(data_),	55	········[this](std::error_code·ec,·std::size_t·/size/)
70	··········boost::bind(&uppercase_filter::handle_read,	56	········{
71	············this,·asio::placeholders::error,	57	··········if·(!ec)
72	············asio::placeholders::bytes_transferred));	58	··········{
73	····}	59	············//·Wait·for·request.
74	····else	60	············read();
75	····{	61	··········}
76	······throw·asio::system_error(ec);	62	··········else
77	····}	63	··········{
		64	············throw·asio::system_error(ec);
		65	··········}
		66	········});
78	··}	67	··}
79		68
80	··stream_protocol::socket·socket_;	69	··stream_protocol::socket·socket_;
81	··boost::array<char,·512>·data_;	70	··std::array<char,·512>·data_;
82	};	71	};
83		72
84	void·run(asio::io_context*·io_context)
85	{
86	··try
87	··{
88	····io_context->run();
89	··}
90	··catch·(std::exception&·e)
91	··{
92	····std::cerr·<<·"Exception·in·thread:·"·<<·e.what()·<<·"\n";
93	····std::exit(1);
94	··}
95	}
96
97	int·main()	73	int·main()
98	{	74	{
99	··try	75	··try
100	··{	76	··{
101	····asio::io_context·io_context;	77	····asio::io_context·io_context;
102		78
103	····//·Create·filter·and·establish·a·connection·to·it.	79	····//·Create·a·connected·pair·and·pass·one·end·to·a·filter.
104	····uppercase_filter·filter(io_context);
105	····stream_protocol::socket·socket(io_context);	80	····stream_protocol::socket·socket(io_context);
106	····asio::local::connect_pair(socket,·filter.socket());	81	····stream_protocol::socket·filter_socket(io_context);
107	····filter.start();	82	····asio::local::connect_pair(socket,·filter_socket);
		83	····uppercase_filter·filter(std::move(filter_socket));
108		84
109	····//·The·io_context·runs·in·a·background·thread·to·perform·filtering.	85	····//·The·io_context·runs·in·a·background·thread·to·perform·filtering.
110	····asio::thread·thread(boost::bind(run,·&io_context));	86	····asio::thread·thread(
		87	········[&io_context]()
		88	········{
		89	··········try
		90	··········{
		91	············io_context.run();
		92	··········}
		93	··········catch·(std::exception&·e)
		94	··········{
		95	············std::cerr·<<·"Exception·in·thread:·"·<<·e.what()·<<·"\n";
		96	············std::exit(1);
		97	··········}
		98	········});
111		99
112	····for·(;;)	100	····for·(;;)
113	····{	101	····{
114	······//·Collect·request·from·user.	102	······//·Collect·request·from·user.
115	······std::cout·<<·"Enter·a·string:·";	103	······std::cout·<<·"Enter·a·string:·";
116	······std::string·request;	104	······std::string·request;
117	······std::getline(std::cin,·request);	105	······std::getline(std::cin,·request);
118		106
119	······//·Send·request·to·filter.	107	······//·Send·request·to·filter.
120	······asio::write(socket,·asio::buffer(request));	108	······asio::write(socket,·asio::buffer(request));
121		109
122	······//·Wait·for·reply·from·filter.	110	······//·Wait·for·reply·from·filter.
123	······std::vector<char>·reply(request.size());	111	······std::vector<char>·reply(request.size());
124	······asio::read(socket,·asio::buffer(reply));	112	······asio::read(socket,·asio::buffer(reply));
125		113
126	······//·Show·reply·to·user.	114	······//·Show·reply·to·user.
127	······std::cout·<<·"Result:·";	115	······std::cout·<<·"Result:·";
128	······std::cout.write(&reply[0],·request.size());	116	······std::cout.write(&reply[0],·request.size());
129	······std::cout·<<·std::endl;	117	······std::cout·<<·std::endl;
130	····}	118	····}
131	··}	119	··}
132	··catch·(std::exception&·e)	120	··catch·(std::exception&·e)
133	··{	121	··{
134	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";	122	····std::cerr·<<·"Exception:·"·<<·e.what()·<<·"\n";
135	····std::exit(1);	123	····std::exit(1);
136	··}	124	··}
137	}	125	}
138		126
139	#else·//·defined(ASIO_HAS_LOCAL_SOCKETS)	127	#else·//·defined(ASIO_HAS_LOCAL_SOCKETS)
140	#·error·Local·sockets·not·available·on·this·platform.	128	#·error·Local·sockets·not·available·on·this·platform.
141	#endif·//·defined(ASIO_HAS_LOCAL_SOCKETS)	129	#endif·//·defined(ASIO_HAS_LOCAL_SOCKETS)