|
| 1 | +// |
| 2 | +// Copyright (c) 2017 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| 3 | +// |
| 4 | +// Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 5 | +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 6 | +// |
| 7 | +// Official repository: https://github.com/boostorg/beast |
| 8 | +// |
| 9 | + |
| 10 | +//------------------------------------------------------------------------------ |
| 11 | +// |
| 12 | +// Example: HTTP server, small |
| 13 | +// |
| 14 | +//------------------------------------------------------------------------------ |
| 15 | + |
| 16 | +#include <boost/beast/core.hpp> |
| 17 | +#include <boost/beast/http.hpp> |
| 18 | +#include <boost/beast/version.hpp> |
| 19 | +#include <boost/optional/optional_io.hpp>> |
| 20 | +#include <boost/asio.hpp> |
| 21 | +#include <boost/algorithm/string.hpp> |
| 22 | +#include <chrono> |
| 23 | +#include <cstdlib> |
| 24 | +#include <ctime> |
| 25 | +#include <iostream> |
| 26 | +#include <memory> |
| 27 | +#include <string> |
| 28 | +#include "Searcher.h"" |
| 29 | +
|
| 30 | +namespace beast = boost::beast; // from <boost/beast.hpp> |
| 31 | +namespace http = beast::http; // from <boost/beast/http.hpp> |
| 32 | +namespace net = boost::asio; // from <boost/asio.hpp> |
| 33 | +using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp> |
| 34 | +
|
| 35 | +namespace my_program_state |
| 36 | +{ |
| 37 | +std::size_t |
| 38 | +request_count() |
| 39 | +{ |
| 40 | + static std::size_t count = 0; |
| 41 | + return ++count; |
| 42 | +} |
| 43 | +
|
| 44 | +std::time_t |
| 45 | +now() |
| 46 | +{ |
| 47 | + return std::time(0); |
| 48 | +} |
| 49 | +} |
| 50 | +
|
| 51 | +class http_connection : public std::enable_shared_from_this<http_connection> |
| 52 | +{ |
| 53 | +public: |
| 54 | + http_connection(tcp::socket socket) |
| 55 | + : socket_(std::move(socket)) |
| 56 | + { |
| 57 | + } |
| 58 | +
|
| 59 | + // Initiate the asynchronous operations associated with the connection. |
| 60 | + void |
| 61 | + start() |
| 62 | + { |
| 63 | + read_request(); |
| 64 | + check_deadline(); |
| 65 | + } |
| 66 | +
|
| 67 | +private: |
| 68 | + // The socket for the currently connected client. |
| 69 | + tcp::socket socket_; |
| 70 | +
|
| 71 | + // The buffer for performing reads. |
| 72 | + beast::flat_buffer buffer_{8192}; |
| 73 | +
|
| 74 | + // The request message. |
| 75 | + http::request<http::string_body> request_; |
| 76 | +
|
| 77 | + // The response message. |
| 78 | + http::response<http::dynamic_body> response_; |
| 79 | +
|
| 80 | + // The timer for putting a deadline on connection processing. |
| 81 | + net::steady_timer deadline_{ |
| 82 | + socket_.get_executor(), std::chrono::seconds(60)}; |
| 83 | +
|
| 84 | + // Asynchronously receive a complete request message. |
| 85 | + void |
| 86 | + read_request() |
| 87 | + { |
| 88 | + auto self = shared_from_this(); |
| 89 | +
|
| 90 | + http::async_read( |
| 91 | + socket_, |
| 92 | + buffer_, |
| 93 | + request_, |
| 94 | + [self](beast::error_code ec, |
| 95 | + std::size_t bytes_transferred) |
| 96 | + { |
| 97 | + boost::ignore_unused(bytes_transferred); |
| 98 | + if(!ec) |
| 99 | + self->process_request(); |
| 100 | + }); |
| 101 | + } |
| 102 | +
|
| 103 | + // Determine what needs to be done with the request message. |
| 104 | + void |
| 105 | + process_request() |
| 106 | + { |
| 107 | + response_.version(request_.version()); |
| 108 | + response_.keep_alive(false); |
| 109 | +
|
| 110 | + switch(request_.method()) |
| 111 | + { |
| 112 | + case http::verb::get: |
| 113 | + response_.result(http::status::ok); |
| 114 | + response_.set(http::field::server, "Beast"); |
| 115 | + create_response(); |
| 116 | + break; |
| 117 | +
|
| 118 | + case http::verb::post: |
| 119 | + response_.result(http::status::ok); |
| 120 | + response_.set(http::field::server, "Beast"); |
| 121 | + create_response_on_post(); |
| 122 | + break; |
| 123 | +
|
| 124 | + default: |
| 125 | + // We return responses indicating an error if |
| 126 | + // we do not recognize the request method. |
| 127 | + response_.result(http::status::bad_request); |
| 128 | + response_.set(http::field::content_type, "text/plain"); |
| 129 | + beast::ostream(response_.body()) |
| 130 | + << "Invalid request-method '" |
| 131 | + << std::string(request_.method_string()) |
| 132 | + << "'"; |
| 133 | + break; |
| 134 | + } |
| 135 | +
|
| 136 | + write_response(); |
| 137 | + } |
| 138 | +
|
| 139 | + // Construct a response message based on the program state. |
| 140 | + void |
| 141 | + create_response() |
| 142 | + { |
| 143 | + if(request_.target() == "/count") |
| 144 | + { |
| 145 | + response_.set(http::field::content_type, "text/html"); |
| 146 | + beast::ostream(response_.body()) |
| 147 | + << "<html>\n" |
| 148 | + << "<head><title>Request count</title></head>\n" |
| 149 | + << "<body>\n" |
| 150 | + << "<h1>Request count</h1>\n" |
| 151 | + << "<p>There have been " |
| 152 | + << my_program_state::request_count() |
| 153 | + << " requests so far.</p>\n" |
| 154 | + << "</body>\n" |
| 155 | + << "</html>\n"; |
| 156 | + } |
| 157 | + else if(request_.target() == "/time") |
| 158 | + { |
| 159 | + response_.set(http::field::content_type, "text/html"); |
| 160 | + beast::ostream(response_.body()) |
| 161 | + << "<html>\n" |
| 162 | + << "<head><title>Current time</title></head>\n" |
| 163 | + << "<body>\n" |
| 164 | + << "<h1>Current time</h1>\n" |
| 165 | + << "<p>The current time is " |
| 166 | + << my_program_state::now() |
| 167 | + << " seconds since the epoch.</p>\n" |
| 168 | + << "</body>\n" |
| 169 | + << "</html>\n"; |
| 170 | + } |
| 171 | + else if(request_.target() == "/search") |
| 172 | + { |
| 173 | + response_.set(http::field::content_type, "text/html"); |
| 174 | + beast::ostream(response_.body()) |
| 175 | + << "<!DOCTYPE html>\n" |
| 176 | + << "<html>\n" |
| 177 | + << "<body>\n" |
| 178 | + << "<form action=\"/search\" method=\"post\">\n" |
| 179 | + << "<label for=\"fname\">Search request:</label><br>\n" |
| 180 | + << "<input type=\"text\" id=\"request\" name=\"request\" value=\"what?\"><br><br>\n" |
| 181 | + << "<input type=\"submit\" value=\"Submit\">\n" |
| 182 | + << "</form>\n" |
| 183 | + << "</body>\n" |
| 184 | + << "</html>\n"; |
| 185 | + } |
| 186 | + else |
| 187 | + { |
| 188 | + response_.result(http::status::not_found); |
| 189 | + response_.set(http::field::content_type, "text/plain"); |
| 190 | + beast::ostream(response_.body()) << "File not found\r\n"; |
| 191 | + } |
| 192 | + } |
| 193 | +
|
| 194 | + // Construct a response message based on the program state. |
| 195 | + void |
| 196 | + create_response_on_post() |
| 197 | + { |
| 198 | + // функция формирования ответа со списком ресурсов |
| 199 | +
|
| 200 | + // получение payload запроса вида request=word1+word2+... |
| 201 | + std::string body = request_.body(); |
| 202 | + std::cout << body << std::endl; |
| 203 | +
|
| 204 | + // удаление из строки приставки request= |
| 205 | + std::vector<std::string> wordsStr; |
| 206 | + boost::split(wordsStr, body, boost::is_any_of("=")); |
| 207 | + wordsStr.erase(wordsStr.begin()); |
| 208 | + for (auto& i : wordsStr) { |
| 209 | + std::cout << i << std::endl; |
| 210 | + } |
| 211 | +
|
| 212 | + // составление вектора слов |
| 213 | + std::vector<std::string> words; |
| 214 | + boost::split(words, wordsStr[0], boost::is_any_of("+")); |
| 215 | + for (auto& i : words) { |
| 216 | + std::cout << i << std::endl; |
| 217 | + } |
| 218 | +
|
| 219 | + // поиск ресурсов по словам |
| 220 | + Searcher searcher = Searcher(); |
| 221 | + std::vector<std::string> urls; |
| 222 | + try { |
| 223 | + urls = searcher.processSearchRequest(words); |
| 224 | + } catch (std::exception const& e) { |
| 225 | + std::cout << e.what() << std::endl; |
| 226 | + } |
| 227 | +
|
| 228 | + // преобразование списка ресурсов к HTML-формату |
| 229 | + std::string hrefsStr = getHrefListStringFromVector(urls); |
| 230 | +
|
| 231 | + // формирование ответа |
| 232 | + response_.set(http::field::content_type, "text/html"); |
| 233 | + beast::ostream(response_.body()) |
| 234 | + << "<!DOCTYPE html>\n" |
| 235 | + << "<html>\n" |
| 236 | + << "<body>\n" |
| 237 | + << "<form action=\"/search\" method=\"post\">\n" |
| 238 | + << "<label for=\"fname\">Search request:</label><br>\n" |
| 239 | + << "<input type=\"text\" id=\"request\" name=\"request\" value=\"what?\"><br><br>\n" |
| 240 | + << "<input type=\"submit\" value=\"Submit\">\n" |
| 241 | + << "</form>\n" |
| 242 | + << "<p>\n" |
| 243 | + << hrefsStr |
| 244 | + << "</p>\n" |
| 245 | + << "</body>\n" |
| 246 | + << "</html>\n"; |
| 247 | + } |
| 248 | +
|
| 249 | + // Asynchronously transmit the response message. |
| 250 | + void |
| 251 | + write_response() |
| 252 | + { |
| 253 | + auto self = shared_from_this(); |
| 254 | +
|
| 255 | + response_.content_length(response_.body().size()); |
| 256 | +
|
| 257 | + http::async_write( |
| 258 | + socket_, |
| 259 | + response_, |
| 260 | + [self](beast::error_code ec, std::size_t) |
| 261 | + { |
| 262 | + self->socket_.shutdown(tcp::socket::shutdown_send, ec); |
| 263 | + self->deadline_.cancel(); |
| 264 | + }); |
| 265 | + } |
| 266 | +
|
| 267 | + // Check whether we have spent enough time on this connection. |
| 268 | + void |
| 269 | + check_deadline() |
| 270 | + { |
| 271 | + auto self = shared_from_this(); |
| 272 | +
|
| 273 | + deadline_.async_wait( |
| 274 | + [self](beast::error_code ec) |
| 275 | + { |
| 276 | + if(!ec) |
| 277 | + { |
| 278 | + // Close socket to cancel any outstanding operation. |
| 279 | + self->socket_.close(ec); |
| 280 | + } |
| 281 | + }); |
| 282 | + } |
| 283 | +
|
| 284 | + std::string getHrefListStringFromVector(std::vector<std::string> urlsVector) |
| 285 | + { |
| 286 | + // преобразование вектора ресурсов к их перечислению в формате HTML |
| 287 | +
|
| 288 | + std::string line = ""; |
| 289 | + auto it = urlsVector.begin(); |
| 290 | + std::string val = *it; |
| 291 | + line += "<a href=\">"; |
| 292 | + line += (val); |
| 293 | + line += "\">"; |
| 294 | + line += (val); |
| 295 | + line += "</a>"; |
| 296 | + |
| 297 | + while(it != urlsVector.end() - 1) |
| 298 | + { |
| 299 | + ++it; |
| 300 | + line += "<br>"; |
| 301 | + std::string val = *it; |
| 302 | + line += "<a href=\">"; |
| 303 | + line += (val); |
| 304 | + line += "\">"; |
| 305 | + line += (val); |
| 306 | + line += "</a>"; |
| 307 | + } |
| 308 | + return line; |
| 309 | + } |
| 310 | +}; |
| 311 | + |
| 312 | +// "Loop" forever accepting new connections. |
| 313 | +void |
| 314 | +http_server(tcp::acceptor& acceptor, tcp::socket& socket) |
| 315 | +{ |
| 316 | + acceptor.async_accept(socket, |
| 317 | + [&](beast::error_code ec) |
| 318 | + { |
| 319 | + if(!ec) |
| 320 | + std::make_shared<http_connection>(std::move(socket))->start(); |
| 321 | + http_server(acceptor, socket); |
| 322 | + }); |
| 323 | +} |
| 324 | + |
| 325 | +int |
| 326 | +main(int argc, char* argv[]) |
| 327 | +{ |
| 328 | + try |
| 329 | + { |
| 330 | + // Check command line arguments. |
| 331 | + if(argc != 3) |
| 332 | + { |
| 333 | + std::cerr << "Usage: " << argv[0] << " <address> <port>\n"; |
| 334 | + std::cerr << " For IPv4, try:\n"; |
| 335 | + std::cerr << " receiver 0.0.0.0 80\n"; |
| 336 | + std::cerr << " For IPv6, try:\n"; |
| 337 | + std::cerr << " receiver 0::0 80\n"; |
| 338 | + return EXIT_FAILURE; |
| 339 | + } |
| 340 | + |
| 341 | + auto const address = net::ip::make_address(argv[1]); |
| 342 | + unsigned short port = static_cast<unsigned short>(std::atoi(argv[2])); |
| 343 | + |
| 344 | + net::io_context ioc{1}; |
| 345 | + |
| 346 | + tcp::acceptor acceptor{ioc, {address, port}}; |
| 347 | + tcp::socket socket{ioc}; |
| 348 | + http_server(acceptor, socket); |
| 349 | + |
| 350 | + ioc.run(); |
| 351 | + } |
| 352 | + catch(std::exception const& e) |
| 353 | + { |
| 354 | + std::cerr << "Error: " << e.what() << std::endl; |
| 355 | + return EXIT_FAILURE; |
| 356 | + } |
| 357 | +} |
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