diff options
Diffstat (limited to '3rdparty/asio/src/examples/cpp03/http/client/async_client.cpp')
-rw-r--r-- | 3rdparty/asio/src/examples/cpp03/http/client/async_client.cpp | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/http/client/async_client.cpp b/3rdparty/asio/src/examples/cpp03/http/client/async_client.cpp new file mode 100644 index 00000000000..83dcc36d53a --- /dev/null +++ b/3rdparty/asio/src/examples/cpp03/http/client/async_client.cpp @@ -0,0 +1,204 @@ +// +// async_client.cpp +// ~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2016 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 <iostream> +#include <istream> +#include <ostream> +#include <string> +#include <asio.hpp> +#include <boost/bind.hpp> + +using asio::ip::tcp; + +class client +{ +public: + client(asio::io_context& io_context, + const std::string& server, const std::string& path) + : resolver_(io_context), + socket_(io_context) + { + // Form the request. We specify the "Connection: close" header so that the + // server will close the socket after transmitting the response. This will + // allow us to treat all data up until the EOF as the content. + std::ostream request_stream(&request_); + request_stream << "GET " << path << " HTTP/1.0\r\n"; + request_stream << "Host: " << server << "\r\n"; + request_stream << "Accept: */*\r\n"; + request_stream << "Connection: close\r\n\r\n"; + + // Start an asynchronous resolve to translate the server and service names + // into a list of endpoints. + resolver_.async_resolve(server, "http", + boost::bind(&client::handle_resolve, this, + asio::placeholders::error, + asio::placeholders::results)); + } + +private: + void handle_resolve(const asio::error_code& err, + const tcp::resolver::results_type& endpoints) + { + if (!err) + { + // Attempt a connection to each endpoint in the list until we + // successfully establish a connection. + asio::async_connect(socket_, endpoints, + boost::bind(&client::handle_connect, this, + asio::placeholders::error)); + } + else + { + std::cout << "Error: " << err.message() << "\n"; + } + } + + void handle_connect(const asio::error_code& err) + { + if (!err) + { + // The connection was successful. Send the request. + asio::async_write(socket_, request_, + boost::bind(&client::handle_write_request, this, + asio::placeholders::error)); + } + else + { + std::cout << "Error: " << err.message() << "\n"; + } + } + + void handle_write_request(const asio::error_code& err) + { + if (!err) + { + // Read the response status line. The response_ streambuf will + // automatically grow to accommodate the entire line. The growth may be + // limited by passing a maximum size to the streambuf constructor. + asio::async_read_until(socket_, response_, "\r\n", + boost::bind(&client::handle_read_status_line, this, + asio::placeholders::error)); + } + else + { + std::cout << "Error: " << err.message() << "\n"; + } + } + + void handle_read_status_line(const asio::error_code& err) + { + if (!err) + { + // Check that response is OK. + std::istream response_stream(&response_); + std::string http_version; + response_stream >> http_version; + unsigned int status_code; + response_stream >> status_code; + std::string status_message; + std::getline(response_stream, status_message); + if (!response_stream || http_version.substr(0, 5) != "HTTP/") + { + std::cout << "Invalid response\n"; + return; + } + if (status_code != 200) + { + std::cout << "Response returned with status code "; + std::cout << status_code << "\n"; + return; + } + + // Read the response headers, which are terminated by a blank line. + asio::async_read_until(socket_, response_, "\r\n\r\n", + boost::bind(&client::handle_read_headers, this, + asio::placeholders::error)); + } + else + { + std::cout << "Error: " << err << "\n"; + } + } + + void handle_read_headers(const asio::error_code& err) + { + if (!err) + { + // Process the response headers. + std::istream response_stream(&response_); + std::string header; + while (std::getline(response_stream, header) && header != "\r") + std::cout << header << "\n"; + std::cout << "\n"; + + // Write whatever content we already have to output. + if (response_.size() > 0) + std::cout << &response_; + + // Start reading remaining data until EOF. + asio::async_read(socket_, response_, + asio::transfer_at_least(1), + boost::bind(&client::handle_read_content, this, + asio::placeholders::error)); + } + else + { + std::cout << "Error: " << err << "\n"; + } + } + + void handle_read_content(const asio::error_code& err) + { + if (!err) + { + // Write all of the data that has been read so far. + std::cout << &response_; + + // Continue reading remaining data until EOF. + asio::async_read(socket_, response_, + asio::transfer_at_least(1), + boost::bind(&client::handle_read_content, this, + asio::placeholders::error)); + } + else if (err != asio::error::eof) + { + std::cout << "Error: " << err << "\n"; + } + } + + tcp::resolver resolver_; + tcp::socket socket_; + asio::streambuf request_; + asio::streambuf response_; +}; + +int main(int argc, char* argv[]) +{ + try + { + if (argc != 3) + { + std::cout << "Usage: async_client <server> <path>\n"; + std::cout << "Example:\n"; + std::cout << " async_client www.boost.org /LICENSE_1_0.txt\n"; + return 1; + } + + asio::io_context io_context; + client c(io_context, argv[1], argv[2]); + io_context.run(); + } + catch (std::exception& e) + { + std::cout << "Exception: " << e.what() << "\n"; + } + + return 0; +} |