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-rw-r--r--3rdparty/asio/src/examples/cpp03/http/client/async_client.cpp204
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..210715bbd98
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp03/http/client/async_client.cpp
@@ -0,0 +1,204 @@
+//
+// async_client.cpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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/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;
+}