add very simple Webclient class. needed for LAS-22, LAS-23, JSON-54 etc.

roker 2 years ago
parent 68f849d814
commit 9c66bb57d7

@ -0,0 +1,73 @@
#include "webclient.hh"
#include <string>
#include <stdexcept>
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
namespace pEp
namespace beast = boost::beast; // from <boost/beast.hpp>
namespace http = beast::http; // from <boost/beast/http.hpp>
namespace net = boost::asio; // from <boost/asio.hpp>
using tcp = net::ip::tcp; // from <boost/asio/ip/tcp.hpp>
HttpError::HttpError(unsigned error_code, const std::string& error_message)
: runtime_error("HTTP Error: " + std::to_string(error_code) + " " + error_message)
// based on
std::string Webclient::get(const std::string& url)
// The io_context is required for all I/O
net::io_context ioc;
// These objects perform our I/O
tcp::resolver resolver(ioc);
beast::tcp_stream stream(ioc);
// Look up the domain name
auto const results = resolver.resolve(m_server_name, std::to_string(m_port));
// Make the connection on the IP address we get from a lookup
// Set up an HTTP GET request message
http::request<http::string_body> req{http::verb::get, url, 11};
req.set(http::field::host, m_server_name);
req.set(http::field::user_agent, "pEp::Webclient 0.1");
// Send the HTTP request to the remote host
http::write(stream, req);
// This buffer is used for reading and must be persisted
beast::flat_buffer buffer;
// Declare a container to hold the response
http::response<http::dynamic_body> res;
// Receive the HTTP response
http::read(stream, buffer, res);
// Gracefully close the socket
beast::error_code ec;
stream.socket().shutdown(tcp::socket::shutdown_both, ec);
// not_connected happens sometimes
// so don't bother reporting it.
if(ec && ec != beast::errc::not_connected)
throw beast::system_error{ec};
// If we get here then the connection is closed gracefully
return boost::beast::buffers_to_string(res.body().data());
} // end of namespace pEp

@ -0,0 +1,30 @@
#pragma once
#include <string>
#include <stdexcept>
namespace pEp
class HttpError : public std::runtime_error
HttpError(unsigned error_code, const std::string& error_message);
class Webclient
Webclient(const std::string& server_name, unsigned port=80)
: m_server_name{server_name}
, m_port{port}
std::string get(const std::string& url);
const std::string& m_server_name;
const unsigned m_port;
} // end of namespace pEp