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#ifndef TGBOT_HTTPSERVER_H
#define TGBOT_HTTPSERVER_H
#include "tgbot/net/HttpParser.h"
#include <boost/asio.hpp>
#include <cstddef>
#include <exception>
#include <functional>
#include <iostream>
#include <memory>
#include <string>
#include <unordered_map>
#include <utility>
namespace TgBot {
/**
* @brief This class handles HTTP requests from the Internet.
*
* @ingroup net
*/
template<typename Protocol>
class HttpServer {
protected:
class Connection;
public:
typedef std::function<std::string (const std::string&, const std::unordered_map<std::string, std::string>&)> ServerHandler;
HttpServer(const typename boost::asio::basic_socket_acceptor<Protocol>::endpoint_type& endpoint, ServerHandler handler)
: _ioService(), _acceptor(_ioService, endpoint), _socket(_ioService), _handler(std::move(handler)), _httpParser()
{
}
/**
* @brief Starts receiving new connections.
*/
void start() {
_startAccept();
_ioService.run();
}
/**
* @brief Stops receiving new connections.
*/
void stop() {
_ioService.stop();
}
protected:
class Connection : public std::enable_shared_from_this<Connection> {
public:
Connection(boost::asio::basic_stream_socket<Protocol> socket, ServerHandler handler, const HttpParser& httpParser)
: _socket(std::move(socket)), _handler(std::move(handler)), _httpParser(httpParser)
{
}
void start() {
_readHeader();
}
protected:
boost::asio::basic_stream_socket<Protocol> _socket;
const ServerHandler _handler;
const HttpParser& _httpParser;
void _readHeader() {
auto self(this->shared_from_this());
auto data(std::make_shared<boost::asio::streambuf>());
data->prepare(1024);
boost::asio::async_read_until(
_socket,
*data,
"\r\n\r\n",
[self, data](const boost::system::error_code& e, std::size_t n) {
if (e) {
std::cout << "error in HttpServer::Connection#_readHeader: " << e << std::endl;
return;
}
boost::asio::streambuf::const_buffers_type bufs = data->data();
std::string dataAsString(boost::asio::buffers_begin(bufs), boost::asio::buffers_begin(bufs) + n);
auto headers(std::make_shared<std::unordered_map<std::string, std::string>>(self->_httpParser.parseHeader(dataAsString, true)));
unsigned long long size;
auto contentLengthIter = headers->find("Content-Length");
if (contentLengthIter != headers->end()) {
size = std::stoull(contentLengthIter->second);
} else {
size = 0;
}
if (size == 0) {
std::string answer = self->_httpParser.generateResponse("Bad request", "text/plain", 400, "Bad request", false);
boost::asio::async_write(
self->_socket,
boost::asio::buffer(answer),
[](const boost::system::error_code&, std::size_t) { });
return;
}
data->consume(n);
self->_readBody(data, size, headers);
});
}
void _readBody(std::shared_ptr<boost::asio::streambuf> data, unsigned long long size, std::shared_ptr<std::unordered_map<std::string, std::string>> headers) {
auto self(this->shared_from_this());
data->prepare(size);
boost::asio::async_read(_socket,
*data,
boost::asio::transfer_exactly(size - data->size()),
[self, data, size, headers](const boost::system::error_code& e, std::size_t) {
if (e) {
std::cout << "error in HttpServer::Connection#_readBody: " << e << std::endl;
return;
}
boost::asio::streambuf::const_buffers_type bufs = data->data();
std::string dataAsString(boost::asio::buffers_begin(bufs), boost::asio::buffers_begin(bufs) + size);
std::string answer;
try {
answer = self->_handler(dataAsString, *headers);
} catch (std::exception& e) {
std::cout << "error in HttpServer::Connection#_readBody answer: " << e.what() << std::endl;
answer = self->_httpParser.generateResponse("Internal server error", "text/plain", 500, "Internal server error", false);
}
boost::asio::async_write(
self->_socket,
boost::asio::buffer(answer),
[](const boost::system::error_code&, std::size_t) { });
self->_socket.close();
});
}
};
void _startAccept() {
_acceptor.async_accept(_socket, [this](const boost::system::error_code& e) {
if (e) {
std::cout << "error in HttpServer: " << e << std::endl;
_startAccept();
return;
}
auto connection(std::make_shared<Connection>(std::move(_socket), _handler, _httpParser));
connection->start();
_startAccept();
});
}
boost::asio::io_service _ioService;
boost::asio::basic_socket_acceptor<Protocol> _acceptor;
boost::asio::basic_stream_socket<Protocol> _socket;
const ServerHandler _handler;
const HttpParser _httpParser;
};
}
#endif //TGBOT_HTTPSERVER_H
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