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#pragma once
#include <boost/asio.hpp>
#include <http_parser.h>
#include <atomic>
#include <boost/asio.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include "parser.h"
#include "http_response.h"
namespace flask
{
using namespace boost;
using tcp = asio::ip::tcp;
template <typename Handler>
class Connection
{
public:
Connection(tcp::socket&& socket, Handler* handler) : socket_(std::move(socket)), handler_(handler), parser_(this)
{
}
void start()
{
do_read();
}
void handle()
{
request req = parser_.to_request();
res = handler_->handle(req);
static std::string seperator = ": ";
static std::string crlf = "\r\n";
std::vector<boost::asio::const_buffer> buffers;
buffers.push_back(boost::asio::buffer(statusCodes[res.status]));
bool has_content_length = false;
for(auto& kv : res.headers)
{
buffers.push_back(boost::asio::buffer(kv.first));
buffers.push_back(boost::asio::buffer(seperator));
buffers.push_back(boost::asio::buffer(kv.second));
buffers.push_back(boost::asio::buffer(crlf));
if (boost::iequals(kv.first, "content-length"))
has_content_length = true;
}
if (!has_content_length)
close_connection_ = true;
buffers.push_back(boost::asio::buffer(crlf));
buffers.push_back(boost::asio::buffer(res.body));
do_write(buffers);
}
private:
void do_read()
{
life_++;
socket_.async_read_some(boost::asio::buffer(buffer_),
[this](boost::system::error_code ec, std::size_t bytes_transferred)
{
if (!ec)
{
bool ret = parser_.feed(buffer_.data(), bytes_transferred);
do_read();
}
else
{
bool ret = parser_.done();
socket_.close();
life_--;
if ((int)life_ == 0)
{
delete this;
}
}
});
}
void do_write(const std::vector<boost::asio::const_buffer>& buffers)
{
life_++;
boost::asio::async_write(socket_, buffers,
[this](const boost::system::error_code& ec, std::size_t bytes_transferred)
{
bool should_close = false;
if (!ec)
{
if (close_connection_)
{
should_close = true;
}
}
else
{
should_close = true;
}
if (should_close)
{
socket_.close();
life_--;
if ((int)life_ == 0)
{
delete this;
}
}
});
}
private:
tcp::socket socket_;
Handler* handler_;
std::array<char, 8192> buffer_;
HTTPParser<Connection> parser_;
response res;
std::atomic<int> life_;
bool close_connection_ = false;
};
}
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