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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 <boost/array.hpp>
#include <boost/lexical_cast.hpp>
#include "parser.h"
#include "http_response.h"
#include "datetime.h"
namespace flask
{
using namespace boost;
using tcp = asio::ip::tcp;
template <typename Handler>
class Connection
{
public:
Connection(tcp::socket&& socket, Handler* handler, const std::string& server_name) : socket_(std::move(socket)), handler_(handler), parser_(this), server_name_(server_name)
{
}
void start()
{
do_read();
}
void handle()
{
static std::unordered_map<int, std::string> statusCodes = {
{200, "HTTP/1.1 200 OK\r\n"},
{201, "HTTP/1.1 201 Created\r\n"},
{202, "HTTP/1.1 202 Accepted\r\n"},
{204, "HTTP/1.1 204 No Content\r\n"},
{300, "HTTP/1.1 300 Multiple Choices\r\n"},
{301, "HTTP/1.1 301 Moved Permanently\r\n"},
{302, "HTTP/1.1 302 Moved Temporarily\r\n"},
{304, "HTTP/1.1 304 Not Modified\r\n"},
{400, "HTTP/1.1 400 Bad Request\r\n"},
{401, "HTTP/1.1 401 Unauthorized\r\n"},
{403, "HTTP/1.1 403 Forbidden\r\n"},
{404, "HTTP/1.1 404 Not Found\r\n"},
{500, "HTTP/1.1 500 Internal Server Error\r\n"},
{501, "HTTP/1.1 501 Not Implemented\r\n"},
{502, "HTTP/1.1 502 Bad Gateway\r\n"},
{503, "HTTP/1.1 503 Service Unavailable\r\n"},
};
request req = parser_.to_request();
if (parser_.http_major == 1 && parser_.http_minor == 0)
{
// HTTP/1.0
if (!(req.headers.count("connection") && boost::iequals(req.headers["connection"],"Keep-Alive")))
close_connection_ = true;
}
else
{
// HTTP/1.1
if (req.headers.count("connection") && req.headers["connection"] == "close")
close_connection_ = true;
}
res = handler_->handle(req);
#ifdef FLASK_ENABLE_LOGGING
std::cerr << "HTTP/" << parser_.http_major << "." << parser_.http_minor << ' ';
std::cerr << method_name(req.method);
std::cerr << " " << res.code << std::endl;
std::cerr << "res body: " << res.body << std::endl;
#endif
static std::string seperator = ": ";
static std::string crlf = "\r\n";
buffers_.clear();
buffers_.reserve(4*(res.headers.size()+4)+3);
if (res.body.empty() && res.json_value.t == json::type::Object)
{
res.body = json::dump(res.json_value);
}
if (!statusCodes.count(res.code))
res.code = 500;
{
auto& status = statusCodes.find(res.code)->second;
buffers_.emplace_back(status.data(), status.size());
}
if (res.code >= 400 && res.body.empty())
res.body = statusCodes[res.code].substr(9);
bool has_content_length = false;
bool has_date = false;
bool has_server = false;
for(auto& kv : res.headers)
{
buffers_.emplace_back(kv.first.data(), kv.first.size());
buffers_.emplace_back(seperator.data(), seperator.size());
buffers_.emplace_back(kv.second.data(), kv.second.size());
buffers_.emplace_back(crlf.data(), crlf.size());
if (boost::iequals(kv.first, "content-length"))
has_content_length = true;
if (boost::iequals(kv.first, "date"))
has_date = true;
if (boost::iequals(kv.first, "server"))
has_server = true;
}
if (!has_content_length)
{
auto ret = res.headers.emplace("Content-Length", boost::lexical_cast<std::string>(res.body.size()));
buffers_.emplace_back(ret.first->first.data(), ret.first->first.size());
buffers_.emplace_back(seperator.data(), seperator.size());
buffers_.emplace_back(ret.first->second.data(), ret.first->second.size());
buffers_.emplace_back(crlf.data(), crlf.size());
}
if (!has_server)
{
auto ret = res.headers.emplace("Server", server_name_);
buffers_.emplace_back(ret.first->first.data(), ret.first->first.size());
buffers_.emplace_back(seperator.data(), seperator.size());
buffers_.emplace_back(ret.first->second.data(), ret.first->second.size());
buffers_.emplace_back(crlf.data(), crlf.size());
}
if (!has_date)
{
std::string date_str = DateTime().str();
auto ret = res.headers.emplace("Date", date_str);
buffers_.emplace_back(ret.first->first.data(), ret.first->first.size());
buffers_.emplace_back(seperator.data(), seperator.size());
buffers_.emplace_back(ret.first->second.data(), ret.first->second.size());
buffers_.emplace_back(crlf.data(), crlf.size());
}
buffers_.emplace_back(crlf.data(), crlf.size());
buffers_.emplace_back(res.body.data(), res.body.size());
do_write();
}
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);
if (ret)
do_read();
else
{
socket_.close();
life_--;
if ((int)life_ == 0)
delete this;
}
}
else
{
parser_.done();
socket_.close();
life_--;
if ((int)life_ == 0)
delete this;
}
});
}
void do_write()
{
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_;
boost::array<char, 8192> buffer_;
HTTPParser<Connection> parser_;
response res;
std::atomic<int> life_;
bool close_connection_ = false;
const std::string& server_name_;
std::vector<boost::asio::const_buffer> buffers_;
};
}
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