nghttp2/src/asio_http2_handler.h

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2014 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef HTTP2_HANDLER_H
#define HTTP2_HANDLER_H
#include "nghttp2_config.h"
#include <map>
#include <vector>
#include <functional>
#include <string>
#include <boost/array.hpp>
#include <boost/asio.hpp>
#include <nghttp2/nghttp2.h>
#include <nghttp2/asio_http2.h>
namespace nghttp2 {
namespace asio_http2 {
class channel_impl {
public:
channel_impl();
void post(void_cb cb);
void strand(boost::asio::io_service::strand *strand);
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private:
boost::asio::io_service::strand *strand_;
};
namespace server {
class http2_handler;
class http2_stream;
class request_impl {
public:
request_impl();
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const std::vector<header> &headers() const;
const std::string &method() const;
const std::string &scheme() const;
const std::string &authority() const;
const std::string &host() const;
const std::string &path() const;
bool push(std::string method, std::string path,
std::vector<header> headers = {});
bool pushed() const;
bool closed() const;
void on_data(data_cb cb);
void on_end(void_cb cb);
bool run_task(thread_cb start);
void set_header(std::vector<header> headers);
void add_header(std::string name, std::string value);
void method(std::string method);
void scheme(std::string scheme);
void authority(std::string authority);
void host(std::string host);
void path(std::string path);
void pushed(bool f);
void handler(std::weak_ptr<http2_handler> h);
void stream(std::weak_ptr<http2_stream> s);
void call_on_data(const uint8_t *data, std::size_t len);
void call_on_end();
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private:
std::vector<header> headers_;
std::string method_;
std::string scheme_;
std::string authority_;
std::string host_;
std::string path_;
data_cb on_data_cb_;
void_cb on_end_cb_;
std::weak_ptr<http2_handler> handler_;
std::weak_ptr<http2_stream> stream_;
bool pushed_;
};
class response_impl {
public:
response_impl();
void write_head(unsigned int status_code, std::vector<header> headers = {});
void end(std::string data = "");
void end(read_cb cb);
void resume();
bool closed() const;
unsigned int status_code() const;
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const std::vector<header> &headers() const;
bool started() const;
void handler(std::weak_ptr<http2_handler> h);
void stream(std::weak_ptr<http2_stream> s);
read_cb::result_type call_read(uint8_t *data, std::size_t len);
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private:
std::vector<header> headers_;
read_cb read_cb_;
std::weak_ptr<http2_handler> handler_;
std::weak_ptr<http2_stream> stream_;
unsigned int status_code_;
bool started_;
};
class http2_stream {
public:
http2_stream(int32_t stream_id);
int32_t get_stream_id() const;
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const std::shared_ptr<request> &get_request();
const std::shared_ptr<response> &get_response();
private:
std::shared_ptr<request> request_;
std::shared_ptr<response> response_;
int32_t stream_id_;
};
struct callback_guard {
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callback_guard(http2_handler &h);
~callback_guard();
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http2_handler &handler;
};
typedef std::function<void(void)> connection_write;
class http2_handler : public std::enable_shared_from_this<http2_handler> {
public:
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http2_handler(boost::asio::io_service &io_service,
boost::asio::io_service &task_io_service,
connection_write writefun, request_cb cb);
~http2_handler();
int start();
std::shared_ptr<http2_stream> create_stream(int32_t stream_id);
void close_stream(int32_t stream_id);
std::shared_ptr<http2_stream> find_stream(int32_t stream_id);
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void call_on_request(http2_stream &stream);
bool should_stop() const;
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int start_response(http2_stream &stream);
void stream_error(int32_t stream_id, uint32_t error_code);
void initiate_write();
void enter_callback();
void leave_callback();
bool inside_callback() const;
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void resume(http2_stream &stream);
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int push_promise(http2_stream &stream, std::string method, std::string path,
std::vector<header> headers);
bool run_task(thread_cb start);
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boost::asio::io_service &io_service();
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template <size_t N>
int on_read(const boost::array<uint8_t, N> &buffer, std::size_t len) {
callback_guard cg(*this);
int rv;
rv = nghttp2_session_mem_recv(session_, buffer.data(), len);
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if (rv < 0) {
return -1;
}
return 0;
}
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template <size_t N>
int on_write(boost::array<uint8_t, N> &buffer, std::size_t &len) {
callback_guard cg(*this);
len = 0;
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if (buf_) {
std::copy(buf_, buf_ + buflen_, std::begin(buffer));
len += buflen_;
buf_ = nullptr;
buflen_ = 0;
}
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for (;;) {
const uint8_t *data;
auto nread = nghttp2_session_mem_send(session_, &data);
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if (nread < 0) {
return -1;
}
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if (nread == 0) {
break;
}
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if (len + nread > buffer.size()) {
buf_ = data;
buflen_ = nread;
break;
}
std::copy(data, data + nread, std::begin(buffer) + len);
len += nread;
}
return 0;
}
private:
std::map<int32_t, std::shared_ptr<http2_stream>> streams_;
connection_write writefun_;
request_cb request_cb_;
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boost::asio::io_service &io_service_;
boost::asio::io_service &task_io_service_;
std::shared_ptr<boost::asio::io_service::strand> strand_;
nghttp2_session *session_;
const uint8_t *buf_;
std::size_t buflen_;
bool inside_callback_;
};
} // namespace server
} // namespace asio_http2
} // namespace nghttp
#endif // HTTP2_HANDLER_H