http_session.h

/*
 * Copyright (c) 2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include <hicn/transport/core/packet.h>
 
#include "http_1x_message_fast_parser.h"
 
#define ASIO_STANDALONE
#include <asio.hpp>
#include <deque>
#include <functional>
 
namespace transport {
 
using asio::ip::tcp;
 
struct Metadata;
 
typedef std::function<void(const uint8_t *data, std::size_t size, bool is_last,
                           bool headers, Metadata *metadata)>
    ContentReceivedCallback;
typedef std::function<bool(asio::ip::tcp::socket &socket)> OnConnectionClosed;
typedef std::function<void()> ContentSentCallback;
typedef std::deque<
    std::pair<std::unique_ptr<utils::MemBuf>, ContentSentCallback>>
    BufferQueue;
 
struct Metadata {
  std::string http_version;
  HTTPHeaders headers;
};
 
struct RequestMetadata : Metadata {
  std::string method;
  std::string path;
};
 
struct ResponseMetadata : Metadata {
  std::string status_code;
  std::string status_string;
};
 
class HTTPClientConnectionCallback;
 
class HTTPSession {
  friend class HTTPClientConnectionCallback;
  static constexpr uint32_t buffer_size = 1024 * 512;
 
  enum class ConnectorState {
    CLOSED,
    CONNECTING,
    CONNECTED,
  };
 
 public:
  HTTPSession(asio::io_service &io_service, std::string &ip_address,
              std::string &port, ContentReceivedCallback receive_callback,
              OnConnectionClosed on_reconnect_callback, bool client = false);
 
  HTTPSession(asio::ip::tcp::socket socket,
              ContentReceivedCallback receive_callback,
              OnConnectionClosed on_reconnect_callback, bool client = true);
 
  ~HTTPSession();
 
  void send(const uint8_t *buffer, std::size_t len,
            ContentSentCallback &&content_sent = 0);
 
  void send(utils::MemBuf *buffer, ContentSentCallback &&content_sent);
 
  void close();
 
 private:
  void doConnect();
 
  void doReadHeader();
 
  void doReadBody(std::size_t body_size, std::size_t additional_bytes);
 
  void doReadChunkedHeader();
 
  void doWrite();
 
  bool checkConnected();
 
 private:
  void handleRead(std::error_code ec, std::size_t length);
  void tryReconnection();
  void startConnectionTimer();
  void handleDeadline(const std::error_code &ec);
 
  asio::io_service &io_service_;
  asio::ip::tcp::socket socket_;
  asio::ip::tcp::resolver resolver_;
  asio::ip::tcp::resolver::iterator endpoint_iterator_;
  asio::steady_timer timer_;
 
  BufferQueue write_msgs_;
 
  asio::streambuf input_buffer_;
 
  bool reverse_;
  bool is_reconnection_;
  bool data_available_;
 
  std::size_t content_length_;
 
  // Chunked encoding
  bool is_last_chunk_;
  bool chunked_;
 
  ContentReceivedCallback receive_callback_;
  OnConnectionClosed on_connection_closed_callback_;
 
  // HTTP headers
  std::unique_ptr<Metadata> header_info_;
 
  // Connector state
  ConnectorState state_;
};
 
}  // namespace transport