session.h

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/*! @brief This file have the interface for Session class.
    @file session.h
    @author Alvaro Denis <denisacostaq@gmail.com>
    @date 6/29/2019

    @copyright
    @attention <h1><center><strong>COPYRIGHT &copy; 2019 </strong>
    [<strong>denisacostaq</strong>][denisacostaq-URL].
    All rights reserved.</center></h1>
    @attention This file is part of [<strong>DAQs</strong>][DAQs-URL].

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      notice, this list of conditions and the following disclaimer.
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      may be used to endorse or promote products derived from this software
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    [denisacostaq-URL]: https://about.me/denisacostaq "Alvaro Denis Acosta"
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 */
#ifndef DAQS_DATABASESERVER_SESSION_H
#define DAQS_DATABASESERVER_SESSION_H

#include <cstdlib>
#include <functional>
#include <iostream>
#include <memory>
#include <utility>

#include <messages.pb.h>
#include <boost/asio.hpp>

#include "src/database-server/data-access/idataaccess.h"

class Session : public std::enable_shared_from_this<Session> {
 public:
  Session(boost::asio::ip::tcp::socket socket, IDataAccess* da);

  void start() { do_read(); }

 private:
  void read_header();

  void read_save_value_request(std::size_t b_size);

  void read_get_values_request(std::size_t b_size);

  void read_get_variables_request(std::size_t b_size);

  void read_add_variable_request(std::size_t b_size);

  void read_body(message::MessageType msg_type, std::size_t b_size);

  void do_read() { read_header(); }

  void send_msg(std::shared_ptr<uint8_t> f_buf, std::size_t f_size);

  std::shared_ptr<std::uint8_t> build_f_msg(
      std::unique_ptr<std::uint8_t[]>&& h_buf, std::size_t h_size,
      std::unique_ptr<std::uint8_t[]>&& b_buf, std::size_t b_size);

  std::unique_ptr<std::uint8_t[]> build_h_msg(std::size_t b_size,
                                              message::MessageType msg_type,
                                              std::size_t* out_fh_size);

  std::unique_ptr<std::uint8_t[]> build_b_response(
      const std::string& msg, message::ResponseStatus status,
      std::size_t* out_b_size, message::MessageType* prev_msg = nullptr);

  std::unique_ptr<std::uint8_t[]> build_b_response(
      std::vector<VarValue>&& values, std::size_t* out_b_size);

  std::unique_ptr<std::uint8_t[]> build_b_response(std::vector<Variable>&& vars,
                                                   std::size_t* out_b_size);

  void send_status_response(const std::string& msg,
                            message::ResponseStatus status,
                            message::MessageType* prev_msg = nullptr);

  void send_values_response(std::vector<VarValue>&& values);

  void send_variables_response(std::vector<Variable>&& variables);

  boost::asio::ip::tcp::socket socket_;
  IDataAccess* da_;

  static constexpr size_t max_values_ammount{120};
};

#endif  // DAQS_DATABASESERVER_SESSION_H