connection_basic.hpp

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// ! This file might contain variable names same as in template class connection<> 
// ! from files contrib/epee/include/net/abstract_tcp_server2.*
// ! I am not a lawyer; afaik APIs, var names etc are not copyrightable ;)
// ! (how ever if in some wonderful juristdictions that is not the case, then why not make another sub-class withat that members and licence it as epee part)
// ! Working on above premise, IF this is valid in your juristdictions, then consider this code as released as:

// Copyrights(c) 2017-2019, The Electroneum Project
// Copyrights(c) 2014-2017, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
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/* rfree: place for hanlers for the non-template base, can be used by connection<> template class in abstract_tcp_server2 file  */

#ifndef INCLUDED_p2p_connection_basic_hpp
#define INCLUDED_p2p_connection_basic_hpp


#include <boost/asio.hpp>
#include <string>
#include <vector>
#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>
#include <atomic>

#include <boost/asio.hpp>
#include <boost/array.hpp>
#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/interprocess/detail/atomic.hpp>
#include <boost/thread/thread.hpp>

#include <memory>

#include "net/net_utils_base.h"
#include "syncobj.h"

namespace epee
{
namespace net_utils
{

  /************************************************************************/
  /*                                                                      */
  /************************************************************************/

class connection_basic_pimpl; // PIMPL for this class

  enum t_connection_type { // type of the connection (of this server), e.g. so that we will know how to limit it
      e_connection_type_NET = 0, // default (not used?)
      e_connection_type_RPC = 1, // the rpc commands  (probably not rate limited, not chunked, etc)
      e_connection_type_P2P = 2  // to other p2p node (probably limited)
  };
  
  std::string to_string(t_connection_type type);

class connection_basic { // not-templated base class for rapid developmet of some code parts
    public:
        std::unique_ptr< connection_basic_pimpl > mI; // my Implementation

        // moved here from orginal connecton<> - common member variables that do not depend on template in connection<>
    volatile uint32_t m_want_close_connection;
    std::atomic<bool> m_was_shutdown;
    critical_section m_send_que_lock;
    std::list<std::string> m_send_que;
    volatile bool m_is_multithreaded;
    double m_start_time;
    boost::asio::io_service::strand strand_;
    boost::asio::ip::tcp::socket socket_;

        std::atomic<long> &m_ref_sock_count; // reference to external counter of existing sockets that we will ++/--
    public:
        // first counter is the ++/-- count of current sockets, the other socket_number is only-increasing ++ number generator
        connection_basic(boost::asio::io_service& io_service, std::atomic<long> &ref_sock_count, std::atomic<long> &sock_number);

        virtual ~connection_basic() noexcept(false);

        // various handlers to be called from connection class:
        void do_send_handler_write(const void * ptr , size_t cb);
        void do_send_handler_write_from_queue(const boost::system::error_code& e, size_t cb , int q_len); // from handle_write, sending next part

        void logger_handle_net_write(size_t size); // network data written
        void logger_handle_net_read(size_t size); // network data read

        void set_start_time();

        // config for rate limit
        
        static void set_rate_up_limit(uint64_t limit);
        static void set_rate_down_limit(uint64_t limit);
        static uint64_t get_rate_up_limit();
        static uint64_t get_rate_down_limit();

        // config misc
        static void set_tos_flag(int tos); // ToS / QoS flag
        static int get_tos_flag();

        // handlers and sleep
        void sleep_before_packet(size_t packet_size, int phase, int q_len); // execute a sleep ; phase is not really used now(?)
        static void save_limit_to_file(int limit); 
        static double get_sleep_time(size_t cb);
        
        static void set_save_graph(bool save_graph);
};

} // nameserver
} // nameserver

#endif