Keith Winstein
98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
|
|
#ifndef TRANSPORT_SENDER_HPP
|
|
#define TRANSPORT_SENDER_HPP
|
|
|
|
#include <string>
|
|
#include <list>
|
|
|
|
#include "network.hpp"
|
|
#include "transportinstruction.pb.h"
|
|
#include "transportstate.hpp"
|
|
|
|
using namespace std;
|
|
using namespace TransportBuffers;
|
|
|
|
namespace Network {
|
|
template <class MyState>
|
|
class TransportSender
|
|
{
|
|
private:
|
|
/* timing parameters */
|
|
static const int SEND_INTERVAL_MIN = 20; /* ms between frames */
|
|
static const int SEND_INTERVAL_MAX = 250; /* ms between frames */
|
|
static const int ACK_INTERVAL = 1000; /* ms between empty acks */
|
|
static const int ACK_DELAY = 10; /* ms before delayed ack */
|
|
static const int SEND_MINDELAY = 20; /* ms to collect all input */
|
|
static const int HEADER_LEN = 60;
|
|
|
|
/* helper methods for tick() */
|
|
unsigned int send_interval( void );
|
|
void update_assumed_receiver_state( void );
|
|
void rationalize_states( void );
|
|
void send_to_receiver( string diff );
|
|
void send_empty_ack( void );
|
|
void send_in_fragments( string diff, uint64_t new_num, bool send_timestamp = true );
|
|
|
|
/* state of sender */
|
|
Connection *connection;
|
|
|
|
MyState current_state;
|
|
|
|
list< TimestampedState<MyState> > sent_states;
|
|
/* first element: known, acknowledged receiver state */
|
|
/* last element: last sent state */
|
|
|
|
/* somewhere in the middle: the assumed state of the receiver */
|
|
typename list< TimestampedState<MyState> >::iterator assumed_receiver_state;
|
|
|
|
/* for fragment creation */
|
|
uint16_t next_instruction_id;
|
|
Instruction last_instruction_sent;
|
|
|
|
/* timing state */
|
|
uint64_t next_ack_time;
|
|
uint64_t next_send_time;
|
|
|
|
bool verbose;
|
|
bool shutdown_in_progress;
|
|
|
|
/* information about receiver state */
|
|
uint64_t ack_num;
|
|
|
|
public:
|
|
/* constructor */
|
|
TransportSender( Connection *s_connection, MyState &initial_state );
|
|
|
|
/* Send data or an ack if necessary */
|
|
void tick( void );
|
|
|
|
/* Returns the number of ms to wait until next possible event. */
|
|
int wait_time( void );
|
|
|
|
/* Executed upon receipt of ack */
|
|
void process_acknowledgment_through( uint64_t ack_num );
|
|
|
|
/* Executed upon entry to new receiver state */
|
|
void set_ack_num( uint64_t s_ack_num ) { ack_num = s_ack_num; }
|
|
|
|
/* Starts shutdown sequence */
|
|
void start_shutdown( void ) { shutdown_in_progress = true; }
|
|
|
|
/* Misc. getters and setters */
|
|
/* Cannot modify current_state while shutdown in progress */
|
|
MyState &get_current_state( void ) { assert( !shutdown_in_progress ); return current_state; }
|
|
void set_current_state( const MyState &x ) { assert( !shutdown_in_progress ); current_state = x; }
|
|
void set_verbose( void ) { verbose = true; }
|
|
|
|
bool get_shutdown_in_progress( void ) { return shutdown_in_progress; }
|
|
bool get_shutdown_acknowledged( void ) { return sent_states.front().num == uint64_t(-1); }
|
|
bool get_counterparty_shutdown_acknowledged( void ) { return last_instruction_sent.ack_num() == uint64_t(-1); }
|
|
|
|
/* nonexistent methods to satisfy -Weffc++ */
|
|
TransportSender( const TransportSender &x );
|
|
TransportSender & operator=( const TransportSender &x );
|
|
};
|
|
}
|
|
|
|
#endif
|