1 /* Copyright (c) 2012-2016. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #ifndef BITTORRENT_PEER_H
8 #define BITTORRENT_PEER_H
9 #include <simgrid/msg.h>
11 #include <xbt/dynar.h>
12 #include <xbt/RngStream.h>
13 #include "connection.h"
14 #include "bittorrent.h"
17 typedef struct s_peer {
20 unsigned int bitfield; //list of pieces the peer has.
21 unsigned long long bitfield_blocks; //list of blocks the peer has.
22 short *pieces_count; //number of peers that have each piece.
24 unsigned int current_pieces; //current pieces the peer is downloading
26 xbt_dict_t peers; //peers list
27 xbt_dict_t active_peers; //active peers list
28 int round; //current round for the chocking algorithm.
30 char mailbox[MAILBOX_SIZE]; //peer mailbox.
31 char mailbox_tracker[MAILBOX_SIZE]; //pair mailbox while communicating with the tracker.
32 const char *hostname; //peer hostname
34 msg_task_t task_received; //current task being received
35 msg_comm_t comm_received; //current comm
37 RngStream stream; //RngStream for
39 double begin_receive_time; //time when the receiving communication has begun, useful for calculating host speed.
41 typedef s_peer_t *peer_t;
43 /** Peer main function */
44 int peer(int argc, char *argv[]);
45 void get_status(char **status, unsigned int bitfield);
47 int get_peers_data(peer_t peer);
48 void leech_loop(peer_t peer, double deadline);
49 void seed_loop(peer_t peer, double deadline);
51 peer_t peer_init(int id, int seed);
52 void peer_free(peer_t peer);
54 char* print_bitfield(unsigned int bitfield);
55 int has_finished(unsigned int bitfield);
57 void handle_message(peer_t peer, msg_task_t task);
59 void update_pieces_count_from_bitfield(peer_t peer, unsigned int bitfield);
60 void update_choked_peers(peer_t peer);
62 void update_interested_after_receive(peer_t peer);
64 void update_bitfield_blocks(peer_t peer, int index, int block_index, int block_length);
65 int piece_complete(peer_t peer, int index);
66 int get_first_block(peer_t peer, int piece);
68 int peer_has_not_piece(peer_t peer, unsigned int piece);
69 int peer_is_not_downloading_piece(peer_t peer, unsigned int piece);
70 int count_pieces(unsigned int bitfield);
72 int nb_interested_peers(peer_t peer);
73 int is_interested(peer_t peer, connection_t remote_peer);
74 int is_interested_and_free(peer_t peer, connection_t remote_peer);
75 int partially_downloaded_piece(peer_t peer, connection_t remote_peer);
77 void request_new_piece_to_peer(peer_t peer, connection_t remote_peer);
78 void send_request_to_peer(peer_t peer, connection_t remote_peer, int piece);
79 void remove_current_piece(peer_t peer, connection_t remote_peer, unsigned int current_piece);
81 void update_active_peers_set(peer_t peer, connection_t remote_peer);
82 int select_piece_to_download(peer_t peer, connection_t remote_peer);
84 void send_handshake_all(peer_t peer);
86 void send_interested(peer_t peer, const char *mailbox);
88 void send_notinterested(peer_t peer, const char *mailbox);
89 void send_handshake(peer_t peer, const char *mailbox);
90 void send_bitfield(peer_t peer, const char *mailbox);
91 void send_choked(peer_t peer, const char *mailbox);
92 void send_unchoked(peer_t peer, const char *mailbox);
93 void send_have(peer_t peer, int piece);
95 void send_request(peer_t peer, const char *mailbox, int piece, int block_index, int block_length);
96 void send_piece(peer_t peer, const char *mailbox, int piece, int block_index, int block_length);
98 #endif /* BITTORRENT_PEER_H */