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 int pieces; //number of pieces the peer has.
21 char *bitfield; //list of pieces the peer has.
22 char *bitfield_blocks; //list of blocks the peer has.
23 short *pieces_count; //number of peers that have each piece.
25 xbt_dynar_t current_pieces; //current pieces the peer is downloading
27 xbt_dict_t peers; //peers list
28 xbt_dict_t active_peers; //active peers list
29 int round; //current round for the chocking algorithm.
32 char mailbox[MAILBOX_SIZE]; //peer mailbox.
33 char mailbox_tracker[MAILBOX_SIZE]; //pair mailbox while communicating with the tracker.
34 const char *hostname; //peer hostname
36 msg_task_t task_received; //current task being received
37 msg_comm_t comm_received; //current comm
40 RngStream stream; //RngStream for
42 double begin_receive_time; //time when the receiving communication has begun, useful for calculating host speed.
45 typedef s_peer_t *peer_t;
47 /** Peer main function */
48 int peer(int argc, char *argv[]);
50 int get_peers_data(peer_t peer);
51 void leech_loop(peer_t peer, double deadline);
52 void seed_loop(peer_t peer, double deadline);
54 void peer_init(peer_t peer, int id, int seed);
55 void peer_free(peer_t peer);
57 int has_finished(char *bitfield);
59 void handle_message(peer_t peer, msg_task_t task);
61 void update_pieces_count_from_bitfield(peer_t peer, char *bitfield);
62 void update_choked_peers(peer_t peer);
64 void update_interested_after_receive(peer_t peer);
66 void update_bitfield_blocks(peer_t peer, int index, int block_index, int block_length);
67 int piece_complete(peer_t peer, int index);
68 int get_first_block(peer_t peer, int piece);
70 int nb_interested_peers(peer_t peer);
71 int is_interested(peer_t peer, connection_t remote_peer);
72 int is_interested_and_free(peer_t peer, connection_t remote_peer);
73 int in_current_pieces(peer_t peer, int piece);
74 int partially_downloaded_piece(peer_t peer, connection_t remote_peer);
76 void request_new_piece_to_peer(peer_t peer, connection_t remote_peer);
77 void send_request_to_peer(peer_t peer, connection_t remote_peer, int piece);
78 void remove_current_piece(peer_t peer, connection_t remote_peer, int current_piece);
80 void update_active_peers_set(peer_t peer, connection_t remote_peer);
81 int select_piece_to_download(peer_t peer, connection_t remote_peer);
83 void send_handshake_all(peer_t peer);
85 void send_interested(peer_t peer, const char *mailbox);
87 void send_notinterested(peer_t peer, const char *mailbox);
88 void send_handshake(peer_t peer, const char *mailbox);
89 void send_bitfield(peer_t peer, const char *mailbox);
90 void send_choked(peer_t peer, const char *mailbox);
91 void send_unchoked(peer_t peer, const char *mailbox);
92 void send_have(peer_t peer, int piece);
94 void send_request(peer_t peer, const char *mailbox, int piece, int block_index, int block_length);
95 void send_piece(peer_t peer, const char *mailbox, int piece, int block_index, int block_length);
97 #endif /* BITTORRENT_PEER_H */