1 /* Copyright (c) 2012-2019. 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_HPP
8 #define BITTORRENT_PEER_HPP
9 #include "s4u-bittorrent.hpp"
11 #include <unordered_map>
16 simgrid::s4u::MailboxPtr mailbox_;
17 unsigned int bitfield = 0U; // Fields
18 // int messages_count;
19 double peer_speed = 0;
20 double last_unchoke = 0;
21 int current_piece = -1;
22 bool am_interested = false; // Indicates if we are interested in something the peer has
23 bool interested = false; // Indicates if the peer is interested in one of our pieces
24 bool choked_upload = true; // Indicates if the peer is choked for the current peer
25 bool choked_download = true; // Indicates if the peer has choked the current peer
27 explicit Connection(int id) : id(id), mailbox_(simgrid::s4u::Mailbox::by_name(std::to_string(id))){};
28 ~Connection() = default;
29 void addSpeedValue(double speed) { peer_speed = peer_speed * 0.6 + speed * 0.4; }
30 bool hasPiece(unsigned int piece) { return bitfield & 1U << piece; }
37 simgrid::s4u::MailboxPtr mailbox_;
38 std::unordered_map<int, Connection*> connected_peers;
39 std::set<Connection*> active_peers; // active peers list
41 unsigned int bitfield_ = 0; // list of pieces the peer has.
42 unsigned long long bitfield_blocks = 0; // list of blocks the peer has.
43 short* pieces_count = nullptr; // number of peers that have each piece.
44 unsigned int current_pieces = 0; // current pieces the peer is downloading
45 double begin_receive_time = 0; // time when the receiving communication has begun, useful for calculating host speed.
46 int round_ = 0; // current round for the chocking algorithm.
48 simgrid::s4u::CommPtr comm_received = nullptr; // current comm
49 Message* message = nullptr; // current message being received
51 explicit Peer(std::vector<std::string> args);
52 Peer(const Peer&) = delete;
53 Peer& operator=(const Peer&) = delete;
57 std::string getStatus();
59 int nbInterestedPeers();
60 bool isInterestedBy(Connection* remote_peer);
61 bool isInterestedByFree(Connection* remote_peer);
62 void updateActivePeersSet(Connection* remote_peer);
63 void updateInterestedAfterReceive();
64 void updateChokedPeers();
66 bool hasNotPiece(unsigned int piece) { return not(bitfield_ & 1U << piece); }
67 bool hasCompletedPiece(unsigned int piece);
68 unsigned int countPieces(unsigned int bitfield);
69 /** Check that a piece is not currently being download by the peer. */
70 bool isNotDownloadingPiece(unsigned int piece) { return not(current_pieces & 1U << piece); }
71 int partiallyDownloadedPiece(Connection* remote_peer);
72 void updatePiecesCountFromBitfield(unsigned int bitfield);
73 void removeCurrentPiece(Connection* remote_peer, unsigned int current_piece);
74 void updateBitfieldBlocks(int piece, int block_index, int block_length);
75 int getFirstMissingBlockFrom(int piece);
76 int selectPieceToDownload(Connection* remote_peer);
77 void requestNewPieceTo(Connection* remote_peer);
79 bool getPeersFromTracker();
80 void sendMessage(simgrid::s4u::MailboxPtr mailbox, e_message_type type, uint64_t size);
81 void sendBitfield(simgrid::s4u::MailboxPtr mailbox);
82 void sendPiece(simgrid::s4u::MailboxPtr mailbox, unsigned int piece, int block_index, int block_length);
83 void sendHandshakeToAllPeers();
84 void sendHaveToAllPeers(unsigned int piece);
85 void sendRequestTo(Connection* remote_peer, unsigned int piece);
92 #endif /* BITTORRENT_PEER_HPP */