package torrent import ( "crypto" "expvar" pp "github.com/anacrolix/torrent/peer_protocol" ) const ( pieceHash = crypto.SHA1 defaultChunkSize = 0x4000 // 16KiB // Arbitrary maximum of "metadata_size" (see https://www.bittorrent.org/beps/bep_0009.html) // libtorrent-rasterbar uses 4MiB at last check. TODO: Add links to values used by other // implementations here. I saw 14143527 in the metainfo for // 3597f16e239aeb8f8524a1a1c4e4725a0a96b470. Large values for legitimate torrents should be // recorded here for consideration. maxMetadataSize uint32 = 16 * 1024 * 1024 ) // These are our extended message IDs. Peers will use these values to // select which extension a message is intended for. const ( metadataExtendedId = iota + 1 // 0 is reserved for deleting keys pexExtendedId ) func defaultPeerExtensionBytes() PeerExtensionBits { return pp.NewPeerExtensionBytes(pp.ExtensionBitDHT, pp.ExtensionBitExtended, pp.ExtensionBitFast) } func init() { torrent.Set("peers supporting extension", &peersSupportingExtension) torrent.Set("chunks received", &chunksReceived) } // I could move a lot of these counters to their own file, but I suspect they // may be attached to a Client someday. var ( torrent = expvar.NewMap("torrent") peersSupportingExtension expvar.Map chunksReceived expvar.Map pieceHashedCorrect = expvar.NewInt("pieceHashedCorrect") pieceHashedNotCorrect = expvar.NewInt("pieceHashedNotCorrect") completedHandshakeConnectionFlags = expvar.NewMap("completedHandshakeConnectionFlags") // Count of connections to peer with same client ID. connsToSelf = expvar.NewInt("connsToSelf") receivedKeepalives = expvar.NewInt("receivedKeepalives") // Requests received for pieces we don't have. requestsReceivedForMissingPieces = expvar.NewInt("requestsReceivedForMissingPieces") requestedChunkLengths = expvar.NewMap("requestedChunkLengths") messageTypesReceived = expvar.NewMap("messageTypesReceived") // Track the effectiveness of Torrent.connPieceInclinationPool. pieceInclinationsReused = expvar.NewInt("pieceInclinationsReused") pieceInclinationsNew = expvar.NewInt("pieceInclinationsNew") pieceInclinationsPut = expvar.NewInt("pieceInclinationsPut") concurrentChunkWrites = expvar.NewInt("torrentConcurrentChunkWrites") )