package torrent import ( "crypto" "expvar" ) const ( pieceHash = crypto.SHA1 maxRequests = 250 // Maximum pending requests we allow peers to send us. defaultChunkSize = 0x4000 // 16KiB // These are our extended message IDs. Peers will use these values to // select which extension a message is intended for. metadataExtendedId = iota + 1 // 0 is reserved for deleting keys pexExtendedId ) func defaultPeerExtensionBytes() peerExtensionBytes { return newPeerExtensionBytes(ExtensionBitDHT, ExtensionBitExtended, ExtensionBitFast) } // I could move a lot of these counters to their own file, but I suspect they // may be attached to a Client someday. var ( unwantedChunksReceived = expvar.NewInt("chunksReceivedUnwanted") unexpectedChunksReceived = expvar.NewInt("chunksReceivedUnexpected") chunksReceived = expvar.NewInt("chunksReceived") torrent = expvar.NewMap("torrent") peersAddedBySource = expvar.NewMap("peersAddedBySource") pieceHashedCorrect = expvar.NewInt("pieceHashedCorrect") pieceHashedNotCorrect = expvar.NewInt("pieceHashedNotCorrect") unsuccessfulDials = expvar.NewInt("dialSuccessful") successfulDials = expvar.NewInt("dialUnsuccessful") peerExtensions = expvar.NewMap("peerExtensions") completedHandshakeConnectionFlags = expvar.NewMap("completedHandshakeConnectionFlags") // Count of connections to peer with same client ID. connsToSelf = expvar.NewInt("connsToSelf") // Number of completed connections to a client we're already connected with. duplicateClientConns = expvar.NewInt("duplicateClientConns") receivedKeepalives = expvar.NewInt("receivedKeepalives") supportedExtensionMessages = expvar.NewMap("supportedExtensionMessages") postedKeepalives = expvar.NewInt("postedKeepalives") // Requests received for pieces we don't have. requestsReceivedForMissingPieces = expvar.NewInt("requestsReceivedForMissingPieces") requestedChunkLengths = expvar.NewMap("requestedChunkLengths") messageTypesReceived = expvar.NewMap("messageTypesReceived") messageTypesSent = expvar.NewMap("messageTypesSent") messageTypesPosted = expvar.NewMap("messageTypesPosted") // Track the effectiveness of Torrent.connPieceInclinationPool. pieceInclinationsReused = expvar.NewInt("pieceInclinationsReused") pieceInclinationsNew = expvar.NewInt("pieceInclinationsNew") pieceInclinationsPut = expvar.NewInt("pieceInclinationsPut") fillBufferSentCancels = expvar.NewInt("fillBufferSentCancels") fillBufferSentRequests = expvar.NewInt("fillBufferSentRequests") numFillBuffers = expvar.NewInt("numFillBuffers") )