global.go

   1 package torrent
   2
   3 import (
   4         "crypto"
   5         "expvar"
   6
   7         pp "github.com/anacrolix/torrent/peer_protocol"
   8 )
   9
  10 const (
  11         pieceHash        = crypto.SHA1
  12         defaultChunkSize = 0x4000 // 16KiB
  13
  14         // Arbitrary maximum of "metadata_size" (see https://www.bittorrent.org/beps/bep_0009.html)
  15         // libtorrent-rasterbar uses 4MiB at last check. TODO: Add links to values used by other
  16         // implementations here. I saw 14143527 in the metainfo for
  17         // 3597f16e239aeb8f8524a1a1c4e4725a0a96b470. Large values for legitimate torrents should be
  18         // recorded here for consideration.
  19         maxMetadataSize uint32 = 16 * 1024 * 1024
  20 )
  21
  22 // These are our extended message IDs. Peers will use these values to
  23 // select which extension a message is intended for.
  24 const (
  25         metadataExtendedId = iota + 1 // 0 is reserved for deleting keys
  26         pexExtendedId
  27         utHolepunchExtendedId
  28 )
  29
  30 func defaultPeerExtensionBytes() PeerExtensionBits {
  31         return pp.NewPeerExtensionBytes(pp.ExtensionBitDht, pp.ExtensionBitLtep, pp.ExtensionBitFast)
  32 }
  33
  34 func init() {
  35         torrent.Set("peers supporting extension", &peersSupportingExtension)
  36         torrent.Set("chunks received", &chunksReceived)
  37 }
  38
  39 // I could move a lot of these counters to their own file, but I suspect they
  40 // may be attached to a Client someday.
  41 var (
  42         torrent                  = expvar.NewMap("torrent")
  43         peersSupportingExtension expvar.Map
  44         chunksReceived           expvar.Map
  45
  46         pieceHashedCorrect    = expvar.NewInt("pieceHashedCorrect")
  47         pieceHashedNotCorrect = expvar.NewInt("pieceHashedNotCorrect")
  48
  49         completedHandshakeConnectionFlags = expvar.NewMap("completedHandshakeConnectionFlags")
  50         // Count of connections to peer with same client ID.
  51         connsToSelf        = expvar.NewInt("connsToSelf")
  52         receivedKeepalives = expvar.NewInt("receivedKeepalives")
  53         // Requests received for pieces we don't have.
  54         requestsReceivedForMissingPieces = expvar.NewInt("requestsReceivedForMissingPieces")
  55         requestedChunkLengths            = expvar.NewMap("requestedChunkLengths")
  56
  57         messageTypesReceived = expvar.NewMap("messageTypesReceived")
  58
  59         // Track the effectiveness of Torrent.connPieceInclinationPool.
  60         pieceInclinationsReused = expvar.NewInt("pieceInclinationsReused")
  61         pieceInclinationsNew    = expvar.NewInt("pieceInclinationsNew")
  62         pieceInclinationsPut    = expvar.NewInt("pieceInclinationsPut")
  63
  64         concurrentChunkWrites = expvar.NewInt("torrentConcurrentChunkWrites")
  65 )