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 func defaultPeerExtensionBytes() PeerExtensionBits {
  23         return pp.NewPeerExtensionBytes(pp.ExtensionBitDht, pp.ExtensionBitLtep, pp.ExtensionBitFast)
  24 }
  25
  26 func init() {
  27         torrent.Set("peers supporting extension", &peersSupportingExtension)
  28         torrent.Set("chunks received", &chunksReceived)
  29 }
  30
  31 // I could move a lot of these counters to their own file, but I suspect they
  32 // may be attached to a Client someday.
  33 var (
  34         torrent                  = expvar.NewMap("torrent")
  35         peersSupportingExtension expvar.Map
  36         chunksReceived           expvar.Map
  37
  38         pieceHashedCorrect    = expvar.NewInt("pieceHashedCorrect")
  39         pieceHashedNotCorrect = expvar.NewInt("pieceHashedNotCorrect")
  40
  41         completedHandshakeConnectionFlags = expvar.NewMap("completedHandshakeConnectionFlags")
  42         // Count of connections to peer with same client ID.
  43         connsToSelf        = expvar.NewInt("connsToSelf")
  44         receivedKeepalives = expvar.NewInt("receivedKeepalives")
  45         // Requests received for pieces we don't have.
  46         requestsReceivedForMissingPieces = expvar.NewInt("requestsReceivedForMissingPieces")
  47         requestedChunkLengths            = expvar.NewMap("requestedChunkLengths")
  48
  49         messageTypesReceived = expvar.NewMap("messageTypesReceived")
  50
  51         // Track the effectiveness of Torrent.connPieceInclinationPool.
  52         pieceInclinationsReused = expvar.NewInt("pieceInclinationsReused")
  53         pieceInclinationsNew    = expvar.NewInt("pieceInclinationsNew")
  54         pieceInclinationsPut    = expvar.NewInt("pieceInclinationsPut")
  55
  56         concurrentChunkWrites = expvar.NewInt("torrentConcurrentChunkWrites")
  57 )