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         // This value is 2x what libtorrent-rasterbar uses, which should be plenty
  16         maxMetadataSize uint32 = 8 * 1024 * 1024
  17 )
  18
  19 // These are our extended message IDs. Peers will use these values to
  20 // select which extension a message is intended for.
  21 const (
  22         metadataExtendedId = iota + 1 // 0 is reserved for deleting keys
  23         pexExtendedId
  24 )
  25
  26 func defaultPeerExtensionBytes() PeerExtensionBits {
  27         return pp.NewPeerExtensionBytes(pp.ExtensionBitDHT, pp.ExtensionBitExtended, pp.ExtensionBitFast)
  28 }
  29
  30 func init() {
  31         torrent.Set("peers supporting extension", &peersSupportingExtension)
  32         torrent.Set("chunks received", &chunksReceived)
  33 }
  34
  35 // I could move a lot of these counters to their own file, but I suspect they
  36 // may be attached to a Client someday.
  37 var (
  38         torrent                  = expvar.NewMap("torrent")
  39         peersSupportingExtension expvar.Map
  40         chunksReceived           expvar.Map
  41
  42         pieceHashedCorrect    = expvar.NewInt("pieceHashedCorrect")
  43         pieceHashedNotCorrect = expvar.NewInt("pieceHashedNotCorrect")
  44
  45         completedHandshakeConnectionFlags = expvar.NewMap("completedHandshakeConnectionFlags")
  46         // Count of connections to peer with same client ID.
  47         connsToSelf        = expvar.NewInt("connsToSelf")
  48         receivedKeepalives = expvar.NewInt("receivedKeepalives")
  49         // Requests received for pieces we don't have.
  50         requestsReceivedForMissingPieces = expvar.NewInt("requestsReceivedForMissingPieces")
  51         requestedChunkLengths            = expvar.NewMap("requestedChunkLengths")
  52
  53         messageTypesReceived = expvar.NewMap("messageTypesReceived")
  54
  55         // Track the effectiveness of Torrent.connPieceInclinationPool.
  56         pieceInclinationsReused = expvar.NewInt("pieceInclinationsReused")
  57         pieceInclinationsNew    = expvar.NewInt("pieceInclinationsNew")
  58         pieceInclinationsPut    = expvar.NewInt("pieceInclinationsPut")
  59
  60         concurrentChunkWrites = expvar.NewInt("torrentConcurrentChunkWrites")
  61 )