global.go

   1 package torrent
   2
   3 import (
   4         "crypto"
   5         "expvar"
   6 )
   7
   8 const (
   9         pieceHash        = crypto.SHA1
  10         maxRequests      = 250    // Maximum pending requests we allow peers to send us.
  11         defaultChunkSize = 0x4000 // 16KiB
  12
  13         // These are our extended message IDs. Peers will use these values to
  14         // select which extension a message is intended for.
  15         metadataExtendedId = iota + 1 // 0 is reserved for deleting keys
  16         pexExtendedId
  17 )
  18
  19 func defaultPeerExtensionBytes() peerExtensionBytes {
  20         return newPeerExtensionBytes(ExtensionBitDHT, ExtensionBitExtended, ExtensionBitFast)
  21 }
  22
  23 // I could move a lot of these counters to their own file, but I suspect they
  24 // may be attached to a Client someday.
  25 var (
  26         unwantedChunksReceived   = expvar.NewInt("chunksReceivedUnwanted")
  27         unexpectedChunksReceived = expvar.NewInt("chunksReceivedUnexpected")
  28         chunksReceived           = expvar.NewInt("chunksReceived")
  29
  30         torrent = expvar.NewMap("torrent")
  31
  32         peersAddedBySource = expvar.NewMap("peersAddedBySource")
  33
  34         pieceHashedCorrect    = expvar.NewInt("pieceHashedCorrect")
  35         pieceHashedNotCorrect = expvar.NewInt("pieceHashedNotCorrect")
  36
  37         peerExtensions                    = expvar.NewMap("peerExtensions")
  38         completedHandshakeConnectionFlags = expvar.NewMap("completedHandshakeConnectionFlags")
  39         // Count of connections to peer with same client ID.
  40         connsToSelf                = expvar.NewInt("connsToSelf")
  41         receivedKeepalives         = expvar.NewInt("receivedKeepalives")
  42         supportedExtensionMessages = expvar.NewMap("supportedExtensionMessages")
  43         postedKeepalives           = expvar.NewInt("postedKeepalives")
  44         // Requests received for pieces we don't have.
  45         requestsReceivedForMissingPieces = expvar.NewInt("requestsReceivedForMissingPieces")
  46         requestedChunkLengths            = expvar.NewMap("requestedChunkLengths")
  47
  48         messageTypesReceived = expvar.NewMap("messageTypesReceived")
  49         messageTypesSent     = expvar.NewMap("messageTypesSent")
  50         messageTypesPosted   = expvar.NewMap("messageTypesPosted")
  51
  52         // Track the effectiveness of Torrent.connPieceInclinationPool.
  53         pieceInclinationsReused = expvar.NewInt("pieceInclinationsReused")
  54         pieceInclinationsNew    = expvar.NewInt("pieceInclinationsNew")
  55         pieceInclinationsPut    = expvar.NewInt("pieceInclinationsPut")
  56
  57         fillBufferSentCancels  = expvar.NewInt("fillBufferSentCancels")
  58         fillBufferSentRequests = expvar.NewInt("fillBufferSentRequests")
  59         numFillBuffers         = expvar.NewInt("numFillBuffers")
  60 )