102 lines
3.9 KiB
Go
102 lines
3.9 KiB
Go
package torrent
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import (
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"crypto"
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"expvar"
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"time"
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)
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const (
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pieceHash = crypto.SHA1
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maxRequests = 250 // Maximum pending requests we allow peers to send us.
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defaultChunkSize = 0x4000 // 16KiB
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// Updated occasionally to when there's been some changes to client
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// behaviour in case other clients are assuming anything of us. See also
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// `bep20`.
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extendedHandshakeClientVersion = "go.torrent dev 20150624"
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// Peer ID client identifier prefix. We'll update this occasionally to
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// reflect changes to client behaviour that other clients may depend on.
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// Also see `extendedHandshakeClientVersion`.
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bep20 = "-GT0001-"
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nominalDialTimeout = time.Second * 30
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minDialTimeout = 5 * time.Second
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// Justification for set bits follows.
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//
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// Extension protocol ([5]|=0x10):
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// http://www.bittorrent.org/beps/bep_0010.html
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//
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// Fast Extension ([7]|=0x04):
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// http://bittorrent.org/beps/bep_0006.html.
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// Disabled until AllowedFast is implemented. TODO
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//
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// DHT ([7]|=1):
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// http://www.bittorrent.org/beps/bep_0005.html
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defaultExtensionBytes = "\x00\x00\x00\x00\x00\x10\x00\x01"
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defaultEstablishedConnsPerTorrent = 80
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defaultHalfOpenConnsPerTorrent = 80
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torrentPeersHighWater = 200
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torrentPeersLowWater = 50
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// Limit how long handshake can take. This is to reduce the lingering
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// impact of a few bad apples. 4s loses 1% of successful handshakes that
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// are obtained with 60s timeout, and 5% of unsuccessful handshakes.
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handshakesTimeout = 20 * time.Second
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// These are our extended message IDs. Peers will use these values to
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// select which extension a message is intended for.
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metadataExtendedId = iota + 1 // 0 is reserved for deleting keys
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pexExtendedId
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)
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// I could move a lot of these counters to their own file, but I suspect they
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// may be attached to a Client someday.
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var (
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unwantedChunksReceived = expvar.NewInt("chunksReceivedUnwanted")
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unexpectedChunksReceived = expvar.NewInt("chunksReceivedUnexpected")
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chunksReceived = expvar.NewInt("chunksReceived")
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peersAddedBySource = expvar.NewMap("peersAddedBySource")
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uploadChunksPosted = expvar.NewInt("uploadChunksPosted")
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unexpectedCancels = expvar.NewInt("unexpectedCancels")
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pieceHashedCorrect = expvar.NewInt("pieceHashedCorrect")
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pieceHashedNotCorrect = expvar.NewInt("pieceHashedNotCorrect")
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unsuccessfulDials = expvar.NewInt("dialSuccessful")
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successfulDials = expvar.NewInt("dialUnsuccessful")
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acceptUTP = expvar.NewInt("acceptUTP")
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acceptTCP = expvar.NewInt("acceptTCP")
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acceptReject = expvar.NewInt("acceptReject")
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peerExtensions = expvar.NewMap("peerExtensions")
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completedHandshakeConnectionFlags = expvar.NewMap("completedHandshakeConnectionFlags")
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// Count of connections to peer with same client ID.
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connsToSelf = expvar.NewInt("connsToSelf")
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// Number of completed connections to a client we're already connected with.
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duplicateClientConns = expvar.NewInt("duplicateClientConns")
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receivedKeepalives = expvar.NewInt("receivedKeepalives")
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supportedExtensionMessages = expvar.NewMap("supportedExtensionMessages")
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postedKeepalives = expvar.NewInt("postedKeepalives")
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// Requests received for pieces we don't have.
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requestsReceivedForMissingPieces = expvar.NewInt("requestsReceivedForMissingPieces")
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messageTypesReceived = expvar.NewMap("messageTypesReceived")
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messageTypesSent = expvar.NewMap("messageTypesSent")
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messageTypesPosted = expvar.NewMap("messageTypesPosted")
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// Track the effectiveness of Torrent.connPieceInclinationPool.
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pieceInclinationsReused = expvar.NewInt("pieceInclinationsReused")
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pieceInclinationsNew = expvar.NewInt("pieceInclinationsNew")
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pieceInclinationsPut = expvar.NewInt("pieceInclinationsPut")
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fillBufferSentCancels = expvar.NewInt("fillBufferSentCancels")
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fillBufferSentRequests = expvar.NewInt("fillBufferSentRequests")
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numFillBuffers = expvar.NewInt("numFillBuffers")
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)
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