nim-libp2p/libp2p/stream/connection.nim

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## Nim-LibP2P
## Copyright (c) 2020 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import hashes
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import chronicles, chronos, metrics
import lpstream,
../multiaddress,
../peerinfo
export lpstream
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logScope:
topics = "connection"
const
ConnectionTrackerName* = "libp2p.connection"
type
Direction* {.pure.} = enum
None, In, Out
Connection* = ref object of LPStream
peerInfo*: PeerInfo
observedAddr*: Multiaddress
dir*: Direction
ConnectionTracker* = ref object of TrackerBase
opened*: uint64
closed*: uint64
proc setupConnectionTracker(): ConnectionTracker {.gcsafe.}
proc getConnectionTracker*(): ConnectionTracker {.gcsafe.} =
result = cast[ConnectionTracker](getTracker(ConnectionTrackerName))
if isNil(result):
result = setupConnectionTracker()
proc dumpTracking(): string {.gcsafe.} =
var tracker = getConnectionTracker()
result = "Opened conns: " & $tracker.opened & "\n" &
"Closed conns: " & $tracker.closed
proc leakTransport(): bool {.gcsafe.} =
var tracker = getConnectionTracker()
result = (tracker.opened != tracker.closed)
proc setupConnectionTracker(): ConnectionTracker =
result = new ConnectionTracker
result.opened = 0
result.closed = 0
result.dump = dumpTracking
result.isLeaked = leakTransport
addTracker(ConnectionTrackerName, result)
proc init*(C: type Connection,
peerInfo: PeerInfo,
dir: Direction): Connection =
result = C(peerInfo: peerInfo, dir: dir)
result.initStream()
method initStream*(s: Connection) =
if s.objName.len == 0:
s.objName = "Connection"
procCall LPStream(s).initStream()
s.closeEvent = newAsyncEvent()
inc getConnectionTracker().opened
method close*(s: Connection) {.async.} =
if not s.isClosed:
await procCall LPStream(s).close()
inc getConnectionTracker().closed
proc `$`*(conn: Connection): string =
if not isNil(conn.peerInfo):
result = conn.peerInfo.id
func hash*(p: Connection): Hash =
cast[pointer](p).hash