132 lines
3.7 KiB
Nim
132 lines
3.7 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2020 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import std/[hashes, oids, strformat]
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import chronicles, chronos, metrics
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import lpstream,
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../multiaddress,
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../peerinfo
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export lpstream, peerinfo
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logScope:
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topics = "connection"
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const
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ConnectionTrackerName* = "Connection"
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DefaultConnectionTimeout* = 5.minutes
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type
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TimeoutHandler* = proc(): Future[void] {.gcsafe.}
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Connection* = ref object of LPStream
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activity*: bool # reset every time data is sent or received
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timeout*: Duration # channel timeout if no activity
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timerTaskFut: Future[void] # the current timer instance
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timeoutHandler*: TimeoutHandler # timeout handler
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peerInfo*: PeerInfo
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observedAddr*: Multiaddress
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proc timeoutMonitor(s: Connection) {.async, gcsafe.}
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func shortLog*(conn: Connection): string =
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if conn.isNil: "Connection(nil)"
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elif conn.peerInfo.isNil: $conn.oid
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else: &"{shortLog(conn.peerInfo.peerId)}:{conn.oid}"
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chronicles.formatIt(Connection): shortLog(it)
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method initStream*(s: Connection) =
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if s.objName.len == 0:
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s.objName = "Connection"
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procCall LPStream(s).initStream()
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doAssert(isNil(s.timerTaskFut))
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if s.timeout > 0.millis:
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trace "Monitoring for timeout", s, timeout = s.timeout
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s.timerTaskFut = s.timeoutMonitor()
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if isNil(s.timeoutHandler):
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s.timeoutHandler = proc(): Future[void] =
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trace "Idle timeout expired, closing connection", s
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s.close()
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method closeImpl*(s: Connection): Future[void] =
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# Cleanup timeout timer
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trace "Closing connection", s
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if not isNil(s.timerTaskFut) and not s.timerTaskFut.finished:
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s.timerTaskFut.cancel()
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s.timerTaskFut = nil
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trace "Closed connection", s
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procCall LPStream(s).closeImpl()
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func hash*(p: Connection): Hash =
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cast[pointer](p).hash
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proc pollActivity(s: Connection): Future[bool] {.async.} =
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if s.closed and s.atEof:
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return false # Done, no more monitoring
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if s.activity:
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s.activity = false
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return true
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# Inactivity timeout happened, call timeout monitor
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trace "Connection timed out", s
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if not(isNil(s.timeoutHandler)):
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trace "Calling timeout handler", s
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try:
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await s.timeoutHandler()
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except CancelledError:
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# timeoutHandler is expected to be fast, but it's still possible that
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# cancellation will happen here - no need to warn about it - we do want to
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# stop the polling however
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debug "Timeout handler cancelled", s
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except CatchableError as exc: # Shouldn't happen
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warn "exception in timeout handler", s, exc = exc.msg
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return false
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proc timeoutMonitor(s: Connection) {.async, gcsafe.} =
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## monitor the channel for inactivity
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##
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## if the timeout was hit, it means that
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## neither incoming nor outgoing activity
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## has been detected and the channel will
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## be reset
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##
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while true:
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try: # Sleep at least once!
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await sleepAsync(s.timeout)
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except CancelledError:
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return
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if not await s.pollActivity():
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return
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proc init*(C: type Connection,
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peerInfo: PeerInfo,
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dir: Direction,
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timeout: Duration = DefaultConnectionTimeout,
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timeoutHandler: TimeoutHandler = nil,
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observedAddr: MultiAddress = MultiAddress()): Connection =
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result = C(peerInfo: peerInfo,
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dir: dir,
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timeout: timeout,
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timeoutHandler: timeoutHandler,
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observedAddr: observedAddr)
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result.initStream()
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