90 lines
3.4 KiB
Nim
90 lines
3.4 KiB
Nim
# Nim-LibP2P
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# Copyright (c) 2023 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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{.push raises: [].}
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import std/sequtils
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import stew/results
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import chronos, chronicles
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import core
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import ../../protocol,
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../../../stream/connection,
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../../../switch,
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../../../utils/future
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export DcutrError
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type
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DcutrClient* = ref object
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connectTimeout: Duration
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maxDialableAddrs: int
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logScope:
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topics = "libp2p dcutrclient"
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proc new*(T: typedesc[DcutrClient], connectTimeout = 15.seconds, maxDialableAddrs = 8): T =
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return T(connectTimeout: connectTimeout, maxDialableAddrs: maxDialableAddrs)
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proc startSync*(self: DcutrClient, switch: Switch, remotePeerId: PeerId, addrs: seq[MultiAddress]) {.async.} =
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logScope:
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peerId = switch.peerInfo.peerId
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var
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peerDialableAddrs: seq[MultiAddress]
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stream: Connection
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try:
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var ourDialableAddrs = getHolePunchableAddrs(addrs)
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if ourDialableAddrs.len == 0:
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debug "Dcutr initiator has no supported dialable addresses. Aborting Dcutr.", addrs
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return
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stream = await switch.dial(remotePeerId, DcutrCodec)
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await stream.send(MsgType.Connect, addrs)
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debug "Dcutr initiator has sent a Connect message."
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let rttStart = Moment.now()
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let connectAnswer = DcutrMsg.decode(await stream.readLp(1024))
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peerDialableAddrs = getHolePunchableAddrs(connectAnswer.addrs)
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if peerDialableAddrs.len == 0:
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debug "Dcutr receiver has no supported dialable addresses to connect to. Aborting Dcutr.", addrs=connectAnswer.addrs
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return
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let rttEnd = Moment.now()
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debug "Dcutr initiator has received a Connect message back.", connectAnswer
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let halfRtt = (rttEnd - rttStart) div 2'i64
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await stream.send(MsgType.Sync, @[])
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debug "Dcutr initiator has sent a Sync message."
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await sleepAsync(halfRtt)
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if peerDialableAddrs.len > self.maxDialableAddrs:
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peerDialableAddrs = peerDialableAddrs[0..<self.maxDialableAddrs]
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var futs = peerDialableAddrs.mapIt(switch.connect(stream.peerId, @[it], forceDial = true, reuseConnection = false, dir = Direction.In))
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try:
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discard await anyCompleted(futs).wait(self.connectTimeout)
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debug "Dcutr initiator has directly connected to the remote peer."
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finally:
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for fut in futs: fut.cancel()
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except CancelledError as err:
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raise err
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except AllFuturesFailedError as err:
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debug "Dcutr initiator could not connect to the remote peer, all connect attempts failed", peerDialableAddrs, msg = err.msg
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raise newException(DcutrError, "Dcutr initiator could not connect to the remote peer, all connect attempts failed", err)
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except AsyncTimeoutError as err:
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debug "Dcutr initiator could not connect to the remote peer, all connect attempts timed out", peerDialableAddrs, msg = err.msg
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raise newException(DcutrError, "Dcutr initiator could not connect to the remote peer, all connect attempts timed out", err)
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except CatchableError as err:
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debug "Unexpected error when Dcutr initiator tried to connect to the remote peer", err = err.msg
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raise newException(DcutrError, "Unexpected error when Dcutr initiator tried to connect to the remote peer", err)
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finally:
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if stream != nil:
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await stream.close()
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