117 lines
4.7 KiB
Nim
117 lines
4.7 KiB
Nim
# Nim-LibP2P
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# Copyright (c) 2022 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/[tables, sequtils]
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import chronos, chronicles
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import ../switch, ../wire
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import ../protocols/rendezvous
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import ../services/autorelayservice
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import ../protocols/connectivity/relay/relay
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import ../protocols/connectivity/autonat/service
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import ../protocols/connectivity/dcutr/[client, server]
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import ../multicodec
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logScope:
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topics = "libp2p hpservice"
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type
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HPService* = ref object of Service
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newConnectedPeerHandler: PeerEventHandler
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onNewStatusHandler: StatusAndConfidenceHandler
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autoRelayService: AutoRelayService
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autonatService: AutonatService
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proc new*(T: typedesc[HPService], autonatService: AutonatService, autoRelayService: AutoRelayService): T =
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return T(autonatService: autonatService, autoRelayService: autoRelayService)
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proc tryStartingDirectConn(self: HPService, switch: Switch, peerId: PeerId): Future[bool] {.async.} =
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proc tryConnect(address: MultiAddress): Future[bool] {.async.} =
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debug "Trying to create direct connection", peerId, address
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await switch.connect(peerId, @[address], true, false)
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debug "Direct connection created."
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return true
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await sleepAsync(500.milliseconds) # wait for AddressBook to be populated
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for address in switch.peerStore[AddressBook][peerId]:
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try:
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let isRelayed = address.contains(multiCodec("p2p-circuit"))
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if not isRelayed.get(false) and address.isPublicMA():
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return await tryConnect(address)
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except CatchableError as err:
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debug "Failed to create direct connection.", err = err.msg
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continue
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return false
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proc closeRelayConn(relayedConn: Connection) {.async.} =
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await sleepAsync(2000.milliseconds) # grace period before closing relayed connection
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await relayedConn.close()
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proc newConnectedPeerHandler(self: HPService, switch: Switch, peerId: PeerId, event: PeerEvent) {.async.} =
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try:
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# Get all connections to the peer. If there is at least one non-relayed connection, return.
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let connections = switch.connManager.getConnections()[peerId].mapIt(it.connection)
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if connections.anyIt(not isRelayed(it)):
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return
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let incomingRelays = connections.filterIt(it.transportDir == Direction.In)
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if incomingRelays.len == 0:
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return
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let relayedConn = incomingRelays[0]
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if await self.tryStartingDirectConn(switch, peerId):
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await closeRelayConn(relayedConn)
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return
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let dcutrClient = DcutrClient.new()
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var natAddrs = switch.peerStore.getMostObservedProtosAndPorts()
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if natAddrs.len == 0:
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natAddrs = switch.peerInfo.listenAddrs.mapIt(switch.peerStore.guessDialableAddr(it))
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await dcutrClient.startSync(switch, peerId, natAddrs)
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await closeRelayConn(relayedConn)
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except CatchableError as err:
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debug "Hole punching failed during dcutr", err = err.msg
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method setup*(self: HPService, switch: Switch): Future[bool] {.async.} =
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var hasBeenSetup = await procCall Service(self).setup(switch)
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hasBeenSetup = hasBeenSetup and await self.autonatService.setup(switch)
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if hasBeenSetup:
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let dcutrProto = Dcutr.new(switch)
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switch.mount(dcutrProto)
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self.newConnectedPeerHandler = proc (peerId: PeerId, event: PeerEvent) {.async.} =
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await newConnectedPeerHandler(self, switch, peerId, event)
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switch.connManager.addPeerEventHandler(self.newConnectedPeerHandler, PeerEventKind.Joined)
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self.onNewStatusHandler = proc (networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
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if networkReachability == NetworkReachability.NotReachable and not self.autoRelayService.isRunning():
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discard await self.autoRelayService.setup(switch)
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elif networkReachability == NetworkReachability.Reachable and self.autoRelayService.isRunning():
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discard await self.autoRelayService.stop(switch)
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# We do it here instead of in the AutonatService because this is useful only when hole punching.
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for t in switch.transports:
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t.networkReachability = networkReachability
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self.autonatService.statusAndConfidenceHandler(self.onNewStatusHandler)
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return hasBeenSetup
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method run*(self: HPService, switch: Switch) {.async, public.} =
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await self.autonatService.run(switch)
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method stop*(self: HPService, switch: Switch): Future[bool] {.async, public.} =
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discard await self.autonatService.stop(switch)
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if not isNil(self.newConnectedPeerHandler):
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switch.connManager.removePeerEventHandler(self.newConnectedPeerHandler, PeerEventKind.Joined)
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