288 lines
8.1 KiB
Nim
288 lines
8.1 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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## TCP transport implementation
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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 transport,
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../errors,
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../wire,
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../multicodec,
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../connmanager,
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../multiaddress,
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../stream/connection,
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../stream/chronosstream,
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../upgrademngrs/upgrade,
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../utility
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logScope:
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topics = "libp2p tcptransport"
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export transport, results
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const
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TcpTransportTrackerName* = "libp2p.tcptransport"
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type
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TcpTransport* = ref object of Transport
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servers*: seq[StreamServer]
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clients: array[Direction, seq[StreamTransport]]
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flags: set[ServerFlags]
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clientFlags: set[SocketFlags]
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acceptFuts: seq[Future[StreamTransport]]
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connectionsTimeout: Duration
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TcpTransportTracker* = ref object of TrackerBase
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opened*: uint64
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closed*: uint64
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TcpTransportError* = object of transport.TransportError
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proc setupTcpTransportTracker(): TcpTransportTracker {.gcsafe, raises: [].}
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proc getTcpTransportTracker(): TcpTransportTracker {.gcsafe.} =
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result = cast[TcpTransportTracker](getTracker(TcpTransportTrackerName))
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if isNil(result):
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result = setupTcpTransportTracker()
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proc dumpTracking(): string {.gcsafe.} =
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var tracker = getTcpTransportTracker()
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result = "Opened tcp transports: " & $tracker.opened & "\n" &
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"Closed tcp transports: " & $tracker.closed
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proc leakTransport(): bool {.gcsafe.} =
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var tracker = getTcpTransportTracker()
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result = (tracker.opened != tracker.closed)
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proc setupTcpTransportTracker(): TcpTransportTracker =
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result = new TcpTransportTracker
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result.opened = 0
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result.closed = 0
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result.dump = dumpTracking
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result.isLeaked = leakTransport
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addTracker(TcpTransportTrackerName, result)
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proc getObservedAddr(client: StreamTransport): Future[MultiAddress] {.async.} =
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try:
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return MultiAddress.init(client.remoteAddress).tryGet()
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except CatchableError as exc:
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trace "Failed to create observedAddr", exc = exc.msg
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if not(isNil(client) and client.closed):
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await client.closeWait()
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raise exc
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proc connHandler*(self: TcpTransport,
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client: StreamTransport,
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observedAddr: Opt[MultiAddress],
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dir: Direction): Future[Connection] {.async.} =
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trace "Handling tcp connection", address = $observedAddr,
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dir = $dir,
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clients = self.clients[Direction.In].len +
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self.clients[Direction.Out].len
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let conn = Connection(
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ChronosStream.init(
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client = client,
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dir = dir,
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observedAddr = observedAddr,
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timeout = self.connectionsTimeout
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))
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proc onClose() {.async.} =
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try:
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let futs = @[client.join(), conn.join()]
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await futs[0] or futs[1]
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for f in futs:
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if not f.finished: await f.cancelAndWait() # cancel outstanding join()
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trace "Cleaning up client", addrs = $client.remoteAddress,
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conn
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self.clients[dir].keepItIf( it != client )
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await allFuturesThrowing(
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conn.close(), client.closeWait())
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trace "Cleaned up client", addrs = $client.remoteAddress,
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conn
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except CatchableError as exc:
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let useExc {.used.} = exc
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debug "Error cleaning up client", errMsg = exc.msg, conn
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self.clients[dir].add(client)
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asyncSpawn onClose()
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return conn
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proc new*(
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T: typedesc[TcpTransport],
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flags: set[ServerFlags] = {},
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upgrade: Upgrade,
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connectionsTimeout = 10.minutes): T {.public.} =
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let
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transport = T(
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flags: flags,
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clientFlags:
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if ServerFlags.TcpNoDelay in flags:
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compilesOr:
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{SocketFlags.TcpNoDelay}
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do:
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doAssert(false)
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default(set[SocketFlags])
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else:
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default(set[SocketFlags]),
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upgrader: upgrade,
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networkReachability: NetworkReachability.Unknown,
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connectionsTimeout: connectionsTimeout)
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return transport
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method start*(
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self: TcpTransport,
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addrs: seq[MultiAddress]) {.async.} =
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## listen on the transport
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##
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if self.running:
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warn "TCP transport already running"
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return
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await procCall Transport(self).start(addrs)
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trace "Starting TCP transport"
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inc getTcpTransportTracker().opened
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for i, ma in addrs:
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if not self.handles(ma):
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trace "Invalid address detected, skipping!", address = ma
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continue
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self.flags.incl(ServerFlags.ReusePort)
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let server = createStreamServer(
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ma = ma,
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flags = self.flags,
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udata = self)
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# always get the resolved address in case we're bound to 0.0.0.0:0
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self.addrs[i] = MultiAddress.init(
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server.sock.getLocalAddress()
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).tryGet()
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self.servers &= server
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trace "Listening on", address = ma
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method stop*(self: TcpTransport) {.async, gcsafe.} =
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## stop the transport
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##
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try:
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trace "Stopping TCP transport"
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checkFutures(
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await allFinished(
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self.clients[Direction.In].mapIt(it.closeWait()) &
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self.clients[Direction.Out].mapIt(it.closeWait())))
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if not self.running:
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warn "TCP transport already stopped"
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return
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await procCall Transport(self).stop() # call base
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var toWait: seq[Future[void]]
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for fut in self.acceptFuts:
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if not fut.finished:
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toWait.add(fut.cancelAndWait())
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elif fut.done:
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toWait.add(fut.read().closeWait())
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for server in self.servers:
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server.stop()
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toWait.add(server.closeWait())
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await allFutures(toWait)
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self.servers = @[]
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trace "Transport stopped"
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inc getTcpTransportTracker().closed
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except CatchableError as exc:
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trace "Error shutting down tcp transport", exc = exc.msg
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method accept*(self: TcpTransport): Future[Connection] {.async, gcsafe.} =
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## accept a new TCP connection
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##
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if not self.running:
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raise newTransportClosedError()
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try:
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if self.acceptFuts.len <= 0:
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self.acceptFuts = self.servers.mapIt(it.accept())
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if self.acceptFuts.len <= 0:
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return
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let
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finished = await one(self.acceptFuts)
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index = self.acceptFuts.find(finished)
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self.acceptFuts[index] = self.servers[index].accept()
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let transp = await finished
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let observedAddr = await getObservedAddr(transp)
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return await self.connHandler(transp, Opt.some(observedAddr), Direction.In)
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except TransportOsError as exc:
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# TODO: it doesn't sound like all OS errors
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# can be ignored, we should re-raise those
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# that can'self.
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debug "OS Error", exc = exc.msg
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except TransportTooManyError as exc:
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debug "Too many files opened", exc = exc.msg
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except TransportUseClosedError as exc:
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debug "Server was closed", exc = exc.msg
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raise newTransportClosedError(exc)
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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debug "Unexpected error accepting connection", exc = exc.msg
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raise exc
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method dial*(
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self: TcpTransport,
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hostname: string,
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address: MultiAddress,
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peerId: Opt[PeerId] = Opt.none(PeerId)): Future[Connection] {.async, gcsafe.} =
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## dial a peer
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##
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trace "Dialing remote peer", address = $address
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let transp =
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if self.networkReachability == NetworkReachability.NotReachable and self.addrs.len > 0:
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self.clientFlags.incl(SocketFlags.ReusePort)
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await connect(address, flags = self.clientFlags, localAddress = Opt.some(self.addrs[0]))
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else:
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await connect(address, flags = self.clientFlags)
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try:
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let observedAddr = await getObservedAddr(transp)
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return await self.connHandler(transp, Opt.some(observedAddr), Direction.Out)
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except CatchableError as err:
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await transp.closeWait()
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raise err
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method handles*(t: TcpTransport, address: MultiAddress): bool {.gcsafe.} =
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if procCall Transport(t).handles(address):
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if address.protocols.isOk:
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return TCP.match(address)
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