Dialing addrs concurrently in autonat (#855)

libp2p/protocols/connectivity/autonat/client.nim

@@ -62,12 +62,13 @@ method dialMe*(self: AutonatClient, switch: Switch, pid: PeerId, addrs: seq[Mult
   defer:
     await conn.close()
     incomingConnection.cancel() # Safer to always try to cancel cause we aren't sure if the peer dialled us or not
+  trace "sending Dial", addrs = switch.peerInfo.addrs
   await conn.sendDial(switch.peerInfo.peerId, switch.peerInfo.addrs)
   let response = getResponseOrRaise(AutonatMsg.decode(await conn.readLp(1024)))
   return case response.status:
     of ResponseStatus.Ok:
       response.ma.get()
     of ResponseStatus.DialError:
-      raise newException(AutonatUnreachableError, "Peer could not dial us back")
+      raise newException(AutonatUnreachableError, "Peer could not dial us back: " & response.text.get(""))
     else:
       raise newException(AutonatError, "Bad status " & $response.status & " " & response.text.get(""))

libp2p/protocols/connectivity/autonat/server.nim

@@ -20,7 +20,7 @@ import ../../protocol,
        ../../../multiaddress,
        ../../../multicodec,
        ../../../peerid,
-       ../../../utils/semaphore,
+       ../../../utils/[semaphore, future],
        ../../../errors
 import core
 
@@ -60,23 +60,36 @@ proc sendResponseOk(conn: Connection, ma: MultiAddress) {.async.} =
 
 proc tryDial(autonat: Autonat, conn: Connection, addrs: seq[MultiAddress]) {.async.} =
   await autonat.sem.acquire()
+  var futs: seq[Future[Opt[MultiAddress]]]
   try:
     # This is to bypass the per peer max connections limit
     let outgoingConnection = autonat.switch.connManager.expectConnection(conn.peerId)
     # Safer to always try to cancel cause we aren't sure if the connection was established
     defer: outgoingConnection.cancel()
-    # This is to bypass the global max connections limit
-    let ma = await autonat.switch.dialer.tryDial(conn.peerId, addrs).wait(autonat.dialTimeout)
+    # tryDial is to bypass the global max connections limit
+    futs = addrs.mapIt(autonat.switch.dialer.tryDial(conn.peerId, @[it]))
+    let fut = await anyCompleted(futs).wait(autonat.dialTimeout)
+    let ma = await fut
     if ma.isSome:
       await conn.sendResponseOk(ma.get())
     else:
       await conn.sendResponseError(DialError, "Missing observed address")
   except CancelledError as exc:
     raise exc
+  except AllFuturesFailedError as exc:
+    debug "All dial attempts failed", addrs, exc = exc.msg
+    await conn.sendResponseError(DialError, "All dial attempts failed")
+  except AsyncTimeoutError as exc:
+    debug "Dial timeout", addrs, exc = exc.msg
+    await conn.sendResponseError(DialError, "Dial timeout")
   except CatchableError as exc:
-    await conn.sendResponseError(DialError, exc.msg)
+    debug "Unexpected error", addrs, exc = exc.msg
+    await conn.sendResponseError(DialError, "Unexpected error")
   finally:
     autonat.sem.release()
+    for f in futs:
+      if not f.finished():
+        f.cancel()
 
 proc handleDial(autonat: Autonat, conn: Connection, msg: AutonatMsg): Future[void] =
   if msg.dial.isNone() or msg.dial.get().peerInfo.isNone():
@@ -98,6 +111,7 @@ proc handleDial(autonat: Autonat, conn: Connection, msg: AutonatMsg): Future[voi
     return conn.sendResponseError(InternalError, "Expected an IP address")
   var addrs = initHashSet[MultiAddress]()
   addrs.incl(observedAddr)
+  trace "addrs received", addrs = peerInfo.addrs
   for ma in peerInfo.addrs:
     isRelayed = ma.contains(multiCodec("p2p-circuit"))
     if isRelayed.isErr() or isRelayed.get():
@@ -122,7 +136,9 @@ proc handleDial(autonat: Autonat, conn: Connection, msg: AutonatMsg): Future[voi
 
   if len(addrs) == 0:
     return conn.sendResponseError(DialRefused, "No dialable address")
-  return autonat.tryDial(conn, toSeq(addrs))
+  let addrsSeq = toSeq(addrs)
+  trace "trying to dial", addrs = addrsSeq
+  return autonat.tryDial(conn, addrsSeq)
 
 proc new*(T: typedesc[Autonat], switch: Switch, semSize: int = 1, dialTimeout = 15.seconds): T =
   let autonat = T(switch: switch, sem: newAsyncSemaphore(semSize), dialTimeout: dialTimeout)
@@ -136,7 +152,7 @@ proc new*(T: typedesc[Autonat], switch: Switch, semSize: int = 1, dialTimeout =
     except CancelledError as exc:
       raise exc
     except CatchableError as exc:
-      trace "exception in autonat handler", exc = exc.msg, conn
+      debug "exception in autonat handler", exc = exc.msg, conn
     finally:
       trace "exiting autonat handler", conn
       await conn.close()

libp2p/protocols/connectivity/autonat/service.nim

@@ -99,28 +99,29 @@ proc handleAnswer(self: AutonatService, ans: NetworkReachability) {.async.} =
       self.networkReachability = reachability
       self.confidence = some(confidence)
 
-  trace "Current status", currentStats = $self.networkReachability, confidence = $self.confidence
+  debug "Current status", currentStats = $self.networkReachability, confidence = $self.confidence, answers = self.answers
 
 proc askPeer(self: AutonatService, switch: Switch, peerId: PeerId): Future[NetworkReachability] {.async.} =
   logScope:
     peerId = $peerId
   if not hasEnoughIncomingSlots(switch):
-    trace "No incoming slots available, not asking peer", incomingSlotsAvailable=switch.connManager.slotsAvailable(In)
+    debug "No incoming slots available, not asking peer", incomingSlotsAvailable=switch.connManager.slotsAvailable(In)
     return Unknown
 
-  trace "Asking for reachability"
+  trace "Asking peer for reachability"
   let ans =
     try:
       discard await self.autonatClient.dialMe(switch, peerId).wait(self.dialTimeout)
+      debug "dialMe answer is reachable"
       Reachable
-    except AutonatUnreachableError:
-      trace "dialMe answer is not reachable"
+    except AutonatUnreachableError as error:
+      debug "dialMe answer is not reachable", msg = error.msg
       NotReachable
-    except AsyncTimeoutError:
-      trace "dialMe timed out"
+    except AsyncTimeoutError as error:
+      debug "dialMe timed out", msg = error.msg
       Unknown
-    except CatchableError as err:
-      trace "dialMe unexpected error", errMsg = $err.msg
+    except CatchableError as error:
+      debug "dialMe unexpected error", msg = error.msg
       Unknown
   await self.handleAnswer(ans)
   if not isNil(self.statusAndConfidenceHandler):
@@ -128,6 +129,7 @@ proc askPeer(self: AutonatService, switch: Switch, peerId: PeerId): Future[Netwo
   return ans
 
 proc askConnectedPeers(self: AutonatService, switch: Switch) {.async.} =
+  trace "Asking peers for reachability"
   var peers = switch.connectedPeers(Direction.Out)
   self.rng.shuffle(peers)
   var answersFromPeers = 0
@@ -141,10 +143,11 @@ proc askConnectedPeers(self: AutonatService, switch: Switch) {.async.} =
       answersFromPeers.inc()
 
 proc schedule(service: AutonatService, switch: Switch, interval: Duration) {.async.} =
-  heartbeat "Schedule AutonatService run", interval:
+  heartbeat "Scheduling AutonatService run", interval:
     await service.run(switch)
 
 method setup*(self: AutonatService, switch: Switch): Future[bool] {.async.} =
+  info "Setting up AutonatService"
   let hasBeenSetup = await procCall Service(self).setup(switch)
   if hasBeenSetup:
     if self.askNewConnectedPeers:
@@ -157,11 +160,13 @@ method setup*(self: AutonatService, switch: Switch): Future[bool] {.async.} =
   return hasBeenSetup
 
 method run*(self: AutonatService, switch: Switch) {.async, public.} =
+  trace "Running AutonatService"
   await askConnectedPeers(self, switch)
   await self.callHandler()
 
 
 method stop*(self: AutonatService, switch: Switch): Future[bool] {.async, public.} =
+  info "Stopping AutonatService"
   let hasBeenStopped = await procCall Service(self).stop(switch)
   if hasBeenStopped:
     if not isNil(self.scheduleHandle):

tests/testautonat.nim

@@ -85,6 +85,6 @@ suite "Autonat":
     let response = AutonatMsg.decode(await conn.readLp(1024)).get().response.get()
     check:
       response.status == DialError
-      response.text.get() == "Timeout exceeded!"
+      response.text.get() == "Dial timeout"
       response.ma.isNone()
     await allFutures(doesNothingListener.stop(), src.stop(), dst.stop())