no empty proto dials and add connect method

libp2p/switch.nim

@@ -209,10 +209,8 @@ proc upgradeIncoming(s: Switch, conn: Connection) {.async, gcsafe.} =
 
 proc subscribeToPeer(s: Switch, peerInfo: PeerInfo) {.async, gcsafe.}
 
-proc dial*(s: Switch,
-           peer: PeerInfo,
-           proto: string = ""):
-           Future[Connection] {.async.} =
+proc internalConnect(s: Switch,
+                     peer: PeerInfo): Future[Connection] {.async.} =
   let id = peer.id
   trace "Dialing peer", peer = id
   var conn = s.connections.getOrDefault(id)
@@ -239,10 +237,25 @@ proc dial*(s: Switch,
   else:
     trace "Reusing existing connection"
 
+  await s.subscribeToPeer(peer)
+  result = conn
+
+proc connect*(s: Switch, peer: PeerInfo) {.async.} =
+  var conn = s.internalConnect(peer)
+  if isNil(conn):
+    raise newException(CatchableError, "Unable to connect to peer")
+
+proc dial*(s: Switch,
+           peer: PeerInfo,
+           proto: string):
+           Future[Connection] {.async.} =
+  var conn = await s.internalConnect(peer)
   if isNil(conn):
     raise newException(CatchableError, "Unable to establish outgoing link")
 
-  if proto.len > 0 and not conn.closed:
+  if conn.closed:
+    raise newException(CatchableError, "Connection dead on arrival")
+
   let stream = await s.getMuxedStream(peer)
   if not isNil(stream):
     trace "Connection is muxed, return muxed stream"
@@ -250,11 +263,9 @@ proc dial*(s: Switch,
     trace "Attempting to select remote", proto = proto
 
   if not await s.ms.select(result, proto):
-      error "Unable to select sub-protocol", proto = proto
+    warn "Unable to select sub-protocol", proto = proto
     raise newException(CatchableError, &"unable to select protocol: {proto}")
 
-  await s.subscribeToPeer(peer)
-
 proc mount*[T: LPProtocol](s: Switch, proto: T) {.gcsafe.} =
   if isNil(proto.handler):
     raise newException(CatchableError,
@@ -310,7 +321,7 @@ proc subscribeToPeer(s: Switch, peerInfo: PeerInfo) {.async, gcsafe.} =
       let conn = await s.dial(peerInfo, s.pubSub.get().codec)
       await s.pubSub.get().subscribeToPeer(conn)
     except CatchableError as exc:
-      warn "unable to initiate pubsub", exc = exc.msg
+      trace "unable to initiate pubsub", exc = exc.msg
       s.dialedPubSubPeers.excl(peerInfo.id)
 
 proc subscribe*(s: Switch, topic: string, handler: TopicHandler): Future[void] {.gcsafe.} =

tests/pubsub/utils.nim

@@ -1,4 +1,3 @@
-import options, tables
 import chronos
 import ../../libp2p/standard_setup
 export standard_setup
@@ -8,10 +7,10 @@ proc generateNodes*(num: Natural, gossip: bool = false): seq[Switch] =
     result.add(newStandardSwitch(gossip = gossip))
 
 proc subscribeNodes*(nodes: seq[Switch]) {.async.} =
-  var dials: seq[Future[Connection]]
+  var dials: seq[Future[void]]
   for dialer in nodes:
     for node in nodes:
       if dialer.peerInfo.peerId != node.peerInfo.peerId:
-        dials.add(dialer.dial(node.peerInfo))
+        dials.add(dialer.connect(node.peerInfo))
   await sleepAsync(100.millis)
   await allFutures(dials)

tests/testinterop.nim

@@ -118,7 +118,7 @@ proc testPubSubDaemonPublish(gossip: bool = false,
     if times >= count and not handlerFuture.finished:
       handlerFuture.complete(true)
 
-  discard await nativeNode.dial(NativePeerInfo.init(daemonPeer.peer,
+  await nativeNode.connect(NativePeerInfo.init(daemonPeer.peer,
                                                daemonPeer.addresses))
   await sleepAsync(1.seconds)
   await daemonNode.connect(nativePeer.peerId, nativePeer.addrs)
@@ -157,7 +157,7 @@ proc testPubSubNodePublish(gossip: bool = false,
   let nativePeer = nativeNode.peerInfo
 
   var handlerFuture = newFuture[bool]()
-  discard await nativeNode.dial(NativePeerInfo.init(daemonPeer.peer,
+  await nativeNode.connect(NativePeerInfo.init(daemonPeer.peer,
                                                daemonPeer.addresses))
 
   await sleepAsync(1.seconds)

tests/testswitch.nim

@@ -91,16 +91,24 @@ suite "Switch":
 
       var peerInfo1, peerInfo2: PeerInfo
       var switch1, switch2: Switch
-      (switch1, peerInfo1) = createSwitch(ma1)
       var awaiters: seq[Future[void]]
-      awaiters.add(await switch1.start())
 
+      (switch1, peerInfo1) = createSwitch(ma1)
+
+      let testProto = new TestProto
+      testProto.init()
+      testProto.codec = TestCodec
+      switch1.mount(testProto)
       (switch2, peerInfo2) = createSwitch(ma2)
+      awaiters.add(await switch1.start())
       awaiters.add(await switch2.start())
-      var conn = await switch2.dial(switch1.peerInfo)
+      await switch2.connect(switch1.peerInfo)
+      let conn = await switch2.dial(switch1.peerInfo, TestCodec)
+      await conn.writeLp("Hello!")
+      let msg = cast[string](await conn.readLp())
+      check "Hello!" == msg
 
-      check isNil(conn)
-      discard allFutures(switch1.stop(), switch2.stop())
+      await allFutures(switch1.stop(), switch2.stop())
       await allFutures(awaiters)
       result = true