implicitelly dial pubsub if enabled

libp2p/protocols/pubsub/pubsub.nim

@@ -125,7 +125,7 @@ method handleConn*(p: PubSub,
     return
 
   proc handler(peer: PubSubPeer, msgs: seq[RPCMsg]) {.async.} =
-    # call floodsub rpc handler
+    # call pubsub rpc handler
     await p.rpcHandler(peer, msgs)
 
   let peer = p.getPeer(conn.peerInfo, proto)

libp2p/switch.nim

@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-import tables, sequtils, options, strformat
+import tables, sequtils, options, strformat, sets
 import chronos, chronicles
 import connection,
        transports/transport,
@@ -45,6 +45,7 @@ type
       streamHandler*: StreamHandler
       secureManagers*: Table[string, Secure]
       pubSub*: Option[PubSub]
+      dialedPubSubPeers: HashSet[string]
 
 proc newNoPubSubException(): ref Exception {.inline.} =
   result = newException(NoPubSubException, "no pubsub provided!")
@@ -144,6 +145,9 @@ proc cleanupConn(s: Switch, conn: Connection) {.async, gcsafe.} =
         await s.connections[id].close()
       s.connections.del(id)
 
+    if id in s.dialedPubSubPeers:
+      s.dialedPubSubPeers.excl(id)
+
     # TODO: Investigate cleanupConn() always called twice for one peer.
     if not(conn.peerInfo.isClosed()):
       conn.peerInfo.close()
@@ -204,6 +208,8 @@ proc upgradeIncoming(s: Switch, conn: Connection) {.async, gcsafe.} =
   # handle secured connections
   await ms.handle(conn)
 
+proc subscribeToPeer(s: Switch, peerInfo: PeerInfo) {.async, gcsafe.}
+
 proc dial*(s: Switch,
            peer: PeerInfo,
            proto: string = ""):
@@ -244,6 +250,8 @@ proc dial*(s: Switch,
       error "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,
@@ -291,11 +299,16 @@ proc stop*(s: Switch) {.async.} =
   await allFutures(toSeq(s.connections.values).mapIt(s.cleanupConn(it)))
   await allFutures(s.transports.mapIt(it.close()))
 
-proc subscribeToPeer*(s: Switch, peerInfo: PeerInfo) {.async, gcsafe.} =
+proc subscribeToPeer(s: Switch, peerInfo: PeerInfo) {.async, gcsafe.} =
   ## Subscribe to pub sub peer
-  if s.pubSub.isSome:
-    let conn = await s.dial(peerInfo, s.pubSub.get().codec)
-    await s.pubSub.get().subscribeToPeer(conn)
+  if s.pubSub.isSome and peerInfo.id notin s.dialedPubSubPeers:
+    try:
+      s.dialedPubSubPeers.incl(peerInfo.id)
+      let conn = await s.dial(peerInfo, s.pubSub.get().codec)
+      await s.pubSub.get().subscribeToPeer(conn)
+    except CatchableError as exc:
+      trace "unable to initiate pubsub", exc = exc.msg
+      s.dialedPubSubPeers.excl(peerInfo.id)
 
 proc subscribe*(s: Switch, topic: string, handler: TopicHandler): Future[void] {.gcsafe.} =
   ## subscribe to a pubsub topic
@@ -351,6 +364,7 @@ proc newSwitch*(peerInfo: PeerInfo,
   result.identity = identity
   result.muxers = muxers
   result.secureManagers = initTable[string, Secure]()
+  result.dialedPubSubPeers = initHashSet[string]()
 
   let s = result # can't capture result
   result.streamHandler = proc(stream: Connection) {.async, gcsafe.} =

tests/pubsub/utils.nim

@@ -8,10 +8,10 @@ proc generateNodes*(num: Natural, gossip: bool = false): seq[Switch] =
     result.add(newStandardSwitch(gossip = gossip))
 
 proc subscribeNodes*(nodes: seq[Switch]) {.async.} =
-  var dials: seq[Future[void]]
+  var dials: seq[Future[Connection]]
   for dialer in nodes:
     for node in nodes:
       if dialer.peerInfo.peerId != node.peerInfo.peerId:
-        dials.add(dialer.subscribeToPeer(node.peerInfo))
+        dials.add(dialer.dial(node.peerInfo))
   await sleepAsync(100.millis)
   await allFutures(dials)

tests/testinterop.nim

@@ -93,8 +93,8 @@ proc createNode*(privKey: Option[PrivateKey] = none(PrivateKey),
                      secureManagers = secureManagers,
                      pubSub = pubSub)
 
-proc testPubSubDaemonPublish(gossip: bool = false, count: int = 1): Future[
-    bool] {.async.} =
+proc testPubSubDaemonPublish(gossip: bool = false,
+                             count: int = 1): Future[bool] {.async.} =
   var pubsubData = "TEST MESSAGE"
   var testTopic = "test-topic"
   var msgData = cast[seq[byte]](pubsubData)
@@ -118,8 +118,8 @@ proc testPubSubDaemonPublish(gossip: bool = false, count: int = 1): Future[
     if times >= count and not handlerFuture.finished:
       handlerFuture.complete(true)
 
-  await nativeNode.subscribeToPeer(NativePeerInfo.init(daemonPeer.peer,
-                                                       daemonPeer.addresses))
+  discard await nativeNode.dial(NativePeerInfo.init(daemonPeer.peer,
+                                                    daemonPeer.addresses))
   await sleepAsync(1.seconds)
   await daemonNode.connect(nativePeer.peerId, nativePeer.addrs)
 
@@ -140,8 +140,8 @@ proc testPubSubDaemonPublish(gossip: bool = false, count: int = 1): Future[
   await allFutures(awaiters)
   await daemonNode.close()
 
-proc testPubSubNodePublish(gossip: bool = false, count: int = 1): Future[
-    bool] {.async.} =
+proc testPubSubNodePublish(gossip: bool = false,
+                           count: int = 1): Future[bool] {.async.} =
   var pubsubData = "TEST MESSAGE"
   var testTopic = "test-topic"
   var msgData = cast[seq[byte]](pubsubData)
@@ -157,8 +157,8 @@ proc testPubSubNodePublish(gossip: bool = false, count: int = 1): Future[
   let nativePeer = nativeNode.peerInfo
 
   var handlerFuture = newFuture[bool]()
-  await nativeNode.subscribeToPeer(NativePeerInfo.init(daemonPeer.peer,
-                                                       daemonPeer.addresses))
+  discard await nativeNode.dial(NativePeerInfo.init(daemonPeer.peer,
+                                                    daemonPeer.addresses))
 
   await sleepAsync(1.seconds)
   await daemonNode.connect(nativePeer.peerId, nativePeer.addrs)