Fix subclass calls to handleDisconnect (#314)

* Fix subclass calls to handleDisconnect

* add peer ID to nil peer debug message

libp2p/protocols/pubsub/floodsub.nim

@@ -36,7 +36,7 @@ method subscribeTopic*(f: FloodSub,
 
   let peer = f.peers.getOrDefault(peerId)
   if peer == nil:
-    debug "subscribeTopic on a nil peer!"
+    debug "subscribeTopic on a nil peer!", peer = peerId
     return
 
   if topic notin f.floodsub:
@@ -53,12 +53,15 @@ method subscribeTopic*(f: FloodSub,
 
 method handleDisconnect*(f: FloodSub, peer: PubSubPeer) =
   ## handle peer disconnects
+  ##
+  
+  procCall PubSub(f).handleDisconnect(peer)
+
+  if not(isNil(peer)) and peer.peerInfo notin f.conns:
     for t in toSeq(f.floodsub.keys):
       if t in f.floodsub:
         f.floodsub[t].excl(peer)
 
-  procCall PubSub(f).handleDisconnect(peer)
-
 method rpcHandler*(f: FloodSub,
                    peer: PubSubPeer,
                    rpcMsgs: seq[RPCMsg]) {.async.} =

libp2p/protocols/pubsub/gossipsub.nim

@@ -245,7 +245,11 @@ proc heartbeat(g: GossipSub) {.async.} =
 
 method handleDisconnect*(g: GossipSub, peer: PubSubPeer) =
   ## handle peer disconnects
+  ## 
+  
   procCall FloodSub(g).handleDisconnect(peer)
+
+  if not(isNil(peer)) and peer.peerInfo notin g.conns:
     for t in toSeq(g.gossipsub.keys):
       g.gossipsub.removePeer(t, peer)
 
@@ -284,7 +288,7 @@ method subscribeTopic*(g: GossipSub,
 
   let peer = g.peers.getOrDefault(peerId)
   if peer == nil:
-    debug "subscribeTopic on a nil peer!"
+    # floodsub method logs a debug line already
     return
 
   if subscribe:

libp2p/protocols/pubsub/pubsub.nim

@@ -63,6 +63,7 @@ type
 method handleDisconnect*(p: PubSub, peer: PubSubPeer) {.base.} =
   ## handle peer disconnects
   ##
+  
   if not(isNil(peer)) and peer.peerInfo notin p.conns:
     trace "deleting peer", peer = peer.id
     peer.onConnect.fire() # Make sure all pending sends are unblocked