chore(PeerTable): add stringification operator (#1567)

libp2p/protocols/pubsub/peertable.nim

@@ -9,13 +9,25 @@
 
 {.push raises: [].}
 
-import std/[tables, sets, sequtils]
+import std/[tables, sets, sequtils, strutils]
 import ./pubsubpeer, ../../peerid
 
 export tables, sets
 
 type PeerTable* = Table[string, HashSet[PubSubPeer]] # topic string to peer map
 
+proc `$`*(table: PeerTable): string =
+  result.add("PeerTable ")
+  result.add("topics (" & $table.len & ")")
+
+  for topic, peers in table:
+    result.add(" topic: ")
+    result.add($topic)
+    result.add(" peers: ")
+    result.add("(" & $peers.len & ") [")
+    result.add(peers.mapIt($it).join(", "))
+    result.add("]")
+
 proc hasPeerId*(t: PeerTable, topic: string, peerId: PeerId): bool =
   if topic in t:
     try:

libp2p/protocols/pubsub/pubsubpeer.nim

@@ -172,6 +172,9 @@ proc getAgent*(peer: PubSubPeer): string =
     else:
       "unknown"
 
+proc `$`*(p: PubSubPeer): string =
+  $p.peerId
+
 func hash*(p: PubSubPeer): Hash =
   p.peerId.hash