fix: compilation issue when `libp2p_expensive_metrics` is enabled. (#1014)

libp2p/protocols/pubsub/gossipsub.nim

@@ -426,6 +426,11 @@ method rpcHandler*(g: GossipSub,
     await rateLimit(g, peer, Opt.none(RPCMsg), msgSize)
     return
 
+  when defined(libp2p_expensive_metrics):
+    for m in rpcMsg.messages:
+      for t in m.topicIDs:
+        libp2p_pubsub_received_messages.inc(labelValues = [$peer.peerId, t])
+
   trace "decoded msg from peer", peer, msg = rpcMsg.shortLog
   await rateLimit(g, peer, Opt.some(rpcMsg), msgSize)
 

libp2p/protocols/pubsub/pubsubpeer.nim

@@ -138,12 +138,6 @@ proc handle*(p: PubSubPeer, conn: Connection) {.async.} =
           conn, peer = p, closed = conn.closed,
           data = data.shortLog
 
-        when defined(libp2p_expensive_metrics):
-          for m in rmsg.messages:
-            for t in m.topicIDs:
-              # metrics
-              libp2p_pubsub_received_messages.inc(labelValues = [$p.peerId, t])
-
         await p.handler(p, data)
         data = newSeq[byte]() # Release memory
     except PeerRateLimitError as exc: