relay: add trace logs in case of msg validation rejection (#2285)

waku/waku_relay/protocol.nim

@@ -202,6 +202,7 @@ proc generateOrderedValidator*(w: WakuRelay): auto {.gcsafe.} =
     # see nim-libp2p protobuf library
     let msgRes = WakuMessage.decode(message.data)
     if msgRes.isErr():
+      trace "protocol generateOrderedValidator reject decode error", error=msgRes.error
       return ValidationResult.Reject
     let msg = msgRes.get()
 

waku/waku_rln_relay/rln_relay.nim

@@ -322,6 +322,7 @@ proc generateRlnValidator*(wakuRlnRelay: WakuRLNRelay,
     let decodeRes = RateLimitProof.init(message.proof)
 
     if decodeRes.isErr():
+      trace "generateRlnValidator reject", error=decodeRes.error
       return pubsub.ValidationResult.Reject
 
     let msgProof = decodeRes.get()