Fix JSON writer for logging in devp2p code (#597)

eth/p2p/discovery.nim

@@ -138,7 +138,7 @@ proc sendNeighbours*(d: DiscoveryProtocol, node: Node, neighbours: seq[Node]) =
     block:
       let payload = rlp.encode((nodes, expiration()))
       let msg = pack(cmdNeighbours, payload, d.privKey)
-      trace "Neighbours to", node, nodes
+      trace "Neighbours to", node, nodes = $nodes
       d.send(node, msg)
       nodes.setLen(0)
 

eth/p2p/enode.nim

@@ -12,6 +12,7 @@
 
 import
   std/[uri, strutils, net],
+  pkg/chronicles,
   ../keys
 
 export keys
@@ -133,3 +134,6 @@ proc `$`*(a: Address): string =
   result.add($a.ip)
   result.add(":" & $a.udpPort)
   result.add(":" & $a.tcpPort)
+
+chronicles.formatIt(Address): $it
+chronicles.formatIt(ENode): $it

eth/p2p/kademlia.nim

@@ -95,6 +95,9 @@ proc `$`*(n: Node): string =
   else:
     "Node[" & $n.node.address.ip & ":" & $n.node.address.udpPort & "]"
 
+chronicles.formatIt(Node): $it
+chronicles.formatIt(seq[Node]): $it
+
 proc hash*(n: Node): hashes.Hash = hash(n.node.pubkey.toRaw)
 proc `==`*(a, b: Node): bool = (a.isNil and b.isNil) or
   (not a.isNil and not b.isNil and a.node.pubkey == b.node.pubkey)