Allow passing along the handshake ENR through talkresp handler (#634)

This allows for protocols build on top of discv5 to use the ENR
provided in the handshake directly, instead of having to rely
on requesting it from the discv5 routing table.

eth/p2p/discoveryv5/encoding.nim

@@ -94,7 +94,7 @@ type
     of HandshakeMessage:
       message*: Message # In a handshake we expect to always be able to decrypt
       # TODO record or node immediately?
-      node*: Option[Node]
+      node*: Opt[Node]
       srcIdHs*: NodeId
 
   HandshakeKey* = object
@@ -484,7 +484,7 @@ proc decodeHandshakePacket(c: var Codec, fromAddr: Address, nonce: AESGCMNonce,
       return err("Invalid encoded ENR")
 
   var pubkey: PublicKey
-  var newNode: Option[Node]
+  var newNode: Opt[Node]
   # TODO: Shall we return Node or Record? Record makes more sense, but we do
   # need the pubkey and the nodeid
   if record.isSome():
@@ -496,7 +496,7 @@ proc decodeHandshakePacket(c: var Codec, fromAddr: Address, nonce: AESGCMNonce,
     # Note: Not checking if the record seqNum is higher than the one we might
     # have stored as it comes from this node directly.
     pubkey = node.pubkey
-    newNode = some(node)
+    newNode = Opt.some(node)
   else:
     # TODO: Hmm, should we still verify node id of the ENR of this node?
     if challenge.pubkey.isSome():

eth/p2p/discoveryv5/protocol.nim

@@ -157,7 +157,8 @@ type
 
   TalkProtocolHandler* = proc(
     p: TalkProtocol, request: seq[byte],
-    fromId: NodeId, fromUdpAddress: Address): seq[byte]
+    fromId: NodeId, fromUdpAddress: Address,
+    node: Opt[Node]): seq[byte]
     {.gcsafe, raises: [].}
 
   TalkProtocol* = ref object of RootObj
@@ -338,7 +339,7 @@ proc handleFindNode(d: Protocol, fromId: NodeId, fromAddr: Address,
       d.sendNodes(fromId, fromAddr, reqId, [])
 
 proc handleTalkReq(d: Protocol, fromId: NodeId, fromAddr: Address,
-    talkreq: TalkReqMessage, reqId: RequestId) =
+    talkreq: TalkReqMessage, reqId: RequestId, node: Opt[Node]) =
   let talkProtocol = d.talkProtocols.getOrDefault(talkreq.protocol)
 
   let talkresp =
@@ -348,7 +349,7 @@ proc handleTalkReq(d: Protocol, fromId: NodeId, fromAddr: Address,
       TalkRespMessage(response: @[])
     else:
       TalkRespMessage(response: talkProtocol.protocolHandler(talkProtocol,
-        talkreq.request, fromId, fromAddr))
+        talkreq.request, fromId, fromAddr, node))
   let (data, _) = encodeMessagePacket(d.rng[], d.codec, fromId, fromAddr,
     encodeMessage(talkresp, reqId))
 
@@ -356,8 +357,9 @@ proc handleTalkReq(d: Protocol, fromId: NodeId, fromAddr: Address,
     kind = MessageKind.talkresp
   d.send(fromAddr, data)
 
-proc handleMessage(d: Protocol, srcId: NodeId, fromAddr: Address,
-    message: Message) =
+proc handleMessage(
+    d: Protocol, srcId: NodeId, fromAddr: Address,
+    message: Message, node: Opt[Node] = Opt.none(Node)) =
   case message.kind
   of ping:
     discovery_message_requests_incoming.inc()
@@ -367,7 +369,7 @@ proc handleMessage(d: Protocol, srcId: NodeId, fromAddr: Address,
     d.handleFindNode(srcId, fromAddr, message.findNode, message.reqId)
   of talkReq:
     discovery_message_requests_incoming.inc()
-    d.handleTalkReq(srcId, fromAddr, message.talkReq, message.reqId)
+    d.handleTalkReq(srcId, fromAddr, message.talkReq, message.reqId, node)
   of regTopic, topicQuery:
     discovery_message_requests_incoming.inc()
     discovery_message_requests_incoming.inc(labelValues = ["no_response"])
@@ -447,7 +449,7 @@ proc receive*(d: Protocol, a: Address, packet: openArray[byte]) =
     of HandshakeMessage:
       trace "Received handshake message packet", srcId = packet.srcIdHs,
         address = a, kind = packet.message.kind
-      d.handleMessage(packet.srcIdHs, a, packet.message)
+      d.handleMessage(packet.srcIdHs, a, packet.message, packet.node)
       # For a handshake message it is possible that we received an newer ENR.
       # In that case we can add/update it to the routing table.
       if packet.node.isSome():

eth/utp/utp_discv5_protocol.nim

@@ -82,8 +82,9 @@ proc initSendCallback(
       return fut
   )
 
-proc messageHandler(protocol: TalkProtocol, request: seq[byte],
-    srcId: NodeId, srcUdpAddress: Address): seq[byte] =
+proc messageHandler(
+    protocol: TalkProtocol, request: seq[byte],
+    srcId: NodeId, srcUdpAddress: Address, node: Opt[Node]): seq[byte] =
   let
     p = UtpDiscv5Protocol(protocol)
     nodeAddress = NodeAddress.init(srcId, srcUdpAddress)

tests/p2p/test_discoveryv5.nim

@@ -792,7 +792,8 @@ suite "Discovery v5 Tests":
 
     proc handler(
         protocol: TalkProtocol, request: seq[byte],
-        fromId: NodeId, fromUdpAddress: Address):
+        fromId: NodeId, fromUdpAddress: Address,
+        node: Opt[Node]):
         seq[byte] {.gcsafe, raises: [].} =
       request
 
@@ -819,7 +820,8 @@ suite "Discovery v5 Tests":
 
     proc handler(
         protocol: TalkProtocol, request: seq[byte],
-        fromId: NodeId, fromUdpAddress: Address):
+        fromId: NodeId, fromUdpAddress: Address,
+        node: Opt[Node]):
         seq[byte] {.gcsafe, raises: [].} =
       request
 
@@ -843,7 +845,8 @@ suite "Discovery v5 Tests":
 
     proc handler(
         protocol: TalkProtocol, request: seq[byte],
-        fromId: NodeId, fromUdpAddress: Address):
+        fromId: NodeId, fromUdpAddress: Address,
+        node: Opt[Node]):
         seq[byte] {.gcsafe, raises: [].} =
       request
 
@@ -882,7 +885,8 @@ suite "Discovery v5 Tests":
 
     proc handler(
         protocol: TalkProtocol, request: seq[byte],
-        fromId: NodeId, fromUdpAddress: Address):
+        fromId: NodeId, fromUdpAddress: Address,
+        node: Opt[Node]):
         seq[byte] {.gcsafe, raises: [].} =
       # Return the request + same protocol id + 2 bytes, to make it 1 byte
       # bigger than the request