Add getNode and tests for findNode and getNode

eth/p2p/discoveryv5/enr.nim

@@ -101,15 +101,19 @@ macro initRecord*(seqNum: uint64, pk: PrivateKey, pairs: untyped{nkTableConstr})
 
 proc init*(T: type Record, seqNum: uint64,
                            pk: PrivateKey,
-                           address: enode.Address): T =
-  let
-    isV6 = address.ip.family == IPv6
-    ipField = if isV6: ("ip6", address.ip.address_v6.toField)
-              else: ("ip", address.ip.address_v4.toField)
-    tcpField = ((if isV6: "tcp6" else: "tcp"), address.tcpPort.uint16.toField)
-    udpField = ((if isV6: "udp6" else: "udp"), address.udpPort.uint16.toField)
+                           address: Option[enode.Address]): T =
+  if address.isSome():
+    let
+      a = address.get()
+      isV6 = a.ip.family == IPv6
+      ipField = if isV6: ("ip6", a.ip.address_v6.toField)
+                else: ("ip", a.ip.address_v4.toField)
+      tcpField = ((if isV6: "tcp6" else: "tcp"), a.tcpPort.uint16.toField)
+      udpField = ((if isV6: "udp6" else: "udp"), a.udpPort.uint16.toField)
 
-  makeEnrAux(seqNum, pk, [ipField, tcpField, udpField])
+    makeEnrAux(seqNum, pk, [ipField, tcpField, udpField])
+  else:
+    makeEnrAux(seqNum, pk, [])
 
 proc getField(r: Record, name: string, field: var Field): bool =
   # It might be more correct to do binary search,

eth/p2p/discoveryv5/node.nim

@@ -28,19 +28,23 @@ proc newNode*(pk: PublicKey, address: Address): Node =
 
 proc newNode*(r: Record): Node =
   # TODO: Handle IPv6
-  let
-    ipBytes = r.get("ip", array[4, byte])
-    udpPort = r.get("udp", uint16)
+  var a: Address
+  try:
+    let
+      ipBytes = r.get("ip", array[4, byte])
+      udpPort = r.get("udp", uint16)
+
+    a = Address(ip: IpAddress(family: IpAddressFamily.IPv4,
+                              address_v4: ipBytes),
+                udpPort: Port udpPort)
+  except KeyError:
+    discard
 
   var pk: PublicKey
   if recoverPublicKey(r.get("secp256k1", seq[byte]), pk) != EthKeysStatus.Success:
     warn "Could not recover public key"
     return
 
-  let a = Address(ip: IpAddress(family: IpAddressFamily.IPv4,
-                                address_v4: ipBytes),
-                  udpPort: Port udpPort)
-
   result = newNode(initENode(pk, a))
   result.record = r
 

eth/p2p/discoveryv5/protocol.nim

@@ -59,10 +59,16 @@ proc addNode*(d: Protocol, enr: EnrUri) =
   doAssert(res)
   d.addNode newNode(r)
 
-proc randomNodes*(k: Protocol, count: int): seq[Node] =
-  k.routingTable.randomNodes(count)
+proc getNode*(d: Protocol, id: NodeId): Node =
+  d.routingTable.getNode(id)
 
-proc nodesDiscovered*(k: Protocol): int {.inline.} = k.routingTable.len
+proc randomNodes*(d: Protocol, count: int): seq[Node] =
+  d.routingTable.randomNodes(count)
+
+proc neighbours*(d: Protocol, id: NodeId, k: int = BUCKET_SIZE): seq[Node] =
+  d.routingTable.neighbours(id, k)
+
+proc nodesDiscovered*(d: Protocol): int {.inline.} = d.routingTable.len
 
 proc whoareyouMagic(toNode: NodeId): array[magicSize, byte] =
   const prefix = "WHOAREYOU"
@@ -77,7 +83,7 @@ proc newProtocol*(privKey: PrivateKey, db: Database,
   let
     a = Address(ip: ip, tcpPort: tcpPort, udpPort: udpPort)
     enode = initENode(privKey.getPublicKey(), a)
-    enrRec = enr.Record.init(12, privKey, a)
+    enrRec = enr.Record.init(12, privKey, some(a))
     node = newNode(enode, enrRec)
 
   result = Protocol(
@@ -281,7 +287,7 @@ proc waitNodes(d: Protocol, fromNode: Node, reqId: RequestId): Future[seq[Node]]
       else:
         break
 
-proc findNode(d: Protocol, toNode: Node, distance: uint32): Future[seq[Node]] {.async.} =
+proc findNode*(d: Protocol, toNode: Node, distance: uint32): Future[seq[Node]] {.async.} =
   let reqId = newRequestId()
   let packet = encodePacket(FindNodePacket(distance: distance), reqId)
   let (data, nonce) = d.codec.encodeEncrypted(toNode.id, toNode.address, packet,

tests/p2p/test_discoveryv5.nim

@@ -1,5 +1,5 @@
 import
-  random, unittest, chronos, sequtils, chronicles, tables, stint,
+  random, unittest, chronos, sequtils, chronicles, tables, stint, options,
   eth/[keys, rlp], eth/p2p/enode, eth/trie/db,
   eth/p2p/discoveryv5/[discovery_db, enr, node, types, routing_table, encoding],
   eth/p2p/discoveryv5/protocol as discv5_protocol,
@@ -32,6 +32,10 @@ proc randomPacket(tag: PacketTag): seq[byte] =
   result.add(rlp.encode(authTag))
   result.add(msg)
 
+proc generateNode(privKey = newPrivateKey()): Node =
+  let enr = enr.Record.init(1, privKey, none(Address))
+  result = newNode(enr)
+
 suite "Discovery v5 Tests":
   asyncTest "Random nodes":
     let
@@ -88,6 +92,47 @@ suite "Discovery v5 Tests":
     for node in nodes:
       await node.closeWait()
 
+  asyncTest "FindNode with test table":
+
+    let mainNode = initDiscoveryNode(newPrivateKey(), localAddress(20301), @[])
+
+    # Generate 1000 random nodes and add to our main node's routing table
+    for i in 0..<1000:
+      mainNode.addNode(generateNode())
+
+    let
+      neighbours = mainNode.neighbours(mainNode.localNode.id)
+      closest = neighbours[0]
+      closestDistance = logDist(closest.id, mainNode.localNode.id)
+
+    debug "Closest neighbour", closestDistance, id=closest.id.toHex()
+
+    let
+      testNode = initDiscoveryNode(newPrivateKey(), localAddress(20302),
+        @[mainNode.localNode.record])
+      discovered = await discv5_protocol.findNode(testNode, mainNode.localNode,
+        closestDistance)
+
+    check closest in discovered
+
+    await mainNode.closeWait()
+    await testNode.closeWait()
+
+  asyncTest "GetNode":
+    # TODO: This could be tested in just a routing table only context
+    let
+      node = initDiscoveryNode(newPrivateKey(), localAddress(20302), @[])
+      targetNode = generateNode()
+
+    node.addNode(targetNode)
+
+    for i in 0..<1000:
+      node.addNode(generateNode())
+
+    check node.getNode(targetNode.id) == targetNode
+
+    await node.closeWait()
+
   asyncTest "Handshake cleanup":
     let node = initDiscoveryNode(newPrivateKey(), localAddress(20302), @[])
     var tag: PacketTag

tests/p2p/test_enr.nim

@@ -35,19 +35,35 @@ suite "ENR":
       keys = newKeyPair()
       ip = parseIpAddress("10.20.30.40")
       enodeAddress = Address(ip: ip, tcpPort: Port 9000, udpPort: Port 9000)
-      enr = Record.init(100, keys.seckey, enodeAddress)
-      typedEnr = get enr.toTypedRecord
+      enr = Record.init(100, keys.seckey, some(enodeAddress))
+      typedEnr = get enr.toTypedRecord()
 
     check:
-      typedEnr.secp256k1.isSome
-      typedEnr.secp256k1.get == keys.pubkey.getRawCompressed
+      typedEnr.secp256k1.isSome()
+      typedEnr.secp256k1.get == keys.pubkey.getRawCompressed()
 
-      typedEnr.ip.isSome
-      typedEnr.ip.get == [byte 10, 20, 30, 40]
+      typedEnr.ip.isSome()
+      typedEnr.ip.get() == [byte 10, 20, 30, 40]
 
-      typedEnr.tcp.isSome
-      typedEnr.tcp.get == 9000
+      typedEnr.tcp.isSome()
+      typedEnr.tcp.get() == 9000
 
-      typedEnr.udp.isSome
-      typedEnr.udp.get == 9000
+      typedEnr.udp.isSome()
+      typedEnr.udp.get() == 9000
 
+  test "ENR without address":
+    let
+      keys = newKeyPair()
+      enr = Record.init(100, keys.seckey, none(Address))
+      typedEnr = get enr.toTypedRecord()
+
+    check:
+      typedEnr.secp256k1.isSome()
+      typedEnr.secp256k1.get() == keys.pubkey.getRawCompressed()
+
+      typedEnr.ip.isNone()
+      typedEnr.tcp.isNone()
+      typedEnr.udp.isNone()
+      typedEnr.ip6.isNone()
+      typedEnr.tcp6.isNone()
+      typedEnr.udp6.isNone()