Fail only if all addresses in PeerRecord are invalid (#898)

Fixes https://github.com/waku-org/nwaku/issues/1768

libp2p/routing_record.nim

@@ -51,11 +51,13 @@ proc decode*(
     for address in addressInfos:
       var addressInfo = AddressInfo()
       let subProto = initProtoBuffer(address)
-      if ? subProto.getField(1, addressInfo.address) == false:
+      let f = subProto.getField(1, addressInfo.address)
-        return err(ProtoError.RequiredFieldMissing)
+      if f.isOk() and f.get():
-
           record.addresses &= addressInfo
 
+    if record.addresses.len == 0:
+      return err(ProtoError.RequiredFieldMissing)
+
   ok(record)
 
 proc encode*(record: PeerRecord): seq[byte] =

tests/testrouting_record.nim

@@ -77,3 +77,41 @@ suite "Signed Routing Record":
       buffer = routingRecord.envelope.encode().tryGet()
 
     check SignedPeerRecord.decode(buffer).error == EnvelopeInvalidSignature
+
+  test "Decode doesn't fail if some addresses are invalid":
+    let
+      rng = newRng()
+      privKey = PrivateKey.random(rng[]).tryGet()
+      peerId = PeerId.init(privKey).tryGet()
+      multiAddresses = @[MultiAddress(), MultiAddress.init("/ip4/0.0.0.0/tcp/25").tryGet()]
+      routingRecord = PeerRecord.init(peerId, multiAddresses, 42)
+
+      buffer = routingRecord.encode()
+      parsedRR = PeerRecord.decode(buffer).tryGet()
+
+    check parsedRR.addresses.len == 1
+
+  test "Decode doesn't fail if there are no addresses":
+    let
+      rng = newRng()
+      privKey = PrivateKey.random(rng[]).tryGet()
+      peerId = PeerId.init(privKey).tryGet()
+      multiAddresses = newSeq[MultiAddress]()
+      routingRecord = PeerRecord.init(peerId, multiAddresses, 42)
+
+      buffer = routingRecord.encode()
+      parsedRR = PeerRecord.decode(buffer).tryGet()
+
+    check parsedRR.addresses.len == 0
+
+  test "Decode fails if all addresses are invalid":
+    let
+      rng = newRng()
+      privKey = PrivateKey.random(rng[]).tryGet()
+      peerId = PeerId.init(privKey).tryGet()
+      multiAddresses = @[MultiAddress(), MultiAddress()]
+      routingRecord = PeerRecord.init(peerId, multiAddresses, 42)
+
+      buffer = routingRecord.encode()
+
+    check PeerRecord.decode(buffer).isErr