/// <summary>
/// Deserializes a <see cref="NodeRecord"/> from an <see cref="RlpStream"/>.
/// </summary>
/// <param name="rlpStream">A stream to read the serialized data from.</param>
/// <returns>A deserialized <see cref="NodeRecord"/></returns>
public NodeRecord Deserialize(RlpStream rlpStream)
{
int startPosition = rlpStream.Position;
int recordRlpLength = rlpStream.ReadSequenceLength();
NodeRecord nodeRecord = new();
ReadOnlySpan <byte> sigBytes = rlpStream.DecodeByteArraySpan();
Signature signature = new(sigBytes, 0);
bool canVerify = true;
long enrSequence = rlpStream.DecodeLong();
while (rlpStream.Position < startPosition + recordRlpLength)
{
string key = rlpStream.DecodeString();
switch (key)
{
case EnrContentKey.Eth:
_ = rlpStream.ReadSequenceLength();
_ = rlpStream.ReadSequenceLength();
byte[] forkHash = rlpStream.DecodeByteArray();
long nextBlock = rlpStream.DecodeLong();
nodeRecord.SetEntry(new EthEntry(forkHash, nextBlock));
break;
case EnrContentKey.Id:
rlpStream.SkipItem();
nodeRecord.SetEntry(IdEntry.Instance);
break;
case EnrContentKey.Ip:
ReadOnlySpan <byte> ipBytes = rlpStream.DecodeByteArraySpan();
IPAddress address = new(ipBytes);
nodeRecord.SetEntry(new IpEntry(address));
break;
case EnrContentKey.Tcp:
int tcpPort = rlpStream.DecodeInt();
nodeRecord.SetEntry(new TcpEntry(tcpPort));
break;
case EnrContentKey.Udp:
int udpPort = rlpStream.DecodeInt();
nodeRecord.SetEntry(new UdpEntry(udpPort));
break;
case EnrContentKey.Secp256K1:
ReadOnlySpan <byte> keyBytes = rlpStream.DecodeByteArraySpan();
CompressedPublicKey reportedKey = new(keyBytes);
nodeRecord.SetEntry(new Secp256K1Entry(reportedKey));
break;
// snap
default:
canVerify = false;
rlpStream.SkipItem();
nodeRecord.Snap = true;
break;
}
}
if (!canVerify)
{
rlpStream.Position = startPosition;
rlpStream.ReadSequenceLength();
rlpStream.SkipItem(); // signature
int noSigContentLength = rlpStream.Length - rlpStream.Position;
int noSigSequenceLength = Rlp.LengthOfSequence(noSigContentLength);
byte[] originalContent = new byte[noSigSequenceLength];
RlpStream originalContentStream = new (originalContent);
originalContentStream.StartSequence(noSigContentLength);
originalContentStream.Write(rlpStream.Read(noSigContentLength));
rlpStream.Position = startPosition;
nodeRecord.OriginalContentRlp = originalContentStream.Data !;
}
nodeRecord.EnrSequence = enrSequence;
nodeRecord.Signature = signature;
return(nodeRecord);
}
