public async Task SendMessageAsync(Message message)
{
try
{
await semaphore.DoAsync(async () =>
{
using (var stream = new NetworkStream(this.socket))
{
var stopwatch = new Stopwatch();
stopwatch.Start();
var byteStream = new MemoryStream();
NetworkEncoder.EncodeMessage(byteStream, message);
var messageBytes = byteStream.ToArray();
await stream.WriteAsync(messageBytes, 0, messageBytes.Length);
stopwatch.Stop();
//Debug.WriteLine("-------------------------");
//Debug.WriteLine(string.Format("Sent {0} in {1} ms\nPayload: {2}", message.Command, stopwatch.ElapsedMilliseconds, message.Payload.ToHexDataString()));
}
});
}
catch (Exception e)
{
Fail(e);
}
}
public static Message ConstructMessage(string command, byte[] payload)
{
var message = new Message
(
Magic: Messaging.Magic,
Command: command,
PayloadSize: (UInt32)payload.Length,
PayloadChecksum: CalculatePayloadChecksum(payload),
Payload: payload.ToImmutableArray()
);
return message;
}
public static void EncodeMessage(Stream stream, Message message)
{
using (var writer = new BinaryWriter(stream, Encoding.ASCII, leaveOpen: true))
{
writer.Write4Bytes(message.Magic);
writer.WriteFixedString(12, message.Command);
writer.Write4Bytes(message.PayloadSize);
writer.Write4Bytes(message.PayloadChecksum);
writer.WriteBytes(message.PayloadSize.ToIntChecked(), message.Payload.ToArray());
}
}
public static byte[] EncodeMessage(Message message)
{
var stream = new MemoryStream();
EncodeMessage(stream, message);
return stream.ToArray();
}
private Message WireDecodeMessage(UInt32 magic, Stream stream)
{
byte[] payload;
Message message;
using (var reader = new BinaryReader(stream, Encoding.ASCII, leaveOpen: true))
{
var command = reader.ReadFixedString(12);
var payloadSize = reader.Read4Bytes();
var payloadChecksum = reader.Read4Bytes();
payload = reader.ReadBytes(payloadSize.ToIntChecked());
if (!Messaging.VerifyPayloadChecksum(payloadChecksum, payload))
throw new Exception(string.Format("Checksum failed for {0}", command));
message = new Message
(
Magic: magic,
Command: command,
PayloadSize: payloadSize,
PayloadChecksum: payloadChecksum,
Payload: payload.ToImmutableArray()
);
}
switch (message.Command)
{
case "addr":
{
var addressPayload = NetworkEncoder.DecodeAddressPayload(payload.ToMemoryStream());
var handler = this.OnReceivedAddresses;
if (handler != null)
handler(addressPayload.NetworkAddresses);
}
break;
case "alert":
{
var alertPayload = NetworkEncoder.DecodeAlertPayload(payload.ToMemoryStream());
}
break;
case "block":
{
var block = NetworkEncoder.DecodeBlock(payload.ToMemoryStream());
var handler = this.OnBlock;
if (handler != null)
handler(block);
}
break;
case "getblocks":
{
var getBlocksPayload = NetworkEncoder.DecodeGetBlocksPayload(payload.ToMemoryStream());
var handler = this.OnGetBlocks;
if (handler != null)
handler(getBlocksPayload);
}
break;
case "getheaders":
{
var getHeadersPayload = NetworkEncoder.DecodeGetBlocksPayload(payload.ToMemoryStream());
var handler = this.OnGetHeaders;
if (handler != null)
handler(getHeadersPayload);
}
break;
case "headers":
{
var headerStream = payload.ToMemoryStream();
using (var reader = new BinaryReader(headerStream))
{
var headerCount = reader.ReadVarInt().ToIntChecked();
for (var i = 0; i < headerCount; i++)
{
var blockHeader = NetworkEncoder.DecodeBlockHeader(headerStream);
//TODO wiki says this is a byte and a var int, which is it?
var txCount = reader.ReadVarInt();
var handler = this.OnBlockHeader;
if (handler != null)
handler(blockHeader);
}
}
}
break;
case "inv":
{
var invPayload = NetworkEncoder.DecodeInventoryPayload(payload.ToMemoryStream());
var handler = this.OnInventoryVectors;
if (handler != null)
handler(invPayload.InventoryVectors);
}
break;
case "notfound":
{
var invPayload = NetworkEncoder.DecodeInventoryPayload(payload.ToMemoryStream());
var handler = this.OnNotFound;
if (handler != null)
handler(invPayload.InventoryVectors);
}
break;
case "ping":
{
var handler = this.OnPing;
if (handler != null)
handler(payload.ToImmutableArray());
}
break;
case "tx":
{
var tx = NetworkEncoder.DecodeTransaction(payload.ToMemoryStream());
var handler = this.OnTransaction;
if (handler != null)
handler(tx);
}
break;
case "version":
{
var versionPayload = NetworkEncoder.DecodeVersionPayload(payload.ToMemoryStream(), payload.Length);
//Debug.WriteLine(string.Format("{0}, {1}", versionPayload.RemoteAddress.ToIPEndPoint(), this.socket.RemoteEndPoint));
var handler = this.OnVersion;
if (handler != null)
handler(versionPayload);
}
break;
case "verack":
{
var handler = this.OnVersionAcknowledged;
if (handler != null)
handler();
}
break;
default:
{
Debug.WriteLine("Unhandled incoming message: {0}".Format2(message.Command));
}
break;
}
//TODO
//if (payloadStream.Position != payloadStream.Length)
//{
// var exMessage = string.Format("Wrong number of bytes read for {0}, parser error: read {1} bytes from a {2} byte payload", message.Command, payloadStream.Position, payloadStream.Length);
// Debug.WriteLine(exMessage);
// throw new Exception(exMessage);
//}
return message;
}
