public QueuedIO(IPeerConnection connection, SocketMemory buffer, IRateLimiter rateLimiter, ReusableTaskCompletionSource <int> tcs)
{
this.connection = connection;
this.buffer = buffer;
this.rateLimiter = rateLimiter;
this.tcs = tcs;
}
public new Releaser Rent(int capacity, out SocketMemory memory)
{
var releaser = base.Rent(capacity, out memory);
memory = memory.Slice(0, capacity);
return(releaser);
}
/// <summary>
/// Where possible we will use a SocketAsyncEventArgs object which has already had
/// 'SetBuffer(byte[],int,int)' invoked on it for the given byte[]. Reusing these is
/// much more efficient than constantly calling SetBuffer on a different 'SocketAsyncEventArgs'
/// object.
/// </summary>
/// <param name="buffer">The buffer we wish to get the reusuable 'SocketAsyncEventArgs' for</param>
/// <returns></returns>
static SocketAsyncEventArgs GetSocketAsyncEventArgs(SocketMemory buffer)
{
#if NETSTANDARD2_0
if (buffer.SocketArgs.Buffer == null)
{
buffer.SocketArgs.Completed += Handler;
}
if (!MemoryMarshal.TryGetArray(buffer.Memory, out ArraySegment <byte> segment))
{
throw new ArgumentException("Could not retrieve the underlying buffer");
}
if (buffer.SocketArgs.Buffer == null)
{
buffer.SocketArgs.SetBuffer(segment.Array, segment.Offset, segment.Count);
}
else
{
buffer.SocketArgs.SetBuffer(segment.Offset, segment.Count);
}
#else
if (buffer.SocketArgs.MemoryBuffer.IsEmpty)
{
buffer.SocketArgs.Completed += Handler;
}
buffer.SocketArgs.SetBuffer(buffer.Memory);
#endif
return(buffer.SocketArgs);
}
public static async ReusableTask SendAsync(IPeerConnection connection, SocketMemory buffer, IRateLimiter rateLimiter, SpeedMonitor peerMonitor, SpeedMonitor managerMonitor)
{
await MainLoop.SwitchToThreadpool();
while (buffer.Length > 0)
{
int transferred;
bool unlimited = rateLimiter?.Unlimited ?? true;
int shouldRead = unlimited ? buffer.Length : Math.Min(ChunkLength, buffer.Length);
if (rateLimiter != null && !unlimited && !rateLimiter.TryProcess(shouldRead))
{
var tcs = new ReusableTaskCompletionSource <int> ();
lock (sendQueue)
sendQueue.Enqueue(new QueuedIO(connection, buffer.Slice(0, shouldRead), rateLimiter, tcs));
transferred = await tcs.Task.ConfigureAwait(false);
}
else
{
transferred = await connection.SendAsync(buffer.Slice(0, shouldRead)).ConfigureAwait(false);
}
if (transferred == 0)
{
throw new ConnectionClosedException("Socket send returned 0, indicating the connection has been closed.");
}
peerMonitor?.AddDelta(transferred);
managerMonitor?.AddDelta(transferred);
buffer = buffer.Slice(transferred);
}
}
public static async ReusableTask <(PeerMessage message, PeerMessage.Releaser releaser)> ReceiveMessageAsync(IPeerConnection connection, IEncryption decryptor, IRateLimiter rateLimiter, ConnectionMonitor peerMonitor, ConnectionMonitor managerMonitor, ITorrentData torrentData, SocketMemory buffer)
{
await MainLoop.SwitchToThreadpool();
int messageHeaderLength = 4;
int messageBodyLength;
SocketMemory messageHeaderBuffer = buffer;
SocketMemory messageBuffer = buffer;
ByteBufferPool.Releaser messageHeaderReleaser = default;
ByteBufferPool.Releaser messageBufferReleaser = default;
if (messageHeaderBuffer.IsEmpty)
{
messageHeaderReleaser = NetworkIO.BufferPool.Rent(messageHeaderLength, out messageHeaderBuffer);
}
using (messageHeaderReleaser) {
await NetworkIO.ReceiveAsync(connection, messageHeaderBuffer.Slice(0, messageHeaderLength), rateLimiter, peerMonitor?.ProtocolDown, managerMonitor?.ProtocolDown).ConfigureAwait(false);
decryptor.Decrypt(messageHeaderBuffer.AsSpan(0, messageHeaderLength));
messageBodyLength = Message.ReadInt(messageHeaderBuffer.AsSpan());
if (messageBodyLength < 0 || messageBodyLength > MaxMessageLength)
{
connection.Dispose();
throw new ProtocolException($"Invalid message length received. Value was '{messageBodyLength}'");
}
if (messageBodyLength == 0)
{
return(KeepAliveMessage.Instance, default);
public ReusableTask <int> SendAsync(SocketMemory buffer)
{
SocketAsyncEventArgs args = GetSocketAsyncEventArgs(buffer);
args.UserToken = SendTcs;
AsyncFlowControl?control = null;
if (!ExecutionContext.IsFlowSuppressed())
{
control = ExecutionContext.SuppressFlow();
}
try {
if (!Socket.SendAsync(args))
{
SendTcs.SetResult(buffer.Length);
}
} catch (ObjectDisposedException) {
SendTcs.SetResult(0);
} finally {
control?.Undo();
}
return(SendTcs.Task);
}
/// <summary>
///
/// </summary>
/// <param name="manager">The torrent which the peer is associated with.</param>
/// <param name="id">The peer whose message queue you want to start processing</param>
internal async void TryProcessQueue(TorrentManager manager, PeerId id)
{
if (!id.MessageQueue.BeginProcessing())
{
return;
}
await MainLoop.SwitchToThreadpool();
ByteBufferPool.Releaser socketMemoryReleaser = default;
SocketMemory socketMemory = default;
try {
while (id.MessageQueue.TryDequeue(out PeerMessage msg, out PeerMessage.Releaser msgReleaser))
{
using var autorelease = msgReleaser;
if (socketMemory.IsEmpty || socketMemory.Length < msg.ByteLength)
{
socketMemoryReleaser.Dispose();
(socketMemoryReleaser, socketMemory) = NetworkIO.BufferPool.Rent(msg.ByteLength);
}
var buffer = socketMemory.Slice(0, msg.ByteLength);
if (msg is PieceMessage pm)
{
pm.SetData((default, buffer.Memory.Slice(buffer.Length - pm.RequestLength)));
protected async ReusableTask ReceiveMessageAsync(SocketMemory buffer)
{
if (buffer.Length == 0)
{
return;
}
if (!initialBuffer.IsEmpty)
{
int toCopy = Math.Min(initialBuffer.Length, buffer.Length);
initialBuffer.Span.Slice(0, toCopy).CopyTo(buffer.AsSpan());
initialBuffer = initialBuffer.Slice(toCopy);
if (toCopy != buffer.Length)
{
await NetworkIO.ReceiveAsync(socket, buffer.Slice(toCopy, buffer.Length - toCopy), null, null, null).ConfigureAwait(false);
bytesReceived += buffer.Length - toCopy;
}
}
else
{
await NetworkIO.ReceiveAsync(socket, buffer, null, null, null).ConfigureAwait(false);
bytesReceived += buffer.Length;
}
}
internal async void ReceiveMessagesAsync(IPeerConnection connection, IEncryption decryptor, RateLimiterGroup downloadLimiter, ConnectionMonitor monitor, TorrentManager torrentManager, PeerId id)
{
await MainLoop.SwitchToThreadpool();
SocketMemory currentBuffer = default;
SocketMemory smallBuffer = default;
ByteBufferPool.Releaser smallReleaser = default;
SocketMemory largeBuffer = default;
ByteBufferPool.Releaser largeReleaser = default;
try {
while (true)
{
if (id.AmRequestingPiecesCount == 0)
{
if (!largeBuffer.IsEmpty)
{
largeReleaser.Dispose();
largeReleaser = default;
largeBuffer = currentBuffer = default;
}
if (smallBuffer.IsEmpty)
{
smallReleaser = NetworkIO.BufferPool.Rent(ByteBufferPool.SmallMessageBufferSize, out smallBuffer);
currentBuffer = smallBuffer;
}
}
else
{
if (!smallBuffer.IsEmpty)
{
smallReleaser.Dispose();
smallReleaser = default;
smallBuffer = currentBuffer = default;
}
if (largeBuffer.IsEmpty)
{
largeReleaser = NetworkIO.BufferPool.Rent(ByteBufferPool.LargeMessageBufferSize, out largeBuffer);
currentBuffer = largeBuffer;
}
}
(PeerMessage message, PeerMessage.Releaser releaser) = await PeerIO.ReceiveMessageAsync(connection, decryptor, downloadLimiter, monitor, torrentManager.Monitor, torrentManager, currentBuffer).ConfigureAwait(false);
HandleReceivedMessage(id, torrentManager, message, releaser);
}
} catch {
await ClientEngine.MainLoop;
CleanupSocket(torrentManager, id);
} finally {
smallReleaser.Dispose();
largeReleaser.Dispose();
}
}
private async Task CompleteSendOrReceiveFirst(SocketMemory buffer)
{
var allRequests = new List <RequestMessage> ();
var requestsBuffer = requests.Encode().AsMemory();
while (requestsBuffer.Length > 0)
{
var message = (RequestMessage)PeerMessage.DecodeMessage(requestsBuffer.Span, null).message;
allRequests.Add(message);
requestsBuffer = requestsBuffer.Slice(message.ByteLength);
}
while (allRequests.Count > 0)
{
int size = Message.ReadInt(buffer.Span);
await NetworkIO.ReceiveAsync(connection, buffer.Slice(4, size), null, null, null);
PieceMessage m = (PieceMessage)PeerMessage.DecodeMessage(buffer.AsSpan(0, size + 4), rig.Manager).message;
var request = allRequests[0];
Assert.AreEqual(request.PieceIndex, m.PieceIndex, "#1");
Assert.AreEqual(request.RequestLength, m.RequestLength, "#1");
Assert.AreEqual(request.StartOffset, m.StartOffset, "#1");
for (int i = 0; i < request.RequestLength; i++)
{
if (buffer.Span[i + 13] != (byte)(m.PieceIndex * rig.Torrent.PieceLength + m.StartOffset + i))
{
throw new Exception("Corrupted data received");
}
}
allRequests.RemoveAt(0);
if (allRequests.Count == 0)
{
break;
}
else
{
await NetworkIO.ReceiveAsync(connection, buffer.Slice(0, 4), null, null, null);;
}
}
Uri baseUri = new Uri(ListenerURL);
baseUri = new Uri(baseUri, $"{rig.Manager.Torrent.Name}/");
if (rig.Manager.Torrent.Files.Count > 1)
{
Assert.AreEqual(new Uri(baseUri, rig.Manager.Torrent.Files[0].Path), requestedUrl[0]);
Assert.AreEqual(new Uri(baseUri, rig.Manager.Torrent.Files[1].Path), requestedUrl[1]);
}
}
public async ReusableTask <int> ReceiveAsync(SocketMemory buffer)
{
if (SlowConnection)
{
buffer = buffer.Slice(0, Math.Min(88, buffer.Length));
}
var result = await ReadStream.ReadAsync(buffer.Memory);
Receives.Add(result);
return(ManualBytesReceived ?? result);
}
public async ReusableTask <int> SendAsync(SocketMemory buffer)
{
if (SlowConnection)
{
buffer = buffer.Slice(0, Math.Min(88, buffer.Length));
}
var data = buffer.Memory.ToArray();
await WriteStream.WriteAsync(data, 0, data.Length, CancellationToken.None);
Sends.Add(buffer.Length);
return(ManualBytesSent ?? buffer.Length);
}
async Task Send(SocketMemory buffer, int maxBytesPerChunk = -1)
{
if (maxBytesPerChunk == -1)
{
await NetworkIO.SendAsync(connection, buffer, null, null, null);
}
else
{
while (buffer.Length > 0)
{
var toSend = Math.Min(maxBytesPerChunk, buffer.Length);
await NetworkIO.SendAsync(connection, buffer.Slice(0, toSend), null, null, null);
buffer = buffer.Slice(toSend);
}
}
}
public static ReusableTask SendAsync(IPeerConnection connection, SocketMemory buffer)
{
return(SendAsync(connection, buffer, null, null, null));
}
public ReusableTask <int> SendAsync(SocketMemory buffer)
{
return(ReusableTask.FromResult(0));
}