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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Security;
using System.Threading;
using System.Threading.Tasks;
using Emby.Common.Implementations.Networking;
using MediaBrowser.Model.Net;
namespace Emby.Common.Implementations.Net
{
// THIS IS A LINKED FILE - SHARED AMONGST MULTIPLE PLATFORMS
// Be careful to check any changes compile and work for all platform projects it is shared in.
internal sealed class UdpSocket : DisposableManagedObjectBase, ISocket
{
#region Fields
private Socket _Socket;
private int _LocalPort;
#endregion
public UdpSocket(Socket socket, int localPort, IPAddress ip)
{
if (socket == null) throw new ArgumentNullException("socket");
_Socket = socket;
_LocalPort = localPort;
LocalIPAddress = NetworkManager.ToIpAddressInfo(ip);
_Socket.Bind(new IPEndPoint(ip, _LocalPort));
}
public UdpSocket(Socket socket, IpEndPointInfo endPoint)
{
if (socket == null) throw new ArgumentNullException("socket");
_Socket = socket;
_Socket.Connect(NetworkManager.ToIPEndPoint(endPoint));
}
public IpAddressInfo LocalIPAddress
{
get;
private set;
}
#region ISocket Members
public Task<SocketReceiveResult> ReceiveAsync(CancellationToken cancellationToken)
{
ThrowIfDisposed();
var tcs = new TaskCompletionSource<SocketReceiveResult>();
EndPoint receivedFromEndPoint = new IPEndPoint(IPAddress.Any, 0);
var state = new AsyncReceiveState(_Socket, receivedFromEndPoint);
state.TaskCompletionSource = tcs;
#if NETSTANDARD1_6
_Socket.ReceiveFromAsync(new ArraySegment<Byte>(state.Buffer), SocketFlags.None, state.RemoteEndPoint)
.ContinueWith((task, asyncState) =>
{
if (task.Status != TaskStatus.Faulted)
{
var receiveState = asyncState as AsyncReceiveState;
receiveState.RemoteEndPoint = task.Result.RemoteEndPoint;
ProcessResponse(receiveState, () => task.Result.ReceivedBytes, LocalIPAddress);
}
}, state);
#else
_Socket.BeginReceiveFrom(state.Buffer, 0, state.Buffer.Length, SocketFlags.None, ref state.RemoteEndPoint, ProcessResponse, state);
#endif
return tcs.Task;
}
public Task SendAsync(byte[] buffer, int size, IpEndPointInfo endPoint, CancellationToken cancellationToken)
{
ThrowIfDisposed();
if (buffer == null) throw new ArgumentNullException("messageData");
if (endPoint == null) throw new ArgumentNullException("endPoint");
var ipEndPoint = NetworkManager.ToIPEndPoint(endPoint);
#if NETSTANDARD1_6
if (size != buffer.Length)
{
byte[] copy = new byte[size];
Buffer.BlockCopy(buffer, 0, copy, 0, size);
buffer = copy;
}
cancellationToken.ThrowIfCancellationRequested();
_Socket.SendTo(buffer, ipEndPoint);
return Task.FromResult(true);
#else
var taskSource = new TaskCompletionSource<bool>();
try
{
_Socket.BeginSendTo(buffer, 0, size, SocketFlags.None, ipEndPoint, result =>
{
if (cancellationToken.IsCancellationRequested)
{
taskSource.TrySetCanceled();
return;
}
try
{
_Socket.EndSend(result);
taskSource.TrySetResult(true);
}
catch (Exception ex)
{
taskSource.TrySetException(ex);
}
}, null);
}
catch (Exception ex)
{
taskSource.TrySetException(ex);
}
//_Socket.SendTo(messageData, new System.Net.IPEndPoint(IPAddress.Parse(RemoteEndPoint.IPAddress), RemoteEndPoint.Port));
return taskSource.Task;
#endif
}
#endregion
#region Overrides
protected override void Dispose(bool disposing)
{
if (disposing)
{
var socket = _Socket;
if (socket != null)
socket.Dispose();
}
}
#endregion
#region Private Methods
private static void ProcessResponse(AsyncReceiveState state, Func<int> receiveData, IpAddressInfo localIpAddress)
{
try
{
var bytesRead = receiveData();
var ipEndPoint = state.RemoteEndPoint as IPEndPoint;
state.TaskCompletionSource.SetResult(
new SocketReceiveResult
{
Buffer = state.Buffer,
ReceivedBytes = bytesRead,
RemoteEndPoint = ToIpEndPointInfo(ipEndPoint),
LocalIPAddress = localIpAddress
}
);
}
catch (ObjectDisposedException)
{
state.TaskCompletionSource.SetCanceled();
}
catch (SocketException se)
{
if (se.SocketErrorCode != SocketError.Interrupted && se.SocketErrorCode != SocketError.OperationAborted && se.SocketErrorCode != SocketError.Shutdown)
state.TaskCompletionSource.SetException(se);
else
state.TaskCompletionSource.SetCanceled();
}
catch (Exception ex)
{
state.TaskCompletionSource.SetException(ex);
}
}
private static IpEndPointInfo ToIpEndPointInfo(IPEndPoint endpoint)
{
if (endpoint == null)
{
return null;
}
return NetworkManager.ToIpEndPointInfo(endpoint);
}
private void ProcessResponse(IAsyncResult asyncResult)
{
#if NET46
var state = asyncResult.AsyncState as AsyncReceiveState;
try
{
var bytesRead = state.Socket.EndReceiveFrom(asyncResult, ref state.RemoteEndPoint);
var ipEndPoint = state.RemoteEndPoint as IPEndPoint;
state.TaskCompletionSource.SetResult(
new SocketReceiveResult
{
Buffer = state.Buffer,
ReceivedBytes = bytesRead,
RemoteEndPoint = ToIpEndPointInfo(ipEndPoint),
LocalIPAddress = LocalIPAddress
}
);
}
catch (ObjectDisposedException)
{
state.TaskCompletionSource.SetCanceled();
}
catch (Exception ex)
{
state.TaskCompletionSource.SetException(ex);
}
#endif
}
#endregion
#region Private Classes
private class AsyncReceiveState
{
public AsyncReceiveState(Socket socket, EndPoint remoteEndPoint)
{
this.Socket = socket;
this.RemoteEndPoint = remoteEndPoint;
}
public EndPoint RemoteEndPoint;
public byte[] Buffer = new byte[8192];
public Socket Socket { get; private set; }
public TaskCompletionSource<SocketReceiveResult> TaskCompletionSource { get; set; }
}
#endregion
}
}
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