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789 lines (669 loc) · 28.1 KB
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using System;
using System.Diagnostics;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace NetCoreServer
{
/// <summary>
/// UDP server is used to send or multicast datagrams to UDP endpoints
/// </summary>
/// <remarks>Thread-safe</remarks>
public class UdpServer : IDisposable
{
/// <summary>
/// Initialize UDP server with a given IP address and port number
/// </summary>
/// <param name="address">IP address</param>
/// <param name="port">Port number</param>
public UdpServer(IPAddress address, int port) : this(new IPEndPoint(address, port)) {}
/// <summary>
/// Initialize UDP server with a given IP address and port number
/// </summary>
/// <param name="address">IP address</param>
/// <param name="port">Port number</param>
public UdpServer(string address, int port) : this(new IPEndPoint(IPAddress.Parse(address), port)) {}
/// <summary>
/// Initialize UDP server with a given IP endpoint
/// </summary>
/// <param name="endpoint">IP endpoint</param>
public UdpServer(IPEndPoint endpoint)
{
Id = Guid.NewGuid();
Endpoint = endpoint;
}
/// <summary>
/// Server Id
/// </summary>
public Guid Id { get; }
/// <summary>
/// IP endpoint
/// </summary>
public IPEndPoint Endpoint { get; private set; }
/// <summary>
/// Multicast IP endpoint
/// </summary>
public IPEndPoint MulticastEndpoint { get; private set; }
/// <summary>
/// Socket
/// </summary>
public Socket Socket { get; private set; }
/// <summary>
/// Number of bytes pending sent by the server
/// </summary>
public long BytesPending { get; private set; }
/// <summary>
/// Number of bytes sending by the server
/// </summary>
public long BytesSending { get; private set; }
/// <summary>
/// Number of bytes sent by the server
/// </summary>
public long BytesSent { get; private set; }
/// <summary>
/// Number of bytes received by the server
/// </summary>
public long BytesReceived { get; private set; }
/// <summary>
/// Number of datagrams sent by the server
/// </summary>
public long DatagramsSent { get; private set; }
/// <summary>
/// Number of datagrams received by the server
/// </summary>
public long DatagramsReceived { get; private set; }
/// <summary>
/// Option: reuse address
/// </summary>
/// <remarks>
/// This option will enable/disable SO_REUSEADDR if the OS support this feature
/// </remarks>
public bool OptionReuseAddress { get; set; }
/// <summary>
/// Option: reuse port
/// </summary>
/// <remarks>
/// This option will enable/disable SO_REUSEPORT if the OS support this feature
/// </remarks>
public bool OptionReusePort { get; set; }
/// <summary>
/// Option: receive buffer size
/// </summary>
public int OptionReceiveBufferSize
{
get => Socket.ReceiveBufferSize;
set => Socket.ReceiveBufferSize = value;
}
/// <summary>
/// Option: send buffer size
/// </summary>
public int OptionSendBufferSize
{
get => Socket.SendBufferSize;
set => Socket.SendBufferSize = value;
}
#region Connect/Disconnect client
/// <summary>
/// Is the server started?
/// </summary>
public bool IsStarted { get; private set; }
/// <summary>
/// Start the server (synchronous)
/// </summary>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public virtual bool Start()
{
Debug.Assert(!IsStarted, "UDP server is already started!");
if (IsStarted)
return false;
// Setup buffers
_receiveBuffer = new Buffer();
_sendBuffer = new Buffer();
// Setup event args
_receiveEventArg = new SocketAsyncEventArgs();
_receiveEventArg.Completed += OnAsyncCompleted;
_sendEventArg = new SocketAsyncEventArgs();
_sendEventArg.Completed += OnAsyncCompleted;
// Create a new server socket
Socket = new Socket(Endpoint.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
// Apply the option: reuse address
if (OptionReuseAddress)
Socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
// Apply the option: reuse port
/*
if (OptionReusePort)
Socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReusePort, true);
*/
// Bind the server socket to the IP endpoint
Socket.Bind(Endpoint);
// Prepare receive endpoint
_receiveEndpoint = new IPEndPoint((Endpoint.AddressFamily == AddressFamily.InterNetworkV6) ? IPAddress.IPv6Any : IPAddress.Any, 0);
// Prepare receive & send buffers
_receiveBuffer.Reserve(OptionReceiveBufferSize);
// Reset statistic
BytesPending = 0;
BytesSending = 0;
BytesSent = 0;
BytesReceived = 0;
DatagramsSent = 0;
DatagramsReceived = 0;
// Update the started flag
IsStarted = true;
// Call the server started handler
OnStarted();
return true;
}
/// <summary>
/// Start the server with a given multicast IP address and port number (synchronous)
/// </summary>
/// <param name="multicastAddress">Multicast IP address</param>
/// <param name="multicastPort">Multicast port number</param>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public virtual bool Start(IPAddress multicastAddress, int multicastPort) { return Start(new IPEndPoint(multicastAddress, multicastPort)); }
/// <summary>
/// Start the server with a given multicast IP address and port number (synchronous)
/// </summary>
/// <param name="multicastAddress">Multicast IP address</param>
/// <param name="multicastPort">Multicast port number</param>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public virtual bool Start(string multicastAddress, int multicastPort) { return Start(new IPEndPoint(IPAddress.Parse(multicastAddress), multicastPort)); }
/// <summary>
/// Start the server with a given multicast endpoint (synchronous)
/// </summary>
/// <param name="multicastEndpoint">Multicast IP endpoint</param>
/// <returns>'true' if the server was successfully started, 'false' if the server failed to start</returns>
public virtual bool Start(IPEndPoint multicastEndpoint)
{
MulticastEndpoint = multicastEndpoint;
return Start();
}
/// <summary>
/// Stop the server (synchronous)
/// </summary>
/// <returns>'true' if the server was successfully stopped, 'false' if the server is already stopped</returns>
public virtual bool Stop()
{
Debug.Assert(IsStarted, "UDP server is not started!");
if (!IsStarted)
return false;
// Reset event args
_receiveEventArg.Completed -= OnAsyncCompleted;
_sendEventArg.Completed -= OnAsyncCompleted;
try
{
// Close the session socket
Socket.Close();
// Dispose the session socket
Socket.Dispose();
}
catch (ObjectDisposedException) {}
// Update the started flag
IsStarted = false;
// Update sending/receiving flags
_receiving = false;
_sending = false;
// Clear send/receive buffers
ClearBuffers();
// Call the server stopped handler
OnStopped();
return true;
}
/// <summary>
/// Restart the server (synchronous)
/// </summary>
/// <returns>'true' if the server was successfully restarted, 'false' if the server failed to restart</returns>
public virtual bool Restart()
{
if (!Stop())
return false;
return Start();
}
#endregion
#region Send/Recieve data
// Receive and send endpoints
EndPoint _receiveEndpoint;
EndPoint _sendEndpoint;
// Receive buffer
private bool _receiving;
private Buffer _receiveBuffer;
private SocketAsyncEventArgs _receiveEventArg;
// Send buffer
private bool _sending;
private Buffer _sendBuffer;
private SocketAsyncEventArgs _sendEventArg;
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <returns>Size of multicasted datagram</returns>
public virtual long Multicast(byte[] buffer) { return Multicast(buffer, 0, buffer.Length); }
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of multicasted datagram</returns>
public virtual long Multicast(byte[] buffer, long offset, long size) { return Send(MulticastEndpoint, buffer, offset, size); }
/// <summary>
/// Multicast text to the prepared mulicast endpoint (synchronous)
/// </summary>
/// <param name="text">Text string to multicast</param>
/// <returns>Size of multicasted datagram</returns>
public virtual long Multicast(string text) { return Multicast(Encoding.UTF8.GetBytes(text)); }
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <returns>'true' if the datagram was successfully multicasted, 'false' if the datagram was not multicasted</returns>
public virtual bool MulticastAsync(byte[] buffer) { return MulticastAsync(buffer, 0, buffer.Length); }
/// <summary>
/// Multicast datagram to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to multicast</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>'true' if the datagram was successfully multicasted, 'false' if the datagram was not multicasted</returns>
public virtual bool MulticastAsync(byte[] buffer, long offset, long size) { return SendAsync(MulticastEndpoint, buffer, offset, size); }
/// <summary>
/// Multicast text to the prepared mulicast endpoint (asynchronous)
/// </summary>
/// <param name="text">Text string to multicast</param>
/// <returns>'true' if the text was successfully multicasted, 'false' if the text was not multicasted</returns>
public virtual bool MulticastAsync(string text) { return MulticastAsync(Encoding.UTF8.GetBytes(text)); }
/// <summary>
/// Send datagram to the connected server (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to send</param>
/// <returns>Size of sent datagram</returns>
public virtual long Send(byte[] buffer) { return Send(buffer, 0, buffer.Length); }
/// <summary>
/// Send datagram to the connected server (synchronous)
/// </summary>
/// <param name="buffer">Datagram buffer to send</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of sent datagram</returns>
public virtual long Send(byte[] buffer, long offset, long size) { return Send(Endpoint, buffer, offset, size); }
/// <summary>
/// Send text to the connected server (synchronous)
/// </summary>
/// <param name="text">Text string to send</param>
/// <returns>Size of sent datagram</returns>
public virtual long Send(string text) { return Send(Encoding.UTF8.GetBytes(text)); }
/// <summary>
/// Send datagram to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <returns>Size of sent datagram</returns>
public virtual long Send(EndPoint endpoint, byte[] buffer) { return Send(endpoint, buffer, 0, buffer.Length); }
/// <summary>
/// Send datagram to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of sent datagram</returns>
public virtual long Send(EndPoint endpoint, byte[] buffer, long offset, long size)
{
if (!IsStarted)
return 0;
if (size == 0)
return 0;
try
{
// Sent datagram to the client
int sent = Socket.SendTo(buffer, (int)offset, (int)size, SocketFlags.None, endpoint);
if (sent > 0)
{
// Update statistic
DatagramsSent++;
BytesSent += sent;
// Call the datagram sent handler
OnSent(endpoint, sent);
}
return sent;
}
catch (ObjectDisposedException) { return 0; }
catch (SocketException ex)
{
SendError(ex.SocketErrorCode);
return 0;
}
}
/// <summary>
/// Send text to the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="text">Text string to send</param>
/// <returns>Size of sent datagram</returns>
public virtual long Send(EndPoint endpoint, string text) { return Send(endpoint, Encoding.UTF8.GetBytes(text)); }
/// <summary>
/// Send datagram to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>
public virtual bool SendAsync(EndPoint endpoint, byte[] buffer) { return SendAsync(endpoint, buffer, 0, buffer.Length); }
/// <summary>
/// Send datagram to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="buffer">Datagram buffer to send</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>'true' if the datagram was successfully sent, 'false' if the datagram was not sent</returns>
public virtual bool SendAsync(EndPoint endpoint, byte[] buffer, long offset, long size)
{
if (_sending)
return false;
if (!IsStarted)
return false;
if (size == 0)
return true;
// Fill the main send buffer
_sendBuffer.Append(buffer, offset, size);
// Update statistic
BytesSending = _sendBuffer.Size;
// Update send endpoint
_sendEndpoint = endpoint;
// Try to send the main buffer
TrySend();
return true;
}
/// <summary>
/// Send text to the given endpoint (asynchronous)
/// </summary>
/// <param name="endpoint">Endpoint to send</param>
/// <param name="text">Text string to send</param>
/// <returns>'true' if the text was successfully sent, 'false' if the text was not sent</returns>
public virtual bool SendAsync(EndPoint endpoint, string text) { return SendAsync(endpoint, Encoding.UTF8.GetBytes(text)); }
/// <summary>
/// Receive a new datagram from the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to receive from</param>
/// <param name="buffer">Datagram buffer to receive</param>
/// <returns>Size of received datagram</returns>
public virtual long Receive(ref EndPoint endpoint, byte[] buffer) { return Receive(ref endpoint, buffer, 0, buffer.Length); }
/// <summary>
/// Receive a new datagram from the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to receive from</param>
/// <param name="buffer">Datagram buffer to receive</param>
/// <param name="offset">Datagram buffer offset</param>
/// <param name="size">Datagram buffer size</param>
/// <returns>Size of received datagram</returns>
public virtual long Receive(ref EndPoint endpoint, byte[] buffer, long offset, long size)
{
if (!IsStarted)
return 0;
if (size == 0)
return 0;
try
{
// Receive datagram from the client
int received = Socket.ReceiveFrom(buffer, (int)offset, (int)size, SocketFlags.None, ref endpoint);
if (received > 0)
{
// Update statistic
DatagramsReceived++;
BytesReceived += received;
// Call the datagram received handler
OnReceived(endpoint, buffer, offset, size);
}
return received;
}
catch (ObjectDisposedException) { return 0; }
catch (SocketException ex)
{
SendError(ex.SocketErrorCode);
return 0;
}
}
/// <summary>
/// Receive text from the given endpoint (synchronous)
/// </summary>
/// <param name="endpoint">Endpoint to receive from</param>
/// <param name="size">Text size to receive</param>
/// <returns>Received text</returns>
public virtual string Receive(ref EndPoint endpoint, long size)
{
var buffer = new byte[size];
var length = Receive(ref endpoint, buffer);
return Encoding.UTF8.GetString(buffer, 0, (int)length);
}
/// <summary>
/// Receive datagram from the client (asynchronous)
/// </summary>
public virtual void ReceiveAsync() { TryReceive(); }
/// <summary>
/// Try to receive new data
/// </summary>
private void TryReceive()
{
if (_receiving)
return;
if (!IsStarted)
return;
try
{
// Async receive with the receive handler
_receiving = true;
_receiveEventArg.RemoteEndPoint = _receiveEndpoint;
_receiveEventArg.SetBuffer(_receiveBuffer.Data, 0, (int)_receiveBuffer.Capacity);
if (!Socket.ReceiveFromAsync(_receiveEventArg))
ProcessReceiveFrom(_receiveEventArg);
}
catch (ObjectDisposedException) {}
}
/// <summary>
/// Try to send pending data
/// </summary>
private void TrySend()
{
if (_sending)
return;
if (!IsStarted)
return;
try
{
// Async write with the write handler
_sending = true;
_sendEventArg.RemoteEndPoint = _sendEndpoint;
_sendEventArg.SetBuffer(_sendBuffer.Data, 0, (int)(_sendBuffer.Size));
if (!Socket.SendToAsync(_sendEventArg))
ProcessSendTo(_sendEventArg);
}
catch (ObjectDisposedException) {}
}
/// <summary>
/// Clear send/receive buffers
/// </summary>
private void ClearBuffers()
{
// Clear send buffers
_sendBuffer.Clear();
// Update statistic
BytesPending = 0;
BytesSending = 0;
}
#endregion
#region IO processing
/// <summary>
/// This method is called whenever a receive or send operation is completed on a socket
/// </summary>
private void OnAsyncCompleted(object sender, SocketAsyncEventArgs e)
{
// Determine which type of operation just completed and call the associated handler
switch (e.LastOperation)
{
case SocketAsyncOperation.ReceiveFrom:
ProcessReceiveFrom(e);
break;
case SocketAsyncOperation.SendTo:
ProcessSendTo(e);
break;
default:
throw new ArgumentException("The last operation completed on the socket was not a receive or send");
}
}
/// <summary>
/// This method is invoked when an asynchronous receive from operation completes
/// </summary>
private void ProcessReceiveFrom(SocketAsyncEventArgs e)
{
_receiving = false;
if (!IsStarted)
return;
// Check for error
if (e.SocketError != SocketError.Success)
{
SendError(e.SocketError);
// Call the datagram received zero handler
OnReceived(e.RemoteEndPoint, _receiveBuffer.Data, 0, 0);
return;
}
long size = e.BytesTransferred;
// Received some data from the client
if (size > 0)
{
// Update statistic
DatagramsReceived++;
BytesReceived += size;
// Call the datagram received handler
OnReceived(e.RemoteEndPoint, _receiveBuffer.Data, 0, size);
// If the receive buffer is full increase its size
if (_receiveBuffer.Capacity == size)
_receiveBuffer.Reserve(2 * size);
}
}
/// <summary>
/// This method is invoked when an asynchronous send to operation completes
/// </summary>
private void ProcessSendTo(SocketAsyncEventArgs e)
{
_sending = false;
if (!IsStarted)
return;
// Check for error
if (e.SocketError != SocketError.Success)
{
SendError(e.SocketError);
// Call the buffer sent zero handler
OnSent(_sendEndpoint, 0);
return;
}
long sent = e.BytesTransferred;
// Send some data to the client
if (sent > 0)
{
// Update statistic
BytesSending = 0;
BytesSent += sent;
// Clear the send buffer
_sendBuffer.Clear();
// Call the buffer sent handler
OnSent(_sendEndpoint, sent);
}
}
#endregion
#region Session handlers
/// <summary>
/// Handle server started notification
/// </summary>
protected virtual void OnStarted() {}
/// <summary>
/// Handle server stopped notification
/// </summary>
protected virtual void OnStopped() {}
/// <summary>
/// Handle datagram received notification
/// </summary>
/// <param name="endpoint">Received endpoint</param>
/// <param name="buffer">Received datagram buffer</param>
/// <param name="offset">Received datagram buffer offset</param>
/// <param name="size">Received datagram buffer size</param>
/// <remarks>
/// Notification is called when another datagram was received from some endpoint
/// </remarks>
protected virtual void OnReceived(EndPoint endpoint, byte[] buffer, long offset, long size) {}
/// <summary>
/// Handle datagram sent notification
/// </summary>
/// <param name="endpoint">Endpoint of sent datagram</param>
/// <param name="sent">Size of sent datagram buffer</param>
/// <remarks>
/// Notification is called when a datagram was sent to the client.
/// This handler could be used to send another datagram to the client for instance when the pending size is zero.
/// </remarks>
protected virtual void OnSent(EndPoint endpoint, long sent) {}
/// <summary>
/// Handle error notification
/// </summary>
/// <param name="error">Socket error code</param>
protected virtual void OnError(SocketError error) {}
#endregion
#region Error handling
/// <summary>
/// Send error notification
/// </summary>
/// <param name="error">Socket error code</param>
private void SendError(SocketError error)
{
// Skip disconnect errors
if ((error == SocketError.ConnectionAborted) ||
(error == SocketError.ConnectionRefused) ||
(error == SocketError.ConnectionReset) ||
(error == SocketError.OperationAborted) ||
(error == SocketError.Shutdown))
return;
OnError(error);
}
#endregion
#region IDisposable implementation
// Disposed flag.
private bool _disposed;
// Implement IDisposable.
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposingManagedResources)
{
// The idea here is that Dispose(Boolean) knows whether it is
// being called to do explicit cleanup (the Boolean is true)
// versus being called due to a garbage collection (the Boolean
// is false). This distinction is useful because, when being
// disposed explicitly, the Dispose(Boolean) method can safely
// execute code using reference type fields that refer to other
// objects knowing for sure that these other objects have not been
// finalized or disposed of yet. When the Boolean is false,
// the Dispose(Boolean) method should not execute code that
// refer to reference type fields because those objects may
// have already been finalized."
if (!_disposed)
{
if (disposingManagedResources)
{
// Dispose managed resources here...
Stop();
}
// Dispose unmanaged resources here...
// Set large fields to null here...
// Mark as disposed.
_disposed = true;
}
}
// Use C# destructor syntax for finalization code.
~UdpServer()
{
// Simply call Dispose(false).
Dispose(false);
}
#endregion
}
}