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RMNP.cs
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RMNP.cs
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// Copyright 2017 Tim Oster. All rights reserved.
// Use of this source code is governed by the MIT license.
// More information can be found in the LICENSE file.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace rmnp
{
public class RMNP
{
internal enum DisconnectType
{
DEFAULT,
SHUTDOWN,
TIMEOUT
}
internal delegate void ReadFunc(Socket socket, ref byte[] buffer, out int length, out IPEndPoint addr, out bool next);
internal delegate void WriteFunc(Socket socket, IPEndPoint addr, ref byte[] buffer);
internal IPEndPoint Address;
internal Socket Socket;
private bool isRunning = false;
private WaitGroup waitGroup = new WaitGroup();
private List<Thread> listeners;
private ExecGuard connectGuard;
private readonly ReaderWriterLockSlim connectionsMutex = new ReaderWriterLockSlim();
private Dictionary<uint, Connection> connections;
internal ReadFunc readFunc;
internal WriteFunc writeFunc;
private Pool<byte[]> bufferPool;
private Pool<Connection> connectionPool;
// callbacks
// for clients: only executed if client is still connected. if client disconnects callback will not be executed.
internal Action<Connection, byte[]> OnConnect;
internal Action<Connection, byte[]> OnDisconnect;
internal Action<Connection, byte[]> OnTimeout;
internal Func<IPEndPoint, byte[], bool> OnValidation;
internal Action<Connection, byte[], Connection.Channel> OnPacket;
protected RMNP() { }
protected void Init(string address)
{
if (!address.Contains(":")) throw new Exception("Port has to be specified");
string[] data = address.Split(':');
this.Address = new IPEndPoint(IPAddress.Parse(data[0]), int.Parse(data[1]));
this.listeners = new List<Thread>();
this.connectGuard = new ExecGuard();
this.connections = new Dictionary<uint, Connection>();
this.bufferPool = new Pool<byte[]>();
this.bufferPool.Allocator = () => { return new byte[Config.CfgMTU]; };
this.connectionPool = new Pool<Connection>();
this.connectionPool.Allocator = () => { return new Connection(); };
Background.Start();
}
// is blocking call!
protected void Destroy()
{
if (this.Address == null) return;
this.isRunning = false;
this.waitGroup.Wait();
this.connectionsMutex.EnterWriteLock();
foreach (Connection conn in this.connections.Values) this.DisconnectClient(conn, DisconnectType.SHUTDOWN, null);
this.connections.Clear();
this.connectionsMutex.ExitWriteLock();
this.Socket.Close();
Background.Stop();
this.Address = null;
this.Socket = null;
this.listeners = null;
this.connectGuard = null;
this.connections = null;
this.listeners = null;
}
protected void SetSocket(Socket socket)
{
this.Socket = socket;
this.Socket.SendBufferSize = Config.CfgMTU;
this.Socket.ReceiveBufferSize = Config.CfgMTU;
this.Socket.Blocking = false;
}
protected void Listen()
{
this.isRunning = true;
for (int i = 0; i < Config.CfgParallelListenerCount; i++)
{
Thread thread = new Thread(this.ListeningWorker);
this.listeners.Add(thread);
thread.Start();
}
}
private void ListeningWorker()
{
this.waitGroup.Start();
Interlocked.Increment(ref Stats.StatRunningGoRoutines);
while (this.isRunning)
{
try
{
int length;
IPEndPoint addr;
bool next;
byte[] buffer = this.bufferPool.Get();
this.Socket.ReceiveTimeout = 1000;
this.readFunc(this.Socket, ref buffer, out length, out addr, out next);
if (!next)
{
this.bufferPool.Put(buffer);
continue;
}
byte[] packet = new byte[length];
Buffer.BlockCopy(buffer, 0, packet, 0, length);
this.bufferPool.Put(buffer);
if (!Packet.ValidateHeader(packet)) continue;
Interlocked.Add(ref Stats.StatReceivedBytes, length);
this.HandlePacket(addr, packet);
}
catch
{
Interlocked.Increment(ref Stats.StatGoRoutinePanics);
}
}
Interlocked.Decrement(ref Stats.StatRunningGoRoutines);
this.waitGroup.End();
}
private void HandlePacket(IPEndPoint addr, byte[] packet)
{
uint hash = Util.AddrHash(addr);
this.connectionsMutex.EnterReadLock();
Connection connection = this.connections.ContainsKey(hash) ? this.connections[hash] : null;
this.connectionsMutex.ExitReadLock();
if (connection == null)
{
if ((packet[5] & (byte)Packet.PacketDescriptor.CONNECT) == 0) return;
if (!this.connectGuard.TryExecute(hash)) return;
int header = Packet.HeaderSize(packet);
if (this.OnValidation != null && !this.OnValidation(addr, packet.Skip(header).ToArray()))
{
Interlocked.Increment(ref Stats.StatDeniedConnects);
return;
}
connection = this.ConnectClient(addr, null);
}
// done this way to ensure that connect callback is executed on client-side
if ((packet[5] & (byte)Packet.PacketDescriptor.CONNECT) != 0)
{
if (connection.UpdateState(Connection.ConnectionState.CONNECTED))
{
int header = Packet.HeaderSize(packet);
// clear buffers so all remaining connection packets are deleted
if (connection.IsServer) connection.OnSuccessfulConnect();
if (this.OnConnect != null) this.OnConnect(connection, packet.Skip(header).ToArray());
this.connectGuard.Finish(hash);
}
return;
}
if ((packet[5] & (byte)Packet.PacketDescriptor.DISCONNECT) != 0)
{
int header = Packet.HeaderSize(packet);
this.DisconnectClient(connection, DisconnectType.DEFAULT, packet.Skip(header).ToArray());
return;
}
Interlocked.Add(ref Stats.StatProcessedBytes, packet.Length);
connection.ProcessReceive(packet);
}
internal Connection ConnectClient(IPEndPoint addr, byte[] data)
{
Interlocked.Increment(ref Stats.StatConnects);
uint hash = Util.AddrHash(addr);
Connection connection = this.connectionPool.Get();
connection.Init(this, addr);
this.connectionsMutex.EnterWriteLock();
this.connections.Add(hash, connection);
this.connectionsMutex.ExitWriteLock();
connection.SendHighLevelPacket(Packet.PacketDescriptor.RELIABLE | Packet.PacketDescriptor.CONNECT, data);
connection.StartRoutines();
return connection;
}
internal void DisconnectClient(Connection connection, DisconnectType disconnectType, byte[] packet)
{
if (!connection.UpdateState(Connection.ConnectionState.DISCONNECTED)) return;
if (disconnectType == DisconnectType.TIMEOUT)
{
Interlocked.Increment(ref Stats.StatTimeouts);
if (this.OnTimeout != null) this.OnTimeout(connection, null);
}
Interlocked.Increment(ref Stats.StatDisconnects);
// send more than necessary so that the packet hopefully arrives
for (int i = 0; i < 10; i++) connection.SendHighLevelPacket(Packet.PacketDescriptor.DISCONNECT, packet);
// give the channel some time to process the packets
Thread.Sleep(20);
connection.StopRoutines();
if (disconnectType != DisconnectType.SHUTDOWN)
{
uint hash = Util.AddrHash(connection.Addr);
this.connectionsMutex.EnterWriteLock();
this.connections.Remove(hash);
this.connectionsMutex.ExitWriteLock();
if (this.OnDisconnect != null) this.OnDisconnect(connection, packet);
}
connection.Reset();
this.connectionPool.Put(connection);
}
}
}