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PooledSocket.cs
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PooledSocket.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace Guanima.Redis
{
[DebuggerDisplay("[ Address: {_endpoint}, IsAlive = {IsAlive} ]")]
public class PooledSocket : IDisposable
{
private readonly byte[] CrLf = new[] { (byte)'\r', (byte)'\n' };
private static log4net.ILog log = log4net.LogManager.GetLogger(typeof(PooledSocket));
private bool _isAlive = true;
private Socket _socket;
private Action<PooledSocket> _cleanupCallback;
private readonly IPEndPoint _endpoint;
private readonly NetworkStream _stream;
private BufferedStream _inputStream;
private BufferedStream _wStream;
internal PooledSocket(IPEndPoint endpoint, TimeSpan connectionTimeout, TimeSpan receiveTimeout, Action<PooledSocket> cleanupCallback)
{
_endpoint = endpoint;
_cleanupCallback = cleanupCallback;
_socket = new Socket(endpoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, connectionTimeout == TimeSpan.MaxValue ? Timeout.Infinite : (int)connectionTimeout.TotalMilliseconds);
_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, receiveTimeout == TimeSpan.MaxValue ? Timeout.Infinite : (int)receiveTimeout.TotalMilliseconds);
// all operations are "atomic", we do not send small chunks of data
_socket.NoDelay = true;
_socket.Connect(endpoint);
_stream = new NetworkStream(_socket);
//_inputStream = new BufferedStream(new BasicNetworkStream(_socket));
_inputStream = new BufferedStream(_stream, 16 * 1024);
_wStream = new BufferedStream(_stream, 16 * 1024);
}
public IRedisNode OwnerNode { get; internal set; }
public int CurrentDb { get; internal set; }
public int Available
{
get { return _socket.Available; }
}
public void Reset()
{
//this.LockToThread();
// discard any buffered data
_inputStream.Flush();
int available = _socket.Available;
if (available > 0)
{
if (log.IsWarnEnabled)
log.WarnFormat("Socket bound to {0} has {1} unread data! This is probably a bug in the code. InstanceID was {2}.", _socket.RemoteEndPoint, available, InstanceId);
var data = new byte[available];
Read(data, 0, available);
if (log.IsWarnEnabled)
log.Warn(Encoding.ASCII.GetString(data));
}
_wStream.Seek(0, SeekOrigin.Begin); // ??
if (log.IsDebugEnabled)
log.DebugFormat("Socket {0} was reset", InstanceId);
}
/// <summary>
/// The ID of this instance. Used by the <see cref="T:RedisServer"/> to identify the instance in its inner lists.
/// </summary>
public readonly Guid InstanceId = Guid.NewGuid();
public bool IsAlive
{
get { return _isAlive; }
}
public bool IsAuthorized
{
get; internal set;
}
/// <summary>
/// Releases all resources used by this instance and shuts down the inner <see cref="T:Socket"/>. This instance will not be usable anymore.
/// </summary>
/// <remarks>Use the IDisposable.Dispose method if you want to release this instance back into the pool.</remarks>
public void Destroy() // TODO this should be a Dispose() override
{
this.Dispose(true);
}
protected void Dispose(bool disposing)
{
if (disposing)
{
GC.SuppressFinalize(this);
if (_socket != null)
{
using (_socket)
_socket.Shutdown(SocketShutdown.Both);
}
_inputStream.Dispose();
_inputStream = null;
_wStream.Dispose();
_wStream = null;
_socket = null;
_cleanupCallback = null;
}
else
{
Action<PooledSocket> cc = _cleanupCallback;
if (cc != null)
{
cc(this);
}
}
}
void IDisposable.Dispose()
{
Dispose(false);
}
private void CheckDisposed()
{
if (_socket == null)
throw new ObjectDisposedException("PooledSocket");
}
/// <summary>
/// Reads the next byte from the server's response.
/// </summary>
/// <remarks>This method blocks and will not return until the value is read.</remarks>
public int ReadByte()
{
CheckDisposed();
try
{
return _inputStream.ReadByte();
}
catch (IOException)
{
_isAlive = false;
throw;
}
}
/// <summary>
/// Reads data from the server into the specified buffer.
/// </summary>
/// <param name="buffer">An array of <see cref="T:System.Byte"/> that is the storage location for the received data.</param>
/// <param name="offset">The location in buffer to store the received data.</param>
/// <param name="count">The number of bytes to read.</param>
/// <remarks>This method blocks and will not return until the specified amount of bytes are read.</remarks>
public void Read(byte[] buffer, int offset, int count)
{
CheckDisposed();
int read = 0;
int shouldRead = count;
while (read < count)
{
try
{
int currentRead = _inputStream.Read(buffer, offset, shouldRead);
if (currentRead < 1)
continue;
read += currentRead;
offset += currentRead;
shouldRead -= currentRead;
}
catch (IOException)
{
_isAlive = false;
throw;
}
}
}
/// <summary>
/// Receives a set number of bytes from the network
/// </summary>
/// <param name="byteCount">The byte count.</param>
/// <returns>The received bytes</returns>
public byte[] ReceiveBytes(int byteCount)
{
// Check.IsInRange(byteCount, 0, Int32.MaxValue, "byteCount");
var buf = new byte[byteCount];
Read(buf, 0, byteCount);
return buf;
}
public string ReadLine()
{
var sb = new StringBuilder();
int c;
while ((c = ReadByte()) != -1)
{
if (c == '\r')
continue;
if (c == '\n')
break;
sb.Append((char)c);
}
return sb.ToString();
}
public void Write(ArraySegment<byte> data)
{
Write(data.Array, data.Offset, data.Count);
}
public void Write(byte[] data)
{
Write(data, 0, data.Length);
}
/// <summary>
/// Sends the new line to the network (\r\n)
/// </summary>
public void WriteNewLine()
{
Write(new byte[] { 0xd, 0xa });
}
public void Write(byte[] data, int offset, int length)
{
CheckDisposed();
SocketError status;
_socket.Send(data, offset, length, SocketFlags.None, out status);
if (status != SocketError.Success)
{
_isAlive = false;
ThrowHelper.ThrowSocketWriteError(_endpoint, status);
}
}
public void Write(IList<ArraySegment<byte>> buffers)
{
CheckDisposed();
SocketError status;
_socket.Send(buffers, SocketFlags.None, out status);
if (status != SocketError.Success)
{
_isAlive = false;
ThrowHelper.ThrowSocketWriteError(_endpoint, status);
}
}
private static byte[] GetCmdBytes(char cmdPrefix, int noOfLines)
{
var strLines = noOfLines.ToString();
var strLinesLength = strLines.Length;
var cmdBytes = new byte[1 + strLinesLength + 2];
cmdBytes[0] = (byte)cmdPrefix;
for (var i = 0; i < strLinesLength; i++)
cmdBytes[i + 1] = (byte)strLines[i];
cmdBytes[1 + strLinesLength] = 0x0D; // \r
cmdBytes[2 + strLinesLength] = 0x0A; // \n
return cmdBytes;
}
public bool SendCommand(params byte[][] cmdWithBinaryArgs)
{
return SendCommand(true, cmdWithBinaryArgs);
}
/// <summary>
/// Command to set multiple binary safe arguments
/// </summary>
/// <param name="flush"></param>
/// <param name="cmdWithBinaryArgs"></param>
/// <returns></returns>
public bool SendCommand(bool flush, params byte[][] cmdWithBinaryArgs)
{
CheckDisposed();
//CmdLog(cmdWithBinaryArgs);
//Total command lines count
WriteToSendBuffer(GetCmdBytes('*', cmdWithBinaryArgs.Length));
foreach (var safeBinaryValue in cmdWithBinaryArgs)
{
WriteToSendBuffer(GetCmdBytes('$', safeBinaryValue.Length));
WriteToSendBuffer(safeBinaryValue);
WriteToSendBuffer(CrLf);
}
if (flush)
FlushSendBuffer();
return true;
}
byte[] _cmdBuffer = new byte[32 * 1024];
int _cmdBufferIndex = 0;
public void WriteToSendBuffer(byte[] cmdBytes)
{
if ((_cmdBufferIndex + cmdBytes.Length) > _cmdBuffer.Length)
{
const int breathingSpaceToReduceReallocations = (32 * 1024);
var newLargerBuffer = new byte[_cmdBufferIndex + cmdBytes.Length + breathingSpaceToReduceReallocations];
Buffer.BlockCopy(_cmdBuffer, 0, newLargerBuffer, 0, _cmdBuffer.Length);
_cmdBuffer = newLargerBuffer;
}
Buffer.BlockCopy(cmdBytes, 0, _cmdBuffer, _cmdBufferIndex, cmdBytes.Length);
_cmdBufferIndex += cmdBytes.Length;
}
public void FlushSendBuffer()
{
if (_cmdBufferIndex > 0)
{
CheckDisposed();
_wStream.Write(_cmdBuffer, 0, _cmdBufferIndex);
Write(_cmdBuffer, 0, _cmdBufferIndex);
_cmdBufferIndex = 0;
_wStream.Flush();
}
}
internal Socket Socket
{
get { return _socket; }
}
#region [ BasicNetworkStream ]
private class BasicNetworkStream : Stream
{
private readonly Socket _socket;
public BasicNetworkStream(Socket socket)
{
_socket = socket;
}
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return false; }
}
public override bool CanWrite
{
get { return false; }
}
public override void Flush()
{
}
public override long Length
{
get { throw new NotSupportedException(); }
}
public override long Position
{
get { throw new NotSupportedException(); }
set { throw new NotSupportedException(); }
}
public override int Read(byte[] buffer, int offset, int count)
{
SocketError errorCode;
int retval = _socket.Receive(buffer, offset, count, SocketFlags.None, out errorCode);
if (errorCode == SocketError.Success)
return retval;
throw new IOException(String.Format("Failed to read from the _socket '{0}'. Error: {1}", _socket.RemoteEndPoint, errorCode));
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
}
#endregion
}
}
#region [ License information ]
/* ************************************************************
*
* Copyright (c) Attila Kiskó, enyim.com
*
* This source code is subject to terms and conditions of
* Microsoft Permissive License (Ms-PL).
*
* A copy of the license can be found in the License.html
* file at the root of this distribution. If you can not
* locate the License, please send an email to a@enyim.com
*
* By using this source code in any fashion, you are
* agreeing to be bound by the terms of the Microsoft
* Permissive License.
*
* You must not remove this notice, or any other, from this
* software.
*
* ************************************************************/
#endregion