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using System;

using System.Collections;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Net.Sockets;

using System.Text;

using System.Threading;

using SuperSocket.Common;

using SuperSocket.ProtoBase;

using SuperSocket.SocketBase;

using SuperSocket.SocketBase.Command;

using SuperSocket.SocketBase.Logging;

using SuperSocket.SocketBase.Pool;

using SuperSocket.SocketBase.Protocol;

using SuperSocket.SocketBase.Utils;

namespace SuperSocket.SocketEngine

{

class AsyncSocketSession : SocketSession, IAsyncSocketSession

{

private bool m_IsReset;

private IPool<SaeState> m_SaePoolForReceive;

private SocketAsyncEventArgs m_SocketEventArgSend;

public AsyncSocketSession(Socket client, IPool<SaeState> saePoolForReceive)

: this(client, saePoolForReceive, false)

{

}

public AsyncSocketSession(Socket client, IPool<SaeState> saePoolForReceive, bool isReset)

: base(client)

{

m_SaePoolForReceive = saePoolForReceive;

m_IsReset = isReset;

}

public override void Initialize(IAppSession appSession)

{

base.Initialize(appSession);

if (!SyncSend)

{

//Initialize SocketAsyncEventArgs for sending

m_SocketEventArgSend = new SocketAsyncEventArgs();

m_SocketEventArgSend.Completed += new EventHandler<SocketAsyncEventArgs>(OnSendingCompleted);

}

}

public override void Start()

{

var saeState = m_SaePoolForReceive.Get();

saeState.SocketSession = this;

saeState.Sae.UserToken = saeState;

StartReceive(saeState.Sae);

if (!m_IsReset)

StartSession();

}

bool ProcessCompleted(SocketAsyncEventArgs e)

{

if (e.SocketError == SocketError.Success)

{

if (e.BytesTransferred > 0)

{

return true;

}

}

else

{

LogError((int)e.SocketError);

}

return false;

}

void OnSendingCompleted(object sender, SocketAsyncEventArgs e)

{

var queue = e.UserToken as SendingQueue;

if (!ProcessCompleted(e))

{

ClearPrevSendState(e);

OnSendError(queue, CloseReason.SocketError);

return;

}

ClearPrevSendState(e);

base.OnSendingCompleted(queue);

}

private void ClearPrevSendState(SocketAsyncEventArgs e)

{

e.UserToken = null;

//Clear previous sending buffer of sae to avoid memory leak

if (e.Buffer != null)

{

e.SetBuffer(null, 0, 0);

}

else if (e.BufferList != null)

{

e.BufferList = null;

}

}

private void StartReceive(SocketAsyncEventArgs e)

{

bool willRaiseEvent = false;

try

{

if (IsInClosingOrClosed)

return;

OnReceiveStarted();

willRaiseEvent = Client.ReceiveAsync(e);

}

catch (Exception exc)

{

LogError(exc);

OnReceiveError(CloseReason.SocketError);

return;

}

if (!willRaiseEvent)

{

ProcessReceive(e);

}

}

protected override void SendSync(SendingQueue queue)

{

try

{

for (var i = 0; i < queue.Count; i++)

{

var item = queue[i];

var client = Client;

if (client == null)

return;

client.Send(item.Array, item.Offset, item.Count, SocketFlags.None);

}

OnSendingCompleted(queue);

}

catch (Exception e)

{

LogError(e);

OnSendError(queue, CloseReason.SocketError);

return;

}

}

protected override void SendAsync(SendingQueue queue)

{

try

{

m_SocketEventArgSend.UserToken = queue;

if (queue.Count > 1)

m_SocketEventArgSend.BufferList = queue;

else

{

var item = queue[0];

m_SocketEventArgSend.SetBuffer(item.Array, item.Offset, item.Count);

}

var client = Client;

if (client == null)

{

OnSendError(queue, CloseReason.SocketError);

return;

}

if (!client.SendAsync(m_SocketEventArgSend))

OnSendingCompleted(client, m_SocketEventArgSend);

}

catch (Exception e)

{

LogError(e);

ClearPrevSendState(m_SocketEventArgSend);

OnSendError(queue, CloseReason.SocketError);

}

}

public void ProcessReceive(SocketAsyncEventArgs e)

{

var state = e.UserToken as SaeState;

if (!ProcessCompleted(e))

{

e.UserToken = null;

m_SaePoolForReceive.Return(state);

OnReceiveError(CloseReason.ClientClosing);

return;

}

OnReceiveEnded();

var result = ProcessReceivedData(new ArraySegment<byte>(e.Buffer, e.Offset, e.BytesTransferred), state);

if (result.State == ProcessState.Cached)

{

e.UserToken = null;

var newState = m_SaePoolForReceive.Get();

e = newState.Sae;

e.UserToken = newState;

newState.SocketSession = this;

}

//read the next block of data sent from the client

StartReceive(e);

}

public override void ApplySecureProtocol()

{

//TODO: Implement async socket SSL/TLS encryption

}

protected override void OnClosed(CloseReason reason)

{

var sae = m_SocketEventArgSend;

if (sae == null)

{

base.OnClosed(reason);

return;

}

if (Interlocked.CompareExchange(ref m_SocketEventArgSend, null, sae) == sae)

{

sae.Dispose();

base.OnClosed(reason);

}

}

protected override void ReturnBuffer(IList<KeyValuePair<ArraySegment<byte>, IBufferState>> buffers, int offset, int length)

{

for (var i = 0; i < length; i++)

{

var buffer = buffers[offset + i];

var state = buffer.Value as SaeState;

if (state != null && state.DecreaseReference() == 0)

{

m_SaePoolForReceive.Return(state);

}

}

}

}

}