/// <summary>
/// 当一个SocketAsyncEventArgs断开后，我们需要断开对应的Socket连接，并释放对应资源
/// </summary>
/// <param name="userToken"></param>
public void CloseSocket(AsyncSocketUserToken userToken)
{
if (userToken.ConnectSocket == null)
{
return;
}
Interlocked.Decrement(ref ConnectionCount);
string socketInfo = string.Format("Local Address: {0} Remote Address: {1}", userToken.ConnectSocket.LocalEndPoint,
userToken.ConnectSocket.RemoteEndPoint);
LogHelper.Info(string.Format("Client connection disconnected. {0}", socketInfo));
if (this.ReceivedMinerConnectionAction != null)
{
this.ReceivedMinerConnectionAction(userToken, true);
}
try
{
userToken.ConnectSocket.Shutdown(SocketShutdown.Both);
}
catch (Exception E)
{
LogHelper.Error(string.Format("CloseClientSocket Disconnect client {0} error, message: {1}", socketInfo, E.Message));
}
userToken.ConnectSocket.Close();
userToken.ConnectSocket = null; //释放引用，并清理缓存，包括释放协议对象等资源
m_maxNumberAcceptedClients.Release();
m_asyncSocketUserTokenPool.Push(userToken);
m_asyncSocketUserTokenList.Remove(userToken);
}
/// <summary>
/// NET底层IO线程也是每个异步事件都是由不同的线程返回到Completed事件，
/// 因此在Completed事件需要对用户对象进行加锁，
/// 避免同一个用户对象同时触发两个Completed事件。
/// </summary>
/// <param name="sender"></param>
/// <param name="asyncEventArgs"></param>
void IO_Completed(object sender, SocketAsyncEventArgs asyncEventArgs)
{
AsyncSocketUserToken userToken = asyncEventArgs.UserToken as AsyncSocketUserToken;
userToken.ActiveDateTime = DateTime.Now;
try
{
lock (userToken)
{//避免同一个userToken同时有多个线程操作
if (asyncEventArgs.LastOperation == SocketAsyncOperation.Receive)
{
ProcessReceive(asyncEventArgs);
}
else if (asyncEventArgs.LastOperation == SocketAsyncOperation.Send)
{
ProcessSend(asyncEventArgs);
}
else
{
throw new ArgumentException("The last operation completed on the socket was not a receive or send");
}
}
}
catch (Exception E)
{
LogHelper.Error(string.Format("IO_Completed {0} error, message: {1}", userToken.ConnectSocket, E.Message));
LogHelper.Error(E.StackTrace);
}
}
public void Remove(AsyncSocketUserToken userToken)
{
lock (m_list)
{
m_list.Remove(userToken);
}
}
public void Add(AsyncSocketUserToken userToken)
{
lock (m_list)
{
m_list.Add(userToken);
}
}
public void CopyList(ref AsyncSocketUserToken[] array)
{
lock (m_list)
{
array = new AsyncSocketUserToken[m_list.Count];
m_list.CopyTo(array);
}
}
/// <summary>
///
/// </summary>
/// <param name="item"></param>
public void Push(AsyncSocketUserToken item)
{
if (item == null)
{
throw new ArgumentException("Items added to a AsyncSocketUserToken cannot be null");
}
lock (m_pool)
{//对m_asyncSocketUserTokenPool和m_asyncSocketUserTokenList进行处理的时候都有加锁
m_pool.Push(item);
}
}
public AsyncSocketInvokeElement(AsyncSocketServer asyncSocketServer, AsyncSocketUserToken asyncSocketUserToken)
{
m_asyncSocketServer = asyncSocketServer;
m_asyncSocketUserToken = asyncSocketUserToken;
m_netByteOrder = false;
m_sendAsync = false;
m_connectDT = DateTime.UtcNow;
m_activeDT = DateTime.UtcNow;
}
/// <summary>
/// 按照连接数建立读写对象
/// </summary>
public void Init()
{
AsyncSocketUserToken userToken;
for (int i = 0; i < m_numConnections; i++)
{
userToken = new AsyncSocketUserToken(m_receiveBufferSize);
userToken.ReceiveEventArgs.Completed += new EventHandler <SocketAsyncEventArgs>(IO_Completed);
userToken.SendEventArgs.Completed += new EventHandler <SocketAsyncEventArgs>(IO_Completed);
m_asyncSocketUserTokenPool.Push(userToken);
}
}
public void SendCommand(AsyncSocketUserToken token, PoolCommand command)
{
try
{
var buffer = command.GetBytes();
this.SendAsyncEvent(token.ConnectSocket, token.SendEventArgs, buffer, 0, buffer.Length);
}
catch (Exception ex)
{
LogHelper.Error(ex.Message, ex);
this.CloseSocket(token);
}
}
/// <summary>
/// 发送事件响应函数,发送的逻辑,把发送数据放到一个列表中，当上一个发送事件完成响应Completed事件，
/// 这时我们需要检测发送队列中是否存在未发送的数据，如果存在则继续发送
/// </summary>
/// <param name="sendEventArgs"></param>
/// <returns></returns>
private bool ProcessSend(SocketAsyncEventArgs sendEventArgs)
{
AsyncSocketUserToken userToken = sendEventArgs.UserToken as AsyncSocketUserToken;
userToken.ActiveDateTime = DateTime.Now;
if (sendEventArgs.SocketError == SocketError.Success)
{
return(true);
}
else
{
CloseSocket(userToken);
return(false);
}
}
private void ProcessAccept(SocketAsyncEventArgs acceptEventArgs)
{
LogHelper.Info(string.Format("Client connection accepted. Local Address: {0}, Remote Address: {1}",
acceptEventArgs.AcceptSocket.LocalEndPoint, acceptEventArgs.AcceptSocket.RemoteEndPoint));
Interlocked.Increment(ref ConnectionCount);
AsyncSocketUserToken userToken = m_asyncSocketUserTokenPool.Pop();
m_asyncSocketUserTokenList.Add(userToken); //添加到正在连接列表
userToken.ConnectSocket = acceptEventArgs.AcceptSocket;
userToken.ConnectDateTime = DateTime.Now;
userToken.Address = acceptEventArgs.AcceptSocket.RemoteEndPoint.ToString();
if (this.ReceivedMinerConnectionAction != null)
{
this.ReceivedMinerConnectionAction(userToken, true);
}
try
{
bool willRaiseEvent = userToken.ConnectSocket.ReceiveAsync(userToken.ReceiveEventArgs); //投递接收请求
if (!willRaiseEvent)
{
lock (userToken)
{
ProcessReceive(userToken.ReceiveEventArgs);
}
}
}
catch (Exception E)
{
LogHelper.Error(string.Format("Accept client {0} error, message: {1}", userToken.ConnectSocket, E.Message));
LogHelper.Error(E.StackTrace);
}
StartAccept(acceptEventArgs); //把当前异步事件释放，等待下次连接
}
/// <summary>
/// 接收事件响应函数,接收的逻辑
/// </summary>
/// <param name="receiveEventArgs"></param>
private void ProcessReceive(SocketAsyncEventArgs receiveEventArgs)
{
AsyncSocketUserToken userToken = receiveEventArgs.UserToken as AsyncSocketUserToken;
if (userToken.ConnectSocket == null)
{
return;
}
userToken.ActiveDateTime = DateTime.Now;
if (userToken.ReceiveEventArgs.BytesTransferred > 0 && userToken.ReceiveEventArgs.SocketError == SocketError.Success)
{
HeartbeatCommand.UpdateHeartTime(userToken);
int offset = userToken.ReceiveEventArgs.Offset;
int count = userToken.ReceiveEventArgs.BytesTransferred;
if (count > 0) //处理接收数据
{
var buffer = userToken.ReceiveEventArgs.Buffer;
var commandDataList = new List <byte[]>();
var index = 0;
List <byte> bytes = null;
while (index < buffer.Length)
{
if (bytes == null)
{
if ((index + 3) < buffer.Length &&
buffer[index] == PoolCommand.DefaultPrefixBytes[0] &&
buffer[index + 1] == PoolCommand.DefaultPrefixBytes[1] &&
buffer[index + 2] == PoolCommand.DefaultPrefixBytes[2] &&
buffer[index + 3] == PoolCommand.DefaultPrefixBytes[3])
{
bytes = new List <byte>();
bytes.AddRange(PoolCommand.DefaultPrefixBytes);
index += 4;
}
else
{
index++;
}
}
else
{
if ((index + 3) < buffer.Length &&
buffer[index] == PoolCommand.DefaultSuffixBytes[0] &&
buffer[index + 1] == PoolCommand.DefaultSuffixBytes[1] &&
buffer[index + 2] == PoolCommand.DefaultSuffixBytes[2] &&
buffer[index + 3] == PoolCommand.DefaultSuffixBytes[3])
{
bytes.AddRange(PoolCommand.DefaultSuffixBytes);
commandDataList.Add(bytes.ToArray());
bytes = null;
index += 4;
}
else
{
bytes.Add(buffer[index]);
index++;
}
}
}
if (this.ReceivedCommandAction != null)
{
foreach (var data in commandDataList)
{
try
{
var cmd = PoolCommand.ConvertBytesToMessage(data);
if (cmd != null)
{
this.ReceivedCommandAction(userToken, cmd);
}
}
catch (Exception ex)
{
LogHelper.Warn($"Error Data from {userToken.Address}：{Base16.Encode(data)}");
LogHelper.Error("Error occured on deserialize messgae: " + ex.Message, ex);
}
}
}
if (userToken.ConnectSocket == null || userToken.ReceiveEventArgs == null)
{
return;
}
bool willRaiseEvent = userToken.ConnectSocket.ReceiveAsync(userToken.ReceiveEventArgs); //投递接收请求
if (!willRaiseEvent)
{
ProcessReceive(userToken.ReceiveEventArgs);
}
}
else
{
CloseSocket(userToken);
}
}
}
