/// <summary>
/// 判断是否存在到服务器的连接
/// </summary>
/// <returns></returns>
public static bool ExistConnection()
{
//Use IPAddress.Any to match all IPAddresses. Use port number 0 to match all port numbers.
IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, 0);
return(NetworkComms.ConnectionExists(new IPEndPoint(IPAddress.Parse(serverIp), serverPort), localEndPoint, ConnectionType.TCP));
}
/// <inheritdoc />
protected override void StartIncomingDataListen()
{
if (!NetworkComms.ConnectionExists(ConnectionInfo.RemoteEndPoint, ConnectionInfo.LocalEndPoint, ConnectionType.Bluetooth, ConnectionInfo.ApplicationLayerProtocol))
{
CloseConnection(true, 18);
throw new ConnectionSetupException("A connection reference by endPoint should exist before starting an incoming data listener.");
}
lock (SyncRoot)
{
if (NetworkComms.ConnectionListenModeUseSync)
{
if (incomingDataListenThread == null)
{
incomingDataListenThread = new Thread(IncomingBluetoothDataSyncWorker);
//Incoming data always gets handled in a time critical fashion
incomingDataListenThread.Priority = NetworkComms.timeCriticalThreadPriority;
incomingDataListenThread.Name = "BT_IncomingDataListener";
incomingDataListenThread.IsBackground = true;
incomingDataListenThread.Start();
}
}
else
{
btClientNetworkStream.BeginRead(dataBuffer, 0, dataBuffer.Length, new AsyncCallback(IncomingBluetoothPacketHandler), btClientNetworkStream);
}
}
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Listening for incoming data from " + ConnectionInfo);
}
}
/// <inheritdoc />
protected override void StartIncomingDataListen()
{
if (!NetworkComms.ConnectionExists(ConnectionInfo.RemoteIPEndPoint, ConnectionInfo.LocalIPEndPoint, ConnectionType.TCP, ConnectionInfo.ApplicationLayerProtocol))
{
CloseConnection(true, 18);
throw new ConnectionSetupException("A connection reference by endPoint should exist before starting an incoming data listener.");
}
#if WINDOWS_PHONE
var stream = socket.InputStream.AsStreamForRead();
stream.BeginRead(dataBuffer, 0, dataBuffer.Length, new AsyncCallback(IncomingTCPPacketHandler), stream);
#elif NETFX_CORE
Task readTask = new Task(async() =>
{
var buffer = Windows.Security.Cryptography.CryptographicBuffer.CreateFromByteArray(dataBuffer);
var readBuffer = await socket.InputStream.ReadAsync(buffer, buffer.Capacity, InputStreamOptions.Partial);
await IncomingTCPPacketHandler(readBuffer);
});
readTask.Start();
#else
lock (SyncRoot)
{
if (NetworkComms.ConnectionListenModeUseSync)
{
if (incomingDataListenThread == null)
{
incomingDataListenThread = new Thread(IncomingTCPDataSyncWorker);
//Incoming data always gets handled in a time critical fashion
incomingDataListenThread.Priority = NetworkComms.timeCriticalThreadPriority;
incomingDataListenThread.Name = "UDP_IncomingDataListener";
incomingDataListenThread.IsBackground = true;
incomingDataListenThread.Start();
}
}
else
{
if (asyncListenStarted)
{
throw new ConnectionSetupException("Async listen already started. Why has this been called twice?.");
}
asyncListenerInRead = true;
connectionStream.BeginRead(dataBuffer, 0, dataBuffer.Length, new AsyncCallback(IncomingTCPPacketHandler), connectionStream);
asyncListenStarted = true;
}
}
#endif
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Listening for incoming data from " + ConnectionInfo);
}
}
/// <summary>
/// Create a new connection object
/// </summary>
/// <param name="connectionInfo">ConnecitonInfo corresponding to the new connection</param>
/// <param name="defaultSendReceiveOptions">The SendReceiveOptions which should be used as connection defaults</param>
protected Connection(ConnectionInfo connectionInfo, SendReceiveOptions defaultSendReceiveOptions)
{
SendTimesMSPerKBCache = new CommsMath();
dataBuffer = new byte[NetworkComms.ReceiveBufferSizeBytes];
packetBuilder = new PacketBuilder();
//Intialise the sequence counter using the global value
//Subsequent values on this connection are guaranteed to be sequential
packetSequenceCounter = Interlocked.Increment(ref NetworkComms.totalPacketSendCount);
ConnectionInfo = connectionInfo;
if (defaultSendReceiveOptions != null)
{
ConnectionDefaultSendReceiveOptions = defaultSendReceiveOptions;
}
else
{
ConnectionDefaultSendReceiveOptions = NetworkComms.DefaultSendReceiveOptions;
}
if (NetworkComms.commsShutdown)
{
throw new ConnectionSetupException("Attempting to create new connection after global comms shutdown has been initiated.");
}
if (ConnectionInfo.ConnectionType == ConnectionType.Undefined || ConnectionInfo.RemoteEndPoint == null)
{
throw new ConnectionSetupException("ConnectionType and RemoteEndPoint must be defined within provided ConnectionInfo.");
}
//If a connection already exists with this info then we can throw an exception here to prevent duplicates
if (NetworkComms.ConnectionExists(connectionInfo.RemoteEndPoint, connectionInfo.ConnectionType))
{
throw new ConnectionSetupException("A connection already exists with " + ConnectionInfo);
}
//We add a reference in the constructor to ensure any duplicate connection problems are picked up here
NetworkComms.AddConnectionByReferenceEndPoint(this);
}
/// <summary>
/// Starts listening for incoming data on this TCP connection
/// </summary>
protected override void StartIncomingDataListen()
{
if (!NetworkComms.ConnectionExists(ConnectionInfo.RemoteEndPoint, ConnectionType.TCP))
{
CloseConnection(true, 18);
throw new ConnectionSetupException("A connection reference by endPoint should exist before starting an incoming data listener.");
}
#if WINDOWS_PHONE
var stream = socket.InputStream.AsStreamForRead();
stream.BeginRead(dataBuffer, 0, dataBuffer.Length, new AsyncCallback(IncomingTCPPacketHandler), stream);
#else
lock (delegateLocker)
{
if (NetworkComms.ConnectionListenModeUseSync)
{
if (incomingDataListenThread == null)
{
incomingDataListenThread = new Thread(IncomingTCPDataSyncWorker);
//Incoming data always gets handled in a time critical fashion
incomingDataListenThread.Priority = NetworkComms.timeCriticalThreadPriority;
incomingDataListenThread.Name = "IncomingDataListener";
incomingDataListenThread.Start();
}
}
else
{
tcpClientNetworkStream.BeginRead(dataBuffer, 0, dataBuffer.Length, new AsyncCallback(IncomingTCPPacketHandler), tcpClientNetworkStream);
}
}
#endif
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Listening for incoming data from " + ConnectionInfo);
}
}
/// <summary>
/// Create a new connection object
/// </summary>
/// <param name="connectionInfo">ConnectionInfo corresponding to the new connection</param>
/// <param name="defaultSendReceiveOptions">The SendReceiveOptions which should be used as connection defaults</param>
protected Connection(ConnectionInfo connectionInfo, SendReceiveOptions defaultSendReceiveOptions)
{
//If the application layer protocol is disabled the serialiser must be NullSerializer
//and no data processors are allowed.
if (connectionInfo.ApplicationLayerProtocol == ApplicationLayerProtocolStatus.Disabled)
{
if (defaultSendReceiveOptions.Options.ContainsKey("ReceiveConfirmationRequired"))
{
throw new ArgumentException("Attempted to create an unmanaged connection when the provided send receive" +
" options specified the ReceiveConfirmationRequired option. Please provide compatible send receive options in order to successfully" +
" instantiate this unmanaged connection.", "defaultSendReceiveOptions");
}
if (defaultSendReceiveOptions.DataSerializer != DPSManager.GetDataSerializer <NullSerializer>())
{
throw new ArgumentException("Attempted to create an unmanaged connection when the provided send receive" +
" options serialiser was not NullSerializer. Please provide compatible send receive options in order to successfully" +
" instantiate this unmanaged connection.", "defaultSendReceiveOptions");
}
if (defaultSendReceiveOptions.DataProcessors.Count > 0)
{
throw new ArgumentException("Attempted to create an unmanaged connection when the provided send receive" +
" options contains data processors. Data processors may not be used with unmanaged connections." +
" Please provide compatible send receive options in order to successfully instantiate this unmanaged connection.", "defaultSendReceiveOptions");
}
}
SendTimesMSPerKBCache = new CommsMath();
packetBuilder = new PacketBuilder();
//Initialise the sequence counter using the global value
//Subsequent values on this connection are guaranteed to be sequential
packetSequenceCounter = Interlocked.Increment(ref NetworkComms.totalPacketSendCount);
ConnectionInfo = connectionInfo;
if (defaultSendReceiveOptions != null)
{
ConnectionDefaultSendReceiveOptions = defaultSendReceiveOptions;
}
else
{
ConnectionDefaultSendReceiveOptions = NetworkComms.DefaultSendReceiveOptions;
}
//Add any listener specific packet handlers if required
if (connectionInfo.ConnectionListener != null)
{
connectionInfo.ConnectionListener.AddListenerPacketHandlersToConnection(this);
}
if (NetworkComms.commsShutdown)
{
throw new ConnectionSetupException("Attempting to create new connection after global NetworkComms.Net shutdown has been initiated.");
}
if (ConnectionInfo.ConnectionType == ConnectionType.Undefined || ConnectionInfo.RemoteEndPoint == null)
{
throw new ConnectionSetupException("ConnectionType and RemoteEndPoint must be defined within provided ConnectionInfo.");
}
//If a connection already exists with this info then we can throw an exception here to prevent duplicates
if (NetworkComms.ConnectionExists(connectionInfo.RemoteEndPoint, connectionInfo.LocalEndPoint, connectionInfo.ConnectionType, connectionInfo.ApplicationLayerProtocol))
{
throw new ConnectionSetupException("A " + connectionInfo.ConnectionType.ToString() + " connection already exists with info " + connectionInfo);
}
//We add a reference in the constructor to ensure any duplicate connection problems are picked up here
NetworkComms.AddConnectionReferenceByRemoteEndPoint(this);
}
/// <summary>
/// Internal UDP creation method that performs the necessary tasks
/// </summary>
/// <param name="connectionInfo"></param>
/// <param name="defaultSendReceiveOptions"></param>
/// <param name="level"></param>
/// <param name="listenForReturnPackets"></param>
/// <param name="existingConnection"></param>
/// <returns></returns>
internal static UDPConnection GetConnection(ConnectionInfo connectionInfo, SendReceiveOptions defaultSendReceiveOptions, UDPOptions level, bool listenForReturnPackets, UDPConnection existingConnection)
{
connectionInfo.ConnectionType = ConnectionType.UDP;
UDPConnection connection = null;
lock (NetworkComms.globalDictAndDelegateLocker)
{
if (NetworkComms.ConnectionExists(connectionInfo.RemoteEndPoint, ConnectionType.UDP))
{
connection = (UDPConnection)NetworkComms.GetExistingConnection(connectionInfo.RemoteEndPoint, ConnectionType.UDP);
}
else
{
//If we are listening on what will be the outgoing adaptor we send with that client to ensure if our connection info is handed off we are connectable by others
if (existingConnection == null)
{
try
{
IPEndPoint localEndPoint = NetworkComms.BestLocalEndPoint(connectionInfo.RemoteEndPoint);
lock (udpClientListenerLocker)
{
IPEndPoint existingLocalEndPoint = ExistingLocalListenEndPoints(localEndPoint.Address);
if (existingLocalEndPoint != null)
{
existingConnection = udpConnectionListeners[existingLocalEndPoint];
//If we are using an existing listener there is no need to listen for packets
listenForReturnPackets = false;
}
}
}
catch (Exception)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Failed to determine preferred existing udpClientListener to " + connectionInfo.RemoteEndPoint.Address + ":" + connectionInfo.RemoteEndPoint.Port.ToString() + ". Will create an isolated udp connection instead.");
}
}
}
//If an existing connection does not exist but the info we are using suggests it should we need to reset the info
//so that it can be reused correctly. This case generally happens when using Comms in the format
//UDPConnection.GetConnection(info).SendObject(packetType, objToSend);
if (connectionInfo.ConnectionState == ConnectionState.Established || connectionInfo.ConnectionState == ConnectionState.Shutdown)
{
connectionInfo.ResetConnectionInfo();
}
connection = new UDPConnection(connectionInfo, defaultSendReceiveOptions, level, listenForReturnPackets, existingConnection);
}
}
if (!NetworkComms.commsShutdown)
{
TriggerConnectionKeepAliveThread();
}
return(connection);
}
internal static TCPConnection GetConnection(ConnectionInfo connectionInfo, SendReceiveOptions defaultSendReceiveOptions, TcpClient tcpClient, bool establishIfRequired = true)
#endif
{
connectionInfo.ConnectionType = ConnectionType.TCP;
//If we have a tcpClient at this stage we must be serverside
#if WINDOWS_PHONE
if (socket != null)
{
connectionInfo.ServerSide = true;
}
#else
if (tcpClient != null)
{
connectionInfo.ServerSide = true;
}
#endif
bool newConnection = false;
TCPConnection connection;
lock (NetworkComms.globalDictAndDelegateLocker)
{
//Check to see if a conneciton already exists, if it does return that connection, if not return a new one
if (NetworkComms.ConnectionExists(connectionInfo.RemoteEndPoint, connectionInfo.ConnectionType))
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Attempted to create new TCPConnection to connectionInfo='" + connectionInfo + "' but there is an existing connection. Existing connection will be returned instead.");
}
establishIfRequired = false;
connection = (TCPConnection)NetworkComms.GetExistingConnection(connectionInfo.RemoteEndPoint, connectionInfo.ConnectionType);
}
else
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Creating new TCPConnection to connectionInfo='" + connectionInfo + "'." + (establishIfRequired ? " Connection will be established." : " Connection will not be established."));
}
if (connectionInfo.ConnectionState == ConnectionState.Establishing)
{
throw new ConnectionSetupException("Connection state for connection " + connectionInfo + " is marked as establishing. This should only be the case here due to a bug.");
}
//If an existing connection does not exist but the info we are using suggests it should we need to reset the info
//so that it can be reused correctly. This case generally happens when using Comms in the format
//TCPConnection.GetConnection(info).SendObject(packetType, objToSend);
if (connectionInfo.ConnectionState == ConnectionState.Established || connectionInfo.ConnectionState == ConnectionState.Shutdown)
{
connectionInfo.ResetConnectionInfo();
}
//We add a reference to networkComms for this connection within the constructor
#if WINDOWS_PHONE
connection = new TCPConnection(connectionInfo, defaultSendReceiveOptions, socket);
#else
connection = new TCPConnection(connectionInfo, defaultSendReceiveOptions, tcpClient);
#endif
newConnection = true;
}
}
if (newConnection && establishIfRequired)
{
connection.EstablishConnection();
}
else if (!newConnection)
{
connection.WaitForConnectionEstablish(NetworkComms.ConnectionEstablishTimeoutMS);
}
if (!NetworkComms.commsShutdown)
{
TriggerConnectionKeepAliveThread();
}
return(connection);
}
