SmartDoorLock_G3/Team.Communicate/Server/TcpServer.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using DotNetty.Buffers;
using DotNetty.Codecs;
using Team.Communicate.EventArg;
using Team.Communicate.State;
using Team.Utility;

namespace Team.Communicate.Server
{
    /// <summary>
    /// TcpServer
    /// </summary>
    public sealed class TeamTcpServer : ITeamTcpServer
    {
        #region Fields

        /// <summary>
        /// 服务器使用的异步TcpListener
        /// </summary>
        private TcpListener _listener;

        /// <summary>
        /// 客户端会话列表
        /// </summary>
        private readonly List<TcpClientState> _clients;

        private bool _disposed;

        #endregion

        #region Properties

        public IByteBuffer[] EndWith { get; set; } = Delimiters.LineDelimiter();
        /// <summary>
        /// 服务器是否正在运行
        /// </summary>
        public bool IsRunning { get; private set; }

        /// <summary>
        /// 监听的IP地址
        /// </summary>
        public IPAddress Address { get; private set; }

        /// <summary>
        /// 监听的端口
        /// </summary>
        public int Port { get; }

        public Encoding Encoding { get;set; } = Encoding.UTF8;

        #endregion

        #region 构造函数

        /// <inheritdoc />
        /// <summary>
        /// 异步TCP服务器
        /// </summary>
        /// <param name="listenPort">监听的端口</param>
        public TeamTcpServer(int listenPort)
            : this(IPAddress.Any, listenPort)
        {
        }

        /// <inheritdoc />
        /// <summary>
        /// 异步TCP服务器
        /// </summary>
        /// <param name="localEp">监听的终结点</param>
        public TeamTcpServer(IPEndPoint localEp)
            : this(localEp.Address, localEp.Port)
        {
        }

        /// <summary>
        /// 异步TCP服务器
        /// </summary>
        /// <param name="localIpAddress">监听的IP地址</param>
        /// <param name="listenPort">监听的端口</param>
        private TeamTcpServer(IPAddress localIpAddress, int listenPort)
        {
            Address = localIpAddress;
            Port = listenPort;
            Encoding = Encoding.UTF8;
            _clients = new List<TcpClientState>();
            _listener = new TcpListener(Address, Port);
            _listener.AllowNatTraversal(true);
        }

        #endregion

        #region Method

        /// <inheritdoc />
        /// <summary>
        /// 启动服务器
        /// </summary>
        public void Start()
        {
            if (IsRunning) return;
            IsRunning = true;
            _listener.Start();
            _listener.BeginAcceptTcpClient(
                HandleTcpClientAccepted, _listener);
        }


        /// <inheritdoc />
        /// <summary>
        /// 启动服务器
        /// </summary>
        /// <param name="backlog">
        /// 服务器所允许的挂起连接序列的最大长度
        /// </param>
        public void Start(int backlog)
        {
            if (IsRunning) return;
            IsRunning = true;
            _listener.Start(backlog);
            //_listener.BeginAcceptTcpClient(
            //    HandleTcpClientAccepted, _listener);
            new Thread(async () =>
            {
                while (true)
                {
                    var client = await _listener.AcceptTcpClientAsync();
                    
                    var buffer = new byte[client.ReceiveBufferSize];
                    var state
                        = new TcpClientState(client, buffer);
                    _clients.Add(state);

                    var thread = new Thread(NetWorkMethod);
                    thread.Start(state);
                    if (!IsRunning)
                    {
                        break;
                    }
                }
            })
            {
                IsBackground = true
            }.Start();

        }

        private async void NetWorkMethod(object client)
        {
            if (client is TcpClientState tcpClientState)
            {
                var buffer = new byte[1024];
                var length= await tcpClientState.NetworkStream.ReadAsync(buffer,0,buffer.Length);
            }

        }

        /// <inheritdoc />
        /// <summary>
        /// 停止服务器
        /// </summary>
        public void Stop()
        {
            if (!IsRunning) return;
            IsRunning = false;
            _listener.Stop();
            lock (_clients)
            {
                //关闭所有客户端连接
                CloseAllClient();
            }
        }

        /// <summary>
        /// 处理客户端连接的函数
        /// </summary>
        /// <param name="ar"></param>
        private void HandleTcpClientAccepted(IAsyncResult ar)
        {
            if (!IsRunning) return;
            var client = _listener.EndAcceptTcpClient(ar);
            var buffer = new byte[client.ReceiveBufferSize];
            var state
                = new TcpClientState(client, buffer);
            lock (_clients)
            {
                _clients.Add(state);
                RaiseClientConnected(state);
            }

            var stream = state.NetworkStream;
            //开始异步读取数据
            stream.BeginRead(state.Buffer, 0, state.Buffer.Length, HandleDataReceived, state);

            _listener.BeginAcceptTcpClient(
                HandleTcpClientAccepted, ar.AsyncState);
        }

        /// <summary>
        /// 数据接受回调函数
        /// </summary>
        /// <param name="ar"></param>
        private void HandleDataReceived(IAsyncResult ar)
        {
            if (!IsRunning) return;
            var state = (TcpClientState) ar.AsyncState;
            var stream = state.NetworkStream;

            int rec;
            try
            {
                rec = stream.EndRead(ar);
            }
            catch (Exception e)
            {
                LogUtil.WriteInfo("server 发生异常:" + e);
                rec = 0;
            }

            if (rec == 0)
            {
                // connection has been closed
                lock (_clients)
                {
                    _clients.Remove(state);
                    //触发客户端连接断开事件
                    RaiseClientDisconnected();
                    return;
                }
            }

            // received byte and trigger event notification
            var buff = new byte[rec];
            Buffer.BlockCopy(state.Buffer, 0, buff, 0, rec);
            state.Memory = new MemoryStream();
            state.Memory.Write(buff, 0, buff.Length);
            //state.Buffer = buff;
            //触发数据收到事件
            try
            {
                RaiseDataReceived(state);
            }
            catch (Exception)
            {
                lock (_clients)
                {
                    _clients.Remove(state);
                    //触发客户端连接断开事件
                    RaiseClientDisconnected();
                    return;
                }
            }


            // continue listening for tcp diagram packets
            stream.BeginRead(state.Buffer, 0, state.Buffer.Length, HandleDataReceived, state);
        }

        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="state">接收数据的客户端会话</param>
        /// <param name="data">数据报文</param>
        public void Send(TcpClientState state, byte[] data)
        {
            RaisePrepareSend(state);
            Send(state.TcpClient, data);
        }
        /// <summary>
        /// 异步发送数据
        /// </summary>
        /// <param name="state">接收数据的客户端会话</param>
        /// <param name="data">数据报文</param>
        public Task SendAsync(TcpClientState state, byte[] data)
        {
            RaisePrepareSend(state);
            return SendAsync(state.TcpClient, data);
        }

        /// <summary>
        /// 指定IP地址发送数据
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="data"></param>
        public void Send(string ip, byte[] data)
        {
            var tcpClient = _clients.Find(p => p.TcpClient.Client.RemoteEndPoint.ToString() == ip);
            RaisePrepareSend(tcpClient);
            if (!IsRunning)
                throw new InvalidProgramException("This TCP Socket server has not been started.");

            if (ip == null)
                throw new ArgumentNullException(nameof(ip));

            if (data == null)
                throw new ArgumentNullException(nameof(data));
            tcpClient.TcpClient.GetStream().BeginWrite(data, 0, data.Length, SendDataEnd, tcpClient.TcpClient);
        }
        /// <summary>
        /// 指定IP地址异步发送数据
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="data"></param>
        public Task SendAsync(string ip, byte[] data)
        {
            var tcpClient = _clients.Find(p => p.TcpClient.Client.RemoteEndPoint.ToString() == ip);
            if (tcpClient==null)
            {
                return Task.CompletedTask;
            }
            RaisePrepareSend(tcpClient);
            if (!IsRunning)
                throw new InvalidProgramException("This TCP Socket server has not been started.");

            if (ip == null)
                throw new ArgumentNullException(nameof(ip));

            if (data == null)
                throw new ArgumentNullException(nameof(data));
            var stream = tcpClient.TcpClient.GetStream();
            return stream.WriteAsync(data, 0, data.Length);
        }

        /// <summary>
        /// 异步发送数据至指定的客户端
        /// </summary>
        /// <param name="client">客户端</param>
        /// <param name="data">报文</param>
        public void Send(TcpClient client, byte[] data)
        {
            if (!IsRunning)
                throw new InvalidProgramException("This TCP Socket server has not been started.");

            if (client == null)
                throw new ArgumentNullException(nameof(client));

            if (data == null)
                throw new ArgumentNullException(nameof(data));
            client.GetStream().BeginWrite(data, 0, data.Length, SendDataEnd, client);
        }
        /// <summary>
        /// 异步发送数据至指定的客户端
        /// </summary>
        /// <param name="client">客户端</param>
        /// <param name="data">报文</param>
        public Task SendAsync(TcpClient client, byte[] data)
        {
            if (!IsRunning)
                throw new InvalidProgramException("This TCP Socket server has not been started.");

            if (client == null)
                throw new ArgumentNullException(nameof(client));

            if (data == null)
                throw new ArgumentNullException(nameof(data));
            var stream = client.GetStream();
            return stream.WriteAsync(data, 0, data.Length);
        }

        /// <summary>
        /// 发送数据完成处理函数
        /// </summary>
        /// <param name="ar">目标客户端Socket</param>
        private void SendDataEnd(IAsyncResult ar)
        {
            ((TcpClient) ar.AsyncState).GetStream().EndWrite(ar);
            RaiseCompletedSend(null);
        }
        /// <summary>
        /// 广播发送数据
        /// </summary>
        /// <param name="msg">消息内容</param>
        public void BroadToClient(string msg)
        {
            foreach (var client in _clients)
            {
                var bytes = Encoding.GetBytes(msg);
                Send(client, bytes);
            }
        }

        public async Task BroadToClientAsync(string msg)
        {
            foreach (var client in _clients)
            {
                var bytes = Encoding.GetBytes(msg);
                 await SendAsync(client, bytes);
            }
        }

        #endregion

        #region 事件

        /// <summary>
        /// 与客户端的连接已建立事件
        /// </summary>
        public event EventHandler<ServerEventArgs> ClientConnected;

        /// <summary>
        /// 与客户端的连接已断开事件
        /// </summary>
        public event EventHandler<ServerEventArgs> ClientDisconnected;


        /// <summary>
        /// 触发客户端连接事件
        /// </summary>
        /// <param name="state"></param>
        private void RaiseClientConnected(TcpClientState state)
        {
            ClientConnected?.Invoke(this, new ServerEventArgs(state));
        }

        /// <summary>
        /// 触发客户端连接断开事件
        /// </summary>
        private void RaiseClientDisconnected()
        {
            ClientDisconnected?.Invoke(this, new ServerEventArgs("连接断开"));
        }

        /// <inheritdoc />
        /// <summary>
        /// 接收到数据事件
        /// </summary>
        public event EventHandler<ServerEventArgs> DataReceived;

        private void RaiseDataReceived(TcpClientState state)
        {
            DataReceived?.BeginInvoke(this, new ServerEventArgs(state), _ =>
            {
                
            } ,null);
        }

        /// <summary>
        /// 发送数据前的事件
        /// </summary>
        public event EventHandler<ServerEventArgs> PrepareSend;

        /// <summary>
        /// 触发发送数据前的事件
        /// </summary>
        /// <param name="state"></param>
        private void RaisePrepareSend(TcpClientState state)
        {
            PrepareSend?.Invoke(this, new ServerEventArgs(state));
        }

        /// <summary>
        /// 数据发送完毕事件
        /// </summary>
        public event EventHandler<ServerEventArgs> CompletedSend;

        /// <summary>
        /// 触发数据发送完毕的事件
        /// </summary>
        /// <param name="state"></param>
        private void RaiseCompletedSend(TcpClientState state)
        {
            CompletedSend?.Invoke(this, new ServerEventArgs(state));
        }

        /// <summary>
        /// 网络错误事件
        /// </summary>
        public event EventHandler<ServerEventArgs> NetError;

        /// <summary>
        /// 异常事件
        /// </summary>
        public event EventHandler<ServerEventArgs> OtherException;

        /// <summary>
        /// 触发异常事件
        /// </summary>
        /// <param name="state"></param>
        /// <param name="description"></param>
        private void RaiseOtherException(TcpClientState state, string description = "unknown exception")
        {
            OtherException?.Invoke(this, new ServerEventArgs(description, state));
        }

        #endregion

        #region Close

        /// <inheritdoc />
        /// <summary>
        /// 关闭一个与客户端之间的会话
        /// </summary>
        /// <param name="state">需要关闭的客户端会话对象</param>
        public void Close(TcpClientState state)
        {
            if (state == null) return;
            state.Close();
            _clients.Remove(state);
        }

        /// <inheritdoc />
        /// <summary>
        /// 关闭所有的客户端会话,与所有的客户端连接会断开
        /// </summary>
        public void CloseAllClient()
        {
            foreach (var client in _clients)
            {
                client?.Close();
            }

            _clients.Clear();
        }

        #endregion

        #region 释放

        /// <inheritdoc>
        ///     <cref></cref>
        /// </inheritdoc>
        /// <summary>
        /// Performs application-defined tasks associated with freeing, 
        /// releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        ~TeamTcpServer()
        {
            Dispose();
        }

        /// <summary>
        /// Releases unmanaged and - optionally - managed resources
        /// </summary>
        /// <param name="disposing"><c>true</c> to release 
        /// both managed and unmanaged resources; <c>false</c> 
        /// to release only unmanaged resources.</param>
        private void Dispose(bool disposing)
        {
            if (_disposed) return;
            if (disposing)
            {
                try
                {
                    Stop();
                    // ReSharper disable once RedundantCheckBeforeAssignment
                    if (_listener != null)
                    {
                        _listener = null;
                    }
                }
                catch (SocketException e)
                {
                    RaiseOtherException(null, e.ToString());
                }
            }

            _disposed = true;
        }

        public void UseUnRegisterMessage(string key)
        {
            
        }

        public void Register(string id, Func<string, NetworkStream, string> func)
        {
           
        }

        public void UnRegister(string id)
        {
            
        }

        #endregion
    }
}