using System.Text;
using NewLife.Data;
using NewLife.Log;
using NewLife.Messaging;
using NewLife.Model;
namespace NewLife.Net;
/// <summary>泛型网络服务会话，支持指定服务器类型</summary>
/// <typeparam name="TServer">网络服务器类型，必须继承自 <see cref="NetServer"/></typeparam>
/// <remarks>
/// <para>提供强类型的 Host 属性访问，避免类型转换。</para>
/// <para>适用于需要访问自定义服务器属性或方法的场景。</para>
/// <code>
/// public class MySession : NetSession<MyServer>
/// {
/// protected override void OnReceive(ReceivedEventArgs e)
/// {
/// // 可直接访问 Host.CustomProperty
/// var value = Host.CustomProperty;
/// }
/// }
/// </code>
/// </remarks>
public class NetSession<TServer> : NetSession where TServer : NetServer
{
/// <summary>主服务</summary>
/// <remarks>强类型访问主服务器实例，避免类型转换</remarks>
public virtual TServer Host { get => ((this as INetSession).Host as TServer)!; set => (this as INetSession).Host = value; }
}
/// <summary>网络服务的会话，每个Tcp/Udp连接作为一个会话</summary>
/// <remarks>
/// <para>网络会话是应用层业务处理的核心，封装了单个客户端连接的完整生命周期。</para>
/// <para>设计模式：</para>
/// <list type="bullet">
/// <item>模板方法模式 - 通过重载 OnConnected/OnDisconnected/OnReceive 实现业务逻辑</item>
/// <item>事件驱动模式 - 通过订阅 Connected/Disconnected/Received 事件处理业务</item>
/// <item>协议模式 - 通过 Protocol（IMessageCodec）实现消息定界与编解码</item>
/// </list>
/// <para>生命周期：</para>
/// <list type="number">
/// <item>TCP连接建立或UDP首包到达时，服务器调用 CreateSession 创建会话</item>
/// <item>调用 <see cref="Start"/> 启动会话，初始化网络处理器，触发 <see cref="OnConnected"/></item>
/// <item>数据到达时触发 <see cref="OnReceive"/>，可通过 Send 系列方法发送响应</item>
/// <item>连接断开时触发 <see cref="OnDisconnected(String)"/>，会话被释放</item>
/// </list>
/// <para>典型用法：</para>
/// <code>
/// public class MySession : NetSession
/// {
/// protected override void OnConnected()
/// {
/// base.OnConnected();
/// WriteLog("客户端已连接");
/// Send("Welcome!");
/// }
///
/// protected override void OnReceive(ReceivedEventArgs e)
/// {
/// base.OnReceive(e);
/// // 处理接收到的数据
/// var msg = e.Packet?.ToStr();
/// Send($"Echo: {msg}");
/// }
///
/// protected override void OnDisconnected(String reason)
/// {
/// base.OnDisconnected(reason);
/// WriteLog($"客户端断开: {reason}");
/// }
/// }
/// </code>
/// </remarks>
public class NetSession : DisposeBase, INetSession, IServiceProvider, IExtend
{
#region 属性
/// <summary>唯一会话标识</summary>
/// <remarks>在主服务中唯一标识当前会话，由服务器原子自增分配</remarks>
public virtual Int32 ID { get; internal set; }
/// <summary>主服务</summary>
/// <remarks>负责管理当前会话的主服务器NetServer</remarks>
NetServer INetSession.Host { get; set; } = null!;
/// <summary>客户端Socket会话</summary>
/// <remarks>跟客户端通讯的Socket会话，实际类型为服务端TcpSession/UdpSession</remarks>
public ISocketSession Session { get; set; } = null!;
/// <summary>Socket服务器</summary>
/// <remarks>当前通讯所在的Socket服务器，实际类型为TcpServer/UdpServer</remarks>
public ISocketServer Server { get; set; } = null!;
/// <summary>客户端远程地址</summary>
/// <remarks>获取客户端的网络地址信息</remarks>
public NetUri Remote => Session.Remote;
/// <summary>网络数据处理器</summary>
/// <remarks>
/// <para>可作为业务处理实现，也可以作为前置协议解析，由服务器的 CreateHandler 方法创建。</para>
/// <para>协议模式（<see cref="SessionBase.Protocol"/>）下处理器收到的事件参数同样携带消息对象（<see cref="ReceivedEventArgs.Message"/>）。</para>
/// </remarks>
public INetHandler? Handler { get; set; }
/// <summary>用户会话数据</summary>
/// <remarks>与底层Socket会话共享的扩展数据字典，用于存储会话级别的自定义数据</remarks>
public IDictionary<String, Object?> Items => Session.Items;
/// <summary>获取/设置用户会话数据</summary>
/// <param name="key">数据键名</param>
/// <returns>数据值，不存在时返回null</returns>
public virtual Object? this[String key] { get => Session[key]; set => Session[key] = value; }
/// <summary>会话级作用域服务提供者</summary>
/// <remarks>
/// <para>根据会话创建Scoped范围服务，以使得各服务解析在本会话中唯一。</para>
/// <para>基类使用内置ObjectContainer的Scope，在WebApi/Worker项目中，使用者需要自己创建Scope并赋值服务提供者。</para>
/// </remarks>
public IServiceProvider? ServiceProvider { get; set; }
/// <summary>连接创建事件</summary>
/// <remarks>创建会话并调用 <see cref="Start"/> 后触发</remarks>
public event EventHandler<EventArgs>? Connected;
/// <summary>连接断开事件</summary>
/// <remarks>包括客户端主动断开、服务端主动断开以及服务端超时下线</remarks>
public event EventHandler<EventArgs>? Disconnected;
/// <summary>数据到达事件</summary>
/// <remarks>当有新数据到达时触发，事件参数包含原始数据包和经过管道处理后的消息对象</remarks>
public event EventHandler<ReceivedEventArgs>? Received;
private Int32 _running;
private IServiceScope? _scope;
#endregion
#region 方法
/// <summary>开始会话处理</summary>
/// <remarks>
/// <para>启动会话的数据接收和事件处理流程，由服务器在创建会话后自动调用。</para>
/// <para>执行流程：</para>
/// <list type="number">
/// <item>创建会话级服务提供者作用域</item>
/// <item>创建并初始化网络处理器</item>
/// <item>触发 <see cref="OnConnected"/> 和 <see cref="Connected"/> 事件</item>
/// <item>注册Socket会话的数据接收和断开事件</item>
/// </list>
/// </remarks>
public virtual void Start()
{
if (Interlocked.CompareExchange(ref _running, 1, 0) != 0) return;
WriteLog("Connected {0}", Session);
var host = (this as INetSession).Host;
// 服务提供者，用于创建Scoped范围服务，以使得各服务解析在本会话中唯一
if (ServiceProvider == null)
{
_scope = host.ServiceProvider?.CreateScope();
ServiceProvider = _scope?.ServiceProvider ?? host.ServiceProvider;
}
using var span = host.Tracer?.NewSpan($"net:{host.Name}:Connect", Remote?.ToString());
try
{
// 网络处理器，独立的业务处理器
Handler = host.CreateHandler(this);
Handler?.Init(this);
OnConnected();
var ss = Session;
if (ss != null)
{
//// 网络会话和Socket会话共用用户会话数据
//Items = ss.Items;
ss.Received += Ss_Received;
ss.OnDisposed += Ss_OnDisposed;
ss.Error += OnError;
}
}
catch (Exception ex)
{
span?.SetError(ex, null);
throw;
}
}
/// <summary>处理Socket会话销毁事件</summary>
/// <param name="sender">事件源</param>
/// <param name="e">事件参数</param>
private void Ss_OnDisposed(Object? sender, EventArgs e)
{
try
{
var reason = sender is SessionBase session && !session.CloseReason.IsNullOrEmpty()
? session.CloseReason
: "Disconnect";
Close(reason);
}
catch { }
Dispose();
}
/// <summary>处理Socket会话数据接收事件</summary>
/// <param name="sender">事件源</param>
/// <param name="e">接收事件参数</param>
private void Ss_Received(Object? sender, ReceivedEventArgs e)
{
var host = (this as INetSession).Host;
var tracer = host?.Tracer;
using var span = tracer?.NewSpan($"net:{host?.Name}:Receive", e.Message, e.Packet?.Total ?? 0);
try
{
// 网络处理器先行，还有数据再往下执行
Handler?.Process(e);
// 前面逻辑可能关闭连接，也可能清空数据不允许继续
if (!Disposed && (e.Packet != null || e.Message != null))
OnReceive(e);
}
catch (Exception ex)
{
span?.SetError(ex, e.Message ?? e.Packet);
throw;
}
}
/// <summary>释放资源</summary>
/// <remarks>子类重载实现资源释放逻辑时必须首先调用基类方法</remarks>
/// <param name="disposing">从Dispose调用（释放所有资源）还是析构函数调用（释放非托管资源）</param>
protected override void Dispose(Boolean disposing)
{
base.Dispose(disposing);
// 停止网络处理器
Handler.TryDispose();
Handler = null;
var reason = GetType().Name + (disposing ? "Dispose" : "GC");
try
{
Close(reason);
}
catch { }
//Session.Dispose();//去掉这句话，因为在释放的时候Session有的时候为null，会出异常报错，导致整个程序退出。去掉后正常。
Session?.Dispose();
//Server = null;
//Session = null;
_scope?.Dispose();
_scope = null;
}
/// <summary>关闭跟客户端的网络连接</summary>
/// <remarks>
/// <para>主动断开与客户端的连接。</para>
/// <para>该方法保证 OnDisconnected 只被调用一次，即使多次调用 Close 也是安全的。</para>
/// </remarks>
/// <param name="reason">断开原因。包括 SendError/RemoveNotAlive/Dispose/GC 等，其中 ConnectionReset 为网络被动断开或对方断开</param>
public void Close(String reason)
{
if (Interlocked.CompareExchange(ref _running, 0, 1) != 1) return;
var host = (this as INetSession).Host;
var remoteStr = Remote?.ToString();
using var span = host?.Tracer?.NewSpan($"net:{host.Name}:Disconnect", new { remote = remoteStr, reason });
try
{
WriteLog("Disconnect [{0}] {1}", Session, reason);
// 主动断开底层连接（UDP 会话无连接可断，跳过）；被动断开路径下底层已在关闭，二次关闭是安全空操作
if (Session is ISocketClient sc) sc.Close(reason);
// 只调用带原因的重载，保证 Disconnected 事件只触发一次
OnDisconnected(reason);
}
catch (Exception ex)
{
span?.SetError(ex, null);
throw;
}
}
#endregion
#region 业务核心
/// <summary>新的客户端连接</summary>
/// <remarks>基类负责触发 <see cref="Connected"/> 事件，子类可重载添加自定义逻辑</remarks>
protected virtual void OnConnected() => Connected?.Invoke(this, EventArgs.Empty);
/// <summary>客户端连接已断开</summary>
/// <remarks>基类负责触发 <see cref="Disconnected"/> 事件，子类可重载添加自定义逻辑</remarks>
/// <param name="reason">断开原因。包括 SendError/RemoveNotAlive/Dispose/GC 等，其中 ConnectionReset 为网络被动断开或对方断开</param>
protected virtual void OnDisconnected(String reason) => Disconnected?.Invoke(this, new EventArgs<String>(reason));
/// <summary>收到客户端发来的数据</summary>
/// <remarks>
/// <para>基类负责触发 <see cref="Received"/> 事件，子类可重载添加自定义处理逻辑。</para>
/// <para>事件参数包含原始数据包 Packet 和经过管道处理后的消息对象 Message。</para>
/// </remarks>
/// <param name="e">接收事件参数</param>
protected virtual void OnReceive(ReceivedEventArgs e) => Received?.Invoke(this, e);
/// <summary>发生错误</summary>
/// <remarks>可能是连接断开或其他网络异常</remarks>
/// <param name="sender">事件源</param>
/// <param name="e">异常事件参数</param>
protected virtual void OnError(Object? sender, ExceptionEventArgs e) => WriteError(e.Exception.Message);
#endregion
#region 发送数据
/// <summary>发送数据包</summary>
/// <remarks>直达网卡，不经过管道处理</remarks>
/// <param name="data">数据包</param>
/// <returns>当前会话实例，支持链式调用</returns>
public virtual INetSession Send(IPacket data)
{
var host = (this as INetSession).Host;
using var span = host?.Tracer?.NewSpan($"net:{host.Name}:Send", data, data.Total);
Session.Send(data);
return this;
}
/// <summary>发送字节数组</summary>
/// <remarks>直达网卡，不经过管道处理</remarks>
/// <param name="data">字节数组</param>
/// <param name="offset">数据起始偏移量</param>
/// <param name="count">发送字节数，-1表示发送从偏移量开始的所有数据</param>
/// <returns>当前会话实例，支持链式调用</returns>
public virtual INetSession Send(Byte[] data, Int32 offset = 0, Int32 count = -1)
{
var host = (this as INetSession).Host;
var len = count > 0 ? count : data.Length - offset;
using var span = host?.Tracer?.NewSpan($"net:{host.Name}:Send", data.ToHex(offset, len > 64 ? 64 : len), len);
Session.Send(data, offset, count);
return this;
}
/// <summary>发送只读内存段</summary>
/// <remarks>直达网卡，高性能API，避免不必要的内存拷贝</remarks>
/// <param name="data">只读内存段</param>
/// <returns>当前会话实例，支持链式调用</returns>
public virtual INetSession Send(ReadOnlySpan<Byte> data)
{
var host = (this as INetSession).Host;
using var span = host?.Tracer?.NewSpan($"net:{host.Name}:Send", null, data.Length);
Session.Send(data);
return this;
}
/// <summary>发送数据流</summary>
/// <remarks>直达网卡，适用于大数据量流式传输场景</remarks>
/// <param name="stream">数据流</param>
/// <returns>当前会话实例，支持链式调用</returns>
public virtual INetSession Send(Stream stream)
{
var host = (this as INetSession).Host;
using var span = host?.Tracer?.NewSpan($"net:{host.Name}:Send");
Session.Send(stream);
return this;
}
/// <summary>发送字符串</summary>
/// <remarks>直达网卡，使用指定编码将字符串转换为字节后发送</remarks>
/// <param name="msg">要发送的字符串</param>
/// <param name="encoding">字符编码，默认UTF-8</param>
/// <returns>当前会话实例，支持链式调用</returns>
public virtual INetSession Send(String msg, Encoding? encoding = null)
{
encoding ??= Encoding.UTF8;
var host = (this as INetSession).Host;
using var span = host?.Tracer?.NewSpan($"net:{host.Name}:Send", msg, encoding.GetByteCount(msg));
Session.Send(msg, encoding);
return this;
}
/// <summary>发送消息，不等待响应。经协议（<see cref="SessionBase.Protocol"/>）构建整帧后发送</summary>
/// <param name="message">应用层消息对象（须实现 <see cref="IMessage"/>）</param>
/// <returns>实际发送的字节数</returns>
public virtual Int32 SendMessage(Object message) => Session.SendMessage(message);
/// <summary>发送响应消息</summary>
/// <remarks>
/// 协议模式下，响应消息应已通过 <see cref="IMessage.CreateReply"/> 构造（继承请求的配对键），
/// 本方法仅转发发送，不再关联接收上下文。
/// </remarks>
/// <param name="message">响应消息对象</param>
/// <param name="eventArgs">接收到请求的事件参数（保留签名兼容）</param>
/// <returns>实际发送的字节数</returns>
public virtual Int32 SendReply(Object message, ReceivedEventArgs eventArgs) => Session?.SendMessage(message) ?? -1;
/// <summary>异步发送消息并等待响应（协议模式）</summary>
/// <remarks>经协议构建整帧发送，收到匹配响应后交付消息本体，支持超时取消</remarks>
/// <param name="message">请求消息对象</param>
/// <param name="cancellationToken">取消令牌，用于超时控制</param>
/// <returns>响应消息对象</returns>
public virtual ValueTask<Object> SendMessageAsync(Object message, CancellationToken cancellationToken = default) => Session.SendMessageAsync(message, cancellationToken);
#endregion
#region 日志
/// <summary>日志提供者</summary>
public ILog? Log { get; set; }
private String? _LogPrefix;
/// <summary>日志前缀</summary>
public virtual String LogPrefix
{
get
{
if (_LogPrefix == null)
{
var host = (this as INetSession).Host;
var name = host == null ? "" : host.Name;
_LogPrefix = $"{name}[{ID}] ";
}
return _LogPrefix;
}
set => _LogPrefix = value;
}
/// <summary>写日志</summary>
/// <param name="format">格式化字符串</param>
/// <param name="args">参数</param>
public virtual void WriteLog(String format, params Object?[] args) => Log?.Info(LogPrefix + format, args);
/// <summary>输出错误日志</summary>
/// <param name="format">格式化字符串</param>
/// <param name="args">参数</param>
public virtual void WriteError(String format, params Object?[] args) => Log?.Error(LogPrefix + format, args);
#endregion
#region 辅助
/// <summary>已重载。返回会话的字符串表示</summary>
/// <returns>格式为 "服务名[会话ID] Socket会话信息"</returns>
public override String ToString() => $"{(this as INetSession).Host?.Name}[{ID}] {Session}";
/// <summary>获取服务</summary>
/// <remarks>
/// <para>实现 <see cref="IServiceProvider"/> 接口，支持依赖注入。</para>
/// <para>优先返回内置类型：IServiceProvider、NetSession、INetSession、NetServer、ISocketSession、ISocketServer。</para>
/// <para>其他类型从 <see cref="ServiceProvider"/> 获取。</para>
/// </remarks>
/// <param name="serviceType">服务类型</param>
/// <returns>服务实例</returns>
public virtual Object GetService(Type serviceType)
{
if (serviceType == typeof(IServiceProvider)) return this;
if (serviceType == typeof(NetSession)) return this;
if (serviceType == typeof(INetSession)) return this;
if (serviceType == typeof(NetServer)) return (this as INetSession).Host;
if (serviceType == typeof(ISocketSession)) return Session;
if (serviceType == typeof(ISocketServer)) return Server;
return ServiceProvider?.GetService(serviceType)!;
}
#endregion
}
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