.net core 3.0 Signalr - 07 业务实现-服务端 自定义管理组、用户、连接

## Hub的管理 - 重写OnConnectedAsync 从连接信息中获取UserId、Groups,ConnectId，并实现这三者的关系，存放于redis中 [代码请查看](https://github.com/xiexingen/CTS.Signalr/blob/master/CTS.Signalr.Server/Hubs/NotifyHub.cs) ``` C# using CTS.Signalr.Server.Cores; using CTS.Signalr.Server.Dtos; using Microsoft.AspNetCore.Authorization; using Microsoft.AspNetCore.SignalR; using Microsoft.Extensions.Logging; using System; using System.Linq; using System.Threading.Tasks; namespace CTS.Signalr.Server.Hubs { ///

/// 服务端接口 ///

public interface IServerNotifyHub { } ///

/// 客户端使用的接口 ///

public interface IClientNotifyHub { Task OnNotify(object data); Task OnLine(object data); Task OffLine(object data); } [Authorize] public class NotifyHub : Hub ,IServerNotifyHub { private readonly SignalrRedisHelper _signalrRedisHelper; private readonly ILogger _logger; public NotifyHub(SignalrRedisHelper signalrRedisHelper, ILogger logger) { _signalrRedisHelper = signalrRedisHelper; _logger = logger; } public override async Task OnConnectedAsync() { //await Clients.All.OnNotify(new { UserId= Context.User.Identity.Name, Name=Context.User.Identity.Name, ConnectId = Context.ConnectionId }); var userId= Context.User.Identity.Name; var groups=Context.GetHttpContext().Request.Query["group"].FirstOrDefault(); _logger.LogDebug($"OnConnectedAsync----userId:{userId},groups:{groups},connectionId:{ Context.ConnectionId}"); if (!string.IsNullOrWhiteSpace(userId)) { await _signalrRedisHelper.AddConnectForUserAsync(userId, Context.ConnectionId); await JoinToGroup(userId, Context.ConnectionId, groups?.Split(',')); await DealOnLineNotify(userId, Context.ConnectionId); } await base.OnConnectedAsync(); } public override async Task OnDisconnectedAsync(Exception exception) { var userId = Context.User.Identity.Name; var groups = Context.GetHttpContext().Request.Query["group"].FirstOrDefault(); _logger.LogDebug($"OnDisconnectedAsync----userId:{userId},groups:{groups},connectionId:{ Context.ConnectionId}"); if (!string.IsNullOrWhiteSpace(userId)) { await _signalrRedisHelper.RemoveConnectForUserAsync(userId, Context.ConnectionId); await DealOffLineNotify(userId,Context.ConnectionId); } await LeaveFromGroup(Context.ConnectionId, groups?.Split(',')); await base.OnDisconnectedAsync(exception); } ///

/// 加入组 ///

/// /// private async Task JoinToGroup(string userId,string connectionId,params string[] groups) { if (!string.IsNullOrWhiteSpace(userId)&& groups!=null&&groups.Length>0) { foreach (var group in groups) { await Groups.AddToGroupAsync(connectionId, group); await _signalrRedisHelper.AddUserForGroupAsync(group, connectionId, userId); // await Clients.Group(group).OnJoinGroup(new { ConnectId = connectionId, UserId = userId, GroupName = group }); } } } ///

/// 从组中移除 ///

/// /// private async Task LeaveFromGroup(string connectionId,params string[] groups) { if (groups != null && groups.Length > 0) { foreach (var group in groups) { await Groups.RemoveFromGroupAsync(connectionId, group); await _signalrRedisHelper.RemoveConnectFromGroupAsync(group,connectionId); // await Clients.Group(group).OnLeaveGroup(new { ConnectId = connectionId, GroupName = group }); } } } ///

/// 处理上线通知(只有用户第一个连接才通知) ///

/// /// /// private async Task DealOnLineNotify(string userId,string connectionId) { var userConnectCount = await _signalrRedisHelper.GetConnectsCountByUserAsync(userId); await Clients.All.OnLine(new OnLineData() { UserId = userId, ConnectionId = connectionId, IsFirst = userConnectCount == 1 }); } ///

/// 处理下线通知(只有当用户一个连接都没了 才算下线) ///

/// /// /// private async Task DealOffLineNotify(string userId,string connectionId) { var userConnectCount = await _signalrRedisHelper.GetConnectsCountByUserAsync(userId); await Clients.All.OffLine(new OffLineData() { UserId = userId, ConnectionId = connectionId, IsLast = userConnectCount == 0 }); } } } ``` ## 提供给业务系统调用的API - [POST] api/notify/post application/json形式 提交，数据格式如下 ``` json { GroupIds:'', // [可空] 组id集合，多个用,隔开 UserIds:'',// [可空] 用户id集合，多个用,隔开 ExcludeUsers:boolean, // 是否排除用户列表中的用户 NotifyObj:Object // 通知的对象，任意类型(总大小不要超过36k) } ``` * 有GroupIds * ExcludeUsers=true 推送给指定的组中所有用户(排除掉UserIds部分) * ExcludeUsers=false 推送给组中指定(UserIds中指定的)的这些用户 * 无GroupIds * ExcludeUsers=true 推送给当前所有连接(排除掉UserIds部分的用户) * ExcludeUsers=false 推送给指定用户(UserIds中指定的用户) - [POST] api/notify/postConnects application/json提交，数据格式如下 ``` json { Connects:'', // 连接Id集合，多个用，隔开 NotifyObj:Object // 通知的对象，任意类型(总大小不要超过36k) } ``` * 有UserId * ExcludeConnectId=true 给改用户除指定的ConnectId外的所有连接端推送 * ExcludeConnectId=false 跟没指定UserId一致 * 无UserId 给指定连接Id推送 - [GET] api/users 获取在线用户Id列表 - [GET] api/groups 获取在线组列表 ## 增加日志记录 为了方便分析和定位问题，使用log4net来作为日志记录器。 - nuget 安装log4net nuget 搜索 log4net，安装 - Config中配置 在Config中注入ILoggerFactory，然后使用添加Log4Net,代码如下所示 ``` C# public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } app.UseHsts(); loggerFactory.AddLog4Net(); ... } ``` - 添加log4net配置文件 更多配置请自行查找log4net官方配置文档 ``` xml ``` 至此，log4net配置完毕 更多内容请通过快速导航查看下一篇 ## 快速导航 | 标题 | 内容 | :--- | :--- | 索引 | [.net core 3.0 Signalr - 实现一个业务推送系统](/2019/09/20/dotnetcore/signalr/00-introduct/) | 上一篇 | [.net core 3.0 Signalr - 06 业务实现-业务分析](https://blogs.xxgtalk.cn/2019/10/03/dotnetcore/signalr/06-analysis/) | 下一篇 | [.net core 3.0 Signalr - 08 业务实现-客户端demo](https://blogs.xxgtalk.cn/2019/10/05/dotnetcore/signalr/08-clientdemo/) | 源码地址 | [源码](https://github.com/xiexingen/CTS.Signalr) | 官方文档 | [官方文档](https://docs.microsoft.com/zh-CN/aspnet/core/?view=aspnetcore-3.0)