集成RocketChat至现有的.Net项目中，为ChatGPT铺路

前言

今天我们来聊一聊一个Paas的方案，如何集成到一个既有的项目中。
以其中一个需求为例子：在产品项目中，加入IM（即时通信）功能，开始徒手撸代码，会发现工作量很大，去github找开源项目，结果也可能事与愿违：功能不够强大，或者用不同的语言编写的，编译出来程序集无法集成到项目中。
可能当下最好的方案是利用独立的聊天功能组件，作为项目的中间件（Paas方案）。

1. 组件是独立部署，独立运行的，功能的稳定性，搭建速度快，
2. 作为基础设施服务，可以用在其他项目中，并且项目中的对接作为抽象层，可随时替换现有组件。

这个聊天组件就是RocketChat。
RocketChat 是一款免费，开源的聊天软件平台。
其主要功能是：群组聊天、相互通信、私密聊群、桌面通知、文件上传、语音/视频、截图等，实现了用户之间的实时消息转换。
https://github.com/RocketChat/Rocket.Chat

它本身是使用Meteor全栈框架以JavaScript开发的Web聊天服务器。本身带有一个精美的web端，甚至有开源的App端。
集成到一个既有的项目中我们是需要做减法的，然而在实际对接中，我们仍然需要解决一些问题：
首先是Rocket.Chat自己有一套独立的用户系统，其中登录鉴权逻辑，这一部分是我们不需要的。
第二是Rocket.Chat聊天功能依赖这个用户系统，需要简化流程同步用户信息，只保留用户，不需要权限，角色。

准备工作：搭建Rocket.Chat服务

Rocket.Chat有两套Api，一个是基于https的REST Api，和一个基于wss的Realtime API， https://developer.rocket.chat/reference/api/realtime-api
这两个Api都需要鉴权。

解决这个有两套方案，一个是通过完全的后端接管，两个Api都经过后端项目进行转发，另一个是后端只接管REST Api， Realtime API和Rocket.Chat服务直接通信

项目搭建

后端

新建一个.Net 6 Abp项目后，添加AbpBoilerplate.RocketChat库，AbpBoilerplate.RocketChat的具体介绍请参考https://blog.csdn.net/jevonsflash/article/details/128342430

dotnet add package AbpBoilerplate.RocketChat

在Domain层中创建IM项目，创建Authorization目录存放与IM鉴权相关的代码，ImWebSocket目录用于存放处理Realtime API相关的代码.

在搭建Rocket.Chat环节，还记得有一个设置管理员的步骤吗？在AdminUserName和AdminPassword配置中，指定这个管理员的密码，

管理员用于在用户未登录时，提供操作的权限主体，

  "Im": {"Provider": "RocketChat","Address": "http://localhost:3000/","WebSocketAddress": "ws://localhost:3000/","AdminUserName": "super","AdminPassword": "123qwe","DefaultPassword": "123qwe"}

前端

用vue2来搭建一个简单的前端界面，需要用到以下库

• element-UI库
• axios
• vuex
• signalr
  新建一个vue项目，在package.json中的 "dependencies"添加如下：

"axios": "^0.26.1",
"element-ui": "^2.15.6",
"@microsoft/signalr": "^5.0.6"
"vuex": "^3.6.2"

代理账号

代理账号是一个管理员账号
在程序的启动时，要登录这个管理员账号，并保存Token，程序停止时退出登录这个账号。
我们需要一个cache存储管理员账号的登录信息（用户ID和Token）
在Threads目录下创建ImAdminAgentAuthBackgroundWorker，
并在ImModule中注册这个后台任务

private async Task LoginAdminAgent()
{var userName = rocketChatConfiguration.AdminUserName;var password = rocketChatConfiguration.AdminPassword;var loginResult = await imManager.Authenticate(userName, password);if (loginResult.Success && loginResult.Content != null){var cache = imAdminAgentCache.GetCache("ImAdminAgent");await cache.SetAsync("UserId", loginResult.Content.Data.UserId);await cache.SetAsync("AuthToken", loginResult.Content.Data.AuthToken);await cache.SetAsync("UserName", userName);}else{throw new UserFriendlyException("无法登录IM服务Admin代理账号");}
}public override async void Stop()
{base.Stop();var cache = imAdminAgentCache.GetCache("ImAdminAgent");var token = (string)cache.Get("AuthToken", (i) => { return string.Empty; });var userId = (string)cache.Get("UserId", (i) => { return string.Empty; });if (string.IsNullOrEmpty(token) || string.IsNullOrEmpty(userId)){return;}using (_iocManager.IocContainer.BeginScope()) //extension method{_iocManager.Resolve<SessionContextDto>().Token = token;_iocManager.Resolve<SessionContextDto>().UserId = userId;_iocManager.Resolve<SessionContextDto>().IsAuthorized = true;try{await imManager.Logout();}catch (Exception ex){throw;}}}

SessionContextDto是一个会话上下文对象，在.net项目中，登录校验成功后写入，在请求Rocket.Chat的时候读取，并写入到请求头中。

在ImModule的PostInitialize方法中注册ImAdminAgentAuthBackgroundWorker

public override void PostInitialize()
{var workerManager = IocManager.Resolve<IBackgroundWorkerManager>();workerManager.Add(IocManager.Resolve<ImAdminAgentAuthBackgroundWorker>());
}

用户登录时，需要传用户名密码，用户名是跟.net项目中相同的，密码可以独立设置，也可以设定约定一个默认密码，那么新建用户和登录的时候，可以不用传密码，直接使用默认密码即可，用户成功登录后，将用户ID和Token回传给前端。

定义传输对象类AuthenticateResultDto

public class AuthenticateResultDto
{public string AccessToken { get; set; }public string UserId { get; set; }
}

在应用层中创建类ImAppService，创建应用层服务Authenticate，用于用户登录。

 private async Task<AuthenticateResultDto> Authenticate(MatoAppSample.Authorization.Users.User user, string password = null)
{var loginResult = await _imManager.Authenticate(user.UserName, password);if (loginResult.Success){var userId = loginResult.Content.Data.UserId;var token = loginResult.Content.Data.AuthToken;this.imAuthTokenCache.Set(user.UserName, new ImAuthTokenCacheItem(userId, token), new TimeSpan(1, 0, 0));}else{this.imAuthTokenCache.Remove(user.UserName);throw new UserFriendlyException($"登录失败, {loginResult.Error}");}return new AuthenticateResultDto{AccessToken = loginResult.Content.Data.AuthToken,UserId = loginResult.Content.Data.UserId};
}

鉴权方式介绍

由于Rocket.Chat的Realtime API基于REST API基础上进行鉴权，在调用完成/api/v1/login接口后，需要在已经建立的Websocket连接中发送

{"msg": "method","method": "login","id": "42","params":[{ "resume": "auth-token" }]
}

详见官方文档

在集成RocketChat时，对于Realtime API方案有二：

1. 前端鉴权，前端通过Abp登录后，调用/api/v1/login接口，返回token之后存入前端Token缓存中，之后前端将与Rocketchat直接建立websocket联系，订阅的聊天消息和房间消息将被直接推送至前端。

   优点是消息订阅推送直接，效率较高，但前端需要同时顾及Abp的鉴权和RocketChat Realtime API鉴权，前端的代码逻辑复杂，代理账号逻辑复杂，后期扩展性差。小型项目适合此方式

2. 后端鉴权，前端通过Abp登录后，调用/api/v1/login接口，返回token之后存入后端Token缓存中，由后端发起websocket连接，订阅的聊天消息和房间消息将被转发成signalR消息发送给前端，由后端缓存过期机制统一管理各连接的生命周期。

   优点是统一了前端的消息推送机制，架构更趋于合理，对于多用户端的大型项目，能够减少前端不必要的代码逻辑。但是后端的代码会复杂一些。适合中大型项目。

Realtime API 的前端鉴权

Realtime API 的后端鉴权

登录校验模块

前端鉴权方式

由于是从小程序，或者web端共用的所以要分别从Header和Cookie中获取登录信息，IHttpContextAccessor类型的参数用于从http请求上下文对象中访问Header或Cookie，

整个流程如下：

创建AuthorizedFrontendWrapper.cs，新建AuthorizationVerification方法，此方法是登录校验逻辑

private static void AuthorizationVerification(IHttpContextAccessor _httpContextAccessor, bool useAdminIfNotAuthorized, out StringValues? token, out StringValues? userId)
{var isCommonUserLoginPassed = true;token = _httpContextAccessor.HttpContext?.Request.Headers["X-Auth-Token"];userId = _httpContextAccessor.HttpContext?.Request.Headers["X-User-Id"];if (!ValidateToken(token, userId)){token = _httpContextAccessor.HttpContext?.Request.Cookies["chat_token"];userId = _httpContextAccessor.HttpContext?.Request.Cookies["chat_uid"];if (!ValidateToken(token, userId)){isCommonUserLoginPassed = false;}}var cache = Manager.GetCache("ImAdminAgent");if (!isCommonUserLoginPassed){if (useAdminIfNotAuthorized){//若不存在则取admin作为主体token = (string)cache.Get("AuthToken", (i) => { return string.Empty; });userId = (string)cache.Get("UserId", (i) => { return string.Empty; });if (!ValidateToken(token, userId)){throw new UserFriendlyException("操作未取得IM服务授权, 当前用户未登录，且初始代理用户未登录");}}else{throw new UserFriendlyException("操作未取得IM服务授权, 当前用户未登录");}}else{if ((string)cache.Get("UserId", (i) => { return string.Empty; }) == userId.Value){token = (string)cache.Get("AuthToken", (i) => { return string.Empty; });if (!ValidateToken(token, userId)){throw new UserFriendlyException("操作未取得IM服务授权, 初始代理用户未登录");}}}
}

后端鉴权方式

整个流程如下：

创建AuthorizedBackendWrapper.cs，新建AuthorizationVerification方法，登录校验代码如下

public void AuthorizationVerification(out string token, out string userId)
{User user = null;try{user = userManager.FindByIdAsync(abpSession.GetUserId().ToString()).Result;}catch (Exception){}var userName = user != null ? user.UserName : rocketChatConfiguration.AdminUserName;var password = user != null ? ImUserDefaultPassword : rocketChatConfiguration.AdminPassword;var userIdAndToken = imAuthTokenCache.Get(userName, (i) => { return default; });if (userIdAndToken == default){var loginResult = imManager.Authenticate(userName, password).Result;if (loginResult.Success && loginResult.Content != null){userId = loginResult.Content.Data.UserId;token = loginResult.Content.Data.AuthToken;var imAuthTokenCacheItem = new ImAuthTokenCacheItem(userId, token);imAuthTokenCache.Set(userName, imAuthTokenCacheItem, new TimeSpan(1, 0, 0));var userIdentifier = abpSession.ToUserIdentifier();if (userIdentifier != null){Task.Run(async () =>{await Login(imAuthTokenCacheItem, userIdentifier, userName);});}}else{var adminUserName = rocketChatConfiguration.AdminUserName;var adminPassword = rocketChatConfiguration.AdminPassword;var adminLoginResult = imManager.Authenticate(adminUserName, adminPassword).Result;if (adminLoginResult.Success && adminLoginResult.Content != null){userId = adminLoginResult.Content.Data.UserId;token = adminLoginResult.Content.Data.AuthToken;if (!ValidateToken(token, userId)){throw new UserFriendlyException("操作未取得IM服务授权, 无法登录账号" + userName);}}else{throw new UserFriendlyException("账号登录失败:" + adminLoginResult.Error);}}}else{userId = userIdAndToken.UserId;token = userIdAndToken.Token;}if (!ValidateToken(token, userId)){throw new UserFriendlyException("操作未取得IM服务授权, 登录失败");}
}

登录委托

在AuthorizedFrontendWrapper（或AuthorizedBackendWrapper）中

写一个登录委托AuthorizedChatAction，用于包装一个需要登录之后才能使用的操作

public static async Task AuthorizedChatAction(Func<Task> func, IocManager _iocManager)
{if (_iocManager.IsRegistered<SessionContextDto>()){string token, userId;AuthorizationVerification(out token, out userId);using (_iocManager.IocContainer.Begin()) //extension method{_iocManager.Resolve<SessionContextDto>().Token = token;_iocManager.Resolve<SessionContextDto>().UserId = userId;_iocManager.Resolve<SessionContextDto>().IsAuthorized = true;try{await func();}catch (Exception ex){throw;}}}else{throw new UserFriendlyException("没有注册即时通信会话上下文对象");}
}

使用登录委托

我们在创建IM相关方法的时候，需要用AuthorizedFrontendWrapper（或AuthorizedBackendWrapper），来包装登录校验的逻辑。

public async Task<bool> DeleteUser(long userId)
{var user = await _userManager.GetUserByIdAsync(userId);var result = await AuthorizedBackendWrapper.AuthorizedChatAction(() =>{return _imManager.DeleteUser(user.UserName);}, _iocManager);if (!result.Success || !result.Content){throw new UserFriendlyException($"删除失败, {result.Error}");}return result.Content;
}

处理聊天消息

前端鉴权方式

新建messageHandler_frontend_auth.ts处理程序

客户端支持WebSocket的浏览器中，在创建socket后，可以通过onopen、onmessage、onclose和onerror四个事件对socket进行响应。

我已经封装好了一个WebSocket 通信模块\web\src\utils\socket.ts，Socket对象是一个WebSocket抽象，后期将扩展到uniapp小程序项目上使用的WebSocket。通过这个对象可以方便的进行操作。

创建一个Socket对象wsConnection，用于接收和发送基于wss的Realtime API消息

const wsRequestUrl: string = "ws://localhost:3000/websocket";const socketOpt: ISocketOption = {server: wsRequestUrl,reconnect: true,reconnectDelay: 2000,
};const wsConnection: Socket = new Socket(socketOpt);

WebSocket的所有操作都是采用事件的方式触发的，这样不会阻塞UI，是的UI有更快的响应时间，有更好的用户体验。

连接建立后，客户端和服务器就可以通过TCP连接直接交换数据。我们订阅onmessage事件触发newMsgHandler处理信息

wsConnection.$on("message", newMsgHandler);

当链接打开后，立即发送{"msg":"connect","version":"1","support":["1","pre2","pre1"]}报文

wsConnection.$on("open", (newMsg) => {console.info("WebSocket Connected");wsConnection.send({msg: "connect",version: "1",support: ["1"],});});

建立链接后，会从Rocket.Chat收到connected消息，此时需要发送登录请求的消息到Rocket.Chat
接收到报文

"{"msg":"connected","session":"cMvzWpCNSCR24bwCf"}"

发送报文

{"msg":"method","method":"login","params":[{"resume":"wY67O8rJFyf2FrqD5vxpQjIUs5tdThmyfW_VaA7MrsG"}],"id":"1"}

接下来，在newMsgHandler方法中，根据msg类型，处理一系列的消息

const newMsgHandler: Function = (newMsgRaw) => {if (!getIsNull(newMsgRaw)) {if (newMsgRaw.msg == "ping") {wsConnection.send({msg: "pong",});} else if (newMsgRaw.msg == "connected") {let newMsg: ConnectedWsDto = newMsgRawlet session = newMsg.session;if (wsConnection.isConnected) {wsConnection.send({msg: "method",method: "login",params: [{resume: UserModule.chatToken,},],id: "1",});}} else if (newMsgRaw.msg == "added") {subEvent("stream-notify-user", "message");subEvent("stream-notify-user", "subscriptions-changed");subEvent("stream-notify-user", "rooms-changed");} else if (newMsgRaw.msg == "changed") {let newMsg: SubChangedWsDto = newMsgRawif (newMsg.collection == "stream-notify-user") {let fields = newMsg.fields;if (fields.eventName.indexOf("/") != -1) {let id = fields.eventName.split('/')[0];let eventName = fields.eventName.split('/')[1];if (eventName == "subscriptions-changed") {let args = fields.args;let msg: ISubscription = null;let method: string;args.forEach((arg) => {if (typeof arg == "string") {if (arg == "remove" || arg == "insert") {method = arg;}}else if (typeof arg == "object") {msg = arg}});$EventBus.$emit("getRoomSubscriptionChangedNotification", { msg, method });}else if (eventName == "rooms-changed") {let args = fields.args;let msg: RoomMessageNotificationDto = null;args.forEach((arg) => {if (typeof arg == "object") {msg = arg}});$EventBus.$emit("getRoomMessageNotification", msg.lastMessage);}}else {let id = fields.eventName}}else if (newMsg.collection == "stream-room-messages") {let fields = newMsg.fields;let id = fields.eventNamelet msg: MessageItemDto = fields.args;$EventBus.$emit("getRoomMessageNotification", msg);}}}
}

store/chat.ts文件中，定义了ChatState用于存储聊天信息，当有消息收到，或者房间信息变更时，更新这些存储对象

export interface IChatState {currentChannel: ChannelDto;channelList: Array<ChannelDto>;currentMessage: MessageDto;
}

后端校验方式

Login时将生成webSocket对象，并发送connect消息

public async Task Login(ImAuthTokenCacheItem imAuthTokenCacheItem, UserIdentifier userIdentifier, string userName)
{using (var webSocket = new ClientWebSocket()){webSocket.Options.RemoteCertificateValidationCallback = delegate { return true; };var url = Flurl.Url.Combine(rocketChatConfiguration.WebSocketHost, "websocket");await webSocket.ConnectAsync(new Uri(url), CancellationToken.None);if (webSocket.State == WebSocketState.Open){var model = new ImWebSocketConnectRequest(){Msg = "connect",Version = "1",Support = new string[] { "1" }};var jsonStr = JsonConvert.SerializeObject(model);var sendStr = Encoding.UTF8.GetBytes(jsonStr);await webSocket.SendAsync(sendStr, WebSocketMessageType.Text, true, CancellationToken.None);await Echo(webSocket, imAuthTokenCacheItem, userIdentifier, userName);}}
}

每次接收指令时，将判断缓存中的Token值是否合法，若不存在，或过期（session变化），将主动断开websocket连接
在接收Realtime API消息后，解析方式同前端鉴权逻辑
在拿到数据后，做signalR转发。

private async Task Echo(WebSocket webSocket, ImAuthTokenCacheItem imAuthTokenCacheItem, UserIdentifier userIdentifier, string userName)
{JsonSerializerSettings serializerSettings = new JsonSerializerSettings(){NullValueHandling = NullValueHandling.Ignore};var buffer = new byte[1024 * 4];var receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);string session=string.Empty;ImAuthTokenCacheItem im;while (!receiveResult.CloseStatus.HasValue){im = imAuthTokenCache.GetOrDefault(userName);if (im == null){await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure,"缓存超时自动退出",CancellationToken.None);Console.WriteLine(userName + "超时主动断开IM连接");break;}else{if (!string.IsNullOrEmpty(session) && im.Session!=session){await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure,"缓存更新自动退出",CancellationToken.None);Console.WriteLine(userName + "缓存更新主动断开IM连接");break;}}var text = Encoding.UTF8.GetString(buffer.AsSpan(0, receiveResult.Count));if (!string.IsNullOrEmpty(text)){dynamic response = JsonConvert.DeserializeObject<dynamic>(text);if (response.msg == "ping"){var model = new ImWebSocketCommandRequest(){Msg = "pong",};var jsonStr = JsonConvert.SerializeObject(model, serializerSettings);var sendStr = Encoding.UTF8.GetBytes(jsonStr);await webSocket.SendAsync(sendStr, WebSocketMessageType.Text, true, CancellationToken.None);}if (response.msg == "connected"){session = response.session;var model = new ImWebSocketCommandRequest(){Msg = "method",Method = "login",Params = new object[]{new {resume = imAuthTokenCacheItem.Token,}},Id = "1"};imAuthTokenCacheItem.Session = session;imAuthTokenCache.Set(userName, imAuthTokenCacheItem, new TimeSpan(1, 0, 0));var jsonStr = JsonConvert.SerializeObject(model, serializerSettings);var sendStr = Encoding.UTF8.GetBytes(jsonStr);await webSocket.SendAsync(sendStr, WebSocketMessageType.Text, true, CancellationToken.None);}else if (response.msg == "added"){await SubEvent(webSocket, imAuthTokenCacheItem, "stream-notify-user", "message");await SubEvent(webSocket, imAuthTokenCacheItem, "stream-notify-user", "subscriptions-changed");await SubEvent(webSocket, imAuthTokenCacheItem, "stream-notify-user", "rooms-changed");}else if (response.msg == "changed"){var newMsg = response;if (newMsg.collection == "stream-notify-user"){var fields = newMsg.fields;var fullEventName = fields.eventName.ToString();if (fullEventName.IndexOf("/") != -1){var id = fullEventName.Split('/')[0];var eventName = fullEventName.Split('/')[1];if (eventName == "subscriptions-changed"){var args = fields.args;dynamic msg = null;var method = string.Empty;foreach (var arg in args as IEnumerable<dynamic>){if (arg.ToString() == "remove" || arg.ToString() == "insert"){method = arg.ToString();}else{msg = arg;}}await signalREventPublisher.PublishAsync(userIdentifier, "getRoomSubscriptionChangedNotification", new { msg, method });}else if (eventName == "rooms-changed"){var args = fields.args;dynamic msg = null;var method = string.Empty;foreach (var arg in args as IEnumerable<dynamic>){if (arg.ToString() == "updated"){method = arg.ToString();}else{msg = arg;}};var jobject = msg.lastMessage as JObject;await signalREventPublisher.PublishAsync(userIdentifier, "getRoomMessageNotification", jobject);}}else{var id = fields.eventName;}}}else if (response.collection == "stream-room-messages"){var fields = response.fields;var id = fields.eventName;var msg = fields.args;var jobject = msg as JObject;await signalREventPublisher.PublishAsync(userIdentifier, "getRoomMessageNotification", jobject);}}try{receiveResult = await webSocket.ReceiveAsync(
new ArraySegment<byte>(buffer), CancellationToken.None);}catch (Exception ex){Console.WriteLine(userName + "异常断开IM连接");break;}}try{await webSocket.CloseAsync(
receiveResult.CloseStatus.Value,
receiveResult.CloseStatusDescription,
CancellationToken.None);}catch (Exception ex){}imAuthTokenCache.Remove(userName);}private async Task SubEvent(WebSocket webSocket, ImAuthTokenCacheItem imAuthTokenCacheItem, string name, string type)
{var eventstr = $"{imAuthTokenCacheItem.UserId}/${type}";var id = RandomHelper.GetRandom(100000).ToString().PadRight(5, '0');var model = new ImWebSocketCommandRequest(){Msg = "sub",Params = new object[]{eventstr,new {useCollection= false,args = new string[]{ }}},Id = id,Name = name,};var jsonStr = JsonConvert.SerializeObject(model);var sendStr = Encoding.UTF8.GetBytes(jsonStr);await webSocket.SendAsync(sendStr, WebSocketMessageType.Text, true, CancellationToken.None);
}

SignalREventPublisher.cs 中的PublishAsync，将消息转发给对应的用户。

public async Task PublishAsync(IUserIdentifier userIdentifier, string method, object message)
{try{var onlineClients = _onlineClientManager.GetAllByUserId(userIdentifier);foreach (var onlineClient in onlineClients){var signalRClient = _hubContext.Clients.Client(onlineClient.ConnectionId);if (signalRClient == null){Logger.Debug("Can not get user " + userIdentifier.ToUserIdentifier() + " with connectionId " + onlineClient.ConnectionId + " from SignalR hub!");continue;}await signalRClient.SendAsync(method, message);}}catch (Exception ex){Logger.Warn("Could not send notification to user: " + userIdentifier.ToUserIdentifier());Logger.Warn(ex.ToString(), ex);}}

前端代码则要简单得多
新建messageHandler_backend_auth.ts处理程序

import * as signalR from "@microsoft/signalr";

创建一个HubConnection对象hubConnection，用于接收SignalR消息

const baseURL = "http://localhost:44311/"; // url = base url + request url
const requestUrl = "signalr";
let header = {};
if (UserModule.token) {header = {"X-XSRF-TOKEN": UserModule.token,Authorization: "Bearer " + UserModule.token,};
}//signalR config
const hubConnection: signalR.HubConnection = new signalR.HubConnectionBuilder().withUrl(baseURL + requestUrl, {headers: header,accessTokenFactory: () => getAccessToken(),transport: signalR.HttpTransportType.WebSockets,logMessageContent: true,logger: signalR.LogLevel.Trace,}).withAutomaticReconnect().withHubProtocol(new signalR.JsonHubProtocol()).build();

我们只需要响应后端程序中定义好的signalR消息的methodName就可以了

hubConnection.on("getRoomMessageNotification", (n: MessageItemDto) => {console.info(n.msg)if (ChatModule.currentChannel._id != n.rid) {ChatModule.increaseChannelUnread(n.rid);} else {if (n.t == null) {n.from =n.u.username == UserModule.userName? constant.MSG_FROM_SELF: constant.MSG_FROM_OPPOSITE;} else {n.from = constant.MSG_FROM_SYSTEM;}ChatModule.appendMessage(n);}
});hubConnection.on("getRoomSubscriptionChangedNotification", (n) => {console.info(n.method, n.msg)if (n.method == "insert") {console.info(n.msg + "has been inserted!");ChatModule.insertChannel(n.msg);}else if (n.method == "update") {}
});

至此，完成了所有的集成工作。

此文目的是介绍一种思路，使用缓存生命周期管理的相关机制，规避第三方用户系统对现有项目的用户系统的影响。举一反三，可以用到其他Paas的方案集成中。最近ChatGPT很火，可惜没时间研究怎么接入，有闲工夫的同学们可以尝试着写一个ChatGPT聊天机器人，欢迎大家评论留言！

最终效果如图

项目地址

Github:matoapp-samples