前端：

1、优化消息排序逻辑
2、新增加载历史消息
3、修复已知问题
后端：
1、优化消息排序逻辑
2、增加用户信息缓存机制
3、修改日期类型为DateTimeOffset改善时区信息丢失问题
3、修复了已知问题
数据库：
1、新增SequenceId字段用于消息排序
2、新增ClientMsgId字段用于客户端消息回执

backend/IM_API/Configs/ServiceCollectionExtensions.cs

@@ -8,6 +8,10 @@ using IM_API.Services;
 using IM_API.Tools;
 using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.AspNetCore.Mvc;
+using RedLockNet;
+using RedLockNet.SERedis;
+using RedLockNet.SERedis.Configuration;
+using StackExchange.Redis;
 
 namespace IM_API.Configs
 {
@@ -17,14 +21,23 @@ namespace IM_API.Configs
         {
             
             services.AddAutoMapper(typeof(MapperConfig));
-            services.AddTransient<IAuthService, AuthService>();
-            services.AddTransient<IUserService, UserService>();
-            services.AddTransient<IFriendSerivce, FriendService>();
-            services.AddTransient<IMessageSevice, MessageService>();
-            services.AddTransient<IConversationService, ConversationService>();
+            services.AddScoped<IAuthService, AuthService>();
+            services.AddScoped<IUserService, UserService>();
+            services.AddScoped<IFriendSerivce, FriendService>();
+            services.AddScoped<IMessageSevice, MessageService>();
+            services.AddScoped<IConversationService, ConversationService>();
+            services.AddScoped<IGroupService, GroupService>();
+            services.AddScoped<ISequenceIdService, SequenceIdService>();
+            services.AddScoped<ICacheService, RedisCacheService>();
             services.AddScoped<IEventBus, InMemoryEventBus>();
             services.AddSingleton<IJWTService, JWTService>();
             services.AddSingleton<IRefreshTokenService, RedisRefreshTokenService>();
+            services.AddSingleton<IDistributedLockFactory>(sp =>
+            {
+                var connection = sp.GetRequiredService<IConnectionMultiplexer>();
+                // 这里可以配置多个 Redis 节点提高安全性，单机运行传一个即可
+                return RedLockFactory.Create(new List<RedLockMultiplexer> { new RedLockMultiplexer(connection) });
+            });
             return services;
         }
         public static IServiceCollection AddModelValidation(this IServiceCollection services, IConfiguration configuration)
@@ -40,7 +53,7 @@ namespace IM_API.Configs
                             Field = e.Key,
                             Message = e.Value.Errors.First().ErrorMessage
                         });
-
+                    Console.WriteLine(errors);
                     return new BadRequestObjectResult(new BaseResponse<object?>(CodeDefine.PARAMETER_ERROR.Code, errors.First().Message));
                 };
             });