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/Interface/Services/ICacheService.cs

@@ -0,0 +1,49 @@
+using IM_API.Models;
+
+namespace IM_API.Interface.Services
+{
+    public interface ICacheService
+    {
+        /// <summary>
+        /// 设置缓存
+        /// </summary>
+        /// <typeparam name="T">缓存对象类型</typeparam>
+        /// <param name="key">缓存索引值</param>
+        /// <param name="value">要缓存的对象</param>
+        /// <param name="expiration">过期时间</param>
+        /// <returns></returns>
+        Task SetAsync<T>(string key, T value, TimeSpan? expiration = null);
+        /// <summary>
+        /// 获取缓存
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="key">缓存索引</param>
+        /// <returns></returns>
+        Task<T?> GetAsync<T>(string key);
+        /// <summary>
+        /// 删除缓存
+        /// </summary>
+        /// <param name="key">缓存索引</param>
+        /// <returns></returns>
+        Task RemoveAsync(string key);
+        /// <summary>
+        /// 设置用户缓存
+        /// </summary>
+        /// <param name="user"></param>
+        /// <returns></returns>
+        Task SetUserCacheAsync(User user);
+        /// <summary>
+        /// 通过用户名获取用户缓存
+        /// </summary>
+        /// <param name="username"></param>
+        /// <returns></returns>
+        Task<User?> GetUserCacheAsync(string username);
+        /// <summary>
+        /// 删除用户缓存
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="username"></param>
+        /// <returns></returns>
+        Task RemoveUserCacheAsync(string username);
+    }
+}

backend/IM_API/Interface/Services/IConversationService.cs

@@ -1,5 +1,6 @@
 using IM_API.Dtos.Conversation;
 using IM_API.Models;
+using IM_API.VOs.Conversation;
 
 namespace IM_API.Interface.Services
 {
@@ -22,7 +23,7 @@ namespace IM_API.Interface.Services
         /// </summary>
         /// <param name="userId">用户id</param>
         /// <returns></returns>
-        Task<List<ConversationDto>> GetConversationsAsync(int userId);
+        Task<List<ConversationVo>> GetConversationsAsync(int userId);
         /// <summary>
         /// 获取指定用户的所有推送标识符
         /// </summary>
@@ -34,7 +35,7 @@ namespace IM_API.Interface.Services
         /// </summary>
         /// <param name="conversationId"></param>
         /// <returns></returns>
-        Task<ConversationDto> GetConversationByIdAsync(int userId, int conversationId);
+        Task<ConversationVo> GetConversationByIdAsync(int userId, int conversationId);
         /// <summary>
         /// 清空未读消息
         /// </summary>
@@ -50,5 +51,6 @@ namespace IM_API.Interface.Services
         /// <param name="chatType"></param>
         /// <returns></returns>
         Task MakeConversationAsync(int userAId, int userBId, ChatType chatType);
+        Task UpdateConversationAfterSentAsync(UpdateConversationDto dto);
     }
 }

backend/IM_API/Interface/Services/IGroupService.cs

@@ -11,14 +11,14 @@ namespace IM_API.Interface.Services
         /// <param name="groupId">群ID</param>
         /// <param name="userIds">邀请的用户列表</param>
         /// <returns></returns>
-        Task InviteUsers(int userId,int groupId, List<int> userIds);
+        Task InviteUsersAsync(int userId,int groupId, List<int> userIds);
         /// <summary>
         /// 加入群聊
         /// </summary>
         /// <param name="userId">操作者ID</param>
         /// <param name="groupId">群ID</param>
         /// <returns></returns>
-        Task JoinGroup(int userId,int groupId);
+        Task JoinGroupAsync(int userId,int groupId);
         /// <summary>
         /// 创建群聊
         /// </summary>
@@ -26,14 +26,22 @@ namespace IM_API.Interface.Services
         /// <param name="groupCreateDto">群信息</param>
         /// <param name="userIds">邀请用户列表</param>
         /// <returns></returns>
-        Task<GroupInfoDto> CreateGroup(int userId, GroupCreateDto groupCreateDto, List<int> userIds);
+        Task<GroupInfoDto> CreateGroupAsync(int userId, GroupCreateDto groupCreateDto);
         /// <summary>
         /// 删除群
         /// </summary>
         /// <param name="userId">操作者ID</param>
         /// <param name="groupId">群ID</param>
         /// <returns></returns>
-        Task DeleteGroup(int userId, int groupId);
-        //Task UpdateGroupAuthori
+        Task DeleteGroupAsync(int userId, int groupId);
+        /// <summary>
+        /// 获取当前用户群列表
+        /// </summary>
+        /// <param name="userId">操作者ID</param>
+        /// <param name="page"></param>
+        /// <param name="limit"></param>
+        /// <param name="desc"></param>
+        /// <returns></returns>
+        Task<List<GroupInfoDto>> GetGroupListAsync(int userId, int page, int limit, bool desc);
     }
 }

backend/IM_API/Interface/Services/IMessageSevice.cs

@@ -1,4 +1,7 @@
 using IM_API.Dtos;
+using IM_API.Dtos.Message;
+using IM_API.Models;
+using IM_API.VOs.Message;
 
 namespace IM_API.Interface.Services
 {
@@ -11,7 +14,7 @@ namespace IM_API.Interface.Services
         /// <param name="receiverId">接收人</param>
         /// <param name="dto"></param>
         /// <returns></returns>
-        Task<MessageBaseDto> SendPrivateMessageAsync(int senderId,int receiverId,MessageBaseDto dto);
+        Task<MessageBaseVo> SendPrivateMessageAsync(int senderId,int receiverId,MessageBaseDto dto);
         /// <summary>
         /// 发送群聊消息
         /// </summary>
@@ -19,16 +22,21 @@ namespace IM_API.Interface.Services
         /// <param name="groupId">接收群id</param>
         /// <param name="dto"></param>
         /// <returns></returns>
-        Task<MessageBaseDto> SendGroupMessageAsync(int senderId,int groupId,MessageBaseDto dto);
+        Task<MessageBaseVo> SendGroupMessageAsync(int senderId,int groupId,MessageBaseDto dto);
         /// <summary>
-        /// 获取消息列表
+        /// 消息入库
+        /// </summary>
+        /// <param name="message"></param>
+        /// <returns></returns>
+        Task MakeMessageAsync(Message message);
+        /// <summary>
+        /// 获取历史消息列表
         /// </summary>
         /// <param name="conversationId">会话id（用于获取指定用户间聊天消息）</param>
-        /// <param name="msgId">消息id</param>
+        /// <param name="sequenceId">消息id</param>
         /// <param name="pageSize">获取消息数量</param>
-        /// <param name="desc"></param>
         /// <returns></returns>
-        Task<List<MessageBaseDto>> GetMessagesAsync(int userId, int conversationId,int? msgId,int? pageSize,bool desc);
+        Task<List<MessageBaseVo>> GetMessagesAsync(int userId,MessageQueryDto dto);
         /// <summary>
         /// 获取未读消息数
         /// </summary>

backend/IM_API/Interface/Services/ISequenceIdService.cs

@@ -0,0 +1,12 @@
+namespace IM_API.Interface.Services
+{
+    public interface ISequenceIdService
+    {
+        /// <summary>
+        /// 创建消息序号
+        /// </summary>
+        /// <param name="streamKey">聊天唯一标识/param>
+        /// <returns></returns>
+        Task<long> GetNextSquenceIdAsync(string streamKey);
+    }
+}