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前端：

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增加会话缓存
后端：
增加触发消息创建事件
增加消息创建事件触发后的处理函数
This commit is contained in:
nanxun
2026-01-20 23:09:46 +08:00
parent be621e9ae2
commit bedcf97c9d
11 changed files with 158 additions and 88 deletions
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backend/IM_API/Application/EventHandlers/ConversationEventHandler.cs
+14 -46
View File
@@ -30,58 +30,26 @@ namespace IM_API.Application.EventHandlers
_context = imContext;
_mapper = mapper;
}
/*
* 此方法有并发问题，当双方同时第一次发送消息时，
* 会出现同时创建的情况，其中一方会报错，
* 导致也未走到更新逻辑，会话丢失
*/
public async Task Handle(MessageCreatedEvent @event)
{
//此处仅处理私聊会话创建
if (@event.ChatType == ChatType.GROUP)
if(@event.ChatType == ChatType.PRIVATE)
{
return;
}
var conversation = await _context.Conversations.FirstOrDefaultAsync(
x => x.UserId == @event.MsgSenderId && x.TargetId == @event.MsgRecipientId
);
//如果首次发消息则创建双方会话
if (conversation is null)
{
Conversation senderCon = _mapper.Map<Conversation>(@event);
Conversation ReceptCon = _mapper.Map<Conversation>(@event);
ReceptCon.UserId = @event.MsgRecipientId;
ReceptCon.TargetId = @event.MsgSenderId;
ReceptCon.UnreadCount += 1;
ReceptCon.LastReadMessageId = null;
_context.Conversations.AddRange(senderCon,ReceptCon);
await _context.SaveChangesAsync();
}
else
{
Conversation senderCon = conversation;
Conversation? ReceptCon = await _context.Conversations.FirstOrDefaultAsync(
x => x.UserId == @event.MsgRecipientId && x.TargetId == @event.MsgSenderId);
if (ReceptCon is null)
Conversation? userAConversation = await _context.Conversations.FirstOrDefaultAsync(
x => x.UserId == @event.MsgSenderId && x.TargetId == @event.MsgRecipientId
);
Conversation? userBConversation = await _context.Conversations.FirstOrDefaultAsync(
x => x.UserId == @event.MsgRecipientId && x.TargetId == @event.MsgSenderId
);
if(userAConversation is null || userBConversation is null)
{
_logger.LogError("ConversationEventHandlerError：接收者会话对象缺失！Event:{Event}", JsonConvert.SerializeObject(@event));
throw new BaseException(CodeDefine.SYSTEM_ERROR);
_logger.LogError("消息事件更新会话信息失败：{@event}",@event);
}
//更新发送者conversation
senderCon.UnreadCount = 0;
senderCon.LastReadMessageId = @event.MessageId;
senderCon.LastMessage = @event.MessageContent;
senderCon.LastMessageTime = DateTime.Now;
//更新接收者conversation
ReceptCon.UnreadCount += 1;
ReceptCon.LastMessage = @event.MessageContent;
senderCon.LastMessageTime = DateTime.Now;
_context.Conversations.UpdateRange(senderCon, ReceptCon);
userAConversation.LastMessage = @event.MessageContent;
userAConversation.LastReadMessageId = @event.MessageId;
userBConversation.LastMessage = @event.MessageContent;
userBConversation.UnreadCount += 1;
_context.UpdateRange(userAConversation,userBConversation);
await _context.SaveChangesAsync();
}
}
}
backend/IM_API/Application/EventHandlers/SignalREventHandler.cs
+12 -4
View File
@@ -1,6 +1,9 @@
using IM_API.Application.Interfaces;
using AutoMapper;
using IM_API.Application.Interfaces;
using IM_API.Domain.Events;
using IM_API.Dtos;
using IM_API.Hubs;
using IM_API.Models;
using IM_API.Tools;
using Microsoft.AspNetCore.SignalR;
@@ -9,15 +12,20 @@ namespace IM_API.Application.EventHandlers
public class SignalREventHandler : IEventHandler<MessageCreatedEvent>
{
private readonly IHubContext<ChatHub> _hub;
public SignalREventHandler(IHubContext<ChatHub> hub)
private readonly IMapper _mapper;
public SignalREventHandler(IHubContext<ChatHub> hub, IMapper mapper)
{
_hub = hub;
_mapper = mapper;
}
public async Task Handle(MessageCreatedEvent @event)
{
var streamKey = @event.StreamKey;
await _hub.Clients.Group(streamKey).SendAsync(SignalRMethodDefine.ReceiveMessage, @event);
if(@event.ChatType == Models.ChatType.PRIVATE)
{
MessageBaseDto messageBaseDto = _mapper.Map<MessageBaseDto>(_mapper.Map<Message>(@event));
await _hub.Clients.Users(@event.MsgRecipientId.ToString()).SendAsync("ReceiveMessage", messageBaseDto);
}
}
}
}