89 lines
3.4 KiB
C#
89 lines
3.4 KiB
C#
using AutoMapper;
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using IM_API.Application.Interfaces;
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using IM_API.Domain.Events;
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using IM_API.Dtos;
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using IM_API.Exceptions;
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using IM_API.Interface.Services;
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using IM_API.Models;
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using IM_API.Services;
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using IM_API.Tools;
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using Microsoft.EntityFrameworkCore;
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using Newtonsoft.Json;
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namespace IM_API.Application.EventHandlers
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{
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public class ConversationEventHandler : IEventHandler<MessageCreatedEvent>
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{
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private readonly IConversationService _conversationService;
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private readonly ILogger<ConversationEventHandler> _logger;
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private readonly ImContext _context;
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private readonly IMapper _mapper;
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public ConversationEventHandler(
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IConversationService conversationService,
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ILogger<ConversationEventHandler> logger,
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ImContext imContext,
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IMapper mapper
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)
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{
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_conversationService = conversationService;
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_logger = logger;
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_context = imContext;
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_mapper = mapper;
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}
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/*
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* 此方法有并发问题，当双方同时第一次发送消息时，
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* 会出现同时创建的情况，其中一方会报错，
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* 导致也未走到更新逻辑，会话丢失
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*/
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public async Task Handle(MessageCreatedEvent @event)
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{
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//此处仅处理私聊会话创建
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if (@event.ChatType == ChatType.GROUP)
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{
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return;
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}
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var conversation = await _context.Conversations.FirstOrDefaultAsync(
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x => x.UserId == @event.MsgSenderId && x.TargetId == @event.MsgRecipientId
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);
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//如果首次发消息则创建双方会话
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if (conversation is null)
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{
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Conversation senderCon = _mapper.Map<Conversation>(@event);
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Conversation ReceptCon = _mapper.Map<Conversation>(@event);
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ReceptCon.UserId = @event.MsgRecipientId;
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ReceptCon.TargetId = @event.MsgSenderId;
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ReceptCon.UnreadCount += 1;
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ReceptCon.LastReadMessageId = null;
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_context.Conversations.AddRange(senderCon,ReceptCon);
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await _context.SaveChangesAsync();
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}
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else
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{
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Conversation senderCon = conversation;
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Conversation? ReceptCon = await _context.Conversations.FirstOrDefaultAsync(
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x => x.UserId == @event.MsgRecipientId && x.TargetId == @event.MsgSenderId);
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if (ReceptCon is null)
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{
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_logger.LogError("ConversationEventHandlerError：接收者会话对象缺失！Event:{Event}", JsonConvert.SerializeObject(@event));
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throw new BaseException(CodeDefine.SYSTEM_ERROR);
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}
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//更新发送者conversation
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senderCon.UnreadCount = 0;
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senderCon.LastReadMessageId = @event.MessageId;
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senderCon.LastMessage = @event.MessageContent;
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senderCon.LastMessageTime = DateTime.Now;
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//更新接收者conversation
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ReceptCon.UnreadCount += 1;
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ReceptCon.LastMessage = @event.MessageContent;
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senderCon.LastMessageTime = DateTime.Now;
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_context.Conversations.UpdateRange(senderCon, ReceptCon);
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await _context.SaveChangesAsync();
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}
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}
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}
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}
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