IM/backend/IM_API/Application/EventHandlers/FriendAddHandler/FriendAddSignalRHandler.cs

using IM_API.Domain.Events;
using IM_API.Dtos;
using IM_API.Hubs;
using IM_API.Interface.Services;
using IM_API.Models;
using MassTransit;
using Microsoft.AspNetCore.SignalR;

namespace IM_API.Application.EventHandlers.FriendAddHandler
{
    public class FriendAddSignalRHandler : IConsumer<FriendAddEvent>
    {
        private readonly IHubContext<ChatHub> _chathub;
        public FriendAddSignalRHandler(IHubContext<ChatHub> chathub)
        {
            _chathub = chathub;
        }

        public async Task Consume(ConsumeContext<FriendAddEvent> context)
        {
            var @event = context.Message;
            var usersList = new List<string> { 
                @event.RequestUserId.ToString(), @event.ResponseUserId.ToString()
            };
            var res = new HubResponse<MessageBaseDto>("Event", new MessageBaseDto()
            {
                ChatType = ChatType.PRIVATE,
                Content = "您有新的好友关系已添加",
                //MsgId = @event.EventId.ToString(),
                ReceiverId = @event.ResponseUserId,
                SenderId = @event.RequestUserId,
                TimeStamp = DateTime.Now
            });
            await _chathub.Clients.Users(usersList).SendAsync("ReceiveMessage", res);
        }
    }
}