AcaMate_API/Program/Common/Chat/ChatHub.cs

using Microsoft.AspNetCore.SignalR;
using System.Threading.Tasks;

namespace AcaMate.Common.Chat;

public class ChatHub : Hub
{
    // 클라이언트에서 메시지를 보내면 모든 사용자에게 전송
    public async Task SendMessage(string user, string message)
    {
        Console.WriteLine($"Message received: {user}: {message}");
        await Clients.All.SendAsync("ReceiveMessage", user, message);
        
    }

    // 특정 사용자에게 메시지를 보냄
    public async Task SendMessageToUser(string connectionId, string message)
    {
        await Clients.Client(connectionId).SendAsync("ReceiveMessage", message);
    }

    // 클라이언트가 연결될 때 호출
    public override async Task OnConnectedAsync()
    {
        await Clients.Caller.SendAsync("ReceiveMessage", "System", $"Welcome! Your ID: {Context.ConnectionId}");
        Console.WriteLine("OnConnectedAsync");
        await base.OnConnectedAsync();
    }

    // 클라이언트가 연결 해제될 때 호출
    public override async Task OnDisconnectedAsync(Exception? exception)
    {
        await Clients.All.SendAsync("ReceiveMessage", "System", $"{Context.ConnectionId} disconnected");
        Console.WriteLine("OnDisconnectedAsync");
        await base.OnDisconnectedAsync(exception);
    }
}