sharp-chat/SharpChat/C2SPacketHandlers/PingC2SPacketHandler.cs

using SharpChat.Auth;
using SharpChat.SockChat.S2CPackets;
using System.Net;

namespace SharpChat.C2SPacketHandlers;

public class PingC2SPacketHandler(AuthClient authClient) : C2SPacketHandler {
    private readonly TimeSpan BumpInterval = TimeSpan.FromMinutes(1);
    private DateTimeOffset LastBump = DateTimeOffset.MinValue;

    public bool IsMatch(C2SPacketHandlerContext ctx) {
        return ctx.CheckPacketId("0");
    }

    public async Task Handle(C2SPacketHandlerContext ctx) {
        string[] parts = ctx.SplitText(2);

        if(!int.TryParse(parts.FirstOrDefault(), out int pTime))
            return;

        ctx.Connection.BumpPing();
        await ctx.Connection.Send(new PongS2CPacket());

        ctx.Chat.ContextAccess.Wait();
        try {
            if(LastBump < DateTimeOffset.UtcNow - BumpInterval) {
                (IPAddress, string)[] bumpList = [.. ctx.Chat.Users
                    .Where(u => u.Status == UserStatus.Online && ctx.Chat.Connections.Any(c => c.User == u))
                    .Select(u => (ctx.Chat.GetRemoteAddresses(u).FirstOrDefault() ?? IPAddress.None, u.UserId))];

                if(bumpList.Length > 0)
                    await authClient.AuthBumpUsersOnlineAsync(bumpList);

                LastBump = DateTimeOffset.UtcNow;
            }
        } finally {
            ctx.Chat.ContextAccess.Release();
        }
    }
}