sharp-chat/SharpChat/PacketHandlers/PingHandler.cs

using SharpChat.Misuzu;
using SharpChat.Packet;
using System;
using System.Linq;
using System.Threading.Tasks;

namespace SharpChat.PacketHandlers {
    public class PingHandler : IPacketHandler {
        private readonly MisuzuClient Misuzu;

        private readonly TimeSpan BumpInterval = TimeSpan.FromMinutes(1);
        private DateTimeOffset LastBump = DateTimeOffset.MinValue;

        public PingHandler(MisuzuClient msz) {
            Misuzu = msz;
        }

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

        public void Handle(PacketHandlerContext ctx) {
            string[] parts = ctx.SplitText(2);

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

            ctx.Connection.BumpPing();
            ctx.Connection.Send(new PongPacket());

            ctx.Chat.ContextAccess.Wait();
            try {
                if(LastBump < DateTimeOffset.UtcNow - BumpInterval) {
                    (string, string)[] bumpList = ctx.Chat.Users.All
                        .Where(u => u.Status == UserStatus.Online && ctx.Chat.Connections.Any(c => c.User == u))
                        .Select(u => (u.UserId.ToString(), ctx.Chat.GetRemoteAddresses(u).FirstOrDefault()?.ToString() ?? string.Empty))
                        .ToArray();

                    if(bumpList.Any())
                        Task.Run(async () => {
                            await Misuzu.BumpUsersOnlineAsync(bumpList);
                        }).Wait();

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