Initial split of the modules

NadekoBot.Core/Modules/Administration/Services/RatelimitService.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Discord;
+using Discord.WebSocket;
+using NadekoBot.Common.ModuleBehaviors;
+using NadekoBot.Extensions;
+using NadekoBot.Modules.Administration.Common;
+using NadekoBot.Services;
+using NadekoBot.Services.Database.Models;
+using NLog;
+
+namespace NadekoBot.Modules.Administration.Services
+{
+    public class SlowmodeService : IEarlyBlocker, INService
+    {
+        public ConcurrentDictionary<ulong, Ratelimiter> RatelimitingChannels = new ConcurrentDictionary<ulong, Ratelimiter>();
+        public ConcurrentDictionary<ulong, HashSet<ulong>> IgnoredRoles = new ConcurrentDictionary<ulong, HashSet<ulong>>();
+        public ConcurrentDictionary<ulong, HashSet<ulong>> IgnoredUsers = new ConcurrentDictionary<ulong, HashSet<ulong>>();
+
+        private readonly Logger _log;
+        private readonly DiscordSocketClient _client;
+
+        public SlowmodeService(DiscordSocketClient client, IEnumerable<GuildConfig> gcs)
+        {
+            _log = LogManager.GetCurrentClassLogger();
+            _client = client;
+
+            IgnoredRoles = new ConcurrentDictionary<ulong, HashSet<ulong>>(
+                gcs.ToDictionary(x => x.GuildId,
+                                 x => new HashSet<ulong>(x.SlowmodeIgnoredRoles.Select(y => y.RoleId))));
+
+            IgnoredUsers = new ConcurrentDictionary<ulong, HashSet<ulong>>(
+                gcs.ToDictionary(x => x.GuildId,
+                                 x => new HashSet<ulong>(x.SlowmodeIgnoredUsers.Select(y => y.UserId))));
+        }
+
+        public async Task<bool> TryBlockEarly(IGuild guild, IUserMessage usrMsg)
+        {
+            if (guild == null)
+                return false;
+            try
+            {
+                var channel = usrMsg?.Channel as SocketTextChannel;
+
+                if (channel == null || usrMsg == null || usrMsg.IsAuthor(_client))
+                    return false;
+                if (!RatelimitingChannels.TryGetValue(channel.Id, out Ratelimiter limiter))
+                    return false;
+
+                if (limiter.CheckUserRatelimit(usrMsg.Author.Id, channel.Guild.Id, usrMsg.Author as SocketGuildUser))
+                {
+                    await usrMsg.DeleteAsync();
+                    return true;
+                }
+            }
+            catch (Exception ex)
+            {
+                _log.Warn(ex);
+                
+            }
+            return false;
+        }
+    }
+}