Cache info about users, cleanup for module

Core/Startup.cs

@@ -1,4 +1,5 @@
 using BotFramework;
+using Kruzya.TelegramBot.Core.Cache;
 using Kruzya.TelegramBot.Core.Data;
 using Kruzya.TelegramBot.Core.Extensions;
 using Microsoft.AspNetCore.Builder;
@@ -7,6 +8,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
+using Telegram.Bot.Types;
 
 namespace Kruzya.TelegramBot.Core
 {
@@ -36,6 +38,9 @@ namespace Kruzya.TelegramBot.Core
             services.AddDbContext<CoreContext>(ctx =>
                 ctx.UseMySql(connectionString, ServerVersion.AutoDetect(connectionString)));
 
+            // Cache for users.
+            services.AddSingleton<ICacheStorage<long, User>, MemoryCache<long, User>>();
+
             // Trigger module handlers.
             _core.Modules.ConfigureServices(services);
         }

modules/UserGroupTag/Handler.cs

@@ -8,9 +8,11 @@ using BotFramework.Attributes;
 using BotFramework.Enums;
 using BotFramework.Utils;
 using Castle.Core.Internal;
+using Kruzya.TelegramBot.Core.Cache;
 using Kruzya.TelegramBot.Core.Data;
 using Kruzya.TelegramBot.Core.Extensions;
 using Telegram.Bot;
+using Telegram.Bot.Types;
 using Telegram.Bot.Types.Enums;
 
 namespace UserGroupTag
@@ -18,16 +20,17 @@ namespace UserGroupTag
     public class Handler : BotEventHandler
     {
         private readonly CoreContext _db;
+        private readonly ICacheStorage<long, User> _userCache;
 
-        public Handler(CoreContext db)
+        public Handler(CoreContext db, ICacheStorage<long, User> userCache)
         {
             _db = db;
+            _userCache = userCache;
         }
         
         [ParametrizedCommand(InChat.Public, "add_group", CommandParseMode.Both)]
         public async Task HandleAddGroup(string groupName)
         {
-            Console.WriteLine("add_group");
             // var groupName = group.Text;
             
             var repliedMessage = RawUpdate.Message!.ReplyToMessage;
@@ -56,6 +59,7 @@ namespace UserGroupTag
             userGroupOption.SetValue(tagDictionary);
             _db.MarkAsModified(userGroupOption);
 
+            _userCache.SetValue(repliedMessage.From.Id, repliedMessage.From, Int32.MaxValue);
             await Bot.SendTextMessageAsync(chatId, $"{from.ToHtml()} добавлен в группу {groupName}", 
                 ParseMode.Html);
         }
@@ -79,13 +83,25 @@ namespace UserGroupTag
             var msg = new HtmlString()
                 .Text("Пользователь ")
                 .UserMention(From)
-                .Text(" охуел и хочет доебаться к: ");
+                .Text($" призывает группу пользователей {groupName}: ");
             foreach (var userId in userList)
             {
-                msg.User(userId, userId.ToString()).Text(", ");
+                msg.UserMention(await GetUser(userId, Chat)).Text(", ");
             }
 
             await Bot.SendTextMessageAsync(Chat.Id, msg.ToString().TrimEnd(',', ' '), ParseMode.Html);
         }
+
+        protected async Task<User> GetUser(long userId, Chat chat)
+        {
+            User user;
+            if (!_userCache.TryGetValue(userId, out user))
+            {
+                user = (await Bot.GetChatMemberAsync(Chat, userId)).User;
+                _userCache.SetValue(userId, user, Int32.MaxValue);
+            }
+
+            return user;
+        }
     }
 }