Fixes to .xprr, leveling system

src/NadekoBot/Migrations/20170911200031_lastXpGain.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace NadekoBot.Migrations
+{
+    public partial class lastXpGain : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<DateTime>(
+                name: "LastXpGain",
+                table: "DiscordUser",
+                nullable: false,
+                defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified));
+
+            migrationBuilder.Sql("DELETE FROM XpRoleReward WHERE XpSettingsId is null");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "LastXpGain",
+                table: "DiscordUser");
+        }
+    }
+}

src/NadekoBot/Migrations/NadekoSqliteContextModelSnapshot.cs

@@ -464,7 +464,9 @@ namespace NadekoBot.Migrations
 
                     b.Property<DateTime>("LastLevelUp")
                         .ValueGeneratedOnAdd()
-                        .HasDefaultValue(new DateTime(2017, 9, 9, 1, 7, 29, 857, DateTimeKind.Local));
+                        .HasDefaultValue(new DateTime(2017, 9, 11, 22, 0, 31, 236, DateTimeKind.Local));
+
+                    b.Property<DateTime>("LastXpGain");
 
                     b.Property<int>("NotifyOnLevelUp");
 
@@ -1360,7 +1362,7 @@ namespace NadekoBot.Migrations
 
                     b.Property<DateTime>("LastLevelUp")
                         .ValueGeneratedOnAdd()
-                        .HasDefaultValue(new DateTime(2017, 9, 9, 1, 7, 29, 858, DateTimeKind.Local));
+                        .HasDefaultValue(new DateTime(2017, 9, 11, 22, 0, 31, 238, DateTimeKind.Local));
 
                     b.Property<int>("NotifyOnLevelUp");
 

src/NadekoBot/Modules/Xp/Services/XpService.cs

@@ -131,8 +131,6 @@ namespace NadekoBot.Modules.Xp.Services
                     if (toAddTo.Count == 0)
                         return;
 
-                    _log.Info("Adding XP to {0} users.", toAddTo.Count);
-
                     using (var uow = _db.UnitOfWork)
                     {
                         foreach (var item in group)
@@ -142,6 +140,11 @@ namespace NadekoBot.Modules.Xp.Services
                             var usr = uow.Xp.GetOrCreateUser(item.Key.GuildId, item.Key.User.Id);
                             var du = uow.DiscordUsers.GetOrCreate(item.Key.User);
 
+                            if (du.LastXpGain + TimeSpan.FromMinutes(_bc.BotConfig.XpMinutesTimeout) > DateTime.UtcNow)
+                                continue;
+
+                            du.LastXpGain = DateTime.UtcNow;
+
                             var globalXp = uow.Xp.GetTotalUserXp(item.Key.User.Id);
                             var oldGlobalLevelData = new LevelStats(globalXp);
                             var newGlobalLevelData = new LevelStats(globalXp + xp);
@@ -239,6 +242,9 @@ namespace NadekoBot.Modules.Xp.Services
                 }
             }, null, TimeSpan.FromSeconds(5), TimeSpan.FromSeconds(5));
 
+
+            //just a first line, in order to prevent queries. But since other shards can try to do this too,
+            //i'll check in the db too.
             var clearRewardTimer = Task.Run(async () =>
             {
                 while (true)
@@ -268,10 +274,16 @@ namespace NadekoBot.Modules.Xp.Services
 
                 if (roleId == null)
                 {
-                    settings.RoleRewards.RemoveWhere(x => x.Level == level);
+                    var toRemove = settings.RoleRewards.FirstOrDefault(x => x.Level == level);
+                    if (toRemove != null)
+                    {
+                        uow._context.Remove(toRemove);
+                        settings.RoleRewards.Remove(toRemove);
+                    }
                 }
                 else
                 {
+
                     var rew = settings.RoleRewards.FirstOrDefault(x => x.Level == level);
 
                     if (rew != null)
@@ -553,7 +565,7 @@ namespace NadekoBot.Modules.Xp.Services
             _timeFont = _fonts.Find("Whitney-Bold").CreateFont(20);
         }
 
-        public async Task<Image<Rgba32>> GenerateImageAsync(FullUserStats stats)
+        public Task<Image<Rgba32>> GenerateImageAsync(FullUserStats stats) => Task.Run(async () =>
         {
             var img = Image.Load(_images.XpCard.ToArray());
 
@@ -717,7 +729,7 @@ namespace NadekoBot.Modules.Xp.Services
             //_log.Info("{0:F2} KB", arr.Length * 1.0f / 1.KB());
 
             return img;
-        }
+        });
 
 
         // https://github.com/SixLabors/ImageSharp/tree/master/samples/AvatarWithRoundedCorner

src/NadekoBot/Services/Database/Models/DiscordUser.cs

@@ -11,6 +11,7 @@ namespace NadekoBot.Services.Database.Models
         
         public ClubInfo Club { get; set; }
         public DateTime LastLevelUp { get; set; } = DateTime.UtcNow;
+        public DateTime LastXpGain { get; set; } = DateTime.MinValue;
         public XpNotificationType NotifyOnLevelUp { get; set; }
 
         public override bool Equals(object obj)