Add InitLottery()

Stratis.Guru/Models/LotterySetting.cs

+using MongoDB.Bson;
+using MongoDB.Bson.Serialization.Attributes;
+
+namespace Stratis.Guru.Services
+{
+    public class LotterySetting
+    {
+        [BsonId]
+        public ObjectId Id { get; set; }
+        public int PublicKeyIterator { get; set; }
+    }
+}
\ No newline at end of file

Stratis.Guru/Services/LotteryService.cs

@@ -21,9 +21,26 @@ namespace Stratis.Guru.Services
 
         public async Task StartAsync(CancellationToken cancellationToken)
         {
+            await InitLottery();
             await CalculateNextDrawAsync();
         }
 
+        private async Task InitLottery()
+        {
+            #region use DI
+            var client = new MongoClient("mongodb://localhost:27017");
+            var database = client.GetDatabase("stratis-guru");
+            var collection = database.GetCollection<LotterySetting>("lottery");
+            if(!collection.Find(x => true).Any())
+            {
+                await collection.InsertOneAsync(new LotterySetting()
+                {
+                    PublicKeyIterator = 0
+                });
+            }
+            #endregion
+        }
+
         private async Task CalculateNextDrawAsync()
         {
             DateTime today = DateTime.Today;