Created VotesApi project nad re-worked vote rewards handling

src/NadekoBot.VotesApi/Services/FileVotesCache.cs

@@ -0,0 +1,105 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using System.Threading;
+using MorseCode.ITask;
+
+namespace NadekoBot.VotesApi.Services
+{
+    public class FileVotesCache : IVotesCache
+    {
+        private const string statsFile = "store/stats.json";
+        private const string topggFile = "store/topgg.json";
+        private const string discordsFile = "store/discords.json";
+
+        private readonly SemaphoreSlim locker = new SemaphoreSlim(1, 1);
+
+        public FileVotesCache()
+        {
+            if (!Directory.Exists("store"))
+                Directory.CreateDirectory("store");
+            
+            if(!File.Exists(topggFile))
+                File.WriteAllText(topggFile, "[]");
+            
+            if(!File.Exists(discordsFile))
+                File.WriteAllText(discordsFile, "[]");
+        }
+
+        public ITask AddNewTopggVote(string userId)
+        {
+            return AddNewVote(topggFile, userId);
+        }
+        
+        public ITask AddNewDiscordsVote(string userId)
+        {
+            return AddNewVote(discordsFile, userId);
+        }
+
+        private async ITask AddNewVote(string file, string userId)
+        {
+            await locker.WaitAsync();
+            try
+            {
+                var votes = await GetVotesAsync(file);
+                votes.Add(userId);
+                await File.WriteAllTextAsync(file , JsonSerializer.Serialize(votes));
+            }
+            finally
+            {
+                locker.Release();
+            }
+        }
+
+        public async ITask<IList<Vote>> GetNewTopGgVotesAsync()
+        {
+            var votes = await EvictTopggVotes();
+            return votes;
+        }
+
+        public async ITask<IList<Vote>> GetNewDiscordsVotesAsync()
+        {
+            var votes = await EvictDiscordsVotes();
+            return votes;
+        }
+
+        private ITask<List<Vote>> EvictTopggVotes()
+            => EvictVotes(topggFile);
+
+        private ITask<List<Vote>> EvictDiscordsVotes()
+            => EvictVotes(discordsFile);
+
+        private async ITask<List<Vote>> EvictVotes(string file)
+        {
+            await locker.WaitAsync();
+            try
+            {
+
+                var ids = await GetVotesAsync(file);
+                await File.WriteAllTextAsync(file, "[]");
+                
+                return ids?
+                    .Select(x => (Ok: ulong.TryParse(x, out var r), Id: r))
+                    .Where(x => x.Ok)
+                    .Select(x => new Vote
+                    {
+                        UserId = x.Id
+                    })
+                    .ToList();
+            }
+            finally
+            {
+                locker.Release();
+            }
+        }
+
+        private async ITask<IList<string>> GetVotesAsync(string file)
+        {
+            await using var fs = File.Open(file, FileMode.Open);
+            var votes = await JsonSerializer.DeserializeAsync<List<string>>(fs);
+            return votes;
+        }
+    }
+}