feat: add remote config over http/redis

PluralKit.Bot/Services/RuntimeConfigService.cs

@@ -0,0 +1,58 @@
+using Newtonsoft.Json;
+
+using Serilog;
+
+using StackExchange.Redis;
+
+using PluralKit.Core;
+
+namespace PluralKit.Bot;
+
+public class RuntimeConfigService
+{
+    private readonly RedisService _redis;
+    private readonly ILogger _logger;
+
+    private Dictionary<string, string> settings = new();
+
+    private string RedisKey;
+
+    public RuntimeConfigService(ILogger logger, RedisService redis, BotConfig config)
+    {
+        _logger = logger.ForContext<RuntimeConfigService>();
+        _redis = redis;
+
+        var clusterId = config.Cluster?.NodeIndex ?? 0;
+        RedisKey = $"remote_config:dotnet_bot:{clusterId}";
+    }
+
+    public async Task LoadConfig()
+    {
+        var redisConfig = await _redis.Connection.GetDatabase().HashGetAllAsync(RedisKey);
+        foreach (var entry in redisConfig)
+            settings.Add(entry.Name, entry.Value);
+
+        var configStr = JsonConvert.SerializeObject(settings);
+        _logger.Information($"starting with runtime config: {configStr}");
+    }
+
+    public async Task Set(string key, string value)
+    {
+        await _redis.Connection.GetDatabase().HashSetAsync(RedisKey, new[] { new HashEntry(key, new RedisValue(value)) });
+        settings.Add(key, value);
+        _logger.Information($"updated runtime config: {key}={value}");
+    }
+
+    public async Task Delete(string key)
+    {
+        await _redis.Connection.GetDatabase().HashDeleteAsync(RedisKey, key);
+        settings.Remove(key);
+        _logger.Information($"updated runtime config: {key} removed");
+    }
+
+    public object? Get(string key) => settings.GetValueOrDefault(key);
+
+    public bool Exists(string key) => settings.ContainsKey(key);
+
+    public Dictionary<string, string> GetAll() => settings;
+}