feat(bot): store command message info in redis

PluralKit.Bot/Services/CommandMessageService.cs

@@ -8,16 +8,13 @@ namespace PluralKit.Bot;
 
 public class CommandMessageService
 {
-    private readonly IClock _clock;
-    private readonly IDatabase _db;
+    private readonly RedisService _redis;
     private readonly ILogger _logger;
-    private readonly ModelRepository _repo;
+    private static readonly TimeSpan CommandMessageRetention = TimeSpan.FromHours(24);
 
-    public CommandMessageService(IDatabase db, ModelRepository repo, IClock clock, ILogger logger)
+    public CommandMessageService(RedisService redis, IClock clock, ILogger logger)
     {
-        _db = db;
-        _repo = repo;
-        _clock = clock;
+        _redis = redis;
         _logger = logger.ForContext<CommandMessageService>();
     }
 
@@ -27,9 +24,18 @@ public class CommandMessageService
             "Registering command response {MessageId} from author {AuthorId} in {ChannelId}",
             messageId, authorId, channelId
         );
-        await _repo.SaveCommandMessage(messageId, channelId, authorId);
+
+        await _redis.Connection.GetDatabase().StringSetAsync(messageId.ToString(), $"{authorId}-{channelId}", expiry: CommandMessageRetention);
     }
 
-    public async Task<CommandMessage?> GetCommandMessage(ulong messageId) =>
-        await _repo.GetCommandMessage(messageId);
+    public async Task<(ulong?, ulong?)> GetCommandMessage(ulong messageId)
+    {
+        var str = await _redis.Connection.GetDatabase().StringGetAsync(messageId.ToString());
+        if (str.HasValue)
+        {
+            var split = ((string)str).Split("-");
+            return (ulong.Parse(split[0]), ulong.Parse(split[1]));
+        }
+        return (null, null);
+    }
 }