advent: increase interaction timeout and optimise

optimisation to cache image data when switching to/from full view.
this is done by lru_cache, currently with a size of 16 (enough for
8 /leaderboard calls, with 2 image each)

uqcsbot/advent.py

@@ -1,6 +1,6 @@
 import io
 import os
-from datetime import datetime
+from datetime import datetime, timedelta
 from random import choices
 from typing import Any, Callable, Dict, Iterable, List, Optional, Literal
 import requests
@@ -141,7 +141,7 @@
 
 class LeaderboardView(discord.ui.View):
     TRUNCATED_COUNT = 20
-    TIMEOUT = 180  # seconds
+    TIMEOUT = timedelta(hours=24).total_seconds()
 
     def __init__(
         self,

uqcsbot/utils/advent_utils.py

@@ -6,13 +6,14 @@
     Dict,
     Optional,
     Callable,
-    NamedTuple,
     Tuple,
     cast,
 )
+from dataclasses import dataclass
 from collections import defaultdict
 from datetime import datetime, timedelta
 from zoneinfo import ZoneInfo
+from functools import lru_cache
 from io import BytesIO
 
 import PIL.Image
@@ -33,8 +34,16 @@
 Times = Dict[Star, Seconds]
 Delta = Optional[Seconds]
 Json = Dict[str, Any]
+
 Colour = str
-ColourFragment = NamedTuple("ColourFragment", [("text", str), ("colour", Colour)])
+
+
+@dataclass(frozen=True)
+class ColourFragment:
+    text: str
+    colour: Colour
+
+
 Leaderboard = list[str | ColourFragment]
 
 # Puzzles are unlocked at midnight EST.
@@ -437,6 +446,7 @@ def _isolate_leaderboard_layers(
     return spaces_str, cast(Dict[str, Any], layers)
 
 
+@lru_cache(maxsize=16)
 def render_leaderboard_to_image(leaderboard: Leaderboard) -> bytes:
     spaces, layers = _isolate_leaderboard_layers(leaderboard)
 
@@ -462,7 +472,7 @@ def render_leaderboard_to_image(leaderboard: Leaderboard) -> bytes:
 
     buf = BytesIO()
     img.save(buf, format="PNG", optimize=True)
-    return buf.getvalue()  # XXX: why do we need to getvalue()?
+    return buf.getvalue()
 
 
 def build_leaderboard(