From 842896642e48dfca5302c2c16ba8ddf6909896c4 Mon Sep 17 00:00:00 2001
From: Michel Roux <xefir@crystalyx.net>
Date: Tue, 7 Nov 2023 10:52:38 +0100
Subject: [PATCH] Add cache to fetch_users (closes #171)

---
 divent/bot.py | 55 ++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 41 insertions(+), 14 deletions(-)

diff --git a/divent/bot.py b/divent/bot.py
index 6492894..91af96d 100644
--- a/divent/bot.py
+++ b/divent/bot.py
@@ -3,9 +3,9 @@ import logging
 from datetime import datetime, timedelta
 from functools import wraps
 from os import getenv, path
-from typing import Dict, Optional
+from typing import Dict, Optional, Union
 
-from disnake import Asset, Client, Guild
+from disnake import Asset, Client, Guild, Intents, Member, User
 from disnake.guild_scheduled_event import GuildScheduledEvent
 from dotenv import load_dotenv
 from ics import Calendar, ContentLine, Event
@@ -36,13 +36,47 @@ API_BASE_URL = getenv("API_BASE_URL", "https://discordapp.com/api")
 AUTHORIZATION_BASE_URL = f"{API_BASE_URL}/oauth2/authorize"
 TOKEN_URL = f"{API_BASE_URL}/oauth2/token"
 
+CATALOG_CACHE = {}
+EVENTS_CACHE = {}
+
 
 class Discord(Client):
     async def on_ready(self):
         print(f"Logged on as {self.user}!", flush=True)
 
+        for guild in self.guilds:
+            for scheduled_event in guild.scheduled_events:
+                EVENTS_CACHE[scheduled_event.id] = [
+                    member.id
+                    for member in await scheduled_event.fetch_users().flatten()
+                ]
+
+        print("Events synchronised!", flush=True)
+
+    async def on_guild_scheduled_event_subscribe(
+        self, event: GuildScheduledEvent, user: Union[Member, User]
+    ):
+        EVENTS_CACHE[event.id].append(user.id)
+
+    async def on_guild_scheduled_event_unsubscribe(
+        self, event: GuildScheduledEvent, user: Union[Member, User]
+    ):
+        EVENTS_CACHE[event.id].remove(user.id)
+
+    async def on_guild_scheduled_event_create(self, event: GuildScheduledEvent):
+        EVENTS_CACHE[event.id] = [
+            member.id for member in await event.fetch_users().flatten()
+        ]
+
+    async def on_guild_scheduled_event_delete(self, event: GuildScheduledEvent):
+        EVENTS_CACHE.pop(event.id)
+
+
+intents = Intents.default()
+intents.guild_scheduled_events = True
+intents.members = True
+client = Discord(intents=intents)
 
-client = Discord()
 app = Quart(__name__)
 app.config["SECRET_KEY"] = OAUTH2_CLIENT_SECRET
 app.config["EXPLAIN_TEMPLATE_LOADING"] = QUART_DEBUG
@@ -57,9 +91,6 @@ def get_guild_by_id(guild_id: str) -> Optional[Guild]:
     return None
 
 
-CATALOG_CACHE = {}
-
-
 @app.errorhandler(500)
 async def errorhandler(error: Exception):
     print(f"\33[31m{error}\33[m", flush=True)
@@ -301,14 +332,10 @@ async def ical(entity_id: str):
         )
 
         for guild in client.guilds:
-            if await guild.get_or_fetch_member(int(entity_id)):
-                for scheduled_event in guild.scheduled_events:
-                    if any(
-                        user.id == member.id
-                        for member in await scheduled_event.fetch_users().flatten()
-                    ):
-                        event = make_event(scheduled_event)
-                        calendar.events.append(event)
+            for scheduled_event in guild.scheduled_events:
+                if user.id in EVENTS_CACHE[scheduled_event.id]:
+                    event = make_event(scheduled_event)
+                    calendar.events.append(event)
 
         return calendar.serialize()