Make the bot automatically join threads

This is just a QoL of life thing, avoiding having us to check if the bot is here or not before issuing a command

Co-authored-by: ChrisJL <[email protected]>

1 files changed, 18 insertions, 2 deletions

diff --git a/bot/bot.py b/bot/bot.py
index b877233e..c7b87a65 100644
--- a/bot/bot.py
+++ b/bot/bot.py
@@ -1,14 +1,15 @@
 import asyncio
 import logging
 import socket
+from contextlib import suppress
 from typing import Optional
 
 import discord
 from aiohttp import AsyncResolver, ClientSession, TCPConnector
 from async_rediscache import RedisSession
-from discord import DiscordException, Embed
+from discord import DiscordException, Embed, Forbidden, Thread
 from discord.ext import commands
-from discord.ext.commands import when_mentioned_or
+from discord.ext.commands import Cog, when_mentioned_or
 
 from bot import constants
 
@@ -46,6 +47,21 @@ class Bot(commands.Bot):
             return None
         return guild.me
 
+    @Cog.listener()
+    async def on_thread_join(self, thread: Thread) -> None:
+        """
+        Try to join newly created threads.
+
+        Despite the event name being misleading, this is dispatched when new threads are created.
+        We want our bots to automatically join threads in order to answer commands using their prefixes.
+        """
+        if thread.me:
+            # Already in this thread, return early
+            return
+
+        with suppress(Forbidden):
+            await thread.join()
+
     async def close(self) -> None:
         """Close Redis session when bot is shutting down."""
         await super().close()