Add ConfigVerifier cog.

Adds ConfigVerifier which verifies channels when loaded.

2 files changed, 41 insertions, 0 deletions

diff --git a/bot/__main__.py b/bot/__main__.py
index 490163739..79f89b467 100644
--- a/bot/__main__.py
+++ b/bot/__main__.py
@@ -31,6 +31,7 @@ bot.load_extension("bot.cogs.error_handler")
 bot.load_extension("bot.cogs.filtering")
 bot.load_extension("bot.cogs.logging")
 bot.load_extension("bot.cogs.security")
+bot.load_extension("bot.cogs.config_verifier")
 
 # Commands, etc
 bot.load_extension("bot.cogs.antimalware")
diff --git a/bot/cogs/config_verifier.py b/bot/cogs/config_verifier.py
new file mode 100644
index 000000000..f0aaa06ea
--- /dev/null
+++ b/bot/cogs/config_verifier.py
@@ -0,0 +1,40 @@
+import logging
+
+from discord.ext.commands import Cog
+
+from bot import constants
+from bot.bot import Bot
+
+
+log = logging.getLogger(__name__)
+
+
+class ConfigVerifier(Cog):
+    """Verify config on startup."""
+
+    def __init__(self, bot: Bot):
+        self.bot = bot
+        self.bot.loop.create_task(self.verify_channels())
+
+    async def verify_channels(self) -> None:
+        """
+        Verifies channels in config.
+
+        If any channels in config aren't present in server, log them in a warning.
+        """
+        await self.bot.wait_until_ready()
+        server = self.bot.get_guild(constants.Guild.id)
+
+        server_channel_ids = {channel.id for channel in server.channels}
+        invalid_channels = [
+            channel_name for channel_name, channel_id in constants.Channels
+            if channel_id not in server_channel_ids
+        ]
+
+        if invalid_channels:
+            log.warning(f"Channels do not exist in server: {', '.join(invalid_channels)}.")
+
+
+def setup(bot: Bot) -> None:
+    """Load the ConfigVerifier cog."""
+    bot.add_cog(ConfigVerifier(bot))