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import contextlib
import logging
from discord.ext.commands import (
BadArgument,
BotMissingPermissions,
CheckFailure,
CommandError,
CommandInvokeError,
CommandNotFound,
CommandOnCooldown,
DisabledCommand,
MissingPermissions,
NoPrivateMessage,
UserInputError,
)
from discord.ext.commands import Bot, Context
from bot.api import ResponseCodeError
from bot.constants import Channels
log = logging.getLogger(__name__)
class ErrorHandler:
"""Handles errors emitted from commands."""
def __init__(self, bot: Bot):
self.bot = bot
async def on_command_error(self, ctx: Context, e: CommandError):
command = ctx.command
parent = None
if command is not None:
parent = command.parent
# Retrieve the help command for the invoked command.
if parent and command:
help_command = (self.bot.get_command("help"), parent.name, command.name)
elif command:
help_command = (self.bot.get_command("help"), command.name)
else:
help_command = (self.bot.get_command("help"),)
cog_has_handler = command and hasattr(ctx.cog, f"_{command.cog_name}__error")
if hasattr(command, "on_error") or cog_has_handler:
log.debug(f"Command {command} has a local error handler; ignoring.")
return
# Try to look for a tag with the command's name if the command isn't found.
if isinstance(e, CommandNotFound) and not hasattr(ctx, "invoked_from_error_handler"):
if not ctx.channel.id == Channels.verification:
tags_get_command = self.bot.get_command("tags get")
ctx.invoked_from_error_handler = True
# Return to not raise the exception
with contextlib.suppress(ResponseCodeError):
return await ctx.invoke(tags_get_command, tag_name=ctx.invoked_with)
elif isinstance(e, BadArgument):
await ctx.send(f"Bad argument: {e}\n")
await ctx.invoke(*help_command)
elif isinstance(e, UserInputError):
await ctx.send("Something about your input seems off. Check the arguments:")
await ctx.invoke(*help_command)
log.debug(
f"Command {command} invoked by {ctx.message.author} with error "
f"{e.__class__.__name__}: {e}"
)
elif isinstance(e, NoPrivateMessage):
await ctx.send("Sorry, this command can't be used in a private message!")
elif isinstance(e, BotMissingPermissions):
await ctx.send(f"Sorry, it looks like I don't have the permissions I need to do that.")
log.warning(
f"The bot is missing permissions to execute command {command}: {e.missing_perms}"
)
elif isinstance(e, MissingPermissions):
log.debug(
f"{ctx.message.author} is missing permissions to invoke command {command}: "
f"{e.missing_perms}"
)
elif isinstance(e, (CheckFailure, CommandOnCooldown, DisabledCommand)):
log.debug(
f"Command {command} invoked by {ctx.message.author} with error "
f"{e.__class__.__name__}: {e}"
)
elif isinstance(e, CommandInvokeError):
if isinstance(e.original, ResponseCodeError):
status = e.original.response.status
if status == 404:
await ctx.send("There does not seem to be anything matching your query.")
elif status == 400:
content = await e.original.response.json()
log.debug(f"API responded with 400 for command {command}: %r.", content)
await ctx.send("According to the API, your request is malformed.")
elif 500 <= status < 600:
await ctx.send("Sorry, there seems to be an internal issue with the API.")
log.warning(f"API responded with {status} for command {command}")
else:
await ctx.send(f"Got an unexpected status code from the API (`{status}`).")
log.warning(f"Unexpected API response for command {command}: {status}")
else:
await self.handle_unexpected_error(ctx, e.original)
else:
await self.handle_unexpected_error(ctx, e)
@staticmethod
async def handle_unexpected_error(ctx: Context, e: CommandError):
await ctx.send(
f"Sorry, an unexpected error occurred. Please let us know!\n\n"
f"```{e.__class__.__name__}: {e}```"
)
log.error(
f"Error executing command invoked by {ctx.message.author}: {ctx.message.content}"
)
raise e
def setup(bot: Bot):
bot.add_cog(ErrorHandler(bot))
log.info("Cog loaded: Events")
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