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import sys
import traceback
import math
import logging
from discord.ext import commands
class CommandErrorHandler:
"""A error handler for the PythonDiscord server!"""
def __init__(self, bot):
self.bot = bot
async def on_command_error(self, ctx, error):
"""Activates when a command opens an error"""
if hasattr(ctx.command, 'on_error'):
return logging.debug(
"A command error occured but " +
"the command had it's own error handler"
)
error = getattr(error, 'original', error)
if isinstance(error, commands.CommandNotFound):
return logging.debug(
f"{ctx.author} called '{ctx.message.content}' " +
"but no command was found"
)
if isinstance(error, commands.UserInputError):
logging.debug(
f"{ctx.author} called the command '{ctx.command}' " +
"but entered invalid input!"
)
return await ctx.send(
":no_entry: The command you specified failed to run." +
"This is because the arguments you provided were invalid."
)
if isinstance(error, commands.CommandOnCooldown):
logging.debug(
f"{ctx.author} called the command '{ctx.command}' " +
"but they were on cooldown!"
)
return await ctx.send(
"This command is on cooldown," +
" please retry in {}s.".format(math.ceil(error.retry_after))
)
if isinstance(error, commands.DisabledCommand):
logging.debug(
f"{ctx.author} called the command '{ctx.command}' " +
"but the command was disabled!"
)
return await ctx.send(
":no_entry: This command has been disabled."
)
if isinstance(error, commands.NoPrivateMessage):
logging.debug(
f"{ctx.author} called the command '{ctx.command}' " +
"in a private message however the command was guild only!"
)
return await ctx.author.send(
":no_entry: This command can only be used inside a server."
)
if isinstance(error, commands.BadArgument):
if ctx.command.qualified_name == 'tag list':
logging.debug(
f"{ctx.author} called the command '{ctx.command}' " +
"but entered an invalid user!"
)
return await ctx.send(
"I could not find that member. Please try again."
)
else:
logging.debug(
f"{ctx.author} called the command '{ctx.command}' " +
"but entered a bad argument!"
)
return await ctx.send(
"The argument you provided was invalid."
)
if isinstance(error, commands.CheckFailure):
logging.debug(
f"{ctx.author} called the command '{ctx.command}' " +
"but the checks failed!"
)
return await ctx.send(
":no_entry: You are not authorized to use this command."
)
print(
"Ignoring exception in command {}:".format(ctx.command),
file=sys.stderr
)
logging.warning(
f"{ctx.author} called the command '{ctx.command}' " +
"however the command failed to run with the error:" +
f"-------------\n{error}"
)
traceback.print_exception(
type(error),
error,
error.__traceback__,
file=sys.stderr
)
def setup(bot):
bot.add_cog(CommandErrorHandler(bot))
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