diff options
Diffstat (limited to '')
| -rw-r--r-- | bot/cogs/error_handler.py | 249 | ||||
| -rw-r--r-- | bot/cogs/moderation/infractions.py | 2 |
2 files changed, 149 insertions, 102 deletions
diff --git a/bot/cogs/error_handler.py b/bot/cogs/error_handler.py index 0abb7e521..864450139 100644 --- a/bot/cogs/error_handler.py +++ b/bot/cogs/error_handler.py @@ -1,20 +1,8 @@ import contextlib import logging +import typing as t -from discord.ext.commands import ( - BadArgument, - BotMissingPermissions, - CheckFailure, - CommandError, - CommandInvokeError, - CommandNotFound, - CommandOnCooldown, - DisabledCommand, - MissingPermissions, - NoPrivateMessage, - UserInputError, -) -from discord.ext.commands import Cog, Context +from discord.ext.commands import Cog, Command, Context, errors from sentry_sdk import push_scope from bot.api import ResponseCodeError @@ -32,118 +20,177 @@ class ErrorHandler(Cog): self.bot = bot @Cog.listener() - async def on_command_error(self, ctx: Context, e: CommandError) -> None: + async def on_command_error(self, ctx: Context, e: errors.CommandError) -> None: """ Provide generic command error handling. - Error handling is deferred to any local error handler, if present. - - Error handling emits a single error response, prioritized as follows: - 1. If the name fails to match a command but matches a tag, the tag is invoked - 2. Send a BadArgument error message to the invoking context & invoke the command's help - 3. Send a UserInputError error message to the invoking context & invoke the command's help - 4. Send a NoPrivateMessage error message to the invoking context - 5. Send a BotMissingPermissions error message to the invoking context - 6. Log a MissingPermissions error, no message is sent - 7. Send a InChannelCheckFailure error message to the invoking context - 8. Log CheckFailure, CommandOnCooldown, and DisabledCommand errors, no message is sent - 9. For CommandInvokeErrors, response is based on the type of error: - * 404: Error message is sent to the invoking context - * 400: Log the resopnse JSON, no message is sent - * 500 <= status <= 600: Error message is sent to the invoking context - 10. Otherwise, handling is deferred to `handle_unexpected_error` + Error handling is deferred to any local error handler, if present. This is done by + checking for the presence of a `handled` attribute on the error. + + Error handling emits a single error message in the invoking context `ctx` and a log message, + prioritised as follows: + + 1. If the name fails to match a command but matches a tag, the tag is invoked + * If CommandNotFound is raised when invoking the tag (determined by the presence of the + `invoked_from_error_handler` attribute), this error is treated as being unexpected + and therefore sends an error message + * Commands in the verification channel are ignored + 2. UserInputError: see `handle_user_input_error` + 3. CheckFailure: see `handle_check_failure` + 4. CommandOnCooldown: send an error message in the invoking context + 5. ResponseCodeError: see `handle_api_error` + 6. Otherwise, if not a DisabledCommand, handling is deferred to `handle_unexpected_error` """ command = ctx.command - parent = None + if hasattr(e, "handled"): + log.trace(f"Command {command} had its error already handled locally; ignoring.") + return + + # Try to look for a tag with the command's name if the command isn't found. + if isinstance(e, errors.CommandNotFound) and not hasattr(ctx, "invoked_from_error_handler"): + if ctx.channel.id != Channels.verification: + await self.try_get_tag(ctx) + return # Exit early to avoid logging. + elif isinstance(e, errors.UserInputError): + await self.handle_user_input_error(ctx, e) + elif isinstance(e, errors.CheckFailure): + await self.handle_check_failure(ctx, e) + elif isinstance(e, errors.CommandOnCooldown): + await ctx.send(e) + elif isinstance(e, errors.CommandInvokeError): + if isinstance(e.original, ResponseCodeError): + await self.handle_api_error(ctx, e.original) + else: + await self.handle_unexpected_error(ctx, e.original) + return # Exit early to avoid logging. + elif not isinstance(e, errors.DisabledCommand): + # ConversionError, MaxConcurrencyReached, ExtensionError + await self.handle_unexpected_error(ctx, e) + return # Exit early to avoid logging. + + log.debug( + f"Command {command} invoked by {ctx.message.author} with error " + f"{e.__class__.__name__}: {e}" + ) + + async def get_help_command(self, command: t.Optional[Command]) -> t.Tuple: + """Return the help command invocation args to display help for `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) + return self.bot.get_command("help"), parent.name, command.name elif command: - help_command = (self.bot.get_command("help"), command.name) + return self.bot.get_command("help"), command.name else: - help_command = (self.bot.get_command("help"),) + return self.bot.get_command("help") - if hasattr(e, "handled"): - log.trace(f"Command {command} had its error already handled locally; ignoring.") + async def try_get_tag(self, ctx: Context) -> None: + """ + Attempt to display a tag by interpreting the command name as a tag name. + + The invocation of tags get respects its checks. Any CommandErrors raised will be handled + by `on_command_error`, but the `invoked_from_error_handler` attribute will be added to + the context to prevent infinite recursion in the case of a CommandNotFound exception. + """ + tags_get_command = self.bot.get_command("tags get") + ctx.invoked_from_error_handler = True + + log_msg = "Cancelling attempt to fall back to a tag due to failed checks." + try: + if not await tags_get_command.can_run(ctx): + log.debug(log_msg) + return + except errors.CommandError as tag_error: + log.debug(log_msg) + await self.on_command_error(ctx, tag_error) 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 - - log_msg = "Cancelling attempt to fall back to a tag due to failed checks." - try: - if not await tags_get_command.can_run(ctx): - log.debug(log_msg) - return - except CommandError as tag_error: - log.debug(log_msg) - await self.on_command_error(ctx, tag_error) - return - - # Return to not raise the exception - with contextlib.suppress(ResponseCodeError): - await ctx.invoke(tags_get_command, tag_name=ctx.invoked_with) - return - elif isinstance(e, BadArgument): + # Return to not raise the exception + with contextlib.suppress(ResponseCodeError): + await ctx.invoke(tags_get_command, tag_name=ctx.invoked_with) + return + + async def handle_user_input_error(self, ctx: Context, e: errors.UserInputError) -> None: + """ + Send an error message in `ctx` for UserInputError, sometimes invoking the help command too. + + * MissingRequiredArgument: send an error message with arg name and the help command + * TooManyArguments: send an error message and the help command + * BadArgument: send an error message and the help command + * BadUnionArgument: send an error message including the error produced by the last converter + * ArgumentParsingError: send an error message + * Other: send an error message and the help command + """ + # TODO: use ctx.send_help() once PR #519 is merged. + help_command = await self.get_help_command(ctx.command) + + if isinstance(e, errors.MissingRequiredArgument): + await ctx.send(f"Missing required argument `{e.param.name}`.") + await ctx.invoke(*help_command) + elif isinstance(e, errors.TooManyArguments): + await ctx.send(f"Too many arguments provided.") + await ctx.invoke(*help_command) + elif isinstance(e, errors.BadArgument): await ctx.send(f"Bad argument: {e}\n") await ctx.invoke(*help_command) - elif isinstance(e, UserInputError): + elif isinstance(e, errors.BadUnionArgument): + await ctx.send(f"Bad argument: {e}\n```{e.errors[-1]}```") + elif isinstance(e, errors.ArgumentParsingError): + await ctx.send(f"Argument parsing error: {e}") + else: 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}" + + @staticmethod + async def handle_check_failure(ctx: Context, e: errors.CheckFailure) -> None: + """ + Send an error message in `ctx` for certain types of CheckFailure. + + The following types are handled: + + * BotMissingPermissions + * BotMissingRole + * BotMissingAnyRole + * NoPrivateMessage + * InChannelCheckFailure + """ + bot_missing_errors = ( + errors.BotMissingPermissions, + errors.BotMissingRole, + errors.BotMissingAnyRole + ) + + if isinstance(e, bot_missing_errors): + await ctx.send( + f"Sorry, it looks like I don't have the permissions or roles I need to do that." ) - elif isinstance(e, InChannelCheckFailure): + elif isinstance(e, (InChannelCheckFailure, errors.NoPrivateMessage)): await ctx.send(e) - 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) + + @staticmethod + async def handle_api_error(ctx: Context, e: ResponseCodeError) -> None: + """Send an error message in `ctx` for ResponseCodeError and log it.""" + if e.status == 404: + await ctx.send("There does not seem to be anything matching your query.") + log.debug(f"API responded with 404 for command {ctx.command}") + elif e.status == 400: + content = await e.response.json() + log.debug(f"API responded with 400 for command {ctx.command}: %r.", content) + await ctx.send("According to the API, your request is malformed.") + elif 500 <= e.status < 600: + await ctx.send("Sorry, there seems to be an internal issue with the API.") + log.warning(f"API responded with {e.status} for command {ctx.command}") else: - await self.handle_unexpected_error(ctx, e) + await ctx.send(f"Got an unexpected status code from the API (`{e.status}`).") + log.warning(f"Unexpected API response for command {ctx.command}: {e.status}") @staticmethod - async def handle_unexpected_error(ctx: Context, e: CommandError) -> None: - """Generic handler for errors without an explicit handler.""" + async def handle_unexpected_error(ctx: Context, e: errors.CommandError) -> None: + """Send a generic error message in `ctx` and log the exception as an error with exc_info.""" await ctx.send( f"Sorry, an unexpected error occurred. Please let us know!\n\n" f"```{e.__class__.__name__}: {e}```" diff --git a/bot/cogs/moderation/infractions.py b/bot/cogs/moderation/infractions.py index f4e296df9..9ea17b2b3 100644 --- a/bot/cogs/moderation/infractions.py +++ b/bot/cogs/moderation/infractions.py @@ -313,6 +313,6 @@ class Infractions(InfractionScheduler, commands.Cog): async def cog_command_error(self, ctx: Context, error: Exception) -> None: """Send a notification to the invoking context on a Union failure.""" if isinstance(error, commands.BadUnionArgument): - if discord.User in error.converters: + if discord.User in error.converters or discord.Member in error.converters: await ctx.send(str(error.errors[0])) error.handled = True |