bot.py 文件源码

def on_command_error(self, ctx, error):
        if isinstance(error, commands.CheckFailure) and await self.is_owner(ctx.author):
            # There is actually a race here. When this command is invoked the
            # first time, it's wrapped in a context manager that automatically
            # starts and closes a DB session.
            #
            # The issue is that this event is dispatched, which means during the
            # first invoke, it creates a task for this and goes on with its day.
            # The problem is that it doesn't wait for this event, meaning it might
            # accidentally close the session before or during this command's
            # reinvoke.
            #
            # This solution is dirty but since I'm only doing it once here
            # it's fine. Besides it works anyway.
            while ctx.session:
                await asyncio.sleep(0)

            try:
                async with ctx.acquire():
                    await ctx.reinvoke()
            except Exception as exc:
                await ctx.command.dispatch_error(ctx, exc)
            return

        # command_counter['failed'] += 0 sets the 'failed' key. We don't want that.
        if not isinstance(error, commands.CommandNotFound):
            self.command_counter['failed'] += 1

        cause = error.__cause__
        if isinstance(error, errors.ChiakiException):
            await ctx.send(str(error))
        elif type(error) is commands.BadArgument:
            await ctx.send(str(cause or error))
        elif isinstance(error, commands.NoPrivateMessage):
            await ctx.send('This command cannot be used in private messages.')
        elif isinstance(error, commands.MissingRequiredArgument):
            await ctx.send(f'This command ({ctx.command}) needs another parameter ({error.param})')
        elif isinstance(error, commands.CommandInvokeError):
            print(f'In {ctx.command.qualified_name}:', file=sys.stderr)
            traceback.print_tb(error.original.__traceback__)
            print(f'{error.__class__.__name__}: {error}'.format(error), file=sys.stderr)