引发自定义错误消息

问题描述

所以当他们使用 ?hello 时，下面的代码会阻止列表中的服务器和用户 ID，所以我试图引发自定义错误消息.如果用户 id 在列表中，它会告诉 User Blacklisted，如果服务器 id 在列表中，它会告诉 Server 已被列入黑名单.

So below code blocks server and user id in the list when they use ?hello, so I am trying to raise custom error message. If user id is in list, it will tell User Blacklisted and if server id is in list, it will tell Server has been Blacklisted.

LIST_OF_USER_IDS = ['34534545546', '34534545546']
LIST_OF_SERVER_IDS = ['34534545546', '34534545546']

def blacklists(users, servers):
    def predicate(ctx):
        return ctx.message.author.id not in users and ctx.message.server.id not in servers
    return commands.check(predicate)

@bot.command(pass_context=True)
@blacklists(LIST_OF_USER_IDS, LIST_OF_SERVER_IDS)
async def hello(ctx):
     await bot.say("Hello {}".format(ctx.message.author.mention))

所以我尝试了下面的代码，但出现错误.我只是一个初学者，所以我的代码不正确，所以我需要帮助来解决这个问题.

So I tried below code but getting error. I'm just a beginner so my code is not correct, so I need a help to fix this.

def blacklists(users, servers):
    def predicate(ctx):
        return ctx.message.author.id not in users and ctx.message.server.id not in servers
    return commands.check(predicate)
try:
       if ctx.message.author.id in LIST_OF_USER_IDS:
           raise UserBlacklisted
       elif ctx.message.server.id in LIST_OF_SERVER_IDS:
           raise ServerBlacklisted
       break
   except UserBlacklisted:
       await bot.send_message(ctx.message.channel, "User Blacklisted")
   except ServerBlacklisted:
       await bot.send_message(ctx.message.channel, "Server has been Blacklisted")

推荐答案

如果检查失败，而不是返回 False，而是引发 CommandError 的子类，然后处理on_command_error 事件中的错误.

Instead of returning False if the check fails, instead raise a subclass of CommandError, then handle that error in the on_command_error event.

class UserBlacklisted(commands.CommandError):
    def __init__(self, user, *args, **kwargs):
        self.user = user
        super().__init__(*args, **kwargs)

class ServerBlacklisted(commands.CommandError):
    def __init__(self, server, *args, **kwargs):
        self.server = server
        super().__init__(*args, **kwargs)


def blacklists(users, servers):
    def predicate(ctx):
        if ctx.message.author.id in users:
            raise UserBlacklisted(ctx.message.author)
        elif ctx.message.server.id in servers:
            raise ServerBlacklisted(ctx.message.server)
        else:
            return True
    return commands.check(predicate)

@bot.event
async def on_command_error(error, ctx):
    if isinstance(error, UserBlacklisted):
        await bot.send_message(ctx.message.channel, "User {} has been blacklisted".format(error.user.mention))
    elif isinstance(error, ServerBlacklisted):
        await bot.send_message(ctx.message.channel, "Server {} has been blacklisted".format(error.server.name))



@bot.command(pass_context=True)
@blacklists(LIST_OF_USER_IDS, LIST_OF_SERVER_IDS)
async def hello(ctx):
     await bot.say("Hello {}".format(ctx.message.author.mention))

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