python - 如何保存命令冷却时间？

Question

下面的代码为命令添加了冷却时间，但是当机器人重新启动时，冷却时间会重置。那么我怎样才能让机器人记住以前的使用情况呢？如果冷却时间限制是每天 5 次，并且如果成员使用了 3 次，并且如果机器人重新启动，它应该从它为所有成员留下的地方开始。

import discord
from discord.ext import commands
import random

from utils import Bot
from utils import CommandWithCooldown

class Members():
    def __init__(self, bot):
        self.bot = bot


    @commands.command(pass_context=True, cls=CommandWithCooldown)
    @commands.cooldown(1, 600, commands.BucketType.user)
    async def ping(self, ctx):
        msg = "Pong {0.author.mention}".format(ctx.message)
        await self.bot.say(msg)


def setup(bot):
    bot.add_cog(Members(bot))

Answer 1

与 Patrick Haugh 的建议类似，冷却时间映射存储在 Command._buckets 中。您可以在机器人启动前对桶进行 pickle，并在机器人完成后保存它。为了您的方便，将 Bot 类替换为以下内容(又名“moneypatching”):

token = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
prefix = "?"
cooldown_info_path = "cd.pkl"

from discord.ext import commands


class Bot(commands.Bot):

    async def start(self, *args, **kwargs):
        import os, pickle
        if os.path.exists(cooldown_info_path):  # on the initial run where "cd.pkl" file hadn't been created yet
            with open(cooldown_info_path, 'rb') as f:
                d = pickle.load(f)
                for name, func in self.commands.items():
                    if name in d:  # if the Command name has a CooldownMapping stored in file, override _bucket
                        self.commands[name]._buckets = d[name]
        return await super().start(*args, **kwargs)

    async def logout(self):
        import pickle
        with open(cooldown_info_path, 'wb') as f:
            # dumps a dict of command name to CooldownMapping mapping
            pickle.dump({name: func._buckets for name, func in self.commands.items()}, f)
        return await super().logout()


bot = Bot(prefix)
# everything else as usual

@bot.event
async def on_ready():
    print('Logged in as')
    print(bot.user.name)
    print(bot.user.id)
    print('------')


@bot.command(pass_context=True)
@commands.cooldown(1, 3600, commands.BucketType.user)
async def hello(ctx):
    msg = "Hello... {0.author.mention}".format(ctx.message)
    await bot.say(msg)


class ACog:
    def __init__(self, bot):
        self.bot = bot

    @commands.command(pass_context=True)
    @commands.cooldown(1, 600, commands.BucketType.user)
    async def ping(self, ctx):
        msg = "Pong {0.author.mention}".format(ctx.message)
        await self.bot.say(msg)


bot.add_cog(ACog(bot))
bot.run(token)

---

当机器人正确注销时，这会将冷却时间数据保存到“cd.pkl”。