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问默认情况下，discord.py隐藏哪些错误？
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Stack Overflow用户

提问于 2022-07-15 16:34:10

回答 1查看 339关注 0票数 0

我在许多关于堆栈溢出的文章中提到过，如果没有配置日志记录，默认情况下discord.py会“隐藏错误”。在文档中，有人提到：

强烈建议配置日志模块，因为如果不设置，则不会输出错误或警告。重点雷

但是，在discord.py 1.7.3中，我观察到错误被输出到控制台。运行以下代码片段：

import discord

client = discord.Client(intents=discord.Intents.all())


@client.event
async def on_ready():
    raise ValueError

client.run(TOKEN)

正确地引发ValueError -错误不会被吞没。

在discord.py 2.0中，已经设置了日志记录，输出(具有相同的代码片段)就证明了这一点：

[2022-07-15 12:28:40] [INFO    ] discord.client: logging in using static token
[2022-07-15 12:28:41] [INFO    ] discord.gateway: Shard ID None has sent the IDENTIFY payload.
[2022-07-15 12:28:41] [INFO    ] discord.gateway: Shard ID None has connected to Gateway (Session ID: ...).
[2022-07-15 12:28:43] [ERROR   ] discord.client: Ignoring exception in on_ready
# ^-----------------^ These lines are all from the logging module
Traceback (most recent call last):
  File "C:\Users\TheFu\PycharmProjects\mcve2.0\venv\lib\site-packages\discord\client.py", line 456, in _run_event
    await coro(*args, **kwargs)
  File "C:\Users\TheFu\PycharmProjects\mcve2.0\main.py", line 8, in on_ready
    raise ValueError
ValueError

那么，如果没有在discord.py 1.7.3中设置日志记录，那么为什么输出一个错误呢？在这个版本中会被哪些错误吞没？

python

logging

discord.py

回答 1

Stack Overflow用户

回答已采纳

发布于 2022-07-17 19:22:11

默认情况下，在1.7.3中，它完全绕过日志记录并直接打印到stderr (代码在这里)：

async def on_error(self, event_method, *args, **kwargs):
    print('Ignoring exception in {}'.format(event_method), file=sys.stderr)
    traceback.print_exc()

然后调用on_error，类似于下面的这里

    async def _run_event(self, coro, event_name, *args, **kwargs):
        try:
            await coro(*args, **kwargs)
        except asyncio.CancelledError:
            pass
        except Exception:
            try:
                await self.on_error(event_name, *args, **kwargs)
            except asyncio.CancelledError:
                pass

不管是否设置了日志记录，它都会这样做。

我用这个简化版本的机器人来测试它。注意，它在错误消息中包含了_run_event，这应该是上面代码中链接的相同的错误消息。

import discord
from discord.ext import commands
import logging
import sys

LOGGING_ENABLE = True
if LOGGING_ENABLE:
    log = logging.getLogger()
    log.setLevel(logging.INFO)
    handler = logging.StreamHandler(sys.stdout)
    handler.setLevel(logging.INFO)
    handler.setFormatter(logging.Formatter('\033[0;36m%(asctime)s \033[0;32m%(levelname)s\033[0;0m %(message)s', '%Y%m%d %H:%M:%S'))
    log.addHandler(handler)

print(f'discord version {discord.__version__}')
intent = discord.Intents.all()
client = commands.Bot(command_prefix='sudo ', intents=intent)

@client.event
async def on_ready():
    print('logged in')
    print('raising exception!')
    raise ValueError()

print('starting client.run:')
client.run(...)

当日志记录是而不是设置时给出的

discord version 1.7.3
starting client.run:
logged in
raising exception!
Ignoring exception in on_ready
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "/home/greateric/Documents/PYTHON/old-discordbot/bot_cut.py", line 14, in on_ready
    raise ValueError()
ValueError

并给出了日志记录设置的时间。

discord version 1.7.3
starting client.run:
20220717 14:50:10 INFO logging in using static token
20220717 14:50:11 INFO Shard ID None has sent the IDENTIFY payload.
20220717 14:50:12 INFO Shard ID None has connected to Gateway: <a bunch of irrelevant stuff>.
logged in
raising exception!
Ignoring exception in on_ready
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "/home/greateric/Documents/PYTHON/old-discordbot/bot_cut.py", line 23, in on_ready
    raise ValueError()
ValueError
^C20220717 14:50:15 INFO Cleaning up tasks.
20220717 14:50:15 INFO Cleaning up after 1 tasks.
20220717 14:50:15 INFO All tasks finished cancelling.
20220717 14:50:15 INFO Closing the event loop.

在2.0中，在启用日志记录的情况下，它实际上“很好”地打印了错误。

discord version 2.0.0a
20220717 14:53:09 WARNING PyNaCl is not installed, voice will NOT be supported
starting client.run:
2022-07-17 14:53:09 INFO     discord.client logging in using static token
20220717 14:53:09 INFO logging in using static token
2022-07-17 14:53:09 INFO     discord.gateway Shard ID None has sent the IDENTIFY payload.
20220717 14:53:09 INFO Shard ID None has sent the IDENTIFY payload.
2022-07-17 14:53:09 INFO     discord.gateway Shard ID None has connected to Gateway (Session ID: ...).
20220717 14:53:09 INFO Shard ID None has connected to Gateway (Session ID: ...).
logged in
raising exception!
2022-07-17 14:53:12 ERROR    discord.client Ignoring exception in on_ready
Traceback (most recent call last):
  File "/home/greateric/Documents/PYTHON/old-discordbot/venv/lib/python3.9/site-packages/discord/client.py", line 456, in _run_event
    await coro(*args, **kwargs)
  File "/home/greateric/Documents/PYTHON/old-discordbot/bot_cut.py", line 23, in on_ready
    raise ValueError()
ValueError
20220717 14:53:12 ERROR Ignoring exception in on_ready
Traceback (most recent call last):
  File "/home/greateric/Documents/PYTHON/old-discordbot/venv/lib/python3.9/site-packages/discord/client.py", line 456, in _run_event
    await coro(*args, **kwargs)
  File "/home/greateric/Documents/PYTHON/old-discordbot/bot_cut.py", line 23, in on_ready
    raise ValueError()
ValueError

(我不知道这里发生了什么，但我认为是两个伐木处理人员为了争夺对方而争吵。屏幕截图与颜色这里)

实际上，当我禁用日志记录时，会发生这样的情况：

discord version 2.0.0a
starting client.run:
2022-07-17 14:56:40 INFO     discord.client logging in using static token
2022-07-17 14:56:40 INFO     discord.gateway Shard ID None has sent the IDENTIFY payload.
2022-07-17 14:56:40 INFO     discord.gateway Shard ID None has connected to Gateway (Session ID: 85657d0594417664850b2c03c2ca0d77).
logged in
raising exception!
2022-07-17 14:56:42 ERROR    discord.client Ignoring exception in on_ready
Traceback (most recent call last):
  File "/home/greateric/Documents/PYTHON/old-discordbot/venv/lib/python3.9/site-packages/discord/client.py", line 456, in _run_event
    await coro(*args, **kwargs)
  File "/home/greateric/Documents/PYTHON/old-discordbot/bot_cut.py", line 23, in on_ready
    raise ValueError()
ValueError

现在看来，discord.py正在制作自己的日志处理程序(独立于我上次创建的日志处理程序)。

代码是不同的。(代码段，来自提交52f3a3496bea13fefc08b38f9ed01641e565d0eb)

async def on_error(self, event_method: str, /, *args: Any, **kwargs: Any) -> None:
        """|coro|
        The default error handler provided by the client.
        By default this logs to the library logger however it could be
        overridden to have a different implementation.
        Check :func:`~discord.on_error` for more details.
        .. versionchanged:: 2.0
            ``event_method`` parameter is now positional-only
            and instead of writing to ``sys.stderr`` it logs instead.
        """
        _log.exception('Ignoring exception in %s', event_method)

由于这，记录器独立于您自己的设置记录器。

_log = logging.getLogger(__name__)

它还在__init__.py中添加了一个处理程序。

logging.getLogger(__name__).addHandler(logging.NullHandler())

以这两个文件为例：

a.py

import logging
import sys

handler = logging.StreamHandler(sys.stdout)
handler.setLevel(logging.INFO)
handler.setFormatter(logging.Formatter('\033[0;36m%(asctime)s \033[0;32m%(levelname)s\033[0;0m %(message)s', '%Y%m%d %H:%M:%S'))
logging.getLogger(__name__).addHandler(handler)
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

logger.info('hi from a.py')
print('done executing a.py')

b.py

import logging
import a
import sys

LOGGING_ENABLE = True
if LOGGING_ENABLE:
    logger = logging.getLogger()
    handler = logging.StreamHandler(sys.stdout)
    handler.setLevel(logging.INFO)
    handler.setFormatter(logging.Formatter('\033[0;33mreminder that this is the formatter of b.py \033[0;36m%(asctime)s \033[0;32m%(levelname)s\033[0;0m %(message)s', '%Y%m%d %H:%M:%S'))
    logger = logging.getLogger()
    logger.addHandler(handler)
    logger.setLevel(logging.INFO)
    logger.info('hi from b.py')

print('just finished running b.py')

如果启用了LOGGING_ENABLE，这就是输出。这两个记录器完全相互独立(它们有不同的格式化程序)。

20220717 15:10:49 INFO hi from a.py
done executing a.py
reminder that this is the formatter of b.py 20220717 15:10:49 INFO hi from b.py
just finished running b.py

当b.py中没有记录器时，a.py的记录器仍然工作：

20220717 15:11:19 INFO hi from a.py
done executing a.py
just finished running b.py

or的2.0记录器独立于代码的记录器或缺少一个记录器。不管您自己的记录器设置是什么，它自己的记录器总是会打印错误。

在任何版本中都不应该错误(除了非Exception错误，如KeyboardInterrupt之类的错误)。在2.0中，_run_event基本上是相同的：

    async def _run_event(
        self,
        coro: Callable[..., Coroutine[Any, Any, Any]],
        event_name: str,
        *args: Any,
        **kwargs: Any,
    ) -> None:
        try:
            await coro(*args, **kwargs)
        except asyncio.CancelledError:
            pass
        except Exception:
            try:
                await self.on_error(event_name, *args, **kwargs)
            except asyncio.CancelledError:
                pass

如果有“没有错误”，这通常意味着它被故意忽略，例如，如果您覆盖错误处理程序。也可能是因为某些原因，您的终端忽略了stderr，这在我的另一个项目中发生过一次。

在1.7.3中，无论任何日志记录配置，这些错误都将被打印到stderr，而在2.0中，这些错误将使用不和谐的记录器记录。

当它说什么都不会输出到文档上时，它意味着额外的日志信息，比如logging in using static token信息。错误跟踪仍然直接打印到stderr。

票数 4

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/72997136

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