2021-07-26 06:52:13 +02:00
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# SPDX-License-Identifier: AGPL-3.0-only
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import anyio
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2021-09-17 08:34:44 +02:00
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import contextlib
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2021-07-26 08:29:20 +02:00
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from functools import wraps
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2021-09-17 08:34:44 +02:00
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from datetime import datetime, timezone
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def as_corofunc(f):
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@wraps(f)
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async def wrapped(*args, **kwargs):
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# can't decide if i want an `anyio.sleep(0)` here.
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return f(*args, **kwargs)
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return wrapped
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def as_async_cm(cls):
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@wraps(cls, updated=()) # cls.__dict__ doesn't support .update()
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class wrapped(cls, contextlib.AbstractAsyncContextManager):
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__aenter__ = as_corofunc(cls.__enter__)
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__aexit__ = as_corofunc(cls.__exit__)
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return wrapped
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suppress = as_async_cm(contextlib.suppress)
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2021-07-26 06:52:13 +02:00
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def shield(f):
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2021-07-26 08:29:20 +02:00
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@wraps(f)
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2021-07-26 06:52:13 +02:00
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async def shielded(*args, **kwargs):
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2021-07-26 08:29:20 +02:00
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with anyio.CancelScope(shield=True):
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2021-07-26 06:52:13 +02:00
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return await f(*args, **kwargs)
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return shielded
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2021-08-19 12:40:57 +02:00
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def removeprefix(s, prefix):
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try:
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return s.removeprefix(prefix)
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except AttributeError:
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# compatibility for pre-3.9
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return s[len(prefix):] if s.startswith(prefix) else s
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2021-09-17 08:35:54 +02:00
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async def sleep_until(dt):
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await anyio.sleep((dt - datetime.now(timezone.utc)).total_seconds())
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class HandleRateLimits:
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def __init__(self, http):
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self.http = http
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def request(self, *args, **kwargs):
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return _RateLimitContextManager(self.http, args, kwargs)
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class _RateLimitContextManager(contextlib.AbstractAsyncContextManager):
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def __init__(self, http, args, kwargs):
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self.http = http
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self.args = args
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self.kwargs = kwargs
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async def __aenter__(self):
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self._request_cm = self.http.request(*self.args, **self.kwargs)
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return await self._do_enter()
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async def _do_enter(self):
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resp = await self._request_cm.__aenter__()
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if resp.headers.get('X-RateLimit-Remaining') not in {'0', '1'}:
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return resp
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await sleep_until(datetime.fromisoformat(resp.headers['X-RateLimit-Reset']))
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await self._request_cm.__aexit__(*(None,)*3)
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return await self.__aenter__()
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async def __aexit__(self, *excinfo):
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return await self._request_cm.__aexit__(*excinfo)
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