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126 lines
4.1 KiB
126 lines
4.1 KiB
# -*- coding: utf-8 -*-
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"""
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The MIT License (MIT)
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Copyright (c) 2015-2016 Rapptz
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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"""
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import enum
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import time
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__all__ = ['BucketType', 'Cooldown', 'CooldownMapping']
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class BucketType(enum.Enum):
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default = 0
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user = 1
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server = 2
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channel = 3
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class Cooldown:
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__slots__ = ('rate', 'per', 'type', '_window', '_tokens', '_last')
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def __init__(self, rate, per, type):
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self.rate = int(rate)
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self.per = float(per)
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self.type = type
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self._window = 0.0
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self._tokens = self.rate
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self._last = 0.0
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if not isinstance(self.type, BucketType):
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raise TypeError('Cooldown type must be a BucketType')
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def is_rate_limited(self):
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current = time.time()
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self._last = current
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# first token used means that we start a new rate limit window
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if self._tokens == self.rate:
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self._window = current
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# check if our window has passed and we can refresh our tokens
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if current > self._window + self.per:
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self._tokens = self.rate
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self._window = current
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# check if we're rate limited
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if self._tokens == 0:
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return self.per - (current - self._window)
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# we're not so decrement our tokens
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self._tokens -= 1
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# see if we got rate limited due to this token change, and if
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# so update the window to point to our current time frame
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if self._tokens == 0:
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self._window = current
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def reset(self):
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self._tokens = self.rate
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self._last = 0.0
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def copy(self):
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return Cooldown(self.rate, self.per, self.type)
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def __repr__(self):
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return '<Cooldown rate: {0.rate} per: {0.per} window: {0._window} tokens: {0._tokens}>'.format(self)
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class CooldownMapping:
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def __init__(self, original):
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self._cache = {}
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self._cooldown = original
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@property
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def valid(self):
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return self._cooldown is not None
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def _bucket_key(self, ctx):
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msg = ctx.message
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bucket_type = self._cooldown.type
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if bucket_type is BucketType.user:
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return msg.author.id
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elif bucket_type is BucketType.server:
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return getattr(msg.server, 'id', msg.author.id)
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elif bucket_type is BucketType.channel:
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return msg.channel.id
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def _verify_cache_integrity(self):
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# we want to delete all cache objects that haven't been used
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# in a cooldown window. e.g. if we have a command that has a
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# cooldown of 60s and it has not been used in 60s then that key should be deleted
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current = time.time()
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dead_keys = [k for k, v in self._cache.items() if current > v._last + v.per]
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for k in dead_keys:
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del self._cache[k]
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def get_bucket(self, ctx):
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if self._cooldown.type is BucketType.default:
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return self._cooldown
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self._verify_cache_integrity()
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key = self._bucket_key(ctx)
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if key not in self._cache:
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bucket = self._cooldown.copy()
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self._cache[key] = bucket
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else:
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bucket = self._cache[key]
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return bucket
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