107 lines
3.2 KiB
Python
107 lines
3.2 KiB
Python
# pyruse is intended as a replacement to both fail2ban and epylog
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# Copyright © 2017–2018 Y. Gablin
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# Full licensing information in the LICENSE file, or gnu.org/licences/gpl-3.0.txt if the file is missing.
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import datetime
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class _GraceAndTicks():
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def __init__(self):
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self.grace = None
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self.ticks = []
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class _CounterData():
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def __init__(self):
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self._keyVals = {}
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def clean(self, refDT):
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for k in list(self._keyVals.keys()):
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v = self._keyVals[k]
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if v.grace and v.grace <= refDT:
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v.grace = None
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if v.grace is None:
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# None values (∞) are at the end of the list
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for i in range(0, len(v.ticks)):
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if v.ticks[i] and v.ticks[i] <= refDT:
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continue
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v.ticks = v.ticks[i:]
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break
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else:
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del self._keyVals[k]
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def graceActive(self, counterKey, refDT):
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self.clean(refDT)
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return counterKey in self._keyVals and self._keyVals[counterKey].grace
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def augment(self, counterKey, refDT, until):
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self.clean(refDT)
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if counterKey in self._keyVals:
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v = self._keyVals[counterKey]
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if v.grace:
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return 0
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else:
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v = _GraceAndTicks()
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self._keyVals[counterKey] = v
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l = len(v.ticks)
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# chances are that until is greater than the last item
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for i in range(l, 0, -1):
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if until is None or (v.ticks[i - 1] and v.ticks[i - 1] < until):
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v.ticks.insert(i, until)
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break
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else:
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v.ticks.insert(0, until)
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return l + 1
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def lower(self, counterKey, refDT):
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self.clean(refDT)
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v = self._keyVals.get(counterKey, None)
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if v is None or v.grace:
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return 0
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l = len(v.ticks)
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if l == 1:
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del self._keyVals[counterKey]
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return 0
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v.ticks.pop()
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return l - 1
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def reset(self, counterKey, refDT, graceUntil):
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self.clean(refDT)
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if graceUntil:
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v = _GraceAndTicks()
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v.grace = graceUntil
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self._keyVals[counterKey] = v
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elif counterKey in self._keyVals:
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del self._keyVals[counterKey]
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class Counter():
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_counters = {}
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def __init__(self, counter):
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if counter not in Counter._counters:
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Counter._counters[counter] = _CounterData()
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self.counter = Counter._counters[counter]
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def augment(self, counterKey, duration = None):
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now = datetime.datetime.utcnow()
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if self.counter.graceActive(counterKey, now):
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return 0
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else:
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return self.counter.augment(counterKey, now, now + duration if duration else None)
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def lower(self, counterKey):
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now = datetime.datetime.utcnow()
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if self.counter.graceActive(counterKey, now):
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return 0
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else:
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return self.counter.lower(counterKey, now)
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def reset(self, counterKey, graceDuration = None):
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now = datetime.datetime.utcnow()
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self.counter.reset(
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counterKey, now,
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now + graceDuration if graceDuration else None
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)
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