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109 lines
3.1 KiB
109 lines
3.1 KiB
"""
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Connection limitation.
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Number of connections from one IP is limited.
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We have nothing against scripting and automated queries.
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Even the opposite, we encourage them. But there are some
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connection limits that even we can't handle.
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Currently the limits are quite restrictive, but they will be relaxed
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in the future.
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Usage:
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limits = Limits()
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not_allowed = limits.check_ip(ip_address)
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if not_allowed:
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return "ERROR: %s" % not_allowed
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[Taken from github.com/chubin/cheat.sh]
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"""
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import time
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from globals import log
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def _time_caps(minutes, hours, days):
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return {
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'min': minutes,
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'hour': hours,
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'day': days,
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}
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class Limits(object):
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"""
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Queries limitation (by IP).
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Exports:
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check_ip(ip_address)
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"""
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def __init__(self, whitelist=None, limits=None):
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self.intervals = ['min', 'hour', 'day']
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self.divisor = _time_caps(60, 3600, 86400)
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self.last_update = _time_caps(0, 0, 0)
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if limits:
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self.limit = _time_caps(*limits)
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else:
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self.limit = _time_caps(30, 600, 1000)
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if whitelist:
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self.whitelist = whitelist[:]
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else:
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self.whitelist = []
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self.counter = {
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'min': {},
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'hour': {},
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'day': {},
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}
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self._clear_counters_if_needed()
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def _log_visit(self, interval, ip_address):
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if ip_address not in self.counter[interval]:
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self.counter[interval][ip_address] = 0
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self.counter[interval][ip_address] += 1
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def _limit_exceeded(self, interval, ip_address):
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visits = self.counter[interval][ip_address]
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limit = self._get_limit(interval)
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return visits > limit
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def _get_limit(self, interval):
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return self.limit[interval]
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def _report_excessive_visits(self, interval, ip_address):
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log("%s LIMITED [%s for %s]" % (ip_address, self._get_limit(interval), interval))
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def check_ip(self, ip_address):
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"""
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Check if `ip_address` is allowed, and if not raise an RuntimeError exception.
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Return True otherwise
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"""
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if ip_address in self.whitelist:
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return None
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self._clear_counters_if_needed()
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for interval in self.intervals:
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self._log_visit(interval, ip_address)
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if self._limit_exceeded(interval, ip_address):
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self._report_excessive_visits(interval, ip_address)
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return ("Not so fast! Number of queries per %s is limited to %s"
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% (interval, self._get_limit(interval)))
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return None
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def reset(self):
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"""
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Reset all counters for all IPs
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"""
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for interval in self.intervals:
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self.counter[interval] = {}
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def _clear_counters_if_needed(self):
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current_time = int(time.time())
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for interval in self.intervals:
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if current_time // self.divisor[interval] != self.last_update[interval]:
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self.counter[interval] = {}
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self.last_update[interval] = current_time / self.divisor[interval]
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