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76 lines
2.9 KiB
Python
76 lines
2.9 KiB
Python
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import logging
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import time
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from typing import Any, Callable, Optional
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from django.conf import settings
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from django.core.management.base import BaseCommand, CommandParser
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from zerver.lib.rate_limiter import RateLimitedUser, \
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client, max_api_calls, max_api_window
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from zerver.models import get_user_profile_by_id
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class Command(BaseCommand):
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help = """Checks redis to make sure our rate limiting system hasn't grown a bug
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and left redis with a bunch of data
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Usage: ./manage.py [--trim] check_redis"""
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def add_arguments(self, parser: CommandParser) -> None:
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parser.add_argument('-t', '--trim',
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dest='trim',
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default=False,
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action='store_true',
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help="Actually trim excess")
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def _check_within_range(self, key: str, count_func: Callable[[], int],
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trim_func: Optional[Callable[[str, int], None]]=None) -> None:
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user_id = int(key.split(':')[1])
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try:
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user = get_user_profile_by_id(user_id)
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except Exception:
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user = None
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entity = RateLimitedUser(user)
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max_calls = max_api_calls(entity)
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age = int(client.ttl(key))
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if age < 0:
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logging.error("Found key with age of %s, will never expire: %s" % (age, key,))
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count = count_func()
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if count > max_calls:
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logging.error("Redis health check found key with more elements \
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than max_api_calls! (trying to trim) %s %s" % (key, count))
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if trim_func is not None:
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client.expire(key, max_api_window(entity))
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trim_func(key, max_calls)
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def handle(self, *args: Any, **options: Any) -> None:
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if not settings.RATE_LIMITING:
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print("This machine is not using redis or rate limiting, aborting")
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exit(1)
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# Find all keys, and make sure they're all within size constraints
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wildcard_list = "ratelimit:*:*:list"
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wildcard_zset = "ratelimit:*:*:zset"
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trim_func = lambda key, max_calls: client.ltrim(key, 0, max_calls - 1) # type: Optional[Callable[[str, int], None]]
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if not options['trim']:
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trim_func = None
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lists = client.keys(wildcard_list)
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for list_name in lists:
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self._check_within_range(list_name,
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lambda: client.llen(list_name),
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trim_func)
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zsets = client.keys(wildcard_zset)
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for zset in zsets:
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now = time.time()
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# We can warn on our zset being too large, but we don't know what
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# elements to trim. We'd have to go through every list item and take
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# the intersection. The best we can do is expire it
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self._check_within_range(zset,
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lambda: client.zcount(zset, 0, now),
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lambda key, max_calls: None)
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