4 # S.Çağlar Onur <caglar@cs.princeton.edu>
6 from PLC.Config import Config
7 from PLC.Faults import PLCPermissionDenied
9 from datetime import datetime, timedelta
11 from pyaspects.meta import MetaAspect
15 class BaseRateLimit(object):
18 self.config = Config("/etc/planetlab/plc_config")
20 # FIXME: change with Config values
21 self.prefix = "ratelimit"
22 self.minutes = 5 # The time period
23 self.requests = 50 # Number of allowed requests in that time period
24 self.expire_after = (self.minutes + 1) * 60
29 log = open("/var/log/plc_ratelimit.log", "a")
30 date = datetime.now().strftime("%d/%m/%y %H:%M")
31 log.write("%s - %s\n" % (date, line))
34 def before(self, wobj, data, *args, **kwargs):
35 # ratelimit_128.112.139.115_201011091532 = 1
36 # ratelimit_128.112.139.115_201011091533 = 14
37 # ratelimit_128.112.139.115_201011091534 = 11
38 # Now, on every request we work out the keys for the past five minutes and use get_multi to retrieve them.
39 # If the sum of those counters exceeds the maximum allowed for that time period, we block the request.
41 api_method_name = wobj.name
42 api_method_source = wobj.source
43 api_method_caller = args[0]["Username"]
45 if api_method_source == None or api_method_source[0] == self.config.PLC_API_IP or api_method_source[0] in self.whitelist:
48 if api_method_caller == None:
49 self.log("%s called with Username = None" % api_method_source[0])
52 mc = memcache.Client(["%s:11211" % self.config.PLC_API_HOST])
54 current_key = "%s_%s_%s_%s" % (self.prefix, api_method_caller, api_method_source[0], now.strftime("%Y%m%d%H%M"))
56 keys_to_check = ["%s_%s_%s_%s" % (self.prefix, api_method_caller, api_method_source[0], (now - timedelta(minutes = minute)).strftime("%Y%m%d%H%M")) for minute in range(self.minutes + 1)]
59 value = mc.incr(current_key)
64 mc.set(current_key, 1, time=self.expire_after)
66 result = mc.get_multi(keys_to_check)
69 total_requests += result[i]
71 if total_requests > self.requests:
72 self.log("%s - %s" % (api_method_source[0], api_method_caller))
73 raise PLCPermissionDenied, "Maximum allowed number of API calls exceeded"
75 def after(self, wobj, data, *args, **kwargs):
78 class RateLimitAspect_class(BaseRateLimit):
79 __metaclass__ = MetaAspect
80 name = "ratelimitaspect_class"
83 BaseRateLimit.__init__(self)
85 def before(self, wobj, data, *args, **kwargs):
86 BaseRateLimit.before(self, wobj, data, *args, **kwargs)
88 def after(self, wobj, data, *args, **kwargs):
89 BaseRateLimit.after(self, wobj, data, *args, **kwargs)
91 RateLimitAspect = RateLimitAspect_class