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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from ._base import SQLBaseStore, Cache
from twisted.internet import defer
# Number of msec of granularity to store the user IP 'last seen' time. Smaller
# times give more inserts into the database even for readonly API hits
# 120 seconds == 2 minutes
LAST_SEEN_GRANULARITY = 120 * 1000
class ClientIpStore(SQLBaseStore):
def __init__(self, hs):
self.client_ip_last_seen = Cache(
name="client_ip_last_seen",
keylen=4,
)
super(ClientIpStore, self).__init__(hs)
@defer.inlineCallbacks
def insert_client_ip(self, user, access_token, ip, user_agent):
now = int(self._clock.time_msec())
key = (user.to_string(), access_token, ip)
try:
last_seen = self.client_ip_last_seen.get(key)
except KeyError:
last_seen = None
# Rate-limited inserts
if last_seen is not None and (now - last_seen) < LAST_SEEN_GRANULARITY:
defer.returnValue(None)
self.client_ip_last_seen.prefill(key, now)
# It's safe not to lock here: a) no unique constraint,
# b) LAST_SEEN_GRANULARITY makes concurrent updates incredibly unlikely
yield self._simple_upsert(
"user_ips",
keyvalues={
"user_id": user.to_string(),
"access_token": access_token,
"ip": ip,
"user_agent": user_agent,
},
values={
"last_seen": now,
},
desc="insert_client_ip",
lock=False,
)
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