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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.
import logging
from twisted.internet import defer
from ._base import Cache
from . import background_updates
logger = logging.getLogger(__name__)
# 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(background_updates.BackgroundUpdateStore):
def __init__(self, hs):
self.client_ip_last_seen = Cache(
name="client_ip_last_seen",
keylen=4,
)
super(ClientIpStore, self).__init__(hs)
self.register_background_index_update(
"user_ips_device_index",
index_name="user_ips_device_id",
table="user_ips",
columns=["user_id", "device_id", "last_seen"],
)
@defer.inlineCallbacks
def insert_client_ip(self, user, access_token, ip, user_agent, device_id):
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,
"device_id": device_id,
},
values={
"last_seen": now,
},
desc="insert_client_ip",
lock=False,
)
@defer.inlineCallbacks
def get_last_client_ip_by_device(self, devices):
"""For each device_id listed, give the user_ip it was last seen on
Args:
devices (iterable[(str, str)]): list of (user_id, device_id) pairs
Returns:
defer.Deferred: resolves to a dict, where the keys
are (user_id, device_id) tuples. The values are also dicts, with
keys giving the column names
"""
if not devices:
defer.returnValue({})
res = yield self.runInteraction(
"get_last_client_ip_by_device",
self._get_last_client_ip_by_device_txn,
retcols=(
"user_id",
"access_token",
"ip",
"user_agent",
"device_id",
"last_seen",
),
devices=devices
)
ret = {(d["user_id"], d["device_id"]): d for d in res}
defer.returnValue(ret)
@classmethod
def _get_last_client_ip_by_device_txn(cls, txn, devices, retcols):
if not devices:
return []
where_clauses = []
bindings = []
for (user_id, device_id) in devices:
if device_id is None:
where_clauses.append("(user_id = ? AND device_id IS NULL)")
bindings.extend((user_id, ))
else:
where_clauses.append("(user_id = ? AND device_id = ?)")
bindings.extend((user_id, device_id))
inner_select = (
"SELECT MAX(last_seen) mls, user_id, device_id FROM user_ips "
"WHERE %(where)s "
"GROUP BY user_id, device_id"
) % {
"where": " OR ".join(where_clauses),
}
sql = (
"SELECT %(retcols)s FROM user_ips "
"JOIN (%(inner_select)s) ips ON"
" user_ips.last_seen = ips.mls AND"
" user_ips.user_id = ips.user_id AND"
" (user_ips.device_id = ips.device_id OR"
" (user_ips.device_id IS NULL AND ips.device_id IS NULL)"
" )"
) % {
"retcols": ",".join("user_ips." + c for c in retcols),
"inner_select": inner_select,
}
txn.execute(sql, bindings)
return cls.cursor_to_dict(txn)
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