Remove duplicates in the user_ips table and add an index (#4370)

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Amber Brown 2019-01-12 06:21:50 +11:00 committed by GitHub
parent 522dada206
commit a35c66a00b
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4 changed files with 164 additions and 4 deletions

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@ -12,6 +12,9 @@ cache:
#
- $HOME/.cache/pip/wheels
addons:
postgresql: "9.4"
# don't clone the whole repo history, one commit will do
git:
depth: 1

1
changelog.d/4370.misc Normal file
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@ -0,0 +1 @@
Apply a unique index to the user_ips table, preventing duplicates.

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@ -65,7 +65,27 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
columns=["last_seen"],
)
# (user_id, access_token, ip) -> (user_agent, device_id, last_seen)
self.register_background_update_handler(
"user_ips_remove_dupes",
self._remove_user_ip_dupes,
)
# Register a unique index
self.register_background_index_update(
"user_ips_device_unique_index",
index_name="user_ips_user_token_ip_unique_index",
table="user_ips",
columns=["user_id", "access_token", "ip"],
unique=True,
)
# Drop the old non-unique index
self.register_background_update_handler(
"user_ips_drop_nonunique_index",
self._remove_user_ip_nonunique,
)
# (user_id, access_token, ip,) -> (user_agent, device_id, last_seen)
self._batch_row_update = {}
self._client_ip_looper = self._clock.looping_call(
@ -75,6 +95,116 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
"before", "shutdown", self._update_client_ips_batch
)
@defer.inlineCallbacks
def _remove_user_ip_nonunique(self, progress, batch_size):
def f(conn):
txn = conn.cursor()
txn.execute(
"DROP INDEX IF EXISTS user_ips_user_ip"
)
txn.close()
yield self.runWithConnection(f)
yield self._end_background_update("user_ips_drop_nonunique_index")
defer.returnValue(1)
@defer.inlineCallbacks
def _remove_user_ip_dupes(self, progress, batch_size):
last_seen_progress = progress.get("last_seen", 0)
def get_last_seen(txn):
txn.execute(
"""
SELECT last_seen FROM user_ips
WHERE last_seen > ?
ORDER BY last_seen
LIMIT 1
OFFSET ?
""",
(last_seen_progress, batch_size)
)
results = txn.fetchone()
return results
# Get a last seen that's sufficiently far away enough from the last one
last_seen = yield self.runInteraction(
"user_ips_dups_get_last_seen", get_last_seen
)
if not last_seen:
# If we get a None then we're reaching the end and just need to
# delete the last batch.
last = True
# We fake not having an upper bound by using a future date, by
# just multiplying the current time by two....
last_seen = int(self.clock.time_msec()) * 2
else:
last = False
last_seen = last_seen[0]
def remove(txn, last_seen_progress, last_seen):
# This works by looking at all entries in the given time span, and
# then for each (user_id, access_token, ip) tuple in that range
# checking for any duplicates in the rest of the table (via a join).
# It then only returns entries which have duplicates, and the max
# last_seen across all duplicates, which can the be used to delete
# all other duplicates.
# It is efficient due to the existence of (user_id, access_token,
# ip) and (last_seen) indices.
txn.execute(
"""
SELECT user_id, access_token, ip,
MAX(device_id), MAX(user_agent), MAX(last_seen)
FROM (
SELECT user_id, access_token, ip
FROM user_ips
WHERE ? <= last_seen AND last_seen < ?
ORDER BY last_seen
) c
INNER JOIN user_ips USING (user_id, access_token, ip)
GROUP BY user_id, access_token, ip
HAVING count(*) > 1""",
(last_seen_progress, last_seen)
)
res = txn.fetchall()
# We've got some duplicates
for i in res:
user_id, access_token, ip, device_id, user_agent, last_seen = i
# Drop all the duplicates
txn.execute(
"""
DELETE FROM user_ips
WHERE user_id = ? AND access_token = ? AND ip = ?
""",
(user_id, access_token, ip)
)
# Add in one to be the last_seen
txn.execute(
"""
INSERT INTO user_ips
(user_id, access_token, ip, device_id, user_agent, last_seen)
VALUES (?, ?, ?, ?, ?, ?)
""",
(user_id, access_token, ip, device_id, user_agent, last_seen)
)
self._background_update_progress_txn(
txn, "user_ips_remove_dupes", {"last_seen": last_seen}
)
yield self.runInteraction(
"user_ips_dups_remove", remove, last_seen_progress, last_seen
)
if last:
yield self._end_background_update("user_ips_remove_dupes")
defer.returnValue(batch_size)
@defer.inlineCallbacks
def insert_client_ip(self, user_id, access_token, ip, user_agent, device_id,
now=None):
@ -127,10 +257,10 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
"user_id": user_id,
"access_token": access_token,
"ip": ip,
"user_agent": user_agent,
"device_id": device_id,
},
values={
"user_agent": user_agent,
"device_id": device_id,
"last_seen": last_seen,
},
lock=False,
@ -227,7 +357,7 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
results = {}
for key in self._batch_row_update:
uid, access_token, ip = key
uid, access_token, ip, = key
if uid == user_id:
user_agent, _, last_seen = self._batch_row_update[key]
results[(access_token, ip)] = (user_agent, last_seen)

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@ -0,0 +1,26 @@
/* Copyright 2018 New Vector 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.
*/
-- delete duplicates
INSERT INTO background_updates (update_name, progress_json) VALUES
('user_ips_remove_dupes', '{}');
-- add a new unique index to user_ips table
INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
('user_ips_device_unique_index', '{}', 'user_ips_remove_dupes');
-- drop the old original index
INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
('user_ips_drop_nonunique_index', '{}', 'user_ips_device_unique_index');