fix race condiftion in calling initialise_reserved_users

pull/4081/head
Neil Johnson 2018-10-23 15:24:58 +01:00
parent 7aea00069c
commit 6105c6101f
5 changed files with 55 additions and 27 deletions

2
changelog.d/4081.bugfix Normal file
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@ -0,0 +1,2 @@
Fix race condition in populating reserved users

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@ -553,14 +553,6 @@ def run(hs):
generate_monthly_active_users,
)
# XXX is this really supposed to be a background process? it looks
# like it needs to complete before some of the other stuff runs.
run_as_background_process(
"initialise_reserved_users",
hs.get_datastore().initialise_reserved_users,
hs.config.mau_limits_reserved_threepids,
)
start_generate_monthly_active_users()
if hs.config.limit_usage_by_mau:
clock.looping_call(start_generate_monthly_active_users, 5 * 60 * 1000)

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@ -33,19 +33,28 @@ class MonthlyActiveUsersStore(SQLBaseStore):
self._clock = hs.get_clock()
self.hs = hs
self.reserved_users = ()
self.initialise_reserved_users(
dbconn.cursor(), hs.config.mau_limits_reserved_threepids
)
@defer.inlineCallbacks
def initialise_reserved_users(self, threepids):
store = self.hs.get_datastore()
def initialise_reserved_users(self, txn, threepids):
"""
Ensures that reserved threepids are accounted for in the MAU table, should
be called on start up.
Arguments:
threepids []: List of threepid dicts to reserve
"""
reserved_user_list = []
# Do not add more reserved users than the total allowable number
for tp in threepids[:self.hs.config.max_mau_value]:
user_id = yield store.get_user_id_by_threepid(
user_id = self.get_user_id_by_threepid_txn(
txn,
tp["medium"], tp["address"]
)
if user_id:
yield self.upsert_monthly_active_user(user_id)
self.upsert_monthly_active_user_txn(txn, user_id)
reserved_user_list.append(user_id)
else:
logger.warning(
@ -55,8 +64,7 @@ class MonthlyActiveUsersStore(SQLBaseStore):
@defer.inlineCallbacks
def reap_monthly_active_users(self):
"""
Cleans out monthly active user table to ensure that no stale
"""Cleans out monthly active user table to ensure that no stale
entries exist.
Returns:
@ -165,19 +173,33 @@ class MonthlyActiveUsersStore(SQLBaseStore):
@defer.inlineCallbacks
def upsert_monthly_active_user(self, user_id):
"""Updates or inserts monthly active user member
Arguments:
user_id (str): user to add/update
"""
is_insert = yield self.runInteraction(
"upsert_monthly_active_user", self.upsert_monthly_active_user_txn,
user_id
)
if is_insert:
self.user_last_seen_monthly_active.invalidate((user_id,))
self.get_monthly_active_count.invalidate(())
def upsert_monthly_active_user_txn(self, txn, user_id):
"""
Updates or inserts monthly active user member
Arguments:
txn (cursor):
user_id (str): user to add/update
Deferred[bool]: True if a new entry was created, False if an
bool: True if a new entry was created, False if an
existing one was updated.
"""
# Am consciously deciding to lock the table on the basis that is ought
# never be a big table and alternative approaches (batching multiple
# upserts into a single txn) introduced a lot of extra complexity.
# See https://github.com/matrix-org/synapse/issues/3854 for more
is_insert = yield self._simple_upsert(
desc="upsert_monthly_active_user",
is_insert = self._simple_upsert_txn(
txn,
table="monthly_active_users",
keyvalues={
"user_id": user_id,
@ -186,9 +208,7 @@ class MonthlyActiveUsersStore(SQLBaseStore):
"timestamp": int(self._clock.time_msec()),
},
)
if is_insert:
self.user_last_seen_monthly_active.invalidate((user_id,))
self.get_monthly_active_count.invalidate(())
return is_insert
@cached(num_args=1)
def user_last_seen_monthly_active(self, user_id):

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@ -474,17 +474,25 @@ class RegistrationStore(RegistrationWorkerStore,
@defer.inlineCallbacks
def get_user_id_by_threepid(self, medium, address):
ret = yield self._simple_select_one(
user_id = yield self.runInteraction(
"get_user_id_by_threepid", self.get_user_id_by_threepid_txn,
medium, address
)
defer.returnValue(user_id)
def get_user_id_by_threepid_txn(self, txn, medium, address):
ret = self._simple_select_one_txn(
txn,
"user_threepids",
{
"medium": medium,
"address": address
},
['user_id'], True, 'get_user_id_by_threepid'
['user_id'], True
)
if ret:
defer.returnValue(ret['user_id'])
defer.returnValue(None)
return ret['user_id']
return None
def user_delete_threepid(self, user_id, medium, address):
return self._simple_delete(

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@ -52,7 +52,10 @@ class MonthlyActiveUsersTestCase(HomeserverTestCase):
now = int(self.hs.get_clock().time_msec())
self.store.user_add_threepid(user1, "email", user1_email, now, now)
self.store.user_add_threepid(user2, "email", user2_email, now, now)
self.store.initialise_reserved_users(threepids)
self.store.runInteraction(
"initialise", self.store.initialise_reserved_users, threepids
)
self.pump()
active_count = self.store.get_monthly_active_count()
@ -199,7 +202,10 @@ class MonthlyActiveUsersTestCase(HomeserverTestCase):
{'medium': 'email', 'address': user2_email},
]
self.hs.config.mau_limits_reserved_threepids = threepids
self.store.initialise_reserved_users(threepids)
self.store.runInteraction(
"initialise", self.store.initialise_reserved_users, threepids
)
self.pump()
count = self.store.get_registered_reserved_users_count()
self.assertEquals(self.get_success(count), 0)