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Merge pull request #6629 from matrix-org/rav/kill_event_reference_hashes

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Remove a bunch of unused code from event creation
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Richard van der Hoff 2020-01-06 17:46:31 +00:00 committed by GitHub
commit 1807db5e73
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7 changed files with 57 additions and 105 deletions
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1
changelog.d/6629.misc Normal file
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@ -0,0 +1 @@
Simplify event creation code by removing redundant queries on the event_reference_hashes table.

43
synapse/handlers/message.py
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@ -48,7 +48,7 @@ from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.replication.http.send_event import ReplicationSendEventRestServlet
from synapse.storage.data_stores.main.events_worker import EventRedactBehaviour
from synapse.storage.state import StateFilter
from synapse.types import RoomAlias, UserID, create_requester
from synapse.types import Collection, RoomAlias, UserID, create_requester
from synapse.util.async_helpers import Linearizer
from synapse.util.frozenutils import frozendict_json_encoder
from synapse.util.metrics import measure_func
@ -422,7 +422,7 @@ class EventCreationHandler(object):
event_dict,
token_id=None,
txn_id=None,
prev_events_and_hashes=None,
prev_event_ids: Optional[Collection[str]] = None,
require_consent=True,
):
"""
@ -439,10 +439,9 @@ class EventCreationHandler(object):
token_id (str)
txn_id (str)
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
prev_event_ids:
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
new event.
If None, they will be requested from the database.
@ -498,9 +497,7 @@ class EventCreationHandler(object):
builder.internal_metadata.txn_id = txn_id
event, context = yield self.create_new_client_event(
builder=builder,
requester=requester,
prev_events_and_hashes=prev_events_and_hashes,
builder=builder, requester=requester, prev_event_ids=prev_event_ids,
)
# In an ideal world we wouldn't need the second part of this condition. However,
@ -714,7 +711,7 @@ class EventCreationHandler(object):
@measure_func("create_new_client_event")
@defer.inlineCallbacks
def create_new_client_event(
self, builder, requester=None, prev_events_and_hashes=None
self, builder, requester=None, prev_event_ids: Optional[Collection[str]] = None
):
"""Create a new event for a local client
@ -723,10 +720,9 @@ class EventCreationHandler(object):
requester (synapse.types.Requester|None):
prev_events_and_hashes (list[(str, dict[str, str], int)]|None):
prev_event_ids:
the forward extremities to use as the prev_events for the
new event. For each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
new event.
If None, they will be requested from the database.
@ -734,22 +730,15 @@ class EventCreationHandler(object):
Deferred[(synapse.events.EventBase, synapse.events.snapshot.EventContext)]
"""
if prev_events_and_hashes is not None:
assert len(prev_events_and_hashes) <= 10, (
if prev_event_ids is not None:
assert len(prev_event_ids) <= 10, (
"Attempting to create an event with %i prev_events"
% (len(prev_events_and_hashes),)
% (len(prev_event_ids),)
)
else:
prev_events_and_hashes = yield self.store.get_prev_events_for_room(
builder.room_id
)
prev_event_ids = yield self.store.get_prev_events_for_room(builder.room_id)
prev_events = [
(event_id, prev_hashes)
for event_id, prev_hashes, _ in prev_events_and_hashes
]
event = yield builder.build(prev_event_ids=[p for p, _ in prev_events])
event = yield builder.build(prev_event_ids=prev_event_ids)
context = yield self.state.compute_event_context(event)
if requester:
context.app_service = requester.app_service
@ -1042,9 +1031,7 @@ class EventCreationHandler(object):
# For each room we need to find a joined member we can use to send
# the dummy event with.
prev_events_and_hashes = yield self.store.get_prev_events_for_room(room_id)
latest_event_ids = (event_id for (event_id, _, _) in prev_events_and_hashes)
latest_event_ids = yield self.store.get_prev_events_for_room(room_id)
members = yield self.state.get_current_users_in_room(
room_id, latest_event_ids=latest_event_ids
@ -1063,7 +1050,7 @@ class EventCreationHandler(object):
"room_id": room_id,
"sender": user_id,
},
prev_events_and_hashes=prev_events_and_hashes,
prev_event_ids=latest_event_ids,
)
event.internal_metadata.proactively_send = False

11
synapse/handlers/room_member.py
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@ -25,7 +25,7 @@ from twisted.internet import defer
from synapse import types
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError, Codes, SynapseError
from synapse.types import RoomID, UserID
from synapse.types import Collection, RoomID, UserID
from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room, user_left_room
@ -149,7 +149,7 @@ class RoomMemberHandler(object):
target,
room_id,
membership,
prev_events_and_hashes,
prev_event_ids: Collection[str],
txn_id=None,
ratelimit=True,
content=None,
@ -177,7 +177,7 @@ class RoomMemberHandler(object):
},
token_id=requester.access_token_id,
txn_id=txn_id,
prev_events_and_hashes=prev_events_and_hashes,
prev_event_ids=prev_event_ids,
require_consent=require_consent,
)
@ -370,8 +370,7 @@ class RoomMemberHandler(object):
if block_invite:
raise SynapseError(403, "Invites have been disabled on this server")
prev_events_and_hashes = yield self.store.get_prev_events_for_room(room_id)
latest_event_ids = (event_id for (event_id, _, _) in prev_events_and_hashes)
latest_event_ids = yield self.store.get_prev_events_for_room(room_id)
current_state_ids = yield self.state_handler.get_current_state_ids(
room_id, latest_event_ids=latest_event_ids
@ -485,7 +484,7 @@ class RoomMemberHandler(object):
membership=effective_membership_state,
txn_id=txn_id,
ratelimit=ratelimit,
prev_events_and_hashes=prev_events_and_hashes,
prev_event_ids=latest_event_ids,
content=content,
require_consent=require_consent,
)

74
synapse/storage/data_stores/main/event_federation.py
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@ -14,13 +14,10 @@
# limitations under the License.
import itertools
import logging
import random
from six.moves import range
from six.moves.queue import Empty, PriorityQueue
from unpaddedbase64 import encode_base64
from twisted.internet import defer
from synapse.api.errors import StoreError
@ -148,8 +145,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
retcol="event_id",
)
@defer.inlineCallbacks
def get_prev_events_for_room(self, room_id):
def get_prev_events_for_room(self, room_id: str):
"""
Gets a subset of the current forward extremities in the given room.
@ -160,41 +156,30 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
room_id (str): room_id
Returns:
Deferred[list[(str, dict[str, str], int)]]
for each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
"""
res = yield self.get_latest_event_ids_and_hashes_in_room(room_id)
if len(res) > 10:
# Sort by reverse depth, so we point to the most recent.
res.sort(key=lambda a: -a[2])
Deferred[List[str]]: the event ids of the forward extremites
# we use half of the limit for the actual most recent events, and
# the other half to randomly point to some of the older events, to
# make sure that we don't completely ignore the older events.
res = res[0:5] + random.sample(res[5:], 5)
return res
def get_latest_event_ids_and_hashes_in_room(self, room_id):
"""
Gets the current forward extremities in the given room
Args:
room_id (str): room_id
Returns:
Deferred[list[(str, dict[str, str], int)]]
for each event, a tuple of (event_id, hashes, depth)
where *hashes* is a map from algorithm to hash.
"""
return self.db.runInteraction(
"get_latest_event_ids_and_hashes_in_room",
self._get_latest_event_ids_and_hashes_in_room,
room_id,
"get_prev_events_for_room", self._get_prev_events_for_room_txn, room_id
)
def _get_prev_events_for_room_txn(self, txn, room_id: str):
# we just use the 10 newest events. Older events will become
# prev_events of future events.
sql = """
SELECT e.event_id FROM event_forward_extremities AS f
INNER JOIN events AS e USING (event_id)
WHERE f.room_id = ?
ORDER BY e.depth DESC
LIMIT 10
"""
txn.execute(sql, (room_id,))
return [row[0] for row in txn]
def get_rooms_with_many_extremities(self, min_count, limit, room_id_filter):
"""Get the top rooms with at least N extremities.
@ -243,27 +228,6 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
desc="get_latest_event_ids_in_room",
)
def _get_latest_event_ids_and_hashes_in_room(self, txn, room_id):
sql = (
"SELECT e.event_id, e.depth FROM events as e "
"INNER JOIN event_forward_extremities as f "
"ON e.event_id = f.event_id "
"AND e.room_id = f.room_id "
"WHERE f.room_id = ?"
)
txn.execute(sql, (room_id,))
results = []
for event_id, depth in txn.fetchall():
hashes = self._get_event_reference_hashes_txn(txn, event_id)
prev_hashes = {
k: encode_base64(v) for k, v in hashes.items() if k == "sha256"
}
results.append((event_id, prev_hashes, depth))
return results
def get_min_depth(self, room_id):
""" For hte given room, get the minimum depth we have seen for it.
"""

12
synapse/types.py
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@ -15,6 +15,7 @@
# limitations under the License.
import re
import string
import sys
from collections import namedtuple
import attr
@ -23,6 +24,17 @@ from unpaddedbase64 import decode_base64
from synapse.api.errors import SynapseError
# define a version of typing.Collection that works on python 3.5
if sys.version_info[:3] >= (3, 6, 0):
from typing import Collection
else:
from typing import Sized, Iterable, Container, TypeVar
T_co = TypeVar("T_co", covariant=True)
class Collection(Iterable[T_co], Container[T_co], Sized):
__slots__ = ()
class Requester(
namedtuple(

15
tests/storage/test_event_federation.py
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@ -60,21 +60,14 @@ class EventFederationWorkerStoreTestCase(tests.unittest.TestCase):
(event_id, bytearray(b"ffff")),
)
for i in range(0, 11):
for i in range(0, 20):
yield self.store.db.runInteraction("insert", insert_event, i)
# this should get the last five and five others
# this should get the last ten
r = yield self.store.get_prev_events_for_room(room_id)
self.assertEqual(10, len(r))
for i in range(0, 5):
el = r[i]
depth = el[2]
self.assertEqual(10 - i, depth)
for i in range(5, 5):
el = r[i]
depth = el[2]
self.assertLessEqual(5, depth)
for i in range(0, 10):
self.assertEqual("$event_%i:local" % (19 - i), r[i])
@defer.inlineCallbacks
def test_get_rooms_with_many_extremities(self):

6
tests/unittest.py
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@ -531,10 +531,6 @@ class HomeserverTestCase(TestCase):
secrets = self.hs.get_secrets()
requester = Requester(user, None, False, None, None)
prev_events_and_hashes = None
if prev_event_ids:
prev_events_and_hashes = [[p, {}, 0] for p in prev_event_ids]
event, context = self.get_success(
event_creator.create_event(
requester,
@ -544,7 +540,7 @@ class HomeserverTestCase(TestCase):
"sender": user.to_string(),
"content": {"body": secrets.token_hex(), "msgtype": "m.text"},
},
prev_events_and_hashes=prev_events_and_hashes,
prev_event_ids=prev_event_ids,
)
)