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Refactor out state delta handling into its own class (#4917)

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Amber Brown 2019-03-25 20:37:08 +11:00 committed by GitHub
parent 5fee9d8067
commit ac396a0d32
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5 changed files with 152 additions and 110 deletions
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1
changelog.d/4917.misc Normal file
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@ -0,0 +1 @@
Refactor out the state deltas portion of the user directory store and handler.

70
synapse/handlers/state_deltas.py Normal file
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@ -0,0 +1,70 @@
# -*- coding: utf-8 -*-
# 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.
import logging
from twisted.internet import defer
logger = logging.getLogger(__name__)
class StateDeltasHandler(object):
def __init__(self, hs):
self.store = hs.get_datastore()
@defer.inlineCallbacks
def _get_key_change(self, prev_event_id, event_id, key_name, public_value):
"""Given two events check if the `key_name` field in content changed
from not matching `public_value` to doing so.
For example, check if `history_visibility` (`key_name`) changed from
`shared` to `world_readable` (`public_value`).
Returns:
None if the field in the events either both match `public_value`
or if neither do, i.e. there has been no change.
True if it didnt match `public_value` but now does
False if it did match `public_value` but now doesn't
"""
prev_event = None
event = None
if prev_event_id:
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if event_id:
event = yield self.store.get_event(event_id, allow_none=True)
if not event and not prev_event:
logger.debug("Neither event exists: %r %r", prev_event_id, event_id)
defer.returnValue(None)
prev_value = None
value = None
if prev_event:
prev_value = prev_event.content.get(key_name)
if event:
value = event.content.get(key_name)
logger.debug("prev_value: %r -> value: %r", prev_value, value)
if value == public_value and prev_value != public_value:
defer.returnValue(True)
elif value != public_value and prev_value == public_value:
defer.returnValue(False)
else:
defer.returnValue(None)

51
synapse/handlers/user_directory.py
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@ -21,6 +21,7 @@ from twisted.internet import defer
import synapse.metrics
from synapse.api.constants import EventTypes, JoinRules, Membership
from synapse.handlers.state_deltas import StateDeltasHandler
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage.roommember import ProfileInfo
from synapse.types import get_localpart_from_id
@ -29,7 +30,7 @@ from synapse.util.metrics import Measure
logger = logging.getLogger(__name__)
class UserDirectoryHandler(object):
class UserDirectoryHandler(StateDeltasHandler):
"""Handles querying of and keeping updated the user_directory.
N.B.: ASSUMES IT IS THE ONLY THING THAT MODIFIES THE USER DIRECTORY
@ -41,6 +42,8 @@ class UserDirectoryHandler(object):
"""
def __init__(self, hs):
super(UserDirectoryHandler, self).__init__(hs)
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.server_name = hs.hostname
@ -360,7 +363,7 @@ class UserDirectoryHandler(object):
@defer.inlineCallbacks
def _handle_remove_user(self, room_id, user_id):
"""Called when we might need to remove user to directory
"""Called when we might need to remove user from directory
Args:
room_id (str): room_id that user left or stopped being public that
@ -402,47 +405,3 @@ class UserDirectoryHandler(object):
if prev_name != new_name or prev_avatar != new_avatar:
yield self.store.update_profile_in_user_dir(user_id, new_name, new_avatar)
@defer.inlineCallbacks
def _get_key_change(self, prev_event_id, event_id, key_name, public_value):
"""Given two events check if the `key_name` field in content changed
from not matching `public_value` to doing so.
For example, check if `history_visibility` (`key_name`) changed from
`shared` to `world_readable` (`public_value`).
Returns:
None if the field in the events either both match `public_value`
or if neither do, i.e. there has been no change.
True if it didnt match `public_value` but now does
False if it did match `public_value` but now doesn't
"""
prev_event = None
event = None
if prev_event_id:
prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
if event_id:
event = yield self.store.get_event(event_id, allow_none=True)
if not event and not prev_event:
logger.debug("Neither event exists: %r %r", prev_event_id, event_id)
defer.returnValue(None)
prev_value = None
value = None
if prev_event:
prev_value = prev_event.content.get(key_name)
if event:
value = event.content.get(key_name)
logger.debug("prev_value: %r -> value: %r", prev_value, value)
if value == public_value and prev_value != public_value:
defer.returnValue(True)
elif value != public_value and prev_value == public_value:
defer.returnValue(False)
else:
defer.returnValue(None)

74
synapse/storage/state_deltas.py Normal file
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@ -0,0 +1,74 @@
# -*- coding: utf-8 -*-
# Copyright 2018 Vector Creations 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 synapse.storage._base import SQLBaseStore
logger = logging.getLogger(__name__)
class StateDeltasStore(SQLBaseStore):
def get_current_state_deltas(self, prev_stream_id):
prev_stream_id = int(prev_stream_id)
if not self._curr_state_delta_stream_cache.has_any_entity_changed(prev_stream_id):
return []
def get_current_state_deltas_txn(txn):
# First we calculate the max stream id that will give us less than
# N results.
# We arbitarily limit to 100 stream_id entries to ensure we don't
# select toooo many.
sql = """
SELECT stream_id, count(*)
FROM current_state_delta_stream
WHERE stream_id > ?
GROUP BY stream_id
ORDER BY stream_id ASC
LIMIT 100
"""
txn.execute(sql, (prev_stream_id,))
total = 0
max_stream_id = prev_stream_id
for max_stream_id, count in txn:
total += count
if total > 100:
# We arbitarily limit to 100 entries to ensure we don't
# select toooo many.
break
# Now actually get the deltas
sql = """
SELECT stream_id, room_id, type, state_key, event_id, prev_event_id
FROM current_state_delta_stream
WHERE ? < stream_id AND stream_id <= ?
ORDER BY stream_id ASC
"""
txn.execute(sql, (prev_stream_id, max_stream_id,))
return self.cursor_to_dict(txn)
return self.runInteraction(
"get_current_state_deltas", get_current_state_deltas_txn
)
def get_max_stream_id_in_current_state_deltas(self):
return self._simple_select_one_onecol(
table="current_state_delta_stream",
keyvalues={},
retcol="COALESCE(MAX(stream_id), -1)",
desc="get_max_stream_id_in_current_state_deltas",
)

66
synapse/storage/user_directory.py
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@ -22,6 +22,7 @@ from synapse.api.constants import EventTypes, JoinRules
from synapse.storage.background_updates import BackgroundUpdateStore
from synapse.storage.engines import PostgresEngine, Sqlite3Engine
from synapse.storage.state import StateFilter
from synapse.storage.state_deltas import StateDeltasStore
from synapse.types import get_domain_from_id, get_localpart_from_id
from synapse.util.caches.descriptors import cached
@ -31,7 +32,7 @@ logger = logging.getLogger(__name__)
TEMP_TABLE = "_temp_populate_user_directory"
class UserDirectoryStore(BackgroundUpdateStore):
class UserDirectoryStore(StateDeltasStore, BackgroundUpdateStore):
# How many records do we calculate before sending it to
# add_users_who_share_private_rooms?
@ -488,16 +489,6 @@ class UserDirectoryStore(BackgroundUpdateStore):
defer.returnValue(user_ids)
@defer.inlineCallbacks
def get_all_local_users(self):
"""Get all local users
"""
sql = """
SELECT name FROM users
"""
rows = yield self._execute("get_all_local_users", None, sql)
defer.returnValue([name for name, in rows])
def add_users_who_share_private_room(self, room_id, user_id_tuples):
"""Insert entries into the users_who_share_private_rooms table. The first
user should be a local user.
@ -675,59 +666,6 @@ class UserDirectoryStore(BackgroundUpdateStore):
desc="update_user_directory_stream_pos",
)
def get_current_state_deltas(self, prev_stream_id):
prev_stream_id = int(prev_stream_id)
if not self._curr_state_delta_stream_cache.has_any_entity_changed(
prev_stream_id
):
return []
def get_current_state_deltas_txn(txn):
# First we calculate the max stream id that will give us less than
# N results.
# We arbitarily limit to 100 stream_id entries to ensure we don't
# select toooo many.
sql = """
SELECT stream_id, count(*)
FROM current_state_delta_stream
WHERE stream_id > ?
GROUP BY stream_id
ORDER BY stream_id ASC
LIMIT 100
"""
txn.execute(sql, (prev_stream_id,))
total = 0
max_stream_id = prev_stream_id
for max_stream_id, count in txn:
total += count
if total > 100:
# We arbitarily limit to 100 entries to ensure we don't
# select toooo many.
break
# Now actually get the deltas
sql = """
SELECT stream_id, room_id, type, state_key, event_id, prev_event_id
FROM current_state_delta_stream
WHERE ? < stream_id AND stream_id <= ?
ORDER BY stream_id ASC
"""
txn.execute(sql, (prev_stream_id, max_stream_id))
return self.cursor_to_dict(txn)
return self.runInteraction(
"get_current_state_deltas", get_current_state_deltas_txn
)
def get_max_stream_id_in_current_state_deltas(self):
return self._simple_select_one_onecol(
table="current_state_delta_stream",
keyvalues={},
retcol="COALESCE(MAX(stream_id), -1)",
desc="get_max_stream_id_in_current_state_deltas",
)
@defer.inlineCallbacks
def search_user_dir(self, user_id, search_term, limit):
"""Searches for users in directory