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![Erik Johnston](/assets/img/avatar_default.png)
The aim here is to make it easier to reason about when streams are limited and when they're not, by moving the logic into the database functions themselves. This should mean we can kill of `db_query_to_update_function` function.
187 lines
6.7 KiB
Python
187 lines
6.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import List, Tuple
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from twisted.internet import defer
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from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
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from synapse.storage.presence import UserPresenceState
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from synapse.util.caches.descriptors import cached, cachedList
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from synapse.util.iterutils import batch_iter
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class PresenceStore(SQLBaseStore):
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@defer.inlineCallbacks
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def update_presence(self, presence_states):
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stream_ordering_manager = self._presence_id_gen.get_next_mult(
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len(presence_states)
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)
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with stream_ordering_manager as stream_orderings:
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yield self.db.runInteraction(
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"update_presence",
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self._update_presence_txn,
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stream_orderings,
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presence_states,
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)
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return stream_orderings[-1], self._presence_id_gen.get_current_token()
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def _update_presence_txn(self, txn, stream_orderings, presence_states):
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for stream_id, state in zip(stream_orderings, presence_states):
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txn.call_after(
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self.presence_stream_cache.entity_has_changed, state.user_id, stream_id
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)
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txn.call_after(self._get_presence_for_user.invalidate, (state.user_id,))
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# Actually insert new rows
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self.db.simple_insert_many_txn(
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txn,
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table="presence_stream",
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values=[
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{
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"stream_id": stream_id,
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"user_id": state.user_id,
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"state": state.state,
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"last_active_ts": state.last_active_ts,
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"last_federation_update_ts": state.last_federation_update_ts,
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"last_user_sync_ts": state.last_user_sync_ts,
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"status_msg": state.status_msg,
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"currently_active": state.currently_active,
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}
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for stream_id, state in zip(stream_orderings, presence_states)
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],
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)
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# Delete old rows to stop database from getting really big
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sql = "DELETE FROM presence_stream WHERE stream_id < ? AND "
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for states in batch_iter(presence_states, 50):
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clause, args = make_in_list_sql_clause(
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self.database_engine, "user_id", [s.user_id for s in states]
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)
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txn.execute(sql + clause, [stream_id] + list(args))
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async def get_all_presence_updates(
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self, instance_name: str, last_id: int, current_id: int, limit: int
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) -> Tuple[List[Tuple[int, list]], int, bool]:
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"""Get updates for presence replication stream.
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Args:
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instance_name: The writer we want to fetch updates from. Unused
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here since there is only ever one writer.
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last_id: The token to fetch updates from. Exclusive.
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current_id: The token to fetch updates up to. Inclusive.
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limit: The requested limit for the number of rows to return. The
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function may return more or fewer rows.
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Returns:
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A tuple consisting of: the updates, a token to use to fetch
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subsequent updates, and whether we returned fewer rows than exists
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between the requested tokens due to the limit.
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The token returned can be used in a subsequent call to this
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function to get further updatees.
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The updates are a list of 2-tuples of stream ID and the row data
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"""
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if last_id == current_id:
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return [], current_id, False
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def get_all_presence_updates_txn(txn):
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sql = """
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SELECT stream_id, user_id, state, last_active_ts,
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last_federation_update_ts, last_user_sync_ts,
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status_msg,
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currently_active
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FROM presence_stream
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WHERE ? < stream_id AND stream_id <= ?
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ORDER BY stream_id ASC
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LIMIT ?
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"""
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txn.execute(sql, (last_id, current_id, limit))
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updates = [(row[0], row[1:]) for row in txn]
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upper_bound = current_id
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limited = False
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if len(updates) >= limit:
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upper_bound = updates[-1][0]
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limited = True
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return updates, upper_bound, limited
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return await self.db.runInteraction(
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"get_all_presence_updates", get_all_presence_updates_txn
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)
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@cached()
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def _get_presence_for_user(self, user_id):
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raise NotImplementedError()
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@cachedList(
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cached_method_name="_get_presence_for_user",
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list_name="user_ids",
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num_args=1,
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inlineCallbacks=True,
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)
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def get_presence_for_users(self, user_ids):
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rows = yield self.db.simple_select_many_batch(
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table="presence_stream",
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column="user_id",
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iterable=user_ids,
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keyvalues={},
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retcols=(
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"user_id",
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"state",
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"last_active_ts",
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"last_federation_update_ts",
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"last_user_sync_ts",
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"status_msg",
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"currently_active",
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),
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desc="get_presence_for_users",
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)
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for row in rows:
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row["currently_active"] = bool(row["currently_active"])
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return {row["user_id"]: UserPresenceState(**row) for row in rows}
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def get_current_presence_token(self):
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return self._presence_id_gen.get_current_token()
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def allow_presence_visible(self, observed_localpart, observer_userid):
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return self.db.simple_insert(
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table="presence_allow_inbound",
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values={
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"observed_user_id": observed_localpart,
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"observer_user_id": observer_userid,
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},
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desc="allow_presence_visible",
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or_ignore=True,
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)
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def disallow_presence_visible(self, observed_localpart, observer_userid):
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return self.db.simple_delete_one(
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table="presence_allow_inbound",
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keyvalues={
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"observed_user_id": observed_localpart,
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"observer_user_id": observer_userid,
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},
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desc="disallow_presence_visible",
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)
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