433 lines
13 KiB
Python
433 lines
13 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 twisted.internet import defer
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from ._base import SQLBaseStore
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from synapse.util.caches.descriptors import cached
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from unpaddedbase64 import encode_base64
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import logging
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from Queue import PriorityQueue, Empty
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logger = logging.getLogger(__name__)
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class EventFederationStore(SQLBaseStore):
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""" Responsible for storing and serving up the various graphs associated
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with an event. Including the main event graph and the auth chains for an
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event.
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Also has methods for getting the front (latest) and back (oldest) edges
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of the event graphs. These are used to generate the parents for new events
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and backfilling from another server respectively.
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"""
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def get_auth_chain(self, event_ids):
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return self.get_auth_chain_ids(event_ids).addCallback(self._get_events)
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def get_auth_chain_ids(self, event_ids):
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return self.runInteraction(
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"get_auth_chain_ids",
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self._get_auth_chain_ids_txn,
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event_ids
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)
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def _get_auth_chain_ids_txn(self, txn, event_ids):
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results = set()
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base_sql = (
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"SELECT auth_id FROM event_auth WHERE event_id IN (%s)"
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)
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front = set(event_ids)
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while front:
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new_front = set()
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front_list = list(front)
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chunks = [
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front_list[x:x + 100]
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for x in xrange(0, len(front), 100)
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]
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for chunk in chunks:
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txn.execute(
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base_sql % (",".join(["?"] * len(chunk)),),
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chunk
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)
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new_front.update([r[0] for r in txn.fetchall()])
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new_front -= results
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front = new_front
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results.update(front)
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return list(results)
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def get_oldest_events_in_room(self, room_id):
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return self.runInteraction(
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"get_oldest_events_in_room",
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self._get_oldest_events_in_room_txn,
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room_id,
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)
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def get_oldest_events_with_depth_in_room(self, room_id):
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return self.runInteraction(
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"get_oldest_events_with_depth_in_room",
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self.get_oldest_events_with_depth_in_room_txn,
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room_id,
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)
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def get_oldest_events_with_depth_in_room_txn(self, txn, room_id):
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sql = (
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"SELECT b.event_id, MAX(e.depth) FROM events as e"
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" INNER JOIN event_edges as g"
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" ON g.event_id = e.event_id AND g.room_id = e.room_id"
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" INNER JOIN event_backward_extremities as b"
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" ON g.prev_event_id = b.event_id AND g.room_id = b.room_id"
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" WHERE b.room_id = ? AND g.is_state is ?"
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" GROUP BY b.event_id"
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)
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txn.execute(sql, (room_id, False,))
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return dict(txn.fetchall())
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def _get_oldest_events_in_room_txn(self, txn, room_id):
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return self._simple_select_onecol_txn(
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txn,
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table="event_backward_extremities",
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keyvalues={
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"room_id": room_id,
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},
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retcol="event_id",
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)
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def get_latest_event_ids_and_hashes_in_room(self, room_id):
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return self.runInteraction(
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"get_latest_event_ids_and_hashes_in_room",
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self._get_latest_event_ids_and_hashes_in_room,
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room_id,
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)
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@cached()
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def get_latest_event_ids_in_room(self, room_id):
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return self._simple_select_onecol(
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table="event_forward_extremities",
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keyvalues={
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"room_id": room_id,
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},
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retcol="event_id",
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desc="get_latest_event_ids_in_room",
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)
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def _get_latest_event_ids_and_hashes_in_room(self, txn, room_id):
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sql = (
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"SELECT e.event_id, e.depth FROM events as e "
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"INNER JOIN event_forward_extremities as f "
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"ON e.event_id = f.event_id "
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"AND e.room_id = f.room_id "
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"WHERE f.room_id = ?"
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)
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txn.execute(sql, (room_id, ))
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results = []
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for event_id, depth in txn.fetchall():
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hashes = self._get_event_reference_hashes_txn(txn, event_id)
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prev_hashes = {
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k: encode_base64(v) for k, v in hashes.items()
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if k == "sha256"
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}
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results.append((event_id, prev_hashes, depth))
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return results
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def get_min_depth(self, room_id):
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""" For hte given room, get the minimum depth we have seen for it.
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"""
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return self.runInteraction(
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"get_min_depth",
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self._get_min_depth_interaction,
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room_id,
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)
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def _get_min_depth_interaction(self, txn, room_id):
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min_depth = self._simple_select_one_onecol_txn(
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txn,
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table="room_depth",
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keyvalues={"room_id": room_id},
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retcol="min_depth",
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allow_none=True,
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)
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return int(min_depth) if min_depth is not None else None
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def _update_min_depth_for_room_txn(self, txn, room_id, depth):
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min_depth = self._get_min_depth_interaction(txn, room_id)
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do_insert = depth < min_depth if min_depth else True
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if do_insert:
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self._simple_upsert_txn(
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txn,
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table="room_depth",
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keyvalues={
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"room_id": room_id,
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},
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values={
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"min_depth": depth,
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},
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)
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def _handle_mult_prev_events(self, txn, events):
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"""
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For the given event, update the event edges table and forward and
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backward extremities tables.
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"""
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self._simple_insert_many_txn(
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txn,
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table="event_edges",
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values=[
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{
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"event_id": ev.event_id,
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"prev_event_id": e_id,
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"room_id": ev.room_id,
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"is_state": False,
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}
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for ev in events
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for e_id, _ in ev.prev_events
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],
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)
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self._update_extremeties(txn, events)
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def _update_extremeties(self, txn, events):
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"""Updates the event_*_extremities tables based on the new/updated
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events being persisted.
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This is called for new events *and* for events that were outliers, but
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are are now being persisted as non-outliers.
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"""
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events_by_room = {}
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for ev in events:
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events_by_room.setdefault(ev.room_id, []).append(ev)
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for room_id, room_events in events_by_room.items():
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prevs = [
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e_id for ev in room_events for e_id, _ in ev.prev_events
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if not ev.internal_metadata.is_outlier()
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]
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if prevs:
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txn.execute(
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"DELETE FROM event_forward_extremities"
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" WHERE room_id = ?"
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" AND event_id in (%s)" % (
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",".join(["?"] * len(prevs)),
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),
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[room_id] + prevs,
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)
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query = (
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"INSERT INTO event_forward_extremities (event_id, room_id)"
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" SELECT ?, ? WHERE NOT EXISTS ("
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" SELECT 1 FROM event_edges WHERE prev_event_id = ?"
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" )"
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)
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txn.executemany(
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query,
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[
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(ev.event_id, ev.room_id, ev.event_id) for ev in events
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if not ev.internal_metadata.is_outlier()
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]
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)
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query = (
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"INSERT INTO event_backward_extremities (event_id, room_id)"
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" SELECT ?, ? WHERE NOT EXISTS ("
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" SELECT 1 FROM event_backward_extremities"
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" WHERE event_id = ? AND room_id = ?"
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" )"
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" AND NOT EXISTS ("
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" SELECT 1 FROM events WHERE event_id = ? AND room_id = ? "
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" AND outlier = ?"
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" )"
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)
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txn.executemany(query, [
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(e_id, ev.room_id, e_id, ev.room_id, e_id, ev.room_id, False)
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for ev in events for e_id, _ in ev.prev_events
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if not ev.internal_metadata.is_outlier()
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])
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query = (
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"DELETE FROM event_backward_extremities"
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" WHERE event_id = ? AND room_id = ?"
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)
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txn.executemany(
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query,
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[
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(ev.event_id, ev.room_id) for ev in events
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if not ev.internal_metadata.is_outlier()
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]
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)
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for room_id in events_by_room:
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txn.call_after(
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self.get_latest_event_ids_in_room.invalidate, (room_id,)
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)
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def get_backfill_events(self, room_id, event_list, limit):
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"""Get a list of Events for a given topic that occurred before (and
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including) the events in event_list. Return a list of max size `limit`
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Args:
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txn
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room_id (str)
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event_list (list)
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limit (int)
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"""
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return self.runInteraction(
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"get_backfill_events",
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self._get_backfill_events, room_id, event_list, limit
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).addCallback(
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self._get_events
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).addCallback(
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lambda l: sorted(l, key=lambda e: -e.depth)
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)
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def _get_backfill_events(self, txn, room_id, event_list, limit):
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logger.debug(
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"_get_backfill_events: %s, %s, %s",
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room_id, repr(event_list), limit
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)
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event_results = set()
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# We want to make sure that we do a breadth-first, "depth" ordered
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# search.
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query = (
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"SELECT depth, prev_event_id FROM event_edges"
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" INNER JOIN events"
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" ON prev_event_id = events.event_id"
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" AND event_edges.room_id = events.room_id"
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" WHERE event_edges.room_id = ? AND event_edges.event_id = ?"
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" AND event_edges.is_state = ?"
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" LIMIT ?"
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)
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queue = PriorityQueue()
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for event_id in event_list:
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depth = self._simple_select_one_onecol_txn(
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txn,
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table="events",
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keyvalues={
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"event_id": event_id,
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},
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retcol="depth",
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allow_none=True,
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)
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if depth:
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queue.put((-depth, event_id))
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while not queue.empty() and len(event_results) < limit:
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try:
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_, event_id = queue.get_nowait()
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except Empty:
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break
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if event_id in event_results:
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continue
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event_results.add(event_id)
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txn.execute(
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query,
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(room_id, event_id, False, limit - len(event_results))
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)
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for row in txn.fetchall():
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if row[1] not in event_results:
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queue.put((-row[0], row[1]))
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return event_results
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@defer.inlineCallbacks
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def get_missing_events(self, room_id, earliest_events, latest_events,
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limit, min_depth):
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ids = yield self.runInteraction(
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"get_missing_events",
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self._get_missing_events,
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room_id, earliest_events, latest_events, limit, min_depth
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)
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events = yield self._get_events(ids)
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events = sorted(
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[ev for ev in events if ev.depth >= min_depth],
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key=lambda e: e.depth,
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)
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defer.returnValue(events[:limit])
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def _get_missing_events(self, txn, room_id, earliest_events, latest_events,
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limit, min_depth):
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earliest_events = set(earliest_events)
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front = set(latest_events) - earliest_events
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event_results = set()
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query = (
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"SELECT prev_event_id FROM event_edges "
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"WHERE room_id = ? AND event_id = ? AND is_state = ? "
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"LIMIT ?"
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)
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while front and len(event_results) < limit:
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new_front = set()
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for event_id in front:
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txn.execute(
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query,
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(room_id, event_id, False, limit - len(event_results))
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)
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for e_id, in txn.fetchall():
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new_front.add(e_id)
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new_front -= earliest_events
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new_front -= event_results
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front = new_front
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event_results |= new_front
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return event_results
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def clean_room_for_join(self, room_id):
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return self.runInteraction(
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"clean_room_for_join",
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self._clean_room_for_join_txn,
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room_id,
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)
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def _clean_room_for_join_txn(self, txn, room_id):
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query = "DELETE FROM event_forward_extremities WHERE room_id = ?"
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txn.execute(query, (room_id,))
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txn.call_after(self.get_latest_event_ids_in_room.invalidate, (room_id,))
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