387 lines
12 KiB
Python
387 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 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 ._base import SQLBaseStore
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from syutil.base64util import encode_base64
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import logging
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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_id):
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return self.runInteraction(
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"get_auth_chain",
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self._get_auth_chain_txn,
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event_id
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)
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def _get_auth_chain_txn(self, txn, event_id):
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results = self._get_auth_chain_ids_txn(txn, event_id)
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sql = "SELECT * FROM events WHERE event_id = ?"
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rows = []
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for ev_id in results:
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c = txn.execute(sql, (ev_id,))
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rows.extend(self.cursor_to_dict(c))
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return self._parse_events_txn(txn, rows)
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def get_auth_chain_ids(self, event_id):
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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_id
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)
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def _get_auth_chain_ids_txn(self, txn, event_id):
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results = set()
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base_sql = (
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"SELECT auth_id FROM event_auth WHERE %s"
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)
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front = set([event_id])
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while front:
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sql = base_sql % (
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" OR ".join(["event_id=?"] * len(front)),
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)
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txn.execute(sql, list(front))
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front = [r[0] for r in txn.fetchall()]
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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_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_events_in_room(self, room_id):
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return self.runInteraction(
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"get_latest_events_in_room",
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self._get_latest_events_in_room,
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room_id,
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)
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def _get_latest_events_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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"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_latest_state_in_room(self, txn, room_id, type, state_key):
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event_ids = self._simple_select_onecol_txn(
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txn,
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table="state_forward_extremities",
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keyvalues={
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"room_id": room_id,
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"type": type,
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"state_key": state_key,
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},
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retcol="event_id",
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)
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results = []
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for event_id in event_ids:
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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))
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return results
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def _get_prev_events(self, txn, event_id):
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results = self._get_prev_events_and_state(
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txn,
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event_id,
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is_state=0,
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)
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return [(e_id, h, ) for e_id, h, _ in results]
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def _get_prev_state(self, txn, event_id):
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results = self._get_prev_events_and_state(
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txn,
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event_id,
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is_state=1,
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)
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return [(e_id, h, ) for e_id, h, _ in results]
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def _get_prev_events_and_state(self, txn, event_id, is_state=None):
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keyvalues = {
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"event_id": event_id,
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}
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if is_state is not None:
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keyvalues["is_state"] = is_state
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res = self._simple_select_list_txn(
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txn,
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table="event_edges",
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keyvalues=keyvalues,
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retcols=["prev_event_id", "is_state"],
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)
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results = []
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for d in res:
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hashes = self._get_event_reference_hashes_txn(
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txn,
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d["prev_event_id"]
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)
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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((d["prev_event_id"], prev_hashes, d["is_state"]))
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return results
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def _get_auth_events(self, txn, event_id):
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auth_ids = self._simple_select_onecol_txn(
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txn,
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table="event_auth",
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keyvalues={
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"event_id": event_id,
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},
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retcol="auth_id",
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)
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results = []
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for auth_id in auth_ids:
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hashes = self._get_event_reference_hashes_txn(txn, auth_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((auth_id, prev_hashes))
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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_insert_txn(
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txn,
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table="room_depth",
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values={
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"room_id": room_id,
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"min_depth": depth,
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},
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or_replace=True,
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)
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def _handle_prev_events(self, txn, outlier, event_id, prev_events,
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room_id):
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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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for e_id, _ in prev_events:
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# TODO (erikj): This could be done as a bulk insert
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self._simple_insert_txn(
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txn,
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table="event_edges",
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values={
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"event_id": event_id,
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"prev_event_id": e_id,
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"room_id": room_id,
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"is_state": 0,
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},
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or_ignore=True,
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)
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# Update the extremities table if this is not an outlier.
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if not outlier:
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for e_id, _ in prev_events:
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# TODO (erikj): This could be done as a bulk insert
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self._simple_delete_txn(
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txn,
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table="event_forward_extremities",
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keyvalues={
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"event_id": e_id,
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"room_id": room_id,
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}
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)
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# We only insert as a forward extremity the new event if there are
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# no other events that reference it as a prev event
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query = (
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"INSERT OR IGNORE INTO %(table)s (event_id, room_id) "
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"SELECT ?, ? WHERE NOT EXISTS ("
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"SELECT 1 FROM %(event_edges)s WHERE "
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"prev_event_id = ? "
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")"
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) % {
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"table": "event_forward_extremities",
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"event_edges": "event_edges",
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}
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logger.debug("query: %s", query)
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txn.execute(query, (event_id, room_id, event_id))
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# Insert all the prev_events as a backwards thing, they'll get
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# deleted in a second if they're incorrect anyway.
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for e_id, _ in prev_events:
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# TODO (erikj): This could be done as a bulk insert
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self._simple_insert_txn(
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txn,
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table="event_backward_extremities",
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values={
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"event_id": e_id,
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"room_id": room_id,
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},
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or_ignore=True,
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)
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# Also delete from the backwards extremities table all ones that
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# reference events that we have already seen
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query = (
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"DELETE FROM event_backward_extremities WHERE EXISTS ("
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"SELECT 1 FROM events "
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"WHERE "
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"event_backward_extremities.event_id = events.event_id "
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"AND not events.outlier "
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")"
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)
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txn.execute(query)
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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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)
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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 = event_list
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front = event_list
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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 = ? "
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"LIMIT ?"
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)
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# We iterate through all event_ids in `front` to select their previous
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# events. These are dumped in `new_front`.
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# We continue until we reach the limit *or* new_front is empty (i.e.,
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# we've run out of things to select
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while front and len(event_results) < limit:
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new_front = []
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for event_id in front:
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logger.debug(
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"_backfill_interaction: id=%s",
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event_id
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)
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txn.execute(
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query,
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(room_id, event_id, limit - len(event_results))
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)
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for row in txn.fetchall():
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logger.debug(
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"_backfill_interaction: got id=%s",
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*row
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)
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new_front.append(row[0])
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front = new_front
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event_results += new_front
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return self._get_events_txn(txn, event_results)
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