656 lines
24 KiB
Python
656 lines
24 KiB
Python
# 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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import logging
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from collections import namedtuple
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from typing import Dict, Iterable, List, Optional, Set, Tuple
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from synapse.api.constants import EventTypes
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.database import DatabasePool
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from synapse.storage.databases.state.bg_updates import StateBackgroundUpdateStore
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from synapse.storage.state import StateFilter
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from synapse.storage.types import Cursor
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from synapse.storage.util.sequence import build_sequence_generator
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from synapse.types import MutableStateMap, StateMap
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from synapse.util.caches.descriptors import cached
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from synapse.util.caches.dictionary_cache import DictionaryCache
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logger = logging.getLogger(__name__)
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MAX_STATE_DELTA_HOPS = 100
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class _GetStateGroupDelta(
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namedtuple("_GetStateGroupDelta", ("prev_group", "delta_ids"))
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):
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"""Return type of get_state_group_delta that implements __len__, which lets
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us use the itrable flag when caching
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"""
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__slots__ = []
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def __len__(self):
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return len(self.delta_ids) if self.delta_ids else 0
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class StateGroupDataStore(StateBackgroundUpdateStore, SQLBaseStore):
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"""A data store for fetching/storing state groups."""
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def __init__(self, database: DatabasePool, db_conn, hs):
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super().__init__(database, db_conn, hs)
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# Originally the state store used a single DictionaryCache to cache the
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# event IDs for the state types in a given state group to avoid hammering
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# on the state_group* tables.
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#
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# The point of using a DictionaryCache is that it can cache a subset
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# of the state events for a given state group (i.e. a subset of the keys for a
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# given dict which is an entry in the cache for a given state group ID).
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#
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# However, this poses problems when performing complicated queries
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# on the store - for instance: "give me all the state for this group, but
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# limit members to this subset of users", as DictionaryCache's API isn't
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# rich enough to say "please cache any of these fields, apart from this subset".
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# This is problematic when lazy loading members, which requires this behaviour,
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# as without it the cache has no choice but to speculatively load all
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# state events for the group, which negates the efficiency being sought.
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#
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# Rather than overcomplicating DictionaryCache's API, we instead split the
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# state_group_cache into two halves - one for tracking non-member events,
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# and the other for tracking member_events. This means that lazy loading
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# queries can be made in a cache-friendly manner by querying both caches
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# separately and then merging the result. So for the example above, you
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# would query the members cache for a specific subset of state keys
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# (which DictionaryCache will handle efficiently and fine) and the non-members
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# cache for all state (which DictionaryCache will similarly handle fine)
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# and then just merge the results together.
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#
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# We size the non-members cache to be smaller than the members cache as the
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# vast majority of state in Matrix (today) is member events.
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self._state_group_cache = DictionaryCache(
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"*stateGroupCache*",
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# TODO: this hasn't been tuned yet
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50000,
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)
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self._state_group_members_cache = DictionaryCache(
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"*stateGroupMembersCache*",
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500000,
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)
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def get_max_state_group_txn(txn: Cursor):
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txn.execute("SELECT COALESCE(max(id), 0) FROM state_groups")
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return txn.fetchone()[0]
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self._state_group_seq_gen = build_sequence_generator(
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db_conn,
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self.database_engine,
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get_max_state_group_txn,
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"state_group_id_seq",
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table="state_groups",
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id_column="id",
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)
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@cached(max_entries=10000, iterable=True)
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async def get_state_group_delta(self, state_group):
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"""Given a state group try to return a previous group and a delta between
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the old and the new.
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Returns:
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(prev_group, delta_ids), where both may be None.
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"""
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def _get_state_group_delta_txn(txn):
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prev_group = self.db_pool.simple_select_one_onecol_txn(
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txn,
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table="state_group_edges",
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keyvalues={"state_group": state_group},
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retcol="prev_state_group",
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allow_none=True,
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)
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if not prev_group:
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return _GetStateGroupDelta(None, None)
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delta_ids = self.db_pool.simple_select_list_txn(
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txn,
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table="state_groups_state",
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keyvalues={"state_group": state_group},
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retcols=("type", "state_key", "event_id"),
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)
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return _GetStateGroupDelta(
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prev_group,
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{(row["type"], row["state_key"]): row["event_id"] for row in delta_ids},
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)
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return await self.db_pool.runInteraction(
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"get_state_group_delta", _get_state_group_delta_txn
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)
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async def _get_state_groups_from_groups(
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self, groups: List[int], state_filter: StateFilter
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) -> Dict[int, StateMap[str]]:
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"""Returns the state groups for a given set of groups from the
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database, filtering on types of state events.
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Args:
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groups: list of state group IDs to query
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state_filter: The state filter used to fetch state
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from the database.
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Returns:
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Dict of state group to state map.
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"""
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results = {}
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chunks = [groups[i : i + 100] for i in range(0, len(groups), 100)]
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for chunk in chunks:
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res = await self.db_pool.runInteraction(
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"_get_state_groups_from_groups",
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self._get_state_groups_from_groups_txn,
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chunk,
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state_filter,
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)
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results.update(res)
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return results
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def _get_state_for_group_using_cache(self, cache, group, state_filter):
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"""Checks if group is in cache. See `_get_state_for_groups`
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Args:
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cache(DictionaryCache): the state group cache to use
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group(int): The state group to lookup
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state_filter (StateFilter): The state filter used to fetch state
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from the database.
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Returns 2-tuple (`state_dict`, `got_all`).
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`got_all` is a bool indicating if we successfully retrieved all
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requests state from the cache, if False we need to query the DB for the
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missing state.
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"""
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cache_entry = cache.get(group)
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state_dict_ids = cache_entry.value
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if cache_entry.full or state_filter.is_full():
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# Either we have everything or want everything, either way
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# `is_all` tells us whether we've gotten everything.
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return state_filter.filter_state(state_dict_ids), cache_entry.full
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# tracks whether any of our requested types are missing from the cache
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missing_types = False
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if state_filter.has_wildcards():
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# We don't know if we fetched all the state keys for the types in
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# the filter that are wildcards, so we have to assume that we may
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# have missed some.
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missing_types = True
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else:
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# There aren't any wild cards, so `concrete_types()` returns the
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# complete list of event types we're wanting.
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for key in state_filter.concrete_types():
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if key not in state_dict_ids and key not in cache_entry.known_absent:
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missing_types = True
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break
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return state_filter.filter_state(state_dict_ids), not missing_types
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async def _get_state_for_groups(
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self, groups: Iterable[int], state_filter: Optional[StateFilter] = None
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) -> Dict[int, MutableStateMap[str]]:
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"""Gets the state at each of a list of state groups, optionally
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filtering by type/state_key
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Args:
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groups: list of state groups for which we want
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to get the state.
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state_filter: The state filter used to fetch state
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from the database.
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Returns:
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Dict of state group to state map.
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"""
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state_filter = state_filter or StateFilter.all()
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member_filter, non_member_filter = state_filter.get_member_split()
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# Now we look them up in the member and non-member caches
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(
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non_member_state,
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incomplete_groups_nm,
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) = self._get_state_for_groups_using_cache(
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groups, self._state_group_cache, state_filter=non_member_filter
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)
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(member_state, incomplete_groups_m,) = self._get_state_for_groups_using_cache(
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groups, self._state_group_members_cache, state_filter=member_filter
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)
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state = dict(non_member_state)
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for group in groups:
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state[group].update(member_state[group])
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# Now fetch any missing groups from the database
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incomplete_groups = incomplete_groups_m | incomplete_groups_nm
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if not incomplete_groups:
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return state
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cache_sequence_nm = self._state_group_cache.sequence
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cache_sequence_m = self._state_group_members_cache.sequence
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# Help the cache hit ratio by expanding the filter a bit
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db_state_filter = state_filter.return_expanded()
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group_to_state_dict = await self._get_state_groups_from_groups(
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list(incomplete_groups), state_filter=db_state_filter
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)
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# Now lets update the caches
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self._insert_into_cache(
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group_to_state_dict,
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db_state_filter,
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cache_seq_num_members=cache_sequence_m,
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cache_seq_num_non_members=cache_sequence_nm,
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)
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# And finally update the result dict, by filtering out any extra
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# stuff we pulled out of the database.
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for group, group_state_dict in group_to_state_dict.items():
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# We just replace any existing entries, as we will have loaded
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# everything we need from the database anyway.
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state[group] = state_filter.filter_state(group_state_dict)
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return state
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def _get_state_for_groups_using_cache(
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self, groups: Iterable[int], cache: DictionaryCache, state_filter: StateFilter
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) -> Tuple[Dict[int, StateMap[str]], Set[int]]:
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"""Gets the state at each of a list of state groups, optionally
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filtering by type/state_key, querying from a specific cache.
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Args:
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groups: list of state groups for which we want to get the state.
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cache: the cache of group ids to state dicts which
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we will pass through - either the normal state cache or the
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specific members state cache.
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state_filter: The state filter used to fetch state from the
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database.
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Returns:
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Tuple of dict of state_group_id to state map of entries in the
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cache, and the state group ids either missing from the cache or
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incomplete.
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"""
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results = {}
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incomplete_groups = set()
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for group in set(groups):
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state_dict_ids, got_all = self._get_state_for_group_using_cache(
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cache, group, state_filter
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)
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results[group] = state_dict_ids
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if not got_all:
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incomplete_groups.add(group)
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return results, incomplete_groups
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def _insert_into_cache(
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self,
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group_to_state_dict,
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state_filter,
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cache_seq_num_members,
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cache_seq_num_non_members,
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):
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"""Inserts results from querying the database into the relevant cache.
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Args:
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group_to_state_dict (dict): The new entries pulled from database.
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Map from state group to state dict
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state_filter (StateFilter): The state filter used to fetch state
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from the database.
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cache_seq_num_members (int): Sequence number of member cache since
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last lookup in cache
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cache_seq_num_non_members (int): Sequence number of member cache since
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last lookup in cache
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"""
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# We need to work out which types we've fetched from the DB for the
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# member vs non-member caches. This should be as accurate as possible,
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# but can be an underestimate (e.g. when we have wild cards)
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member_filter, non_member_filter = state_filter.get_member_split()
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if member_filter.is_full():
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# We fetched all member events
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member_types = None
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else:
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# `concrete_types()` will only return a subset when there are wild
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# cards in the filter, but that's fine.
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member_types = member_filter.concrete_types()
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if non_member_filter.is_full():
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# We fetched all non member events
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non_member_types = None
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else:
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non_member_types = non_member_filter.concrete_types()
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for group, group_state_dict in group_to_state_dict.items():
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state_dict_members = {}
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state_dict_non_members = {}
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for k, v in group_state_dict.items():
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if k[0] == EventTypes.Member:
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state_dict_members[k] = v
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else:
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state_dict_non_members[k] = v
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self._state_group_members_cache.update(
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cache_seq_num_members,
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key=group,
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value=state_dict_members,
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fetched_keys=member_types,
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)
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self._state_group_cache.update(
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cache_seq_num_non_members,
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key=group,
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value=state_dict_non_members,
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fetched_keys=non_member_types,
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)
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async def store_state_group(
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self,
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event_id: str,
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room_id: str,
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prev_group: Optional[int],
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delta_ids: Optional[StateMap[str]],
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current_state_ids: StateMap[str],
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) -> int:
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"""Store a new set of state, returning a newly assigned state group.
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Args:
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event_id: The event ID for which the state was calculated
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room_id
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prev_group: A previous state group for the room, optional.
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delta_ids: The delta between state at `prev_group` and
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`current_state_ids`, if `prev_group` was given. Same format as
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`current_state_ids`.
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current_state_ids: The state to store. Map of (type, state_key)
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to event_id.
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Returns:
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The state group ID
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"""
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def _store_state_group_txn(txn):
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if current_state_ids is None:
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# AFAIK, this can never happen
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raise Exception("current_state_ids cannot be None")
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state_group = self._state_group_seq_gen.get_next_id_txn(txn)
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self.db_pool.simple_insert_txn(
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txn,
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table="state_groups",
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values={"id": state_group, "room_id": room_id, "event_id": event_id},
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)
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# We persist as a delta if we can, while also ensuring the chain
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# of deltas isn't tooo long, as otherwise read performance degrades.
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if prev_group:
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is_in_db = self.db_pool.simple_select_one_onecol_txn(
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txn,
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table="state_groups",
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keyvalues={"id": prev_group},
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retcol="id",
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allow_none=True,
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)
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if not is_in_db:
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raise Exception(
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"Trying to persist state with unpersisted prev_group: %r"
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% (prev_group,)
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)
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potential_hops = self._count_state_group_hops_txn(txn, prev_group)
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if prev_group and potential_hops < MAX_STATE_DELTA_HOPS:
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self.db_pool.simple_insert_txn(
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txn,
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table="state_group_edges",
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values={"state_group": state_group, "prev_state_group": prev_group},
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)
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self.db_pool.simple_insert_many_txn(
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txn,
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table="state_groups_state",
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values=[
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{
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"state_group": state_group,
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"room_id": room_id,
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"type": key[0],
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"state_key": key[1],
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"event_id": state_id,
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}
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for key, state_id in delta_ids.items()
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],
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)
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else:
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self.db_pool.simple_insert_many_txn(
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txn,
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table="state_groups_state",
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values=[
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{
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"state_group": state_group,
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"room_id": room_id,
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"type": key[0],
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"state_key": key[1],
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"event_id": state_id,
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}
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for key, state_id in current_state_ids.items()
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],
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)
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# Prefill the state group caches with this group.
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# It's fine to use the sequence like this as the state group map
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# is immutable. (If the map wasn't immutable then this prefill could
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# race with another update)
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current_member_state_ids = {
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s: ev
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for (s, ev) in current_state_ids.items()
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if s[0] == EventTypes.Member
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}
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txn.call_after(
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self._state_group_members_cache.update,
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self._state_group_members_cache.sequence,
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key=state_group,
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value=dict(current_member_state_ids),
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)
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current_non_member_state_ids = {
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s: ev
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for (s, ev) in current_state_ids.items()
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if s[0] != EventTypes.Member
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}
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txn.call_after(
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self._state_group_cache.update,
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self._state_group_cache.sequence,
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key=state_group,
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value=dict(current_non_member_state_ids),
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)
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return state_group
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return await self.db_pool.runInteraction(
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"store_state_group", _store_state_group_txn
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)
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async def purge_unreferenced_state_groups(
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self, room_id: str, state_groups_to_delete
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) -> None:
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"""Deletes no longer referenced state groups and de-deltas any state
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groups that reference them.
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Args:
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room_id: The room the state groups belong to (must all be in the
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same room).
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state_groups_to_delete (Collection[int]): Set of all state groups
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to delete.
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"""
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await self.db_pool.runInteraction(
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"purge_unreferenced_state_groups",
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self._purge_unreferenced_state_groups,
|
|
room_id,
|
|
state_groups_to_delete,
|
|
)
|
|
|
|
def _purge_unreferenced_state_groups(self, txn, room_id, state_groups_to_delete):
|
|
logger.info(
|
|
"[purge] found %i state groups to delete", len(state_groups_to_delete)
|
|
)
|
|
|
|
rows = self.db_pool.simple_select_many_txn(
|
|
txn,
|
|
table="state_group_edges",
|
|
column="prev_state_group",
|
|
iterable=state_groups_to_delete,
|
|
keyvalues={},
|
|
retcols=("state_group",),
|
|
)
|
|
|
|
remaining_state_groups = {
|
|
row["state_group"]
|
|
for row in rows
|
|
if row["state_group"] not in state_groups_to_delete
|
|
}
|
|
|
|
logger.info(
|
|
"[purge] de-delta-ing %i remaining state groups",
|
|
len(remaining_state_groups),
|
|
)
|
|
|
|
# Now we turn the state groups that reference to-be-deleted state
|
|
# groups to non delta versions.
|
|
for sg in remaining_state_groups:
|
|
logger.info("[purge] de-delta-ing remaining state group %s", sg)
|
|
curr_state = self._get_state_groups_from_groups_txn(txn, [sg])
|
|
curr_state = curr_state[sg]
|
|
|
|
self.db_pool.simple_delete_txn(
|
|
txn, table="state_groups_state", keyvalues={"state_group": sg}
|
|
)
|
|
|
|
self.db_pool.simple_delete_txn(
|
|
txn, table="state_group_edges", keyvalues={"state_group": sg}
|
|
)
|
|
|
|
self.db_pool.simple_insert_many_txn(
|
|
txn,
|
|
table="state_groups_state",
|
|
values=[
|
|
{
|
|
"state_group": sg,
|
|
"room_id": room_id,
|
|
"type": key[0],
|
|
"state_key": key[1],
|
|
"event_id": state_id,
|
|
}
|
|
for key, state_id in curr_state.items()
|
|
],
|
|
)
|
|
|
|
logger.info("[purge] removing redundant state groups")
|
|
txn.execute_batch(
|
|
"DELETE FROM state_groups_state WHERE state_group = ?",
|
|
((sg,) for sg in state_groups_to_delete),
|
|
)
|
|
txn.execute_batch(
|
|
"DELETE FROM state_groups WHERE id = ?",
|
|
((sg,) for sg in state_groups_to_delete),
|
|
)
|
|
|
|
async def get_previous_state_groups(
|
|
self, state_groups: Iterable[int]
|
|
) -> Dict[int, int]:
|
|
"""Fetch the previous groups of the given state groups.
|
|
|
|
Args:
|
|
state_groups
|
|
|
|
Returns:
|
|
A mapping from state group to previous state group.
|
|
"""
|
|
|
|
rows = await self.db_pool.simple_select_many_batch(
|
|
table="state_group_edges",
|
|
column="prev_state_group",
|
|
iterable=state_groups,
|
|
keyvalues={},
|
|
retcols=("prev_state_group", "state_group"),
|
|
desc="get_previous_state_groups",
|
|
)
|
|
|
|
return {row["state_group"]: row["prev_state_group"] for row in rows}
|
|
|
|
async def purge_room_state(self, room_id, state_groups_to_delete):
|
|
"""Deletes all record of a room from state tables
|
|
|
|
Args:
|
|
room_id (str):
|
|
state_groups_to_delete (list[int]): State groups to delete
|
|
"""
|
|
|
|
await self.db_pool.runInteraction(
|
|
"purge_room_state",
|
|
self._purge_room_state_txn,
|
|
room_id,
|
|
state_groups_to_delete,
|
|
)
|
|
|
|
def _purge_room_state_txn(self, txn, room_id, state_groups_to_delete):
|
|
# first we have to delete the state groups states
|
|
logger.info("[purge] removing %s from state_groups_state", room_id)
|
|
|
|
self.db_pool.simple_delete_many_txn(
|
|
txn,
|
|
table="state_groups_state",
|
|
column="state_group",
|
|
iterable=state_groups_to_delete,
|
|
keyvalues={},
|
|
)
|
|
|
|
# ... and the state group edges
|
|
logger.info("[purge] removing %s from state_group_edges", room_id)
|
|
|
|
self.db_pool.simple_delete_many_txn(
|
|
txn,
|
|
table="state_group_edges",
|
|
column="state_group",
|
|
iterable=state_groups_to_delete,
|
|
keyvalues={},
|
|
)
|
|
|
|
# ... and the state groups
|
|
logger.info("[purge] removing %s from state_groups", room_id)
|
|
|
|
self.db_pool.simple_delete_many_txn(
|
|
txn,
|
|
table="state_groups",
|
|
column="id",
|
|
iterable=state_groups_to_delete,
|
|
keyvalues={},
|
|
)
|