558 lines
19 KiB
Python
558 lines
19 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014-2016 OpenMarket Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
import logging
|
|
|
|
from six import iteritems, itervalues
|
|
|
|
import attr
|
|
|
|
from twisted.internet import defer
|
|
|
|
from synapse.api.constants import EventTypes
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
@attr.s(slots=True)
|
|
class StateFilter(object):
|
|
"""A filter used when querying for state.
|
|
|
|
Attributes:
|
|
types (dict[str, set[str]|None]): Map from type to set of state keys (or
|
|
None). This specifies which state_keys for the given type to fetch
|
|
from the DB. If None then all events with that type are fetched. If
|
|
the set is empty then no events with that type are fetched.
|
|
include_others (bool): Whether to fetch events with types that do not
|
|
appear in `types`.
|
|
"""
|
|
|
|
types = attr.ib()
|
|
include_others = attr.ib(default=False)
|
|
|
|
def __attrs_post_init__(self):
|
|
# If `include_others` is set we canonicalise the filter by removing
|
|
# wildcards from the types dictionary
|
|
if self.include_others:
|
|
self.types = {k: v for k, v in iteritems(self.types) if v is not None}
|
|
|
|
@staticmethod
|
|
def all():
|
|
"""Creates a filter that fetches everything.
|
|
|
|
Returns:
|
|
StateFilter
|
|
"""
|
|
return StateFilter(types={}, include_others=True)
|
|
|
|
@staticmethod
|
|
def none():
|
|
"""Creates a filter that fetches nothing.
|
|
|
|
Returns:
|
|
StateFilter
|
|
"""
|
|
return StateFilter(types={}, include_others=False)
|
|
|
|
@staticmethod
|
|
def from_types(types):
|
|
"""Creates a filter that only fetches the given types
|
|
|
|
Args:
|
|
types (Iterable[tuple[str, str|None]]): A list of type and state
|
|
keys to fetch. A state_key of None fetches everything for
|
|
that type
|
|
|
|
Returns:
|
|
StateFilter
|
|
"""
|
|
type_dict = {}
|
|
for typ, s in types:
|
|
if typ in type_dict:
|
|
if type_dict[typ] is None:
|
|
continue
|
|
|
|
if s is None:
|
|
type_dict[typ] = None
|
|
continue
|
|
|
|
type_dict.setdefault(typ, set()).add(s)
|
|
|
|
return StateFilter(types=type_dict)
|
|
|
|
@staticmethod
|
|
def from_lazy_load_member_list(members):
|
|
"""Creates a filter that returns all non-member events, plus the member
|
|
events for the given users
|
|
|
|
Args:
|
|
members (iterable[str]): Set of user IDs
|
|
|
|
Returns:
|
|
StateFilter
|
|
"""
|
|
return StateFilter(types={EventTypes.Member: set(members)}, include_others=True)
|
|
|
|
def return_expanded(self):
|
|
"""Creates a new StateFilter where type wild cards have been removed
|
|
(except for memberships). The returned filter is a superset of the
|
|
current one, i.e. anything that passes the current filter will pass
|
|
the returned filter.
|
|
|
|
This helps the caching as the DictionaryCache knows if it has *all* the
|
|
state, but does not know if it has all of the keys of a particular type,
|
|
which makes wildcard lookups expensive unless we have a complete cache.
|
|
Hence, if we are doing a wildcard lookup, populate the cache fully so
|
|
that we can do an efficient lookup next time.
|
|
|
|
Note that since we have two caches, one for membership events and one for
|
|
other events, we can be a bit more clever than simply returning
|
|
`StateFilter.all()` if `has_wildcards()` is True.
|
|
|
|
We return a StateFilter where:
|
|
1. the list of membership events to return is the same
|
|
2. if there is a wildcard that matches non-member events we
|
|
return all non-member events
|
|
|
|
Returns:
|
|
StateFilter
|
|
"""
|
|
|
|
if self.is_full():
|
|
# If we're going to return everything then there's nothing to do
|
|
return self
|
|
|
|
if not self.has_wildcards():
|
|
# If there are no wild cards, there's nothing to do
|
|
return self
|
|
|
|
if EventTypes.Member in self.types:
|
|
get_all_members = self.types[EventTypes.Member] is None
|
|
else:
|
|
get_all_members = self.include_others
|
|
|
|
has_non_member_wildcard = self.include_others or any(
|
|
state_keys is None
|
|
for t, state_keys in iteritems(self.types)
|
|
if t != EventTypes.Member
|
|
)
|
|
|
|
if not has_non_member_wildcard:
|
|
# If there are no non-member wild cards we can just return ourselves
|
|
return self
|
|
|
|
if get_all_members:
|
|
# We want to return everything.
|
|
return StateFilter.all()
|
|
else:
|
|
# We want to return all non-members, but only particular
|
|
# memberships
|
|
return StateFilter(
|
|
types={EventTypes.Member: self.types[EventTypes.Member]},
|
|
include_others=True,
|
|
)
|
|
|
|
def make_sql_filter_clause(self):
|
|
"""Converts the filter to an SQL clause.
|
|
|
|
For example:
|
|
|
|
f = StateFilter.from_types([("m.room.create", "")])
|
|
clause, args = f.make_sql_filter_clause()
|
|
clause == "(type = ? AND state_key = ?)"
|
|
args == ['m.room.create', '']
|
|
|
|
|
|
Returns:
|
|
tuple[str, list]: The SQL string (may be empty) and arguments. An
|
|
empty SQL string is returned when the filter matches everything
|
|
(i.e. is "full").
|
|
"""
|
|
|
|
where_clause = ""
|
|
where_args = []
|
|
|
|
if self.is_full():
|
|
return where_clause, where_args
|
|
|
|
if not self.include_others and not self.types:
|
|
# i.e. this is an empty filter, so we need to return a clause that
|
|
# will match nothing
|
|
return "1 = 2", []
|
|
|
|
# First we build up a lost of clauses for each type/state_key combo
|
|
clauses = []
|
|
for etype, state_keys in iteritems(self.types):
|
|
if state_keys is None:
|
|
clauses.append("(type = ?)")
|
|
where_args.append(etype)
|
|
continue
|
|
|
|
for state_key in state_keys:
|
|
clauses.append("(type = ? AND state_key = ?)")
|
|
where_args.extend((etype, state_key))
|
|
|
|
# This will match anything that appears in `self.types`
|
|
where_clause = " OR ".join(clauses)
|
|
|
|
# If we want to include stuff that's not in the types dict then we add
|
|
# a `OR type NOT IN (...)` clause to the end.
|
|
if self.include_others:
|
|
if where_clause:
|
|
where_clause += " OR "
|
|
|
|
where_clause += "type NOT IN (%s)" % (",".join(["?"] * len(self.types)),)
|
|
where_args.extend(self.types)
|
|
|
|
return where_clause, where_args
|
|
|
|
def max_entries_returned(self):
|
|
"""Returns the maximum number of entries this filter will return if
|
|
known, otherwise returns None.
|
|
|
|
For example a simple state filter asking for `("m.room.create", "")`
|
|
will return 1, whereas the default state filter will return None.
|
|
|
|
This is used to bail out early if the right number of entries have been
|
|
fetched.
|
|
"""
|
|
if self.has_wildcards():
|
|
return None
|
|
|
|
return len(self.concrete_types())
|
|
|
|
def filter_state(self, state_dict):
|
|
"""Returns the state filtered with by this StateFilter
|
|
|
|
Args:
|
|
state (dict[tuple[str, str], Any]): The state map to filter
|
|
|
|
Returns:
|
|
dict[tuple[str, str], Any]: The filtered state map
|
|
"""
|
|
if self.is_full():
|
|
return dict(state_dict)
|
|
|
|
filtered_state = {}
|
|
for k, v in iteritems(state_dict):
|
|
typ, state_key = k
|
|
if typ in self.types:
|
|
state_keys = self.types[typ]
|
|
if state_keys is None or state_key in state_keys:
|
|
filtered_state[k] = v
|
|
elif self.include_others:
|
|
filtered_state[k] = v
|
|
|
|
return filtered_state
|
|
|
|
def is_full(self):
|
|
"""Whether this filter fetches everything or not
|
|
|
|
Returns:
|
|
bool
|
|
"""
|
|
return self.include_others and not self.types
|
|
|
|
def has_wildcards(self):
|
|
"""Whether the filter includes wildcards or is attempting to fetch
|
|
specific state.
|
|
|
|
Returns:
|
|
bool
|
|
"""
|
|
|
|
return self.include_others or any(
|
|
state_keys is None for state_keys in itervalues(self.types)
|
|
)
|
|
|
|
def concrete_types(self):
|
|
"""Returns a list of concrete type/state_keys (i.e. not None) that
|
|
will be fetched. This will be a complete list if `has_wildcards`
|
|
returns False, but otherwise will be a subset (or even empty).
|
|
|
|
Returns:
|
|
list[tuple[str,str]]
|
|
"""
|
|
return [
|
|
(t, s)
|
|
for t, state_keys in iteritems(self.types)
|
|
if state_keys is not None
|
|
for s in state_keys
|
|
]
|
|
|
|
def get_member_split(self):
|
|
"""Return the filter split into two: one which assumes it's exclusively
|
|
matching against member state, and one which assumes it's matching
|
|
against non member state.
|
|
|
|
This is useful due to the returned filters giving correct results for
|
|
`is_full()`, `has_wildcards()`, etc, when operating against maps that
|
|
either exclusively contain member events or only contain non-member
|
|
events. (Which is the case when dealing with the member vs non-member
|
|
state caches).
|
|
|
|
Returns:
|
|
tuple[StateFilter, StateFilter]: The member and non member filters
|
|
"""
|
|
|
|
if EventTypes.Member in self.types:
|
|
state_keys = self.types[EventTypes.Member]
|
|
if state_keys is None:
|
|
member_filter = StateFilter.all()
|
|
else:
|
|
member_filter = StateFilter({EventTypes.Member: state_keys})
|
|
elif self.include_others:
|
|
member_filter = StateFilter.all()
|
|
else:
|
|
member_filter = StateFilter.none()
|
|
|
|
non_member_filter = StateFilter(
|
|
types={k: v for k, v in iteritems(self.types) if k != EventTypes.Member},
|
|
include_others=self.include_others,
|
|
)
|
|
|
|
return member_filter, non_member_filter
|
|
|
|
|
|
class StateGroupStorage(object):
|
|
"""High level interface to fetching state for event.
|
|
"""
|
|
|
|
def __init__(self, hs, stores):
|
|
self.stores = stores
|
|
|
|
def get_state_group_delta(self, state_group):
|
|
"""Given a state group try to return a previous group and a delta between
|
|
the old and the new.
|
|
|
|
Returns:
|
|
Deferred[Tuple[Optional[int], Optional[list[dict[tuple[str, str], str]]]]]):
|
|
(prev_group, delta_ids)
|
|
"""
|
|
|
|
return self.stores.state.get_state_group_delta(state_group)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_groups_ids(self, _room_id, event_ids):
|
|
"""Get the event IDs of all the state for the state groups for the given events
|
|
|
|
Args:
|
|
_room_id (str): id of the room for these events
|
|
event_ids (iterable[str]): ids of the events
|
|
|
|
Returns:
|
|
Deferred[dict[int, dict[tuple[str, str], str]]]:
|
|
dict of state_group_id -> (dict of (type, state_key) -> event id)
|
|
"""
|
|
if not event_ids:
|
|
return {}
|
|
|
|
event_to_groups = yield self.stores.main._get_state_group_for_events(event_ids)
|
|
|
|
groups = set(itervalues(event_to_groups))
|
|
group_to_state = yield self.stores.state._get_state_for_groups(groups)
|
|
|
|
return group_to_state
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_ids_for_group(self, state_group):
|
|
"""Get the event IDs of all the state in the given state group
|
|
|
|
Args:
|
|
state_group (int)
|
|
|
|
Returns:
|
|
Deferred[dict]: Resolves to a map of (type, state_key) -> event_id
|
|
"""
|
|
group_to_state = yield self._get_state_for_groups((state_group,))
|
|
|
|
return group_to_state[state_group]
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_groups(self, room_id, event_ids):
|
|
""" Get the state groups for the given list of event_ids
|
|
Returns:
|
|
Deferred[dict[int, list[EventBase]]]:
|
|
dict of state_group_id -> list of state events.
|
|
"""
|
|
if not event_ids:
|
|
return {}
|
|
|
|
group_to_ids = yield self.get_state_groups_ids(room_id, event_ids)
|
|
|
|
state_event_map = yield self.stores.main.get_events(
|
|
[
|
|
ev_id
|
|
for group_ids in itervalues(group_to_ids)
|
|
for ev_id in itervalues(group_ids)
|
|
],
|
|
get_prev_content=False,
|
|
)
|
|
|
|
return {
|
|
group: [
|
|
state_event_map[v]
|
|
for v in itervalues(event_id_map)
|
|
if v in state_event_map
|
|
]
|
|
for group, event_id_map in iteritems(group_to_ids)
|
|
}
|
|
|
|
def _get_state_groups_from_groups(self, groups, state_filter):
|
|
"""Returns the state groups for a given set of groups, filtering on
|
|
types of state events.
|
|
|
|
Args:
|
|
groups(list[int]): list of state group IDs to query
|
|
state_filter (StateFilter): The state filter used to fetch state
|
|
from the database.
|
|
Returns:
|
|
Deferred[dict[int, dict[tuple[str, str], str]]]:
|
|
dict of state_group_id -> (dict of (type, state_key) -> event id)
|
|
"""
|
|
|
|
return self.stores.state._get_state_groups_from_groups(groups, state_filter)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_for_events(self, event_ids, state_filter=StateFilter.all()):
|
|
"""Given a list of event_ids and type tuples, return a list of state
|
|
dicts for each event.
|
|
Args:
|
|
event_ids (list[string])
|
|
state_filter (StateFilter): The state filter used to fetch state
|
|
from the database.
|
|
Returns:
|
|
deferred: A dict of (event_id) -> (type, state_key) -> [state_events]
|
|
"""
|
|
event_to_groups = yield self.stores.main._get_state_group_for_events(event_ids)
|
|
|
|
groups = set(itervalues(event_to_groups))
|
|
group_to_state = yield self.stores.state._get_state_for_groups(
|
|
groups, state_filter
|
|
)
|
|
|
|
state_event_map = yield self.stores.main.get_events(
|
|
[ev_id for sd in itervalues(group_to_state) for ev_id in itervalues(sd)],
|
|
get_prev_content=False,
|
|
)
|
|
|
|
event_to_state = {
|
|
event_id: {
|
|
k: state_event_map[v]
|
|
for k, v in iteritems(group_to_state[group])
|
|
if v in state_event_map
|
|
}
|
|
for event_id, group in iteritems(event_to_groups)
|
|
}
|
|
|
|
return {event: event_to_state[event] for event in event_ids}
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_ids_for_events(self, event_ids, state_filter=StateFilter.all()):
|
|
"""
|
|
Get the state dicts corresponding to a list of events, containing the event_ids
|
|
of the state events (as opposed to the events themselves)
|
|
|
|
Args:
|
|
event_ids(list(str)): events whose state should be returned
|
|
state_filter (StateFilter): The state filter used to fetch state
|
|
from the database.
|
|
|
|
Returns:
|
|
A deferred dict from event_id -> (type, state_key) -> event_id
|
|
"""
|
|
event_to_groups = yield self.stores.main._get_state_group_for_events(event_ids)
|
|
|
|
groups = set(itervalues(event_to_groups))
|
|
group_to_state = yield self.stores.state._get_state_for_groups(
|
|
groups, state_filter
|
|
)
|
|
|
|
event_to_state = {
|
|
event_id: group_to_state[group]
|
|
for event_id, group in iteritems(event_to_groups)
|
|
}
|
|
|
|
return {event: event_to_state[event] for event in event_ids}
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_for_event(self, event_id, state_filter=StateFilter.all()):
|
|
"""
|
|
Get the state dict corresponding to a particular event
|
|
|
|
Args:
|
|
event_id(str): event whose state should be returned
|
|
state_filter (StateFilter): The state filter used to fetch state
|
|
from the database.
|
|
|
|
Returns:
|
|
A deferred dict from (type, state_key) -> state_event
|
|
"""
|
|
state_map = yield self.get_state_for_events([event_id], state_filter)
|
|
return state_map[event_id]
|
|
|
|
@defer.inlineCallbacks
|
|
def get_state_ids_for_event(self, event_id, state_filter=StateFilter.all()):
|
|
"""
|
|
Get the state dict corresponding to a particular event
|
|
|
|
Args:
|
|
event_id(str): event whose state should be returned
|
|
state_filter (StateFilter): The state filter used to fetch state
|
|
from the database.
|
|
|
|
Returns:
|
|
A deferred dict from (type, state_key) -> state_event
|
|
"""
|
|
state_map = yield self.get_state_ids_for_events([event_id], state_filter)
|
|
return state_map[event_id]
|
|
|
|
def _get_state_for_groups(self, groups, state_filter=StateFilter.all()):
|
|
"""Gets the state at each of a list of state groups, optionally
|
|
filtering by type/state_key
|
|
|
|
Args:
|
|
groups (iterable[int]): list of state groups for which we want
|
|
to get the state.
|
|
state_filter (StateFilter): The state filter used to fetch state
|
|
from the database.
|
|
Returns:
|
|
Deferred[dict[int, dict[tuple[str, str], str]]]:
|
|
dict of state_group_id -> (dict of (type, state_key) -> event id)
|
|
"""
|
|
return self.stores.state._get_state_for_groups(groups, state_filter)
|
|
|
|
def store_state_group(
|
|
self, event_id, room_id, prev_group, delta_ids, current_state_ids
|
|
):
|
|
"""Store a new set of state, returning a newly assigned state group.
|
|
|
|
Args:
|
|
event_id (str): The event ID for which the state was calculated
|
|
room_id (str)
|
|
prev_group (int|None): A previous state group for the room, optional.
|
|
delta_ids (dict|None): The delta between state at `prev_group` and
|
|
`current_state_ids`, if `prev_group` was given. Same format as
|
|
`current_state_ids`.
|
|
current_state_ids (dict): The state to store. Map of (type, state_key)
|
|
to event_id.
|
|
|
|
Returns:
|
|
Deferred[int]: The state group ID
|
|
"""
|
|
return self.stores.state.store_state_group(
|
|
event_id, room_id, prev_group, delta_ids, current_state_ids
|
|
)
|