forked-synapse/synapse/storage/state.py

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# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
# 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.
from ._base import SQLBaseStore
from synapse.util.caches.descriptors import (
cached, cachedInlineCallbacks, cachedList
)
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from twisted.internet import defer
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import logging
logger = logging.getLogger(__name__)
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class StateStore(SQLBaseStore):
""" Keeps track of the state at a given event.
This is done by the concept of `state groups`. Every event is a assigned
a state group (identified by an arbitrary string), which references a
collection of state events. The current state of an event is then the
collection of state events referenced by the event's state group.
Hence, every change in the current state causes a new state group to be
generated. However, if no change happens (e.g., if we get a message event
with only one parent it inherits the state group from its parent.)
There are three tables:
* `state_groups`: Stores group name, first event with in the group and
room id.
* `event_to_state_groups`: Maps events to state groups.
* `state_groups_state`: Maps state group to state events.
"""
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@defer.inlineCallbacks
def get_state_groups(self, room_id, event_ids):
""" Get the state groups for the given list of event_ids
The return value is a dict mapping group names to lists of events.
"""
if not event_ids:
defer.returnValue({})
event_to_groups = yield self._get_state_group_for_events(
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event_ids,
)
groups = set(event_to_groups.values())
group_to_state = yield self._get_state_for_groups(groups)
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defer.returnValue({
group: state_map.values()
for group, state_map in group_to_state.items()
})
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def _store_state_groups_txn(self, txn, event, context):
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return self._store_mult_state_groups_txn(txn, [(event, context)])
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def _store_mult_state_groups_txn(self, txn, events_and_contexts):
state_groups = {}
for event, context in events_and_contexts:
if context.current_state is None:
continue
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if context.state_group is not None:
state_groups[event.event_id] = context.state_group
continue
state_events = dict(context.current_state)
if event.is_state():
state_events[(event.type, event.state_key)] = event
state_group = self._state_groups_id_gen.get_next()
self._simple_insert_txn(
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txn,
table="state_groups",
values={
"id": state_group,
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"room_id": event.room_id,
"event_id": event.event_id,
},
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)
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self._simple_insert_many_txn(
txn,
table="state_groups_state",
values=[
{
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"state_group": state_group,
"room_id": state.room_id,
"type": state.type,
"state_key": state.state_key,
"event_id": state.event_id,
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}
for state in state_events.values()
],
)
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state_groups[event.event_id] = state_group
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self._simple_insert_many_txn(
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txn,
table="event_to_state_groups",
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values=[
{
"state_group": state_groups[event.event_id],
"event_id": event.event_id,
}
for event, context in events_and_contexts
if context.current_state is not None
],
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)
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@defer.inlineCallbacks
def get_current_state(self, room_id, event_type=None, state_key=""):
if event_type and state_key is not None:
result = yield self.get_current_state_for_key(
room_id, event_type, state_key
)
defer.returnValue(result)
def f(txn):
sql = (
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"SELECT event_id FROM current_state_events"
" WHERE room_id = ? "
)
if event_type and state_key is not None:
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sql += " AND type = ? AND state_key = ? "
args = (room_id, event_type, state_key)
elif event_type:
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sql += " AND type = ?"
args = (room_id, event_type)
else:
args = (room_id, )
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txn.execute(sql, args)
results = txn.fetchall()
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return [r[0] for r in results]
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event_ids = yield self.runInteraction("get_current_state", f)
events = yield self._get_events(event_ids, get_prev_content=False)
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defer.returnValue(events)
@cachedInlineCallbacks(num_args=3)
def get_current_state_for_key(self, room_id, event_type, state_key):
def f(txn):
sql = (
"SELECT event_id FROM current_state_events"
" WHERE room_id = ? AND type = ? AND state_key = ?"
)
args = (room_id, event_type, state_key)
txn.execute(sql, args)
results = txn.fetchall()
return [r[0] for r in results]
event_ids = yield self.runInteraction("get_current_state_for_key", f)
events = yield self._get_events(event_ids, get_prev_content=False)
defer.returnValue(events)
def _get_state_groups_from_groups(self, groups, types):
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"""Returns dictionary state_group -> state event ids
"""
def f(txn, groups):
if types is not None:
where_clause = "AND (%s)" % (
" OR ".join(["(type = ? AND state_key = ?)"] * len(types)),
)
else:
where_clause = ""
sql = (
"SELECT state_group, event_id FROM state_groups_state WHERE"
" state_group IN (%s) %s" % (
",".join("?" for _ in groups),
where_clause,
)
)
args = list(groups)
if types is not None:
args.extend([i for typ in types for i in typ])
txn.execute(sql, args)
rows = self.cursor_to_dict(txn)
results = {}
for row in rows:
results.setdefault(row["state_group"], []).append(row["event_id"])
return results
chunks = [groups[i:i + 100] for i in xrange(0, len(groups), 100)]
for chunk in chunks:
return self.runInteraction(
"_get_state_groups_from_groups",
f, chunk
)
@defer.inlineCallbacks
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def get_state_for_events(self, event_ids, types):
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"""Given a list of event_ids and type tuples, return a list of state
dicts for each event. The state dicts will only have the type/state_keys
that are in the `types` list.
Args:
event_ids (list)
types (list): List of (type, state_key) tuples which are used to
filter the state fetched. `state_key` may be None, which matches
any `state_key`
Returns:
deferred: A list of dicts corresponding to the event_ids given.
The dicts are mappings from (type, state_key) -> state_events
"""
event_to_groups = yield self._get_state_group_for_events(
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event_ids,
)
groups = set(event_to_groups.values())
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group_to_state = yield self._get_state_for_groups(groups, types)
event_to_state = {
event_id: group_to_state[group]
for event_id, group in event_to_groups.items()
}
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defer.returnValue({event: event_to_state[event] for event in event_ids})
@defer.inlineCallbacks
def get_state_for_event(self, event_id, types=None):
"""
Get the state dict corresponding to a particular event
:param str event_id: event whose state should be returned
:param list[(str, str)]|None types: List of (type, state_key) tuples
which are used to filter the state fetched. May be None, which
matches any key
:return: a deferred dict from (type, state_key) -> state_event
"""
state_map = yield self.get_state_for_events([event_id], types)
defer.returnValue(state_map[event_id])
@cached(num_args=2, lru=True, max_entries=10000)
def _get_state_group_for_event(self, room_id, event_id):
return self._simple_select_one_onecol(
table="event_to_state_groups",
keyvalues={
"event_id": event_id,
},
retcol="state_group",
allow_none=True,
desc="_get_state_group_for_event",
)
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@cachedList(cache=_get_state_group_for_event.cache, list_name="event_ids",
num_args=1, inlineCallbacks=True)
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def _get_state_group_for_events(self, event_ids):
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"""Returns mapping event_id -> state_group
"""
rows = yield self._simple_select_many_batch(
table="event_to_state_groups",
column="event_id",
iterable=event_ids,
keyvalues={},
retcols=("event_id", "state_group",),
desc="_get_state_group_for_events",
)
defer.returnValue({row["event_id"]: row["state_group"] for row in rows})
def _get_some_state_from_cache(self, group, types):
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"""Checks if group is in cache. See `_get_state_for_groups`
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Returns 3-tuple (`state_dict`, `missing_types`, `got_all`).
`missing_types` is the list of types that aren't in the cache for that
group. `got_all` is a bool indicating if we successfully retrieved all
requests state from the cache, if False we need to query the DB for the
missing state.
Args:
group: The state group to lookup
types (list): List of 2-tuples of the form (`type`, `state_key`),
where a `state_key` of `None` matches all state_keys for the
`type`.
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"""
is_all, state_dict = self._state_group_cache.get(group)
type_to_key = {}
missing_types = set()
for typ, state_key in types:
if state_key is None:
type_to_key[typ] = None
missing_types.add((typ, state_key))
else:
if type_to_key.get(typ, object()) is not None:
type_to_key.setdefault(typ, set()).add(state_key)
if (typ, state_key) not in state_dict:
missing_types.add((typ, state_key))
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sentinel = object()
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def include(typ, state_key):
valid_state_keys = type_to_key.get(typ, sentinel)
if valid_state_keys is sentinel:
return False
if valid_state_keys is None:
return True
if state_key in valid_state_keys:
return True
return False
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got_all = not (missing_types or types is None)
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return {
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k: v for k, v in state_dict.items()
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if include(k[0], k[1])
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}, missing_types, got_all
def _get_all_state_from_cache(self, group):
"""Checks if group is in cache. See `_get_state_for_groups`
Returns 2-tuple (`state_dict`, `got_all`). `got_all` is a bool
indicating if we successfully retrieved all requests state from the
cache, if False we need to query the DB for the missing state.
Args:
group: The state group to lookup
"""
is_all, state_dict = self._state_group_cache.get(group)
return state_dict, is_all
@defer.inlineCallbacks
def _get_state_for_groups(self, groups, types=None):
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"""Given list of groups returns dict of group -> list of state events
with matching types. `types` is a list of `(type, state_key)`, where
a `state_key` of None matches all state_keys. If `types` is None then
all events are returned.
"""
results = {}
missing_groups = []
if types is not None:
for group in set(groups):
state_dict, missing_types, got_all = self._get_some_state_from_cache(
group, types
)
results[group] = state_dict
if not got_all:
missing_groups.append(group)
else:
for group in set(groups):
state_dict, got_all = self._get_all_state_from_cache(
group
)
results[group] = state_dict
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if not got_all:
missing_groups.append(group)
if not missing_groups:
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defer.returnValue({
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group: {
type_tuple: event
for type_tuple, event in state.items()
if event
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}
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for group, state in results.items()
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})
# Okay, so we have some missing_types, lets fetch them.
cache_seq_num = self._state_group_cache.sequence
group_state_dict = yield self._get_state_groups_from_groups(
missing_groups, types
)
state_events = yield self._get_events(
[e_id for l in group_state_dict.values() for e_id in l],
get_prev_content=False
)
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state_events = {e.event_id: e for e in state_events}
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# Now we want to update the cache with all the things we fetched
# from the database.
for group, state_ids in group_state_dict.items():
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if types:
# We delibrately put key -> None mappings into the cache to
# cache absence of the key, on the assumption that if we've
# explicitly asked for some types then we will probably ask
# for them again.
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state_dict = {key: None for key in types}
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state_dict.update(results[group])
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results[group] = state_dict
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else:
state_dict = results[group]
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for event_id in state_ids:
try:
state_event = state_events[event_id]
state_dict[(state_event.type, state_event.state_key)] = state_event
except KeyError:
# Hmm. So we do don't have that state event? Interesting.
logger.warn(
"Can't find state event %r for state group %r",
event_id, group,
)
self._state_group_cache.update(
cache_seq_num,
key=group,
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value=state_dict,
full=(types is None),
)
# Remove all the entries with None values. The None values were just
# used for bookkeeping in the cache.
for group, state_dict in results.items():
results[group] = {
key: event for key, event in state_dict.items() if event
}
defer.returnValue(results)