diff options
Diffstat (limited to 'synapse')
| -rw-r--r-- | synapse/storage/state.py | 56 | ||||
| -rw-r--r-- | synapse/util/caches/dictionary_cache.py | 25 |
2 files changed, 55 insertions, 26 deletions
diff --git a/synapse/storage/state.py b/synapse/storage/state.py index 986a20400c..cd9821c270 100644 --- a/synapse/storage/state.py +++ b/synapse/storage/state.py @@ -526,10 +526,23 @@ class StateGroupWorkerStore(SQLBaseStore): @defer.inlineCallbacks def _get_state_for_groups(self, groups, types=None): - """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. + """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. + types (None|iterable[(str, None|str)]): + indicates the state type/keys required. If None, the whole + state is fetched and returned. + + Otherwise, each entry should be a `(type, state_key)` tuple to + include in the response. A `state_key` of None is a wildcard + meaning that we require all state with that type. + + Returns: + Deferred[dict[int, dict[(type, state_key), EventBase]]] + a dictionary mapping from state group to state dictionary. """ if types: types = frozenset(types) @@ -538,7 +551,7 @@ class StateGroupWorkerStore(SQLBaseStore): if types is not None: for group in set(groups): state_dict_ids, _, got_all = self._get_some_state_from_cache( - group, types + group, types, ) results[group] = state_dict_ids @@ -559,22 +572,40 @@ class StateGroupWorkerStore(SQLBaseStore): # Okay, so we have some missing_types, lets fetch them. cache_seq_num = self._state_group_cache.sequence + # 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. + + if types and any(k is None for (t, k) in types): + types_to_fetch = None + else: + types_to_fetch = types + group_to_state_dict = yield self._get_state_groups_from_groups( - missing_groups, types + missing_groups, types_to_fetch, ) - # Now we want to update the cache with all the things we fetched - # from the database. for group, group_state_dict in iteritems(group_to_state_dict): state_dict = results[group] - state_dict.update(group_state_dict) + # update the result, filtering by `types`. + if types: + for k, v in iteritems(group_state_dict): + (typ, _) = k + if k in types or (typ, None) in types: + state_dict[k] = v + else: + state_dict.update(group_state_dict) + + # update the cache with all the things we fetched from the + # database. self._state_group_cache.update( cache_seq_num, key=group, - value=state_dict, - full=(types is None), - known_absent=types, + value=group_state_dict, + fetched_keys=types_to_fetch, ) defer.returnValue(results) @@ -681,7 +712,6 @@ class StateGroupWorkerStore(SQLBaseStore): self._state_group_cache.sequence, key=state_group, value=dict(current_state_ids), - full=True, ) return state_group diff --git a/synapse/util/caches/dictionary_cache.py b/synapse/util/caches/dictionary_cache.py index bdc21e348f..95793d466d 100644 --- a/synapse/util/caches/dictionary_cache.py +++ b/synapse/util/caches/dictionary_cache.py @@ -107,29 +107,28 @@ class DictionaryCache(object): self.sequence += 1 self.cache.clear() - def update(self, sequence, key, value, full=False, known_absent=None): + def update(self, sequence, key, value, fetched_keys=None): """Updates the entry in the cache Args: sequence - key - value (dict): The value to update the cache with. - full (bool): Whether the given value is the full dict, or just a - partial subset there of. If not full then any existing entries - for the key will be updated. - known_absent (set): Set of keys that we know don't exist in the full - dict. + key (K) + value (dict[X,Y]): The value to update the cache with. + fetched_keys (None|set[X]): All of the dictionary keys which were + fetched from the database. + + If None, this is the complete value for key K. Otherwise, it + is used to infer a list of keys which we know don't exist in + the full dict. """ self.check_thread() if self.sequence == sequence: # Only update the cache if the caches sequence number matches the # number that the cache had before the SELECT was started (SYN-369) - if known_absent is None: - known_absent = set() - if full: - self._insert(key, value, known_absent) + if fetched_keys is None: + self._insert(key, value, set()) else: - self._update_or_insert(key, value, known_absent) + self._update_or_insert(key, value, fetched_keys) def _update_or_insert(self, key, value, known_absent): # We pop and reinsert as we need to tell the cache the size may have |