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factor _get_new_state_after_events out of _calculate_state_delta 

This reduces the scope of a bunch of variables
pull/2841/head
Richard van der Hoff 2018-01-19 17:43:40 +00:00
parent 78e7e05188
commit e1e4ec9f9d
1 changed files with 39 additions and 18 deletions
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57
synapse/storage/events.py
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@ -386,11 +386,18 @@ class EventsStore(SQLBaseStore):
if all_single_prev_not_state:
continue
state = yield self._calculate_state_delta(
room_id, ev_ctx_rm, new_latest_event_ids
logger.info(
"Calculating state delta for room %s", room_id,
)
if state:
current_state_for_room[room_id] = state
current_state = yield self._get_new_state_after_events(
ev_ctx_rm, new_latest_event_ids,
)
if current_state is not None:
delta = yield self._calculate_state_delta(
room_id, current_state,
)
if delta is not None:
current_state_for_room[room_id] = delta
yield self.runInteraction(
"persist_events",
@ -467,20 +474,22 @@ class EventsStore(SQLBaseStore):
defer.returnValue(new_latest_event_ids)
@defer.inlineCallbacks
def _calculate_state_delta(self, room_id, events_context, new_latest_event_ids):
"""Calculate the new state deltas for a room.
def _get_new_state_after_events(self, events_context, new_latest_event_ids):
"""Calculate the current state dict after adding some new events to
a room
Assumes that we are only persisting events for one room at a time.
Args:
events_context (list[(EventBase, EventContext)]):
events and contexts which are being added to the room
new_latest_event_ids (iterable[str]):
the new forward extremities for the room.
Returns:
3-tuple (to_delete, to_insert, new_state) where both are state dicts,
i.e. (type, state_key) -> event_id. `to_delete` are the entries to
first be deleted from current_state_events, `to_insert` are entries
to insert. `new_state` is the full set of state.
May return None if there are no changes to be applied.
Deferred[dict[(str,str), str]|None]:
None if there are no changes to the room state, or
a dict of (type, state_key) -> event_id].
"""
# Now we need to work out the different state sets for
# each state extremities
state_sets = []
state_groups = set()
missing_event_ids = []
@ -523,12 +532,12 @@ class EventsStore(SQLBaseStore):
state_sets.extend(group_to_state.itervalues())
if not new_latest_event_ids:
current_state = {}
defer.returnValue({})
elif was_updated:
if len(state_sets) == 1:
# If there is only one state set, then we know what the current
# state is.
current_state = state_sets[0]
defer.returnValue(state_sets[0])
else:
# We work out the current state by passing the state sets to the
# state resolution algorithm. It may ask for some events, including
@ -537,8 +546,7 @@ class EventsStore(SQLBaseStore):
# up in the db.
logger.info(
"Resolving state for %s with %i state sets",
room_id, len(state_sets),
"Resolving state with %i state sets", len(state_sets),
)
events_map = {ev.event_id: ev for ev, _ in events_context}
@ -567,9 +575,22 @@ class EventsStore(SQLBaseStore):
state_sets,
state_map_factory=get_events,
)
defer.returnValue(current_state)
else:
return
@defer.inlineCallbacks
def _calculate_state_delta(self, room_id, current_state):
"""Calculate the new state deltas for a room.
Assumes that we are only persisting events for one room at a time.
Returns:
3-tuple (to_delete, to_insert, new_state) where both are state dicts,
i.e. (type, state_key) -> event_id. `to_delete` are the entries to
first be deleted from current_state_events, `to_insert` are entries
to insert. `new_state` is the full set of state.
"""
existing_state = yield self.get_current_state_ids(room_id)
existing_events = set(existing_state.itervalues())