Store state groups separately from events (#2784)

* Split state group persist into seperate storage func

* Add per database engine code for state group id gen

* Move store_state_group to StateReadStore

This allows other workers to use it, and so resolve state.

* Hook up store_state_group

* Fix tests

* Rename _store_mult_state_groups_txn

* Rename StateGroupReadStore

* Remove redundant _have_persisted_state_group_txn

* Update comments

* Comment compute_event_context

* Set start val for state_group_id_seq

... otherwise we try to recreate old state groups

* Update comments

* Don't store state for outliers

* Update comment

* Update docstring as state groups are ints
This commit is contained in:
Erik Johnston 2018-02-06 14:31:24 +00:00 committed by GitHub
parent b31bf0bb51
commit 3d33eef6fc
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12 changed files with 341 additions and 204 deletions

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@ -183,8 +183,15 @@ class StateHandler(object):
def compute_event_context(self, event, old_state=None):
"""Build an EventContext structure for the event.
This works out what the current state should be for the event, and
generates a new state group if necessary.
Args:
event (synapse.events.EventBase):
old_state (dict|None): The state at the event if it can't be
calculated from existing events. This is normally only specified
when receiving an event from federation where we don't have the
prev events for, e.g. when backfilling.
Returns:
synapse.events.snapshot.EventContext:
"""
@ -208,15 +215,22 @@ class StateHandler(object):
context.current_state_ids = {}
context.prev_state_ids = {}
context.prev_state_events = []
context.state_group = self.store.get_next_state_group()
# We don't store state for outliers, so we don't generate a state
# froup for it.
context.state_group = None
defer.returnValue(context)
if old_state:
# We already have the state, so we don't need to calculate it.
# Let's just correctly fill out the context and create a
# new state group for it.
context = EventContext()
context.prev_state_ids = {
(s.type, s.state_key): s.event_id for s in old_state
}
context.state_group = self.store.get_next_state_group()
if event.is_state():
key = (event.type, event.state_key)
@ -229,6 +243,14 @@ class StateHandler(object):
else:
context.current_state_ids = context.prev_state_ids
context.state_group = yield self.store.store_state_group(
event.event_id,
event.room_id,
prev_group=None,
delta_ids=None,
current_state_ids=context.current_state_ids,
)
context.prev_state_events = []
defer.returnValue(context)
@ -242,7 +264,8 @@ class StateHandler(object):
context = EventContext()
context.prev_state_ids = curr_state
if event.is_state():
context.state_group = self.store.get_next_state_group()
# If this is a state event then we need to create a new state
# group for the state after this event.
key = (event.type, event.state_key)
if key in context.prev_state_ids:
@ -253,24 +276,43 @@ class StateHandler(object):
context.current_state_ids[key] = event.event_id
if entry.state_group:
# If the state at the event has a state group assigned then
# we can use that as the prev group
context.prev_group = entry.state_group
context.delta_ids = {
key: event.event_id
}
elif entry.prev_group:
# If the state at the event only has a prev group, then we can
# use that as a prev group too.
context.prev_group = entry.prev_group
context.delta_ids = dict(entry.delta_ids)
context.delta_ids[key] = event.event_id
else:
if entry.state_group is None:
entry.state_group = self.store.get_next_state_group()
entry.state_id = entry.state_group
context.state_group = entry.state_group
context.state_group = yield self.store.store_state_group(
event.event_id,
event.room_id,
prev_group=context.prev_group,
delta_ids=context.delta_ids,
current_state_ids=context.current_state_ids,
)
else:
context.current_state_ids = context.prev_state_ids
context.prev_group = entry.prev_group
context.delta_ids = entry.delta_ids
if entry.state_group is None:
entry.state_group = yield self.store.store_state_group(
event.event_id,
event.room_id,
prev_group=entry.prev_group,
delta_ids=entry.delta_ids,
current_state_ids=context.current_state_ids,
)
entry.state_id = entry.state_group
context.state_group = entry.state_group
context.prev_state_events = []
defer.returnValue(context)