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Tidy purge code and add some comments

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Try to make this clearer with more comments and some variable renames
This commit is contained in:
Richard van der Hoff 2017-05-11 10:56:12 +01:00
parent 8e345ce465
commit dc026bb16f
1 changed files with 19 additions and 12 deletions
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31
synapse/storage/events.py
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@ -2080,14 +2080,19 @@ class EventsStore(SQLBaseStore):
)
state_rows = txn.fetchall()
# make a set of the redundant state groups, so that we can look them up
# efficiently
state_groups_to_delete = set([sg for sg, in state_rows])
# Now we get all the state groups that rely on these state groups
logger.debug("[purge] finding state groups which depend on redundant"
" state groups")
new_state_edges = []
remaining_state_groups = []
for i in xrange(0, len(state_rows), 100):
chunk = [sg for sg, in state_rows[i:i + 100]]
# look for state groups whose prev_state_group is one we are about
# to delete
rows = self._simple_select_many_txn(
txn,
table="state_group_edges",
@ -2096,26 +2101,28 @@ class EventsStore(SQLBaseStore):
retcols=["state_group"],
keyvalues={},
)
new_state_edges.extend(
remaining_state_groups.extend(
row["state_group"] for row in rows
# exclude state groups we are about to delete: no point in
# updating them
if row["state_group"] not in state_groups_to_delete
)
# Now we turn the state groups that reference to-be-deleted state groups
# to non delta versions.
for new_state_edge in new_state_edges:
logger.debug("[purge] de-delta-ing remaining state group %s",
new_state_edge)
# Now we turn the state groups that reference to-be-deleted state
# groups to non delta versions.
for sg in remaining_state_groups:
logger.debug("[purge] de-delta-ing remaining state group %s", sg)
curr_state = self._get_state_groups_from_groups_txn(
txn, [new_state_edge], types=None
txn, [sg], types=None
)
curr_state = curr_state[new_state_edge]
curr_state = curr_state[sg]
self._simple_delete_txn(
txn,
table="state_groups_state",
keyvalues={
"state_group": new_state_edge,
"state_group": sg,
}
)
@ -2123,7 +2130,7 @@ class EventsStore(SQLBaseStore):
txn,
table="state_group_edges",
keyvalues={
"state_group": new_state_edge,
"state_group": sg,
}
)
@ -2132,7 +2139,7 @@ class EventsStore(SQLBaseStore):
table="state_groups_state",
values=[
{
"state_group": new_state_edge,
"state_group": sg,
"room_id": room_id,
"type": key[0],
"state_key": key[1],