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