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Clarify docstrings in storage.stats

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Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>
This commit is contained in:
Olivier Wilkinson (reivilibre) 2019-08-14 08:19:19 +01:00
parent de6b266817
commit f9f551fb93
1 changed files with 18 additions and 12 deletions
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30
synapse/storage/stats.py
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@ -86,8 +86,10 @@ class StatsStore(StateDeltasStore):
ts: the timestamp to quantise, in seconds since the Unix Epoch
Returns:
a timestamp which is divisible by the bucket size,
is no later than `ts` and is the largest such timestamp.
a timestamp which
- is divisible by the bucket size;
- is no later than `ts`; and
- is the largest such timestamp.
"""
return (ts // self.stats_bucket_size) * self.stats_bucket_size
@ -546,14 +548,23 @@ class StatsStore(StateDeltasStore):
def update_total_event_count_between_txn(self, txn, low_pos, high_pos):
"""
Updates the total_events counts for rooms
Updates the total_events counts for rooms, in a range of stream_orderings.
Inclusivity of low_pos and high_pos is dependent upon their signs.
This makes it intuitive to use this function for both backfilled
and non-backfilled events.
Examples:
(low, high) → (kind)
(3, 7) → 3 < … <= 7 (normal-filled; low already processed before)
(-4, -2) → -4 <= … < -2 (backfilled; high already processed before)
(-7, 7) → -7 <= … <= 7 (both)
Args:
txn: Database transaction. It is assumed that you will have one,
since you probably want to update pointers at the same time.
low_pos: The old stream position (stream position of the last event
that was already handled.)
high_pos: The new stream position (stream position of the new last
event to handle.)
low_pos: Low stream ordering
high_pos: High stream ordering
"""
if low_pos >= high_pos:
@ -566,11 +577,6 @@ class StatsStore(StateDeltasStore):
low_comparator = "<=" if low_pos < 0 else "<"
high_comparator = "<" if high_pos < 0 else "<="
# so, examples:
# 3, 7 → 3 < … <= 7 (normal-filled)
# -4, -2 → -4 <= … < -2 (backfilled)
# -7, 7 → -7 <= … <= 7 (both)
sql = """
SELECT room_id, COUNT(*) AS new_events
FROM events