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Mark threads as read separately.
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@clokep
clokep committed Sep 27, 2022
1 parent f20620f commit 52b0a3d
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1 change: 1 addition & 0 deletions changelog.d/13877.feature
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Experimental support for thread-specific receipts ([MSC3771](https://github.com/matrix-org/matrix-spec-proposals/pull/3771)).
249 changes: 214 additions & 35 deletions synapse/storage/databases/main/event_push_actions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,7 @@
DatabasePool,
LoggingDatabaseConnection,
LoggingTransaction,
PostgresEngine,
)
from synapse.storage.databases.main.receipts import ReceiptsWorkerStore
from synapse.storage.databases.main.stream import StreamWorkerStore
Expand Down Expand Up @@ -427,8 +428,8 @@ def _get_unread_counts_by_pos_txn(
room_id: The room ID to get unread counts for.
user_id: The user ID to get unread counts for.
receipt_stream_ordering: The stream ordering of the user's latest
receipt in the room. If there are no receipts, the stream ordering
of the user's join event.
unthreaded receipt in the room. If there are no unthreaded receipts,
the stream ordering of the user's join event.
Returns:
A RoomNotifCounts object containing the notification count, the
Expand All @@ -444,6 +445,20 @@ def _get_thread(thread_id: str) -> NotifCounts:
return main_counts
return thread_counts.setdefault(thread_id, NotifCounts())

receipt_types_clause, receipts_args = make_in_list_sql_clause(
self.database_engine,
"receipt_type",
(ReceiptTypes.READ, ReceiptTypes.READ_PRIVATE),
)

# PostgreSQL and SQLite differ in comparing scalar numerics.
if isinstance(self.database_engine, PostgresEngine):
# GREATEST ignores NULLs.
receipt_stream_clause = "GREATEST(receipt_stream_ordering, ?)"
else:
# MAX returns NULL if any are NULL, so COALESCE to 0 first.
receipt_stream_clause = "MAX(COALESCE(receipt_stream_ordering, 0), ?)"

# First we pull the counts from the summary table.
#
# We check that `last_receipt_stream_ordering` matches the stream
Expand All @@ -458,57 +473,151 @@ def _get_thread(thread_id: str) -> NotifCounts:
# updated `event_push_summary` synchronously when persisting a new read
# receipt).
txn.execute(
"""
SELECT stream_ordering, notif_count, COALESCE(unread_count, 0), thread_id
f"""
SELECT notif_count, COALESCE(unread_count, 0), thread_id
FROM event_push_summary
LEFT JOIN (
SELECT thread_id, MAX(stream_ordering) AS receipt_stream_ordering
FROM receipts_linearized
LEFT JOIN events USING (room_id, event_id)
WHERE
user_id = ?
AND room_id = ?
AND {receipt_types_clause}
GROUP BY thread_id
) AS receipts USING (thread_id)
WHERE room_id = ? AND user_id = ?
AND (
(last_receipt_stream_ordering IS NULL AND stream_ordering > ?)
OR last_receipt_stream_ordering = ?
(last_receipt_stream_ordering IS NULL AND stream_ordering > {receipt_stream_clause})
OR last_receipt_stream_ordering = {receipt_stream_clause}
) AND (notif_count != 0 OR COALESCE(unread_count, 0) != 0)
""",
(room_id, user_id, receipt_stream_ordering, receipt_stream_ordering),
(
user_id,
room_id,
*receipts_args,
room_id,
user_id,
receipt_stream_ordering,
receipt_stream_ordering,
),
)
max_summary_stream_ordering = 0
for summary_stream_ordering, notif_count, unread_count, thread_id in txn:
summarised_threads = set()
for notif_count, unread_count, thread_id in txn:
summarised_threads.add(thread_id)
counts = _get_thread(thread_id)
counts.notify_count += notif_count
counts.unread_count += unread_count

# Summaries will only be used if they have not been invalidated by
# a recent receipt; track the latest stream ordering or a valid summary.
#
# Note that since there's only one read receipt in the room per user,
# valid summaries are contiguous.
max_summary_stream_ordering = max(
summary_stream_ordering, max_summary_stream_ordering
)

# Next we need to count highlights, which aren't summarised
sql = """
sql = f"""
SELECT COUNT(*), thread_id FROM event_push_actions
LEFT JOIN (
SELECT thread_id, MAX(stream_ordering) AS receipt_stream_ordering
FROM receipts_linearized
LEFT JOIN events USING (room_id, event_id)
WHERE
user_id = ?
AND room_id = ?
AND {receipt_types_clause}
GROUP BY thread_id
) AS receipts USING (thread_id)
WHERE user_id = ?
AND room_id = ?
AND stream_ordering > ?
AND stream_ordering > {receipt_stream_clause}
AND highlight = 1
GROUP BY thread_id
"""
txn.execute(sql, (user_id, room_id, receipt_stream_ordering))
txn.execute(
sql,
(
user_id,
room_id,
*receipts_args,
user_id,
room_id,
receipt_stream_ordering,
),
)
for highlight_count, thread_id in txn:
_get_thread(thread_id).highlight_count += highlight_count

# For threads which were summarised we need to count actions since the last
# rotation.
thread_id_clause, thread_id_args = make_in_list_sql_clause(
self.database_engine, "thread_id", summarised_threads
)

# The (inclusive) event stream ordering that was previously summarised.
rotated_upto_stream_ordering = self.db_pool.simple_select_one_onecol_txn(
txn,
table="event_push_summary_stream_ordering",
keyvalues={},
retcol="stream_ordering",
)

unread_counts = self._get_notif_unread_count_for_user_room(
txn, room_id, user_id, rotated_upto_stream_ordering
)
for notif_count, unread_count, thread_id in unread_counts:
if thread_id not in summarised_threads:
continue

if thread_id == "main":
counts.notify_count += notif_count
counts.unread_count += unread_count
elif thread_id in thread_counts:
thread_counts[thread_id].notify_count += notif_count
thread_counts[thread_id].unread_count += unread_count
else:
# Previous thread summaries of 0 are discarded above.
#
# TODO If empty summaries are deleted this can be removed.
thread_counts[thread_id] = NotifCounts(
notify_count=notif_count,
unread_count=unread_count,
highlight_count=0,
)

# Finally we need to count push actions that aren't included in the
# summary returned above. This might be due to recent events that haven't
# been summarised yet or the summary is out of date due to a recent read
# receipt.
start_unread_stream_ordering = max(
receipt_stream_ordering, max_summary_stream_ordering
)
unread_counts = self._get_notif_unread_count_for_user_room(
txn, room_id, user_id, start_unread_stream_ordering
sql = f"""
SELECT
COUNT(CASE WHEN notif = 1 THEN 1 END),
COUNT(CASE WHEN unread = 1 THEN 1 END),
thread_id
FROM event_push_actions
LEFT JOIN (
SELECT thread_id, MAX(stream_ordering) AS receipt_stream_ordering
FROM receipts_linearized
LEFT JOIN events USING (room_id, event_id)
WHERE
user_id = ?
AND room_id = ?
AND {receipt_types_clause}
GROUP BY thread_id
) AS receipts USING (thread_id)
WHERE user_id = ?
AND room_id = ?
AND stream_ordering > {receipt_stream_clause}
AND NOT {thread_id_clause}
GROUP BY thread_id
"""
txn.execute(
sql,
(
user_id,
room_id,
*receipts_args,
user_id,
room_id,
receipt_stream_ordering,
*thread_id_args,
),
)

for notif_count, unread_count, thread_id in unread_counts:
for notif_count, unread_count, thread_id in txn:
counts = _get_thread(thread_id)
counts.notify_count += notif_count
counts.unread_count += unread_count
Expand All @@ -522,6 +631,7 @@ def _get_notif_unread_count_for_user_room(
user_id: str,
stream_ordering: int,
max_stream_ordering: Optional[int] = None,
thread_id: Optional[str] = None,
) -> List[Tuple[int, int, str]]:
"""Returns the notify and unread counts from `event_push_actions` for
the given user/room in the given range.
Expand All @@ -547,17 +657,22 @@ def _get_notif_unread_count_for_user_room(
if not self._events_stream_cache.has_entity_changed(room_id, stream_ordering):
return []

clause = ""
stream_ordering_clause = ""
args = [user_id, room_id, stream_ordering]
if max_stream_ordering is not None:
clause = "AND ea.stream_ordering <= ?"
stream_ordering_clause = "AND ea.stream_ordering <= ?"
args.append(max_stream_ordering)

# If the max stream ordering is less than the min stream ordering,
# then obviously there are zero push actions in that range.
if max_stream_ordering <= stream_ordering:
return []

thread_id_clause = ""
if thread_id is not None:
thread_id_clause = "AND thread_id = ?"
args.append(thread_id)

sql = f"""
SELECT
COUNT(CASE WHEN notif = 1 THEN 1 END),
Expand All @@ -567,7 +682,8 @@ def _get_notif_unread_count_for_user_room(
WHERE user_id = ?
AND room_id = ?
AND ea.stream_ordering > ?
{clause}
{stream_ordering_clause}
{thread_id_clause}
GROUP BY thread_id
"""

Expand Down Expand Up @@ -1083,7 +1199,7 @@ def _handle_new_receipts_for_notifs_txn(self, txn: LoggingTransaction) -> bool:
)

sql = """
SELECT r.stream_id, r.room_id, r.user_id, e.stream_ordering
SELECT r.stream_id, r.room_id, r.user_id, r.thread_id, e.stream_ordering
FROM receipts_linearized AS r
INNER JOIN events AS e USING (event_id)
WHERE ? < r.stream_id AND r.stream_id <= ? AND user_id LIKE ?
Expand All @@ -1106,13 +1222,18 @@ def _handle_new_receipts_for_notifs_txn(self, txn: LoggingTransaction) -> bool:
)
rows = txn.fetchall()

# For each new read receipt we delete push actions from before it and
# recalculate the summary.
for _, room_id, user_id, stream_ordering in rows:
# First handle all the rows without a thread ID (i.e. ones that apply to
# the entire room).
for _, room_id, user_id, thread_id, stream_ordering in rows:
# Only handle our own read receipts.
if not self.hs.is_mine_id(user_id):
continue

if thread_id is not None:
continue

# For each new read receipt we delete push actions from before it and
# recalculate the summary.
txn.execute(
"""
DELETE FROM event_push_actions
Expand Down Expand Up @@ -1154,6 +1275,64 @@ def _handle_new_receipts_for_notifs_txn(self, txn: LoggingTransaction) -> bool:
value_values=[(row[0], row[1]) for row in unread_counts],
)

# For each new read receipt we delete push actions from before it and
# recalculate the summary.
for _, room_id, user_id, thread_id, stream_ordering in rows:
# Only handle our own read receipts.
if not self.hs.is_mine_id(user_id):
continue

if thread_id is None:
continue

# For each new read receipt we delete push actions from before it and
# recalculate the summary.
txn.execute(
"""
DELETE FROM event_push_actions
WHERE room_id = ?
AND user_id = ?
AND thread_id = ?
AND stream_ordering <= ?
AND highlight = 0
""",
(room_id, user_id, thread_id, stream_ordering),
)

# Fetch the notification counts between the stream ordering of the
# latest receipt and what was previously summarised.
unread_counts = self._get_notif_unread_count_for_user_room(
txn,
room_id,
user_id,
stream_ordering,
old_rotate_stream_ordering,
thread_id,
)
# unread_counts will be a list of 0 or 1 items.
if unread_counts:
notif_count, unread_count, _ = unread_counts[0]
else:
notif_count = 0
unread_count = 0

# Update the summary of this specific thread.
self.db_pool.simple_upsert_txn(
txn,
table="event_push_summary",
keyvalues={
"room_id": room_id,
"user_id": user_id,
"thread_id": thread_id,
},
values={
"notif_count": notif_count,
"unread_count": unread_count,
"stream_ordering": old_rotate_stream_ordering,
"last_receipt_stream_ordering": stream_ordering,
},
)

# We always update `event_push_summary_last_receipt_stream_id` to
# ensure that we don't rescan the same receipts for remote users.

Expand Down
5 changes: 3 additions & 2 deletions synapse/storage/databases/main/receipts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -170,8 +170,8 @@ def get_last_receipt_for_user_txn(
receipt_types: Collection[str],
) -> Optional[Tuple[str, int]]:
"""
Fetch the event ID and stream_ordering for the latest receipt in a room
with one of the given receipt types.
Fetch the event ID and stream_ordering for the latest unthreaded receipt
in a room with one of the given receipt types.
Args:
user_id: The user to fetch receipts for.
Expand All @@ -193,6 +193,7 @@ def get_last_receipt_for_user_txn(
WHERE {clause}
AND user_id = ?
AND room_id = ?
AND thread_id IS NULL
ORDER BY stream_ordering DESC
LIMIT 1
"""
Expand Down
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