diff options
Diffstat (limited to 'synapse')
| -rw-r--r-- | synapse/storage/_base.py | 51 | ||||
| -rw-r--r-- | synapse/storage/data_stores/main/receipts.py | 2 |
2 files changed, 43 insertions, 10 deletions
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py index 6b8a9cd89a..459901ac60 100644 --- a/synapse/storage/_base.py +++ b/synapse/storage/_base.py @@ -409,16 +409,15 @@ class SQLBaseStore(object): i = 0 N = 5 while True: + cursor = LoggingTransaction( + conn.cursor(), + name, + self.database_engine, + after_callbacks, + exception_callbacks, + ) try: - txn = conn.cursor() - txn = LoggingTransaction( - txn, - name, - self.database_engine, - after_callbacks, - exception_callbacks, - ) - r = func(txn, *args, **kwargs) + r = func(cursor, *args, **kwargs) conn.commit() return r except self.database_engine.module.OperationalError as e: @@ -456,6 +455,40 @@ class SQLBaseStore(object): ) continue raise + finally: + # we're either about to retry with a new cursor, or we're about to + # release the connection. Once we release the connection, it could + # get used for another query, which might do a conn.rollback(). + # + # In the latter case, even though that probably wouldn't affect the + # results of this transaction, python's sqlite will reset all + # statements on the connection [1], which will make our cursor + # invalid [2]. + # + # In any case, continuing to read rows after commit()ing seems + # dubious from the PoV of ACID transactional semantics + # (sqlite explicitly says that once you commit, you may see rows + # from subsequent updates.) + # + # In psycopg2, cursors are essentially a client-side fabrication - + # all the data is transferred to the client side when the statement + # finishes executing - so in theory we could go on streaming results + # from the cursor, but attempting to do so would make us + # incompatible with sqlite, so let's make sure we're not doing that + # by closing the cursor. + # + # (*named* cursors in psycopg2 are different and are proper server- + # side things, but (a) we don't use them and (b) they are implicitly + # closed by ending the transaction anyway.) + # + # In short, if we haven't finished with the cursor yet, that's a + # problem waiting to bite us. + # + # TL;DR: we're done with the cursor, so we can close it. + # + # [1]: https://github.com/python/cpython/blob/v3.8.0/Modules/_sqlite/connection.c#L465 + # [2]: https://github.com/python/cpython/blob/v3.8.0/Modules/_sqlite/cursor.c#L236 + cursor.close() except Exception as e: logger.debug("[TXN FAIL] {%s} %s", name, e) raise diff --git a/synapse/storage/data_stores/main/receipts.py b/synapse/storage/data_stores/main/receipts.py index 0c24430f28..8b17334ff4 100644 --- a/synapse/storage/data_stores/main/receipts.py +++ b/synapse/storage/data_stores/main/receipts.py @@ -280,7 +280,7 @@ class ReceiptsWorkerStore(SQLBaseStore): args.append(limit) txn.execute(sql, args) - return (r[0:5] + (json.loads(r[5]),) for r in txn) + return list(r[0:5] + (json.loads(r[5]),) for r in txn) return self.runInteraction( "get_all_updated_receipts", get_all_updated_receipts_txn |