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LoggingTransaction accepts None for callback lists.

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Its a bit disingenuousto give LoggingTransaction lists to append
callbacks to if we're not going to run the callbacks.
This commit is contained in:
Erik Johnston 2019-07-19 13:36:04 +01:00
parent ebc5ed1296
commit bd2e1a2aa8
3 changed files with 16 additions and 6 deletions
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18
synapse/storage/_base.py
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@ -86,7 +86,21 @@ _CURRENT_STATE_CACHE_NAME = "cs_cache_fake"
class LoggingTransaction(object):
"""An object that almost-transparently proxies for the 'txn' object
passed to the constructor. Adds logging and metrics to the .execute()
method."""
method.
Args:
txn: The database transcation object to wrap.
name (str): The name of this transactions for logging.
database_engine (Sqlite3Engine|PostgresEngine)
after_callbacks(list|None): A list that callbacks will be appended to
that have been added by `call_after` which should be run on
successful completion of the transaction. None indicates that no
callbacks should be allowed to be scheduled to run.
exception_callbacks(list|None): A list that callbacks will be appended
to that have been added by `call_on_exception` which should be run
if transaction ends with an error. None indicates that no callbacks
should be allowed to be scheduled to run.
"""
__slots__ = [
"txn",
@ -97,7 +111,7 @@ class LoggingTransaction(object):
]
def __init__(
self, txn, name, database_engine, after_callbacks, exception_callbacks
self, txn, name, database_engine, after_callbacks=None, exception_callbacks=None
):
object.__setattr__(self, "txn", txn)
object.__setattr__(self, "name", name)