mirror of
https://github.com/home-assistant/core
synced 2024-09-03 08:14:07 +02:00
![Ville Skyttä](/assets/img/avatar_default.png)
* Remove bunch of unneeded lint exclusions * Use symbolic names instead of identifiers in pylint disables * Tighten scope of some pylint disables
84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
"""SQLAlchemy util functions."""
|
|
from contextlib import contextmanager
|
|
import logging
|
|
import time
|
|
|
|
from sqlalchemy.exc import OperationalError, SQLAlchemyError
|
|
|
|
from .const import DATA_INSTANCE
|
|
|
|
_LOGGER = logging.getLogger(__name__)
|
|
|
|
RETRIES = 3
|
|
QUERY_RETRY_WAIT = 0.1
|
|
|
|
|
|
@contextmanager
|
|
def session_scope(*, hass=None, session=None):
|
|
"""Provide a transactional scope around a series of operations."""
|
|
if session is None and hass is not None:
|
|
session = hass.data[DATA_INSTANCE].get_session()
|
|
|
|
if session is None:
|
|
raise RuntimeError("Session required")
|
|
|
|
need_rollback = False
|
|
try:
|
|
yield session
|
|
if session.transaction:
|
|
need_rollback = True
|
|
session.commit()
|
|
except Exception as err:
|
|
_LOGGER.error("Error executing query: %s", err)
|
|
if need_rollback:
|
|
session.rollback()
|
|
raise
|
|
finally:
|
|
session.close()
|
|
|
|
|
|
def commit(session, work):
|
|
"""Commit & retry work: Either a model or in a function."""
|
|
for _ in range(0, RETRIES):
|
|
try:
|
|
if callable(work):
|
|
work(session)
|
|
else:
|
|
session.add(work)
|
|
session.commit()
|
|
return True
|
|
except OperationalError as err:
|
|
_LOGGER.error("Error executing query: %s", err)
|
|
session.rollback()
|
|
time.sleep(QUERY_RETRY_WAIT)
|
|
return False
|
|
|
|
|
|
def execute(qry):
|
|
"""Query the database and convert the objects to HA native form.
|
|
|
|
This method also retries a few times in the case of stale connections.
|
|
"""
|
|
for tryno in range(0, RETRIES):
|
|
try:
|
|
timer_start = time.perf_counter()
|
|
result = [
|
|
row for row in (row.to_native() for row in qry) if row is not None
|
|
]
|
|
|
|
if _LOGGER.isEnabledFor(logging.DEBUG):
|
|
elapsed = time.perf_counter() - timer_start
|
|
_LOGGER.debug(
|
|
"converting %d rows to native objects took %fs",
|
|
len(result),
|
|
elapsed,
|
|
)
|
|
|
|
return result
|
|
except SQLAlchemyError as err:
|
|
_LOGGER.error("Error executing query: %s", err)
|
|
|
|
if tryno == RETRIES - 1:
|
|
raise
|
|
time.sleep(QUERY_RETRY_WAIT)
|