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Recover and restart the recorder if the sqlite database encounters corruption while running (#46612)

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This commit is contained in:
J. Nick Koston 2021-02-19 21:26:24 -10:00 committed by GitHub
parent 5b0b01d727
commit 9b69549f73
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5 changed files with 288 additions and 198 deletions
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393
homeassistant/components/recorder/__init__.py
View File

@ -5,6 +5,7 @@ import concurrent.futures
from datetime import datetime
import logging
import queue
import sqlite3
import threading
import time
from typing import Any, Callable, List, Optional
@ -37,7 +38,12 @@ import homeassistant.util.dt as dt_util
from . import migration, purge
from .const import CONF_DB_INTEGRITY_CHECK, DATA_INSTANCE, DOMAIN, SQLITE_URL_PREFIX
from .models import Base, Events, RecorderRuns, States
from .util import session_scope, validate_or_move_away_sqlite_database
from .util import (
dburl_to_path,
move_away_broken_database,
session_scope,
validate_or_move_away_sqlite_database,
)
_LOGGER = logging.getLogger(__name__)
@ -247,7 +253,7 @@ class Recorder(threading.Thread):
self._pending_expunge = []
self.event_session = None
self.get_session = None
self._completed_database_setup = False
self._completed_database_setup = None
@callback
def async_initialize(self):
@ -278,39 +284,8 @@ class Recorder(threading.Thread):
def run(self):
"""Start processing events to save."""
tries = 1
connected = False
while not connected and tries <= self.db_max_retries:
if tries != 1:
time.sleep(self.db_retry_wait)
try:
self._setup_connection()
migration.migrate_schema(self)
self._setup_run()
connected = True
_LOGGER.debug("Connected to recorder database")
except Exception as err: # pylint: disable=broad-except
_LOGGER.error(
"Error during connection setup: %s (retrying in %s seconds)",
err,
self.db_retry_wait,
)
tries += 1
if not connected:
@callback
def connection_failed():
"""Connect failed tasks."""
self.async_db_ready.set_result(False)
persistent_notification.async_create(
self.hass,
"The recorder could not start, please check the log",
"Recorder",
)
self.hass.add_job(connection_failed)
if not self._setup_recorder():
return
shutdown_task = object()
@ -346,15 +321,11 @@ class Recorder(threading.Thread):
self.hass.add_job(register)
result = hass_started.result()
self.event_session = self.get_session()
self.event_session.expire_on_commit = False
# If shutdown happened before Home Assistant finished starting
if result is shutdown_task:
# Make sure we cleanly close the run if
# we restart before startup finishes
self._close_run()
self._close_connection()
self._shutdown()
return
# Start periodic purge
@ -370,175 +341,180 @@ class Recorder(threading.Thread):
async_purge, hour=4, minute=12, second=0
)
_LOGGER.debug("Recorder processing the queue")
# Use a session for the event read loop
# with a commit every time the event time
# has changed. This reduces the disk io.
while True:
event = self.queue.get()
if event is None:
self._close_run()
self._close_connection()
self._shutdown()
return
if isinstance(event, PurgeTask):
# Schedule a new purge task if this one didn't finish
if not purge.purge_old_data(self, event.keep_days, event.repack):
self.queue.put(PurgeTask(event.keep_days, event.repack))
continue
if isinstance(event, WaitTask):
self._queue_watch.set()
continue
if event.event_type == EVENT_TIME_CHANGED:
self._keepalive_count += 1
if self._keepalive_count >= KEEPALIVE_TIME:
self._keepalive_count = 0
self._send_keep_alive()
if self.commit_interval:
self._timechanges_seen += 1
if self._timechanges_seen >= self.commit_interval:
self._timechanges_seen = 0
self._commit_event_session_or_retry()
continue
self._process_one_event(event)
def _setup_recorder(self) -> bool:
"""Create schema and connect to the database."""
tries = 1
while tries <= self.db_max_retries:
try:
if event.event_type == EVENT_STATE_CHANGED:
dbevent = Events.from_event(event, event_data="{}")
else:
dbevent = Events.from_event(event)
dbevent.created = event.time_fired
self.event_session.add(dbevent)
except (TypeError, ValueError):
_LOGGER.warning("Event is not JSON serializable: %s", event)
self._setup_connection()
migration.migrate_schema(self)
self._setup_run()
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Error adding event: %s", err)
_LOGGER.error(
"Error during connection setup to %s: %s (retrying in %s seconds)",
self.db_url,
err,
self.db_retry_wait,
)
else:
_LOGGER.debug("Connected to recorder database")
self._open_event_session()
return True
if dbevent and event.event_type == EVENT_STATE_CHANGED:
try:
dbstate = States.from_event(event)
has_new_state = event.data.get("new_state")
if dbstate.entity_id in self._old_states:
old_state = self._old_states.pop(dbstate.entity_id)
if old_state.state_id:
dbstate.old_state_id = old_state.state_id
else:
dbstate.old_state = old_state
if not has_new_state:
dbstate.state = None
dbstate.event = dbevent
dbstate.created = event.time_fired
self.event_session.add(dbstate)
if has_new_state:
self._old_states[dbstate.entity_id] = dbstate
self._pending_expunge.append(dbstate)
except (TypeError, ValueError):
_LOGGER.warning(
"State is not JSON serializable: %s",
event.data.get("new_state"),
)
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Error adding state change: %s", err)
tries += 1
time.sleep(self.db_retry_wait)
# If they do not have a commit interval
# than we commit right away
if not self.commit_interval:
self._commit_event_session_or_retry()
@callback
def connection_failed():
"""Connect failed tasks."""
self.async_db_ready.set_result(False)
persistent_notification.async_create(
self.hass,
"The recorder could not start, please check the log",
"Recorder",
)
self.hass.add_job(connection_failed)
return False
def _process_one_event(self, event):
"""Process one event."""
if isinstance(event, PurgeTask):
# Schedule a new purge task if this one didn't finish
if not purge.purge_old_data(self, event.keep_days, event.repack):
self.queue.put(PurgeTask(event.keep_days, event.repack))
return
if isinstance(event, WaitTask):
self._queue_watch.set()
return
if event.event_type == EVENT_TIME_CHANGED:
self._keepalive_count += 1
if self._keepalive_count >= KEEPALIVE_TIME:
self._keepalive_count = 0
self._send_keep_alive()
if self.commit_interval:
self._timechanges_seen += 1
if self._timechanges_seen >= self.commit_interval:
self._timechanges_seen = 0
self._commit_event_session_or_recover()
return
def _send_keep_alive(self):
try:
_LOGGER.debug("Sending keepalive")
self.event_session.connection().scalar(select([1]))
if event.event_type == EVENT_STATE_CHANGED:
dbevent = Events.from_event(event, event_data="{}")
else:
dbevent = Events.from_event(event)
dbevent.created = event.time_fired
self.event_session.add(dbevent)
except (TypeError, ValueError):
_LOGGER.warning("Event is not JSON serializable: %s", event)
return
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.error(
"Error in database connectivity during keepalive: %s",
err,
)
self._reopen_event_session()
_LOGGER.exception("Error adding event: %s", err)
return
if event.event_type == EVENT_STATE_CHANGED:
try:
dbstate = States.from_event(event)
has_new_state = event.data.get("new_state")
if dbstate.entity_id in self._old_states:
old_state = self._old_states.pop(dbstate.entity_id)
if old_state.state_id:
dbstate.old_state_id = old_state.state_id
else:
dbstate.old_state = old_state
if not has_new_state:
dbstate.state = None
dbstate.event = dbevent
dbstate.created = event.time_fired
self.event_session.add(dbstate)
if has_new_state:
self._old_states[dbstate.entity_id] = dbstate
self._pending_expunge.append(dbstate)
except (TypeError, ValueError):
_LOGGER.warning(
"State is not JSON serializable: %s",
event.data.get("new_state"),
)
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Error adding state change: %s", err)
# If they do not have a commit interval
# than we commit right away
if not self.commit_interval:
self._commit_event_session_or_recover()
def _commit_event_session_or_recover(self):
"""Commit changes to the database and recover if the database fails when possible."""
try:
self._commit_event_session_or_retry()
return
except exc.DatabaseError as err:
if isinstance(err.__cause__, sqlite3.DatabaseError):
_LOGGER.exception(
"Unrecoverable sqlite3 database corruption detected: %s", err
)
self._handle_sqlite_corruption()
return
_LOGGER.exception("Unexpected error saving events: %s", err)
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Unexpected error saving events: %s", err)
self._reopen_event_session()
return
def _commit_event_session_or_retry(self):
tries = 1
while tries <= self.db_max_retries:
if tries != 1:
time.sleep(self.db_retry_wait)
try:
self._commit_event_session()
return
except (exc.InternalError, exc.OperationalError) as err:
if err.connection_invalidated:
_LOGGER.error(
"Database connection invalidated: %s. "
"(retrying in %s seconds)",
err,
self.db_retry_wait,
)
message = "Database connection invalidated"
else:
_LOGGER.error(
"Error in database connectivity during commit: %s. "
"(retrying in %s seconds)",
err,
self.db_retry_wait,
)
message = "Error in database connectivity during commit"
_LOGGER.error(
"%s: Error executing query: %s. (retrying in %s seconds)",
message,
err,
self.db_retry_wait,
)
if tries == self.db_max_retries:
raise
tries += 1
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Error saving events: %s", err)
return
_LOGGER.error(
"Error in database update. Could not save " "after %d tries. Giving up",
tries,
)
self._reopen_event_session()
def _reopen_event_session(self):
try:
self.event_session.rollback()
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Error while rolling back event session: %s", err)
try:
self.event_session.close()
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Error while closing event session: %s", err)
try:
self.event_session = self.get_session()
self.event_session.expire_on_commit = False
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception("Error while creating new event session: %s", err)
time.sleep(self.db_retry_wait)
def _commit_event_session(self):
self._commits_without_expire += 1
try:
if self._pending_expunge:
self.event_session.flush()
for dbstate in self._pending_expunge:
# Expunge the state so its not expired
# until we use it later for dbstate.old_state
if dbstate in self.event_session:
self.event_session.expunge(dbstate)
self._pending_expunge = []
self.event_session.commit()
except exc.IntegrityError as err:
_LOGGER.error(
"Integrity error executing query (database likely deleted out from under us): %s",
err,
)
self.event_session.rollback()
self._old_states = {}
raise
except Exception as err:
_LOGGER.error("Error executing query: %s", err)
self.event_session.rollback()
raise
if self._pending_expunge:
self.event_session.flush()
for dbstate in self._pending_expunge:
# Expunge the state so its not expired
# until we use it later for dbstate.old_state
if dbstate in self.event_session:
self.event_session.expunge(dbstate)
self._pending_expunge = []
self.event_session.commit()
# Expire is an expensive operation (frequently more expensive
# than the flush and commit itself) so we only
@ -547,6 +523,47 @@ class Recorder(threading.Thread):
self._commits_without_expire = 0
self.event_session.expire_all()
def _handle_sqlite_corruption(self):
"""Handle the sqlite3 database being corrupt."""
self._close_connection()
move_away_broken_database(dburl_to_path(self.db_url))
self._setup_recorder()
def _reopen_event_session(self):
"""Rollback the event session and reopen it after a failure."""
self._old_states = {}
try:
self.event_session.rollback()
self.event_session.close()
except Exception as err: # pylint: disable=broad-except
# Must catch the exception to prevent the loop from collapsing
_LOGGER.exception(
"Error while rolling back and closing the event session: %s", err
)
self._open_event_session()
def _open_event_session(self):
"""Open the event session."""
try:
self.event_session = self.get_session()
self.event_session.expire_on_commit = False
except Exception as err: # pylint: disable=broad-except
_LOGGER.exception("Error while creating new event session: %s", err)
def _send_keep_alive(self):
try:
_LOGGER.debug("Sending keepalive")
self.event_session.connection().scalar(select([1]))
return
except Exception as err: # pylint: disable=broad-except
_LOGGER.error(
"Error in database connectivity during keepalive: %s",
err,
)
self._reopen_event_session()
@callback
def event_listener(self, event):
"""Listen for new events and put them in the process queue."""
@ -571,6 +588,7 @@ class Recorder(threading.Thread):
def _setup_connection(self):
"""Ensure database is ready to fly."""
kwargs = {}
self._completed_database_setup = False
def setup_recorder_connection(dbapi_connection, connection_record):
"""Dbapi specific connection settings."""
@ -603,9 +621,7 @@ class Recorder(threading.Thread):
else:
kwargs["echo"] = False
if self.db_url != SQLITE_URL_PREFIX and self.db_url.startswith(
SQLITE_URL_PREFIX
):
if self._using_file_sqlite:
with self.hass.timeout.freeze(DOMAIN):
#
# Here we run an sqlite3 quick_check. In the majority
@ -628,6 +644,13 @@ class Recorder(threading.Thread):
Base.metadata.create_all(self.engine)
self.get_session = scoped_session(sessionmaker(bind=self.engine))
@property
def _using_file_sqlite(self):
"""Short version to check if we are using sqlite3 as a file."""
return self.db_url != SQLITE_URL_PREFIX and self.db_url.startswith(
SQLITE_URL_PREFIX
)
def _close_connection(self):
"""Close the connection."""
self.engine.dispose()
@ -652,12 +675,18 @@ class Recorder(threading.Thread):
session.flush()
session.expunge(self.run_info)
def _close_run(self):
def _shutdown(self):
"""Save end time for current run."""
if self.event_session is not None:
self.run_info.end = dt_util.utcnow()
self.event_session.add(self.run_info)
self._commit_event_session_or_retry()
self.event_session.close()
try:
self._commit_event_session_or_retry()
self.event_session.close()
except Exception as err: # pylint: disable=broad-except
_LOGGER.exception(
"Error saving the event session during shutdown: %s", err
)
self.run_info = None
self._close_connection()

11
homeassistant/components/recorder/util.py
View File

@ -112,19 +112,24 @@ def execute(qry, to_native=False, validate_entity_ids=True):
def validate_or_move_away_sqlite_database(dburl: str, db_integrity_check: bool) -> bool:
"""Ensure that the database is valid or move it away."""
dbpath = dburl[len(SQLITE_URL_PREFIX) :]
dbpath = dburl_to_path(dburl)
if not os.path.exists(dbpath):
# Database does not exist yet, this is OK
return True
if not validate_sqlite_database(dbpath, db_integrity_check):
_move_away_broken_database(dbpath)
move_away_broken_database(dbpath)
return False
return True
def dburl_to_path(dburl):
"""Convert the db url into a filesystem path."""
return dburl[len(SQLITE_URL_PREFIX) :]
def last_run_was_recently_clean(cursor):
"""Verify the last recorder run was recently clean."""
@ -208,7 +213,7 @@ def run_checks_on_open_db(dbpath, cursor, db_integrity_check):
cursor.execute("PRAGMA QUICK_CHECK")
def _move_away_broken_database(dbfile: str) -> None:
def move_away_broken_database(dbfile: str) -> None:
"""Move away a broken sqlite3 database."""
isotime = dt_util.utcnow().isoformat()

13
tests/components/recorder/common.py
View File

@ -10,14 +10,27 @@ from tests.common import fire_time_changed
def wait_recording_done(hass):
"""Block till recording is done."""
hass.block_till_done()
trigger_db_commit(hass)
hass.block_till_done()
hass.data[recorder.DATA_INSTANCE].block_till_done()
hass.block_till_done()
async def async_wait_recording_done(hass):
"""Block till recording is done."""
await hass.loop.run_in_executor(None, wait_recording_done, hass)
def trigger_db_commit(hass):
"""Force the recorder to commit."""
for _ in range(recorder.DEFAULT_COMMIT_INTERVAL):
# We only commit on time change
fire_time_changed(hass, dt_util.utcnow() + timedelta(seconds=1))
def corrupt_db_file(test_db_file):
"""Corrupt an sqlite3 database file."""
with open(test_db_file, "w+") as fhandle:
fhandle.seek(200)
fhandle.write("I am a corrupt db" * 100)

54
tests/components/recorder/test_init.py
View File

@ -6,6 +6,7 @@ from unittest.mock import patch
from sqlalchemy.exc import OperationalError
from homeassistant.components.recorder import (
CONF_DB_URL,
CONFIG_SCHEMA,
DOMAIN,
Recorder,
@ -13,7 +14,7 @@ from homeassistant.components.recorder import (
run_information_from_instance,
run_information_with_session,
)
from homeassistant.components.recorder.const import DATA_INSTANCE
from homeassistant.components.recorder.const import DATA_INSTANCE, SQLITE_URL_PREFIX
from homeassistant.components.recorder.models import Events, RecorderRuns, States
from homeassistant.components.recorder.util import session_scope
from homeassistant.const import (
@ -26,7 +27,7 @@ from homeassistant.core import Context, CoreState, callback
from homeassistant.setup import async_setup_component
from homeassistant.util import dt as dt_util
from .common import wait_recording_done
from .common import async_wait_recording_done, corrupt_db_file, wait_recording_done
from tests.common import (
async_init_recorder_component,
@ -519,3 +520,52 @@ def test_run_information(hass_recorder):
class CannotSerializeMe:
"""A class that the JSONEncoder cannot serialize."""
async def test_database_corruption_while_running(hass, tmpdir, caplog):
"""Test we can recover from sqlite3 db corruption."""
def _create_tmpdir_for_test_db():
return tmpdir.mkdir("sqlite").join("test.db")
test_db_file = await hass.async_add_executor_job(_create_tmpdir_for_test_db)
dburl = f"{SQLITE_URL_PREFIX}//{test_db_file}"
assert await async_setup_component(hass, DOMAIN, {DOMAIN: {CONF_DB_URL: dburl}})
await hass.async_block_till_done()
caplog.clear()
hass.states.async_set("test.lost", "on", {})
await async_wait_recording_done(hass)
await hass.async_add_executor_job(corrupt_db_file, test_db_file)
await async_wait_recording_done(hass)
# This state will not be recorded because
# the database corruption will be discovered
# and we will have to rollback to recover
hass.states.async_set("test.one", "off", {})
await async_wait_recording_done(hass)
assert "Unrecoverable sqlite3 database corruption detected" in caplog.text
assert "The system will rename the corrupt database file" in caplog.text
assert "Connected to recorder database" in caplog.text
# This state should go into the new database
hass.states.async_set("test.two", "on", {})
await async_wait_recording_done(hass)
def _get_last_state():
with session_scope(hass=hass) as session:
db_states = list(session.query(States))
assert len(db_states) == 1
assert db_states[0].event_id > 0
return db_states[0].to_native()
state = await hass.async_add_executor_job(_get_last_state)
assert state.entity_id == "test.two"
assert state.state == "on"
hass.bus.async_fire(EVENT_HOMEASSISTANT_STOP)
await hass.async_block_till_done()
hass.stop()

15
tests/components/recorder/test_util.py
View File

@ -10,7 +10,7 @@ from homeassistant.components.recorder import util
from homeassistant.components.recorder.const import DATA_INSTANCE, SQLITE_URL_PREFIX
from homeassistant.util import dt as dt_util
from .common import wait_recording_done
from .common import corrupt_db_file, wait_recording_done
from tests.common import get_test_home_assistant, init_recorder_component
@ -90,7 +90,7 @@ def test_validate_or_move_away_sqlite_database_with_integrity_check(
util.validate_or_move_away_sqlite_database(dburl, db_integrity_check) is False
)
_corrupt_db_file(test_db_file)
corrupt_db_file(test_db_file)
assert util.validate_sqlite_database(dburl, db_integrity_check) is False
@ -127,7 +127,7 @@ def test_validate_or_move_away_sqlite_database_without_integrity_check(
util.validate_or_move_away_sqlite_database(dburl, db_integrity_check) is False
)
_corrupt_db_file(test_db_file)
corrupt_db_file(test_db_file)
assert util.validate_sqlite_database(dburl, db_integrity_check) is False
@ -150,7 +150,7 @@ def test_last_run_was_recently_clean(hass_recorder):
assert util.last_run_was_recently_clean(cursor) is False
hass.data[DATA_INSTANCE]._close_run()
hass.data[DATA_INSTANCE]._shutdown()
wait_recording_done(hass)
assert util.last_run_was_recently_clean(cursor) is True
@ -244,10 +244,3 @@ def test_combined_checks(hass_recorder, caplog):
caplog.clear()
with pytest.raises(sqlite3.DatabaseError):
util.run_checks_on_open_db("fake_db_path", cursor, True)
def _corrupt_db_file(test_db_file):
"""Corrupt an sqlite3 database file."""
f = open(test_db_file, "a")
f.write("I am a corrupt db")
f.close()