def sync(self, parsed_stops: typing.Iterable[parse.Stop]):
# NOTE: the stop tree is manually linked together because otherwise SQL
# Alchemy's cascades will result in duplicate entries in the DB because the
# models do not have PKs yet.
stop_id_to_parent_stop_id = {}
stops = []
for parsed_stop in parsed_stops:
stop = models.Stop.from_parsed_stop(parsed_stop)
stop.system_pk = self.feed_update.feed.system_pk
if parsed_stop.parent_stop is not None:
stop_id_to_parent_stop_id[
parsed_stop.id] = parsed_stop.parent_stop.id
else:
stop_id_to_parent_stop_id[parsed_stop.id] = None
stops.append(stop)
persisted_stops, num_added, num_updated = self._merge_entities(stops)
stop_id_to_persisted_stops = {
stop.id: stop
for stop in persisted_stops
}
# NOTE: flush the session the session to populate the primary keys
dbconnection.get_session().flush()
for stop_id in stop_id_to_parent_stop_id.keys():
stop = stop_id_to_persisted_stops[stop_id]
parent_stop = stop_id_to_persisted_stops.get(
stop_id_to_parent_stop_id.get(stop.id))
if parent_stop is not None:
stop.parent_stop_pk = parent_stop.pk
else:
stop.parent_stop_pk = None
return num_added, num_updated
def test_outside_unit_of_work_error__after():
@dbconnection.unit_of_work
def uow():
return 1 + 1
uow()
with pytest.raises(dbconnection.OutsideUnitOfWorkError):
dbconnection.get_session()
def _create_feed_update_helper(system_id, feed_id,
update_type) -> typing.Optional[int]:
feed = feedqueries.get_in_system_by_id(system_id, feed_id)
if feed is None:
return None
feed_update = models.FeedUpdate()
feed_update.update_type = update_type
feed_update.status = feed_update.Status.SCHEDULED
feed_update.feed = feed
dbconnection.get_session().add(feed_update)
dbconnection.get_session().flush()
return feed_update.pk
def list_all_from_feed(feed_pk):
session = dbconnection.get_session()
query = session.query(models.Trip).filter(
models.Trip.source_pk == models.FeedUpdate.pk,
models.FeedUpdate.feed_pk == feed_pk,
)
return query.all()
def _get_entity_pk_to_active_alerts(entity_type, entity_relationship, pks,
current_time, load_messages):
pks = list(pks)
if len(pks) == 0:
return {}
if current_time is None:
current_time = datetime.datetime.utcnow()
query = (dbconnection.get_session().query(
entity_type.pk, models.AlertActivePeriod, models.Alert).filter(
models.AlertActivePeriod.alert_pk == models.Alert.pk).filter(
sql.or_(
models.AlertActivePeriod.starts_at <= current_time,
models.AlertActivePeriod.starts_at.is_(None),
)).filter(
sql.or_(
models.AlertActivePeriod.ends_at >= current_time,
models.AlertActivePeriod.ends_at.is_(None),
)).order_by(models.AlertActivePeriod.starts_at).join(
entity_relationship).filter(entity_type.pk.in_(pks)))
if load_messages:
query = query.options(joinedload(models.Alert.messages))
pk_to_alert_pks = collections.defaultdict(set)
pk_to_tuple = {pk: [] for pk in pks}
for pk, active_period, alert in query.all():
if alert.pk in pk_to_alert_pks[pk]:
continue
pk_to_alert_pks[pk].add(alert.pk)
pk_to_tuple[pk].append((active_period, alert))
return pk_to_tuple
def list_groups_and_maps_for_stops_in_route(route_pk):
"""
This function is used to get the service maps for a route.
It returns a list of tuples (service map group, service map) for each
service map group having use_for_stops_in_route equal True.
:param route_pk: the route's PK
:return: the list described above
"""
session = dbconnection.get_session()
query = (session.query(models.ServiceMapGroup, models.ServiceMap).join(
models.System,
models.System.pk == models.ServiceMapGroup.system_pk).join(
models.Route,
models.Route.system_pk == models.System.pk).outerjoin(
models.ServiceMap,
sql.and_(
models.ServiceMap.route_pk == models.Route.pk,
models.ServiceMap.group_pk == models.ServiceMapGroup.pk,
),
).filter(models.ServiceMapGroup.use_for_stops_in_route).filter(
models.Route.pk == route_pk).options(
selectinload(models.ServiceMap.vertices)).options(
selectinload(models.ServiceMap.vertices,
models.ServiceMapVertex.stop)))
return [(group, map_) for (group, map_) in query]
def get_scheduled_trip_pk_to_path_in_system(system_pk):
"""
Get a map of trip PK to the path of that trip for every scheduled trip in a system.
By path is meant a list of stop_pks that the trip stops at. This method completely
bypasses the ORM and so relatively efficient.
:param system_pk: the system's PK
:return: map of trip PK to list of stop PKs
"""
start_time = time.time()
session = dbconnection.get_session()
query = (session.query(
models.ScheduledTripStopTime.trip_pk,
models.ScheduledTripStopTime.stop_pk).join(
models.ScheduledTrip,
models.ScheduledTrip.pk == models.ScheduledTripStopTime.trip_pk,
).join(
models.ScheduledService,
sql.and_(
models.ScheduledService.pk == models.ScheduledTrip.service_pk,
models.ScheduledService.system_pk == system_pk,
),
).order_by(
models.ScheduledTripStopTime.trip_pk,
models.ScheduledTripStopTime.stop_sequence,
))
trip_pk_to_stop_pks = {}
for trip_pk, stop_pk in query:
if trip_pk not in trip_pk_to_stop_pks:
trip_pk_to_stop_pks[trip_pk] = []
trip_pk_to_stop_pks[trip_pk].append(stop_pk)
logger.info(
"Query get_scheduled_trip_pk_to_path_in_system took {:.2} seconds".
format(time.time() - start_time))
return trip_pk_to_stop_pks
def sync(self, parsed_transfers: typing.Iterable[parse.Transfer]):
parsed_transfers = list(parsed_transfers)
# TODO use the query to speed it up:
# stopqueries.delete_transfers_in_system(self.feed_update.feed.system.pk)
stop_ids = set()
for transfer in parsed_transfers:
stop_ids.add(transfer.from_stop_id)
stop_ids.add(transfer.to_stop_id)
stop_id_to_pk = stopqueries.get_id_to_pk_map_in_system(
self.feed_update.feed.system.pk, stop_ids)
session = dbconnection.get_session()
num_added = 0
for transfer in parsed_transfers:
from_stop_pk = stop_id_to_pk.get(transfer.from_stop_id)
to_stop_pk = stop_id_to_pk.get(transfer.to_stop_id)
if from_stop_pk is None or to_stop_pk is None:
continue
db_transfer = models.Transfer.from_parsed_transfer(transfer)
db_transfer.system_pk = self.feed_update.feed.system.pk
db_transfer.source_pk = self.feed_update.pk
db_transfer.from_stop_pk = from_stop_pk
db_transfer.to_stop_pk = to_stop_pk
session.add(db_transfer)
num_added += 1
return num_added, 0
def _save_feed_configuration(system, feeds_config):
"""
Save feeds in a system.
Stale feed maps -- those that are currently attached to the system but that
do not correspond to entries in the config -- are *not* deleted by this method.
:param system: the system to save the service maps in
:param feeds_config: the feeds config JSON blob
:return: a two-tuple of feed ID collections; the first collection contains IDs for
feeds that need to be updated and the second for feeds that need to be deleted
"""
feed_id_to_pk = genericqueries.get_id_to_pk_map(models.Feed, system.pk)
session = dbconnection.get_session()
feed_ids_to_update = list()
for feed in _build_feeds_from_config(feeds_config):
feed.system_pk = system.pk
if feed.id in feed_id_to_pk:
feed.pk = feed_id_to_pk[feed.id]
del feed_id_to_pk[feed.id]
logger.info("Updating feed {}/{}".format(system.id, feed.id))
else:
logger.info("Creating feed {}/{}".format(system.id, feed.id))
session.merge(feed)
if not feed.required_for_install:
continue
feed_ids_to_update.append(feed.id)
feed_ids_to_delete = list(feed_id_to_pk.keys())
return feed_ids_to_update, feed_ids_to_delete
def list_all_stops_in_stop_tree(stop_pk) -> typing.Iterable[models.Stop]:
"""
List all stops in the stop tree of a given stop.
"""
session = dbconnection.get_session()
# The first CTE retrieves all stop PKs of ancestors of the root stop.
ancestor_cte = (session.query(
models.Stop.pk,
models.Stop.parent_stop_pk).filter(models.Stop.pk == stop_pk).cte(
name="ancestor", recursive=True))
ancestor_cte = ancestor_cte.union_all(
session.query(models.Stop.pk, models.Stop.parent_stop_pk).filter(
models.Stop.pk == ancestor_cte.c.parent_stop_pk))
# The second CTE then retrieves all descendents of all stops from the first CTE.
# Because the first CTE returns the root of the stops tree, the second CTE returns
# all stops in the tree.
relation_cte = (session.query(
models.Stop.pk, models.Stop.parent_stop_pk).filter(
models.Stop.pk == ancestor_cte.c.pk).cte(name="relation",
recursive=True))
relation_cte = relation_cte.union_all(
session.query(models.Stop.pk, models.Stop.parent_stop_pk).filter(
models.Stop.parent_stop_pk == relation_cte.c.pk))
query = session.query(
models.Stop).filter(models.Stop.pk == relation_cte.c.pk)
return query.all()
def get_trip_pk_to_stop_time_data(
trip_pk_stop_pk_stop_sequence_tuples, ) -> typing.Dict[int, StopTimeData]:
session = dbconnection.get_session()
conditions = []
for trip_pk, stop_pk, stop_sequence in trip_pk_stop_pk_stop_sequence_tuples:
if stop_sequence is None and stop_pk is None:
continue
sub_conditions = [models.TripStopTime.trip_pk == trip_pk]
if stop_pk is not None:
sub_conditions.append(models.TripStopTime.stop_pk == stop_pk)
if stop_sequence is not None:
sub_conditions.append(
models.TripStopTime.stop_sequence == stop_sequence)
conditions.append(sql.and_(*sub_conditions))
if len(conditions) == 0:
return {}
query = session.query(
models.TripStopTime.trip_pk,
models.TripStopTime.pk,
models.TripStopTime.stop_sequence,
models.TripStopTime.stop_pk,
).filter(sql.or_(*conditions))
result = {}
for (trip_pk, stop_time_pk, stop_sequence, stop_pk) in query.all():
result[trip_pk] = StopTimeData(pk=stop_time_pk,
stop_sequence=stop_sequence,
stop_pk=stop_pk)
return result
def list_in_system(DbEntity: models.Base,
system_id,
order_by_field=None,
ids=None):
"""
List all entities of a certain type that are in a given system. Note this method
only works with entities that are direct children of the system.
:param DbEntity: the entity's type
:param system_id: the system's ID
:param order_by_field: optional field to order the results by
:param ids: ids to filter on
:return: list of entities of type DbEntity
"""
if ids is not None and len(ids) == 0:
return []
session = dbconnection.get_session()
query = (session.query(DbEntity).filter(
DbEntity.system_pk == models.System.pk).filter(
models.System.id == system_id))
if ids is not None:
query = query.filter(DbEntity.id.in_(ids))
if order_by_field is not None:
query = query.order_by(order_by_field)
return query.all()
def build_stop_pk_to_descendant_pks_map(stop_pks,
stations_only=False
) -> typing.Dict[int, typing.Set[int]]:
"""
Construct a map whose key is a stop's pk and value is a list of all stop pks
that are descendents of that stop.
"""
session = dbconnection.get_session()
descendant_cte = (session.query(
models.Stop.pk.label("ancestor_pk"),
models.Stop.pk.label("descendent_pk")).filter(
models.Stop.pk.in_(stop_pks)).cte(name="descendent_cte",
recursive=True))
recursive_part = session.query(
descendant_cte.c.ancestor_pk.label("ancestor_pk"),
models.Stop.pk.label("descendent_pk"),
).filter(models.Stop.parent_stop_pk == descendant_cte.c.descendent_pk)
if stations_only:
recursive_part = recursive_part.filter(
models.Stop.type.in_(models.Stop.STATION_TYPES))
descendant_cte = descendant_cte.union_all(recursive_part)
stop_pk_to_descendant_pks = collections.defaultdict(set)
for stop_pk, descendant_pk in session.query(descendant_cte).all():
stop_pk_to_descendant_pks[stop_pk].add(descendant_pk)
return dict(stop_pk_to_descendant_pks)
def get_update_by_pk(feed_update_pk) -> Optional[models.FeedUpdate]:
session = dbconnection.get_session()
return (session.query(models.FeedUpdate).filter(
models.FeedUpdate.pk == feed_update_pk).options(
joinedload(models.FeedUpdate.feed)).options(
joinedload(models.FeedUpdate.feed,
models.Feed.system)).one_or_none())
def list_aggregated_updates(feed_pks, start_time):
session = dbconnection.get_session()
query = (session.query(
models.FeedUpdate.feed_pk,
func.count(models.FeedUpdate.status),
models.FeedUpdate.status,
models.FeedUpdate.result,
func.min(models.FeedUpdate.completed_at),
func.max(models.FeedUpdate.completed_at),
).group_by(
models.FeedUpdate.feed_pk,
models.FeedUpdate.status,
models.FeedUpdate.result,
).filter(
models.FeedUpdate.feed_pk.in_(feed_pks),
models.FeedUpdate.completed_at > start_time,
models.FeedUpdate.status.in_({
models.FeedUpdate.Status.SUCCESS, models.FeedUpdate.Status.FAILURE
}),
))
feed_pk_to_updates = {}
for row in query.all():
if row[0] not in feed_pk_to_updates:
feed_pk_to_updates[row[0]] = []
feed_pk_to_updates[row[0]].append(row[1:])
return feed_pk_to_updates
def list_all():
return (
dbconnection.get_session()
.query(models.TransfersConfig)
.options(selectinload(models.TransfersConfig.systems))
.all()
)
def list_stale_entities(DbEntity: typing.Type[models.Base],
feed_update: models.FeedUpdate):
session = dbconnection.get_session()
query = (session.query(DbEntity).join(
models.FeedUpdate, DbEntity.source_pk == models.FeedUpdate.pk).filter(
models.FeedUpdate.feed_pk == feed_update.feed_pk).filter(
models.FeedUpdate.pk != feed_update.pk))
return query.all()
def delete_stale_entities(DbEntity: typing.Type[models.Base],
feed_update: models.FeedUpdate):
session = dbconnection.get_session()
(session.query(DbEntity).filter(
DbEntity.source_pk == models.FeedUpdate.pk).filter(
models.FeedUpdate.feed_pk == feed_update.feed_pk).filter(
models.FeedUpdate.pk != feed_update.pk)).delete(
synchronize_session=False)
def list_by_system_and_trip_ids(system_id, trip_ids):
trip_ids = list(trip_ids)
if len(trip_ids) == 0:
return []
return (dbconnection.get_session().query(models.Trip).join(
models.Route).filter(models.Trip.id.in_(trip_ids)).filter(
models.Route.system_pk == models.System.pk).filter(
models.System.id == system_id).all())
def get_id_to_pk_map_by_feed_pk(DbEntity: typing.Type[models.Base], feed_pk):
id_to_pk = {}
session = dbconnection.get_session()
query = (session.query(DbEntity.id, DbEntity.pk).join(
models.FeedUpdate, DbEntity.source_pk == models.FeedUpdate.pk).filter(
models.FeedUpdate.feed_pk == feed_pk))
for (id_, pk) in query.all():
id_to_pk[id_] = pk
return id_to_pk
def create(system_ids, distance) -> str:
systems = _list_systems(system_ids)
transfers_config = models.TransfersConfig(distance=distance,
systems=systems)
_build_and_add_transfers(transfers_config)
session = dbconnection.get_session()
session.add(transfers_config)
session.flush()
return transfers_config.id
def list_all_active():
"""
List all feeds in active systems.
"""
session = dbconnection.get_session()
query = (session.query(models.Feed).join(
models.System, models.System.pk == models.Feed.system_pk).filter(
models.System.status == models.System.SystemStatus.ACTIVE))
return query.all()
def get_by_id(DbEntity: models.Base, id_):
"""
Get an entity by its ID.
:param DbEntity: the entity's type
:param id_: the entity's ID
:return: the entity, if it exists in the DB, or None otherwise
"""
session = dbconnection.get_session()
return session.query(DbEntity).filter(DbEntity.id == id_).one_or_none()
def get_id_to_pk_map_in_system(system_pk, trip_ids):
trip_ids = list(trip_ids)
if len(trip_ids) == 0:
return {}
id_to_pk = {id_: None for id_ in trip_ids}
for id_, pk in (dbconnection.get_session().query(
models.Trip.id, models.Trip.pk).join(models.Route).filter(
models.Trip.id.in_(trip_ids)).filter(
models.Route.system_pk == system_pk).all()):
id_to_pk[id_] = pk
return id_to_pk
def count_number_of_related_entities(relationship, instance) -> int:
"""
Count the number of entities related to an instance along a specified relationship.
"""
base_type = relationship.class_
related_type = relationship.mapper.class_
session = dbconnection.get_session()
query = (session.query(func.count(1)).select_from(base_type).join(
related_type,
relationship).filter(getattr(base_type, "pk") == instance.pk))
return query.one()[0]
def trim_feed_updates(feed_pk, before_datetime):
"""
Trip all FeedUpdates for a feed whose last action time was before
a certain cut-off point.
:param feed_pk: pk of the feed
:param before_datetime: the cut-off point
"""
not_exists_conditions = [
~sql.exists(
sql.select(1).where(
UpdatableEntity.source_pk == models.FeedUpdate.pk))
for UpdatableEntity in models.list_updatable_entities()
]
query = (sql.delete(models.FeedUpdate).where(
sql.and_(models.FeedUpdate.feed_pk == feed_pk,
models.FeedUpdate.completed_at <= before_datetime,
*not_exists_conditions)).execution_options(
synchronize_session=False))
dbconnection.get_session().execute(query)
def get_trip_id_to_pk_map_by_feed_pk(feed_pk):
id_to_pk = {}
query = (dbconnection.get_session().query(
models.ScheduledTrip.id, models.ScheduledTrip.pk).filter(
models.ScheduledService.pk == models.ScheduledTrip.service_pk,
models.ScheduledService.source_pk == models.FeedUpdate.pk,
models.FeedUpdate.feed_pk == feed_pk,
))
for (id_, pk) in query.all():
id_to_pk[id_] = pk
return id_to_pk
def list_updates_in_feed(feed_pk):
"""
List the most recent updates in a feed, ordered descending in time.
:param feed_pk: the Feed's PK
:return: list of FeedUpdates
"""
session = dbconnection.get_session()
query = (session.query(models.FeedUpdate).filter(
models.FeedUpdate.feed_pk == feed_pk).order_by(
models.FeedUpdate.pk.desc()).limit(100))
return query.all()
def list_all_in_route_by_pk(route_pk):
"""
List all of the Trips in a route.
:param route_pk: the route's PK
:return: list of Trips
"""
session = dbconnection.get_session()
query = (session.query(
models.Trip).filter(models.Trip.route_pk == route_pk).options(
selectinload(models.Trip.stop_times)))
return query.all()
def list_all_auto_updating():
"""
List all auto-updating Feeds.
:return: list of Feeds
"""
session = dbconnection.get_session()
query = (session.query(models.Feed).join(
models.System, models.System.pk == models.Feed.system_pk).filter(
models.Feed.auto_update_enabled).filter(
models.System.auto_update_enabled).filter(
models.System.status == models.System.SystemStatus.ACTIVE))
return query.all()
