def get_all_events(self):
"""
Get all events up to latest version
"""
return Event.query(
self.aggregate.aggregate_name,
aggregate_id__begins_with=self.aggregate.aggregate_id
)
def get_events(self, version):
"""
Get all events up to specific version
"""
return Event.query(
self.aggregate.aggregate_name,
aggregate_id__le='%s:%s' % (
self.aggregate.aggregate_id, version
)
)
def get_last_event(self):
events = list(Event.query(
self.aggregate.aggregate_name,
aggregate_id__begins_with=self.aggregate.aggregate_id,
limit=1, scan_index_forward=False
))
try:
return events[0]
except IndexError:
raise AggregateDoesNotExist()
def persist(self, aggregate_id, event_type, attrs):
"""Persist event in dynamodb."""
event = Event(
aggregate_name=self.aggregate.aggregate_name,
aggregate_id=aggregate_id,
event_type=event_type,
created_at=datetime.utcnow(),
event_data=attrs
)
try:
event.save(
aggregate_name__ne=event.aggregate_name,
aggregate_id__ne=event.aggregate_id,
conditional_operator='and'
)
except PutError:
raise IntegrityError(errors={
'aggregate_name': event.aggregate_name,
'aggregate_id': event.aggregate_id,
})
return event
def setUp(self):
Event.create_table(
read_capacity_units=1, write_capacity_units=1
)
self.item = Item()
def tearDown(self):
Event.delete_table()