def _handle_for_status(self, event_record: DataRecord) -> Optional[Dict[Any, Any]]:
"""
Take appropriate action based on event_record's status
Parameters
----------
event_record: DataRecord
Returns
-------
Optional[Dict[Any, Any]
Lambda response previously used for this idempotency key, if it has successfully executed already.
Raises
------
AlreadyInProgressError
A lambda execution is already in progress
IdempotencyInconsistentStateError
The persistence store reports inconsistent states across different requests. Retryable.
"""
# This code path will only be triggered if the record becomes expired between the save_inprogress call and here
if event_record.status == STATUS_CONSTANTS["EXPIRED"]:
raise IdempotencyInconsistentStateError("save_inprogress and get_record return inconsistent results.")
if event_record.status == STATUS_CONSTANTS["INPROGRESS"]:
raise IdempotencyAlreadyInProgressError(
f"Execution already in progress with idempotency key: "
f"{self.persistence_store.event_key_jmespath}={event_record.idempotency_key}"
)
return event_record.response_json_as_dict()
def test_in_progress_never_saved_to_cache(
idempotency_config: IdempotencyConfig,
persistence_store: DynamoDBPersistenceLayer):
# GIVEN a data record with status "INPROGRESS"
# and persistence_store has use_local_cache = True
persistence_store.configure(idempotency_config)
data_record = DataRecord("key", status="INPROGRESS")
# WHEN saving to local cache
persistence_store._save_to_cache(data_record)
# THEN don't save to local cache
assert persistence_store._cache.get("key") is None
def test_user_local_disabled(idempotency_config: IdempotencyConfig, persistence_store: DynamoDBPersistenceLayer):
# GIVEN a persistence_store with use_local_cache = False
persistence_store.configure(idempotency_config)
# WHEN calling any local cache options
data_record = DataRecord("key", status="COMPLETED")
try:
persistence_store._save_to_cache(data_record)
cache_value = persistence_store._retrieve_from_cache("key")
assert cache_value is None
persistence_store._delete_from_cache("key")
except AttributeError as e:
pytest.fail(f"AttributeError should not be raised: {e}")
# THEN raise AttributeError
# AND don't have a _cache attribute
assert not hasattr("persistence_store", "_cache")
def _item_to_data_record(self, item: Dict[str, Any]) -> DataRecord:
"""
Translate raw item records from DynamoDB to DataRecord
Parameters
----------
item: Dict[str, Union[str, int]]
Item format from dynamodb response
Returns
-------
DataRecord
representation of item
"""
return DataRecord(
idempotency_key=item[self.key_attr],
status=item[self.status_attr],
expiry_timestamp=item[self.expiry_attr],
response_data=item.get(self.data_attr),
payload_hash=item.get(self.validation_key_attr),
)
def test_data_record_invalid_status_value():
data_record = DataRecord("key", status="UNSUPPORTED_STATUS")
with pytest.raises(IdempotencyInvalidStatusError) as e:
_ = data_record.status
assert e.value.args[0] == "UNSUPPORTED_STATUS"
