def OpenLogCollection(self, logs_collection_urn):
"""Open the parent-flow logs collection for writing or create a new one.
If we receive a logs_collection_urn here it is being passed from the parent
flow runner into the new runner created by the flow object.
For a regular flow the call sequence is:
flow_runner --StartFlow--> flow object --CreateRunner--> (new) flow_runner
For a hunt the call sequence is:
hunt_runner --CallFlow--> flow_runner --StartFlow--> flow object
--CreateRunner--> (new) flow_runner
Args:
logs_collection_urn: RDFURN pointing to parent logs collection
Returns:
The LogCollection.
Raises:
ValueError: on parent missing logs_collection.
"""
return grr_collections.LogCollection(
self._GetLogCollectionURN(logs_collection_urn))
def LogCollectionForFID(cls, flow_id):
return grr_collections.LogCollection(flow_id.Add(LOGS_SUFFIX))