def _load_tree_from_file(self, filepath: Path) -> StructuredDataNode:
try:
tree = _filter_tree(StructuredDataStore.load_file(filepath))
except FileNotFoundError:
raise LoadStructuredDataError()
if tree is None or tree.is_empty():
# load_file may return an empty tree
raise LoadStructuredDataError()
return tree
def get_tree(timestamp: Optional[str]) -> StructuredDataNode:
if timestamp is None:
return StructuredDataNode()
if timestamp in tree_lookup:
return tree_lookup[timestamp]
if timestamp == latest_timestamp:
inventory_tree = load_filtered_inventory_tree(hostname)
if inventory_tree is None:
raise LoadStructuredDataError()
tree_lookup[timestamp] = inventory_tree
else:
inventory_archive_path = Path(inventory_archive_dir, timestamp)
tree_lookup[timestamp] = _filter_tree(
StructuredDataStore.load_file(inventory_archive_path))
return tree_lookup[timestamp]