def test_data_block_methods():
env = make_test_env()
db = DataBlockMetadata(
id=get_datablock_id(),
inferred_schema_key="_test.TestSchema1",
nominal_schema_key="_test.TestSchema2",
realized_schema_key="_test.TestSchema3",
)
strg = env.get_default_local_python_storage()
records = [{"a": 1}]
mdr = as_records(records)
sdb = StoredDataBlockMetadata(
id=get_datablock_id(),
data_block_id=db.id,
data_block=db,
storage_url=strg.url,
data_format=RecordsFormat,
)
with env.session_scope() as sess:
sess.add(db)
sess.add(sdb)
assert sdb.name is None
name = sdb.get_name()
assert len(name) > 10
assert sdb.name == name
strg.get_api().put(sdb.name, mdr)
assert db.inferred_schema(env, sess) == TestSchema1
assert db.nominal_schema(env, sess) == TestSchema2
assert db.realized_schema(env, sess) == TestSchema3
db.compute_record_count()
assert db.record_count == 1
def convert_sdb(
env: Environment,
sess: Session,
sdb: StoredDataBlockMetadata,
conversion_path: ConversionPath,
target_storage: Storage,
storages: Optional[List[Storage]] = None,
) -> StoredDataBlockMetadata:
if not conversion_path.conversions:
return sdb
if storages is None:
storages = env.storages
prev_sdb = sdb
next_sdb: Optional[StoredDataBlockMetadata] = None
prev_storage = sdb.storage
next_storage: Optional[Storage] = None
realized_schema = sdb.realized_schema(env, sess)
for conversion_edge in conversion_path.conversions:
conversion = conversion_edge.conversion
target_storage_format = conversion.to_storage_format
next_storage = select_storage(target_storage, storages,
target_storage_format)
logger.debug(
f"CONVERSION: {conversion.from_storage_format} -> {conversion.to_storage_format}"
)
next_sdb = StoredDataBlockMetadata( # type: ignore
id=get_datablock_id(),
data_block_id=prev_sdb.data_block_id,
data_block=prev_sdb.data_block,
data_format=target_storage_format.data_format,
storage_url=next_storage.url,
)
sess.add(next_sdb)
conversion_edge.copier.copy(
from_name=prev_sdb.get_name(),
to_name=next_sdb.get_name(),
conversion=conversion,
from_storage_api=prev_storage.get_api(),
to_storage_api=next_storage.get_api(),
schema=realized_schema,
)
if (prev_sdb.data_format.is_python_format()
and not prev_sdb.data_format.is_storable()):
# If the records obj is in python and not storable, and we just used it, then it can be reused
# TODO: Bit of a hack. Is there a central place we can do this?
# also is reusable a better name than storable?
prev_storage.get_api().remove(prev_sdb.get_name())
prev_sdb.data_block.stored_data_blocks.remove(prev_sdb)
if prev_sdb in sess.new:
sess.expunge(prev_sdb)
else:
sess.delete(prev_sdb)
prev_sdb = next_sdb
prev_storage = next_storage
return next_sdb