@lyricnz I noticed that the spanner lib has provided low layer asyncio services client, so I implemented and tested an easy wrapped for asyncio, but it is the code for my company so I could not open source before permission.
You could use the low layer services like this to do async rpc request:

from google.cloud import spanner_v1
_client = spanner_v1.services.spanner.SpannerAsyncClient()
name_project = f'projects/{project}'
name_instance = f'{name_project}/instances/{instance}'
name_database = f'{name_instance}/databases/{database}'
session = await _client.create_session(database=name_database)
request = spanner_v1.ReadRequest(
        session=session.name,
        table="tb_test_types",
        columns=['id', 'data_num'],
        key_set=spanner_v1.keyset.KeySet(all_=True)._to_pb()
)
response = await _client.read(request=request)
print(type(response))
print(response)

To wrap the lower layer, you need to implement session pool and management, transaction management, and AsyncStreamedResultSet.

AsyncIO support for google-cloud-compute #1864

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