Adding a Dataset Record Asynchronously

add_string_dataset_record_async.py

This sample creates a dataset comprising string records if one does not exist and adds a record to the dataset. The sample uses async methods to commit a dataset and records and illustrates async operation using asyncio.

Summary

A set is a collection of objects. A named set of data records is a dataset. Such datasets can implement any point-in-time (PIT) or bitemporal data and prove this provenance to third parties. The sample demonstrates the higher-order async vBase dataset and string record abstractions that hide the details of the object and record content id (CID) calculation (hashing). This example builds on the add_string_dataset_record.py code and illustrates async methods.

Detailed Description:

• Create a vBase object using a Web3 HTTP commitment service. The commitment service is a smart contract running on a blockchain. The initialization uses connection parameters specified in environment variables:

  vbc = VBaseClient.create_instance_from_env()

• Create the test dataset asynchronously. This factory method constructs a VBaseDatasetAsync object using the asyncio event loop. Arguments and mechanics are similar to those of VBaseDataset object creation.

  VBaseDatasetAsync.create(vbc, name=SET_NAME, record_type=VBaseStringObject)

• Add string record to the dataset asynchronously. This method makes an object commitment using the asyncio event loop. Arguments and mechanics are similar to those of ds.add_record() call:

  ds.add_record_async("TestRecord")

• Verify that a given set commitment exists for a given user. This will typically be called by the data consumer to verify a producer's claims about dataset provenance:

  assert ds.verify_commitments()[0]