def buy_asset(): """ Requires all ocean services running. """ ConfigProvider.set_config(ExampleConfig.get_config()) config = ConfigProvider.get_config() # make ocean instance ocn = Ocean() acc = get_publisher_account(config) if not acc: acc = ([acc for acc in ocn.accounts.list() if acc.password] or ocn.accounts.list())[0] # Register ddo ddo = ocn.assets.create(Metadata.get_example(), acc, providers=[acc.address]) logging.info(f'registered ddo: {ddo.did}') # ocn here will be used only to publish the asset. Handling the asset by the publisher # will be performed by the Brizo server running locally keeper = Keeper.get_instance() if 'TEST_LOCAL_NILE' in os.environ and os.environ['TEST_LOCAL_NILE'] == '1': provider = keeper.did_registry.to_checksum_address( '0x413c9ba0a05b8a600899b41b0c62dd661e689354' ) keeper.did_registry.add_provider(ddo.asset_id, provider, acc) logging.debug(f'is did provider: ' f'{keeper.did_registry.is_did_provider(ddo.asset_id, provider)}') cons_ocn = Ocean() consumer_account = get_account_from_config(config, 'parity.address1', 'parity.password1') # sign agreement using the registered asset did above service = ddo.get_service(service_type=ServiceTypes.ASSET_ACCESS) # This will send the purchase request to Brizo which in turn will execute the agreement on-chain cons_ocn.accounts.request_tokens(consumer_account, 100) sa = ServiceAgreement.from_service_dict(service.as_dictionary()) agreement_id = cons_ocn.assets.order( ddo.did, sa.service_definition_id, consumer_account) logging.info('placed order: %s, %s', ddo.did, agreement_id) i = 0 while ocn.agreements.is_access_granted( agreement_id, ddo.did, consumer_account.address) is not True and i < 30: time.sleep(1) i += 1 assert ocn.agreements.is_access_granted(agreement_id, ddo.did, consumer_account.address) ocn.assets.consume( agreement_id, ddo.did, sa.service_definition_id, consumer_account, config.downloads_path) logging.info('Success buying asset.')