def test_get_token_address_fails(web3, dtfactory_address):
"""Tests the failure case for get_token_address."""
dtfactory = DTFactory(web3, dtfactory_address)
# Transaction 0x is not in the chain
with pytest.raises(TimeExhausted):
with patch("ocean_lib.models.dtfactory.DTFactory.get_tx_receipt") as mock:
# throw the exception without acually waiting
mock.side_effect = TimeExhausted()
# we are checking that this exception bubbles up to get_token_address()
dtfactory.get_token_address("")
def _deployAndMintToken(symbol: str, to_address: str) -> btoken.BToken:
wallet = get_factory_deployer_wallet(_NETWORK)
dt_address = DataToken.deploy(
wallet.web3,
wallet,
None,
"Template Contract",
"TEMPLATE",
wallet.address,
to_base_18(1000),
DTFactory.FIRST_BLOB,
to_address,
)
dt_factory = DTFactory(
DTFactory.deploy(wallet.web3, wallet, None, dt_address, to_address)
)
token_address = dt_factory.get_token_address(
dt_factory.createToken(
symbol, symbol, symbol, DataToken.DEFAULT_CAP_BASE, wallet
)
)
token = DataToken(token_address)
token.mint(to_address, to_base_18(1000), wallet)
return btoken.BToken(token.address)
def test_get_token_minter(web3, alice_wallet, dtfactory_address, alice_address):
"""Tests proper retrieval of token minter from DTFactory."""
dtfactory = DTFactory(web3, dtfactory_address)
dt_address = dtfactory.createToken(
"foo_blob", "DT1", "DT1", to_wei(1000), from_wallet=alice_wallet
)
dt = DataToken(web3, dtfactory.get_token_address(dt_address))
dt.mint(alice_address, to_wei(10), from_wallet=alice_wallet)
assert dtfactory.get_token_minter(dt.address) == alice_address
def test1(network, alice_wallet, dtfactory_address):
dtfactory = DTFactory(dtfactory_address)
dt_address = dtfactory.createToken("foo_blob",
"DT1",
"DT1",
to_base_18(1000),
from_wallet=alice_wallet)
dt = DataToken(dtfactory.get_token_address(dt_address))
assert isinstance(dt, DataToken)
assert dt.blob() == "foo_blob"
def test_data_token_creation(web3, alice_wallet, dtfactory_address):
"""Tests that a data token can be created using a DTFactory object."""
dtfactory = DTFactory(web3, dtfactory_address)
dt_address = dtfactory.createToken(
"foo_blob", "DT1", "DT1", to_wei(1000), from_wallet=alice_wallet
)
dt = DataToken(web3, dtfactory.get_token_address(dt_address))
assert isinstance(dt, DataToken)
assert dt.blob() == "foo_blob"
assert dtfactory.verify_data_token(dt.address)
def test_data_token_event_registered(alice_wallet, dtfactory_address, alice_ocean):
"""Tests that a token registration event is created and can be retrieved."""
dtfactory = DTFactory(dtfactory_address)
dt_address = dtfactory.createToken(
"foo_blob", "DT1", "DT1", to_base_18(1000.0), from_wallet=alice_wallet
)
dt = DataToken(dtfactory.get_token_address(dt_address))
block = alice_ocean.web3.eth.blockNumber
# with explicit address
registered_event = dtfactory.get_token_registered_event(
block - 1, block + 1, token_address=dt.address
)
assert registered_event.args.tokenAddress == dt.address
def test_data_token_event_registered(
web3, alice_wallet, dtfactory_address, alice_ocean
):
"""Tests that a token registration event is created and can be retrieved."""
dtfactory = DTFactory(web3, dtfactory_address)
dt_address = dtfactory.createToken(
"foo_blob", "DT1", "DT1", to_wei(1000), from_wallet=alice_wallet
)
dt = DataToken(web3, dtfactory.get_token_address(dt_address))
block = alice_ocean.web3.eth.block_number
# with explicit address
block_confirmations = alice_ocean.config.block_confirmations.value
registered_event = dtfactory.get_token_registered_event(
block - (block_confirmations + 1), block, token_address=dt.address
)
assert registered_event.args.tokenAddress == dt.address
def create(
self,
metadata: dict,
publisher_wallet: Wallet,
service_descriptors: list = None,
owner_address: str = None,
data_token_address: str = None,
provider_uri=None,
dt_name: str = None,
dt_symbol: str = None,
dt_blob: str = None,
dt_cap: float = None,
) -> (Asset, None):
"""
Register an asset on-chain by creating/deploying a DataToken contract
and in the Metadata store (Aquarius).
:param metadata: dict conforming to the Metadata accepted by Ocean Protocol.
:param publisher_wallet: Wallet of the publisher registering this asset
:param service_descriptors: list of ServiceDescriptor tuples of length 2.
The first item must be one of ServiceTypes and the second
item is a dict of parameters and values required by the service
:param owner_address: hex str the ethereum address to assign asset ownership to. After
registering the asset on-chain, the ownership is transferred to this address
:param data_token_address: hex str the address of the data token smart contract. The new
asset will be associated with this data token address.
:param provider_uri: str URL of service provider. This will be used as base to
construct the serviceEndpoint for the `access` (download) service
:param dt_name: str name of DataToken if creating a new one
:param dt_symbol: str symbol of DataToken if creating a new one
:param dt_blob: str blob of DataToken if creating a new one. A `blob` is any text
to be stored with the ERC20 DataToken contract for any purpose.
:param dt_cap: float
:return: DDO instance
"""
assert isinstance(
metadata,
dict), f"Expected metadata of type dict, got {type(metadata)}"
assert service_descriptors is None or isinstance(
service_descriptors, list
), f"bad type of `service_descriptors` {type(service_descriptors)}"
# copy metadata so we don't change the original
metadata_copy = copy.deepcopy(metadata)
asset_type = metadata_copy["main"]["type"]
assert asset_type in (
"dataset",
"algorithm",
), f"Invalid/unsupported asset type {asset_type}"
if not plecos.is_valid_dict_local(metadata_copy):
errors = plecos.list_errors_dict_local(metadata_copy)
msg = f"Metadata has validation errors: {errors}"
logger.error(msg)
raise ValueError(msg)
service_descriptors = service_descriptors or []
services = self._process_service_descriptors(service_descriptors,
metadata_copy,
provider_uri,
publisher_wallet)
stype_to_service = {s.type: s for s in services}
checksum_dict = dict()
for service in services:
checksum_dict[str(service.index)] = checksum(service.main)
# Create a DDO object
asset = Asset()
# Adding proof to the ddo.
asset.add_proof(checksum_dict, publisher_wallet)
#################
# DataToken
address = DTFactory.configured_address(Web3Helper.get_network_name(),
self._config.address_file)
dtfactory = DTFactory(address)
if not data_token_address:
blob = dt_blob or ""
name = dt_name or metadata["main"]["name"]
symbol = dt_symbol or name
# register on-chain
_cap = dt_cap if dt_cap else DataToken.DEFAULT_CAP
tx_id = dtfactory.createToken(blob,
name,
symbol,
to_base_18(_cap),
from_wallet=publisher_wallet)
data_token = DataToken(dtfactory.get_token_address(tx_id))
if not data_token:
logger.warning("Creating new data token failed.")
return None
data_token_address = data_token.address
logger.info(f"Successfully created data token with address "
f"{data_token.address} for new dataset asset.")
# owner_address is set as minter only if creating new data token. So if
# `data_token_address` is set `owner_address` has no effect.
if owner_address:
data_token.proposeMinter(owner_address,
from_wallet=publisher_wallet)
else:
# verify data_token_address
dt = DataToken(data_token_address)
minter = dt.contract_concise.minter()
if not minter:
raise AssertionError(
f"datatoken address {data_token_address} does not seem to be a valid DataToken contract."
)
elif minter.lower() != publisher_wallet.address.lower():
raise AssertionError(
f"Minter of datatoken {data_token_address} is not the same as the publisher."
)
elif not dtfactory.verify_data_token(data_token_address):
raise AssertionError(
f"datatoken address {data_token_address} is not found in the DTFactory events."
)
assert (
data_token_address
), "data_token_address is required for publishing a dataset asset."
# Generating the did and adding to the ddo.
did = asset.assign_did(
f"did:op:{remove_0x_prefix(data_token_address)}")
logger.debug(f"Using datatoken address as did: {did}")
# Check if it's already registered first!
if did in self._get_aquarius().list_assets():
raise OceanDIDAlreadyExist(
f"Asset id {did} is already registered to another asset.")
md_service = stype_to_service[ServiceTypes.METADATA]
ddo_service_endpoint = md_service.service_endpoint
if "{did}" in ddo_service_endpoint:
ddo_service_endpoint = ddo_service_endpoint.replace("{did}", did)
md_service.set_service_endpoint(ddo_service_endpoint)
# Populate the ddo services
asset.add_service(md_service)
access_service = stype_to_service.get(ServiceTypes.ASSET_ACCESS, None)
compute_service = stype_to_service.get(ServiceTypes.CLOUD_COMPUTE,
None)
if access_service:
asset.add_service(access_service)
if compute_service:
asset.add_service(compute_service)
asset.proof["signatureValue"] = Web3Helper.sign_hash(
add_ethereum_prefix_and_hash_msg(asset.asset_id), publisher_wallet)
# Add public key and authentication
asset.add_public_key(did, publisher_wallet.address)
asset.add_authentication(did, PUBLIC_KEY_TYPE_RSA)
# Setup metadata service
# First compute files_encrypted
assert metadata_copy["main"][
"files"], "files is required in the metadata main attributes."
logger.debug("Encrypting content urls in the metadata.")
publisher_signature = self._data_provider.sign_message(
publisher_wallet, asset.asset_id, self._config)
_, encrypt_endpoint = self._data_provider.build_encrypt_endpoint(
provider_uri)
files_encrypted = self._data_provider.encrypt_files_dict(
metadata_copy["main"]["files"],
encrypt_endpoint,
asset.asset_id,
publisher_wallet.address,
publisher_signature,
)
# only assign if the encryption worked
if files_encrypted:
logger.debug(
f"Content urls encrypted successfully {files_encrypted}")
index = 0
for file in metadata_copy["main"]["files"]:
file["index"] = index
index = index + 1
del file["url"]
metadata_copy["encryptedFiles"] = files_encrypted
else:
raise AssertionError("Encrypting the files failed.")
logger.debug(f"Generated asset and services, DID is {asset.did},"
f" metadata service @{ddo_service_endpoint}.")
# Set datatoken address in the asset
asset.data_token_address = data_token_address
try:
# publish the new ddo in ocean-db/Aquarius
ddo_registry = self.ddo_registry()
web3 = Web3Provider.get_web3()
tx_id = ddo_registry.create(
asset.asset_id,
bytes([1]),
lzma.compress(web3.toBytes(text=asset.as_text())),
publisher_wallet,
)
if not ddo_registry.verify_tx(tx_id):
raise AssertionError(
f"create DDO on-chain failed, transaction status is 0. Transaction hash is {tx_id}"
)
logger.info("Asset/ddo published on-chain successfully.")
except ValueError as ve:
raise ValueError(
f"Invalid value to publish in the metadata: {str(ve)}")
except Exception as e:
logger.error(f"Publish asset on-chain failed: {str(e)}")
raise
return asset
def get_registered_ddo(client, wallet, metadata, service_descriptor):
aqua = Aquarius('http://localhost:5000')
ddo_service_endpoint = aqua.get_service_endpoint()
metadata_store_url = json.dumps({'t': 1, 'url': ddo_service_endpoint})
# Create new data token contract
addresses = get_contracts_addresses(get_address_file())
dt_address = addresses.get(DTFactory.CONTRACT_NAME)
if dt_address:
factory_contract = DTFactory(dt_address)
else:
factory_contract = new_factory_contract()
ddo_contract_address = addresses.get(MetadataContract.CONTRACT_NAME)
metadata_contract = MetadataContract(ddo_contract_address)
tx_id = factory_contract.createToken(metadata_store_url, 'DataToken1',
'DT1', to_base_18(1000000), wallet)
dt_contract = DataToken(factory_contract.get_token_address(tx_id))
if not dt_contract:
raise AssertionError('Creation of data token contract failed.')
ddo = Asset()
ddo.data_token_address = dt_contract.address
metadata_service_desc = ServiceDescriptor.metadata_service_descriptor(
metadata, ddo_service_endpoint)
service_descriptors = list([
ServiceDescriptor.authorization_service_descriptor(
'http://localhost:12001')
])
service_descriptors.append(service_descriptor)
service_type = service_descriptor[0]
service_descriptors = [metadata_service_desc] + service_descriptors
services = ServiceFactory.build_services(service_descriptors)
checksums = dict()
for service in services:
checksums[str(service.index)] = checksum(service.main)
# Adding proof to the ddo.
ddo.add_proof(checksums, wallet)
did = ddo.assign_did(f'did:op:{remove_0x_prefix(ddo.data_token_address)}')
ddo_service_endpoint.replace('{did}', did)
services[0].set_service_endpoint(ddo_service_endpoint)
stype_to_service = {s.type: s for s in services}
_service = stype_to_service[service_type]
for service in services:
ddo.add_service(service)
# ddo.proof['signatureValue'] = ocean_lib.sign_hash(
# did_to_id_bytes(did), account)
ddo.add_public_key(did, wallet.address)
ddo.add_authentication(did, PUBLIC_KEY_TYPE_RSA)
# if not plecos.is_valid_dict_local(ddo.metadata):
# print(f'invalid metadata: {plecos.validate_dict_local(ddo.metadata)}')
# assert False, f'invalid metadata: {plecos.validate_dict_local(ddo.metadata)}'
files_list_str = json.dumps(metadata['main']['files'])
encrypted_files = encrypt_document(client, did, files_list_str, wallet)
# encrypted_files = do_encrypt(files_list_str, provider_wallet)
# only assign if the encryption worked
if encrypted_files:
index = 0
for file in metadata['main']['files']:
file['index'] = index
index = index + 1
del file['url']
metadata['encryptedFiles'] = encrypted_files
web3 = Web3Provider.get_web3()
block = web3.eth.blockNumber
try:
data = lzma.compress(web3.toBytes(text=ddo.as_text()))
tx_id = metadata_contract.create(ddo.asset_id, bytes([1]), data,
wallet)
if not metadata_contract.verify_tx(tx_id):
raise AssertionError(
f'create DDO on-chain failed, transaction status is 0. Transaction hash is {tx_id}'
)
except Exception as e:
print(f'error publishing ddo {ddo.did} in Aquarius: {e}')
raise
log = metadata_contract.get_event_log(
metadata_contract.EVENT_METADATA_CREATED, block, ddo.asset_id, 30)
assert log, f'no ddo created event.'
ddo = wait_for_ddo(aqua, ddo.did)
assert ddo, f'resolve did {ddo.did} failed.'
return ddo
def test_ddo_on_chain():
config = ConfigProvider.get_config()
ddo_address = get_contracts_addresses(
"ganache", config)[MetadataContract.CONTRACT_NAME]
dtfactory_address = get_contracts_addresses(
"ganache", config)[DTFactory.CONTRACT_NAME]
ddo_registry = MetadataContract(ddo_address)
wallet = get_publisher_wallet()
web3 = Web3Provider.get_web3()
dtfactory = DTFactory(dtfactory_address)
tx_id = dtfactory.createToken("", "dt1", "dt1", 1000, wallet)
dt = DataToken(dtfactory.get_token_address(tx_id))
# test create ddo
asset = get_ddo_sample(dt.address)
old_name = asset.metadata["main"]["name"]
txid = ddo_registry.create(
asset.asset_id, b"", lzma.compress(web3.toBytes(text=asset.as_text())),
wallet)
assert ddo_registry.verify_tx(txid), f"create ddo failed: txid={txid}"
logs = ddo_registry.event_MetadataCreated.processReceipt(
ddo_registry.get_tx_receipt(txid))
assert logs, f"no logs found for create ddo tx {txid}"
log = logs[0]
assert add_0x_prefix(log.args.dataToken) == asset.asset_id
# read back the asset ddo from the event log
ddo_text = web3.toText(lzma.decompress(log.args.data))
assert ddo_text == asset.as_text(), "ddo text does not match original."
_asset = Asset(json_text=ddo_text)
assert _asset.did == asset.did, "did does not match."
name = _asset.metadata["main"]["name"]
assert name == old_name, f"name does not match: {name} != {old_name}"
# test_update ddo
asset.metadata["main"]["name"] = "updated name for test"
txid = ddo_registry.update(
asset.asset_id, b"", lzma.compress(web3.toBytes(text=asset.as_text())),
wallet)
assert ddo_registry.verify_tx(txid), f"update ddo failed: txid={txid}"
logs = ddo_registry.event_MetadataUpdated.processReceipt(
ddo_registry.get_tx_receipt(txid))
assert logs, f"no logs found for update ddo tx {txid}"
log = logs[0]
assert add_0x_prefix(log.args.dataToken) == asset.asset_id
# read back the asset ddo from the event log
ddo_text = web3.toText(lzma.decompress(log.args.data))
assert ddo_text == asset.as_text(), "ddo text does not match original."
_asset = Asset(json_text=ddo_text)
assert (_asset.metadata["main"]["name"] == "updated name for test"
), "name does not seem to be updated."
assert DataToken(asset.asset_id).contract_concise.isMinter(wallet.address)
# test update fails from wallet other than the original publisher
bob = get_consumer_wallet()
try:
txid = ddo_registry.update(
asset.asset_id, b"",
lzma.compress(web3.toBytes(text=asset.as_text())), bob)
assert ddo_registry.verify_tx(
txid) is False, f"update ddo failed: txid={txid}"
logs = ddo_registry.event_MetadataUpdated.processReceipt(
ddo_registry.get_tx_receipt(txid))
assert (
not logs
), f"should be no logs for MetadataUpdated, but seems there are some logs: tx {txid}, logs {logs}"
except ValueError:
print("as expected, only owner can update a published ddo.")
# test ddoOwner
assert DataToken(asset.asset_id).contract_concise.isMinter(
wallet.address
), (f"ddo owner does not match the expected publisher address {wallet.address}, "
f"owner is {DataToken(asset.asset_id).contract_concise.minter(wallet.address)}"
)
def create(
self,
metadata: dict,
publisher_wallet: Wallet,
services: Optional[list] = None,
owner_address: Optional[str] = None,
data_token_address: Optional[str] = None,
provider_uri: Optional[str] = None,
dt_name: Optional[str] = None,
dt_symbol: Optional[str] = None,
dt_blob: Optional[str] = None,
dt_cap: Optional[int] = None,
encrypt: Optional[bool] = False,
) -> Optional[V3Asset]:
"""Register an asset on-chain.
Creating/deploying a DataToken contract and in the Metadata store (Aquarius).
:param metadata: dict conforming to the Metadata accepted by Ocean Protocol.
:param publisher_wallet: Wallet of the publisher registering this asset
:param services: list of Service objects.
:param owner_address: hex str the ethereum address to assign asset ownership to. After
registering the asset on-chain, the ownership is transferred to this address
:param data_token_address: hex str the address of the data token smart contract. The new
asset will be associated with this data token address.
:param provider_uri: str URL of service provider. This will be used as base to
construct the serviceEndpoint for the `access` (download) service
:param dt_name: str name of DataToken if creating a new one
:param dt_symbol: str symbol of DataToken if creating a new one
:param dt_blob: str blob of DataToken if creating a new one. A `blob` is any text
to be stored with the ERC20 DataToken contract for any purpose.
:param dt_cap: int amount of DataTokens to mint, denoted in wei
:return: DDO instance
"""
assert isinstance(
metadata, dict
), f"Expected metadata of type dict, got {type(metadata)}"
# copy metadata so we don't change the original
metadata_copy = copy.deepcopy(metadata)
asset_type = metadata_copy["main"]["type"]
assert asset_type in (
"dataset",
"algorithm",
), f"Invalid/unsupported asset type {asset_type}"
validation_result, validation_errors = self.validate(metadata)
if not validation_result:
msg = f"Metadata has validation errors: {validation_errors}"
logger.error(msg)
raise ValueError(msg)
urls = [item["url"] for item in metadata["main"]["files"]]
if not provider_uri:
provider_uri = DataServiceProvider.get_url(self._config)
for url in urls:
if not DataServiceProvider.check_single_file_info(url, provider_uri):
msg = f"The URL of this service can not be accessed: {url}."
logger.error(msg)
raise ValueError(msg)
services = services or []
services = self._add_defaults(
services, metadata_copy, provider_uri, publisher_wallet
)
checksum_dict = dict()
for service in services:
checksum_dict[str(service.index)] = checksum(service.main)
# Create a DDO object
asset = V3Asset()
# Adding proof to the ddo.
asset.add_proof(checksum_dict, publisher_wallet)
#################
# DataToken
address = DTFactory.configured_address(
get_network_name(web3=self._web3), self._config.address_file
)
dtfactory = DTFactory(self._web3, address)
if not data_token_address:
blob = dt_blob or ""
name = dt_name or metadata["main"]["name"]
symbol = dt_symbol or name
# register on-chain
_cap = dt_cap if dt_cap else DataToken.DEFAULT_CAP
tx_id = dtfactory.createToken(
blob, name, symbol, _cap, from_wallet=publisher_wallet
)
data_token = DataToken(self._web3, dtfactory.get_token_address(tx_id))
if not data_token:
logger.warning("Creating new data token failed.")
return None
data_token_address = data_token.address
logger.info(
f"Successfully created data token with address "
f"{data_token.address} for new dataset asset."
)
# owner_address is set as minter only if creating new data token. So if
# `data_token_address` is set `owner_address` has no effect.
if owner_address:
data_token.proposeMinter(owner_address, from_wallet=publisher_wallet)
else:
if not dtfactory.verify_data_token(data_token_address):
raise ContractNotFound(
f"datatoken address {data_token_address} is not found in the DTFactory events."
)
# verify data_token_address
dt = DataToken(self._web3, data_token_address)
minter = dt.contract.caller.minter()
if not minter:
raise AssertionError(
f"datatoken address {data_token_address} does not seem to be a valid DataToken contract."
)
elif minter.lower() != publisher_wallet.address.lower():
raise AssertionError(
f"Minter of datatoken {data_token_address} is not the same as the publisher."
)
assert (
data_token_address
), "data_token_address is required for publishing a dataset asset."
# Generating the did and adding to the ddo.
did = f"did:op:{remove_0x_prefix(data_token_address)}"
asset.did = did
logger.debug(f"Using datatoken address as did: {did}")
# Check if it's already registered first!
if self._get_aquarius().ddo_exists(did):
raise AquariusError(
f"Asset id {did} is already registered to another asset."
)
for service in services:
if service.type == ServiceTypes.METADATA:
ddo_service_endpoint = service.service_endpoint
if "{did}" in ddo_service_endpoint:
ddo_service_endpoint = ddo_service_endpoint.replace("{did}", did)
service.service_endpoint = ddo_service_endpoint
asset.add_service(service)
asset.proof["signatureValue"] = sign_hash(
encode_defunct(text=asset.asset_id), publisher_wallet
)
# Setup metadata service
# First compute files_encrypted
assert metadata_copy["main"][
"files"
], "files is required in the metadata main attributes."
logger.debug("Encrypting content urls in the metadata.")
publisher_signature = self._data_provider.sign_message(
publisher_wallet, asset.asset_id, provider_uri=provider_uri
)
_, encrypt_endpoint = self._data_provider.build_encrypt_endpoint(provider_uri)
files_encrypted = self._data_provider.encrypt_files_dict(
metadata_copy["main"]["files"],
encrypt_endpoint,
asset.asset_id,
publisher_wallet.address,
publisher_signature,
)
# only assign if the encryption worked
if files_encrypted:
logger.debug(f"Content urls encrypted successfully {files_encrypted}")
index = 0
for file in metadata_copy["main"]["files"]:
file["index"] = index
index = index + 1
del file["url"]
metadata_copy["encryptedFiles"] = files_encrypted
else:
raise AssertionError("Encrypting the files failed.")
logger.debug(
f"Generated asset and services, DID is {asset.did},"
f" metadata service @{ddo_service_endpoint}."
)
# Set datatoken address in the asset
asset.data_token_address = data_token_address
flags, asset_contents = self._build_asset_contents(asset, encrypt)
try:
# publish the new ddo in ocean-db/Aquarius
ddo_registry = self.ddo_registry()
tx_id = ddo_registry.create(
asset.asset_id, flags, asset_contents, publisher_wallet
)
if not ddo_registry.verify_tx(tx_id):
raise VerifyTxFailed(
f"create DDO on-chain failed, transaction status is 0. Transaction hash is {tx_id}"
)
logger.info("Asset/ddo published on-chain successfully.")
except ValueError as ve:
raise ValueError(f"Invalid value to publish in the metadata: {str(ve)}")
except Exception as e:
logger.error(f"Publish asset on-chain failed: {str(e)}")
raise
return asset
def test_get_token_address_fails(dtfactory_address):
"""Tests the failure case for get_token_address."""
dtfactory = DTFactory(dtfactory_address)
assert dtfactory.get_token_address("") == ""