def test_that_function_should_raise_exception_when_type_is_not_allowed(
self, id_):
with pytest.raises(ConcentValidationError) as exception:
validate_uuid(id_)
assert_that(exception.value.error_code).is_equal_to(
ErrorCode.MESSAGE_WRONG_UUID_TYPE)
def claim_deposit(
subtask_id: str,
concent_use_case: ConcentUseCase,
requestor_ethereum_address: str,
provider_ethereum_address: str,
subtask_cost: int,
requestor_public_key: bytes,
provider_public_key: bytes,
) -> Tuple[Optional[DepositClaim], Optional[DepositClaim]]:
"""
The purpose of this operation is to check whether the clients participating in a use case have enough funds in their
deposits to cover all the costs associated with the use case in the pessimistic scenario.
"""
assert isinstance(concent_use_case, ConcentUseCase)
assert isinstance(requestor_ethereum_address, str)
assert isinstance(provider_ethereum_address, str)
assert isinstance(subtask_cost, int) and subtask_cost > 0
assert concent_use_case in [
ConcentUseCase.FORCED_ACCEPTANCE,
ConcentUseCase.ADDITIONAL_VERIFICATION
]
assert len(requestor_ethereum_address) == ETHEREUM_ADDRESS_LENGTH
assert len(provider_ethereum_address) == ETHEREUM_ADDRESS_LENGTH
assert provider_ethereum_address != requestor_ethereum_address
validate_bytes_public_key(requestor_public_key, 'requestor_public_key')
validate_bytes_public_key(provider_public_key, 'provider_public_key')
validate_uuid(subtask_id)
is_claim_against_provider: bool = (
concent_use_case == ConcentUseCase.ADDITIONAL_VERIFICATION
and settings.ADDITIONAL_VERIFICATION_COST > 0)
# Bankster creates Client and DepositAccount objects (if they don't exist yet) for the requestor
# and also for the provider if there's a non-zero claim against his account.
# This is done in single database transaction.
requestor_client: Client = get_or_create_with_retry(
Client, public_key=requestor_public_key)
requestor_deposit_account: DepositAccount = get_or_create_with_retry(
DepositAccount,
client=requestor_client,
ethereum_address=requestor_ethereum_address,
)
if is_claim_against_provider:
provider_client: Client = get_or_create_with_retry(
Client, public_key=provider_public_key)
provider_deposit_account: DepositAccount = get_or_create_with_retry(
DepositAccount,
client=provider_client,
ethereum_address=provider_ethereum_address,
)
# Bankster asks SCI about the amount of funds available in requestor's deposit.
requestor_deposit = service.get_deposit_value(
client_eth_address=requestor_ethereum_address) # pylint: disable=no-value-for-parameter
# If the amount claimed from provider's deposit is non-zero,
# Bankster asks SCI about the amount of funds available in his deposit.
if is_claim_against_provider:
provider_deposit = service.get_deposit_value(
client_eth_address=provider_ethereum_address) # pylint: disable=no-value-for-parameter
# Bankster puts database locks on DepositAccount objects
# that will be used as payers in newly created DepositClaims.
with non_nesting_atomic(using='control'):
DepositAccount.objects.select_for_update().filter(
client=requestor_client,
ethereum_address=requestor_ethereum_address,
)
if is_claim_against_provider:
DepositAccount.objects.select_for_update().filter(
client=provider_client,
ethereum_address=provider_ethereum_address,
)
# Bankster sums the amounts of all existing DepositClaims that have the same payer as the one being processed.
aggregated_claims_against_requestor = DepositClaim.objects.filter(
payer_deposit_account=requestor_deposit_account).aggregate(
sum_of_existing_claims=Coalesce(Sum('amount'), 0))
# If the existing claims against requestor's deposit are greater or equal to his current deposit,
# we can't add a new claim.
if requestor_deposit <= aggregated_claims_against_requestor[
'sum_of_existing_claims']:
return (None, None)
# Deposit lock for requestor.
claim_against_requestor = DepositClaim(
subtask_id=subtask_id,
payee_ethereum_address=provider_ethereum_address,
amount=subtask_cost,
concent_use_case=concent_use_case,
payer_deposit_account=requestor_deposit_account,
)
claim_against_requestor.full_clean()
claim_against_requestor.save()
if is_claim_against_provider:
# Bankster sums the amounts of all existing DepositClaims where the provider is the payer.
aggregated_claims_against_provider = DepositClaim.objects.filter(
payer_deposit_account=provider_deposit_account).aggregate(
sum_of_existing_claims=Coalesce(Sum('amount'), 0))
# If the total of existing claims and the current claim is greater or equal to the current deposit,
# we can't add a new claim.
provider_obligations = aggregated_claims_against_provider[
'sum_of_existing_claims'] + settings.ADDITIONAL_VERIFICATION_COST
if provider_deposit <= provider_obligations:
claim_against_requestor.delete()
raise BanksterTooSmallProviderDepositError(
f'Provider deposit is {provider_deposit} (required: {provider_obligations}'
)
# Deposit lock for provider.
if is_claim_against_provider:
claim_against_provider = DepositClaim(
subtask_id=subtask_id,
payee_ethereum_address=ethereum_public_key_to_address(
settings.CONCENT_ETHEREUM_PUBLIC_KEY),
amount=settings.ADDITIONAL_VERIFICATION_COST,
concent_use_case=concent_use_case,
payer_deposit_account=provider_deposit_account,
)
claim_against_provider.full_clean()
claim_against_provider.save()
else:
claim_against_provider = None # type: ignore
return (claim_against_requestor, claim_against_provider)
def test_that_function_should_pass_when_value_is_allowed(self, id_):
try:
validate_uuid(id_)
except Exception as exception: # pylint: disable=broad-except
pytest.fail(f'{exception}')
def _hexencode_uuid(value: str) -> bytes:
validate_uuid(value)
return binascii.hexlify(uuid.UUID(value).bytes)
def _hexencode_uuid(value: str) -> bytes:
validate_uuid(value)
return uuid_to_bytes32(uuid.UUID(value))
