def test_unsupported_condition_type():
from bigchaindb.common import transaction
from cryptoconditions.exceptions import UnsupportedTypeError
with pytest.raises(UnsupportedTypeError):
transaction._fulfillment_from_details({'type': 'a'})
with pytest.raises(UnsupportedTypeError):
transaction._fulfillment_to_details(MagicMock(type_name='a'))
def test_handle_threshold_overflow():
from bigchaindb.common import transaction
cond = {
'type': 'ed25519-sha-256',
'public_key': 'a' * 43,
}
for i in range(1000):
cond = {
'type': 'threshold-sha-256',
'threshold': 1,
'subconditions': [cond],
}
with pytest.raises(ThresholdTooDeep):
transaction._fulfillment_from_details(cond)
def prepare_transfer_transaction(*, inputs, recipients, asset, metadata=None):
"""Prepares a ``"TRANSFER"`` transaction payload, ready to be
fulfilled.
Args:
inputs (:obj:`dict` | :obj:`list` | :obj:`tuple`): One or more
inputs holding the condition(s) that this transaction
intends to fulfill. Each input is expected to be a
:obj:`dict`.
recipients (:obj:`str` | :obj:`list` | :obj:`tuple`): One or
more public keys representing the new recipients(s) of the
asset being transferred.
asset (:obj:`dict`): A single-key dictionary holding the ``id``
of the asset being transferred with this transaction.
metadata (:obj:`dict`): Metadata associated with the
transaction. Defaults to ``None``.
Returns:
dict: The prepared ``"TRANSFER"`` transaction.
.. important::
* ``asset`` MUST be in the form of::
{
'id': '<Asset ID (i.e. TX ID of its CREATE transaction)>'
}
Example:
.. todo:: Replace this section with docs.
In case it may not be clear what an input should look like, say
Alice (public key: ``'3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf'``)
wishes to transfer an asset over to Bob
(public key: ``'EcRawy3Y22eAUSS94vLF8BVJi62wbqbD9iSUSUNU9wAA'``).
Let the asset creation transaction payload be denoted by
``tx``::
# noqa E501
>>> tx
{'asset': {'data': {'msg': 'Hello BigchainDB!'}},
'id': '9650055df2539223586d33d273cb8fd05bd6d485b1fef1caf7c8901a49464c87',
'inputs': [{'fulfillment': {'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf',
'type': 'ed25519-sha-256'},
'fulfills': None,
'owners_before': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']}],
'metadata': None,
'operation': 'CREATE',
'outputs': [{'amount': '1',
'condition': {'details': {'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf',
'type': 'ed25519-sha-256'},
'uri': 'ni:///sha-256;7ApQLsLLQgj5WOUipJg1txojmge68pctwFxvc3iOl54?fpt=ed25519-sha-256&cost=131072'},
'public_keys': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']}],
'version': '2.0'}
Then, the input may be constructed in this way::
output_index
output = tx['transaction']['outputs'][output_index]
input_ = {
'fulfillment': output['condition']['details'],
'input': {
'output_index': output_index,
'transaction_id': tx['id'],
},
'owners_before': output['owners_after'],
}
Displaying the input on the prompt would look like::
>>> input_
{'fulfillment': {
'public_key': '3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf',
'type': 'ed25519-sha-256'},
'input': {'output_index': 0,
'transaction_id': '9650055df2539223586d33d273cb8fd05bd6d485b1fef1caf7c8901a49464c87'},
'owners_before': ['3Cxh1eKZk3Wp9KGBWFS7iVde465UvqUKnEqTg2MW4wNf']}
To prepare the transfer:
>>> prepare_transfer_transaction(
... inputs=input_,
... recipients='EcRawy3Y22eAUSS94vLF8BVJi62wbqbD9iSUSUNU9wAA',
... asset=tx['transaction']['asset'],
... )
"""
if not isinstance(inputs, (list, tuple)):
inputs = (inputs, )
if not isinstance(recipients, (list, tuple)):
recipients = [([recipients], 1)]
# NOTE: Needed for the time being. See
# https://github.com/bigchaindb/bigchaindb/issues/797
if isinstance(recipients, tuple):
recipients = [(list(recipients), 1)]
fulfillments = [
Input(_fulfillment_from_details(input_['fulfillment']),
input_['owners_before'],
fulfills=TransactionLink(
txid=input_['fulfills']['transaction_id'],
output=input_['fulfills']['output_index']))
for input_ in inputs
]
transaction = Transaction.transfer(
fulfillments,
recipients,
asset_id=asset['id'],
metadata=metadata,
)
return transaction.to_dict()
