def minimum_tx_weight(self, tx: BaseTransaction) -> float:
""" Returns the minimum weight for the param tx
The minimum is calculated by the following function:
w = alpha * log(size, 2) + 4.0 + 4.0
----------------
1 + k / amount
:param tx: tx to calculate the minimum weight
:type tx: :py:class:`hathor.transaction.transaction.Transaction`
:return: minimum weight for the tx
:rtype: float
"""
# In test mode we don't validate the minimum weight for tx
# We do this to allow generating many txs for testing
if self.test_mode & TestMode.TEST_TX_WEIGHT:
return 1
if tx.is_genesis:
return self.min_tx_weight
tx_size = len(tx.get_struct())
# We need to take into consideration the decimal places because it is inside the amount.
# For instance, if one wants to transfer 20 HTRs, the amount will be 2000.
# Max below is preventing division by 0 when handling authority methods that have no outputs
amount = max(1, tx.sum_outputs) / (10**settings.DECIMAL_PLACES)
weight = (+self.min_tx_weight_coefficient * log(tx_size, 2) + 4 /
(1 + self.min_tx_weight_k / amount) + 4)
# Make sure the calculated weight is at least the minimum
weight = max(weight, self.min_tx_weight)
return weight
def send_data(self, tx: BaseTransaction) -> None:
""" Send a DATA message.
"""
# self.log.debug('Sending {tx.hash_hex}...', tx=tx)
payload = base64.b64encode(tx.get_struct()).decode('ascii')
self.send_message(ProtocolMessages.DATA, payload)
