def set_tx(self, tx):
"""Reset the model to reflect tx."""
self.beginResetModel()
self.vout = []
for o in tx.vout:
self.vout.append(CMutableTxOut.from_txout(o))
self.endResetModel()
def set_tx(self, tx):
"""Reset the model to reflect tx."""
self.beginResetModel()
self.vout = []
for o in tx.vout:
self.vout.append(CMutableTxOut.from_txout(o))
self.endResetModel()
def bump_feerate(bitcoind, tx, feerate_add, prevouts_amount=None):
"""Bump the feerate of a CTransaction.
:param bitcoind: The bitcoind RPC connection, to access the wallet.
:param tx: The CTransaction which is to be bumped.
:param feerate_add: How much to increase the feerate, in sat/vbyte.
:param prevouts_amount: The sum of the value of all the consumed outputs.
:return: (CTransaction) The modified transaction.
"""
# Work on a copy
vin = [CMutableTxIn.from_txin(txin) for txin in tx.vin]
vout = [CMutableTxOut.from_txout(txout) for txout in tx.vout]
# FIXME: Add this to python-bitcoinlib
wit = CTxWitness([
CTxInWitness.from_txinwitness(txinwit) for txinwit in tx.wit.vtxinwit
])
mut_tx = CMutableTransaction(vin,
vout,
witness=wit,
nLockTime=tx.nLockTime,
nVersion=tx.nVersion)
fees = fees_to_add(bitcoind, mut_tx, feerate_add, prevouts_amount)
if bitcoind.getbalance() * COIN > fees:
return add_input(bitcoind, mut_tx, fees)
raise Exception("Could not bump fees, no suitable utxo available!")
def add_output(self, tx_out=None, output_index=None):
"""Add an output at output_index, or append one if output_index is None."""
if tx_out is None:
tx_out = CMutableTxOut()
elif tx_out.__class__ == CTxOut:
tx_out = CMutableTxOut.from_txout(tx_out)
if output_index is None:
output_index = len(self.vout)
self.beginInsertRows(QModelIndex(), output_index, output_index)
self.vout.insert(output_index, tx_out)
self.endInsertRows()
def add_output(self, tx_out=None, output_index=None):
"""Add an output at output_index, or append one if output_index is None."""
if tx_out is None:
tx_out = CMutableTxOut()
elif tx_out.__class__ == CTxOut:
tx_out = CMutableTxOut.from_txout(tx_out)
if output_index is None:
output_index = len(self.vout)
self.beginInsertRows(QModelIndex(), output_index, output_index)
self.vout.insert(output_index, tx_out)
self.endInsertRows()
def from_tx(cls, tx):
if not issubclass(tx.__class__, Transaction):
return super(Transaction, cls).from_tx(tx)
else:
kwfields = {}
for attr, _, _, default in transaction_fields:
if attr in ['vin', 'vout']:
continue
if hasattr(tx, attr):
kwfields[attr] = getattr(tx, attr)
vin = [CMutableTxIn.from_txin(txin) for txin in tx.vin]
vout = [CMutableTxOut.from_txout(txout) for txout in tx.vout]
kwfields['vin'] = vin
kwfields['vout'] = vout
return cls(kwfields=kwfields)
def bump_feerate(bitcoind, tx, feerate_add, prevouts_amount=None):
"""Bump the feerate of a CTransaction.
:param bitcoind: The bitcoind RPC connection, to access the wallet.
:param tx: The CTransaction which is to be bumped.
:param feerate_add: How much to increase the feerate, in sat/vbyte.
:param prevouts_amount: The sum of the value of all the consumed outputs.
:return: (CTransaction) The modified transaction.
"""
# Work on a copy
vin = [CMutableTxIn.from_txin(txin) for txin in tx.vin]
vout = [CMutableTxOut.from_txout(txout) for txout in tx.vout]
wit = CTxWitness([CTxInWitness.from_txinwitness(txinwit)
for txinwit in tx.wit.vtxinwit])
mut_tx = CMutableTransaction(vin, vout, witness=wit,
nLockTime=tx.nLockTime, nVersion=tx.nVersion)
fees = fees_to_add(bitcoind, mut_tx, feerate_add, prevouts_amount)
# No smart coin selection here, this is a demo
for coin in bitcoind.listunspent():
if coin["amount"] * Decimal(COIN) > fees and coin["spendable"]:
return add_input_output(bitcoind, mut_tx, coin, fees)
raise Exception("Could not bump fees, no suitable utxo!")
