# What's the delta fee that we need to get to our desired fees per byte at
# the current tx size?
delta_fee = math.ceil((desired_fees_per_byte * len(tx.serialize())) -
(value_in - value_out))
# Ensure termination; the loop converges so it can get stuck at no fee.
if delta_fee < 1:
break
logging.debug('Delta fee: %s' % str_money_value(delta_fee))
# Can we simply reduce the value of the change output?
new_change_txout_nValue = change_txout.nValue - delta_fee
if new_change_txout_nValue > DUST and new_change_txout_nValue >= min_change_txout_nValue:
value_out -= change_txout.nValue - new_change_txout_nValue
change_txout.nValue = new_change_txout_nValue
else:
# Looks like we need to add another input. We could be clever about
# this, but nah, just add the largest unspent input to the tx and try
# again.
try:
new_unspent = unspent[-1]
unspent = unspent[:-1]
except IndexError:
parser.exit('Not enough confirmed funds left unspent to bump fees')
new_outpoint = new_unspent['outpoint']
new_amount = new_unspent['amount']
logging.debug('Adding new input %s:%d with value %s BTC' % \
if not args.dryrun:
txid = rpc.sendrawtransaction(tx)
logging.info('Sent payment tx: %s' % b2lx(txid))
if not args.dryrun:
logging.info('Sleeping for %d seconds' % args.delay)
time.sleep(args.delay)
# Double-spend! Remove all but the change output
tx.vout = tx.vout[0:1]
change_txout = tx.vout[0]
value_out = value_in
change_txout.nValue = value_out
# FIXME: need to modularize this code
while (value_in - value_out) / len(tx.serialize()) < feeperbyte2:
# What's the delta fee that we need to get to our desired fees per byte at
# the current tx size?
delta_fee = math.ceil((feeperbyte2 * len(tx.serialize())) - (value_in - value_out))
logging.debug('Delta fee: %s' % str_money_value(delta_fee))
# If we simply subtract that from the change outpoint are we still above
# the dust threshold?
if change_txout.nValue - delta_fee > args.dust:
change_txout.nValue -= delta_fee
value_out -= delta_fee
str_money_value((value_in-value_out) / len(tx.serialize()) * 1000)))
txid = rpc.sendrawtransaction(tx)
print('Sent payment with txid: %s' % b2lx(txid))
print('Waiting for %d seconds before double spending' % 2)
time.sleep(10)
tx.vout = tx.vout[0:1]
change_txout = tx.vout[0]
value_out = value_in
change_txout.nValue = value_out
while (value_in - value_out) / len(tx.serialize()) < feeperbyte2:
# What's the delta fee that we need to get to our desired fees per byte at
# the current tx size?
delta_fee = math.ceil((feeperbyte2 * len(tx.serialize())) - (value_in - value_out))
print('Delta fee: %s' % str_money_value(delta_fee))
if change_txout.nValue - delta_fee > dust_amount:
change_txout.nValue -= delta_fee
value_out -= delta_fee
if value_in - value_out < 0:
new_outpoint = unspent[-1]['outpoint']
new_amount = unspent[-1]['amount']
# What's the delta fee that we need to get to our desired fees per byte at
# the current tx size?
delta_fee = math.ceil((desired_fees_per_byte * len(tx.serialize())) - (value_in - value_out))
# Ensure termination; the loop converges so it can get stuck at no fee.
if delta_fee < 1:
break
logging.debug('Delta fee: %s' % str_money_value(delta_fee))
# Can we simply reduce the value of the change output?
new_change_txout_nValue = change_txout.nValue - delta_fee
if new_change_txout_nValue > DUST and new_change_txout_nValue >= min_change_txout_nValue:
value_out -= change_txout.nValue - new_change_txout_nValue
change_txout.nValue = new_change_txout_nValue
else:
# Looks like we need to add another input. We could be clever about
# this, but nah, just add the largest unspent input to the tx and try
# again.
try:
new_unspent = unspent[-1]
unspent = unspent[:-1]
except IndexError:
parser.exit('Not enough confirmed funds left unspent to bump fees')
new_outpoint = new_unspent['outpoint']
new_amount = new_unspent['amount']
logging.debug('Adding new input %s:%d with value %s BTC' % \
