def MakeTransaction(self,
tx,
change_address=None,
fee=Fixed8(0),
from_addr=None,
use_standard=False,
watch_only_val=0,
exclude_vin=None,
use_vins_for_asset=None):
"""
This method is used to to calculate the necessary TransactionInputs (CoinReferences) and TransactionOutputs to
be used when creating a transaction that involves an exchange of system assets, ( NEO, Gas, etc )
Args:
tx: (Transaction) The Transaction to be used
change_address: (UInt160) The address any change for the transaction should be returned to
fee: (Fixed8) A fee to be attached to the Transaction for network processing purposes
from_addr: (UInt160) If present, all CoinReferences selected will only come from this address
use_standard: (bool) If true, only CoinReferences from standard addresses ( not contracts that are smart contracts ) will be used
watch_only_val: (int) 0 or CoinState.WATCH_ONLY, if present only choose coins that are in a WatchOnly address
exclude_vin: (list) A list of CoinReferences to NOT use in the making of this tx
use_vins_for_asset: (list) A list of CoinReferences to use
Returns:
tx: (Transaction) Returns the transaction with oupdated inputs and outputs
"""
tx.ResetReferences()
if not tx.outputs:
tx.outputs = []
if not tx.inputs:
tx.inputs = []
fee = fee + (tx.SystemFee() * Fixed8.FD())
# pdb.set_trace()
paytotal = {}
if tx.Type != int.from_bytes(TransactionType.IssueTransaction,
'little'):
for key, group in groupby(tx.outputs, lambda x: x.AssetId):
sum = Fixed8(0)
for item in group:
sum = sum + item.Value
paytotal[key] = sum
else:
paytotal = {}
if fee > Fixed8.Zero():
if Blockchain.SystemCoin().Hash in paytotal.keys():
paytotal[Blockchain.SystemCoin().
Hash] = paytotal[Blockchain.SystemCoin().Hash] + fee
else:
paytotal[Blockchain.SystemCoin().Hash] = fee
paycoins = {}
self._vin_exclude = exclude_vin
for assetId, amount in paytotal.items():
if use_vins_for_asset is not None and len(
use_vins_for_asset
) > 0 and use_vins_for_asset[1] == assetId:
paycoins[assetId] = self.FindCoinsByVins(use_vins_for_asset[0])
else:
paycoins[assetId] = self.FindUnspentCoinsByAssetAndTotal(
assetId,
amount,
from_addr=from_addr,
use_standard=use_standard,
watch_only_val=watch_only_val)
self._vin_exclude = None
for key, unspents in paycoins.items():
if unspents is None:
print("insufficient funds for asset id: %s " % key)
return None
input_sums = {}
for assetId, unspents in paycoins.items():
sum = Fixed8(0)
for coin in unspents:
sum = sum + coin.Output.Value
input_sums[assetId] = sum
if not change_address:
change_address = self.GetChangeAddress(from_addr=from_addr)
new_outputs = []
for assetId, sum in input_sums.items():
if sum > paytotal[assetId]:
difference = sum - paytotal[assetId]
output = TransactionOutput(AssetId=assetId,
Value=difference,
script_hash=change_address)
new_outputs.append(output)
inputs = []
for item in paycoins.values():
for ref in item:
inputs.append(ref.Reference)
tx.inputs = inputs
tx.outputs = tx.outputs + new_outputs
return tx
def SystemFee(self):
return self.Gas // Fixed8.FD()