def get_spent()

in service/sdk_validator/resdb_validator/lib.py [0:0]

• 23 lines of code
• 9 McCabe index (conditional complexity)

    def get_spent(self, txid, output, current_transactions=[]):
        transactions = backend.query.get_spent(self.connection, txid,
                                               output)
        transactions = list(transactions) if transactions else []
        if len(transactions) > 1:
            raise core_exceptions.CriticalDoubleSpend(
                '`{}` was spent more than once. There is a problem'
                ' with the chain'.format(txid))

        current_spent_transactions = []
        for ctxn in current_transactions:
            for ctxn_input in ctxn.inputs:
                if ctxn_input.fulfills and\
                   ctxn_input.fulfills.txid == txid and\
                   ctxn_input.fulfills.output == output:
                    current_spent_transactions.append(ctxn)

        transaction = None
        if len(transactions) + len(current_spent_transactions) > 1:
            raise DoubleSpend('tx "{}" spends inputs twice'.format(txid))
        elif transactions:
            transaction = Transaction.from_db(self, transactions[0])
        elif current_spent_transactions:
            transaction = current_spent_transactions[0]

        return transaction