git / moonbite-core / test/functional/test_framework/wallet.py · raw

#!/usr/bin/env python3# Copyright (c) 2020 The Bitcoin Core developers# Distributed under the MIT software license, see the accompanying# file COPYING or http://www.opensource.org/licenses/mit-license.php."""A limited-functionality wallet, which may replace a real wallet in tests"""from decimal import Decimalfrom test_framework.address import ADDRESS_BCRT1_P2WSH_OP_TRUEfrom test_framework.messages import (    COIN,    COutPoint,    CTransaction,    CTxIn,    CTxInWitness,    CTxOut,)from test_framework.script import (    CScript,    OP_TRUE,)from test_framework.util import (    assert_equal,    hex_str_to_bytes,    satoshi_round,)class MiniWallet:    def __init__(self, test_node):        self._test_node = test_node        self._utxos = []        self._address = ADDRESS_BCRT1_P2WSH_OP_TRUE        self._scriptPubKey = hex_str_to_bytes(self._test_node.validateaddress(self._address)['scriptPubKey'])    def generate(self, num_blocks):        """Generate blocks with coinbase outputs to the internal address, and append the outputs to the internal list"""        blocks = self._test_node.generatetoaddress(num_blocks, self._address)        for b in blocks:            cb_tx = self._test_node.getblock(blockhash=b, verbosity=2)['tx'][0]            self._utxos.append({'txid': cb_tx['txid'], 'vout': 0, 'value': cb_tx['vout'][0]['value']})        return blocks    def get_utxo(self):        """Return the last utxo. Can be used to get the change output immediately after a send_self_transfer"""        return self._utxos.pop()    def send_self_transfer(self, *, fee_rate=Decimal("0.003"), from_node, utxo_to_spend=None):        """Create and send a tx with the specified fee_rate. Fee may be exact or at most one satoshi higher than needed."""        self._utxos = sorted(self._utxos, key=lambda k: k['value'])        utxo_to_spend = utxo_to_spend or self._utxos.pop()  # Pick the largest utxo (if none provided) and hope it covers the fee        vsize = Decimal(96)        send_value = satoshi_round(utxo_to_spend['value'] - fee_rate * (vsize / 1000))        fee = utxo_to_spend['value'] - send_value        assert send_value > 0        tx = CTransaction()        tx.vin = [CTxIn(COutPoint(int(utxo_to_spend['txid'], 16), utxo_to_spend['vout']))]        tx.vout = [CTxOut(int(send_value * COIN), self._scriptPubKey)]        tx.wit.vtxinwit = [CTxInWitness()]        tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([OP_TRUE])]        tx_hex = tx.serialize().hex()        txid = from_node.sendrawtransaction(tx_hex)        self._utxos.append({'txid': txid, 'vout': 0, 'value': send_value})        tx_info = from_node.getmempoolentry(txid)        assert_equal(tx_info['vsize'], vsize)        assert_equal(tx_info['fee'], fee)        return {'txid': txid, 'wtxid': tx_info['wtxid'], 'hex': tx_hex}