dash/test/functional/mempool_resurrect.py

#!/usr/bin/env python3
# Copyright (c) 2014-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test resurrection of mined transactions when the blockchain is re-organized."""

from test_framework.blocktools import create_raw_transaction
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal


class MempoolCoinbaseTest(BitcoinTestFramework):
    def set_test_params(self):
        self.num_nodes = 1

    def skip_test_if_missing_module(self):
        self.skip_if_no_wallet()

    def run_test(self):
        node0_address = self.nodes[0].getnewaddress()
        # Spend block 1/2/3's coinbase transactions
        # Mine a block.
        # Create three more transactions, spending the spends
        # Mine another block.
        # ... make sure all the transactions are confirmed
        # Invalidate both blocks
        # ... make sure all the transactions are put back in the mempool
        # Mine a new block
        # ... make sure all the transactions are confirmed again.

        b = [ self.nodes[0].getblockhash(n) for n in range(1, 4) ]
        coinbase_txids = [ self.nodes[0].getblock(h)['tx'][0] for h in b ]
        spends1_raw = [ create_raw_transaction(self.nodes[0], txid, node0_address, 500) for txid in coinbase_txids ]
        spends1_id = [ self.nodes[0].sendrawtransaction(tx, 0, False, True) for tx in spends1_raw ]

        blocks = []
        blocks.extend(self.nodes[0].generate(1))

        spends2_raw = [ create_raw_transaction(self.nodes[0], txid, node0_address, 499.99) for txid in spends1_id ]
        spends2_id = [ self.nodes[0].sendrawtransaction(tx, 0, False, True) for tx in spends2_raw ]

        blocks.extend(self.nodes[0].generate(1))

        # mempool should be empty, all txns confirmed
        assert_equal(set(self.nodes[0].getrawmempool()), set())
        for txid in spends1_id+spends2_id:
            tx = self.nodes[0].gettransaction(txid)
            assert tx["confirmations"] > 0

        # Use invalidateblock to re-org back
        for node in self.nodes:
            node.invalidateblock(blocks[0])

        # All txns should be back in mempool with 0 confirmations
        assert_equal(set(self.nodes[0].getrawmempool()), set(spends1_id+spends2_id))
        for txid in spends1_id+spends2_id:
            tx = self.nodes[0].gettransaction(txid)
            assert tx["confirmations"] == 0

        # Generate another block, they should all get mined
        self.nodes[0].generate(1)
        # mempool should be empty, all txns confirmed
        assert_equal(set(self.nodes[0].getrawmempool()), set())
        for txid in spends1_id+spends2_id:
            tx = self.nodes[0].gettransaction(txid)
            assert tx["confirmations"] > 0


if __name__ == '__main__':
    MempoolCoinbaseTest().main()