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#!/usr/bin/env python3
# Copyright (c) 2014-2020 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test mempool re-org scenarios.
Test re-org scenarios with a mempool that contains transactions
that spend (directly or indirectly) coinbase transactions.
"""
from test_framework.blocktools import create_raw_transaction
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal, assert_raises_rpc_error
class MempoolCoinbaseTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 2
self.extra_args = [
[
'-whitelist=noban@127.0.0.1', # immediate tx relay
],
[]
]
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def run_test(self):
# Start with a 200 block chain
assert_equal(self.nodes[0].getblockcount(), 200)
# Mine four blocks. After this, nodes[0] blocks
# 101, 102, and 103 are spend-able.
new_blocks = self.nodes[1].generate(4)
self.sync_all()
node0_address = self.nodes[0].getnewaddress()
node1_address = self.nodes[1].getnewaddress()
# Three scenarios for re-orging coinbase spends in the memory pool:
# 1. Direct coinbase spend : spend_101
# 2. Indirect (coinbase spend in chain, child in mempool) : spend_102 and spend_102_1
# 3. Indirect (coinbase and child both in chain) : spend_103 and spend_103_1
# Use invalidatblock to make all of the above coinbase spends invalid (immature coinbase),
# and make sure the mempool code behaves correctly.
b = [self.nodes[0].getblockhash(n) for n in range(101, 105)]
coinbase_txids = [self.nodes[0].getblock(h)['tx'][0] for h in b]
spend_101_raw = create_raw_transaction(self.nodes[0], coinbase_txids[1], node1_address, amount=49.99)
spend_102_raw = create_raw_transaction(self.nodes[0], coinbase_txids[2], node0_address, amount=49.99)
spend_103_raw = create_raw_transaction(self.nodes[0], coinbase_txids[3], node0_address, amount=49.99)
# Create a transaction which is time-locked to two blocks in the future
timelock_tx = self.nodes[0].createrawtransaction(
inputs=[{
"txid": coinbase_txids[0],
"vout": 0,
}],
outputs={node0_address: 49.99},
locktime=self.nodes[0].getblockcount() + 2,
)
timelock_tx = self.nodes[0].signrawtransactionwithwallet(timelock_tx)["hex"]
# This will raise an exception because the timelock transaction is too immature to spend
assert_raises_rpc_error(-26, "non-final", self.nodes[0].sendrawtransaction, timelock_tx)
# Broadcast and mine spend_102 and 103:
spend_102_id = self.nodes[0].sendrawtransaction(spend_102_raw)
spend_103_id = self.nodes[0].sendrawtransaction(spend_103_raw)
self.nodes[0].generate(1)
# Time-locked transaction is still too immature to spend
assert_raises_rpc_error(-26, 'non-final', self.nodes[0].sendrawtransaction, timelock_tx)
# Create 102_1 and 103_1:
spend_102_1_raw = create_raw_transaction(self.nodes[0], spend_102_id, node1_address, amount=49.98)
spend_103_1_raw = create_raw_transaction(self.nodes[0], spend_103_id, node1_address, amount=49.98)
# Broadcast and mine 103_1:
spend_103_1_id = self.nodes[0].sendrawtransaction(spend_103_1_raw)
last_block = self.nodes[0].generate(1)
# Sync blocks, so that peer 1 gets the block before timelock_tx
# Otherwise, peer 1 would put the timelock_tx in recentRejects
self.sync_all()
# Time-locked transaction can now be spent
timelock_tx_id = self.nodes[0].sendrawtransaction(timelock_tx)
# ... now put spend_101 and spend_102_1 in memory pools:
spend_101_id = self.nodes[0].sendrawtransaction(spend_101_raw)
spend_102_1_id = self.nodes[0].sendrawtransaction(spend_102_1_raw)
assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, timelock_tx_id})
self.sync_all()
for node in self.nodes:
node.invalidateblock(last_block[0])
# Time-locked transaction is now too immature and has been removed from the mempool
# spend_103_1 has been re-orged out of the chain and is back in the mempool
assert_equal(set(self.nodes[0].getrawmempool()), {spend_101_id, spend_102_1_id, spend_103_1_id})
# Use invalidateblock to re-org back and make all those coinbase spends
# immature/invalid:
for node in self.nodes:
node.invalidateblock(new_blocks[0])
# mempool should be empty.
assert_equal(set(self.nodes[0].getrawmempool()), set())
self.sync_all()
if __name__ == '__main__':
MempoolCoinbaseTest().main()
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