#!/usr/bin/env python3 # Copyright (c) 2014-2022 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.test_framework import BitcoinTestFramework from test_framework.util import assert_equal, assert_raises_rpc_error from test_framework.wallet import MiniWallet 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 run_test(self): wallet = MiniWallet(self.nodes[0]) # Start with a 200 block chain assert_equal(self.nodes[0].getblockcount(), 200) self.log.info("Add 4 coinbase utxos to the miniwallet") # Block 76 contains the first spendable coinbase txs. first_block = 76 # Three scenarios for re-orging coinbase spends in the memory pool: # 1. Direct coinbase spend : spend_1 # 2. Indirect (coinbase spend in chain, child in mempool) : spend_2 and spend_2_1 # 3. Indirect (coinbase and child both in chain) : spend_3 and spend_3_1 # Use invalidateblock 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(first_block, first_block+4)] coinbase_txids = [self.nodes[0].getblock(h)['tx'][0] for h in b] utxo_1 = wallet.get_utxo(txid=coinbase_txids[1]) utxo_2 = wallet.get_utxo(txid=coinbase_txids[2]) utxo_3 = wallet.get_utxo(txid=coinbase_txids[3]) self.log.info("Create three transactions spending from coinbase utxos: spend_1, spend_2, spend_3") spend_1 = wallet.create_self_transfer(utxo_to_spend=utxo_1) spend_2 = wallet.create_self_transfer(utxo_to_spend=utxo_2) spend_3 = wallet.create_self_transfer(utxo_to_spend=utxo_3) self.log.info("Create another transaction which is time-locked to two blocks in the future") utxo = wallet.get_utxo(txid=coinbase_txids[0]) timelock_tx = wallet.create_self_transfer( utxo_to_spend=utxo, locktime=self.nodes[0].getblockcount() + 2, )['hex'] self.log.info("Check that the time-locked transaction is too immature to spend") assert_raises_rpc_error(-26, "non-final", self.nodes[0].sendrawtransaction, timelock_tx) self.log.info("Broadcast and mine spend_2 and spend_3") wallet.sendrawtransaction(from_node=self.nodes[0], tx_hex=spend_2['hex']) wallet.sendrawtransaction(from_node=self.nodes[0], tx_hex=spend_3['hex']) self.log.info("Generate a block") self.generate(self.nodes[0], 1) self.log.info("Check that time-locked transaction is still too immature to spend") assert_raises_rpc_error(-26, 'non-final', self.nodes[0].sendrawtransaction, timelock_tx) self.log.info("Create spend_2_1 and spend_3_1") spend_2_1 = wallet.create_self_transfer(utxo_to_spend=spend_2["new_utxo"]) spend_3_1 = wallet.create_self_transfer(utxo_to_spend=spend_3["new_utxo"]) self.log.info("Broadcast and mine spend_3_1") spend_3_1_id = self.nodes[0].sendrawtransaction(spend_3_1['hex']) self.log.info("Generate a block") last_block = self.generate(self.nodes[0], 1) # generate() implicitly syncs blocks, so that peer 1 gets the block before timelock_tx # Otherwise, peer 1 would put the timelock_tx in m_recent_rejects self.log.info("The time-locked transaction can now be spent") timelock_tx_id = self.nodes[0].sendrawtransaction(timelock_tx) self.log.info("Add spend_1 and spend_2_1 to the mempool") spend_1_id = self.nodes[0].sendrawtransaction(spend_1['hex']) spend_2_1_id = self.nodes[0].sendrawtransaction(spend_2_1['hex']) assert_equal(set(self.nodes[0].getrawmempool()), {spend_1_id, spend_2_1_id, timelock_tx_id}) self.sync_all() self.log.info("invalidate the last block") for node in self.nodes: node.invalidateblock(last_block[0]) self.log.info("The time-locked transaction is now too immature and has been removed from the mempool") self.log.info("spend_3_1 has been re-orged out of the chain and is back in the mempool") assert_equal(set(self.nodes[0].getrawmempool()), {spend_1_id, spend_2_1_id, spend_3_1_id}) self.log.info("Use invalidateblock to re-org back and make all those coinbase spends immature/invalid") b = self.nodes[0].getblockhash(first_block + 100) for node in self.nodes: node.invalidateblock(b) self.log.info("Check that the mempool is empty") assert_equal(set(self.nodes[0].getrawmempool()), set()) self.sync_all() if __name__ == '__main__': MempoolCoinbaseTest().main()