#!/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. """ import time from test_framework.messages import ( CInv, MSG_WTX, msg_getdata, ) from test_framework.p2p import ( P2PTxInvStore, p2p_lock, ) 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 test_reorg_relay(self): self.log.info("Test that transactions from disconnected blocks are available for relay immediately") # Prevent time from moving forward self.nodes[1].setmocktime(int(time.time())) self.connect_nodes(0, 1) self.generate(self.wallet, 3) # Disconnect node0 and node1 to create different chains. self.disconnect_nodes(0, 1) # Connect a peer to node1, which doesn't have immediate tx relay peer1 = self.nodes[1].add_p2p_connection(P2PTxInvStore()) # Create a transaction that is included in a block. tx_disconnected = self.wallet.send_self_transfer(from_node=self.nodes[1]) self.generate(self.nodes[1], 1, sync_fun=self.no_op) # Create a transaction and submit it to node1's mempool. tx_before_reorg = self.wallet.send_self_transfer(from_node=self.nodes[1]) # Create a child of that transaction and submit it to node1's mempool. tx_child = self.wallet.send_self_transfer(utxo_to_spend=tx_disconnected["new_utxo"], from_node=self.nodes[1]) assert_equal(self.nodes[1].getmempoolentry(tx_child["txid"])["ancestorcount"], 1) assert_equal(len(peer1.get_invs()), 0) # node0 has a longer chain in which tx_disconnected was not confirmed. self.generate(self.nodes[0], 3, sync_fun=self.no_op) # Reconnect the nodes and sync chains. node0's chain should win. self.connect_nodes(0, 1) self.sync_blocks() # Child now has an ancestor from the disconnected block assert_equal(self.nodes[1].getmempoolentry(tx_child["txid"])["ancestorcount"], 2) assert_equal(self.nodes[1].getmempoolentry(tx_before_reorg["txid"])["ancestorcount"], 1) # peer1 should not have received an inv for any of the transactions during this time, as no # mocktime has elapsed for those transactions to be announced. Likewise, it cannot # request very recent, unanounced transactions. assert_equal(len(peer1.get_invs()), 0) # It's too early to request these two transactions requests_too_recent = msg_getdata([CInv(t=MSG_WTX, h=int(tx["tx"].getwtxid(), 16)) for tx in [tx_before_reorg, tx_child]]) peer1.send_and_ping(requests_too_recent) for _ in range(len(requests_too_recent.inv)): peer1.sync_with_ping() with p2p_lock: assert "tx" not in peer1.last_message assert "notfound" in peer1.last_message # Request the tx from the disconnected block request_disconnected_tx = msg_getdata([CInv(t=MSG_WTX, h=int(tx_disconnected["tx"].getwtxid(), 16))]) peer1.send_and_ping(request_disconnected_tx) # The tx from the disconnected block was never announced, and it entered the mempool later # than the transactions that are too recent. assert_equal(len(peer1.get_invs()), 0) with p2p_lock: # However, the node will answer requests for the tx from the recently-disconnected block. assert_equal(peer1.last_message["tx"].tx.getwtxid(),tx_disconnected["tx"].getwtxid()) self.nodes[1].setmocktime(int(time.time()) + 300) peer1.sync_with_ping() # the transactions are now announced assert_equal(len(peer1.get_invs()), 3) for _ in range(3): # make sure all tx requests have been responded to peer1.sync_with_ping() last_tx_received = peer1.last_message["tx"] tx_after_reorg = self.wallet.send_self_transfer(from_node=self.nodes[1]) request_after_reorg = msg_getdata([CInv(t=MSG_WTX, h=int(tx_after_reorg["tx"].getwtxid(), 16))]) assert tx_after_reorg["txid"] in self.nodes[1].getrawmempool() peer1.send_and_ping(request_after_reorg) with p2p_lock: assert_equal(peer1.last_message["tx"], last_tx_received) def run_test(self): self.wallet = MiniWallet(self.nodes[0]) wallet = self.wallet # 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() self.test_reorg_relay() if __name__ == '__main__': MempoolCoinbaseTest().main()