#!/usr/bin/env python3 # Copyright (c) 2023 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 that wallet correctly tracks transactions that have been conflicted by blocks, particularly during reorgs. """ from decimal import Decimal from test_framework.test_framework import BitcoinTestFramework from test_framework.util import ( assert_equal, ) class TxConflicts(BitcoinTestFramework): def add_options(self, parser): self.add_wallet_options(parser) def set_test_params(self): self.num_nodes = 3 def skip_test_if_missing_module(self): self.skip_if_no_wallet() def get_utxo_of_value(self, from_tx_id, search_value): return next(tx_out["vout"] for tx_out in self.nodes[0].gettransaction(from_tx_id)["details"] if tx_out["amount"] == Decimal(f"{search_value}")) def run_test(self): self.log.info("Send tx from which to conflict outputs later") txid_conflict_from_1 = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), Decimal("10")) txid_conflict_from_2 = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), Decimal("10")) self.generate(self.nodes[0], 1) self.sync_blocks() self.log.info("Disconnect nodes to broadcast conflicts on their respective chains") self.disconnect_nodes(0, 1) self.disconnect_nodes(2, 1) self.log.info("Create transactions that conflict with each other") output_A = self.get_utxo_of_value(from_tx_id=txid_conflict_from_1, search_value=10) output_B = self.get_utxo_of_value(from_tx_id=txid_conflict_from_2, search_value=10) # First create a transaction that consumes both A and B outputs. # # | tx1 | -----> | | | | # | AB_parent_tx | ----> | Child_Tx | # | tx2 | -----> | | | | # inputs_tx_AB_parent = [{"txid": txid_conflict_from_1, "vout": output_A}, {"txid": txid_conflict_from_2, "vout": output_B}] tx_AB_parent = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs_tx_AB_parent, {self.nodes[0].getnewaddress(): Decimal("19.99998")})) # Secondly, create two transactions: One consuming output_A, and another one consuming output_B # # | tx1 | -----> | Tx_A_1 | # ---------------- # | tx2 | -----> | Tx_B_1 | # inputs_tx_A_1 = [{"txid": txid_conflict_from_1, "vout": output_A}] inputs_tx_B_1 = [{"txid": txid_conflict_from_2, "vout": output_B}] tx_A_1 = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs_tx_A_1, {self.nodes[0].getnewaddress(): Decimal("9.99998")})) tx_B_1 = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs_tx_B_1, {self.nodes[0].getnewaddress(): Decimal("9.99998")})) self.log.info("Broadcast conflicted transaction") txid_AB_parent = self.nodes[0].sendrawtransaction(tx_AB_parent["hex"]) self.generate(self.nodes[0], 1, sync_fun=self.no_op) # Now that 'AB_parent_tx' was broadcast, build 'Child_Tx' output_c = self.get_utxo_of_value(from_tx_id=txid_AB_parent, search_value=19.99998) inputs_tx_C_child = [({"txid": txid_AB_parent, "vout": output_c})] tx_C_child = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs_tx_C_child, {self.nodes[0].getnewaddress() : Decimal("19.99996")})) tx_C_child_txid = self.nodes[0].sendrawtransaction(tx_C_child["hex"]) self.generate(self.nodes[0], 1, sync_fun=self.no_op) self.log.info("Broadcast conflicting tx to node 1 and generate a longer chain") conflicting_txid_A = self.nodes[1].sendrawtransaction(tx_A_1["hex"]) self.generate(self.nodes[1], 4, sync_fun=self.no_op) conflicting_txid_B = self.nodes[1].sendrawtransaction(tx_B_1["hex"]) self.generate(self.nodes[1], 4, sync_fun=self.no_op) self.log.info("Connect nodes 0 and 1, trigger reorg and ensure that the tx is effectively conflicted") self.connect_nodes(0, 1) self.sync_blocks([self.nodes[0], self.nodes[1]]) conflicted_AB_tx = self.nodes[0].gettransaction(txid_AB_parent) tx_C_child = self.nodes[0].gettransaction(tx_C_child_txid) conflicted_A_tx = self.nodes[0].gettransaction(conflicting_txid_A) self.log.info("Verify, after the reorg, that Tx_A was accepted, and tx_AB and its Child_Tx are conflicting now") # Tx A was accepted, Tx AB was not. assert conflicted_AB_tx["confirmations"] < 0 assert conflicted_A_tx["confirmations"] > 0 # Conflicted tx should have confirmations set to the confirmations of the most conflicting tx assert_equal(-conflicted_AB_tx["confirmations"], conflicted_A_tx["confirmations"]) # Child should inherit conflicted state from parent assert_equal(-tx_C_child["confirmations"], conflicted_A_tx["confirmations"]) # Check the confirmations of the conflicting transactions assert_equal(conflicted_A_tx["confirmations"], 8) assert_equal(self.nodes[0].gettransaction(conflicting_txid_B)["confirmations"], 4) self.log.info("Now generate a longer chain that does not contain any tx") # Node2 chain without conflicts self.generate(self.nodes[2], 15, sync_fun=self.no_op) # Connect node0 and node2 and wait reorg self.connect_nodes(0, 2) self.sync_blocks() conflicted = self.nodes[0].gettransaction(txid_AB_parent) tx_C_child = self.nodes[0].gettransaction(tx_C_child_txid) self.log.info("Test that formerly conflicted transaction are inactive after reorg") # Former conflicted tx should be unconfirmed as it hasn't been yet rebroadcast assert_equal(conflicted["confirmations"], 0) # Former conflicted child tx should be unconfirmed as it hasn't been rebroadcast assert_equal(tx_C_child["confirmations"], 0) # Rebroadcast former conflicted tx and check it confirms smoothly self.nodes[2].sendrawtransaction(conflicted["hex"]) self.generate(self.nodes[2], 1) self.sync_blocks() former_conflicted = self.nodes[0].gettransaction(txid_AB_parent) assert_equal(former_conflicted["confirmations"], 1) assert_equal(former_conflicted["blockheight"], 217) if __name__ == '__main__': TxConflicts().main()