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bitcoin/test/functional/feature_txindex_compatibility.py

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Python
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#!/usr/bin/env python3
# Copyright (c) 2026 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 txindex forward compatibility.
"""
import shutil
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal
from test_framework.wallet import MiniWallet
class TxIndexTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 2
self.extra_args = [["-txindex"],["-txindex"]]
def skip_test_if_missing_module(self):
self.skip_if_no_previous_releases()
def setup_nodes(self):
self.add_nodes(
self.num_nodes,
extra_args=self.extra_args,
versions=[
None,
280200,
],
)
self.start_nodes()
def run_test(self):
self._test_txindex_compatibility()
def _test_txindex_compatibility(self):
node = self.nodes[0]
legacy_node = self.nodes[1]
self.wallet = MiniWallet(self.nodes[0])
tx1 = self.wallet.send_self_transfer(from_node=self.nodes[0])
self.generate(self.nodes[0], 1)
txId1 = tx1['txid']
for n in self.nodes:
self.wait_until(lambda: n.getindexinfo()['txindex']['synced'])
self.log.info("Ensure that queries to the txindex are consistent between the different index versions")
assert_equal(node.getrawtransaction(txId1), tx1['hex'])
assert_equal(legacy_node.getrawtransaction(txId1), tx1['hex'])
self.log.info("Exercise the new index running on a datadir with the old version")
self.stop_nodes()
self.cleanup_folder(node.chain_path)
shutil.copytree(legacy_node.chain_path, node.chain_path)
msg = "txindex contains entries in the legacy format"
with node.assert_debug_log(expected_msgs=[msg]):
self.start_node(0)
self.wait_until(lambda: node.getindexinfo()['txindex']['synced'])
assert_equal(node.getrawtransaction(txId1), tx1['hex'])
self.log.info("Test that looking up a newly added transaction in a mixed-format db is possible")
tx2 = self.wallet.send_self_transfer(from_node=self.nodes[0])
self.generate(self.nodes[0], 1, sync_fun=self.no_op)
txId2 = tx2['txid']
self.wait_until(lambda: node.getindexinfo()['txindex']['synced'])
assert_equal(node.getrawtransaction(txId1), tx1['hex'])
assert_equal(node.getrawtransaction(txId2), tx2['hex'])
if __name__ == '__main__':
TxIndexTest(__file__).main()