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Merge bitcoin/bitcoin#30636: test: assumeutxo: check that UTXO-querying RPCs operate on snapshot chainstate

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917e70a620 test: assumeutxo: check that UTXO-querying RPCs operate on snapshot chainstate (Sebastian Falbesoner)

Pull request description:

  Inspired by some manual testing I did for #28553, this PR checks that RPCs which explicitly query the UTXO set database (i.e. `gettxoutsetinfo`, `scantxoutset` and `gettxout`) operate on the snapshot chainstate as expected.

ACKs for top commit:
  fjahr:
    utACK 917e70a620
  achow101:
    ACK 917e70a620
  tdb3:
    ACK 917e70a620

Tree-SHA512: 40ecd1c5dd879234df1667fa5444a1fbbee9b7c456f597dc982d1a2bce46fe9107711b005ab829e570ef919a4914792f72f342d71d92bad2ae9434b5e68d5bd3
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Ava Chow 2024-08-21 13:30:00 -04:00
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25
test/functional/feature_assumeutxo.py
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@ -350,6 +350,31 @@ class AssumeutxoTest(BitcoinTestFramework):
assert_equal(loaded['coins_loaded'], SNAPSHOT_BASE_HEIGHT)
assert_equal(loaded['base_height'], SNAPSHOT_BASE_HEIGHT)
self.log.info("Check that UTXO-querying RPCs operate on snapshot chainstate")
snapshot_hash = loaded['tip_hash']
snapshot_num_coins = loaded['coins_loaded']
# coinstatsindex might be not caught up yet and is not relevant for this test, so don't use it
utxo_info = n1.gettxoutsetinfo(use_index=False)
assert_equal(utxo_info['txouts'], snapshot_num_coins)
assert_equal(utxo_info['height'], SNAPSHOT_BASE_HEIGHT)
assert_equal(utxo_info['bestblock'], snapshot_hash)
# find coinbase output at snapshot height on node0 and scan for it on node1,
# where the block is not available, but the snapshot was loaded successfully
coinbase_tx = n0.getblock(snapshot_hash, verbosity=2)['tx'][0]
assert_raises_rpc_error(-1, "Block not found on disk", n1.getblock, snapshot_hash)
coinbase_output_descriptor = coinbase_tx['vout'][0]['scriptPubKey']['desc']
scan_result = n1.scantxoutset('start', [coinbase_output_descriptor])
assert_equal(scan_result['success'], True)
assert_equal(scan_result['txouts'], snapshot_num_coins)
assert_equal(scan_result['height'], SNAPSHOT_BASE_HEIGHT)
assert_equal(scan_result['bestblock'], snapshot_hash)
scan_utxos = [(coin['txid'], coin['vout']) for coin in scan_result['unspents']]
assert (coinbase_tx['txid'], 0) in scan_utxos
txout_result = n1.gettxout(coinbase_tx['txid'], 0)
assert_equal(txout_result['scriptPubKey']['desc'], coinbase_output_descriptor)
def check_tx_counts(final: bool) -> None:
"""Check nTx and nChainTx intermediate values right after loading
the snapshot, and final values after the snapshot is validated."""