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1d566c067c
bitcoin/test/functional/mempool_fee_histogram.py
Kiminuo 1d566c067c test: Add mempool fee histogram test coverage 
Original commit: 0b6ba66238

Co-authored-by: João Barbosa <joao.paulo.barbosa@gmail.com>
Co-authored-by: Jon Atack <jon@atack.com>

Github-Pull: #21422
Rebased-From: c5e53d0d21
2025-02-21 23:31:39 +00:00

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#!/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 mempool fee histogram."""
from decimal import Decimal
from test_framework.blocktools import COINBASE_MATURITY
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_greater_than,
assert_greater_than_or_equal,
)
class MempoolFeeHistogramTest(BitcoinTestFramework):
def add_options(self, parser):
self.add_wallet_options(parser)
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def run_test(self):
node = self.nodes[0]
self.generate(self.nodes[0], COINBASE_MATURITY + 2, sync_fun=self.no_op)
# We have two UTXOs (utxo_1 and utxo_2) and we create three changeless transactions:
# - tx1 (5 sat/vB): spending utxo_1
# - tx2 (14 sat/vB): spending output from tx1
# - tx3 (6 sat/vB): spending utxo_2 and the output from tx2
self.log.info("Test getmempoolinfo does not return fee histogram by default")
assert ("fee_histogram" not in node.getmempoolinfo())
self.log.info("Test getmempoolinfo returns empty fee histogram when mempool is empty")
info = node.getmempoolinfo([1, 2, 3])
(non_empty_groups, empty_groups, total_fees) = self.histogram_stats(info['fee_histogram'])
assert_equal(0, non_empty_groups)
assert_equal(3, empty_groups)
assert_equal(0, total_fees)
for i in ['1', '2', '3']:
assert_equal(0, info['fee_histogram']['fee_rate_groups'][i]['size'])
assert_equal(0, info['fee_histogram']['fee_rate_groups'][i]['count'])
assert_equal(0, info['fee_histogram']['fee_rate_groups'][i]['fees'])
assert_equal(int(i), info['fee_histogram']['fee_rate_groups'][i]['from'])
self.log.info("Test that we have two spendable UTXOs and lock the second one")
utxos = node.listunspent()
assert_equal(2, len(utxos))
node.lockunspent(False, [{"txid": utxos[1]["txid"], "vout": utxos[1]["vout"]}])
self.log.info("Send tx1 transaction with 5 sat/vB fee rate")
node.sendtoaddress(address=node.getnewaddress(), amount=Decimal("50.0"), fee_rate=5, subtractfeefromamount=True)
self.log.info("Test fee rate histogram when mempool contains 1 transaction (tx1: 5 sat/vB)")
info = node.getmempoolinfo([1, 3, 5, 10])
(non_empty_groups, empty_groups, total_fees) = self.histogram_stats(info['fee_histogram'])
assert_equal(1, non_empty_groups)
assert_equal(3, empty_groups)
assert_equal(1, info['fee_histogram']['fee_rate_groups']['5']['count'])
assert_equal(total_fees, info['fee_histogram']['total_fees'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['1']['size'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['1']['count'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['1']['fees'])
assert_equal(1, info['fee_histogram']['fee_rate_groups']['1']['from'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['3']['size'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['3']['count'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['3']['fees'])
assert_equal(3, info['fee_histogram']['fee_rate_groups']['3']['from'])
assert_equal(188, info['fee_histogram']['fee_rate_groups']['5']['size'])
assert_equal(1, info['fee_histogram']['fee_rate_groups']['5']['count'])
assert_equal(940, info['fee_histogram']['fee_rate_groups']['5']['fees'])
assert_equal(5, info['fee_histogram']['fee_rate_groups']['5']['from'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['10']['size'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['10']['count'])
assert_equal(0, info['fee_histogram']['fee_rate_groups']['10']['fees'])
assert_equal(10, info['fee_histogram']['fee_rate_groups']['10']['from'])
self.log.info("Send tx2 transaction with 14 sat/vB fee rate (spends tx1 UTXO)")
node.sendtoaddress(address=node.getnewaddress(), amount=Decimal("25.0"), fee_rate=14, subtractfeefromamount=True)
self.log.info("Test fee rate histogram when mempool contains 2 transactions (tx1: 5 sat/vB, tx2: 14 sat/vB)")
info = node.getmempoolinfo([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
# Verify that tx1 and tx2 are reported in 5 sat/vB and 14 sat/vB in fee rate groups respectively
(non_empty_groups, empty_groups, total_fees) = self.histogram_stats(info['fee_histogram'])
assert_equal(2, non_empty_groups)
assert_equal(13, empty_groups)
assert_equal(1, info['fee_histogram']['fee_rate_groups']['5']['count'])
assert_equal(1, info['fee_histogram']['fee_rate_groups']['14']['count'])
assert_equal(total_fees, info['fee_histogram']['total_fees'])
# Unlock the second UTXO which we locked
node.lockunspent(True, [{"txid": utxos[1]["txid"], "vout": utxos[1]["vout"]}])
self.log.info("Send tx3 transaction with 6 sat/vB fee rate (spends all available UTXOs)")
node.sendtoaddress(address=node.getnewaddress(), amount=Decimal("99.9"), fee_rate=6, subtractfeefromamount=True)
self.log.info("Test fee rate histogram when mempool contains 3 transactions (tx1: 5 sat/vB, tx2: 14 sat/vB, tx3: 6 sat/vB)")
info = node.getmempoolinfo([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
# Verify that each of 5, 6 and 14 sat/vB fee rate groups contain one transaction
(non_empty_groups, empty_groups, total_fees) = self.histogram_stats(info['fee_histogram'])
assert_equal(3, non_empty_groups)
assert_equal(12, empty_groups)
for i in ['1', '2', '3', '4', '7', '8', '9', '10', '11', '12', '13', '15']:
assert_equal(0, info['fee_histogram']['fee_rate_groups'][i]['size'])
assert_equal(0, info['fee_histogram']['fee_rate_groups'][i]['count'])
assert_equal(0, info['fee_histogram']['fee_rate_groups'][i]['fees'])
assert_equal(int(i), info['fee_histogram']['fee_rate_groups'][i]['from'])
assert_equal(188, info['fee_histogram']['fee_rate_groups']['5']['size'])
assert_equal(1, info['fee_histogram']['fee_rate_groups']['5']['count'])
assert_equal(940, info['fee_histogram']['fee_rate_groups']['5']['fees'])
assert_equal(5, info['fee_histogram']['fee_rate_groups']['5']['from'])
assert_equal(356, info['fee_histogram']['fee_rate_groups']['6']['size'])
assert_equal(1, info['fee_histogram']['fee_rate_groups']['6']['count'])
assert_equal(2136, info['fee_histogram']['fee_rate_groups']['6']['fees'])
assert_equal(6, info['fee_histogram']['fee_rate_groups']['6']['from'])
assert_equal(141, info['fee_histogram']['fee_rate_groups']['14']['size'])
assert_equal(1, info['fee_histogram']['fee_rate_groups']['14']['count'])
assert_equal(1974, info['fee_histogram']['fee_rate_groups']['14']['fees'])
assert_equal(14, info['fee_histogram']['fee_rate_groups']['14']['from'])
assert_equal(total_fees, info['fee_histogram']['total_fees'])
def histogram_stats(self, histogram):
total_fees = 0
empty_count = 0
non_empty_count = 0
for key, bin in histogram['fee_rate_groups'].items():
assert_equal(int(key), bin['from'])
if bin['fees'] > 0:
assert_greater_than(bin['count'], 0)
else:
assert_equal(bin['count'], 0)
assert_greater_than_or_equal(bin['fees'], 0)
assert_greater_than_or_equal(bin['size'], 0)
total_fees += bin['fees']
if bin['count'] == 0:
empty_count += 1
else:
non_empty_count += 1
return (non_empty_count, empty_count, total_fees)
if __name__ == '__main__':
MempoolFeeHistogramTest(__file__).main()
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