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#!/usr/bin/env python3
# Copyright (c) 2014-2019 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 limiting together/eviction with the wallet."""
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_raises_rpc_error, gen_return_txouts
from test_framework.wallet import MiniWallet
class MempoolLimitTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
self.extra_args = [[
"-acceptnonstdtxn=1",
"-maxmempool=5",
"-spendzeroconfchange=0",
]]
self.supports_cli = False
def send_large_txs(self, node, miniwallet, txouts, fee_rate, tx_batch_size):
for _ in range(tx_batch_size):
tx = miniwallet.create_self_transfer(from_node=node, fee_rate=fee_rate)['tx']
for txout in txouts:
tx.vout.append(txout)
miniwallet.sendrawtransaction(from_node=node, tx_hex=tx.serialize().hex())
def run_test(self):
txouts = gen_return_txouts()
node=self.nodes[0]
miniwallet = MiniWallet(node)
relayfee = node.getnetworkinfo()['relayfee']
self.log.info('Check that mempoolminfee is minrelaytxfee')
assert_equal(node.getmempoolinfo()['minrelaytxfee'], Decimal('0.00001000'))
assert_equal(node.getmempoolinfo()['mempoolminfee'], Decimal('0.00001000'))
tx_batch_size = 25
num_of_batches = 3
# Generate UTXOs to flood the mempool
# 1 to create a tx initially that will be evicted from the mempool later
# 3 batches of multiple transactions with a fee rate much higher than the previous UTXO
# And 1 more to verify that this tx does not get added to the mempool with a fee rate less than the mempoolminfee
self.generate(miniwallet, 1 + (num_of_batches * tx_batch_size) + 1)
# Mine 99 blocks so that the UTXOs are allowed to be spent
self.generate(node, COINBASE_MATURITY - 1)
self.log.info('Create a mempool tx that will be evicted')
tx_to_be_evicted_id = miniwallet.send_self_transfer(from_node=node, fee_rate=relayfee)["txid"]
# Increase the tx fee rate massively to give the subsequent transactions a higher priority in the mempool
base_fee = relayfee * 1000
self.log.info("Fill up the mempool with txs with higher fee rate")
for batch_of_txid in range(num_of_batches):
fee_rate=(batch_of_txid + 1) * base_fee
self.send_large_txs(node, miniwallet, txouts, fee_rate, tx_batch_size)
self.log.info('The tx should be evicted by now')
# The number of transactions created should be greater than the ones present in the mempool
assert_greater_than(tx_batch_size * num_of_batches, len(node.getrawmempool()))
# Initial tx created should not be present in the mempool anymore as it had a lower fee rate
assert tx_to_be_evicted_id not in node.getrawmempool()
self.log.info('Check that mempoolminfee is larger than minrelaytxfee')
assert_equal(node.getmempoolinfo()['minrelaytxfee'], Decimal('0.00001000'))
assert_greater_than(node.getmempoolinfo()['mempoolminfee'], Decimal('0.00001000'))
# Deliberately try to create a tx with a fee less than the minimum mempool fee to assert that it does not get added to the mempool
self.log.info('Create a mempool tx that will not pass mempoolminfee')
assert_raises_rpc_error(-26, "mempool min fee not met", miniwallet.send_self_transfer, from_node=node, fee_rate=relayfee, mempool_valid=False)
if __name__ == '__main__':
MempoolLimitTest().main()
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