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#!/usr/bin/env python3
# Copyright (c) 2024 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Helpful routines for mempool testing."""
from decimal import Decimal
from .blocktools import (
COINBASE_MATURITY,
)
from .messages import CTransaction
from .util import (
assert_equal,
assert_greater_than,
create_lots_of_big_transactions,
gen_return_txouts,
)
from .wallet import (
MiniWallet,
)
def fill_mempool(test_framework, node, *, tx_sync_fun=None):
"""Fill mempool until eviction.
Allows for simpler testing of scenarios with floating mempoolminfee > minrelay
Requires -datacarriersize=100000 and -maxmempool=5 and assumes -minrelaytxfee
is 1 sat/vbyte.
To avoid unintentional tx dependencies, the mempool filling txs are created with a
tagged ephemeral miniwallet instance.
"""
test_framework.log.info("Fill the mempool until eviction is triggered and the mempoolminfee rises")
txouts = gen_return_txouts()
relayfee = node.getnetworkinfo()['relayfee']
assert_equal(relayfee, Decimal('0.00001000'))
tx_batch_size = 1
num_of_batches = 75
# Generate UTXOs to flood the mempool
# 1 to create a tx initially that will be evicted from the mempool later
# 75 transactions each with a fee rate higher than the previous one
ephemeral_miniwallet = MiniWallet(node, tag_name="fill_mempool_ephemeral_wallet")
test_framework.generate(ephemeral_miniwallet, 1 + num_of_batches * tx_batch_size)
# Mine enough blocks so that the UTXOs are allowed to be spent
test_framework.generate(node, COINBASE_MATURITY - 1)
# Get all UTXOs up front to ensure none of the transactions spend from each other, as that may
# change their effective feerate and thus the order in which they are selected for eviction.
confirmed_utxos = [ephemeral_miniwallet.get_utxo(confirmed_only=True) for _ in range(num_of_batches * tx_batch_size + 1)]
assert_equal(len(confirmed_utxos), num_of_batches * tx_batch_size + 1)
test_framework.log.debug("Create a mempool tx that will be evicted")
tx_to_be_evicted_id = ephemeral_miniwallet.send_self_transfer(
from_node=node, utxo_to_spend=confirmed_utxos.pop(0), fee_rate=relayfee)["txid"]
def send_batch(fee):
utxos = confirmed_utxos[:tx_batch_size]
create_lots_of_big_transactions(ephemeral_miniwallet, node, fee, tx_batch_size, txouts, utxos)
del confirmed_utxos[:tx_batch_size]
# Increase the tx fee rate to give the subsequent transactions a higher priority in the mempool
# The tx has an approx. vsize of 65k, i.e. multiplying the previous fee rate (in sats/kvB)
# by 130 should result in a fee that corresponds to 2x of that fee rate
base_fee = relayfee * 130
batch_fees = [(i + 1) * base_fee for i in range(num_of_batches)]
test_framework.log.debug("Fill up the mempool with txs with higher fee rate")
for fee in batch_fees[:-3]:
send_batch(fee)
tx_sync_fun() if tx_sync_fun else test_framework.sync_mempools() # sync before any eviction
assert_equal(node.getmempoolinfo()["mempoolminfee"], Decimal("0.00001000"))
for fee in batch_fees[-3:]:
send_batch(fee)
tx_sync_fun() if tx_sync_fun else test_framework.sync_mempools() # sync after all evictions
test_framework.log.debug("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()
test_framework.log.debug("Check that mempoolminfee is larger than minrelaytxfee")
assert_equal(node.getmempoolinfo()['minrelaytxfee'], Decimal('0.00001000'))
assert_greater_than(node.getmempoolinfo()['mempoolminfee'], Decimal('0.00001000'))
def tx_in_orphanage(node, tx: CTransaction) -> bool:
"""Returns true if the transaction is in the orphanage."""
found = [o for o in node.getorphantxs(verbosity=1) if o["txid"] == tx.rehash() and o["wtxid"] == tx.getwtxid()]
return len(found) == 1
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