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82 lines
3.7 KiB
82 lines
3.7 KiB
#!/usr/bin/env python3
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# Copyright (c) 2024 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Helpful routines for mempool testing."""
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from decimal import Decimal
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from .blocktools import (
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COINBASE_MATURITY,
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)
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from .util import (
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assert_equal,
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assert_greater_than,
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create_lots_of_big_transactions,
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gen_return_txouts,
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)
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from .wallet import (
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MiniWallet,
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)
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def fill_mempool(test_framework, node):
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"""Fill mempool until eviction.
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Allows for simpler testing of scenarios with floating mempoolminfee > minrelay
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Requires -datacarriersize=100000 and
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-maxmempool=5.
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It will not ensure mempools become synced as it
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is based on a single node and assumes -minrelaytxfee
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is 1 sat/vbyte.
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To avoid unintentional tx dependencies, the mempool filling txs are created with a
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tagged ephemeral miniwallet instance.
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"""
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test_framework.log.info("Fill the mempool until eviction is triggered and the mempoolminfee rises")
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txouts = gen_return_txouts()
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relayfee = node.getnetworkinfo()['relayfee']
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assert_equal(relayfee, Decimal('0.00001000'))
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tx_batch_size = 1
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num_of_batches = 75
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# Generate UTXOs to flood the mempool
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# 1 to create a tx initially that will be evicted from the mempool later
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# 75 transactions each with a fee rate higher than the previous one
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ephemeral_miniwallet = MiniWallet(node, tag_name="fill_mempool_ephemeral_wallet")
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test_framework.generate(ephemeral_miniwallet, 1 + num_of_batches * tx_batch_size)
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# Mine enough blocks so that the UTXOs are allowed to be spent
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test_framework.generate(node, COINBASE_MATURITY - 1)
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# Get all UTXOs up front to ensure none of the transactions spend from each other, as that may
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# change their effective feerate and thus the order in which they are selected for eviction.
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confirmed_utxos = [ephemeral_miniwallet.get_utxo(confirmed_only=True) for _ in range(num_of_batches * tx_batch_size + 1)]
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assert_equal(len(confirmed_utxos), num_of_batches * tx_batch_size + 1)
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test_framework.log.debug("Create a mempool tx that will be evicted")
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tx_to_be_evicted_id = ephemeral_miniwallet.send_self_transfer(
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from_node=node, utxo_to_spend=confirmed_utxos.pop(0), fee_rate=relayfee)["txid"]
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# Increase the tx fee rate to give the subsequent transactions a higher priority in the mempool
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# The tx has an approx. vsize of 65k, i.e. multiplying the previous fee rate (in sats/kvB)
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# by 130 should result in a fee that corresponds to 2x of that fee rate
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base_fee = relayfee * 130
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test_framework.log.debug("Fill up the mempool with txs with higher fee rate")
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with node.assert_debug_log(["rolling minimum fee bumped"]):
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for batch_of_txid in range(num_of_batches):
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fee = (batch_of_txid + 1) * base_fee
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utxos = confirmed_utxos[:tx_batch_size]
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create_lots_of_big_transactions(ephemeral_miniwallet, node, fee, tx_batch_size, txouts, utxos)
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del confirmed_utxos[:tx_batch_size]
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test_framework.log.debug("The tx should be evicted by now")
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# The number of transactions created should be greater than the ones present in the mempool
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assert_greater_than(tx_batch_size * num_of_batches, len(node.getrawmempool()))
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# Initial tx created should not be present in the mempool anymore as it had a lower fee rate
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assert tx_to_be_evicted_id not in node.getrawmempool()
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test_framework.log.debug("Check that mempoolminfee is larger than minrelaytxfee")
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assert_equal(node.getmempoolinfo()['minrelaytxfee'], Decimal('0.00001000'))
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assert_greater_than(node.getmempoolinfo()['mempoolminfee'], Decimal('0.00001000'))
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