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#!/usr/bin/env python3
# Copyright (c) 2022 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 dust limit mempool policy (`-dustrelayfee` parameter)"""
from decimal import Decimal
from test_framework.key import ECKey
from test_framework.messages import (
COIN,
CTxOut,
)
from test_framework.script import (
CScript,
OP_RETURN,
OP_TRUE,
)
from test_framework.script_util import (
key_to_p2pk_script,
key_to_p2pkh_script,
key_to_p2wpkh_script,
keys_to_multisig_script,
output_key_to_p2tr_script,
program_to_witness_script,
script_to_p2sh_script,
script_to_p2wsh_script,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.test_node import TestNode
from test_framework.util import (
assert_equal,
get_fee,
)
from test_framework.wallet import MiniWallet
DUST_RELAY_TX_FEE = 3000 # default setting [sat/kvB]
class DustRelayFeeTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
def test_dust_output(self, node: TestNode, dust_relay_fee: Decimal,
output_script: CScript, type_desc: str) -> None:
# determine dust threshold (see `GetDustThreshold`)
if output_script[0] == OP_RETURN:
dust_threshold = 0
else:
tx_size = len(CTxOut(nValue=0, scriptPubKey=output_script).serialize())
tx_size += 67 if output_script.IsWitnessProgram() else 148
dust_threshold = int(get_fee(tx_size, dust_relay_fee) * COIN)
self.log.info(f"-> Test {type_desc} output (size {len(output_script)}, limit {dust_threshold})")
# amount right on the dust threshold should pass
tx = self.wallet.create_self_transfer()["tx"]
tx.vout.append(CTxOut(nValue=dust_threshold, scriptPubKey=output_script))
tx.vout[0].nValue -= dust_threshold # keep total output value constant
tx_good_hex = tx.serialize().hex()
res = node.testmempoolaccept([tx_good_hex])[0]
assert_equal(res['allowed'], True)
# amount just below the dust threshold should fail
if dust_threshold > 0:
tx.vout[1].nValue -= 1
res = node.testmempoolaccept([tx.serialize().hex()])[0]
assert_equal(res['allowed'], False)
assert_equal(res['reject-reason'], 'dust')
# finally send the transaction to avoid running out of MiniWallet UTXOs
self.wallet.sendrawtransaction(from_node=node, tx_hex=tx_good_hex)
def run_test(self):
self.wallet = MiniWallet(self.nodes[0])
# prepare output scripts of each standard type
key = ECKey()
key.generate(compressed=False)
uncompressed_pubkey = key.get_pubkey().get_bytes()
key.generate(compressed=True)
pubkey = key.get_pubkey().get_bytes()
output_scripts = (
(key_to_p2pk_script(uncompressed_pubkey), "P2PK (uncompressed)"),
(key_to_p2pk_script(pubkey), "P2PK (compressed)"),
(key_to_p2pkh_script(pubkey), "P2PKH"),
(script_to_p2sh_script(CScript([OP_TRUE])), "P2SH"),
(key_to_p2wpkh_script(pubkey), "P2WPKH"),
(script_to_p2wsh_script(CScript([OP_TRUE])), "P2WSH"),
(output_key_to_p2tr_script(pubkey[1:]), "P2TR"),
# witness programs for segwitv2+ can be between 2 and 40 bytes
(program_to_witness_script(2, b'\x66' * 2), "P2?? (future witness version 2)"),
(program_to_witness_script(16, b'\x77' * 40), "P2?? (future witness version 16)"),
# largest possible output script considered standard
(keys_to_multisig_script([uncompressed_pubkey]*3), "bare multisig (m-of-3)"),
(CScript([OP_RETURN, b'superimportanthash']), "null data (OP_RETURN)"),
)
# test default (no parameter), disabled (=0) and a bunch of arbitrary dust fee rates [sat/kvB]
for dustfee_sat_kvb in (DUST_RELAY_TX_FEE, 0, 1, 66, 500, 1337, 12345, 21212, 333333):
dustfee_btc_kvb = dustfee_sat_kvb / Decimal(COIN)
if dustfee_sat_kvb == DUST_RELAY_TX_FEE:
self.log.info(f"Test default dust limit setting ({dustfee_sat_kvb} sat/kvB)...")
else:
dust_parameter = f"-dustrelayfee={dustfee_btc_kvb:.8f}"
self.log.info(f"Test dust limit setting {dust_parameter} ({dustfee_sat_kvb} sat/kvB)...")
self.restart_node(0, extra_args=[dust_parameter])
for output_script, description in output_scripts:
self.test_dust_output(self.nodes[0], dustfee_btc_kvb, output_script, description)
self.generate(self.nodes[0], 1)
if __name__ == '__main__':
DustRelayFeeTest().main()
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