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#!/usr/bin/env python3
# Copyright (c) 2020-2022 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 datacarrier functionality"""
from test_framework.messages import (
CTxOut,
MAX_OP_RETURN_RELAY,
)
from test_framework.script import (
CScript,
OP_RETURN,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.test_node import TestNode
from test_framework.util import (
assert_raises_rpc_error,
random_bytes,
)
from test_framework.wallet import MiniWallet
class DataCarrierTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 3
self.extra_args = [
[],
["-datacarrier=0"],
["-datacarrier=1", f"-datacarriersize={MAX_OP_RETURN_RELAY - 1}"]
]
def test_null_data_transaction(self, node: TestNode, data: bytes, success: bool) -> None:
tx = self.wallet.create_self_transfer(fee_rate=0)["tx"]
tx.vout.append(CTxOut(nValue=0, scriptPubKey=CScript([OP_RETURN, data])))
tx.vout[0].nValue -= tx.get_vsize() # simply pay 1sat/vbyte fee
tx_hex = tx.serialize().hex()
if success:
self.wallet.sendrawtransaction(from_node=node, tx_hex=tx_hex)
assert tx.rehash() in node.getrawmempool(True), f'{tx_hex} not in mempool'
else:
assert_raises_rpc_error(-26, "scriptpubkey", self.wallet.sendrawtransaction, from_node=node, tx_hex=tx_hex)
def run_test(self):
self.wallet = MiniWallet(self.nodes[0])
self.wallet.rescan_utxos()
# By default, only 80 bytes are used for data (+1 for OP_RETURN, +2 for the pushdata opcodes).
default_size_data = random_bytes(MAX_OP_RETURN_RELAY - 3)
too_long_data = random_bytes(MAX_OP_RETURN_RELAY - 2)
small_data = random_bytes(MAX_OP_RETURN_RELAY - 4)
self.log.info("Testing null data transaction with default -datacarrier and -datacarriersize values.")
self.test_null_data_transaction(node=self.nodes[0], data=default_size_data, success=True)
self.log.info("Testing a null data transaction larger than allowed by the default -datacarriersize value.")
self.test_null_data_transaction(node=self.nodes[0], data=too_long_data, success=False)
self.log.info("Testing a null data transaction with -datacarrier=false.")
self.test_null_data_transaction(node=self.nodes[1], data=default_size_data, success=False)
self.log.info("Testing a null data transaction with a size larger than accepted by -datacarriersize.")
self.test_null_data_transaction(node=self.nodes[2], data=default_size_data, success=False)
self.log.info("Testing a null data transaction with a size smaller than accepted by -datacarriersize.")
self.test_null_data_transaction(node=self.nodes[2], data=small_data, success=True)
if __name__ == '__main__':
DataCarrierTest().main()
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