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#!/usr/bin/env python3
# Copyright (c) 2020 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 LIP-0006
1. Test getdata 'mwebheader' *before* MWEB activation
2. Test getdata 'mwebheader' *after* MWEB activation
3. Test getdata 'mwebleafset' *before* MWEB activation
4. Test getdata 'mwebleafset' *after* MWEB activation
- Request from earlier block (not tip) to make sure rewind works
"""
from test_framework.messages import (
CBlockHeader,
CInv,
Hash,
hash256,
msg_getdata,
MSG_MWEB_HEADER,
MSG_MWEB_LEAFSET,
)
from test_framework.p2p import P2PInterface, p2p_lock
from test_framework.script import MAX_SCRIPT_ELEMENT_SIZE
from test_framework.test_framework import BitcoinTestFramework
from test_framework.ltc_util import FIRST_MWEB_HEIGHT, get_hogex_tx, get_mweb_header
from test_framework.util import assert_equal
# Can be used to mimic a light client requesting MWEB data from a full node
class MockLightClient(P2PInterface):
def __init__(self):
super().__init__()
self.merkle_blocks_with_mweb = {}
self.block_headers = {}
self.leafsets = {}
def request_mweb_header(self, block_hash):
want = msg_getdata([CInv(MSG_MWEB_HEADER, int(block_hash, 16))])
self.send_message(want)
def on_mwebheader(self, message):
self.merkle_blocks_with_mweb[message.header_hash()] = message.merkleblockwithmweb
def request_mweb_leafset(self, block_hash):
want = msg_getdata([CInv(MSG_MWEB_LEAFSET, int(block_hash, 16))])
self.send_message(want)
def on_mwebleafset(self, message):
self.leafsets[message.block_hash] = message.leafset
def on_block(self, message):
message.block.calc_sha256()
self.block_headers[Hash(message.block.sha256)] = CBlockHeader(message.block)
class MWEBP2PTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.extra_args = [['-whitelist=noban@127.0.0.1']] # immediate tx relay
self.num_nodes = 1
def assert_mweb_header(self, node, light_client, post_mweb_block_hash):
assert post_mweb_block_hash in light_client.merkle_blocks_with_mweb
merkle_block_with_mweb = light_client.merkle_blocks_with_mweb[post_mweb_block_hash]
# Check block header is correct
assert Hash.from_hex(post_mweb_block_hash) in light_client.block_headers
block_header = light_client.block_headers[Hash.from_hex(post_mweb_block_hash)]
assert_equal(block_header, merkle_block_with_mweb.merkle.header)
# Check MWEB header is correct
mweb_header = get_mweb_header(node, post_mweb_block_hash)
assert_equal(mweb_header, merkle_block_with_mweb.mweb_header)
# Check HogEx transaction is correct
hogex_tx = get_hogex_tx(node, post_mweb_block_hash)
assert_equal(hogex_tx, merkle_block_with_mweb.hogex)
# Check Merkle tree
merkle_tree = merkle_block_with_mweb.merkle.txn
assert_equal(3, merkle_tree.nTransactions)
assert_equal(2, len(merkle_tree.vHash))
left_hash = Hash(merkle_tree.vHash[0])
right_hash = Hash(merkle_tree.vHash[1])
assert_equal(Hash.from_hex(hogex_tx.hash), right_hash)
right_branch_bytes = hash256(right_hash.serialize() + right_hash.serialize())
merkle_root_bytes = hash256(left_hash.serialize() + right_branch_bytes)
assert_equal(Hash.from_byte_arr(merkle_root_bytes), Hash(block_header.hashMerkleRoot))
def run_test(self):
node = self.nodes[0]
light_client = node.add_p2p_connection(MockLightClient())
self.log.info("Generate pre-MWEB blocks")
pre_mweb_block_hash = node.generate(FIRST_MWEB_HEIGHT - 1)[-1]
self.log.info("Request 'mwebheader' and 'mwebleafset' for pre-MWEB block '{}'".format(pre_mweb_block_hash))
light_client.request_mweb_header(pre_mweb_block_hash)
light_client.request_mweb_leafset(pre_mweb_block_hash)
self.log.info("Activate MWEB")
node.sendtoaddress(node.getnewaddress(address_type='mweb'), 1)
post_mweb_block_hash = node.generate(1)[0]
self.log.info("Waiting for mweb_header")
light_client.wait_for_block(int(post_mweb_block_hash, 16), 5)
self.log.info("Pegin some additional coins")
node.sendtoaddress(node.getnewaddress(address_type='mweb'), 10)
post_mweb_block_hash2 = node.generate(1)[0]
light_client.wait_for_block(int(post_mweb_block_hash2, 16), 5)
self.log.info("Request 'mwebheader' and 'mwebleafset' for block '{}'".format(post_mweb_block_hash))
light_client.request_mweb_header(post_mweb_block_hash)
light_client.request_mweb_leafset(post_mweb_block_hash)
self.log.info("Waiting for 'mwebheader' and 'mwebleafset'")
light_client.wait_for_mwebheader(post_mweb_block_hash, 5)
light_client.wait_for_mwebleafset(post_mweb_block_hash, 5)
self.log.info("Assert results")
# Before MWEB activation, no merkle block should be returned
assert pre_mweb_block_hash not in light_client.merkle_blocks_with_mweb
# After MWEB activation, the requested merkle block should be returned
self.assert_mweb_header(node, light_client, post_mweb_block_hash)
# Before MWEB activation, no leafset should be returned
assert pre_mweb_block_hash not in light_client.leafsets
# After MWEB activation, the leafset should be returned
# Only 2 outputs should be in the UTXO set (the pegin and its change)
# That's '11' and then padded to the right with 0's, then serialized in big endian.
# So we expect the serialized leafset to be 0b11000000 or 0xc0
assert Hash.from_hex(post_mweb_block_hash) in light_client.leafsets
leafset = light_client.leafsets[Hash.from_hex(post_mweb_block_hash)]
assert_equal([0xc0], leafset)
if __name__ == '__main__':
MWEBP2PTest().main()
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