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132 lines
5.2 KiB
Python
Executable File
132 lines
5.2 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2021 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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"""
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Test mempool acceptance in case of an already known transaction
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with identical non-witness data different witness.
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"""
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from test_framework.messages import (
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COIN,
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COutPoint,
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CTransaction,
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CTxIn,
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CTxInWitness,
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CTxOut,
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sha256,
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)
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from test_framework.p2p import P2PTxInvStore
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from test_framework.script import (
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CScript,
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OP_0,
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OP_ELSE,
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OP_ENDIF,
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OP_EQUAL,
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OP_HASH160,
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OP_IF,
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OP_TRUE,
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hash160,
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)
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import (
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assert_equal,
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)
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class MempoolWtxidTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.setup_clean_chain = True
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def run_test(self):
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node = self.nodes[0]
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self.log.info('Start with empty mempool and 101 blocks')
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# The last 100 coinbase transactions are premature
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blockhash = node.generate(101)[0]
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txid = node.getblock(blockhash=blockhash, verbosity=2)["tx"][0]["txid"]
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assert_equal(node.getmempoolinfo()['size'], 0)
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self.log.info("Submit parent with multiple script branches to mempool")
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hashlock = hash160(b'Preimage')
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witness_script = CScript([OP_IF, OP_HASH160, hashlock, OP_EQUAL, OP_ELSE, OP_TRUE, OP_ENDIF])
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witness_program = sha256(witness_script)
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script_pubkey = CScript([OP_0, witness_program])
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parent = CTransaction()
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parent.vin.append(CTxIn(COutPoint(int(txid, 16), 0), b""))
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parent.vout.append(CTxOut(int(9.99998 * COIN), script_pubkey))
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parent.rehash()
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privkeys = [node.get_deterministic_priv_key().key]
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raw_parent = node.signrawtransactionwithkey(hexstring=parent.serialize().hex(), privkeys=privkeys)['hex']
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parent_txid = node.sendrawtransaction(hexstring=raw_parent, maxfeerate=0)
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node.generate(1)
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peer_wtxid_relay = node.add_p2p_connection(P2PTxInvStore())
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# Create a new transaction with witness solving first branch
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child_witness_script = CScript([OP_TRUE])
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child_witness_program = sha256(child_witness_script)
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child_script_pubkey = CScript([OP_0, child_witness_program])
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child_one = CTransaction()
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child_one.vin.append(CTxIn(COutPoint(int(parent_txid, 16), 0), b""))
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child_one.vout.append(CTxOut(int(9.99996 * COIN), child_script_pubkey))
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child_one.wit.vtxinwit.append(CTxInWitness())
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child_one.wit.vtxinwit[0].scriptWitness.stack = [b'Preimage', b'\x01', witness_script]
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child_one_wtxid = child_one.getwtxid()
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child_one_txid = child_one.rehash()
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# Create another identical transaction with witness solving second branch
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child_two = CTransaction()
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child_two.vin.append(CTxIn(COutPoint(int(parent_txid, 16), 0), b""))
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child_two.vout.append(CTxOut(int(9.99996 * COIN), child_script_pubkey))
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child_two.wit.vtxinwit.append(CTxInWitness())
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child_two.wit.vtxinwit[0].scriptWitness.stack = [b'', witness_script]
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child_two_wtxid = child_two.getwtxid()
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child_two_txid = child_two.rehash()
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assert_equal(child_one_txid, child_two_txid)
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assert child_one_wtxid != child_two_wtxid
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self.log.info("Submit child_one to the mempool")
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txid_submitted = node.sendrawtransaction(child_one.serialize().hex())
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assert_equal(node.getrawmempool(True)[txid_submitted]['wtxid'], child_one_wtxid)
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peer_wtxid_relay.wait_for_broadcast([child_one_wtxid])
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assert_equal(node.getmempoolinfo()["unbroadcastcount"], 0)
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# testmempoolaccept reports the "already in mempool" error
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assert_equal(node.testmempoolaccept([child_one.serialize().hex()]), [{
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"txid": child_one_txid,
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"wtxid": child_one_wtxid,
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"allowed": False,
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"reject-reason": "txn-already-in-mempool"
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}])
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testres_child_two = node.testmempoolaccept([child_two.serialize().hex()])[0]
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assert_equal(testres_child_two, {
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"txid": child_two_txid,
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"wtxid": child_two_wtxid,
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"allowed": False,
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"reject-reason": "txn-same-nonwitness-data-in-mempool"
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})
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# sendrawtransaction will not throw but quits early when the exact same transaction is already in mempool
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node.sendrawtransaction(child_one.serialize().hex())
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self.log.info("Connect another peer that hasn't seen child_one before")
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peer_wtxid_relay_2 = node.add_p2p_connection(P2PTxInvStore())
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self.log.info("Submit child_two to the mempool")
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# sendrawtransaction will not throw but quits early when a transaction with the same non-witness data is already in mempool
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node.sendrawtransaction(child_two.serialize().hex())
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# The node should rebroadcast the transaction using the wtxid of the correct transaction
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# (child_one, which is in its mempool).
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peer_wtxid_relay_2.wait_for_broadcast([child_one_wtxid])
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assert_equal(node.getmempoolinfo()["unbroadcastcount"], 0)
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if __name__ == '__main__':
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MempoolWtxidTest().main()
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