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198 lines
8.2 KiB
198 lines
8.2 KiB
#!/usr/bin/env python3 |
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# Copyright (c) 2015-2020 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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"""Test BIP65 (CHECKLOCKTIMEVERIFY). |
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Test that the CHECKLOCKTIMEVERIFY soft-fork activates at (regtest) block height |
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1351. |
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""" |
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from test_framework.blocktools import ( |
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create_block, |
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create_coinbase, |
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) |
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from test_framework.messages import ( |
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CTransaction, |
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msg_block, |
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) |
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from test_framework.p2p import P2PInterface |
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from test_framework.script import ( |
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CScript, |
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CScriptNum, |
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OP_1NEGATE, |
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OP_CHECKLOCKTIMEVERIFY, |
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OP_DROP, |
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) |
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from test_framework.test_framework import BitcoinTestFramework |
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from test_framework.util import assert_equal |
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from test_framework.wallet import ( |
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MiniWallet, |
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MiniWalletMode, |
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) |
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CLTV_HEIGHT = 1351 |
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# Helper function to modify a transaction by |
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# 1) prepending a given script to the scriptSig of vin 0 and |
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# 2) (optionally) modify the nSequence of vin 0 and the tx's nLockTime |
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def cltv_modify_tx(tx, prepend_scriptsig, nsequence=None, nlocktime=None): |
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assert_equal(len(tx.vin), 1) |
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if nsequence is not None: |
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tx.vin[0].nSequence = nsequence |
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tx.nLockTime = nlocktime |
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tx.vin[0].scriptSig = CScript(prepend_scriptsig + list(CScript(tx.vin[0].scriptSig))) |
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tx.rehash() |
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def cltv_invalidate(tx, failure_reason): |
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# Modify the signature in vin 0 and nSequence/nLockTime of the tx to fail CLTV |
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# |
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# According to BIP65, OP_CHECKLOCKTIMEVERIFY can fail due the following reasons: |
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# 1) the stack is empty |
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# 2) the top item on the stack is less than 0 |
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# 3) the lock-time type (height vs. timestamp) of the top stack item and the |
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# nLockTime field are not the same |
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# 4) the top stack item is greater than the transaction's nLockTime field |
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# 5) the nSequence field of the txin is 0xffffffff |
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assert failure_reason in range(5) |
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scheme = [ |
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# | Script to prepend to scriptSig | nSequence | nLockTime | |
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# +-------------------------------------------------+------------+--------------+ |
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[[OP_CHECKLOCKTIMEVERIFY], None, None], |
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[[OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP], None, None], |
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[[CScriptNum(1000), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0, 1296688602], # timestamp of genesis block |
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[[CScriptNum(1000), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0, 500], |
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[[CScriptNum(500), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0xffffffff, 500], |
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][failure_reason] |
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cltv_modify_tx(tx, prepend_scriptsig=scheme[0], nsequence=scheme[1], nlocktime=scheme[2]) |
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def cltv_validate(tx, height): |
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# Modify the signature in vin 0 and nSequence/nLockTime of the tx to pass CLTV |
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scheme = [[CScriptNum(height), OP_CHECKLOCKTIMEVERIFY, OP_DROP], 0, height] |
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cltv_modify_tx(tx, prepend_scriptsig=scheme[0], nsequence=scheme[1], nlocktime=scheme[2]) |
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class BIP65Test(BitcoinTestFramework): |
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def set_test_params(self): |
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self.num_nodes = 1 |
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self.extra_args = [[ |
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'-whitelist=noban@127.0.0.1', |
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'-par=1', # Use only one script thread to get the exact reject reason for testing |
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'-acceptnonstdtxn=1', # cltv_invalidate is nonstandard |
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]] |
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self.setup_clean_chain = True |
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self.rpc_timeout = 480 |
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def test_cltv_info(self, *, is_active): |
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assert_equal(self.nodes[0].getblockchaininfo()['softforks']['bip65'], { |
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"active": is_active, |
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"height": CLTV_HEIGHT, |
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"type": "buried", |
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}, |
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) |
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def run_test(self): |
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peer = self.nodes[0].add_p2p_connection(P2PInterface()) |
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wallet = MiniWallet(self.nodes[0], mode=MiniWalletMode.RAW_OP_TRUE) |
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self.test_cltv_info(is_active=False) |
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self.log.info("Mining %d blocks", CLTV_HEIGHT - 2) |
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wallet.generate(10) |
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self.nodes[0].generate(CLTV_HEIGHT - 2 - 10) |
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self.log.info("Test that invalid-according-to-CLTV transactions can still appear in a block") |
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# create one invalid tx per CLTV failure reason (5 in total) and collect them |
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invalid_cltv_txs = [] |
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for i in range(5): |
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spendtx = wallet.create_self_transfer(from_node=self.nodes[0])['tx'] |
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cltv_invalidate(spendtx, i) |
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invalid_cltv_txs.append(spendtx) |
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tip = self.nodes[0].getbestblockhash() |
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block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1 |
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block = create_block(int(tip, 16), create_coinbase(CLTV_HEIGHT - 1), block_time) |
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block.nVersion = 3 |
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block.vtx.extend(invalid_cltv_txs) |
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block.hashMerkleRoot = block.calc_merkle_root() |
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block.solve() |
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self.test_cltv_info(is_active=False) # Not active as of current tip and next block does not need to obey rules |
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peer.send_and_ping(msg_block(block)) |
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self.test_cltv_info(is_active=True) # Not active as of current tip, but next block must obey rules |
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assert_equal(self.nodes[0].getbestblockhash(), block.hash) |
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self.log.info("Test that blocks must now be at least version 4") |
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tip = block.sha256 |
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block_time += 1 |
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block = create_block(tip, create_coinbase(CLTV_HEIGHT), block_time) |
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block.nVersion = 3 |
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block.solve() |
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with self.nodes[0].assert_debug_log(expected_msgs=['{}, bad-version(0x00000003)'.format(block.hash)]): |
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peer.send_and_ping(msg_block(block)) |
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip) |
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peer.sync_with_ping() |
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self.log.info("Test that invalid-according-to-CLTV transactions cannot appear in a block") |
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block.nVersion = 4 |
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block.vtx.append(CTransaction()) # dummy tx after coinbase that will be replaced later |
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# create and test one invalid tx per CLTV failure reason (5 in total) |
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for i in range(5): |
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spendtx = wallet.create_self_transfer(from_node=self.nodes[0])['tx'] |
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cltv_invalidate(spendtx, i) |
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expected_cltv_reject_reason = [ |
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"non-mandatory-script-verify-flag (Operation not valid with the current stack size)", |
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"non-mandatory-script-verify-flag (Negative locktime)", |
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"non-mandatory-script-verify-flag (Locktime requirement not satisfied)", |
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"non-mandatory-script-verify-flag (Locktime requirement not satisfied)", |
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"non-mandatory-script-verify-flag (Locktime requirement not satisfied)", |
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][i] |
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# First we show that this tx is valid except for CLTV by getting it |
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# rejected from the mempool for exactly that reason. |
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assert_equal( |
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[{ |
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'txid': spendtx.hash, |
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'wtxid': spendtx.getwtxid(), |
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'allowed': False, |
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'reject-reason': expected_cltv_reject_reason, |
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}], |
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self.nodes[0].testmempoolaccept(rawtxs=[spendtx.serialize().hex()], maxfeerate=0), |
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) |
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# Now we verify that a block with this transaction is also invalid. |
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block.vtx[1] = spendtx |
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block.hashMerkleRoot = block.calc_merkle_root() |
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block.solve() |
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with self.nodes[0].assert_debug_log(expected_msgs=['CheckInputScripts on {} failed with {}'.format( |
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block.vtx[-1].hash, expected_cltv_reject_reason)]): |
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peer.send_and_ping(msg_block(block)) |
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip) |
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peer.sync_with_ping() |
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self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted") |
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cltv_validate(spendtx, CLTV_HEIGHT - 1) |
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block.vtx.pop(1) |
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block.vtx.append(spendtx) |
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block.hashMerkleRoot = block.calc_merkle_root() |
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block.solve() |
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self.test_cltv_info(is_active=True) # Not active as of current tip, but next block must obey rules |
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peer.send_and_ping(msg_block(block)) |
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self.test_cltv_info(is_active=True) # Active as of current tip |
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256) |
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if __name__ == '__main__': |
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BIP65Test().main()
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