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423 lines
18 KiB
423 lines
18 KiB
#!/usr/bin/env python3 |
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# Copyright (c) 2014-2016 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 BIP68 implementation.""" |
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from test_framework.test_framework import BitcoinTestFramework |
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from test_framework.util import * |
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from test_framework.blocktools import * |
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SEQUENCE_LOCKTIME_DISABLE_FLAG = (1<<31) |
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SEQUENCE_LOCKTIME_TYPE_FLAG = (1<<22) # this means use time (0 means height) |
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SEQUENCE_LOCKTIME_GRANULARITY = 9 # this is a bit-shift |
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SEQUENCE_LOCKTIME_MASK = 0x0000ffff |
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# RPC error for non-BIP68 final transactions |
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NOT_FINAL_ERROR = "64: non-BIP68-final" |
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class BIP68Test(BitcoinTestFramework): |
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def __init__(self): |
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super().__init__() |
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self.num_nodes = 2 |
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self.setup_clean_chain = False |
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def setup_network(self): |
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self.nodes = [] |
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self.nodes.append(start_node(0, self.options.tmpdir, ["-debug"])) |
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self.nodes.append(start_node(1, self.options.tmpdir, ["-debug", "-acceptnonstdtxn=0"])) |
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self.is_network_split = False |
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self.relayfee = self.nodes[0].getnetworkinfo()["relayfee"] |
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connect_nodes(self.nodes[0], 1) |
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def run_test(self): |
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# Generate some coins |
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self.nodes[0].generate(110) |
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print("Running test disable flag") |
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self.test_disable_flag() |
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print("Running test sequence-lock-confirmed-inputs") |
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self.test_sequence_lock_confirmed_inputs() |
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print("Running test sequence-lock-unconfirmed-inputs") |
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self.test_sequence_lock_unconfirmed_inputs() |
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print("Running test BIP68 not consensus before versionbits activation") |
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self.test_bip68_not_consensus() |
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print("Verifying nVersion=2 transactions aren't standard") |
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self.test_version2_relay(before_activation=True) |
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print("Activating BIP68 (and 112/113)") |
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self.activateCSV() |
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print("Verifying nVersion=2 transactions are now standard") |
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self.test_version2_relay(before_activation=False) |
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print("Passed\n") |
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# Test that BIP68 is not in effect if tx version is 1, or if |
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# the first sequence bit is set. |
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def test_disable_flag(self): |
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# Create some unconfirmed inputs |
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new_addr = self.nodes[0].getnewaddress() |
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self.nodes[0].sendtoaddress(new_addr, 2) # send 2 BTC |
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utxos = self.nodes[0].listunspent(0, 0) |
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assert(len(utxos) > 0) |
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utxo = utxos[0] |
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tx1 = CTransaction() |
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value = int(satoshi_round(utxo["amount"] - self.relayfee)*COIN) |
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# Check that the disable flag disables relative locktime. |
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# If sequence locks were used, this would require 1 block for the |
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# input to mature. |
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sequence_value = SEQUENCE_LOCKTIME_DISABLE_FLAG | 1 |
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tx1.vin = [CTxIn(COutPoint(int(utxo["txid"], 16), utxo["vout"]), nSequence=sequence_value)] |
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tx1.vout = [CTxOut(value, CScript([b'a']))] |
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tx1_signed = self.nodes[0].signrawtransaction(ToHex(tx1))["hex"] |
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tx1_id = self.nodes[0].sendrawtransaction(tx1_signed) |
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tx1_id = int(tx1_id, 16) |
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# This transaction will enable sequence-locks, so this transaction should |
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# fail |
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tx2 = CTransaction() |
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tx2.nVersion = 2 |
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sequence_value = sequence_value & 0x7fffffff |
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tx2.vin = [CTxIn(COutPoint(tx1_id, 0), nSequence=sequence_value)] |
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tx2.vout = [CTxOut(int(value-self.relayfee*COIN), CScript([b'a']))] |
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tx2.rehash() |
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try: |
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self.nodes[0].sendrawtransaction(ToHex(tx2)) |
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except JSONRPCException as exp: |
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assert_equal(exp.error["message"], NOT_FINAL_ERROR) |
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else: |
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assert(False) |
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# Setting the version back down to 1 should disable the sequence lock, |
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# so this should be accepted. |
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tx2.nVersion = 1 |
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self.nodes[0].sendrawtransaction(ToHex(tx2)) |
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# Calculate the median time past of a prior block ("confirmations" before |
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# the current tip). |
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def get_median_time_past(self, confirmations): |
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block_hash = self.nodes[0].getblockhash(self.nodes[0].getblockcount()-confirmations) |
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return self.nodes[0].getblockheader(block_hash)["mediantime"] |
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# Test that sequence locks are respected for transactions spending confirmed inputs. |
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def test_sequence_lock_confirmed_inputs(self): |
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# Create lots of confirmed utxos, and use them to generate lots of random |
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# transactions. |
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max_outputs = 50 |
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addresses = [] |
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while len(addresses) < max_outputs: |
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addresses.append(self.nodes[0].getnewaddress()) |
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while len(self.nodes[0].listunspent()) < 200: |
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import random |
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random.shuffle(addresses) |
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num_outputs = random.randint(1, max_outputs) |
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outputs = {} |
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for i in range(num_outputs): |
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outputs[addresses[i]] = random.randint(1, 20)*0.01 |
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self.nodes[0].sendmany("", outputs) |
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self.nodes[0].generate(1) |
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utxos = self.nodes[0].listunspent() |
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# Try creating a lot of random transactions. |
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# Each time, choose a random number of inputs, and randomly set |
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# some of those inputs to be sequence locked (and randomly choose |
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# between height/time locking). Small random chance of making the locks |
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# all pass. |
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for i in range(400): |
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# Randomly choose up to 10 inputs |
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num_inputs = random.randint(1, 10) |
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random.shuffle(utxos) |
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# Track whether any sequence locks used should fail |
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should_pass = True |
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# Track whether this transaction was built with sequence locks |
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using_sequence_locks = False |
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tx = CTransaction() |
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tx.nVersion = 2 |
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value = 0 |
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for j in range(num_inputs): |
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sequence_value = 0xfffffffe # this disables sequence locks |
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# 50% chance we enable sequence locks |
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if random.randint(0,1): |
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using_sequence_locks = True |
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# 10% of the time, make the input sequence value pass |
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input_will_pass = (random.randint(1,10) == 1) |
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sequence_value = utxos[j]["confirmations"] |
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if not input_will_pass: |
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sequence_value += 1 |
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should_pass = False |
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# Figure out what the median-time-past was for the confirmed input |
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# Note that if an input has N confirmations, we're going back N blocks |
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# from the tip so that we're looking up MTP of the block |
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# PRIOR to the one the input appears in, as per the BIP68 spec. |
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orig_time = self.get_median_time_past(utxos[j]["confirmations"]) |
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cur_time = self.get_median_time_past(0) # MTP of the tip |
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# can only timelock this input if it's not too old -- otherwise use height |
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can_time_lock = True |
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if ((cur_time - orig_time) >> SEQUENCE_LOCKTIME_GRANULARITY) >= SEQUENCE_LOCKTIME_MASK: |
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can_time_lock = False |
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# if time-lockable, then 50% chance we make this a time lock |
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if random.randint(0,1) and can_time_lock: |
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# Find first time-lock value that fails, or latest one that succeeds |
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time_delta = sequence_value << SEQUENCE_LOCKTIME_GRANULARITY |
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if input_will_pass and time_delta > cur_time - orig_time: |
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sequence_value = ((cur_time - orig_time) >> SEQUENCE_LOCKTIME_GRANULARITY) |
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elif (not input_will_pass and time_delta <= cur_time - orig_time): |
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sequence_value = ((cur_time - orig_time) >> SEQUENCE_LOCKTIME_GRANULARITY)+1 |
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sequence_value |= SEQUENCE_LOCKTIME_TYPE_FLAG |
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tx.vin.append(CTxIn(COutPoint(int(utxos[j]["txid"], 16), utxos[j]["vout"]), nSequence=sequence_value)) |
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value += utxos[j]["amount"]*COIN |
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# Overestimate the size of the tx - signatures should be less than 120 bytes, and leave 50 for the output |
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tx_size = len(ToHex(tx))//2 + 120*num_inputs + 50 |
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tx.vout.append(CTxOut(int(value-self.relayfee*tx_size*COIN/1000), CScript([b'a']))) |
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rawtx = self.nodes[0].signrawtransaction(ToHex(tx))["hex"] |
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try: |
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self.nodes[0].sendrawtransaction(rawtx) |
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except JSONRPCException as exp: |
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assert(not should_pass and using_sequence_locks) |
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assert_equal(exp.error["message"], NOT_FINAL_ERROR) |
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else: |
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assert(should_pass or not using_sequence_locks) |
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# Recalculate utxos if we successfully sent the transaction |
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utxos = self.nodes[0].listunspent() |
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# Test that sequence locks on unconfirmed inputs must have nSequence |
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# height or time of 0 to be accepted. |
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# Then test that BIP68-invalid transactions are removed from the mempool |
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# after a reorg. |
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def test_sequence_lock_unconfirmed_inputs(self): |
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# Store height so we can easily reset the chain at the end of the test |
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cur_height = self.nodes[0].getblockcount() |
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# Create a mempool tx. |
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txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 2) |
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tx1 = FromHex(CTransaction(), self.nodes[0].getrawtransaction(txid)) |
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tx1.rehash() |
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# Anyone-can-spend mempool tx. |
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# Sequence lock of 0 should pass. |
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tx2 = CTransaction() |
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tx2.nVersion = 2 |
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tx2.vin = [CTxIn(COutPoint(tx1.sha256, 0), nSequence=0)] |
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tx2.vout = [CTxOut(int(tx1.vout[0].nValue - self.relayfee*COIN), CScript([b'a']))] |
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tx2_raw = self.nodes[0].signrawtransaction(ToHex(tx2))["hex"] |
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tx2 = FromHex(tx2, tx2_raw) |
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tx2.rehash() |
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self.nodes[0].sendrawtransaction(tx2_raw) |
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# Create a spend of the 0th output of orig_tx with a sequence lock |
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# of 1, and test what happens when submitting. |
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# orig_tx.vout[0] must be an anyone-can-spend output |
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def test_nonzero_locks(orig_tx, node, relayfee, use_height_lock): |
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sequence_value = 1 |
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if not use_height_lock: |
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sequence_value |= SEQUENCE_LOCKTIME_TYPE_FLAG |
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tx = CTransaction() |
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tx.nVersion = 2 |
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tx.vin = [CTxIn(COutPoint(orig_tx.sha256, 0), nSequence=sequence_value)] |
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tx.vout = [CTxOut(int(orig_tx.vout[0].nValue - relayfee*COIN), CScript([b'a']))] |
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tx.rehash() |
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try: |
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node.sendrawtransaction(ToHex(tx)) |
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except JSONRPCException as exp: |
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assert_equal(exp.error["message"], NOT_FINAL_ERROR) |
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assert(orig_tx.hash in node.getrawmempool()) |
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else: |
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# orig_tx must not be in mempool |
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assert(orig_tx.hash not in node.getrawmempool()) |
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return tx |
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test_nonzero_locks(tx2, self.nodes[0], self.relayfee, use_height_lock=True) |
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test_nonzero_locks(tx2, self.nodes[0], self.relayfee, use_height_lock=False) |
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# Now mine some blocks, but make sure tx2 doesn't get mined. |
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# Use prioritisetransaction to lower the effective feerate to 0 |
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self.nodes[0].prioritisetransaction(tx2.hash, -1e15, int(-self.relayfee*COIN)) |
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cur_time = int(time.time()) |
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for i in range(10): |
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self.nodes[0].setmocktime(cur_time + 600) |
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self.nodes[0].generate(1) |
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cur_time += 600 |
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assert(tx2.hash in self.nodes[0].getrawmempool()) |
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test_nonzero_locks(tx2, self.nodes[0], self.relayfee, use_height_lock=True) |
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test_nonzero_locks(tx2, self.nodes[0], self.relayfee, use_height_lock=False) |
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# Mine tx2, and then try again |
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self.nodes[0].prioritisetransaction(tx2.hash, 1e15, int(self.relayfee*COIN)) |
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# Advance the time on the node so that we can test timelocks |
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self.nodes[0].setmocktime(cur_time+600) |
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self.nodes[0].generate(1) |
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assert(tx2.hash not in self.nodes[0].getrawmempool()) |
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# Now that tx2 is not in the mempool, a sequence locked spend should |
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# succeed |
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tx3 = test_nonzero_locks(tx2, self.nodes[0], self.relayfee, use_height_lock=False) |
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assert(tx3.hash in self.nodes[0].getrawmempool()) |
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self.nodes[0].generate(1) |
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assert(tx3.hash not in self.nodes[0].getrawmempool()) |
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# One more test, this time using height locks |
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tx4 = test_nonzero_locks(tx3, self.nodes[0], self.relayfee, use_height_lock=True) |
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assert(tx4.hash in self.nodes[0].getrawmempool()) |
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# Now try combining confirmed and unconfirmed inputs |
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tx5 = test_nonzero_locks(tx4, self.nodes[0], self.relayfee, use_height_lock=True) |
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assert(tx5.hash not in self.nodes[0].getrawmempool()) |
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utxos = self.nodes[0].listunspent() |
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tx5.vin.append(CTxIn(COutPoint(int(utxos[0]["txid"], 16), utxos[0]["vout"]), nSequence=1)) |
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tx5.vout[0].nValue += int(utxos[0]["amount"]*COIN) |
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raw_tx5 = self.nodes[0].signrawtransaction(ToHex(tx5))["hex"] |
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try: |
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self.nodes[0].sendrawtransaction(raw_tx5) |
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except JSONRPCException as exp: |
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assert_equal(exp.error["message"], NOT_FINAL_ERROR) |
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else: |
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assert(False) |
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# Test mempool-BIP68 consistency after reorg |
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# |
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# State of the transactions in the last blocks: |
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# ... -> [ tx2 ] -> [ tx3 ] |
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# tip-1 tip |
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# And currently tx4 is in the mempool. |
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# |
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# If we invalidate the tip, tx3 should get added to the mempool, causing |
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# tx4 to be removed (fails sequence-lock). |
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self.nodes[0].invalidateblock(self.nodes[0].getbestblockhash()) |
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assert(tx4.hash not in self.nodes[0].getrawmempool()) |
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assert(tx3.hash in self.nodes[0].getrawmempool()) |
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# Now mine 2 empty blocks to reorg out the current tip (labeled tip-1 in |
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# diagram above). |
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# This would cause tx2 to be added back to the mempool, which in turn causes |
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# tx3 to be removed. |
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tip = int(self.nodes[0].getblockhash(self.nodes[0].getblockcount()-1), 16) |
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height = self.nodes[0].getblockcount() |
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for i in range(2): |
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block = create_block(tip, create_coinbase(height), cur_time) |
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block.nVersion = 3 |
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block.rehash() |
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block.solve() |
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tip = block.sha256 |
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height += 1 |
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self.nodes[0].submitblock(ToHex(block)) |
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cur_time += 1 |
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mempool = self.nodes[0].getrawmempool() |
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assert(tx3.hash not in mempool) |
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assert(tx2.hash in mempool) |
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# Reset the chain and get rid of the mocktimed-blocks |
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self.nodes[0].setmocktime(0) |
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self.nodes[0].invalidateblock(self.nodes[0].getblockhash(cur_height+1)) |
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self.nodes[0].generate(10) |
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# Make sure that BIP68 isn't being used to validate blocks, prior to |
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# versionbits activation. If more blocks are mined prior to this test |
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# being run, then it's possible the test has activated the soft fork, and |
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# this test should be moved to run earlier, or deleted. |
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def test_bip68_not_consensus(self): |
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assert(get_bip9_status(self.nodes[0], 'csv')['status'] != 'active') |
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txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 2) |
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tx1 = FromHex(CTransaction(), self.nodes[0].getrawtransaction(txid)) |
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tx1.rehash() |
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# Make an anyone-can-spend transaction |
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tx2 = CTransaction() |
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tx2.nVersion = 1 |
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tx2.vin = [CTxIn(COutPoint(tx1.sha256, 0), nSequence=0)] |
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tx2.vout = [CTxOut(int(tx1.vout[0].nValue - self.relayfee*COIN), CScript([b'a']))] |
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# sign tx2 |
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tx2_raw = self.nodes[0].signrawtransaction(ToHex(tx2))["hex"] |
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tx2 = FromHex(tx2, tx2_raw) |
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tx2.rehash() |
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self.nodes[0].sendrawtransaction(ToHex(tx2)) |
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# Now make an invalid spend of tx2 according to BIP68 |
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sequence_value = 100 # 100 block relative locktime |
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tx3 = CTransaction() |
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tx3.nVersion = 2 |
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tx3.vin = [CTxIn(COutPoint(tx2.sha256, 0), nSequence=sequence_value)] |
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tx3.vout = [CTxOut(int(tx2.vout[0].nValue - self.relayfee*COIN), CScript([b'a']))] |
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tx3.rehash() |
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try: |
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self.nodes[0].sendrawtransaction(ToHex(tx3)) |
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except JSONRPCException as exp: |
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assert_equal(exp.error["message"], NOT_FINAL_ERROR) |
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else: |
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assert(False) |
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# make a block that violates bip68; ensure that the tip updates |
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tip = int(self.nodes[0].getbestblockhash(), 16) |
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block = create_block(tip, create_coinbase(self.nodes[0].getblockcount()+1)) |
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block.nVersion = 3 |
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block.vtx.extend([tx1, tx2, tx3]) |
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block.hashMerkleRoot = block.calc_merkle_root() |
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block.rehash() |
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block.solve() |
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self.nodes[0].submitblock(ToHex(block)) |
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assert_equal(self.nodes[0].getbestblockhash(), block.hash) |
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def activateCSV(self): |
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# activation should happen at block height 432 (3 periods) |
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min_activation_height = 432 |
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height = self.nodes[0].getblockcount() |
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assert(height < 432) |
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self.nodes[0].generate(432-height) |
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assert(get_bip9_status(self.nodes[0], 'csv')['status'] == 'active') |
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sync_blocks(self.nodes) |
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# Use self.nodes[1] to test standardness relay policy |
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def test_version2_relay(self, before_activation): |
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inputs = [ ] |
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outputs = { self.nodes[1].getnewaddress() : 1.0 } |
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rawtx = self.nodes[1].createrawtransaction(inputs, outputs) |
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rawtxfund = self.nodes[1].fundrawtransaction(rawtx)['hex'] |
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tx = FromHex(CTransaction(), rawtxfund) |
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tx.nVersion = 2 |
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tx_signed = self.nodes[1].signrawtransaction(ToHex(tx))["hex"] |
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try: |
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tx_id = self.nodes[1].sendrawtransaction(tx_signed) |
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assert(before_activation == False) |
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except: |
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assert(before_activation) |
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if __name__ == '__main__': |
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BIP68Test().main()
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