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Merge #9189: Always add default_witness_commitment with GBT client support

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95f4a03 [qa] Test getblocktemplate default_witness_commitment (Suhas Daftuar)
ad04d1c Always add default_witness_commitment with GBT client support (Pieter Wuille)
This commit is contained in:
Wladimir J. van der Laan 2016-11-25 08:25:30 +01:00
commit d932159f34
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GPG Key ID: 74810B012346C9A6
4 changed files with 51 additions and 31 deletions
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60
qa/rpc-tests/p2p-segwit.py
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@ -195,11 +195,6 @@ class SegWitTest(BitcoinTestFramework):
self.setup_clean_chain = True
self.num_nodes = 3
def add_options(self, parser):
parser.add_option("--oldbinary", dest="oldbinary",
default=None,
help="pre-segwit bitcoind binary for upgrade testing")
def setup_network(self):
self.nodes = []
self.nodes.append(start_node(0, self.options.tmpdir, ["-debug", "-logtimemicros=1", "-whitelist=127.0.0.1"]))
@ -207,12 +202,9 @@ class SegWitTest(BitcoinTestFramework):
self.nodes.append(start_node(1, self.options.tmpdir, ["-debug", "-logtimemicros=1", "-whitelist=127.0.0.1", "-acceptnonstdtxn=0"]))
connect_nodes(self.nodes[0], 1)
# If an old bitcoind is given, do the upgrade-after-activation test.
self.test_upgrade = False
if (self.options.oldbinary != None):
self.nodes.append(start_node(2, self.options.tmpdir, ["-debug", "-whitelist=127.0.0.1"], binary=self.options.oldbinary))
# Disable segwit's bip9 parameter to simulate upgrading after activation.
self.nodes.append(start_node(2, self.options.tmpdir, ["-debug", "-whitelist=127.0.0.1", "-bip9params=segwit:0:0"]))
connect_nodes(self.nodes[0], 2)
self.test_upgrade = True
''' Helpers '''
# Build a block on top of node0's tip.
@ -1177,7 +1169,7 @@ class SegWitTest(BitcoinTestFramework):
if segwit_activated:
# tx and tx2 were both accepted. Don't bother trying to reclaim the
# P2PKH output; just send tx's first output back to an anyone-can-spend.
sync_mempools(self.nodes)
sync_mempools([self.nodes[0], self.nodes[1]])
tx3.vin = [CTxIn(COutPoint(tx.sha256, 0), b"")]
tx3.vout = [CTxOut(tx.vout[0].nValue-1000, CScript([OP_TRUE]))]
tx3.wit.vtxinwit.append(CTxInWitness())
@ -1706,19 +1698,53 @@ class SegWitTest(BitcoinTestFramework):
def test_getblocktemplate_before_lockin(self):
print("\tTesting getblocktemplate setting of segwit versionbit (before lockin)")
block_version = (self.nodes[0].getblocktemplate())['version']
# Node0 is segwit aware, node2 is not.
for node in [self.nodes[0], self.nodes[2]]:
gbt_results = node.getblocktemplate()
block_version = gbt_results['version']
# If we're not indicating segwit support, we should not be signalling
# for segwit activation, nor should we get a witness commitment.
assert_equal(block_version & (1 << VB_WITNESS_BIT), 0)
assert('default_witness_commitment' not in gbt_results)
# Workaround:
# Can either change the tip, or change the mempool and wait 5 seconds
# to trigger a recomputation of getblocktemplate.
self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 1)
txid = int(self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 1), 16)
# Using mocktime lets us avoid sleep()
sync_mempools(self.nodes)
self.nodes[0].setmocktime(int(time.time())+10)
self.nodes[2].setmocktime(int(time.time())+10)
block_version = self.nodes[0].getblocktemplate({"rules" : ["segwit"]})['version']
for node in [self.nodes[0], self.nodes[2]]:
gbt_results = node.getblocktemplate({"rules" : ["segwit"]})
block_version = gbt_results['version']
if node == self.nodes[2]:
# If this is a non-segwit node, we should still not get a witness
# commitment, nor a version bit signalling segwit.
assert_equal(block_version & (1 << VB_WITNESS_BIT), 0)
assert('default_witness_commitment' not in gbt_results)
else:
# For segwit-aware nodes, check the version bit and the witness
# commitment are correct.
assert(block_version & (1 << VB_WITNESS_BIT) != 0)
self.nodes[0].setmocktime(0) # undo mocktime
assert('default_witness_commitment' in gbt_results)
witness_commitment = gbt_results['default_witness_commitment']
# TODO: this duplicates some code from blocktools.py, would be nice
# to refactor.
# Check that default_witness_commitment is present.
block = CBlock()
witness_root = block.get_merkle_root([ser_uint256(0), ser_uint256(txid)])
check_commitment = uint256_from_str(hash256(ser_uint256(witness_root)+ser_uint256(0)))
from test_framework.blocktools import WITNESS_COMMITMENT_HEADER
output_data = WITNESS_COMMITMENT_HEADER + ser_uint256(check_commitment)
script = CScript([OP_RETURN, output_data])
assert_equal(witness_commitment, bytes_to_hex_str(script))
# undo mocktime
self.nodes[0].setmocktime(0)
self.nodes[2].setmocktime(0)
# Uncompressed pubkeys are no longer supported in default relay policy,
# but (for now) are still valid in blocks.
@ -1958,6 +1984,7 @@ class SegWitTest(BitcoinTestFramework):
# Advance to segwit being 'started'
self.advance_to_segwit_started()
sync_blocks(self.nodes)
self.test_getblocktemplate_before_lockin()
sync_blocks(self.nodes)
@ -2000,10 +2027,7 @@ class SegWitTest(BitcoinTestFramework):
self.test_signature_version_1()
self.test_non_standard_witness()
sync_blocks(self.nodes)
if self.test_upgrade:
self.test_upgrade_after_activation(self.nodes[2], 2)
else:
print("\tSkipping upgrade-after-activation test (use --oldbinary to enable)")
self.test_witness_sigops()

9
src/main.cpp
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@ -3511,15 +3511,8 @@ std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBloc
{
std::vector<unsigned char> commitment;
int commitpos = GetWitnessCommitmentIndex(block);
bool fHaveWitness = false;
for (size_t t = 1; t < block.vtx.size(); t++) {
if (!block.vtx[t]->wit.IsNull()) {
fHaveWitness = true;
break;
}
}
std::vector<unsigned char> ret(32, 0x00);
if (fHaveWitness && IsWitnessEnabled(pindexPrev, consensusParams)) {
if (consensusParams.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout != 0) {
if (commitpos == -1) {
uint256 witnessroot = BlockWitnessMerkleRoot(block, NULL);
CHash256().Write(witnessroot.begin(), 32).Write(&ret[0], 32).Finalize(witnessroot.begin());

4
src/rpc/mining.cpp
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@ -680,7 +680,9 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
result.push_back(Pair("curtime", pblock->GetBlockTime()));
result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight+1)));
if (!pblocktemplate->vchCoinbaseCommitment.empty()) {
const struct BIP9DeploymentInfo& segwit_info = VersionBitsDeploymentInfo[Consensus::DEPLOYMENT_SEGWIT];
if (!pblocktemplate->vchCoinbaseCommitment.empty() && setClientRules.find(segwit_info.name) != setClientRules.end()) {
result.push_back(Pair("default_witness_commitment", HexStr(pblocktemplate->vchCoinbaseCommitment.begin(), pblocktemplate->vchCoinbaseCommitment.end())));
}

1
src/test/miner_tests.cpp
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@ -214,6 +214,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
txCoinbase.vin[0].scriptSig = CScript();
txCoinbase.vin[0].scriptSig.push_back(blockinfo[i].extranonce);
txCoinbase.vin[0].scriptSig.push_back(chainActive.Height());
txCoinbase.vout.resize(1); // Ignore the (optional) segwit commitment added by CreateNewBlock (as the hardcoded nonces don't account for this)
txCoinbase.vout[0].scriptPubKey = CScript();
pblock->vtx[0] = MakeTransactionRef(std::move(txCoinbase));
if (txFirst.size() == 0)