Don't require segwit in getblocktemplate for segwit signalling or mining

Segwit's version bit will be signalled for all invocations of CreateNewBlock,
and not specifying segwit only will cause CreateNewBlock to skip transactions
with witness from being selected.
This commit is contained in:
Suhas Daftuar 2017-03-08 15:56:59 -05:00
parent 3cc13eac40
commit abe7b3d3ab
6 changed files with 29 additions and 14 deletions

View file

@ -1698,9 +1698,11 @@ class SegWitTest(BitcoinTestFramework):
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)
# If we're not indicating segwit support, we will still be
# signalling for segwit activation.
assert_equal((block_version & (1 << VB_WITNESS_BIT) != 0), node == self.nodes[0])
# If we don't specify the segwit rule, then we won't get a default
# commitment.
assert('default_witness_commitment' not in gbt_results)
# Workaround:

View file

@ -250,9 +250,12 @@ class SegWitTest(BitcoinTestFramework):
assert(tmpl['transactions'][0]['txid'] == txid)
assert(tmpl['transactions'][0]['sigops'] == 8)
self.log.info("Non-segwit miners are not able to use GBT response after activation.")
send_to_witness(1, self.nodes[0], find_unspent(self.nodes[0], 50), self.pubkey[0], False, Decimal("49.998"))
assert_raises_jsonrpc(-8, "Support for 'segwit' rule requires explicit client support", self.nodes[0].getblocktemplate, {})
self.log.info("Non-segwit miners are able to use GBT response after activation.")
txid = send_to_witness(1, self.nodes[0], find_unspent(self.nodes[0], 50), self.pubkey[0], False, Decimal("49.998"))
#assert_raises_jsonrpc(-8, "Support for 'segwit' rule requires explicit client support", self.nodes[0].getblocktemplate, {})
tmpl = self.nodes[0].getblocktemplate()
# TODO: add a transaction with witness to mempool, and verify it's not
# selected for mining.
self.log.info("Verify behaviour of importaddress, addwitnessaddress and listunspent")

View file

@ -137,7 +137,7 @@ void BlockAssembler::resetBlock()
nFees = 0;
}
std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& scriptPubKeyIn)
std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& scriptPubKeyIn, bool fMineWitnessTx)
{
resetBlock();
@ -175,7 +175,7 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
// -promiscuousmempoolflags is used.
// TODO: replace this with a call to main to assess validity of a mempool
// transaction (which in most cases can be a no-op).
fIncludeWitness = IsWitnessEnabled(pindexPrev, chainparams.GetConsensus());
fIncludeWitness = IsWitnessEnabled(pindexPrev, chainparams.GetConsensus()) && fMineWitnessTx;
addPackageTxs();

View file

@ -170,7 +170,7 @@ public:
BlockAssembler(const CChainParams& params, const Options& options);
/** Construct a new block template with coinbase to scriptPubKeyIn */
std::unique_ptr<CBlockTemplate> CreateNewBlock(const CScript& scriptPubKeyIn);
std::unique_ptr<CBlockTemplate> CreateNewBlock(const CScript& scriptPubKeyIn, bool fMineWitnessTx=true);
private:
// utility functions

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@ -514,12 +514,22 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
// TODO: Maybe recheck connections/IBD and (if something wrong) send an expires-immediately template to stop miners?
}
const struct BIP9DeploymentInfo& segwit_info = VersionBitsDeploymentInfo[Consensus::DEPLOYMENT_SEGWIT];
// If the caller is indicating segwit support, then allow CreateNewBlock()
// to select witness transactions, after segwit activates (otherwise
// don't).
bool fSupportsSegwit = setClientRules.find(segwit_info.name) != setClientRules.end();
// Update block
static CBlockIndex* pindexPrev;
static int64_t nStart;
static std::unique_ptr<CBlockTemplate> pblocktemplate;
// Cache whether the last invocation was with segwit support, to avoid returning
// a segwit-block to a non-segwit caller.
static bool fLastTemplateSupportsSegwit = true;
if (pindexPrev != chainActive.Tip() ||
(mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 5))
(mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 5) ||
fLastTemplateSupportsSegwit != fSupportsSegwit)
{
// Clear pindexPrev so future calls make a new block, despite any failures from here on
pindexPrev = nullptr;
@ -528,10 +538,11 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
CBlockIndex* pindexPrevNew = chainActive.Tip();
nStart = GetTime();
fLastTemplateSupportsSegwit = fSupportsSegwit;
// Create new block
CScript scriptDummy = CScript() << OP_TRUE;
pblocktemplate = BlockAssembler(Params()).CreateNewBlock(scriptDummy);
pblocktemplate = BlockAssembler(Params()).CreateNewBlock(scriptDummy, fSupportsSegwit);
if (!pblocktemplate)
throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");
@ -681,8 +692,7 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight+1)));
const struct BIP9DeploymentInfo& segwit_info = VersionBitsDeploymentInfo[Consensus::DEPLOYMENT_SEGWIT];
if (!pblocktemplate->vchCoinbaseCommitment.empty() && setClientRules.find(segwit_info.name) != setClientRules.end()) {
if (!pblocktemplate->vchCoinbaseCommitment.empty() && fSupportsSegwit) {
result.push_back(Pair("default_witness_commitment", HexStr(pblocktemplate->vchCoinbaseCommitment.begin(), pblocktemplate->vchCoinbaseCommitment.end())));
}

View file

@ -17,7 +17,7 @@ const struct BIP9DeploymentInfo VersionBitsDeploymentInfo[Consensus::MAX_VERSION
},
{
/*.name =*/ "segwit",
/*.gbt_force =*/ false,
/*.gbt_force =*/ true,
}
};