highperfocused/bitcoin
1
0
Fork 0
mirror of https://github.com/bitcoin/bitcoin.git synced 2026-01-20 07:09:15 +01:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #6934

Browse Source 
d1c3762 Revert "Revert "Enable policy enforcing GetMedianTimePast as the end point of lock-time constraints"" (Gregory Maxwell)
e4e5334 Restore MedianTimePast for locktime. (Gregory Maxwell)
This commit is contained in:
Wladimir J. van der Laan
2015-11-05 12:12:50 +01:00
parent 3694b74fa9 d1c3762ae8
commit 3038eb63e8
6 changed files with 58 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
src/main.cpp
View File

@@ -650,10 +650,35 @@ bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime)
return true;
}
bool CheckFinalTx(const CTransaction &tx)
bool CheckFinalTx(const CTransaction &tx, int flags)
{
AssertLockHeld(cs_main);
return IsFinalTx(tx, chainActive.Height() + 1, GetAdjustedTime());
// By convention a negative value for flags indicates that the
// current network-enforced consensus rules should be used. In
// a future soft-fork scenario that would mean checking which
// rules would be enforced for the next block and setting the
// appropriate flags. At the present time no soft-forks are
// scheduled, so no flags are set.
flags = std::max(flags, 0);
// CheckFinalTx() uses chainActive.Height()+1 to evaluate
// nLockTime because when IsFinalTx() is called within
// CBlock::AcceptBlock(), the height of the block *being*
// evaluated is what is used. Thus if we want to know if a
// transaction can be part of the *next* block, we need to call
// IsFinalTx() with one more than chainActive.Height().
const int nBlockHeight = chainActive.Height() + 1;
// Timestamps on the other hand don't get any special treatment,
// because we can't know what timestamp the next block will have,
// and there aren't timestamp applications where it matters.
// However this changes once median past time-locks are enforced:
const int64_t nBlockTime = (flags & LOCKTIME_MEDIAN_TIME_PAST)
? chainActive.Tip()->GetMedianTimePast()
: GetAdjustedTime();
return IsFinalTx(tx, nBlockHeight, nBlockTime);
}
unsigned int GetLegacySigOpCount(const CTransaction& tx)
@@ -797,7 +822,7 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
// Only accept nLockTime-using transactions that can be mined in the next
// block; we don't want our mempool filled up with transactions that can't
// be mined yet.
if (!CheckFinalTx(tx))
if (!CheckFinalTx(tx, STANDARD_LOCKTIME_VERIFY_FLAGS))
return state.DoS(0, false, REJECT_NONSTANDARD, "non-final");
// is it already in the memory pool?
@@ -2723,10 +2748,15 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIn
const Consensus::Params& consensusParams = Params().GetConsensus();
// Check that all transactions are finalized
BOOST_FOREACH(const CTransaction& tx, block.vtx)
if (!IsFinalTx(tx, nHeight, block.GetBlockTime())) {
BOOST_FOREACH(const CTransaction& tx, block.vtx) {
int nLockTimeFlags = 0;
int64_t nLockTimeCutoff = (nLockTimeFlags & LOCKTIME_MEDIAN_TIME_PAST)
? pindexPrev->GetMedianTimePast()
: block.GetBlockTime();
if (!IsFinalTx(tx, nHeight, nLockTimeCutoff)) {
return state.DoS(10, error("%s: contains a non-final transaction", __func__), REJECT_INVALID, "bad-txns-nonfinal");
}
}
// Enforce block.nVersion=2 rule that the coinbase starts with serialized block height
// if 750 of the last 1,000 blocks are version 2 or greater (51/100 if testnet):