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Implement SequenceLocks functions

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SequenceLocks functions are used to evaluate sequence lock times or heights per BIP 68.

The majority of this code is copied from maaku in #6312
Further credit: btcdrak, sipa, NicolasDorier
This commit is contained in:
Alex Morcos
2015-12-07 15:44:16 -05:00
parent dc0305d15a
commit c6c2f0fd78
10 changed files with 300 additions and 49 deletions
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2
src/primitives/transaction.cpp
View File

@@ -37,7 +37,7 @@ std::string CTxIn::ToString() const
str += strprintf(", coinbase %s", HexStr(scriptSig));
else
str += strprintf(", scriptSig=%s", HexStr(scriptSig).substr(0, 24));
if (nSequence != std::numeric_limits<unsigned int>::max())
if (nSequence != SEQUENCE_FINAL)
str += strprintf(", nSequence=%u", nSequence);
str += ")";
return str;

38
src/primitives/transaction.h
View File

@@ -61,13 +61,40 @@ public:
CScript scriptSig;
uint32_t nSequence;
/* Setting nSequence to this value for every input in a transaction
* disables nLockTime. */
static const uint32_t SEQUENCE_FINAL = 0xffffffff;
/* Below flags apply in the context of BIP 68*/
/* If this flag set, CTxIn::nSequence is NOT interpreted as a
* relative lock-time. */
static const uint32_t SEQUENCE_LOCKTIME_DISABLE_FLAG = (1 << 31);
/* If CTxIn::nSequence encodes a relative lock-time and this flag
* is set, the relative lock-time has units of 512 seconds,
* otherwise it specifies blocks with a granularity of 1. */
static const uint32_t SEQUENCE_LOCKTIME_TYPE_FLAG = (1 << 22);
/* If CTxIn::nSequence encodes a relative lock-time, this mask is
* applied to extract that lock-time from the sequence field. */
static const uint32_t SEQUENCE_LOCKTIME_MASK = 0x0000ffff;
/* In order to use the same number of bits to encode roughly the
* same wall-clock duration, and because blocks are naturally
* limited to occur every 600s on average, the minimum granularity
* for time-based relative lock-time is fixed at 512 seconds.
* Converting from CTxIn::nSequence to seconds is performed by
* multiplying by 512 = 2^9, or equivalently shifting up by
* 9 bits. */
static const int SEQUENCE_LOCKTIME_GRANULARITY = 9;
CTxIn()
{
nSequence = std::numeric_limits<unsigned int>::max();
nSequence = SEQUENCE_FINAL;
}
explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), uint32_t nSequenceIn=std::numeric_limits<unsigned int>::max());
CTxIn(uint256 hashPrevTx, uint32_t nOut, CScript scriptSigIn=CScript(), uint32_t nSequenceIn=std::numeric_limits<uint32_t>::max());
explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), uint32_t nSequenceIn=SEQUENCE_FINAL);
CTxIn(uint256 hashPrevTx, uint32_t nOut, CScript scriptSigIn=CScript(), uint32_t nSequenceIn=SEQUENCE_FINAL);
ADD_SERIALIZE_METHODS;
@@ -78,11 +105,6 @@ public:
READWRITE(nSequence);
}
bool IsFinal() const
{
return (nSequence == std::numeric_limits<uint32_t>::max());
}
friend bool operator==(const CTxIn& a, const CTxIn& b)
{
return (a.prevout == b.prevout &&