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-rw-r--r--src/main.cpp89
-rw-r--r--src/main.h12
-rw-r--r--src/test/test_bitcoin.cpp2
-rw-r--r--src/test/test_bitcoin.h4
-rw-r--r--src/txmempool.cpp18
-rw-r--r--src/txmempool.h32
6 files changed, 131 insertions, 26 deletions
diff --git a/src/main.cpp b/src/main.cpp
index babdff54ef..525d9902b9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -794,7 +794,25 @@ bool SequenceLocks(const CTransaction &tx, int flags, std::vector<int>* prevHeig
return EvaluateSequenceLocks(block, CalculateSequenceLocks(tx, flags, prevHeights, block));
}
-bool CheckSequenceLocks(const CTransaction &tx, int flags)
+bool TestLockPointValidity(const LockPoints* lp)
+{
+ AssertLockHeld(cs_main);
+ assert(lp);
+ // If there are relative lock times then the maxInputBlock will be set
+ // If there are no relative lock times, the LockPoints don't depend on the chain
+ if (lp->maxInputBlock) {
+ // Check whether chainActive is an extension of the block at which the LockPoints
+ // calculation was valid. If not LockPoints are no longer valid
+ if (!chainActive.Contains(lp->maxInputBlock)) {
+ return false;
+ }
+ }
+
+ // LockPoints still valid
+ return true;
+}
+
+bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp, bool useExistingLockPoints)
{
AssertLockHeld(cs_main);
AssertLockHeld(mempool.cs);
@@ -810,25 +828,57 @@ bool CheckSequenceLocks(const CTransaction &tx, int flags)
// *next* block, we need to use one more than chainActive.Height()
index.nHeight = tip->nHeight + 1;
- // pcoinsTip contains the UTXO set for chainActive.Tip()
- CCoinsViewMemPool viewMemPool(pcoinsTip, mempool);
- std::vector<int> prevheights;
- prevheights.resize(tx.vin.size());
- for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) {
- const CTxIn& txin = tx.vin[txinIndex];
- CCoins coins;
- if (!viewMemPool.GetCoins(txin.prevout.hash, coins)) {
- return error("%s: Missing input", __func__);
+ std::pair<int, int64_t> lockPair;
+ if (useExistingLockPoints) {
+ assert(lp);
+ lockPair.first = lp->height;
+ lockPair.second = lp->time;
+ }
+ else {
+ // pcoinsTip contains the UTXO set for chainActive.Tip()
+ CCoinsViewMemPool viewMemPool(pcoinsTip, mempool);
+ std::vector<int> prevheights;
+ prevheights.resize(tx.vin.size());
+ for (size_t txinIndex = 0; txinIndex < tx.vin.size(); txinIndex++) {
+ const CTxIn& txin = tx.vin[txinIndex];
+ CCoins coins;
+ if (!viewMemPool.GetCoins(txin.prevout.hash, coins)) {
+ return error("%s: Missing input", __func__);
+ }
+ if (coins.nHeight == MEMPOOL_HEIGHT) {
+ // Assume all mempool transaction confirm in the next block
+ prevheights[txinIndex] = tip->nHeight + 1;
+ } else {
+ prevheights[txinIndex] = coins.nHeight;
+ }
}
- if (coins.nHeight == MEMPOOL_HEIGHT) {
- // Assume all mempool transaction confirm in the next block
- prevheights[txinIndex] = tip->nHeight + 1;
- } else {
- prevheights[txinIndex] = coins.nHeight;
+ lockPair = CalculateSequenceLocks(tx, flags, &prevheights, index);
+ if (lp) {
+ lp->height = lockPair.first;
+ lp->time = lockPair.second;
+ // Also store the hash of the block with the highest height of
+ // all the blocks which have sequence locked prevouts.
+ // This hash needs to still be on the chain
+ // for these LockPoint calculations to be valid
+ // Note: It is impossible to correctly calculate a maxInputBlock
+ // if any of the sequence locked inputs depend on unconfirmed txs,
+ // except in the special case where the relative lock time/height
+ // is 0, which is equivalent to no sequence lock. Since we assume
+ // input height of tip+1 for mempool txs and test the resulting
+ // lockPair from CalculateSequenceLocks against tip+1. We know
+ // EvaluateSequenceLocks will fail if there was a non-zero sequence
+ // lock on a mempool input, so we can use the return value of
+ // CheckSequenceLocks to indicate the LockPoints validity
+ int maxInputHeight = 0;
+ BOOST_FOREACH(int height, prevheights) {
+ // Can ignore mempool inputs since we'll fail if they had non-zero locks
+ if (height != tip->nHeight+1) {
+ maxInputHeight = std::max(maxInputHeight, height);
+ }
+ }
+ lp->maxInputBlock = tip->GetAncestor(maxInputHeight);
}
}
-
- std::pair<int, int64_t> lockPair = CalculateSequenceLocks(tx, flags, &prevheights, index);
return EvaluateSequenceLocks(index, lockPair);
}
@@ -1017,6 +1067,7 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
CCoinsViewCache view(&dummy);
CAmount nValueIn = 0;
+ LockPoints lp;
{
LOCK(pool.cs);
CCoinsViewMemPool viewMemPool(pcoinsTip, pool);
@@ -1060,7 +1111,7 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
// be mined yet.
// Must keep pool.cs for this unless we change CheckSequenceLocks to take a
// CoinsViewCache instead of create its own
- if (!CheckSequenceLocks(tx, STANDARD_LOCKTIME_VERIFY_FLAGS))
+ if (!CheckSequenceLocks(tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp))
return state.DoS(0, false, REJECT_NONSTANDARD, "non-BIP68-final");
}
@@ -1092,7 +1143,7 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
}
}
- CTxMemPoolEntry entry(tx, nFees, GetTime(), dPriority, chainActive.Height(), pool.HasNoInputsOf(tx), inChainInputValue, fSpendsCoinbase, nSigOps);
+ CTxMemPoolEntry entry(tx, nFees, GetTime(), dPriority, chainActive.Height(), pool.HasNoInputsOf(tx), inChainInputValue, fSpendsCoinbase, nSigOps, lp);
unsigned int nSize = entry.GetTxSize();
// Check that the transaction doesn't have an excessive number of
diff --git a/src/main.h b/src/main.h
index 5ba2be251c..85ec60ac61 100644
--- a/src/main.h
+++ b/src/main.h
@@ -39,6 +39,7 @@ class CValidationInterface;
class CValidationState;
struct CNodeStateStats;
+struct LockPoints;
/** Default for accepting alerts from the P2P network. */
static const bool DEFAULT_ALERTS = true;
@@ -369,6 +370,11 @@ bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime);
bool CheckFinalTx(const CTransaction &tx, int flags = -1);
/**
+ * Test whether the LockPoints height and time are still valid on the current chain
+ */
+bool TestLockPointValidity(const LockPoints* lp);
+
+/**
* Check if transaction is final per BIP 68 sequence numbers and can be included in a block.
* Consensus critical. Takes as input a list of heights at which tx's inputs (in order) confirmed.
*/
@@ -378,10 +384,14 @@ bool SequenceLocks(const CTransaction &tx, int flags, std::vector<int>* prevHeig
* Check if transaction will be BIP 68 final in the next block to be created.
*
* Simulates calling SequenceLocks() with data from the tip of the current active chain.
+ * Optionally stores in LockPoints the resulting height and time calculated and the hash
+ * of the block needed for calculation or skips the calculation and uses the LockPoints
+ * passed in for evaluation.
+ * The LockPoints should not be considered valid if CheckSequenceLocks returns false.
*
* See consensus/consensus.h for flag definitions.
*/
-bool CheckSequenceLocks(const CTransaction &tx, int flags);
+bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp = NULL, bool useExistingLockPoints = false);
/**
* Closure representing one script verification
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index 0416d0c926..a272018cf1 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -151,7 +151,7 @@ CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(CMutableTransaction &tx, CTxMemPo
CAmount inChainValue = hasNoDependencies ? txn.GetValueOut() : 0;
return CTxMemPoolEntry(txn, nFee, nTime, dPriority, nHeight,
- hasNoDependencies, inChainValue, spendsCoinbase, sigOpCount);
+ hasNoDependencies, inChainValue, spendsCoinbase, sigOpCount, lp);
}
void Shutdown(void* parg)
diff --git a/src/test/test_bitcoin.h b/src/test/test_bitcoin.h
index c623920880..769ae5a132 100644
--- a/src/test/test_bitcoin.h
+++ b/src/test/test_bitcoin.h
@@ -9,6 +9,7 @@
#include "key.h"
#include "pubkey.h"
#include "txdb.h"
+#include "txmempool.h"
#include <boost/filesystem.hpp>
#include <boost/thread.hpp>
@@ -71,7 +72,8 @@ struct TestMemPoolEntryHelper
bool hadNoDependencies;
bool spendsCoinbase;
unsigned int sigOpCount;
-
+ LockPoints lp;
+
TestMemPoolEntryHelper() :
nFee(0), nTime(0), dPriority(0.0), nHeight(1),
hadNoDependencies(false), spendsCoinbase(false), sigOpCount(1) { }
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 0b0f32e406..5f814749b7 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -22,10 +22,10 @@ using namespace std;
CTxMemPoolEntry::CTxMemPoolEntry(const CTransaction& _tx, const CAmount& _nFee,
int64_t _nTime, double _entryPriority, unsigned int _entryHeight,
bool poolHasNoInputsOf, CAmount _inChainInputValue,
- bool _spendsCoinbase, unsigned int _sigOps):
+ bool _spendsCoinbase, unsigned int _sigOps, LockPoints lp):
tx(_tx), nFee(_nFee), nTime(_nTime), entryPriority(_entryPriority), entryHeight(_entryHeight),
hadNoDependencies(poolHasNoInputsOf), inChainInputValue(_inChainInputValue),
- spendsCoinbase(_spendsCoinbase), sigOpCount(_sigOps)
+ spendsCoinbase(_spendsCoinbase), sigOpCount(_sigOps), lockPoints(lp)
{
nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
nModSize = tx.CalculateModifiedSize(nTxSize);
@@ -61,6 +61,11 @@ void CTxMemPoolEntry::UpdateFeeDelta(int64_t newFeeDelta)
feeDelta = newFeeDelta;
}
+void CTxMemPoolEntry::UpdateLockPoints(const LockPoints& lp)
+{
+ lockPoints = lp;
+}
+
// Update the given tx for any in-mempool descendants.
// Assumes that setMemPoolChildren is correct for the given tx and all
// descendants.
@@ -506,7 +511,11 @@ void CTxMemPool::removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMem
list<CTransaction> transactionsToRemove;
for (indexed_transaction_set::const_iterator it = mapTx.begin(); it != mapTx.end(); it++) {
const CTransaction& tx = it->GetTx();
- if (!CheckFinalTx(tx, flags) || !CheckSequenceLocks(tx, flags)) {
+ LockPoints lp = it->GetLockPoints();
+ bool validLP = TestLockPointValidity(&lp);
+ if (!CheckFinalTx(tx, flags) || !CheckSequenceLocks(tx, flags, &lp, validLP)) {
+ // Note if CheckSequenceLocks fails the LockPoints may still be invalid
+ // So it's critical that we remove the tx and not depend on the LockPoints.
transactionsToRemove.push_back(tx);
} else if (it->GetSpendsCoinbase()) {
BOOST_FOREACH(const CTxIn& txin, tx.vin) {
@@ -521,6 +530,9 @@ void CTxMemPool::removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMem
}
}
}
+ if (!validLP) {
+ mapTx.modify(it, update_lock_points(lp));
+ }
}
BOOST_FOREACH(const CTransaction& tx, transactionsToRemove) {
list<CTransaction> removed;
diff --git a/src/txmempool.h b/src/txmempool.h
index 386cb26d25..5997346b02 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -19,6 +19,7 @@
#include "boost/multi_index/ordered_index.hpp"
class CAutoFile;
+class CBlockIndex;
inline double AllowFreeThreshold()
{
@@ -35,6 +36,21 @@ inline bool AllowFree(double dPriority)
/** Fake height value used in CCoins to signify they are only in the memory pool (since 0.8) */
static const unsigned int MEMPOOL_HEIGHT = 0x7FFFFFFF;
+struct LockPoints
+{
+ // Will be set to the blockchain height and median time past
+ // values that would be necessary to satisfy all relative locktime
+ // constraints (BIP68) of this tx given our view of block chain history
+ int height;
+ int64_t time;
+ // As long as the current chain descends from the highest height block
+ // containing one of the inputs used in the calculation, then the cached
+ // values are still valid even after a reorg.
+ CBlockIndex* maxInputBlock;
+
+ LockPoints() : height(0), time(0), maxInputBlock(NULL) { }
+};
+
class CTxMemPool;
/** \class CTxMemPoolEntry
@@ -70,6 +86,7 @@ private:
bool spendsCoinbase; //! keep track of transactions that spend a coinbase
unsigned int sigOpCount; //! Legacy sig ops plus P2SH sig op count
int64_t feeDelta; //! Used for determining the priority of the transaction for mining in a block
+ LockPoints lockPoints; //! Track the height and time at which tx was final
// Information about descendants of this transaction that are in the
// mempool; if we remove this transaction we must remove all of these
@@ -84,7 +101,7 @@ public:
CTxMemPoolEntry(const CTransaction& _tx, const CAmount& _nFee,
int64_t _nTime, double _entryPriority, unsigned int _entryHeight,
bool poolHasNoInputsOf, CAmount _inChainInputValue, bool spendsCoinbase,
- unsigned int nSigOps);
+ unsigned int nSigOps, LockPoints lp);
CTxMemPoolEntry(const CTxMemPoolEntry& other);
const CTransaction& GetTx() const { return this->tx; }
@@ -101,12 +118,15 @@ public:
unsigned int GetSigOpCount() const { return sigOpCount; }
int64_t GetModifiedFee() const { return nFee + feeDelta; }
size_t DynamicMemoryUsage() const { return nUsageSize; }
+ const LockPoints& GetLockPoints() const { return lockPoints; }
// Adjusts the descendant state, if this entry is not dirty.
void UpdateState(int64_t modifySize, CAmount modifyFee, int64_t modifyCount);
// Updates the fee delta used for mining priority score, and the
// modified fees with descendants.
void UpdateFeeDelta(int64_t feeDelta);
+ // Update the LockPoints after a reorg
+ void UpdateLockPoints(const LockPoints& lp);
/** We can set the entry to be dirty if doing the full calculation of in-
* mempool descendants will be too expensive, which can potentially happen
@@ -154,6 +174,16 @@ private:
int64_t feeDelta;
};
+struct update_lock_points
+{
+ update_lock_points(const LockPoints& _lp) : lp(_lp) { }
+
+ void operator() (CTxMemPoolEntry &e) { e.UpdateLockPoints(lp); }
+
+private:
+ const LockPoints& lp;
+};
+
// extracts a TxMemPoolEntry's transaction hash
struct mempoolentry_txid
{
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-02 16:16:53 +0000