Remove member variable hadNoDependencies from CTxMemPoolEntry

Fee estimation can just check its own mapMemPoolTxs to determine the same information.  Note that now fee estimation for block processing must happen before those transactions are removed, but this shoudl be a speedup.

Author: morcos

src/bench/mempool_eviction.cpp

@@ -18,7 +18,7 @@ static void AddTx(const CTransaction& tx, const CAmount& nFee, CTxMemPool& pool)
     unsigned int sigOpCost = 4;
     LockPoints lp;
     pool.addUnchecked(tx.GetHash(), CTxMemPoolEntry(
-                                        MakeTransactionRef(tx), nFee, nTime, dPriority, nHeight, pool.HasNoInputsOf(tx),
+                                        MakeTransactionRef(tx), nFee, nTime, dPriority, nHeight,
                                         tx.GetValueOut(), spendsCoinbase, sigOpCost, lp));
 }
 

src/policy/fees.cpp

@@ -327,13 +327,6 @@ void CBlockPolicyEstimator::processTransaction(const CTxMemPoolEntry& entry, boo
     if (!fCurrentEstimate)
         return;
 
-    if (!entry.WasClearAtEntry()) {
-        // This transaction depends on other transactions in the mempool to
-        // be included in a block before it will be able to be included, so
-        // we shouldn't include it in our calculations
-        return;
-    }
-
     // Feerates are stored and reported as BTC-per-kb:
     CFeeRate feeRate(entry.GetFee(), entry.GetTxSize());
 
@@ -343,10 +336,8 @@ void CBlockPolicyEstimator::processTransaction(const CTxMemPoolEntry& entry, boo
 
 void CBlockPolicyEstimator::processBlockTx(unsigned int nBlockHeight, const CTxMemPoolEntry& entry)
 {
-    if (!entry.WasClearAtEntry()) {
-        // This transaction depended on other transactions in the mempool to
-        // be included in a block before it was able to be included, so
-        // we shouldn't include it in our calculations
+    if (!removeTx(entry.GetTx().GetHash())) {
+        // This transaction wasn't being tracked for fee estimation
         return;
     }
 
@@ -378,14 +369,18 @@ void CBlockPolicyEstimator::processBlock(unsigned int nBlockHeight,
         // transaction fees."
         return;
     }
-    nBestSeenHeight = nBlockHeight;
 
     // Only want to be updating estimates when our blockchain is synced,
     // otherwise we'll miscalculate how many blocks its taking to get included.
     if (!fCurrentEstimate)
         return;
 
-    // Clear the current block state
+    // Must update nBestSeenHeight in sync with ClearCurrent so that
+    // calls to removeTx (via processBlockTx) correctly calculate age
+    // of unconfirmed txs to remove from tracking.
+    nBestSeenHeight = nBlockHeight;
+
+    // Clear the current block state and update unconfirmed circular buffer
     feeStats.ClearCurrent(nBlockHeight);
 
     // Repopulate the current block states

src/test/mempool_tests.cpp

@@ -120,7 +120,6 @@ BOOST_AUTO_TEST_CASE(MempoolIndexingTest)
 {
     CTxMemPool pool(CFeeRate(0));
     TestMemPoolEntryHelper entry;
-    entry.hadNoDependencies = true;
 
     /* 3rd highest fee */
     CMutableTransaction tx1 = CMutableTransaction();
@@ -323,7 +322,6 @@ BOOST_AUTO_TEST_CASE(MempoolAncestorIndexingTest)
 {
     CTxMemPool pool(CFeeRate(0));
     TestMemPoolEntryHelper entry;
-    entry.hadNoDependencies = true;
 
     /* 3rd highest fee */
     CMutableTransaction tx1 = CMutableTransaction();

src/test/test_bitcoin.cpp

@@ -147,12 +147,11 @@ CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CMutableTransaction &tx, CT
 }
 
 CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CTransaction &txn, CTxMemPool *pool) {
-    bool hasNoDependencies = pool ? pool->HasNoInputsOf(txn) : hadNoDependencies;
     // Hack to assume either its completely dependent on other mempool txs or not at all
-    CAmount inChainValue = hasNoDependencies ? txn.GetValueOut() : 0;
+    CAmount inChainValue = pool && pool->HasNoInputsOf(txn) ? txn.GetValueOut() : 0;
 
     return CTxMemPoolEntry(MakeTransactionRef(txn), nFee, nTime, dPriority, nHeight,
-                           hasNoDependencies, inChainValue, spendsCoinbase, sigOpCost, lp);
+                           inChainValue, spendsCoinbase, sigOpCost, lp);
 }
 
 void Shutdown(void* parg)

src/test/test_bitcoin.h

@@ -70,14 +70,13 @@ struct TestMemPoolEntryHelper
     int64_t nTime;
     double dPriority;
     unsigned int nHeight;
-    bool hadNoDependencies;
     bool spendsCoinbase;
     unsigned int sigOpCost;
     LockPoints lp;
 
     TestMemPoolEntryHelper() :
         nFee(0), nTime(0), dPriority(0.0), nHeight(1),
-        hadNoDependencies(false), spendsCoinbase(false), sigOpCost(4) { }
+        spendsCoinbase(false), sigOpCost(4) { }
 
     CTxMemPoolEntry FromTx(const CMutableTransaction &tx, CTxMemPool *pool = NULL);
     CTxMemPoolEntry FromTx(const CTransaction &tx, CTxMemPool *pool = NULL);
@@ -87,7 +86,6 @@ struct TestMemPoolEntryHelper
     TestMemPoolEntryHelper &Time(int64_t _time) { nTime = _time; return *this; }
     TestMemPoolEntryHelper &Priority(double _priority) { dPriority = _priority; return *this; }
     TestMemPoolEntryHelper &Height(unsigned int _height) { nHeight = _height; return *this; }
-    TestMemPoolEntryHelper &HadNoDependencies(bool _hnd) { hadNoDependencies = _hnd; return *this; }
     TestMemPoolEntryHelper &SpendsCoinbase(bool _flag) { spendsCoinbase = _flag; return *this; }
     TestMemPoolEntryHelper &SigOpsCost(unsigned int _sigopsCost) { sigOpCost = _sigopsCost; return *this; }
 };

src/txmempool.cpp

@@ -22,10 +22,10 @@ using namespace std;
 
 CTxMemPoolEntry::CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
                                  int64_t _nTime, double _entryPriority, unsigned int _entryHeight,
-                                 bool poolHasNoInputsOf, CAmount _inChainInputValue,
+                                 CAmount _inChainInputValue,
                                  bool _spendsCoinbase, int64_t _sigOpsCost, LockPoints lp):
     tx(_tx), nFee(_nFee), nTime(_nTime), entryPriority(_entryPriority), entryHeight(_entryHeight),
-    hadNoDependencies(poolHasNoInputsOf), inChainInputValue(_inChainInputValue),
+    inChainInputValue(_inChainInputValue),
     spendsCoinbase(_spendsCoinbase), sigOpCost(_sigOpsCost), lockPoints(lp)
 {
     nTxWeight = GetTransactionWeight(*tx);
@@ -604,6 +604,8 @@ void CTxMemPool::removeForBlock(const std::vector<CTransactionRef>& vtx, unsigne
         if (i != mapTx.end())
             entries.push_back(*i);
     }
+    // Before the txs in the new block have been removed from the mempool, update policy estimates
+    minerPolicyEstimator->processBlock(nBlockHeight, entries, fCurrentEstimate);
     for (const auto& tx : vtx)
     {
         txiter it = mapTx.find(tx->GetHash());
@@ -615,8 +617,6 @@ void CTxMemPool::removeForBlock(const std::vector<CTransactionRef>& vtx, unsigne
         removeConflicts(*tx);
         ClearPrioritisation(tx->GetHash());
     }
-    // After the txs in the new block have been removed from the mempool, update policy estimates
-    minerPolicyEstimator->processBlock(nBlockHeight, entries, fCurrentEstimate);
     lastRollingFeeUpdate = GetTime();
     blockSinceLastRollingFeeBump = true;
 }

src/txmempool.h

@@ -88,7 +88,6 @@ class CTxMemPoolEntry
     int64_t nTime;             //!< Local time when entering the mempool
     double entryPriority;      //!< Priority when entering the mempool
     unsigned int entryHeight;  //!< Chain height when entering the mempool
-    bool hadNoDependencies;    //!< Not dependent on any other txs when it entered the mempool
     CAmount inChainInputValue; //!< Sum of all txin values that are already in blockchain
     bool spendsCoinbase;       //!< keep track of transactions that spend a coinbase
     int64_t sigOpCost;         //!< Total sigop cost
@@ -113,7 +112,7 @@ class CTxMemPoolEntry
 public:
     CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
                     int64_t _nTime, double _entryPriority, unsigned int _entryHeight,
-                    bool poolHasNoInputsOf, CAmount _inChainInputValue, bool spendsCoinbase,
+                    CAmount _inChainInputValue, bool spendsCoinbase,
                     int64_t nSigOpsCost, LockPoints lp);
 
     CTxMemPoolEntry(const CTxMemPoolEntry& other);
@@ -130,7 +129,6 @@ class CTxMemPoolEntry
     size_t GetTxWeight() const { return nTxWeight; }
     int64_t GetTime() const { return nTime; }
     unsigned int GetHeight() const { return entryHeight; }
-    bool WasClearAtEntry() const { return hadNoDependencies; }
     int64_t GetSigOpCost() const { return sigOpCost; }
     int64_t GetModifiedFee() const { return nFee + feeDelta; }
     size_t DynamicMemoryUsage() const { return nUsageSize; }

src/validation.cpp

@@ -693,7 +693,6 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
         }
 
         CTxMemPoolEntry entry(ptx, nFees, nAcceptTime, dPriority, chainActive.Height(),
-                              !IsInitialBlockDownload() && pool.HasNoInputsOf(tx),
                               inChainInputValue, fSpendsCoinbase, nSigOpsCost, lp);
         unsigned int nSize = entry.GetTxSize();
 
@@ -943,7 +942,7 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
         pool.RemoveStaged(allConflicting, false);
 
         // Store transaction in memory
-        pool.addUnchecked(hash, entry, setAncestors, !IsInitialBlockDownload());
+        pool.addUnchecked(hash, entry, setAncestors, !IsInitialBlockDownload() && pool.HasNoInputsOf(tx));
 
         // trim mempool and check if tx was trimmed
         if (!fOverrideMempoolLimit) {

src/wallet/wallet.cpp

@@ -2563,7 +2563,7 @@ bool CWallet::CreateTransaction(const vector<CRecipient>& vecSend, CWalletTx& wt
     if (GetBoolArg("-walletrejectlongchains", DEFAULT_WALLET_REJECT_LONG_CHAINS)) {
         // Lastly, ensure this tx will pass the mempool's chain limits
         LockPoints lp;
-        CTxMemPoolEntry entry(wtxNew.tx, 0, 0, 0, 0, false, 0, false, 0, lp);
+        CTxMemPoolEntry entry(wtxNew.tx, 0, 0, 0, 0, 0, false, 0, lp);
         CTxMemPool::setEntries setAncestors;
         size_t nLimitAncestors = GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
         size_t nLimitAncestorSize = GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000;