Track coinbase spends in CTxMemPoolEntry

This allows us to optimize CTxMemPool::removeForReorg.

src/main.cpp

@@ -953,7 +953,18 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
         CAmount inChainInputValue;
         double dPriority = view.GetPriority(tx, chainActive.Height(), inChainInputValue);
 
-        CTxMemPoolEntry entry(tx, nFees, GetTime(), dPriority, chainActive.Height(), pool.HasNoInputsOf(tx), inChainInputValue);
+        // Keep track of transactions that spend a coinbase, which we re-scan
+        // during reorgs to ensure COINBASE_MATURITY is still met.
+        bool fSpendsCoinbase = false;
+        BOOST_FOREACH(const CTxIn &txin, tx.vin) {
+            const CCoins *coins = view.AccessCoins(txin.prevout.hash);
+            if (coins->IsCoinBase()) {
+                fSpendsCoinbase = true;
+                break;
+            }
+        }
+
+        CTxMemPoolEntry entry(tx, nFees, GetTime(), dPriority, chainActive.Height(), pool.HasNoInputsOf(tx), inChainInputValue, fSpendsCoinbase);
         unsigned int nSize = entry.GetTxSize();
 
         // Don't accept it if it can't get into a block

src/test/miner_tests.cpp

@@ -119,7 +119,8 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     {
         tx.vout[0].nValue -= 1000000;
         hash = tx.GetHash();
-        mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+        bool spendsCoinbase = (i == 0) ? true : false; // only first tx spends coinbase
+        mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(spendsCoinbase).FromTx(tx));
         tx.vin[0].prevout.hash = hash;
     }
     BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
@@ -139,7 +140,8 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     {
         tx.vout[0].nValue -= 10000000;
         hash = tx.GetHash();
-        mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+        bool spendsCoinbase = (i == 0) ? true : false; // only first tx spends coinbase
+        mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(spendsCoinbase).FromTx(tx));
         tx.vin[0].prevout.hash = hash;
     }
     BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
@@ -158,7 +160,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vin[0].prevout.hash = txFirst[1]->GetHash();
     tx.vout[0].nValue = 4900000000LL;
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
     tx.vin[0].prevout.hash = hash;
     tx.vin.resize(2);
     tx.vin[1].scriptSig = CScript() << OP_1;
@@ -166,7 +168,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vin[1].prevout.n = 0;
     tx.vout[0].nValue = 5900000000LL;
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
     BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
     delete pblocktemplate;
     mempool.clear();
@@ -177,7 +179,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vin[0].scriptSig = CScript() << OP_0 << OP_1;
     tx.vout[0].nValue = 0;
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(false).FromTx(tx));
     BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
     delete pblocktemplate;
     mempool.clear();
@@ -190,12 +192,12 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     script = CScript() << OP_0;
     tx.vout[0].scriptPubKey = GetScriptForDestination(CScriptID(script));
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
     tx.vin[0].prevout.hash = hash;
     tx.vin[0].scriptSig = CScript() << (std::vector<unsigned char>)script;
     tx.vout[0].nValue -= 1000000;
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(false).FromTx(tx));
     BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
     delete pblocktemplate;
     mempool.clear();
@@ -206,10 +208,10 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vout[0].nValue = 4900000000LL;
     tx.vout[0].scriptPubKey = CScript() << OP_1;
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
     tx.vout[0].scriptPubKey = CScript() << OP_2;
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
     BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
     delete pblocktemplate;
     mempool.clear();
@@ -235,7 +237,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vout[0].scriptPubKey = CScript() << OP_1;
     tx.nLockTime = chainActive.Tip()->nHeight+1;
     hash = tx.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
     BOOST_CHECK(!CheckFinalTx(tx, LOCKTIME_MEDIAN_TIME_PAST));
 
     // time locked
@@ -249,7 +251,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx2.vout[0].scriptPubKey = CScript() << OP_1;
     tx2.nLockTime = chainActive.Tip()->GetMedianTimePast()+1;
     hash = tx2.GetHash();
-    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx2));
+    mempool.addUnchecked(hash, entry.Time(GetTime()).SpendsCoinbase(true).FromTx(tx2));
     BOOST_CHECK(!CheckFinalTx(tx2, LOCKTIME_MEDIAN_TIME_PAST));
 
     BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));

src/test/test_bitcoin.cpp

@@ -150,7 +150,7 @@ CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(CMutableTransaction &tx, CTxMemPo
     CAmount inChainValue = hasNoDependencies ? txn.GetValueOut() : 0;
 
     return CTxMemPoolEntry(txn, nFee, nTime, dPriority, nHeight,
-                           hasNoDependencies, inChainValue);
+                           hasNoDependencies, inChainValue, spendsCoinbase);
 }
 
 void Shutdown(void* parg)

src/test/test_bitcoin.h

@@ -65,10 +65,11 @@ struct TestMemPoolEntryHelper
     double dPriority;
     unsigned int nHeight;
     bool hadNoDependencies;
+    bool spendsCoinbase;
 
     TestMemPoolEntryHelper() :
         nFee(0), nTime(0), dPriority(0.0), nHeight(1),
-        hadNoDependencies(false) { }
+        hadNoDependencies(false), spendsCoinbase(false) { }
 
     CTxMemPoolEntry FromTx(CMutableTransaction &tx, CTxMemPool *pool = NULL);
 
@@ -78,5 +79,6 @@ struct TestMemPoolEntryHelper
     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; }
 };
 #endif

src/txmempool.cpp

@@ -21,9 +21,11 @@ using namespace std;
 
 CTxMemPoolEntry::CTxMemPoolEntry(const CTransaction& _tx, const CAmount& _nFee,
                                  int64_t _nTime, double _entryPriority, unsigned int _entryHeight,
-                                 bool poolHasNoInputsOf, CAmount _inChainInputValue):
+                                 bool poolHasNoInputsOf, CAmount _inChainInputValue,
+                                 bool _spendsCoinbase):
     tx(_tx), nFee(_nFee), nTime(_nTime), entryPriority(_entryPriority), entryHeight(_entryHeight),
-    hadNoDependencies(poolHasNoInputsOf), inChainInputValue(_inChainInputValue)
+    hadNoDependencies(poolHasNoInputsOf), inChainInputValue(_inChainInputValue),
+    spendsCoinbase(_spendsCoinbase)
 {
     nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
     nModSize = tx.CalculateModifiedSize(nTxSize);
@@ -488,7 +490,7 @@ void CTxMemPool::removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMem
         const CTransaction& tx = it->GetTx();
         if (!IsFinalTx(tx, nMemPoolHeight, GetAdjustedTime())) {
             transactionsToRemove.push_back(tx);
-        } else {
+        } else if (it->GetSpendsCoinbase()) {
             BOOST_FOREACH(const CTxIn& txin, tx.vin) {
                 indexed_transaction_set::const_iterator it2 = mapTx.find(txin.prevout.hash);
                 if (it2 != mapTx.end())

src/txmempool.h

@@ -67,6 +67,7 @@ private:
     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
 
     // Information about descendants of this transaction that are in the
     // mempool; if we remove this transaction we must remove all of these
@@ -80,7 +81,7 @@ private:
 public:
     CTxMemPoolEntry(const CTransaction& _tx, const CAmount& _nFee,
                     int64_t _nTime, double _entryPriority, unsigned int _entryHeight,
-                    bool poolHasNoInputsOf, CAmount _inChainInputValue);
+                    bool poolHasNoInputsOf, CAmount _inChainInputValue, bool spendsCoinbase);
     CTxMemPoolEntry(const CTxMemPoolEntry& other);
 
     const CTransaction& GetTx() const { return this->tx; }
@@ -109,6 +110,8 @@ public:
     uint64_t GetCountWithDescendants() const { return nCountWithDescendants; }
     uint64_t GetSizeWithDescendants() const { return nSizeWithDescendants; }
     CAmount GetFeesWithDescendants() const { return nFeesWithDescendants; }
+
+    bool GetSpendsCoinbase() const { return spendsCoinbase; }
 };
 
 // Helpers for modifying CTxMemPool::mapTx, which is a boost multi_index.