add CWalletTx::GetImmatureCredit() and use it in CWallet::GetImmatureBalance()

src/wallet.cpp

@@ -926,9 +926,8 @@ int64 CWallet::GetImmatureBalance() const
         LOCK(cs_wallet);
         for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
         {
-            const CWalletTx& pcoin = (*it).second;
-            if (pcoin.IsCoinBase() && pcoin.GetBlocksToMaturity() > 0 && pcoin.IsInMainChain())
-                nTotal += GetCredit(pcoin);
+            const CWalletTx* pcoin = &(*it).second;
+            nTotal += pcoin->GetImmatureCredit();
         }
     }
     return nTotal;

src/wallet.h

@@ -375,10 +375,12 @@ public:
     // memory only
     mutable bool fDebitCached;
     mutable bool fCreditCached;
+    mutable bool fImmatureCreditCached;
     mutable bool fAvailableCreditCached;
     mutable bool fChangeCached;
     mutable int64 nDebitCached;
     mutable int64 nCreditCached;
+    mutable int64 nImmatureCreditCached;
     mutable int64 nAvailableCreditCached;
     mutable int64 nChangeCached;
 
@@ -416,10 +418,12 @@ public:
         vfSpent.clear();
         fDebitCached = false;
         fCreditCached = false;
+        fImmatureCreditCached = false;
         fAvailableCreditCached = false;
         fChangeCached = false;
         nDebitCached = 0;
         nCreditCached = 0;
+        nImmatureCreditCached = 0;
         nAvailableCreditCached = 0;
         nChangeCached = 0;
         nOrderPos = -1;
@@ -563,6 +567,20 @@ public:
         return nCreditCached;
     }
 
+    int64 GetImmatureCredit(bool fUseCache=true) const
+    {
+        if (IsCoinBase() && GetBlocksToMaturity() > 0 && IsInMainChain())
+        {
+            if (fUseCache && fImmatureCreditCached)
+                return nImmatureCreditCached;
+            nImmatureCreditCached = pwallet->GetCredit(*this);
+            fImmatureCreditCached = true;
+            return nImmatureCreditCached;
+        }
+
+        return 0;
+    }
+
     int64 GetAvailableCredit(bool fUseCache=true) const
     {
         // Must wait until coinbase is safely deep enough in the chain before valuing it