CreateTransaction: Don't return success with too-many-ancestor txn

src/wallet/wallet.cpp

@@ -2555,6 +2555,21 @@ 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(txNew, 0, 0, 0, 0, false, 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;
+        size_t nLimitDescendants = GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
+        size_t nLimitDescendantSize = GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000;
+        std::string errString;
+        if (!mempool.CalculateMemPoolAncestors(entry, setAncestors, nLimitAncestors, nLimitAncestorSize, nLimitDescendants, nLimitDescendantSize, errString)) {
+            strFailReason = _("Transaction has too long of a mempool chain");
+            return false;
+        }
+    }
     return true;
 }