Added a 'dry run' option to AcceptToMemoryPool

amiller · amiller · commit 7148d4bdfb01 · 2017-06-03T15:56:43.000-05:00
diff --git a/src/validation.cpp b/src/validation.cpp
@@ -394,7 +394,8 @@ void UpdateMempoolForReorg(DisconnectedBlockTransactions &disconnectpool, bool f
 
 bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const CTransactionRef& ptx, bool fLimitFree,
                               bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
-                              bool fOverrideMempoolLimit, const CAmount& nAbsurdFee, std::vector<COutPoint>& coins_to_uncache)
+                              bool fOverrideMempoolLimit, const CAmount& nAbsurdFee, std::vector<COutPoint>& coins_to_uncache,
+			      bool fDryRun)
 {
     const CTransaction& tx = *ptx;
     const uint256 hash = tx.GetHash();
@@ -774,6 +775,9 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
                 __func__, hash.ToString(), FormatStateMessage(state));
         }
 
+	// If this is a dry run, quit here before modifying any state
+	if (fDryRun) return true;
+
         // Remove conflicting transactions from the mempool
         BOOST_FOREACH(const CTxMemPool::txiter it, allConflicting)
         {
@@ -811,10 +815,11 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
 
 bool AcceptToMemoryPoolWithTime(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
                         bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
-                        bool fOverrideMempoolLimit, const CAmount nAbsurdFee)
+			bool fOverrideMempoolLimit, const CAmount nAbsurdFee,
+			bool fDryRun)
 {
     std::vector<COutPoint> coins_to_uncache;
-    bool res = AcceptToMemoryPoolWorker(pool, state, tx, fLimitFree, pfMissingInputs, nAcceptTime, plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee, coins_to_uncache);
+    bool res = AcceptToMemoryPoolWorker(pool, state, tx, fLimitFree, pfMissingInputs, nAcceptTime, plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee, coins_to_uncache, fDryRun);
     if (!res) {
         BOOST_FOREACH(const COutPoint& hashTx, coins_to_uncache)
             pcoinsTip->Uncache(hashTx);
@@ -827,9 +832,10 @@ bool AcceptToMemoryPoolWithTime(CTxMemPool& pool, CValidationState &state, const
 
 bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
                         bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced,
-                        bool fOverrideMempoolLimit, const CAmount nAbsurdFee)
+                        bool fOverrideMempoolLimit, const CAmount nAbsurdFee,
+			bool fDryRun)
 {
-    return AcceptToMemoryPoolWithTime(pool, state, tx, fLimitFree, pfMissingInputs, GetTime(), plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee);
+    return AcceptToMemoryPoolWithTime(pool, state, tx, fLimitFree, pfMissingInputs, GetTime(), plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee, fDryRun);
 }
 
 /** Return transaction in txOut, and if it was found inside a block, its hash is placed in hashBlock */
diff --git a/src/validation.h b/src/validation.h
@@ -328,12 +328,14 @@ void PruneBlockFilesManual(int nManualPruneHeight);
  * plTxnReplaced will be appended to with all transactions replaced from mempool **/
 bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
                         bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced = NULL,
-                        bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0);
+                        bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0,
+			bool fDryRun=false);
 
 /** (try to) add transaction to memory pool with a specified acceptance time **/
 bool AcceptToMemoryPoolWithTime(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
                         bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced = NULL,
-                        bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0);
+			bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0,
+			bool fDryRun=false);
 
 /** Convert CValidationState to a human-readable message for logging */
 std::string FormatStateMessage(const CValidationState &state);
