Merge #9240: Remove txConflicted

a874ab5 remove internal tracking of mempool conflicts for reporting to wallet (Alex Morcos)
bf663f8 remove external usage of mempool conflict tracking (Alex Morcos)

5 files changed, 36 insertions, 45 deletions

diff --git a/src/test/blockencodings_tests.cpp b/src/test/blockencodings_tests.cpp
index b013cda6d7..7478758f73 100644
--- a/src/test/blockencodings_tests.cpp
+++ b/src/test/blockencodings_tests.cpp
@@ -80,9 +80,9 @@ BOOST_AUTO_TEST_CASE(SimpleRoundTripTest)
 
         BOOST_CHECK_EQUAL(pool.mapTx.find(block.vtx[2]->GetHash())->GetSharedTx().use_count(), SHARED_TX_OFFSET + 1);
 
-        std::vector<CTransactionRef> removed;
-        pool.removeRecursive(*block.vtx[2], &removed);
-        BOOST_CHECK_EQUAL(removed.size(), 1);
+        size_t poolSize = pool.size();
+        pool.removeRecursive(*block.vtx[2]);
+        BOOST_CHECK_EQUAL(pool.size(), poolSize - 1);
 
         CBlock block2;
         std::vector<CTransactionRef> vtx_missing;
diff --git a/src/test/mempool_tests.cpp b/src/test/mempool_tests.cpp
index 1faf8b6aeb..bdd6eaf538 100644
--- a/src/test/mempool_tests.cpp
+++ b/src/test/mempool_tests.cpp
@@ -55,17 +55,17 @@ BOOST_AUTO_TEST_CASE(MempoolRemoveTest)
 
 
     CTxMemPool testPool(CFeeRate(0));
-    std::vector<CTransactionRef> removed;
 
     // Nothing in pool, remove should do nothing:
-    testPool.removeRecursive(txParent, &removed);
-    BOOST_CHECK_EQUAL(removed.size(), 0);
+    unsigned int poolSize = testPool.size();
+    testPool.removeRecursive(txParent);
+    BOOST_CHECK_EQUAL(testPool.size(), poolSize);
 
     // Just the parent:
     testPool.addUnchecked(txParent.GetHash(), entry.FromTx(txParent));
-    testPool.removeRecursive(txParent, &removed);
-    BOOST_CHECK_EQUAL(removed.size(), 1);
-    removed.clear();
+    poolSize = testPool.size();
+    testPool.removeRecursive(txParent);
+    BOOST_CHECK_EQUAL(testPool.size(), poolSize - 1);
     
     // Parent, children, grandchildren:
     testPool.addUnchecked(txParent.GetHash(), entry.FromTx(txParent));
@@ -75,19 +75,21 @@ BOOST_AUTO_TEST_CASE(MempoolRemoveTest)
         testPool.addUnchecked(txGrandChild[i].GetHash(), entry.FromTx(txGrandChild[i]));
     }
     // Remove Child[0], GrandChild[0] should be removed:
-    testPool.removeRecursive(txChild[0], &removed);
-    BOOST_CHECK_EQUAL(removed.size(), 2);
-    removed.clear();
+    poolSize = testPool.size();
+    testPool.removeRecursive(txChild[0]);
+    BOOST_CHECK_EQUAL(testPool.size(), poolSize - 2);
     // ... make sure grandchild and child are gone:
-    testPool.removeRecursive(txGrandChild[0], &removed);
-    BOOST_CHECK_EQUAL(removed.size(), 0);
-    testPool.removeRecursive(txChild[0], &removed);
-    BOOST_CHECK_EQUAL(removed.size(), 0);
+    poolSize = testPool.size();
+    testPool.removeRecursive(txGrandChild[0]);
+    BOOST_CHECK_EQUAL(testPool.size(), poolSize);
+    poolSize = testPool.size();
+    testPool.removeRecursive(txChild[0]);
+    BOOST_CHECK_EQUAL(testPool.size(), poolSize);
     // Remove parent, all children/grandchildren should go:
-    testPool.removeRecursive(txParent, &removed);
-    BOOST_CHECK_EQUAL(removed.size(), 5);
+    poolSize = testPool.size();
+    testPool.removeRecursive(txParent);
+    BOOST_CHECK_EQUAL(testPool.size(), poolSize - 5);
     BOOST_CHECK_EQUAL(testPool.size(), 0);
-    removed.clear();
 
     // Add children and grandchildren, but NOT the parent (simulate the parent being in a block)
     for (int i = 0; i < 3; i++)
@@ -97,10 +99,10 @@ BOOST_AUTO_TEST_CASE(MempoolRemoveTest)
     }
     // Now remove the parent, as might happen if a block-re-org occurs but the parent cannot be
     // put into the mempool (maybe because it is non-standard):
-    testPool.removeRecursive(txParent, &removed);
-    BOOST_CHECK_EQUAL(removed.size(), 6);
+    poolSize = testPool.size();
+    testPool.removeRecursive(txParent);
+    BOOST_CHECK_EQUAL(testPool.size(), poolSize - 6);
     BOOST_CHECK_EQUAL(testPool.size(), 0);
-    removed.clear();
 }
 
 template<typename name>
@@ -412,7 +414,7 @@ BOOST_AUTO_TEST_CASE(MempoolAncestorIndexingTest)
     /* after tx6 is mined, tx7 should move up in the sort */
     std::vector<CTransactionRef> vtx;
     vtx.push_back(MakeTransactionRef(tx6));
-    pool.removeForBlock(vtx, 1, NULL, false);
+    pool.removeForBlock(vtx, 1);
 
     sortedOrder.erase(sortedOrder.begin()+1);
     sortedOrder.pop_back();
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index c035a84db5..4334ebde6d 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -503,7 +503,7 @@ void CTxMemPool::CalculateDescendants(txiter entryit, setEntries &setDescendants
     }
 }
 
-void CTxMemPool::removeRecursive(const CTransaction &origTx, std::vector<CTransactionRef>* removed)
+void CTxMemPool::removeRecursive(const CTransaction &origTx)
 {
     // Remove transaction from memory pool
     {
@@ -530,11 +530,6 @@ void CTxMemPool::removeRecursive(const CTransaction &origTx, std::vector<CTransa
         BOOST_FOREACH(txiter it, txToRemove) {
             CalculateDescendants(it, setAllRemoves);
         }
-        if (removed) {
-            BOOST_FOREACH(txiter it, setAllRemoves) {
-                removed->emplace_back(it->GetSharedTx());
-            }
-        }
         RemoveStaged(setAllRemoves, false);
     }
 }
@@ -576,7 +571,7 @@ void CTxMemPool::removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMem
     RemoveStaged(setAllRemoves, false);
 }
 
-void CTxMemPool::removeConflicts(const CTransaction &tx, std::vector<CTransactionRef>* removed)
+void CTxMemPool::removeConflicts(const CTransaction &tx)
 {
     // Remove transactions which depend on inputs of tx, recursively
     LOCK(cs);
@@ -586,7 +581,7 @@ void CTxMemPool::removeConflicts(const CTransaction &tx, std::vector<CTransactio
             const CTransaction &txConflict = *it->second;
             if (txConflict != tx)
             {
-                removeRecursive(txConflict, removed);
+                removeRecursive(txConflict);
                 ClearPrioritisation(txConflict.GetHash());
             }
         }
@@ -597,7 +592,7 @@ void CTxMemPool::removeConflicts(const CTransaction &tx, std::vector<CTransactio
  * Called when a block is connected. Removes from mempool and updates the miner fee estimator.
  */
 void CTxMemPool::removeForBlock(const std::vector<CTransactionRef>& vtx, unsigned int nBlockHeight,
-                                std::vector<CTransactionRef>* conflicts, bool fCurrentEstimate)
+                                bool fCurrentEstimate)
 {
     LOCK(cs);
     std::vector<CTxMemPoolEntry> entries;
@@ -617,7 +612,7 @@ void CTxMemPool::removeForBlock(const std::vector<CTransactionRef>& vtx, unsigne
             stage.insert(it);
             RemoveStaged(stage, true);
         }
-        removeConflicts(*tx, conflicts);
+        removeConflicts(*tx);
         ClearPrioritisation(tx->GetHash());
     }
     // After the txs in the new block have been removed from the mempool, update policy estimates
diff --git a/src/txmempool.h b/src/txmempool.h
index 23fe5a7abe..8a935391de 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -527,11 +527,11 @@ public:
     bool addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry, bool fCurrentEstimate = true);
     bool addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry, setEntries &setAncestors, bool fCurrentEstimate = true);
 
-    void removeRecursive(const CTransaction &tx, std::vector<CTransactionRef>* removed = NULL);
+    void removeRecursive(const CTransaction &tx);
     void removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMemPoolHeight, int flags);
-    void removeConflicts(const CTransaction &tx, std::vector<CTransactionRef>* removed = NULL);
+    void removeConflicts(const CTransaction &tx);
     void removeForBlock(const std::vector<CTransactionRef>& vtx, unsigned int nBlockHeight,
-                        std::vector<CTransactionRef>* conflicts = NULL, bool fCurrentEstimate = true);
+                        bool fCurrentEstimate = true);
     void clear();
     void _clear(); //lock free
     bool CompareDepthAndScore(const uint256& hasha, const uint256& hashb);
diff --git a/src/validation.cpp b/src/validation.cpp
index c1efa8bc17..7163b99a67 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2145,11 +2145,10 @@ static int64_t nTimeChainState = 0;
 static int64_t nTimePostConnect = 0;
 
 /**
- * Used to track conflicted transactions removed from mempool and transactions
- * applied to the UTXO state as a part of a single ActivateBestChainStep call.
+ * Used to track blocks whose transactions were applied to the UTXO state as a
+ * part of a single ActivateBestChainStep call.
  */
 struct ConnectTrace {
-    std::vector<CTransactionRef> txConflicted;
     std::vector<std::pair<CBlockIndex*, std::shared_ptr<const CBlock> > > blocksConnected;
 };
 
@@ -2200,7 +2199,7 @@ bool static ConnectTip(CValidationState& state, const CChainParams& chainparams,
     int64_t nTime5 = GetTimeMicros(); nTimeChainState += nTime5 - nTime4;
     LogPrint("bench", "  - Writing chainstate: %.2fms [%.2fs]\n", (nTime5 - nTime4) * 0.001, nTimeChainState * 0.000001);
     // Remove conflicting transactions from the mempool.;
-    mempool.removeForBlock(blockConnecting.vtx, pindexNew->nHeight, &connectTrace.txConflicted, !IsInitialBlockDownload());
+    mempool.removeForBlock(blockConnecting.vtx, pindexNew->nHeight, !IsInitialBlockDownload());
     // Update chainActive & related variables.
     UpdateTip(pindexNew, chainparams);
 
@@ -2425,11 +2424,6 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
 
         // throw all transactions though the signal-interface
         // while _not_ holding the cs_main lock
-        for (const auto& tx : connectTrace.txConflicted)
-        {
-            GetMainSignals().SyncTransaction(*tx, pindexNewTip, CMainSignals::SYNC_TRANSACTION_NOT_IN_BLOCK);
-        }
-        // ... and about transactions that got confirmed:
         for (const auto& pair : connectTrace.blocksConnected) {
             assert(pair.second);
             const CBlock& block = *(pair.second);