Merge #11309: Minor cleanups for AcceptToMemoryPool

bf64c3cb3 Ignore transactions added to mempool during a reorg for fee estimation purposes. (Alex Morcos)
04f78ab5b Do not reject based on mempool min fee when bypass_limits is set. (Alex Morcos)
fd849e1b0 Change AcceptToMemoryPool function signature (Alex Morcos)

Pull request description:

  First commit just removes default arguments from `AcceptToMemoryPool` and consolidates two arguments, it does not change behavior.

  Second commit finally fixes the fact that we're not meant to reject based on mempool min fee when adding a transaction from a disconnected block during a reorg as mentioned [here](https://github.com/bitcoin/bitcoin/pull/9602#issue-202197849)

  Third commit makes fee estimation ignore transactions added from a disconnected block during a reorg. I think this was another source of fee estimates returning estimates below 1000 sat/kB as in #11303.

Tree-SHA512: 30925ca8b341915bb214f1d2590b36b7931f2e125b7660150e38ae70338f00db5aa7f1608546dddb181446924177eb7cf62ea8bd2583068acc074d6c3f86bc0c

6 files changed, 34 insertions, 27 deletions

diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index b8900d9888..7fced41d4f 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1788,7 +1788,8 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
 
         std::list<CTransactionRef> lRemovedTxn;
 
-        if (!AlreadyHave(inv) && AcceptToMemoryPool(mempool, state, ptx, true, &fMissingInputs, &lRemovedTxn)) {
+        if (!AlreadyHave(inv) &&
+            AcceptToMemoryPool(mempool, state, ptx, &fMissingInputs, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
             mempool.check(pcoinsTip);
             RelayTransaction(tx, connman);
             for (unsigned int i = 0; i < tx.vout.size(); i++) {
@@ -1826,7 +1827,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
 
                     if (setMisbehaving.count(fromPeer))
                         continue;
-                    if (AcceptToMemoryPool(mempool, stateDummy, porphanTx, true, &fMissingInputs2, &lRemovedTxn)) {
+                    if (AcceptToMemoryPool(mempool, stateDummy, porphanTx, &fMissingInputs2, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
                         LogPrint(BCLog::MEMPOOL, "   accepted orphan tx %s\n", orphanHash.ToString());
                         RelayTransaction(orphanTx, connman);
                         for (unsigned int i = 0; i < orphanTx.vout.size(); i++) {
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index b2fc6a357a..d860dbc244 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -942,8 +942,8 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
         // push to local node and sync with wallets
         CValidationState state;
         bool fMissingInputs;
-        bool fLimitFree = true;
-        if (!AcceptToMemoryPool(mempool, state, std::move(tx), fLimitFree, &fMissingInputs, nullptr, false, nMaxRawTxFee)) {
+        if (!AcceptToMemoryPool(mempool, state, std::move(tx), &fMissingInputs,
+                                nullptr /* plTxnReplaced */, false /* bypass_limits */, nMaxRawTxFee)) {
             if (state.IsInvalid()) {
                 throw JSONRPCError(RPC_TRANSACTION_REJECTED, strprintf("%i: %s", state.GetRejectCode(), state.GetRejectReason()));
             } else {
diff --git a/src/test/txvalidationcache_tests.cpp b/src/test/txvalidationcache_tests.cpp
index 2d25cb96c8..82ca93e7da 100644
--- a/src/test/txvalidationcache_tests.cpp
+++ b/src/test/txvalidationcache_tests.cpp
@@ -29,7 +29,8 @@ ToMemPool(CMutableTransaction& tx)
     LOCK(cs_main);
 
     CValidationState state;
-    return AcceptToMemoryPool(mempool, state, MakeTransactionRef(tx), false, nullptr, nullptr, true, 0);
+    return AcceptToMemoryPool(mempool, state, MakeTransactionRef(tx), nullptr /* pfMissingInputs */,
+                              nullptr /* plTxnReplaced */, true /* bypass_limits */, 0 /* nAbsurdFee */);
 }
 
 BOOST_FIXTURE_TEST_CASE(tx_mempool_block_doublespend, TestChain100Setup)
diff --git a/src/validation.cpp b/src/validation.cpp
index bd9640e749..a958afe84f 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -384,7 +384,9 @@ void UpdateMempoolForReorg(DisconnectedBlockTransactions &disconnectpool, bool f
     while (it != disconnectpool.queuedTx.get<insertion_order>().rend()) {
         // ignore validation errors in resurrected transactions
         CValidationState stateDummy;
-        if (!fAddToMempool || (*it)->IsCoinBase() || !AcceptToMemoryPool(mempool, stateDummy, *it, false, nullptr, nullptr, true)) {
+        if (!fAddToMempool || (*it)->IsCoinBase() ||
+            !AcceptToMemoryPool(mempool, stateDummy, *it, nullptr /* pfMissingInputs */,
+                                nullptr /* plTxnReplaced */, true /* bypass_limits */, 0 /* nAbsurdFee */)) {
             // If the transaction doesn't make it in to the mempool, remove any
             // transactions that depend on it (which would now be orphans).
             mempool.removeRecursive(**it, MemPoolRemovalReason::REORG);
@@ -443,9 +445,9 @@ static bool CheckInputsFromMempoolAndCache(const CTransaction& tx, CValidationSt
     return CheckInputs(tx, state, view, true, flags, cacheSigStore, true, txdata);
 }
 
-static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool& pool, CValidationState& state, const CTransactionRef& ptx, bool fLimitFree,
+static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool& pool, CValidationState& state, const CTransactionRef& ptx,
                               bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
-                              bool fOverrideMempoolLimit, const CAmount& nAbsurdFee, std::vector<COutPoint>& coins_to_uncache)
+                              bool bypass_limits, const CAmount& nAbsurdFee, std::vector<COutPoint>& coins_to_uncache)
 {
     const CTransaction& tx = *ptx;
     const uint256 hash = tx.GetHash();
@@ -618,12 +620,12 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
                 strprintf("%d", nSigOpsCost));
 
         CAmount mempoolRejectFee = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nSize);
-        if (mempoolRejectFee > 0 && nModifiedFees < mempoolRejectFee) {
+        if (!bypass_limits && mempoolRejectFee > 0 && nModifiedFees < mempoolRejectFee) {
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met", false, strprintf("%d < %d", nFees, mempoolRejectFee));
         }
 
         // No transactions are allowed below minRelayTxFee except from disconnected blocks
-        if (fLimitFree && nModifiedFees < ::minRelayTxFee.GetFee(nSize)) {
+        if (!bypass_limits && nModifiedFees < ::minRelayTxFee.GetFee(nSize)) {
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "min relay fee not met");
         }
 
@@ -855,17 +857,18 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         }
         pool.RemoveStaged(allConflicting, false, MemPoolRemovalReason::REPLACED);
 
-        // This transaction should only count for fee estimation if it isn't a
-        // BIP 125 replacement transaction (may not be widely supported), the
-        // node is not behind, and the transaction is not dependent on any other
-        // transactions in the mempool.
-        bool validForFeeEstimation = !fReplacementTransaction && IsCurrentForFeeEstimation() && pool.HasNoInputsOf(tx);
+        // This transaction should only count for fee estimation if:
+        // - it isn't a BIP 125 replacement transaction (may not be widely supported)
+        // - it's not being readded during a reorg which bypasses typical mempool fee limits
+        // - the node is not behind
+        // - the transaction is not dependent on any other transactions in the mempool
+        bool validForFeeEstimation = !fReplacementTransaction && !bypass_limits && IsCurrentForFeeEstimation() && pool.HasNoInputsOf(tx);
 
         // Store transaction in memory
         pool.addUnchecked(hash, entry, setAncestors, validForFeeEstimation);
 
         // trim mempool and check if tx was trimmed
-        if (!fOverrideMempoolLimit) {
+        if (!bypass_limits) {
             LimitMempoolSize(pool, gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
             if (!pool.exists(hash))
                 return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "mempool full");
@@ -878,12 +881,12 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
 }
 
 /** (try to) add transaction to memory pool with a specified acceptance time **/
-static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
+static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx,
                         bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
-                        bool fOverrideMempoolLimit, const CAmount nAbsurdFee)
+                        bool bypass_limits, const CAmount nAbsurdFee)
 {
     std::vector<COutPoint> coins_to_uncache;
-    bool res = AcceptToMemoryPoolWorker(chainparams, pool, state, tx, fLimitFree, pfMissingInputs, nAcceptTime, plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee, coins_to_uncache);
+    bool res = AcceptToMemoryPoolWorker(chainparams, pool, state, tx, pfMissingInputs, nAcceptTime, plTxnReplaced, bypass_limits, nAbsurdFee, coins_to_uncache);
     if (!res) {
         for (const COutPoint& hashTx : coins_to_uncache)
             pcoinsTip->Uncache(hashTx);
@@ -894,12 +897,12 @@ static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPo
     return res;
 }
 
-bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx, bool fLimitFree,
+bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx,
                         bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced,
-                        bool fOverrideMempoolLimit, const CAmount nAbsurdFee)
+                        bool bypass_limits, const CAmount nAbsurdFee)
 {
     const CChainParams& chainparams = Params();
-    return AcceptToMemoryPoolWithTime(chainparams, pool, state, tx, fLimitFree, pfMissingInputs, GetTime(), plTxnReplaced, fOverrideMempoolLimit, nAbsurdFee);
+    return AcceptToMemoryPoolWithTime(chainparams, pool, state, tx, pfMissingInputs, GetTime(), plTxnReplaced, bypass_limits, nAbsurdFee);
 }
 
 /** Return transaction in txOut, and if it was found inside a block, its hash is placed in hashBlock */
@@ -4306,7 +4309,8 @@ bool LoadMempool(void)
             CValidationState state;
             if (nTime + nExpiryTimeout > nNow) {
                 LOCK(cs_main);
-                AcceptToMemoryPoolWithTime(chainparams, mempool, state, tx, true, nullptr, nTime, nullptr, false, 0);
+                AcceptToMemoryPoolWithTime(chainparams, mempool, state, tx, nullptr /* pfMissingInputs */, nTime,
+                                           nullptr /* plTxnReplaced */, false /* bypass_limits */, 0 /* nAbsurdFee */);
                 if (state.IsValid()) {
                     ++count;
                 } else {
diff --git a/src/validation.h b/src/validation.h
index bba621b84f..c7ef556b47 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -301,9 +301,9 @@ void PruneBlockFilesManual(int nManualPruneHeight);
 
 /** (try to) add transaction to memory pool
  * 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 = nullptr,
-                        bool fOverrideMempoolLimit=false, const CAmount nAbsurdFee=0);
+bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx,
+                        bool* pfMissingInputs, std::list<CTransactionRef>* plTxnReplaced,
+                        bool bypass_limits, const CAmount nAbsurdFee);
 
 /** Convert CValidationState to a human-readable message for logging */
 std::string FormatStateMessage(const CValidationState &state);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 6760d6ff84..b774305a34 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -4047,5 +4047,6 @@ int CMerkleTx::GetBlocksToMaturity() const
 
 bool CMerkleTx::AcceptToMemoryPool(const CAmount& nAbsurdFee, CValidationState& state)
 {
-    return ::AcceptToMemoryPool(mempool, state, tx, true, nullptr, nullptr, false, nAbsurdFee);
+    return ::AcceptToMemoryPool(mempool, state, tx, nullptr /* pfMissingInputs */,
+                                nullptr /* plTxnReplaced */, false /* bypass_limits */, nAbsurdFee);
 }