From b3b3c2a5623d5c942d2b3565cc2d833c65105555 Mon Sep 17 00:00:00 2001
From: Jonas Schnelli <dev@jonasschnelli.ch>
Date: Tue, 26 Apr 2016 13:55:13 +0200
Subject: Reduce cs_main locks during ConnectTip/SyncWithWallets

---
 src/wallet/wallet.cpp | 43 ++++++++++++++++---------------------------
 1 file changed, 16 insertions(+), 27 deletions(-)

(limited to 'src/wallet/wallet.cpp')

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index ee9254050c..888aa029a3 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -886,18 +886,18 @@ bool CWallet::LoadToWallet(const CWalletTx& wtxIn)
  * pblock is optional, but should be provided if the transaction is known to be in a block.
  * If fUpdate is true, existing transactions will be updated.
  */
-bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate)
+bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlockIndex* pIndex, int posInBlock, bool fUpdate)
 {
     {
         AssertLockHeld(cs_wallet);
 
-        if (pblock) {
+        if (posInBlock != -1) {
             BOOST_FOREACH(const CTxIn& txin, tx.vin) {
                 std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range = mapTxSpends.equal_range(txin.prevout);
                 while (range.first != range.second) {
                     if (range.first->second != tx.GetHash()) {
-                        LogPrintf("Transaction %s (in block %s) conflicts with wallet transaction %s (both spend %s:%i)\n", tx.GetHash().ToString(), pblock->GetHash().ToString(), range.first->second.ToString(), range.first->first.hash.ToString(), range.first->first.n);
-                        MarkConflicted(pblock->GetHash(), range.first->second);
+                        LogPrintf("Transaction %s (in block %s) conflicts with wallet transaction %s (both spend %s:%i)\n", tx.GetHash().ToString(), pIndex->GetBlockHash().ToString(), range.first->second.ToString(), range.first->first.hash.ToString(), range.first->first.n);
+                        MarkConflicted(pIndex->GetBlockHash(), range.first->second);
                     }
                     range.first++;
                 }
@@ -911,8 +911,8 @@ bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pbl
             CWalletTx wtx(this,tx);
 
             // Get merkle branch if transaction was found in a block
-            if (pblock)
-                wtx.SetMerkleBranch(*pblock);
+            if (posInBlock != -1)
+                wtx.SetMerkleBranch(pIndex, posInBlock);
 
             return AddToWallet(wtx, false);
         }
@@ -1037,11 +1037,11 @@ void CWallet::MarkConflicted(const uint256& hashBlock, const uint256& hashTx)
     }
 }
 
-void CWallet::SyncTransaction(const CTransaction& tx, const CBlockIndex *pindex, const CBlock* pblock)
+void CWallet::SyncTransaction(const CTransaction& tx, const CBlockIndex *pindex, int posInBlock)
 {
     LOCK2(cs_main, cs_wallet);
 
-    if (!AddToWalletIfInvolvingMe(tx, pblock, true))
+    if (!AddToWalletIfInvolvingMe(tx, pindex, posInBlock, true))
         return; // Not one of ours
 
     // If a transaction changes 'conflicted' state, that changes the balance
@@ -1399,9 +1399,10 @@ int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
 
             CBlock block;
             ReadBlockFromDisk(block, pindex, Params().GetConsensus());
-            BOOST_FOREACH(CTransaction& tx, block.vtx)
+            int posInBlock;
+            for (posInBlock = 0; posInBlock < (int)block.vtx.size(); posInBlock++)
             {
-                if (AddToWalletIfInvolvingMe(tx, &block, fUpdate))
+                if (AddToWalletIfInvolvingMe(block.vtx[posInBlock], pindex, posInBlock, fUpdate))
                     ret++;
             }
             pindex = chainActive.Next(pindex);
@@ -3526,31 +3527,19 @@ CWalletKey::CWalletKey(int64_t nExpires)
     nTimeExpires = nExpires;
 }
 
-int CMerkleTx::SetMerkleBranch(const CBlock& block)
+int CMerkleTx::SetMerkleBranch(const CBlockIndex* pindex, int posInBlock)
 {
     AssertLockHeld(cs_main);
     CBlock blockTmp;
 
     // Update the tx's hashBlock
-    hashBlock = block.GetHash();
+    hashBlock = pindex->GetBlockHash();
 
-    // Locate the transaction
-    for (nIndex = 0; nIndex < (int)block.vtx.size(); nIndex++)
-        if (block.vtx[nIndex] == *(CTransaction*)this)
-            break;
-    if (nIndex == (int)block.vtx.size())
-    {
-        nIndex = -1;
-        LogPrintf("ERROR: SetMerkleBranch(): couldn't find tx in block\n");
-        return 0;
-    }
+    // set the position of the transaction in the block
+    nIndex = posInBlock;
 
     // Is the tx in a block that's in the main chain
-    BlockMap::iterator mi = mapBlockIndex.find(hashBlock);
-    if (mi == mapBlockIndex.end())
-        return 0;
-    const CBlockIndex* pindex = (*mi).second;
-    if (!pindex || !chainActive.Contains(pindex))
+    if (!chainActive.Contains(pindex))
         return 0;
 
     return chainActive.Height() - pindex->nHeight + 1;
-- 
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