From 0165a56f20bf0666c9a0850d5634bf5547cee29b Mon Sep 17 00:00:00 2001
From: Jonas Schnelli <dev@jonasschnelli.ch>
Date: Sat, 12 Nov 2016 10:53:18 +0100
Subject: [PATCH] Refactor ZapWalletTxes to avoid layer vialotions

---
 src/wallet/wallet.cpp   | 11 ++++++++---
 src/wallet/walletdb.cpp | 14 +++++---------
 src/wallet/walletdb.h   |  6 +++---
 3 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 358a5ecfc..50e5e2a68 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2846,12 +2846,16 @@ DBErrors CWallet::ZapSelectTx(vector<uint256>& vHashIn, vector<uint256>& vHashOu
 {
     if (!fFileBacked)
         return DB_LOAD_OK;
-    DBErrors nZapSelectTxRet = CWalletDB(strWalletFile,"cr+").ZapSelectTx(this, vHashIn, vHashOut);
+    AssertLockHeld(cs_wallet); // mapWallet
+    vchDefaultKey = CPubKey();
+    DBErrors nZapSelectTxRet = CWalletDB(strWalletFile,"cr+").ZapSelectTx(vHashIn, vHashOut);
+    for (uint256 hash : vHashOut)
+        mapWallet.erase(hash);
+
     if (nZapSelectTxRet == DB_NEED_REWRITE)
     {
         if (CDB::Rewrite(strWalletFile, "\x04pool"))
         {
-            LOCK(cs_wallet);
             setKeyPool.clear();
             // Note: can't top-up keypool here, because wallet is locked.
             // User will be prompted to unlock wallet the next operation
@@ -2872,7 +2876,8 @@ DBErrors CWallet::ZapWalletTx(std::vector<CWalletTx>& vWtx)
 {
     if (!fFileBacked)
         return DB_LOAD_OK;
-    DBErrors nZapWalletTxRet = CWalletDB(strWalletFile,"cr+").ZapWalletTx(this, vWtx);
+    vchDefaultKey = CPubKey();
+    DBErrors nZapWalletTxRet = CWalletDB(strWalletFile,"cr+").ZapWalletTx(vWtx);
     if (nZapWalletTxRet == DB_NEED_REWRITE)
     {
         if (CDB::Rewrite(strWalletFile, "\x04pool"))
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 9cd19ab61..e67b7f2c5 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -646,20 +646,17 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
     return result;
 }
 
-DBErrors CWalletDB::FindWalletTx(CWallet* pwallet, vector<uint256>& vTxHash, vector<CWalletTx>& vWtx)
+DBErrors CWalletDB::FindWalletTx(vector<uint256>& vTxHash, vector<CWalletTx>& vWtx)
 {
-    pwallet->vchDefaultKey = CPubKey();
     bool fNoncriticalErrors = false;
     DBErrors result = DB_LOAD_OK;
 
     try {
-        LOCK(pwallet->cs_wallet);
         int nMinVersion = 0;
         if (Read((string)"minversion", nMinVersion))
         {
             if (nMinVersion > CLIENT_VERSION)
                 return DB_TOO_NEW;
-            pwallet->LoadMinVersion(nMinVersion);
         }
 
         // Get cursor
@@ -712,12 +709,12 @@ DBErrors CWalletDB::FindWalletTx(CWallet* pwallet, vector<uint256>& vTxHash, vec
     return result;
 }
 
-DBErrors CWalletDB::ZapSelectTx(CWallet* pwallet, vector<uint256>& vTxHashIn, vector<uint256>& vTxHashOut)
+DBErrors CWalletDB::ZapSelectTx(vector<uint256>& vTxHashIn, vector<uint256>& vTxHashOut)
 {
     // build list of wallet TXs and hashes
     vector<uint256> vTxHash;
     vector<CWalletTx> vWtx;
-    DBErrors err = FindWalletTx(pwallet, vTxHash, vWtx);
+    DBErrors err = FindWalletTx(vTxHash, vWtx);
     if (err != DB_LOAD_OK) {
         return err;
     }
@@ -736,7 +733,6 @@ DBErrors CWalletDB::ZapSelectTx(CWallet* pwallet, vector<uint256>& vTxHashIn, ve
             break;
         }
         else if ((*it) == hash) {
-            pwallet->mapWallet.erase(hash);
             if(!EraseTx(hash)) {
                 LogPrint("db", "Transaction was found for deletion but returned database error: %s\n", hash.GetHex());
                 delerror = true;
@@ -751,11 +747,11 @@ DBErrors CWalletDB::ZapSelectTx(CWallet* pwallet, vector<uint256>& vTxHashIn, ve
     return DB_LOAD_OK;
 }
 
-DBErrors CWalletDB::ZapWalletTx(CWallet* pwallet, vector<CWalletTx>& vWtx)
+DBErrors CWalletDB::ZapWalletTx(vector<CWalletTx>& vWtx)
 {
     // build list of wallet TXs
     vector<uint256> vTxHash;
-    DBErrors err = FindWalletTx(pwallet, vTxHash, vWtx);
+    DBErrors err = FindWalletTx(vTxHash, vWtx);
     if (err != DB_LOAD_OK)
         return err;
 
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index b9db55baa..6040372d9 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -167,9 +167,9 @@ public:
     void ListAccountCreditDebit(const std::string& strAccount, std::list<CAccountingEntry>& acentries);
 
     DBErrors LoadWallet(CWallet* pwallet);
-    DBErrors FindWalletTx(CWallet* pwallet, std::vector<uint256>& vTxHash, std::vector<CWalletTx>& vWtx);
-    DBErrors ZapWalletTx(CWallet* pwallet, std::vector<CWalletTx>& vWtx);
-    DBErrors ZapSelectTx(CWallet* pwallet, std::vector<uint256>& vHashIn, std::vector<uint256>& vHashOut);
+    DBErrors FindWalletTx(std::vector<uint256>& vTxHash, std::vector<CWalletTx>& vWtx);
+    DBErrors ZapWalletTx(std::vector<CWalletTx>& vWtx);
+    DBErrors ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256>& vHashOut);
     static bool Recover(CDBEnv& dbenv, const std::string& filename, bool fOnlyKeys);
     static bool Recover(CDBEnv& dbenv, const std::string& filename);