Optimisation: Store transaction list order in memory rather than compute it every need

Huge performance improvement (450%) for zapwallettxes

src/test/accounting_tests.cpp

@@ -45,7 +45,7 @@ BOOST_AUTO_TEST_CASE(acc_orderupgrade)
     ae.nTime = 1333333333;
     ae.strOtherAccount = "b";
     ae.strComment = "";
-    walletdb.WriteAccountingEntry(ae);
+    pwalletMain->AddAccountingEntry(ae, walletdb);
 
     wtx.mapValue["comment"] = "z";
     pwalletMain->AddToWallet(wtx, false, &walletdb);
@@ -55,7 +55,7 @@ BOOST_AUTO_TEST_CASE(acc_orderupgrade)
 
     ae.nTime = 1333333336;
     ae.strOtherAccount = "c";
-    walletdb.WriteAccountingEntry(ae);
+    pwalletMain->AddAccountingEntry(ae, walletdb);
 
     GetResults(walletdb, results);
 
@@ -71,7 +71,7 @@ BOOST_AUTO_TEST_CASE(acc_orderupgrade)
     ae.nTime = 1333333330;
     ae.strOtherAccount = "d";
     ae.nOrderPos = pwalletMain->IncOrderPosNext();
-    walletdb.WriteAccountingEntry(ae);
+    pwalletMain->AddAccountingEntry(ae, walletdb);
 
     GetResults(walletdb, results);
 
@@ -121,7 +121,7 @@ BOOST_AUTO_TEST_CASE(acc_orderupgrade)
     ae.nTime = 1333333334;
     ae.strOtherAccount = "e";
     ae.nOrderPos = -1;
-    walletdb.WriteAccountingEntry(ae);
+    pwalletMain->AddAccountingEntry(ae, walletdb);
 
     GetResults(walletdb, results);
 

src/wallet/rpcwallet.cpp

@@ -835,7 +835,7 @@ UniValue movecmd(const UniValue& params, bool fHelp)
     debit.nTime = nNow;
     debit.strOtherAccount = strTo;
     debit.strComment = strComment;
-    walletdb.WriteAccountingEntry(debit);
+    pwalletMain->AddAccountingEntry(debit, walletdb);
 
     // Credit
     CAccountingEntry credit;
@@ -845,7 +845,7 @@ UniValue movecmd(const UniValue& params, bool fHelp)
     credit.nTime = nNow;
     credit.strOtherAccount = strFrom;
     credit.strComment = strComment;
-    walletdb.WriteAccountingEntry(credit);
+    pwalletMain->AddAccountingEntry(credit, walletdb);
 
     if (!walletdb.TxnCommit())
         throw JSONRPCError(RPC_DATABASE_ERROR, "database error");
@@ -1470,11 +1470,10 @@ UniValue listtransactions(const UniValue& params, bool fHelp)
 
     UniValue ret(UniValue::VARR);
 
-    std::list<CAccountingEntry> acentries;
-    CWallet::TxItems txOrdered = pwalletMain->OrderedTxItems(acentries, strAccount);
+    const CWallet::TxItems & txOrdered = pwalletMain->wtxOrdered;
 
     // iterate backwards until we have nCount items to return:
-    for (CWallet::TxItems::reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
+    for (CWallet::TxItems::const_reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
     {
         CWalletTx *const pwtx = (*it).second.first;
         if (pwtx != 0)
@@ -1579,8 +1578,7 @@ UniValue listaccounts(const UniValue& params, bool fHelp)
         }
     }
 
-    list<CAccountingEntry> acentries;
-    CWalletDB(pwalletMain->strWalletFile).ListAccountCreditDebit("*", acentries);
+    const list<CAccountingEntry> & acentries = pwalletMain->laccentries;
     BOOST_FOREACH(const CAccountingEntry& entry, acentries)
         mapAccountBalances[entry.strAccount] += entry.nCreditDebit;
 

src/wallet/wallet.cpp

@@ -588,31 +588,6 @@ int64_t CWallet::IncOrderPosNext(CWalletDB *pwalletdb)
     return nRet;
 }
 
-CWallet::TxItems CWallet::OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount)
-{
-    AssertLockHeld(cs_wallet); // mapWallet
-    CWalletDB walletdb(strWalletFile);
-
-    // First: get all CWalletTx and CAccountingEntry into a sorted-by-order multimap.
-    TxItems txOrdered;
-
-    // Note: maintaining indices in the database of (account,time) --> txid and (account, time) --> acentry
-    // would make this much faster for applications that do this a lot.
-    for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
-    {
-        CWalletTx* wtx = &((*it).second);
-        txOrdered.insert(make_pair(wtx->nOrderPos, TxPair(wtx, (CAccountingEntry*)0)));
-    }
-    acentries.clear();
-    walletdb.ListAccountCreditDebit(strAccount, acentries);
-    BOOST_FOREACH(CAccountingEntry& entry, acentries)
-    {
-        txOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
-    }
-
-    return txOrdered;
-}
-
 void CWallet::MarkDirty()
 {
     {
@@ -629,7 +604,9 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletD
     if (fFromLoadWallet)
     {
         mapWallet[hash] = wtxIn;
-        mapWallet[hash].BindWallet(this);
+        CWalletTx& wtx = mapWallet[hash];
+        wtx.BindWallet(this);
+        wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
         AddToSpends(hash);
     }
     else
@@ -644,6 +621,7 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletD
         {
             wtx.nTimeReceived = GetAdjustedTime();
             wtx.nOrderPos = IncOrderPosNext(pwalletdb);
+            wtxOrdered.insert(make_pair(wtx.nOrderPos, TxPair(&wtx, (CAccountingEntry*)0)));
 
             wtx.nTimeSmart = wtx.nTimeReceived;
             if (!wtxIn.hashBlock.IsNull())
@@ -655,9 +633,8 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletD
                     {
                         // Tolerate times up to the last timestamp in the wallet not more than 5 minutes into the future
                         int64_t latestTolerated = latestNow + 300;
-                        std::list<CAccountingEntry> acentries;
-                        TxItems txOrdered = OrderedTxItems(acentries);
-                        for (TxItems::reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
+                        const TxItems & txOrdered = wtxOrdered;
+                        for (TxItems::const_reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
                         {
                             CWalletTx *const pwtx = (*it).second.first;
                             if (pwtx == &wtx)
@@ -2118,6 +2095,18 @@ bool CWallet::CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey)
     return true;
 }
 
+bool CWallet::AddAccountingEntry(const CAccountingEntry& acentry, CWalletDB & pwalletdb)
+{
+    if (!pwalletdb.WriteAccountingEntry_Backend(acentry))
+        return false;
+
+    laccentries.push_back(acentry);
+    CAccountingEntry & entry = laccentries.back();
+    wtxOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
+
+    return true;
+}
+
 CAmount CWallet::GetRequiredFee(unsigned int nTxBytes)
 {
     return std::max(minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));

src/wallet/wallet.h

@@ -531,6 +531,11 @@ public:
     }
 
     std::map<uint256, CWalletTx> mapWallet;
+    std::list<CAccountingEntry> laccentries;
+
+    typedef std::pair<CWalletTx*, CAccountingEntry*> TxPair;
+    typedef std::multimap<int64_t, TxPair > TxItems;
+    TxItems wtxOrdered;
 
     int64_t nOrderPosNext;
     std::map<uint256, int> mapRequestCount;
@@ -617,16 +622,6 @@ public:
      */
     int64_t IncOrderPosNext(CWalletDB *pwalletdb = NULL);
 
-    typedef std::pair<CWalletTx*, CAccountingEntry*> TxPair;
-    typedef std::multimap<int64_t, TxPair > TxItems;
-
-    /**
-     * Get the wallet's activity log
-     * @return multimap of ordered transactions and accounting entries
-     * @warning Returned pointers are *only* valid within the scope of passed acentries
-     */
-    TxItems OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount = "");
-
     void MarkDirty();
     bool AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletDB* pwalletdb);
     void SyncTransaction(const CTransaction& tx, const CBlock* pblock);
@@ -656,6 +651,8 @@ public:
                            std::string& strFailReason, const CCoinControl *coinControl = NULL, bool sign = true);
     bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey);
 
+    bool AddAccountingEntry(const CAccountingEntry&, CWalletDB & pwalletdb);
+
     static CFeeRate minTxFee;
     /**
      * Estimate the minimum fee considering user set parameters

src/wallet/walletdb.cpp

@@ -191,7 +191,7 @@ bool CWalletDB::WriteAccountingEntry(const uint64_t nAccEntryNum, const CAccount
     return Write(std::make_pair(std::string("acentry"), std::make_pair(acentry.strAccount, nAccEntryNum)), acentry);
 }
 
-bool CWalletDB::WriteAccountingEntry(const CAccountingEntry& acentry)
+bool CWalletDB::WriteAccountingEntry_Backend(const CAccountingEntry& acentry)
 {
     return WriteAccountingEntry(++nAccountingEntryNumber, acentry);
 }
@@ -709,6 +709,12 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
     if (wss.fAnyUnordered)
         result = ReorderTransactions(pwallet);
 
+    pwallet->laccentries.clear();
+    ListAccountCreditDebit("*", pwallet->laccentries);
+    BOOST_FOREACH(CAccountingEntry& entry, pwallet->laccentries) {
+        pwallet->wtxOrdered.insert(make_pair(entry.nOrderPos, CWallet::TxPair((CWalletTx*)0, &entry)));
+    }
+
     return result;
 }
 

src/wallet/walletdb.h

@@ -110,6 +110,9 @@ public:
 
     bool WriteMinVersion(int nVersion);
 
+    /// This writes directly to the database, and will not update the CWallet's cached accounting entries!
+    /// Use wallet.AddAccountingEntry instead, to write *and* update its caches.
+    bool WriteAccountingEntry_Backend(const CAccountingEntry& acentry);
     bool ReadAccount(const std::string& strAccount, CAccount& account);
     bool WriteAccount(const std::string& strAccount, const CAccount& account);
 
@@ -118,7 +121,6 @@ public:
     /// Erase destination data tuple from wallet database
     bool EraseDestData(const std::string &address, const std::string &key);
 
-    bool WriteAccountingEntry(const CAccountingEntry& acentry);
     CAmount GetAccountCreditDebit(const std::string& strAccount);
     void ListAccountCreditDebit(const std::string& strAccount, std::list<CAccountingEntry>& acentries);