propset svn:eol-style native

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@146 1a98c847-1fd6-4fd8-948a-caf3550aa51b

1 files changed, 805 insertions, 805 deletions

diff --git a/db.cpp b/db.cpp
index e436db63fe..6717c04baa 100644
--- a/db.cpp
+++ b/db.cpp
@@ -1,805 +1,805 @@
-// Copyright (c) 2009-2010 Satoshi Nakamoto

-// Distributed under the MIT/X11 software license, see the accompanying

-// file license.txt or http://www.opensource.org/licenses/mit-license.php.

-

-#include "headers.h"

-

-void ThreadFlushWalletDB(void* parg);

-

-

-unsigned int nWalletDBUpdated;

-

-

-

-

-//

-// CDB

-//

-

-static CCriticalSection cs_db;

-static bool fDbEnvInit = false;

-DbEnv dbenv(0);

-static map<string, int> mapFileUseCount;

-static map<string, Db*> mapDb;

-

-class CDBInit

-{

-public:

-    CDBInit()

-    {

-    }

-    ~CDBInit()

-    {

-        if (fDbEnvInit)

-        {

-            dbenv.close(0);

-            fDbEnvInit = false;

-        }

-    }

-}

-instance_of_cdbinit;

-

-

-CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)

-{

-    int ret;

-    if (pszFile == NULL)

-        return;

-

-    fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));

-    bool fCreate = strchr(pszMode, 'c');

-    unsigned int nFlags = DB_THREAD;

-    if (fCreate)

-        nFlags |= DB_CREATE;

-

-    CRITICAL_BLOCK(cs_db)

-    {

-        if (!fDbEnvInit)

-        {

-            if (fShutdown)

-                return;

-            string strDataDir = GetDataDir();

-            string strLogDir = strDataDir + "/database";

-            filesystem::create_directory(strLogDir.c_str());

-            string strErrorFile = strDataDir + "/db.log";

-            printf("dbenv.open strLogDir=%s strErrorFile=%s\n", strLogDir.c_str(), strErrorFile.c_str());

-

-            dbenv.set_lg_dir(strLogDir.c_str());

-            dbenv.set_lg_max(10000000);

-            dbenv.set_lk_max_locks(10000);

-            dbenv.set_lk_max_objects(10000);

-            dbenv.set_errfile(fopen(strErrorFile.c_str(), "a")); /// debug

-            dbenv.set_flags(DB_AUTO_COMMIT, 1);

-            ret = dbenv.open(strDataDir.c_str(),

-                             DB_CREATE     |

-                             DB_INIT_LOCK  |

-                             DB_INIT_LOG   |

-                             DB_INIT_MPOOL |

-                             DB_INIT_TXN   |

-                             DB_THREAD     |

-                             DB_PRIVATE    |

-                             DB_RECOVER,

-                             S_IRUSR | S_IWUSR);

-            if (ret > 0)

-                throw runtime_error(strprintf("CDB() : error %d opening database environment\n", ret));

-            fDbEnvInit = true;

-        }

-

-        strFile = pszFile;

-        ++mapFileUseCount[strFile];

-        pdb = mapDb[strFile];

-        if (pdb == NULL)

-        {

-            pdb = new Db(&dbenv, 0);

-

-            ret = pdb->open(NULL,      // Txn pointer

-                            pszFile,   // Filename

-                            "main",    // Logical db name

-                            DB_BTREE,  // Database type

-                            nFlags,    // Flags

-                            0);

-

-            if (ret > 0)

-            {

-                delete pdb;

-                pdb = NULL;

-                CRITICAL_BLOCK(cs_db)

-                    --mapFileUseCount[strFile];

-                strFile = "";

-                throw runtime_error(strprintf("CDB() : can't open database file %s, error %d\n", pszFile, ret));

-            }

-

-            if (fCreate && !Exists(string("version")))

-            {

-                bool fTmp = fReadOnly;

-                fReadOnly = false;

-                WriteVersion(VERSION);

-                fReadOnly = fTmp;

-            }

-

-            mapDb[strFile] = pdb;

-        }

-    }

-}

-

-void CDB::Close()

-{

-    if (!pdb)

-        return;

-    if (!vTxn.empty())

-        vTxn.front()->abort();

-    vTxn.clear();

-    pdb = NULL;

-

-    // Flush database activity from memory pool to disk log

-    unsigned int nMinutes = 0;

-    if (strFile == "addr.dat")

-        nMinutes = 2;

-    if (strFile == "blkindex.dat" && IsInitialBlockDownload() && nBestHeight % 500 != 0)

-        nMinutes = 1;

-    dbenv.txn_checkpoint(0, nMinutes, 0);

-

-    CRITICAL_BLOCK(cs_db)

-        --mapFileUseCount[strFile];

-}

-

-void CloseDb(const string& strFile)

-{

-    CRITICAL_BLOCK(cs_db)

-    {

-        if (mapDb[strFile] != NULL)

-        {

-            // Close the database handle

-            Db* pdb = mapDb[strFile];

-            pdb->close(0);

-            delete pdb;

-            mapDb[strFile] = NULL;

-        }

-    }

-}

-

-void DBFlush(bool fShutdown)

-{

-    // Flush log data to the actual data file

-    //  on all files that are not in use

-    printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");

-    if (!fDbEnvInit)

-        return;

-    CRITICAL_BLOCK(cs_db)

-    {

-        map<string, int>::iterator mi = mapFileUseCount.begin();

-        while (mi != mapFileUseCount.end())

-        {

-            string strFile = (*mi).first;

-            int nRefCount = (*mi).second;

-            printf("%s refcount=%d\n", strFile.c_str(), nRefCount);

-            if (nRefCount == 0)

-            {

-                // Move log data to the dat file

-                CloseDb(strFile);

-                dbenv.txn_checkpoint(0, 0, 0);

-                printf("%s flush\n", strFile.c_str());

-                dbenv.lsn_reset(strFile.c_str(), 0);

-                mapFileUseCount.erase(mi++);

-            }

-            else

-                mi++;

-        }

-        if (fShutdown)

-        {

-            char** listp;

-            if (mapFileUseCount.empty())

-                dbenv.log_archive(&listp, DB_ARCH_REMOVE);

-            dbenv.close(0);

-            fDbEnvInit = false;

-        }

-    }

-}

-

-

-

-

-

-

-//

-// CTxDB

-//

-

-bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)

-{

-    assert(!fClient);

-    txindex.SetNull();

-    return Read(make_pair(string("tx"), hash), txindex);

-}

-

-bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)

-{

-    assert(!fClient);

-    return Write(make_pair(string("tx"), hash), txindex);

-}

-

-bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)

-{

-    assert(!fClient);

-

-    // Add to tx index

-    uint256 hash = tx.GetHash();

-    CTxIndex txindex(pos, tx.vout.size());

-    return Write(make_pair(string("tx"), hash), txindex);

-}

-

-bool CTxDB::EraseTxIndex(const CTransaction& tx)

-{

-    assert(!fClient);

-    uint256 hash = tx.GetHash();

-

-    return Erase(make_pair(string("tx"), hash));

-}

-

-bool CTxDB::ContainsTx(uint256 hash)

-{

-    assert(!fClient);

-    return Exists(make_pair(string("tx"), hash));

-}

-

-bool CTxDB::ReadOwnerTxes(uint160 hash160, int nMinHeight, vector<CTransaction>& vtx)

-{

-    assert(!fClient);

-    vtx.clear();

-

-    // Get cursor

-    Dbc* pcursor = GetCursor();

-    if (!pcursor)

-        return false;

-

-    unsigned int fFlags = DB_SET_RANGE;

-    loop

-    {

-        // Read next record

-        CDataStream ssKey;

-        if (fFlags == DB_SET_RANGE)

-            ssKey << string("owner") << hash160 << CDiskTxPos(0, 0, 0);

-        CDataStream ssValue;

-        int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);

-        fFlags = DB_NEXT;

-        if (ret == DB_NOTFOUND)

-            break;

-        else if (ret != 0)

-        {

-            pcursor->close();

-            return false;

-        }

-

-        // Unserialize

-        string strType;

-        uint160 hashItem;

-        CDiskTxPos pos;

-        ssKey >> strType >> hashItem >> pos;

-        int nItemHeight;

-        ssValue >> nItemHeight;

-

-        // Read transaction

-        if (strType != "owner" || hashItem != hash160)

-            break;

-        if (nItemHeight >= nMinHeight)

-        {

-            vtx.resize(vtx.size()+1);

-            if (!vtx.back().ReadFromDisk(pos))

-            {

-                pcursor->close();

-                return false;

-            }

-        }

-    }

-

-    pcursor->close();

-    return true;

-}

-

-bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)

-{

-    assert(!fClient);

-    tx.SetNull();

-    if (!ReadTxIndex(hash, txindex))

-        return false;

-    return (tx.ReadFromDisk(txindex.pos));

-}

-

-bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)

-{

-    CTxIndex txindex;

-    return ReadDiskTx(hash, tx, txindex);

-}

-

-bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)

-{

-    return ReadDiskTx(outpoint.hash, tx, txindex);

-}

-

-bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)

-{

-    CTxIndex txindex;

-    return ReadDiskTx(outpoint.hash, tx, txindex);

-}

-

-bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)

-{

-    return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);

-}

-

-bool CTxDB::EraseBlockIndex(uint256 hash)

-{

-    return Erase(make_pair(string("blockindex"), hash));

-}

-

-bool CTxDB::ReadHashBestChain(uint256& hashBestChain)

-{

-    return Read(string("hashBestChain"), hashBestChain);

-}

-

-bool CTxDB::WriteHashBestChain(uint256 hashBestChain)

-{

-    return Write(string("hashBestChain"), hashBestChain);

-}

-

-bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)

-{

-    return Read(string("bnBestInvalidWork"), bnBestInvalidWork);

-}

-

-bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)

-{

-    return Write(string("bnBestInvalidWork"), bnBestInvalidWork);

-}

-

-CBlockIndex* InsertBlockIndex(uint256 hash)

-{

-    if (hash == 0)

-        return NULL;

-

-    // Return existing

-    map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);

-    if (mi != mapBlockIndex.end())

-        return (*mi).second;

-

-    // Create new

-    CBlockIndex* pindexNew = new CBlockIndex();

-    if (!pindexNew)

-        throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");

-    mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;

-    pindexNew->phashBlock = &((*mi).first);

-

-    return pindexNew;

-}

-

-bool CTxDB::LoadBlockIndex()

-{

-    // Get database cursor

-    Dbc* pcursor = GetCursor();

-    if (!pcursor)

-        return false;

-

-    // Load mapBlockIndex

-    unsigned int fFlags = DB_SET_RANGE;

-    loop

-    {

-        // Read next record

-        CDataStream ssKey;

-        if (fFlags == DB_SET_RANGE)

-            ssKey << make_pair(string("blockindex"), uint256(0));

-        CDataStream ssValue;

-        int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);

-        fFlags = DB_NEXT;

-        if (ret == DB_NOTFOUND)

-            break;

-        else if (ret != 0)

-            return false;

-

-        // Unserialize

-        string strType;

-        ssKey >> strType;

-        if (strType == "blockindex")

-        {

-            CDiskBlockIndex diskindex;

-            ssValue >> diskindex;

-

-            // Construct block index object

-            CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());

-            pindexNew->pprev          = InsertBlockIndex(diskindex.hashPrev);

-            pindexNew->pnext          = InsertBlockIndex(diskindex.hashNext);

-            pindexNew->nFile          = diskindex.nFile;

-            pindexNew->nBlockPos      = diskindex.nBlockPos;

-            pindexNew->nHeight        = diskindex.nHeight;

-            pindexNew->nVersion       = diskindex.nVersion;

-            pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;

-            pindexNew->nTime          = diskindex.nTime;

-            pindexNew->nBits          = diskindex.nBits;

-            pindexNew->nNonce         = diskindex.nNonce;

-

-            // Watch for genesis block

-            if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)

-                pindexGenesisBlock = pindexNew;

-

-            if (!pindexNew->CheckIndex())

-                return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);

-        }

-        else

-        {

-            break;

-        }

-    }

-    pcursor->close();

-

-    // Calculate bnChainWork

-    vector<pair<int, CBlockIndex*> > vSortedByHeight;

-    vSortedByHeight.reserve(mapBlockIndex.size());

-    foreach(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)

-    {

-        CBlockIndex* pindex = item.second;

-        vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));

-    }

-    sort(vSortedByHeight.begin(), vSortedByHeight.end());

-    foreach(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)

-    {

-        CBlockIndex* pindex = item.second;

-        pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();

-    }

-

-    // Load hashBestChain pointer to end of best chain

-    if (!ReadHashBestChain(hashBestChain))

-    {

-        if (pindexGenesisBlock == NULL)

-            return true;

-        return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");

-    }

-    if (!mapBlockIndex.count(hashBestChain))

-        return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");

-    pindexBest = mapBlockIndex[hashBestChain];

-    nBestHeight = pindexBest->nHeight;

-    bnBestChainWork = pindexBest->bnChainWork;

-    printf("LoadBlockIndex(): hashBestChain=%s  height=%d\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight);

-

-    // Load bnBestInvalidWork, OK if it doesn't exist

-    ReadBestInvalidWork(bnBestInvalidWork);

-

-    // Verify blocks in the best chain

-    CBlockIndex* pindexFork = NULL;

-    for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)

-    {

-        if (pindex->nHeight < 74000 && !mapArgs.count("-checkblocks"))

-            break;

-        CBlock block;

-        if (!block.ReadFromDisk(pindex))

-            return error("LoadBlockIndex() : block.ReadFromDisk failed");

-        if (!block.CheckBlock())

-        {

-            printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());

-            pindexFork = pindex->pprev;

-        }

-    }

-    if (pindexFork)

-    {

-        // Reorg back to the fork

-        printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);

-        CBlock block;

-        if (!block.ReadFromDisk(pindexFork))

-            return error("LoadBlockIndex() : block.ReadFromDisk failed");

-        CTxDB txdb;

-        block.SetBestChain(txdb, pindexFork);

-    }

-

-    return true;

-}

-

-

-

-

-

-//

-// CAddrDB

-//

-

-bool CAddrDB::WriteAddress(const CAddress& addr)

-{

-    return Write(make_pair(string("addr"), addr.GetKey()), addr);

-}

-

-bool CAddrDB::LoadAddresses()

-{

-    CRITICAL_BLOCK(cs_mapAddresses)

-    {

-        // Load user provided addresses

-        CAutoFile filein = fopen((GetDataDir() + "/addr.txt").c_str(), "rt");

-        if (filein)

-        {

-            try

-            {

-                char psz[1000];

-                while (fgets(psz, sizeof(psz), filein))

-                {

-                    CAddress addr(psz, NODE_NETWORK);

-                    addr.nTime = 0; // so it won't relay unless successfully connected

-                    if (addr.IsValid())

-                        AddAddress(addr);

-                }

-            }

-            catch (...) { }

-        }

-

-        // Get cursor

-        Dbc* pcursor = GetCursor();

-        if (!pcursor)

-            return false;

-

-        loop

-        {

-            // Read next record

-            CDataStream ssKey;

-            CDataStream ssValue;

-            int ret = ReadAtCursor(pcursor, ssKey, ssValue);

-            if (ret == DB_NOTFOUND)

-                break;

-            else if (ret != 0)

-                return false;

-

-            // Unserialize

-            string strType;

-            ssKey >> strType;

-            if (strType == "addr")

-            {

-                CAddress addr;

-                ssValue >> addr;

-                mapAddresses.insert(make_pair(addr.GetKey(), addr));

-            }

-        }

-        pcursor->close();

-

-        printf("Loaded %d addresses\n", mapAddresses.size());

-

-        // Fix for possible bug that manifests in mapAddresses.count in irc.cpp,

-        // just need to call count here and it doesn't happen there.  The bug was the

-        // pack pragma in irc.cpp and has been fixed, but I'm not in a hurry to delete this.

-        mapAddresses.count(vector<unsigned char>(18));

-    }

-

-    return true;

-}

-

-bool LoadAddresses()

-{

-    return CAddrDB("cr+").LoadAddresses();

-}

-

-

-

-

-//

-// CWalletDB

-//

-

-bool CWalletDB::LoadWallet()

-{

-    vchDefaultKey.clear();

-    int nFileVersion = 0;

-

-    // Modify defaults

-#ifndef __WXMSW__

-    // Tray icon sometimes disappears on 9.10 karmic koala 64-bit, leaving no way to access the program

-    fMinimizeToTray = false;

-    fMinimizeOnClose = false;

-#endif

-

-    //// todo: shouldn't we catch exceptions and try to recover and continue?

-    CRITICAL_BLOCK(cs_mapKeys)

-    CRITICAL_BLOCK(cs_mapWallet)

-    {

-        // Get cursor

-        Dbc* pcursor = GetCursor();

-        if (!pcursor)

-            return false;

-

-        loop

-        {

-            // Read next record

-            CDataStream ssKey;

-            CDataStream ssValue;

-            int ret = ReadAtCursor(pcursor, ssKey, ssValue);

-            if (ret == DB_NOTFOUND)

-                break;

-            else if (ret != 0)

-                return false;

-

-            // Unserialize

-            // Taking advantage of the fact that pair serialization

-            // is just the two items serialized one after the other

-            string strType;

-            ssKey >> strType;

-            if (strType == "name")

-            {

-                string strAddress;

-                ssKey >> strAddress;

-                ssValue >> mapAddressBook[strAddress];

-            }

-            else if (strType == "tx")

-            {

-                uint256 hash;

-                ssKey >> hash;

-                CWalletTx& wtx = mapWallet[hash];

-                ssValue >> wtx;

-

-                if (wtx.GetHash() != hash)

-                    printf("Error in wallet.dat, hash mismatch\n");

-

-                //// debug print

-                //printf("LoadWallet  %s\n", wtx.GetHash().ToString().c_str());

-                //printf(" %12I64d  %s  %s  %s\n",

-                //    wtx.vout[0].nValue,

-                //    DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),

-                //    wtx.hashBlock.ToString().substr(0,20).c_str(),

-                //    wtx.mapValue["message"].c_str());

-            }

-            else if (strType == "key" || strType == "wkey")

-            {

-                vector<unsigned char> vchPubKey;

-                ssKey >> vchPubKey;

-                CWalletKey wkey;

-                if (strType == "key")

-                    ssValue >> wkey.vchPrivKey;

-                else

-                    ssValue >> wkey;

-

-                mapKeys[vchPubKey] = wkey.vchPrivKey;

-                mapPubKeys[Hash160(vchPubKey)] = vchPubKey;

-            }

-            else if (strType == "defaultkey")

-            {

-                ssValue >> vchDefaultKey;

-            }

-            else if (strType == "version")

-            {

-                ssValue >> nFileVersion;

-                if (nFileVersion == 10300)

-                    nFileVersion = 300;

-            }

-            else if (strType == "setting")

-            {

-                string strKey;

-                ssKey >> strKey;

-

-                // Menu state

-                if (strKey == "fGenerateBitcoins")  ssValue >> fGenerateBitcoins;

-

-                // Options

-                if (strKey == "nTransactionFee")    ssValue >> nTransactionFee;

-                if (strKey == "addrIncoming")       ssValue >> addrIncoming;

-                if (strKey == "fLimitProcessors")   ssValue >> fLimitProcessors;

-                if (strKey == "nLimitProcessors")   ssValue >> nLimitProcessors;

-                if (strKey == "fMinimizeToTray")    ssValue >> fMinimizeToTray;

-                if (strKey == "fMinimizeOnClose")   ssValue >> fMinimizeOnClose;

-                if (strKey == "fUseProxy")          ssValue >> fUseProxy;

-                if (strKey == "addrProxy")          ssValue >> addrProxy;

-

-            }

-        }

-        pcursor->close();

-    }

-

-    printf("nFileVersion = %d\n", nFileVersion);

-    printf("fGenerateBitcoins = %d\n", fGenerateBitcoins);

-    printf("nTransactionFee = %"PRI64d"\n", nTransactionFee);

-    printf("addrIncoming = %s\n", addrIncoming.ToString().c_str());

-    printf("fMinimizeToTray = %d\n", fMinimizeToTray);

-    printf("fMinimizeOnClose = %d\n", fMinimizeOnClose);

-    printf("fUseProxy = %d\n", fUseProxy);

-    printf("addrProxy = %s\n", addrProxy.ToString().c_str());

-

-

-    // The transaction fee setting won't be needed for many years to come.

-    // Setting it to zero here in case they set it to something in an earlier version.

-    if (nTransactionFee != 0)

-    {

-        nTransactionFee = 0;

-        WriteSetting("nTransactionFee", nTransactionFee);

-    }

-

-    // Upgrade

-    if (nFileVersion < VERSION)

-    {

-        // Get rid of old debug.log file in current directory

-        if (nFileVersion <= 105 && !pszSetDataDir[0])

-            unlink("debug.log");

-

-        WriteVersion(VERSION);

-    }

-

-    return true;

-}

-

-bool LoadWallet(bool& fFirstRunRet)

-{

-    fFirstRunRet = false;

-    if (!CWalletDB("cr+").LoadWallet())

-        return false;

-    fFirstRunRet = vchDefaultKey.empty();

-

-    if (mapKeys.count(vchDefaultKey))

-    {

-        // Set keyUser

-        keyUser.SetPubKey(vchDefaultKey);

-        keyUser.SetPrivKey(mapKeys[vchDefaultKey]);

-    }

-    else

-    {

-        // Create new keyUser and set as default key

-        RandAddSeedPerfmon();

-        keyUser.MakeNewKey();

-        if (!AddKey(keyUser))

-            return false;

-        if (!SetAddressBookName(PubKeyToAddress(keyUser.GetPubKey()), "Your Address"))

-            return false;

-        CWalletDB().WriteDefaultKey(keyUser.GetPubKey());

-    }

-

-    CreateThread(ThreadFlushWalletDB, NULL);

-    return true;

-}

-

-void ThreadFlushWalletDB(void* parg)

-{

-    static bool fOneThread;

-    if (fOneThread)

-        return;

-    fOneThread = true;

-    if (mapArgs.count("-noflushwallet"))

-        return;

-

-    unsigned int nLastSeen = nWalletDBUpdated;

-    unsigned int nLastFlushed = nWalletDBUpdated;

-    int64 nLastWalletUpdate = GetTime();

-    while (!fShutdown)

-    {

-        Sleep(500);

-

-        if (nLastSeen != nWalletDBUpdated)

-        {

-            nLastSeen = nWalletDBUpdated;

-            nLastWalletUpdate = GetTime();

-        }

-

-        if (nLastFlushed != nWalletDBUpdated && GetTime() - nLastWalletUpdate >= 2)

-        {

-            TRY_CRITICAL_BLOCK(cs_db)

-            {

-                // Don't do this if any databases are in use

-                int nRefCount = 0;

-                map<string, int>::iterator mi = mapFileUseCount.begin();

-                while (mi != mapFileUseCount.end())

-                {

-                    nRefCount += (*mi).second;

-                    mi++;

-                }

-

-                if (nRefCount == 0 && !fShutdown)

-                {

-                    string strFile = "wallet.dat";

-                    map<string, int>::iterator mi = mapFileUseCount.find(strFile);

-                    if (mi != mapFileUseCount.end())

-                    {

-                        printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());

-                        printf("Flushing wallet.dat\n");

-                        nLastFlushed = nWalletDBUpdated;

-                        int64 nStart = GetTimeMillis();

-

-                        // Flush wallet.dat so it's self contained

-                        CloseDb(strFile);

-                        dbenv.txn_checkpoint(0, 0, 0);

-                        dbenv.lsn_reset(strFile.c_str(), 0);

-

-                        mapFileUseCount.erase(mi++);

-                        printf("Flushed wallet.dat %"PRI64d"ms\n", GetTimeMillis() - nStart);

-                    }

-                }

-            }

-        }

-    }

-}

+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+#include "headers.h"
+
+void ThreadFlushWalletDB(void* parg);
+
+
+unsigned int nWalletDBUpdated;
+
+
+
+
+//
+// CDB
+//
+
+static CCriticalSection cs_db;
+static bool fDbEnvInit = false;
+DbEnv dbenv(0);
+static map<string, int> mapFileUseCount;
+static map<string, Db*> mapDb;
+
+class CDBInit
+{
+public:
+    CDBInit()
+    {
+    }
+    ~CDBInit()
+    {
+        if (fDbEnvInit)
+        {
+            dbenv.close(0);
+            fDbEnvInit = false;
+        }
+    }
+}
+instance_of_cdbinit;
+
+
+CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)
+{
+    int ret;
+    if (pszFile == NULL)
+        return;
+
+    fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
+    bool fCreate = strchr(pszMode, 'c');
+    unsigned int nFlags = DB_THREAD;
+    if (fCreate)
+        nFlags |= DB_CREATE;
+
+    CRITICAL_BLOCK(cs_db)
+    {
+        if (!fDbEnvInit)
+        {
+            if (fShutdown)
+                return;
+            string strDataDir = GetDataDir();
+            string strLogDir = strDataDir + "/database";
+            filesystem::create_directory(strLogDir.c_str());
+            string strErrorFile = strDataDir + "/db.log";
+            printf("dbenv.open strLogDir=%s strErrorFile=%s\n", strLogDir.c_str(), strErrorFile.c_str());
+
+            dbenv.set_lg_dir(strLogDir.c_str());
+            dbenv.set_lg_max(10000000);
+            dbenv.set_lk_max_locks(10000);
+            dbenv.set_lk_max_objects(10000);
+            dbenv.set_errfile(fopen(strErrorFile.c_str(), "a")); /// debug
+            dbenv.set_flags(DB_AUTO_COMMIT, 1);
+            ret = dbenv.open(strDataDir.c_str(),
+                             DB_CREATE     |
+                             DB_INIT_LOCK  |
+                             DB_INIT_LOG   |
+                             DB_INIT_MPOOL |
+                             DB_INIT_TXN   |
+                             DB_THREAD     |
+                             DB_PRIVATE    |
+                             DB_RECOVER,
+                             S_IRUSR | S_IWUSR);
+            if (ret > 0)
+                throw runtime_error(strprintf("CDB() : error %d opening database environment\n", ret));
+            fDbEnvInit = true;
+        }
+
+        strFile = pszFile;
+        ++mapFileUseCount[strFile];
+        pdb = mapDb[strFile];
+        if (pdb == NULL)
+        {
+            pdb = new Db(&dbenv, 0);
+
+            ret = pdb->open(NULL,      // Txn pointer
+                            pszFile,   // Filename
+                            "main",    // Logical db name
+                            DB_BTREE,  // Database type
+                            nFlags,    // Flags
+                            0);
+
+            if (ret > 0)
+            {
+                delete pdb;
+                pdb = NULL;
+                CRITICAL_BLOCK(cs_db)
+                    --mapFileUseCount[strFile];
+                strFile = "";
+                throw runtime_error(strprintf("CDB() : can't open database file %s, error %d\n", pszFile, ret));
+            }
+
+            if (fCreate && !Exists(string("version")))
+            {
+                bool fTmp = fReadOnly;
+                fReadOnly = false;
+                WriteVersion(VERSION);
+                fReadOnly = fTmp;
+            }
+
+            mapDb[strFile] = pdb;
+        }
+    }
+}
+
+void CDB::Close()
+{
+    if (!pdb)
+        return;
+    if (!vTxn.empty())
+        vTxn.front()->abort();
+    vTxn.clear();
+    pdb = NULL;
+
+    // Flush database activity from memory pool to disk log
+    unsigned int nMinutes = 0;
+    if (strFile == "addr.dat")
+        nMinutes = 2;
+    if (strFile == "blkindex.dat" && IsInitialBlockDownload() && nBestHeight % 500 != 0)
+        nMinutes = 1;
+    dbenv.txn_checkpoint(0, nMinutes, 0);
+
+    CRITICAL_BLOCK(cs_db)
+        --mapFileUseCount[strFile];
+}
+
+void CloseDb(const string& strFile)
+{
+    CRITICAL_BLOCK(cs_db)
+    {
+        if (mapDb[strFile] != NULL)
+        {
+            // Close the database handle
+            Db* pdb = mapDb[strFile];
+            pdb->close(0);
+            delete pdb;
+            mapDb[strFile] = NULL;
+        }
+    }
+}
+
+void DBFlush(bool fShutdown)
+{
+    // Flush log data to the actual data file
+    //  on all files that are not in use
+    printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
+    if (!fDbEnvInit)
+        return;
+    CRITICAL_BLOCK(cs_db)
+    {
+        map<string, int>::iterator mi = mapFileUseCount.begin();
+        while (mi != mapFileUseCount.end())
+        {
+            string strFile = (*mi).first;
+            int nRefCount = (*mi).second;
+            printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
+            if (nRefCount == 0)
+            {
+                // Move log data to the dat file
+                CloseDb(strFile);
+                dbenv.txn_checkpoint(0, 0, 0);
+                printf("%s flush\n", strFile.c_str());
+                dbenv.lsn_reset(strFile.c_str(), 0);
+                mapFileUseCount.erase(mi++);
+            }
+            else
+                mi++;
+        }
+        if (fShutdown)
+        {
+            char** listp;
+            if (mapFileUseCount.empty())
+                dbenv.log_archive(&listp, DB_ARCH_REMOVE);
+            dbenv.close(0);
+            fDbEnvInit = false;
+        }
+    }
+}
+
+
+
+
+
+
+//
+// CTxDB
+//
+
+bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
+{
+    assert(!fClient);
+    txindex.SetNull();
+    return Read(make_pair(string("tx"), hash), txindex);
+}
+
+bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)
+{
+    assert(!fClient);
+    return Write(make_pair(string("tx"), hash), txindex);
+}
+
+bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)
+{
+    assert(!fClient);
+
+    // Add to tx index
+    uint256 hash = tx.GetHash();
+    CTxIndex txindex(pos, tx.vout.size());
+    return Write(make_pair(string("tx"), hash), txindex);
+}
+
+bool CTxDB::EraseTxIndex(const CTransaction& tx)
+{
+    assert(!fClient);
+    uint256 hash = tx.GetHash();
+
+    return Erase(make_pair(string("tx"), hash));
+}
+
+bool CTxDB::ContainsTx(uint256 hash)
+{
+    assert(!fClient);
+    return Exists(make_pair(string("tx"), hash));
+}
+
+bool CTxDB::ReadOwnerTxes(uint160 hash160, int nMinHeight, vector<CTransaction>& vtx)
+{
+    assert(!fClient);
+    vtx.clear();
+
+    // Get cursor
+    Dbc* pcursor = GetCursor();
+    if (!pcursor)
+        return false;
+
+    unsigned int fFlags = DB_SET_RANGE;
+    loop
+    {
+        // Read next record
+        CDataStream ssKey;
+        if (fFlags == DB_SET_RANGE)
+            ssKey << string("owner") << hash160 << CDiskTxPos(0, 0, 0);
+        CDataStream ssValue;
+        int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
+        fFlags = DB_NEXT;
+        if (ret == DB_NOTFOUND)
+            break;
+        else if (ret != 0)
+        {
+            pcursor->close();
+            return false;
+        }
+
+        // Unserialize
+        string strType;
+        uint160 hashItem;
+        CDiskTxPos pos;
+        ssKey >> strType >> hashItem >> pos;
+        int nItemHeight;
+        ssValue >> nItemHeight;
+
+        // Read transaction
+        if (strType != "owner" || hashItem != hash160)
+            break;
+        if (nItemHeight >= nMinHeight)
+        {
+            vtx.resize(vtx.size()+1);
+            if (!vtx.back().ReadFromDisk(pos))
+            {
+                pcursor->close();
+                return false;
+            }
+        }
+    }
+
+    pcursor->close();
+    return true;
+}
+
+bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)
+{
+    assert(!fClient);
+    tx.SetNull();
+    if (!ReadTxIndex(hash, txindex))
+        return false;
+    return (tx.ReadFromDisk(txindex.pos));
+}
+
+bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)
+{
+    CTxIndex txindex;
+    return ReadDiskTx(hash, tx, txindex);
+}
+
+bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)
+{
+    return ReadDiskTx(outpoint.hash, tx, txindex);
+}
+
+bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)
+{
+    CTxIndex txindex;
+    return ReadDiskTx(outpoint.hash, tx, txindex);
+}
+
+bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
+{
+    return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
+}
+
+bool CTxDB::EraseBlockIndex(uint256 hash)
+{
+    return Erase(make_pair(string("blockindex"), hash));
+}
+
+bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
+{
+    return Read(string("hashBestChain"), hashBestChain);
+}
+
+bool CTxDB::WriteHashBestChain(uint256 hashBestChain)
+{
+    return Write(string("hashBestChain"), hashBestChain);
+}
+
+bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
+{
+    return Read(string("bnBestInvalidWork"), bnBestInvalidWork);
+}
+
+bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)
+{
+    return Write(string("bnBestInvalidWork"), bnBestInvalidWork);
+}
+
+CBlockIndex* InsertBlockIndex(uint256 hash)
+{
+    if (hash == 0)
+        return NULL;
+
+    // Return existing
+    map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
+    if (mi != mapBlockIndex.end())
+        return (*mi).second;
+
+    // Create new
+    CBlockIndex* pindexNew = new CBlockIndex();
+    if (!pindexNew)
+        throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");
+    mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
+    pindexNew->phashBlock = &((*mi).first);
+
+    return pindexNew;
+}
+
+bool CTxDB::LoadBlockIndex()
+{
+    // Get database cursor
+    Dbc* pcursor = GetCursor();
+    if (!pcursor)
+        return false;
+
+    // Load mapBlockIndex
+    unsigned int fFlags = DB_SET_RANGE;
+    loop
+    {
+        // Read next record
+        CDataStream ssKey;
+        if (fFlags == DB_SET_RANGE)
+            ssKey << make_pair(string("blockindex"), uint256(0));
+        CDataStream ssValue;
+        int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
+        fFlags = DB_NEXT;
+        if (ret == DB_NOTFOUND)
+            break;
+        else if (ret != 0)
+            return false;
+
+        // Unserialize
+        string strType;
+        ssKey >> strType;
+        if (strType == "blockindex")
+        {
+            CDiskBlockIndex diskindex;
+            ssValue >> diskindex;
+
+            // Construct block index object
+            CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
+            pindexNew->pprev          = InsertBlockIndex(diskindex.hashPrev);
+            pindexNew->pnext          = InsertBlockIndex(diskindex.hashNext);
+            pindexNew->nFile          = diskindex.nFile;
+            pindexNew->nBlockPos      = diskindex.nBlockPos;
+            pindexNew->nHeight        = diskindex.nHeight;
+            pindexNew->nVersion       = diskindex.nVersion;
+            pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
+            pindexNew->nTime          = diskindex.nTime;
+            pindexNew->nBits          = diskindex.nBits;
+            pindexNew->nNonce         = diskindex.nNonce;
+
+            // Watch for genesis block
+            if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
+                pindexGenesisBlock = pindexNew;
+
+            if (!pindexNew->CheckIndex())
+                return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);
+        }
+        else
+        {
+            break;
+        }
+    }
+    pcursor->close();
+
+    // Calculate bnChainWork
+    vector<pair<int, CBlockIndex*> > vSortedByHeight;
+    vSortedByHeight.reserve(mapBlockIndex.size());
+    foreach(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
+    {
+        CBlockIndex* pindex = item.second;
+        vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));
+    }
+    sort(vSortedByHeight.begin(), vSortedByHeight.end());
+    foreach(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
+    {
+        CBlockIndex* pindex = item.second;
+        pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
+    }
+
+    // Load hashBestChain pointer to end of best chain
+    if (!ReadHashBestChain(hashBestChain))
+    {
+        if (pindexGenesisBlock == NULL)
+            return true;
+        return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");
+    }
+    if (!mapBlockIndex.count(hashBestChain))
+        return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");
+    pindexBest = mapBlockIndex[hashBestChain];
+    nBestHeight = pindexBest->nHeight;
+    bnBestChainWork = pindexBest->bnChainWork;
+    printf("LoadBlockIndex(): hashBestChain=%s  height=%d\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight);
+
+    // Load bnBestInvalidWork, OK if it doesn't exist
+    ReadBestInvalidWork(bnBestInvalidWork);
+
+    // Verify blocks in the best chain
+    CBlockIndex* pindexFork = NULL;
+    for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
+    {
+        if (pindex->nHeight < 74000 && !mapArgs.count("-checkblocks"))
+            break;
+        CBlock block;
+        if (!block.ReadFromDisk(pindex))
+            return error("LoadBlockIndex() : block.ReadFromDisk failed");
+        if (!block.CheckBlock())
+        {
+            printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
+            pindexFork = pindex->pprev;
+        }
+    }
+    if (pindexFork)
+    {
+        // Reorg back to the fork
+        printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);
+        CBlock block;
+        if (!block.ReadFromDisk(pindexFork))
+            return error("LoadBlockIndex() : block.ReadFromDisk failed");
+        CTxDB txdb;
+        block.SetBestChain(txdb, pindexFork);
+    }
+
+    return true;
+}
+
+
+
+
+
+//
+// CAddrDB
+//
+
+bool CAddrDB::WriteAddress(const CAddress& addr)
+{
+    return Write(make_pair(string("addr"), addr.GetKey()), addr);
+}
+
+bool CAddrDB::LoadAddresses()
+{
+    CRITICAL_BLOCK(cs_mapAddresses)
+    {
+        // Load user provided addresses
+        CAutoFile filein = fopen((GetDataDir() + "/addr.txt").c_str(), "rt");
+        if (filein)
+        {
+            try
+            {
+                char psz[1000];
+                while (fgets(psz, sizeof(psz), filein))
+                {
+                    CAddress addr(psz, NODE_NETWORK);
+                    addr.nTime = 0; // so it won't relay unless successfully connected
+                    if (addr.IsValid())
+                        AddAddress(addr);
+                }
+            }
+            catch (...) { }
+        }
+
+        // Get cursor
+        Dbc* pcursor = GetCursor();
+        if (!pcursor)
+            return false;
+
+        loop
+        {
+            // Read next record
+            CDataStream ssKey;
+            CDataStream ssValue;
+            int ret = ReadAtCursor(pcursor, ssKey, ssValue);
+            if (ret == DB_NOTFOUND)
+                break;
+            else if (ret != 0)
+                return false;
+
+            // Unserialize
+            string strType;
+            ssKey >> strType;
+            if (strType == "addr")
+            {
+                CAddress addr;
+                ssValue >> addr;
+                mapAddresses.insert(make_pair(addr.GetKey(), addr));
+            }
+        }
+        pcursor->close();
+
+        printf("Loaded %d addresses\n", mapAddresses.size());
+
+        // Fix for possible bug that manifests in mapAddresses.count in irc.cpp,
+        // just need to call count here and it doesn't happen there.  The bug was the
+        // pack pragma in irc.cpp and has been fixed, but I'm not in a hurry to delete this.
+        mapAddresses.count(vector<unsigned char>(18));
+    }
+
+    return true;
+}
+
+bool LoadAddresses()
+{
+    return CAddrDB("cr+").LoadAddresses();
+}
+
+
+
+
+//
+// CWalletDB
+//
+
+bool CWalletDB::LoadWallet()
+{
+    vchDefaultKey.clear();
+    int nFileVersion = 0;
+
+    // Modify defaults
+#ifndef __WXMSW__
+    // Tray icon sometimes disappears on 9.10 karmic koala 64-bit, leaving no way to access the program
+    fMinimizeToTray = false;
+    fMinimizeOnClose = false;
+#endif
+
+    //// todo: shouldn't we catch exceptions and try to recover and continue?
+    CRITICAL_BLOCK(cs_mapKeys)
+    CRITICAL_BLOCK(cs_mapWallet)
+    {
+        // Get cursor
+        Dbc* pcursor = GetCursor();
+        if (!pcursor)
+            return false;
+
+        loop
+        {
+            // Read next record
+            CDataStream ssKey;
+            CDataStream ssValue;
+            int ret = ReadAtCursor(pcursor, ssKey, ssValue);
+            if (ret == DB_NOTFOUND)
+                break;
+            else if (ret != 0)
+                return false;
+
+            // Unserialize
+            // Taking advantage of the fact that pair serialization
+            // is just the two items serialized one after the other
+            string strType;
+            ssKey >> strType;
+            if (strType == "name")
+            {
+                string strAddress;
+                ssKey >> strAddress;
+                ssValue >> mapAddressBook[strAddress];
+            }
+            else if (strType == "tx")
+            {
+                uint256 hash;
+                ssKey >> hash;
+                CWalletTx& wtx = mapWallet[hash];
+                ssValue >> wtx;
+
+                if (wtx.GetHash() != hash)
+                    printf("Error in wallet.dat, hash mismatch\n");
+
+                //// debug print
+                //printf("LoadWallet  %s\n", wtx.GetHash().ToString().c_str());
+                //printf(" %12I64d  %s  %s  %s\n",
+                //    wtx.vout[0].nValue,
+                //    DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
+                //    wtx.hashBlock.ToString().substr(0,20).c_str(),
+                //    wtx.mapValue["message"].c_str());
+            }
+            else if (strType == "key" || strType == "wkey")
+            {
+                vector<unsigned char> vchPubKey;
+                ssKey >> vchPubKey;
+                CWalletKey wkey;
+                if (strType == "key")
+                    ssValue >> wkey.vchPrivKey;
+                else
+                    ssValue >> wkey;
+
+                mapKeys[vchPubKey] = wkey.vchPrivKey;
+                mapPubKeys[Hash160(vchPubKey)] = vchPubKey;
+            }
+            else if (strType == "defaultkey")
+            {
+                ssValue >> vchDefaultKey;
+            }
+            else if (strType == "version")
+            {
+                ssValue >> nFileVersion;
+                if (nFileVersion == 10300)
+                    nFileVersion = 300;
+            }
+            else if (strType == "setting")
+            {
+                string strKey;
+                ssKey >> strKey;
+
+                // Menu state
+                if (strKey == "fGenerateBitcoins")  ssValue >> fGenerateBitcoins;
+
+                // Options
+                if (strKey == "nTransactionFee")    ssValue >> nTransactionFee;
+                if (strKey == "addrIncoming")       ssValue >> addrIncoming;
+                if (strKey == "fLimitProcessors")   ssValue >> fLimitProcessors;
+                if (strKey == "nLimitProcessors")   ssValue >> nLimitProcessors;
+                if (strKey == "fMinimizeToTray")    ssValue >> fMinimizeToTray;
+                if (strKey == "fMinimizeOnClose")   ssValue >> fMinimizeOnClose;
+                if (strKey == "fUseProxy")          ssValue >> fUseProxy;
+                if (strKey == "addrProxy")          ssValue >> addrProxy;
+
+            }
+        }
+        pcursor->close();
+    }
+
+    printf("nFileVersion = %d\n", nFileVersion);
+    printf("fGenerateBitcoins = %d\n", fGenerateBitcoins);
+    printf("nTransactionFee = %"PRI64d"\n", nTransactionFee);
+    printf("addrIncoming = %s\n", addrIncoming.ToString().c_str());
+    printf("fMinimizeToTray = %d\n", fMinimizeToTray);
+    printf("fMinimizeOnClose = %d\n", fMinimizeOnClose);
+    printf("fUseProxy = %d\n", fUseProxy);
+    printf("addrProxy = %s\n", addrProxy.ToString().c_str());
+
+
+    // The transaction fee setting won't be needed for many years to come.
+    // Setting it to zero here in case they set it to something in an earlier version.
+    if (nTransactionFee != 0)
+    {
+        nTransactionFee = 0;
+        WriteSetting("nTransactionFee", nTransactionFee);
+    }
+
+    // Upgrade
+    if (nFileVersion < VERSION)
+    {
+        // Get rid of old debug.log file in current directory
+        if (nFileVersion <= 105 && !pszSetDataDir[0])
+            unlink("debug.log");
+
+        WriteVersion(VERSION);
+    }
+
+    return true;
+}
+
+bool LoadWallet(bool& fFirstRunRet)
+{
+    fFirstRunRet = false;
+    if (!CWalletDB("cr+").LoadWallet())
+        return false;
+    fFirstRunRet = vchDefaultKey.empty();
+
+    if (mapKeys.count(vchDefaultKey))
+    {
+        // Set keyUser
+        keyUser.SetPubKey(vchDefaultKey);
+        keyUser.SetPrivKey(mapKeys[vchDefaultKey]);
+    }
+    else
+    {
+        // Create new keyUser and set as default key
+        RandAddSeedPerfmon();
+        keyUser.MakeNewKey();
+        if (!AddKey(keyUser))
+            return false;
+        if (!SetAddressBookName(PubKeyToAddress(keyUser.GetPubKey()), "Your Address"))
+            return false;
+        CWalletDB().WriteDefaultKey(keyUser.GetPubKey());
+    }
+
+    CreateThread(ThreadFlushWalletDB, NULL);
+    return true;
+}
+
+void ThreadFlushWalletDB(void* parg)
+{
+    static bool fOneThread;
+    if (fOneThread)
+        return;
+    fOneThread = true;
+    if (mapArgs.count("-noflushwallet"))
+        return;
+
+    unsigned int nLastSeen = nWalletDBUpdated;
+    unsigned int nLastFlushed = nWalletDBUpdated;
+    int64 nLastWalletUpdate = GetTime();
+    while (!fShutdown)
+    {
+        Sleep(500);
+
+        if (nLastSeen != nWalletDBUpdated)
+        {
+            nLastSeen = nWalletDBUpdated;
+            nLastWalletUpdate = GetTime();
+        }
+
+        if (nLastFlushed != nWalletDBUpdated && GetTime() - nLastWalletUpdate >= 2)
+        {
+            TRY_CRITICAL_BLOCK(cs_db)
+            {
+                // Don't do this if any databases are in use
+                int nRefCount = 0;
+                map<string, int>::iterator mi = mapFileUseCount.begin();
+                while (mi != mapFileUseCount.end())
+                {
+                    nRefCount += (*mi).second;
+                    mi++;
+                }
+
+                if (nRefCount == 0 && !fShutdown)
+                {
+                    string strFile = "wallet.dat";
+                    map<string, int>::iterator mi = mapFileUseCount.find(strFile);
+                    if (mi != mapFileUseCount.end())
+                    {
+                        printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
+                        printf("Flushing wallet.dat\n");
+                        nLastFlushed = nWalletDBUpdated;
+                        int64 nStart = GetTimeMillis();
+
+                        // Flush wallet.dat so it's self contained
+                        CloseDb(strFile);
+                        dbenv.txn_checkpoint(0, 0, 0);
+                        dbenv.lsn_reset(strFile.c_str(), 0);
+
+                        mapFileUseCount.erase(mi++);
+                        printf("Flushed wallet.dat %"PRI64d"ms\n", GetTimeMillis() - nStart);
+                    }
+                }
+            }
+        }
+    }
+}