db.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "headers.h"
   6
   7 void ThreadFlushWalletDB(void* parg);
   8
   9
  10 unsigned int nWalletDBUpdated;
  11
  12
  13
  14
  15 //
  16 // CDB
  17 //
  18
  19 static CCriticalSection cs_db;
  20 static bool fDbEnvInit = false;
  21 DbEnv dbenv(0);
  22 static map<string, int> mapFileUseCount;
  23 static map<string, Db*> mapDb;
  24
  25 class CDBInit
  26 {
  27 public:
  28     CDBInit()
  29     {
  30     }
  31     ~CDBInit()
  32     {
  33         if (fDbEnvInit)
  34         {
  35             dbenv.close(0);
  36             fDbEnvInit = false;
  37         }
  38     }
  39 }
  40 instance_of_cdbinit;
  41
  42
  43 CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)
  44 {
  45     int ret;
  46     if (pszFile == NULL)
  47         return;
  48
  49     fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
  50     bool fCreate = strchr(pszMode, 'c');
  51     unsigned int nFlags = DB_THREAD;
  52     if (fCreate)
  53         nFlags |= DB_CREATE;
  54
  55     CRITICAL_BLOCK(cs_db)
  56     {
  57         if (!fDbEnvInit)
  58         {
  59             if (fShutdown)
  60                 return;
  61             string strDataDir = GetDataDir();
  62             string strLogDir = strDataDir + "/database";
  63             filesystem::create_directory(strLogDir.c_str());
  64             string strErrorFile = strDataDir + "/db.log";
  65             printf("dbenv.open strLogDir=%s strErrorFile=%s\n", strLogDir.c_str(), strErrorFile.c_str());
  66
  67             dbenv.set_lg_dir(strLogDir.c_str());
  68             dbenv.set_lg_max(10000000);
  69             dbenv.set_lk_max_locks(10000);
  70             dbenv.set_lk_max_objects(10000);
  71             dbenv.set_errfile(fopen(strErrorFile.c_str(), "a")); /// debug
  72             dbenv.set_flags(DB_AUTO_COMMIT, 1);
  73             ret = dbenv.open(strDataDir.c_str(),
  74                              DB_CREATE     |
  75                              DB_INIT_LOCK  |
  76                              DB_INIT_LOG   |
  77                              DB_INIT_MPOOL |
  78                              DB_INIT_TXN   |
  79                              DB_THREAD     |
  80                              DB_RECOVER,
  81                              S_IRUSR | S_IWUSR);
  82             if (ret > 0)
  83                 throw runtime_error(strprintf("CDB() : error %d opening database environment", ret));
  84             fDbEnvInit = true;
  85         }
  86
  87         strFile = pszFile;
  88         ++mapFileUseCount[strFile];
  89         pdb = mapDb[strFile];
  90         if (pdb == NULL)
  91         {
  92             pdb = new Db(&dbenv, 0);
  93
  94             ret = pdb->open(NULL,      // Txn pointer
  95                             pszFile,   // Filename
  96                             "main",    // Logical db name
  97                             DB_BTREE,  // Database type
  98                             nFlags,    // Flags
  99                             0);
 100
 101             if (ret > 0)
 102             {
 103                 delete pdb;
 104                 pdb = NULL;
 105                 CRITICAL_BLOCK(cs_db)
 106                     --mapFileUseCount[strFile];
 107                 strFile = "";
 108                 throw runtime_error(strprintf("CDB() : can't open database file %s, error %d", pszFile, ret));
 109             }
 110
 111             if (fCreate && !Exists(string("version")))
 112             {
 113                 bool fTmp = fReadOnly;
 114                 fReadOnly = false;
 115                 WriteVersion(VERSION);
 116                 fReadOnly = fTmp;
 117             }
 118
 119             mapDb[strFile] = pdb;
 120         }
 121     }
 122 }
 123
 124 void CDB::Close()
 125 {
 126     if (!pdb)
 127         return;
 128     if (!vTxn.empty())
 129         vTxn.front()->abort();
 130     vTxn.clear();
 131     pdb = NULL;
 132
 133     // Flush database activity from memory pool to disk log
 134     unsigned int nMinutes = 0;
 135     if (strFile == "addr.dat")
 136         nMinutes = 2;
 137     if (strFile == "blkindex.dat" && IsInitialBlockDownload() && nBestHeight % 500 != 0)
 138         nMinutes = 1;
 139     dbenv.txn_checkpoint(0, nMinutes, 0);
 140
 141     CRITICAL_BLOCK(cs_db)
 142         --mapFileUseCount[strFile];
 143 }
 144
 145 void CloseDb(const string& strFile)
 146 {
 147     CRITICAL_BLOCK(cs_db)
 148     {
 149         if (mapDb[strFile] != NULL)
 150         {
 151             // Close the database handle
 152             Db* pdb = mapDb[strFile];
 153             pdb->close(0);
 154             delete pdb;
 155             mapDb[strFile] = NULL;
 156         }
 157     }
 158 }
 159
 160 void DBFlush(bool fShutdown)
 161 {
 162     // Flush log data to the actual data file
 163     //  on all files that are not in use
 164     printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
 165     if (!fDbEnvInit)
 166         return;
 167     CRITICAL_BLOCK(cs_db)
 168     {
 169         map<string, int>::iterator mi = mapFileUseCount.begin();
 170         while (mi != mapFileUseCount.end())
 171         {
 172             string strFile = (*mi).first;
 173             int nRefCount = (*mi).second;
 174             printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
 175             if (nRefCount == 0)
 176             {
 177                 // Move log data to the dat file
 178                 CloseDb(strFile);
 179                 dbenv.txn_checkpoint(0, 0, 0);
 180                 printf("%s flush\n", strFile.c_str());
 181                 dbenv.lsn_reset(strFile.c_str(), 0);
 182                 mapFileUseCount.erase(mi++);
 183             }
 184             else
 185                 mi++;
 186         }
 187         if (fShutdown)
 188         {
 189             char** listp;
 190             if (mapFileUseCount.empty())
 191                 dbenv.log_archive(&listp, DB_ARCH_REMOVE);
 192             dbenv.close(0);
 193             fDbEnvInit = false;
 194         }
 195     }
 196 }
 197
 198
 199
 200
 201
 202
 203 //
 204 // CTxDB
 205 //
 206
 207 bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
 208 {
 209     assert(!fClient);
 210     txindex.SetNull();
 211     return Read(make_pair(string("tx"), hash), txindex);
 212 }
 213
 214 bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)
 215 {
 216     assert(!fClient);
 217     return Write(make_pair(string("tx"), hash), txindex);
 218 }
 219
 220 bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)
 221 {
 222     assert(!fClient);
 223
 224     // Add to tx index
 225     uint256 hash = tx.GetHash();
 226     CTxIndex txindex(pos, tx.vout.size());
 227     return Write(make_pair(string("tx"), hash), txindex);
 228 }
 229
 230 bool CTxDB::EraseTxIndex(const CTransaction& tx)
 231 {
 232     assert(!fClient);
 233     uint256 hash = tx.GetHash();
 234
 235     return Erase(make_pair(string("tx"), hash));
 236 }
 237
 238 bool CTxDB::ContainsTx(uint256 hash)
 239 {
 240     assert(!fClient);
 241     return Exists(make_pair(string("tx"), hash));
 242 }
 243
 244 bool CTxDB::ReadOwnerTxes(uint160 hash160, int nMinHeight, vector<CTransaction>& vtx)
 245 {
 246     assert(!fClient);
 247     vtx.clear();
 248
 249     // Get cursor
 250     Dbc* pcursor = GetCursor();
 251     if (!pcursor)
 252         return false;
 253
 254     unsigned int fFlags = DB_SET_RANGE;
 255     loop
 256     {
 257         // Read next record
 258         CDataStream ssKey;
 259         if (fFlags == DB_SET_RANGE)
 260             ssKey << string("owner") << hash160 << CDiskTxPos(0, 0, 0);
 261         CDataStream ssValue;
 262         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 263         fFlags = DB_NEXT;
 264         if (ret == DB_NOTFOUND)
 265             break;
 266         else if (ret != 0)
 267         {
 268             pcursor->close();
 269             return false;
 270         }
 271
 272         // Unserialize
 273         string strType;
 274         uint160 hashItem;
 275         CDiskTxPos pos;
 276         ssKey >> strType >> hashItem >> pos;
 277         int nItemHeight;
 278         ssValue >> nItemHeight;
 279
 280         // Read transaction
 281         if (strType != "owner" || hashItem != hash160)
 282             break;
 283         if (nItemHeight >= nMinHeight)
 284         {
 285             vtx.resize(vtx.size()+1);
 286             if (!vtx.back().ReadFromDisk(pos))
 287             {
 288                 pcursor->close();
 289                 return false;
 290             }
 291         }
 292     }
 293
 294     pcursor->close();
 295     return true;
 296 }
 297
 298 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)
 299 {
 300     assert(!fClient);
 301     tx.SetNull();
 302     if (!ReadTxIndex(hash, txindex))
 303         return false;
 304     return (tx.ReadFromDisk(txindex.pos));
 305 }
 306
 307 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)
 308 {
 309     CTxIndex txindex;
 310     return ReadDiskTx(hash, tx, txindex);
 311 }
 312
 313 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)
 314 {
 315     return ReadDiskTx(outpoint.hash, tx, txindex);
 316 }
 317
 318 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)
 319 {
 320     CTxIndex txindex;
 321     return ReadDiskTx(outpoint.hash, tx, txindex);
 322 }
 323
 324 bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
 325 {
 326     return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
 327 }
 328
 329 bool CTxDB::EraseBlockIndex(uint256 hash)
 330 {
 331     return Erase(make_pair(string("blockindex"), hash));
 332 }
 333
 334 bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
 335 {
 336     return Read(string("hashBestChain"), hashBestChain);
 337 }
 338
 339 bool CTxDB::WriteHashBestChain(uint256 hashBestChain)
 340 {
 341     return Write(string("hashBestChain"), hashBestChain);
 342 }
 343
 344 bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
 345 {
 346     return Read(string("bnBestInvalidWork"), bnBestInvalidWork);
 347 }
 348
 349 bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)
 350 {
 351     return Write(string("bnBestInvalidWork"), bnBestInvalidWork);
 352 }
 353
 354 CBlockIndex* InsertBlockIndex(uint256 hash)
 355 {
 356     if (hash == 0)
 357         return NULL;
 358
 359     // Return existing
 360     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
 361     if (mi != mapBlockIndex.end())
 362         return (*mi).second;
 363
 364     // Create new
 365     CBlockIndex* pindexNew = new CBlockIndex();
 366     if (!pindexNew)
 367         throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");
 368     mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
 369     pindexNew->phashBlock = &((*mi).first);
 370
 371     return pindexNew;
 372 }
 373
 374 bool CTxDB::LoadBlockIndex()
 375 {
 376     // Get database cursor
 377     Dbc* pcursor = GetCursor();
 378     if (!pcursor)
 379         return false;
 380
 381     // Load mapBlockIndex
 382     unsigned int fFlags = DB_SET_RANGE;
 383     loop
 384     {
 385         // Read next record
 386         CDataStream ssKey;
 387         if (fFlags == DB_SET_RANGE)
 388             ssKey << make_pair(string("blockindex"), uint256(0));
 389         CDataStream ssValue;
 390         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 391         fFlags = DB_NEXT;
 392         if (ret == DB_NOTFOUND)
 393             break;
 394         else if (ret != 0)
 395             return false;
 396
 397         // Unserialize
 398         string strType;
 399         ssKey >> strType;
 400         if (strType == "blockindex")
 401         {
 402             CDiskBlockIndex diskindex;
 403             ssValue >> diskindex;
 404
 405             // Construct block index object
 406             CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
 407             pindexNew->pprev          = InsertBlockIndex(diskindex.hashPrev);
 408             pindexNew->pnext          = InsertBlockIndex(diskindex.hashNext);
 409             pindexNew->nFile          = diskindex.nFile;
 410             pindexNew->nBlockPos      = diskindex.nBlockPos;
 411             pindexNew->nHeight        = diskindex.nHeight;
 412             pindexNew->nVersion       = diskindex.nVersion;
 413             pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
 414             pindexNew->nTime          = diskindex.nTime;
 415             pindexNew->nBits          = diskindex.nBits;
 416             pindexNew->nNonce         = diskindex.nNonce;
 417
 418             // Watch for genesis block
 419             if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
 420                 pindexGenesisBlock = pindexNew;
 421
 422             if (!pindexNew->CheckIndex())
 423                 return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);
 424         }
 425         else
 426         {
 427             break;
 428         }
 429     }
 430     pcursor->close();
 431
 432     // Calculate bnChainWork
 433     vector<pair<int, CBlockIndex*> > vSortedByHeight;
 434     vSortedByHeight.reserve(mapBlockIndex.size());
 435     foreach(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
 436     {
 437         CBlockIndex* pindex = item.second;
 438         vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));
 439     }
 440     sort(vSortedByHeight.begin(), vSortedByHeight.end());
 441     foreach(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
 442     {
 443         CBlockIndex* pindex = item.second;
 444         pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
 445     }
 446
 447     // Load hashBestChain pointer to end of best chain
 448     if (!ReadHashBestChain(hashBestChain))
 449     {
 450         if (pindexGenesisBlock == NULL)
 451             return true;
 452         return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");
 453     }
 454     if (!mapBlockIndex.count(hashBestChain))
 455         return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");
 456     pindexBest = mapBlockIndex[hashBestChain];
 457     nBestHeight = pindexBest->nHeight;
 458     bnBestChainWork = pindexBest->bnChainWork;
 459     printf("LoadBlockIndex(): hashBestChain=%s  height=%d\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight);
 460
 461     // Load bnBestInvalidWork, OK if it doesn't exist
 462     ReadBestInvalidWork(bnBestInvalidWork);
 463
 464     // Verify blocks in the best chain
 465     CBlockIndex* pindexFork = NULL;
 466     for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
 467     {
 468         if (pindex->nHeight < 74000 && !mapArgs.count("-checkblocks"))
 469             break;
 470         CBlock block;
 471         if (!block.ReadFromDisk(pindex))
 472             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 473         if (!block.CheckBlock())
 474         {
 475             printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
 476             pindexFork = pindex->pprev;
 477         }
 478     }
 479     if (pindexFork)
 480     {
 481         // Reorg back to the fork
 482         printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);
 483         CBlock block;
 484         if (!block.ReadFromDisk(pindexFork))
 485             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 486         CTxDB txdb;
 487         block.SetBestChain(txdb, pindexFork);
 488     }
 489
 490     return true;
 491 }
 492
 493
 494
 495
 496
 497 //
 498 // CAddrDB
 499 //
 500
 501 bool CAddrDB::WriteAddress(const CAddress& addr)
 502 {
 503     return Write(make_pair(string("addr"), addr.GetKey()), addr);
 504 }
 505
 506 bool CAddrDB::LoadAddresses()
 507 {
 508     CRITICAL_BLOCK(cs_mapAddresses)
 509     {
 510         // Load user provided addresses
 511         CAutoFile filein = fopen((GetDataDir() + "/addr.txt").c_str(), "rt");
 512         if (filein)
 513         {
 514             try
 515             {
 516                 char psz[1000];
 517                 while (fgets(psz, sizeof(psz), filein))
 518                 {
 519                     CAddress addr(psz, NODE_NETWORK);
 520                     addr.nTime = 0; // so it won't relay unless successfully connected
 521                     if (addr.IsValid())
 522                         AddAddress(addr);
 523                 }
 524             }
 525             catch (...) { }
 526         }
 527
 528         // Get cursor
 529         Dbc* pcursor = GetCursor();
 530         if (!pcursor)
 531             return false;
 532
 533         loop
 534         {
 535             // Read next record
 536             CDataStream ssKey;
 537             CDataStream ssValue;
 538             int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 539             if (ret == DB_NOTFOUND)
 540                 break;
 541             else if (ret != 0)
 542                 return false;
 543
 544             // Unserialize
 545             string strType;
 546             ssKey >> strType;
 547             if (strType == "addr")
 548             {
 549                 CAddress addr;
 550                 ssValue >> addr;
 551                 mapAddresses.insert(make_pair(addr.GetKey(), addr));
 552             }
 553         }
 554         pcursor->close();
 555
 556         printf("Loaded %d addresses\n", mapAddresses.size());
 557
 558         // Fix for possible bug that manifests in mapAddresses.count in irc.cpp,
 559         // just need to call count here and it doesn't happen there.  The bug was the
 560         // pack pragma in irc.cpp and has been fixed, but I'm not in a hurry to delete this.
 561         mapAddresses.count(vector<unsigned char>(18));
 562     }
 563
 564     return true;
 565 }
 566
 567 bool LoadAddresses()
 568 {
 569     return CAddrDB("cr+").LoadAddresses();
 570 }
 571
 572
 573
 574
 575 //
 576 // CWalletDB
 577 //
 578
 579 bool CWalletDB::LoadWallet()
 580 {
 581     vchDefaultKey.clear();
 582     int nFileVersion = 0;
 583
 584     // Modify defaults
 585 #ifndef __WXMSW__
 586     // Tray icon sometimes disappears on 9.10 karmic koala 64-bit, leaving no way to access the program
 587     fMinimizeToTray = false;
 588     fMinimizeOnClose = false;
 589 #endif
 590
 591     //// todo: shouldn't we catch exceptions and try to recover and continue?
 592     CRITICAL_BLOCK(cs_mapKeys)
 593     CRITICAL_BLOCK(cs_mapWallet)
 594     {
 595         // Get cursor
 596         Dbc* pcursor = GetCursor();
 597         if (!pcursor)
 598             return false;
 599
 600         loop
 601         {
 602             // Read next record
 603             CDataStream ssKey;
 604             CDataStream ssValue;
 605             int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 606             if (ret == DB_NOTFOUND)
 607                 break;
 608             else if (ret != 0)
 609                 return false;
 610
 611             // Unserialize
 612             // Taking advantage of the fact that pair serialization
 613             // is just the two items serialized one after the other
 614             string strType;
 615             ssKey >> strType;
 616             if (strType == "name")
 617             {
 618                 string strAddress;
 619                 ssKey >> strAddress;
 620                 ssValue >> mapAddressBook[strAddress];
 621             }
 622             else if (strType == "tx")
 623             {
 624                 uint256 hash;
 625                 ssKey >> hash;
 626                 CWalletTx& wtx = mapWallet[hash];
 627                 ssValue >> wtx;
 628
 629                 if (wtx.GetHash() != hash)
 630                     printf("Error in wallet.dat, hash mismatch\n");
 631
 632                 //// debug print
 633                 //printf("LoadWallet  %s\n", wtx.GetHash().ToString().c_str());
 634                 //printf(" %12I64d  %s  %s  %s\n",
 635                 //    wtx.vout[0].nValue,
 636                 //    DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
 637                 //    wtx.hashBlock.ToString().substr(0,20).c_str(),
 638                 //    wtx.mapValue["message"].c_str());
 639             }
 640             else if (strType == "key" || strType == "wkey")
 641             {
 642                 vector<unsigned char> vchPubKey;
 643                 ssKey >> vchPubKey;
 644                 CWalletKey wkey;
 645                 if (strType == "key")
 646                     ssValue >> wkey.vchPrivKey;
 647                 else
 648                     ssValue >> wkey;
 649
 650                 mapKeys[vchPubKey] = wkey.vchPrivKey;
 651                 mapPubKeys[Hash160(vchPubKey)] = vchPubKey;
 652             }
 653             else if (strType == "defaultkey")
 654             {
 655                 ssValue >> vchDefaultKey;
 656             }
 657             else if (strType == "version")
 658             {
 659                 ssValue >> nFileVersion;
 660                 if (nFileVersion == 10300)
 661                     nFileVersion = 300;
 662             }
 663             else if (strType == "setting")
 664             {
 665                 string strKey;
 666                 ssKey >> strKey;
 667
 668                 // Menu state
 669                 if (strKey == "fGenerateBitcoins")  ssValue >> fGenerateBitcoins;
 670
 671                 // Options
 672                 if (strKey == "nTransactionFee")    ssValue >> nTransactionFee;
 673                 if (strKey == "addrIncoming")       ssValue >> addrIncoming;
 674                 if (strKey == "fLimitProcessors")   ssValue >> fLimitProcessors;
 675                 if (strKey == "nLimitProcessors")   ssValue >> nLimitProcessors;
 676                 if (strKey == "fMinimizeToTray")    ssValue >> fMinimizeToTray;
 677                 if (strKey == "fMinimizeOnClose")   ssValue >> fMinimizeOnClose;
 678                 if (strKey == "fUseProxy")          ssValue >> fUseProxy;
 679                 if (strKey == "addrProxy")          ssValue >> addrProxy;
 680
 681             }
 682         }
 683         pcursor->close();
 684     }
 685
 686     printf("nFileVersion = %d\n", nFileVersion);
 687     printf("fGenerateBitcoins = %d\n", fGenerateBitcoins);
 688     printf("nTransactionFee = %"PRI64d"\n", nTransactionFee);
 689     printf("addrIncoming = %s\n", addrIncoming.ToString().c_str());
 690     printf("fMinimizeToTray = %d\n", fMinimizeToTray);
 691     printf("fMinimizeOnClose = %d\n", fMinimizeOnClose);
 692     printf("fUseProxy = %d\n", fUseProxy);
 693     printf("addrProxy = %s\n", addrProxy.ToString().c_str());
 694
 695
 696     // The transaction fee setting won't be needed for many years to come.
 697     // Setting it to zero here in case they set it to something in an earlier version.
 698     if (nTransactionFee != 0)
 699     {
 700         nTransactionFee = 0;
 701         WriteSetting("nTransactionFee", nTransactionFee);
 702     }
 703
 704     // Upgrade
 705     if (nFileVersion < VERSION)
 706     {
 707         // Get rid of old debug.log file in current directory
 708         if (nFileVersion <= 105 && !pszSetDataDir[0])
 709             unlink("debug.log");
 710
 711         WriteVersion(VERSION);
 712     }
 713
 714     return true;
 715 }
 716
 717 bool LoadWallet(bool& fFirstRunRet)
 718 {
 719     fFirstRunRet = false;
 720     if (!CWalletDB("cr+").LoadWallet())
 721         return false;
 722     fFirstRunRet = vchDefaultKey.empty();
 723
 724     if (mapKeys.count(vchDefaultKey))
 725     {
 726         // Set keyUser
 727         keyUser.SetPubKey(vchDefaultKey);
 728         keyUser.SetPrivKey(mapKeys[vchDefaultKey]);
 729     }
 730     else
 731     {
 732         // Create new keyUser and set as default key
 733         RandAddSeedPerfmon();
 734         keyUser.MakeNewKey();
 735         if (!AddKey(keyUser))
 736             return false;
 737         if (!SetAddressBookName(PubKeyToAddress(keyUser.GetPubKey()), "Your Address"))
 738             return false;
 739         CWalletDB().WriteDefaultKey(keyUser.GetPubKey());
 740     }
 741
 742     CreateThread(ThreadFlushWalletDB, NULL);
 743     return true;
 744 }
 745
 746 void ThreadFlushWalletDB(void* parg)
 747 {
 748     static bool fOneThread;
 749     if (fOneThread)
 750         return;
 751     fOneThread = true;
 752     if (mapArgs.count("-noflushwallet"))
 753         return;
 754
 755     unsigned int nLastSeen = nWalletDBUpdated;
 756     unsigned int nLastFlushed = nWalletDBUpdated;
 757     int64 nLastWalletUpdate = GetTime();
 758     while (!fShutdown)
 759     {
 760         Sleep(500);
 761
 762         if (nLastSeen != nWalletDBUpdated)
 763         {
 764             nLastSeen = nWalletDBUpdated;
 765             nLastWalletUpdate = GetTime();
 766         }
 767
 768         if (nLastFlushed != nWalletDBUpdated && GetTime() - nLastWalletUpdate >= 2)
 769         {
 770             TRY_CRITICAL_BLOCK(cs_db)
 771             {
 772                 // Don't do this if any databases are in use
 773                 int nRefCount = 0;
 774                 map<string, int>::iterator mi = mapFileUseCount.begin();
 775                 while (mi != mapFileUseCount.end())
 776                 {
 777                     nRefCount += (*mi).second;
 778                     mi++;
 779                 }
 780
 781                 if (nRefCount == 0 && !fShutdown)
 782                 {
 783                     string strFile = "wallet.dat";
 784                     map<string, int>::iterator mi = mapFileUseCount.find(strFile);
 785                     if (mi != mapFileUseCount.end())
 786                     {
 787                         printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
 788                         printf("Flushing wallet.dat\n");
 789                         nLastFlushed = nWalletDBUpdated;
 790                         int64 nStart = GetTimeMillis();
 791
 792                         // Flush wallet.dat so it's self contained
 793                         CloseDb(strFile);
 794                         dbenv.txn_checkpoint(0, 0, 0);
 795                         dbenv.lsn_reset(strFile.c_str(), 0);
 796
 797                         mapFileUseCount.erase(mi++);
 798                         printf("Flushed wallet.dat %"PRI64d"ms\n", GetTimeMillis() - nStart);
 799                     }
 800                 }
 801             }
 802         }
 803     }
 804 }
 805
 806 void BackupWallet(const string& strDest)
 807 {
 808     while (!fShutdown)
 809     {
 810         CRITICAL_BLOCK(cs_db)
 811         {
 812             const string strFile = "wallet.dat";
 813             if (!mapFileUseCount.count(strFile) || mapFileUseCount[strFile] == 0)
 814             {
 815                 // Flush log data to the dat file
 816                 CloseDb(strFile);
 817                 dbenv.txn_checkpoint(0, 0, 0);
 818                 dbenv.lsn_reset(strFile.c_str(), 0);
 819                 mapFileUseCount.erase(strFile);
 820
 821                 // Copy wallet.dat
 822                 filesystem::path pathSrc(GetDataDir() + "/" + strFile);
 823                 filesystem::path pathDest(strDest);
 824                 if (filesystem::is_directory(pathDest))
 825                     pathDest = pathDest / strFile;
 826 #if BOOST_VERSION >= 104000
 827                 filesystem::copy_file(pathSrc, pathDest, filesystem::copy_option::overwrite_if_exists);
 828 #else
 829                 filesystem::copy_file(pathSrc, pathDest);
 830 #endif
 831                 printf("copied wallet.dat to %s\n", pathDest.string().c_str());
 832
 833                 return;
 834             }
 835         }
 836         Sleep(100);
 837     }
 838 }