src/db.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2012 The Bitcoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include "headers.h"
   7 #include "db.h"
   8 #include "net.h"
   9 #include <boost/version.hpp>
  10 #include <boost/filesystem.hpp>
  11 #include <boost/filesystem/fstream.hpp>
  12
  13 using namespace std;
  14 using namespace boost;
  15
  16
  17 unsigned int nWalletDBUpdated;
  18 uint64 nAccountingEntryNumber = 0;
  19
  20
  21
  22 //
  23 // CDB
  24 //
  25
  26 static CCriticalSection cs_db;
  27 static bool fDbEnvInit = false;
  28 DbEnv dbenv(0);
  29 static map<string, int> mapFileUseCount;
  30 static map<string, Db*> mapDb;
  31
  32 static void EnvShutdown()
  33 {
  34     if (!fDbEnvInit)
  35         return;
  36
  37     fDbEnvInit = false;
  38     try
  39     {
  40         dbenv.close(0);
  41     }
  42     catch (const DbException& e)
  43     {
  44         printf("EnvShutdown exception: %s (%d)\n", e.what(), e.get_errno());
  45     }
  46     DbEnv(0).remove(GetDataDir().c_str(), 0);
  47 }
  48
  49 class CDBInit
  50 {
  51 public:
  52     CDBInit()
  53     {
  54     }
  55     ~CDBInit()
  56     {
  57         EnvShutdown();
  58     }
  59 }
  60 instance_of_cdbinit;
  61
  62
  63 CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)
  64 {
  65     int ret;
  66     if (pszFile == NULL)
  67         return;
  68
  69     fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
  70     bool fCreate = strchr(pszMode, 'c');
  71     unsigned int nFlags = DB_THREAD;
  72     if (fCreate)
  73         nFlags |= DB_CREATE;
  74
  75     CRITICAL_BLOCK(cs_db)
  76     {
  77         if (!fDbEnvInit)
  78         {
  79             if (fShutdown)
  80                 return;
  81             string strDataDir = GetDataDir();
  82             string strLogDir = strDataDir + "/database";
  83             filesystem::create_directory(strLogDir.c_str());
  84             string strErrorFile = strDataDir + "/db.log";
  85             printf("dbenv.open strLogDir=%s strErrorFile=%s\n", strLogDir.c_str(), strErrorFile.c_str());
  86
  87             int nDbCache = GetArg("-dbcache", 25);
  88             dbenv.set_lg_dir(strLogDir.c_str());
  89             dbenv.set_cachesize(nDbCache / 1024, (nDbCache % 1024)*1048576, 1);
  90             dbenv.set_lg_bsize(10485760);
  91             dbenv.set_lg_max(104857600);
  92             dbenv.set_lk_max_locks(10000);
  93             dbenv.set_lk_max_objects(10000);
  94             dbenv.set_errfile(fopen(strErrorFile.c_str(), "a")); /// debug
  95             dbenv.set_flags(DB_AUTO_COMMIT, 1);
  96             ret = dbenv.open(strDataDir.c_str(),
  97                              DB_CREATE     |
  98                              DB_INIT_LOCK  |
  99                              DB_INIT_LOG   |
 100                              DB_INIT_MPOOL |
 101                              DB_INIT_TXN   |
 102                              DB_THREAD     |
 103                              DB_RECOVER,
 104                              S_IRUSR | S_IWUSR);
 105             if (ret > 0)
 106                 throw runtime_error(strprintf("CDB() : error %d opening database environment", ret));
 107             fDbEnvInit = true;
 108         }
 109
 110         strFile = pszFile;
 111         ++mapFileUseCount[strFile];
 112         pdb = mapDb[strFile];
 113         if (pdb == NULL)
 114         {
 115             pdb = new Db(&dbenv, 0);
 116
 117             ret = pdb->open(NULL,      // Txn pointer
 118                             pszFile,   // Filename
 119                             "main",    // Logical db name
 120                             DB_BTREE,  // Database type
 121                             nFlags,    // Flags
 122                             0);
 123
 124             if (ret > 0)
 125             {
 126                 delete pdb;
 127                 pdb = NULL;
 128                 CRITICAL_BLOCK(cs_db)
 129                     --mapFileUseCount[strFile];
 130                 strFile = "";
 131                 throw runtime_error(strprintf("CDB() : can't open database file %s, error %d", pszFile, ret));
 132             }
 133
 134             if (fCreate && !Exists(string("version")))
 135             {
 136                 bool fTmp = fReadOnly;
 137                 fReadOnly = false;
 138                 WriteVersion(CLIENT_VERSION);
 139                 fReadOnly = fTmp;
 140             }
 141
 142             mapDb[strFile] = pdb;
 143         }
 144     }
 145 }
 146
 147 void CDB::Close()
 148 {
 149     if (!pdb)
 150         return;
 151     if (!vTxn.empty())
 152         vTxn.front()->abort();
 153     vTxn.clear();
 154     pdb = NULL;
 155
 156     // Flush database activity from memory pool to disk log
 157     unsigned int nMinutes = 0;
 158     if (fReadOnly)
 159         nMinutes = 1;
 160     if (strFile == "addr.dat")
 161         nMinutes = 2;
 162     if (strFile == "blkindex.dat" && IsInitialBlockDownload() && nBestHeight % 5000 != 0)
 163         nMinutes = 1;
 164     dbenv.txn_checkpoint(0, nMinutes, 0);
 165
 166     CRITICAL_BLOCK(cs_db)
 167         --mapFileUseCount[strFile];
 168 }
 169
 170 void static CloseDb(const string& strFile)
 171 {
 172     CRITICAL_BLOCK(cs_db)
 173     {
 174         if (mapDb[strFile] != NULL)
 175         {
 176             // Close the database handle
 177             Db* pdb = mapDb[strFile];
 178             pdb->close(0);
 179             delete pdb;
 180             mapDb[strFile] = NULL;
 181         }
 182     }
 183 }
 184
 185 bool CDB::Rewrite(const string& strFile, const char* pszSkip)
 186 {
 187     while (!fShutdown)
 188     {
 189         CRITICAL_BLOCK(cs_db)
 190         {
 191             if (!mapFileUseCount.count(strFile) || mapFileUseCount[strFile] == 0)
 192             {
 193                 // Flush log data to the dat file
 194                 CloseDb(strFile);
 195                 dbenv.txn_checkpoint(0, 0, 0);
 196                 dbenv.lsn_reset(strFile.c_str(), 0);
 197                 mapFileUseCount.erase(strFile);
 198
 199                 bool fSuccess = true;
 200                 printf("Rewriting %s...\n", strFile.c_str());
 201                 string strFileRes = strFile + ".rewrite";
 202                 { // surround usage of db with extra {}
 203                     CDB db(strFile.c_str(), "r");
 204                     Db* pdbCopy = new Db(&dbenv, 0);
 205
 206                     int ret = pdbCopy->open(NULL,                 // Txn pointer
 207                                             strFileRes.c_str(),   // Filename
 208                                             "main",    // Logical db name
 209                                             DB_BTREE,  // Database type
 210                                             DB_CREATE,    // Flags
 211                                             0);
 212                     if (ret > 0)
 213                     {
 214                         printf("Cannot create database file %s\n", strFileRes.c_str());
 215                         fSuccess = false;
 216                     }
 217
 218                     Dbc* pcursor = db.GetCursor();
 219                     if (pcursor)
 220                         while (fSuccess)
 221                         {
 222                             CDataStream ssKey;
 223                             CDataStream ssValue;
 224                             int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
 225                             if (ret == DB_NOTFOUND)
 226                             {
 227                                 pcursor->close();
 228                                 break;
 229                             }
 230                             else if (ret != 0)
 231                             {
 232                                 pcursor->close();
 233                                 fSuccess = false;
 234                                 break;
 235                             }
 236                             if (pszSkip &&
 237                                 strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
 238                                 continue;
 239                             if (strncmp(&ssKey[0], "\x07version", 8) == 0)
 240                             {
 241                                 // Update version:
 242                                 ssValue.clear();
 243                                 ssValue << CLIENT_VERSION;
 244                             }
 245                             Dbt datKey(&ssKey[0], ssKey.size());
 246                             Dbt datValue(&ssValue[0], ssValue.size());
 247                             int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
 248                             if (ret2 > 0)
 249                                 fSuccess = false;
 250                         }
 251                     if (fSuccess)
 252                     {
 253                         db.Close();
 254                         CloseDb(strFile);
 255                         if (pdbCopy->close(0))
 256                             fSuccess = false;
 257                         delete pdbCopy;
 258                     }
 259                 }
 260                 if (fSuccess)
 261                 {
 262                     Db dbA(&dbenv, 0);
 263                     if (dbA.remove(strFile.c_str(), NULL, 0))
 264                         fSuccess = false;
 265                     Db dbB(&dbenv, 0);
 266                     if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
 267                         fSuccess = false;
 268                 }
 269                 if (!fSuccess)
 270                     printf("Rewriting of %s FAILED!\n", strFileRes.c_str());
 271                 return fSuccess;
 272             }
 273         }
 274         Sleep(100);
 275     }
 276     return false;
 277 }
 278
 279
 280 void DBFlush(bool fShutdown)
 281 {
 282     // Flush log data to the actual data file
 283     //  on all files that are not in use
 284     printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
 285     if (!fDbEnvInit)
 286         return;
 287     CRITICAL_BLOCK(cs_db)
 288     {
 289         map<string, int>::iterator mi = mapFileUseCount.begin();
 290         while (mi != mapFileUseCount.end())
 291         {
 292             string strFile = (*mi).first;
 293             int nRefCount = (*mi).second;
 294             printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
 295             if (nRefCount == 0)
 296             {
 297                 // Move log data to the dat file
 298                 CloseDb(strFile);
 299                 dbenv.txn_checkpoint(0, 0, 0);
 300                 printf("%s flush\n", strFile.c_str());
 301                 dbenv.lsn_reset(strFile.c_str(), 0);
 302                 mapFileUseCount.erase(mi++);
 303             }
 304             else
 305                 mi++;
 306         }
 307         if (fShutdown)
 308         {
 309             char** listp;
 310             if (mapFileUseCount.empty())
 311             {
 312                 dbenv.log_archive(&listp, DB_ARCH_REMOVE);
 313                 EnvShutdown();
 314             }
 315         }
 316     }
 317 }
 318
 319
 320
 321
 322
 323
 324 //
 325 // CTxDB
 326 //
 327
 328 bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
 329 {
 330     assert(!fClient);
 331     txindex.SetNull();
 332     return Read(make_pair(string("tx"), hash), txindex);
 333 }
 334
 335 bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)
 336 {
 337     assert(!fClient);
 338     return Write(make_pair(string("tx"), hash), txindex);
 339 }
 340
 341 bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)
 342 {
 343     assert(!fClient);
 344
 345     // Add to tx index
 346     uint256 hash = tx.GetHash();
 347     CTxIndex txindex(pos, tx.vout.size());
 348     return Write(make_pair(string("tx"), hash), txindex);
 349 }
 350
 351 bool CTxDB::EraseTxIndex(const CTransaction& tx)
 352 {
 353     assert(!fClient);
 354     uint256 hash = tx.GetHash();
 355
 356     return Erase(make_pair(string("tx"), hash));
 357 }
 358
 359 bool CTxDB::ContainsTx(uint256 hash)
 360 {
 361     assert(!fClient);
 362     return Exists(make_pair(string("tx"), hash));
 363 }
 364
 365 bool CTxDB::ReadOwnerTxes(uint160 hash160, int nMinHeight, vector<CTransaction>& vtx)
 366 {
 367     assert(!fClient);
 368     vtx.clear();
 369
 370     // Get cursor
 371     Dbc* pcursor = GetCursor();
 372     if (!pcursor)
 373         return false;
 374
 375     unsigned int fFlags = DB_SET_RANGE;
 376     loop
 377     {
 378         // Read next record
 379         CDataStream ssKey;
 380         if (fFlags == DB_SET_RANGE)
 381             ssKey << string("owner") << hash160 << CDiskTxPos(0, 0, 0);
 382         CDataStream ssValue;
 383         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 384         fFlags = DB_NEXT;
 385         if (ret == DB_NOTFOUND)
 386             break;
 387         else if (ret != 0)
 388         {
 389             pcursor->close();
 390             return false;
 391         }
 392
 393         // Unserialize
 394         string strType;
 395         uint160 hashItem;
 396         CDiskTxPos pos;
 397         ssKey >> strType >> hashItem >> pos;
 398         int nItemHeight;
 399         ssValue >> nItemHeight;
 400
 401         // Read transaction
 402         if (strType != "owner" || hashItem != hash160)
 403             break;
 404         if (nItemHeight >= nMinHeight)
 405         {
 406             vtx.resize(vtx.size()+1);
 407             if (!vtx.back().ReadFromDisk(pos))
 408             {
 409                 pcursor->close();
 410                 return false;
 411             }
 412         }
 413     }
 414
 415     pcursor->close();
 416     return true;
 417 }
 418
 419 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)
 420 {
 421     assert(!fClient);
 422     tx.SetNull();
 423     if (!ReadTxIndex(hash, txindex))
 424         return false;
 425     return (tx.ReadFromDisk(txindex.pos));
 426 }
 427
 428 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)
 429 {
 430     CTxIndex txindex;
 431     return ReadDiskTx(hash, tx, txindex);
 432 }
 433
 434 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)
 435 {
 436     return ReadDiskTx(outpoint.hash, tx, txindex);
 437 }
 438
 439 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)
 440 {
 441     CTxIndex txindex;
 442     return ReadDiskTx(outpoint.hash, tx, txindex);
 443 }
 444
 445 bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
 446 {
 447     return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
 448 }
 449
 450 bool CTxDB::EraseBlockIndex(uint256 hash)
 451 {
 452     return Erase(make_pair(string("blockindex"), hash));
 453 }
 454
 455 bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
 456 {
 457     return Read(string("hashBestChain"), hashBestChain);
 458 }
 459
 460 bool CTxDB::WriteHashBestChain(uint256 hashBestChain)
 461 {
 462     return Write(string("hashBestChain"), hashBestChain);
 463 }
 464
 465 bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
 466 {
 467     return Read(string("bnBestInvalidWork"), bnBestInvalidWork);
 468 }
 469
 470 bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)
 471 {
 472     return Write(string("bnBestInvalidWork"), bnBestInvalidWork);
 473 }
 474
 475 CBlockIndex static * InsertBlockIndex(uint256 hash)
 476 {
 477     if (hash == 0)
 478         return NULL;
 479
 480     // Return existing
 481     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
 482     if (mi != mapBlockIndex.end())
 483         return (*mi).second;
 484
 485     // Create new
 486     CBlockIndex* pindexNew = new CBlockIndex();
 487     if (!pindexNew)
 488         throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");
 489     mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
 490     pindexNew->phashBlock = &((*mi).first);
 491
 492     return pindexNew;
 493 }
 494
 495 bool CTxDB::LoadBlockIndex()
 496 {
 497     // Get database cursor
 498     Dbc* pcursor = GetCursor();
 499     if (!pcursor)
 500         return false;
 501
 502     // Load mapBlockIndex
 503     unsigned int fFlags = DB_SET_RANGE;
 504     loop
 505     {
 506         // Read next record
 507         CDataStream ssKey;
 508         if (fFlags == DB_SET_RANGE)
 509             ssKey << make_pair(string("blockindex"), uint256(0));
 510         CDataStream ssValue;
 511         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 512         fFlags = DB_NEXT;
 513         if (ret == DB_NOTFOUND)
 514             break;
 515         else if (ret != 0)
 516             return false;
 517
 518         // Unserialize
 519         string strType;
 520         ssKey >> strType;
 521         if (strType == "blockindex")
 522         {
 523             CDiskBlockIndex diskindex;
 524             ssValue >> diskindex;
 525
 526             // Construct block index object
 527             CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
 528             pindexNew->pprev          = InsertBlockIndex(diskindex.hashPrev);
 529             pindexNew->pnext          = InsertBlockIndex(diskindex.hashNext);
 530             pindexNew->nFile          = diskindex.nFile;
 531             pindexNew->nBlockPos      = diskindex.nBlockPos;
 532             pindexNew->nHeight        = diskindex.nHeight;
 533             pindexNew->nVersion       = diskindex.nVersion;
 534             pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
 535             pindexNew->nTime          = diskindex.nTime;
 536             pindexNew->nBits          = diskindex.nBits;
 537             pindexNew->nNonce         = diskindex.nNonce;
 538
 539             // Watch for genesis block
 540             if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
 541                 pindexGenesisBlock = pindexNew;
 542
 543             if (!pindexNew->CheckIndex())
 544                 return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);
 545         }
 546         else
 547         {
 548             break;
 549         }
 550     }
 551     pcursor->close();
 552
 553     // Calculate bnChainWork
 554     vector<pair<int, CBlockIndex*> > vSortedByHeight;
 555     vSortedByHeight.reserve(mapBlockIndex.size());
 556     BOOST_FOREACH(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
 557     {
 558         CBlockIndex* pindex = item.second;
 559         vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));
 560     }
 561     sort(vSortedByHeight.begin(), vSortedByHeight.end());
 562     BOOST_FOREACH(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
 563     {
 564         CBlockIndex* pindex = item.second;
 565         pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
 566     }
 567
 568     // Load hashBestChain pointer to end of best chain
 569     if (!ReadHashBestChain(hashBestChain))
 570     {
 571         if (pindexGenesisBlock == NULL)
 572             return true;
 573         return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");
 574     }
 575     if (!mapBlockIndex.count(hashBestChain))
 576         return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");
 577     pindexBest = mapBlockIndex[hashBestChain];
 578     nBestHeight = pindexBest->nHeight;
 579     bnBestChainWork = pindexBest->bnChainWork;
 580     printf("LoadBlockIndex(): hashBestChain=%s  height=%d\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight);
 581
 582     // Load bnBestInvalidWork, OK if it doesn't exist
 583     ReadBestInvalidWork(bnBestInvalidWork);
 584
 585     // Verify blocks in the best chain
 586     CBlockIndex* pindexFork = NULL;
 587     for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
 588     {
 589         if (pindex->nHeight < nBestHeight-2500 && !mapArgs.count("-checkblocks"))
 590             break;
 591         CBlock block;
 592         if (!block.ReadFromDisk(pindex))
 593             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 594         if (!block.CheckBlock())
 595         {
 596             printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
 597             pindexFork = pindex->pprev;
 598         }
 599     }
 600     if (pindexFork)
 601     {
 602         // Reorg back to the fork
 603         printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);
 604         CBlock block;
 605         if (!block.ReadFromDisk(pindexFork))
 606             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 607         CTxDB txdb;
 608         block.SetBestChain(txdb, pindexFork);
 609     }
 610
 611     return true;
 612 }
 613
 614
 615
 616
 617
 618 //
 619 // CAddrDB
 620 //
 621
 622 bool CAddrDB::WriteAddress(const CAddress& addr)
 623 {
 624     return Write(make_pair(string("addr"), addr.GetKey()), addr);
 625 }
 626
 627 bool CAddrDB::WriteAddrman(const CAddrMan& addrman)
 628 {
 629     return Write(string("addrman"), addrman);
 630 }
 631
 632 bool CAddrDB::EraseAddress(const CAddress& addr)
 633 {
 634     return Erase(make_pair(string("addr"), addr.GetKey()));
 635 }
 636
 637 bool CAddrDB::LoadAddresses(bool &fUpdate)
 638 {
 639     bool fAddrMan = false;
 640     if (Read(string("addrman"), addrman))
 641     {
 642         printf("Loaded %i addresses\n", addrman.size());
 643         fAddrMan = true;
 644     }
 645
 646     vector<CAddress> vAddr;
 647
 648     // Get cursor
 649     Dbc* pcursor = GetCursor();
 650     if (!pcursor)
 651         return false;
 652
 653     loop
 654     {
 655         // Read next record
 656         CDataStream ssKey;
 657         CDataStream ssValue;
 658         int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 659         if (ret == DB_NOTFOUND)
 660             break;
 661         else if (ret != 0)
 662             return false;
 663
 664         // Unserialize
 665         string strType;
 666         ssKey >> strType;
 667         if (strType == "addr")
 668         {
 669             if (fAddrMan)
 670                 fUpdate = true;
 671             else
 672             {
 673                 CAddress addr;
 674                 ssValue >> addr;
 675                 vAddr.push_back(addr);
 676             }
 677
 678         }
 679     }
 680     pcursor->close();
 681
 682     if (!fAddrMan)
 683     {
 684         addrman.Add(vAddr, CNetAddr("0.0.0.0"));
 685         printf("Loaded %i addresses\n", addrman.size());
 686     }
 687
 688     return true;
 689 }
 690
 691 bool LoadAddresses()
 692 {
 693     bool fUpdate = false;
 694     bool fRet = CAddrDB("cr+").LoadAddresses(fUpdate);
 695     if (fUpdate)
 696         CDB::Rewrite("addr.dat", "\004addr");
 697     return fRet;
 698 }
 699
 700
 701
 702
 703 //
 704 // CWalletDB
 705 //
 706
 707 bool CWalletDB::WriteName(const string& strAddress, const string& strName)
 708 {
 709     nWalletDBUpdated++;
 710     return Write(make_pair(string("name"), strAddress), strName);
 711 }
 712
 713 bool CWalletDB::EraseName(const string& strAddress)
 714 {
 715     // This should only be used for sending addresses, never for receiving addresses,
 716     // receiving addresses must always have an address book entry if they're not change return.
 717     nWalletDBUpdated++;
 718     return Erase(make_pair(string("name"), strAddress));
 719 }
 720
 721 bool CWalletDB::ReadAccount(const string& strAccount, CAccount& account)
 722 {
 723     account.SetNull();
 724     return Read(make_pair(string("acc"), strAccount), account);
 725 }
 726
 727 bool CWalletDB::WriteAccount(const string& strAccount, const CAccount& account)
 728 {
 729     return Write(make_pair(string("acc"), strAccount), account);
 730 }
 731
 732 bool CWalletDB::WriteAccountingEntry(const CAccountingEntry& acentry)
 733 {
 734     return Write(boost::make_tuple(string("acentry"), acentry.strAccount, ++nAccountingEntryNumber), acentry);
 735 }
 736
 737 int64 CWalletDB::GetAccountCreditDebit(const string& strAccount)
 738 {
 739     list<CAccountingEntry> entries;
 740     ListAccountCreditDebit(strAccount, entries);
 741
 742     int64 nCreditDebit = 0;
 743     BOOST_FOREACH (const CAccountingEntry& entry, entries)
 744         nCreditDebit += entry.nCreditDebit;
 745
 746     return nCreditDebit;
 747 }
 748
 749 void CWalletDB::ListAccountCreditDebit(const string& strAccount, list<CAccountingEntry>& entries)
 750 {
 751     bool fAllAccounts = (strAccount == "*");
 752
 753     Dbc* pcursor = GetCursor();
 754     if (!pcursor)
 755         throw runtime_error("CWalletDB::ListAccountCreditDebit() : cannot create DB cursor");
 756     unsigned int fFlags = DB_SET_RANGE;
 757     loop
 758     {
 759         // Read next record
 760         CDataStream ssKey;
 761         if (fFlags == DB_SET_RANGE)
 762             ssKey << boost::make_tuple(string("acentry"), (fAllAccounts? string("") : strAccount), uint64(0));
 763         CDataStream ssValue;
 764         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 765         fFlags = DB_NEXT;
 766         if (ret == DB_NOTFOUND)
 767             break;
 768         else if (ret != 0)
 769         {
 770             pcursor->close();
 771             throw runtime_error("CWalletDB::ListAccountCreditDebit() : error scanning DB");
 772         }
 773
 774         // Unserialize
 775         string strType;
 776         ssKey >> strType;
 777         if (strType != "acentry")
 778             break;
 779         CAccountingEntry acentry;
 780         ssKey >> acentry.strAccount;
 781         if (!fAllAccounts && acentry.strAccount != strAccount)
 782             break;
 783
 784         ssValue >> acentry;
 785         entries.push_back(acentry);
 786     }
 787
 788     pcursor->close();
 789 }
 790
 791
 792 int CWalletDB::LoadWallet(CWallet* pwallet)
 793 {
 794     pwallet->vchDefaultKey.clear();
 795     int nFileVersion = 0;
 796     vector<uint256> vWalletUpgrade;
 797     bool fIsEncrypted = false;
 798
 799     //// todo: shouldn't we catch exceptions and try to recover and continue?
 800     CRITICAL_BLOCK(pwallet->cs_wallet)
 801     {
 802         // Get cursor
 803         Dbc* pcursor = GetCursor();
 804         if (!pcursor)
 805         {
 806             printf("Error getting wallet database cursor\n");
 807             return DB_CORRUPT;
 808         }
 809
 810         loop
 811         {
 812             // Read next record
 813             CDataStream ssKey;
 814             CDataStream ssValue;
 815             int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 816             if (ret == DB_NOTFOUND)
 817                 break;
 818             else if (ret != 0)
 819             {
 820                 printf("Error reading next record from wallet database\n");
 821                 return DB_CORRUPT;
 822             }
 823
 824             // Unserialize
 825             // Taking advantage of the fact that pair serialization
 826             // is just the two items serialized one after the other
 827             string strType;
 828             ssKey >> strType;
 829             if (strType == "name")
 830             {
 831                 string strAddress;
 832                 ssKey >> strAddress;
 833                 ssValue >> pwallet->mapAddressBook[strAddress];
 834             }
 835             else if (strType == "tx")
 836             {
 837                 uint256 hash;
 838                 ssKey >> hash;
 839                 CWalletTx& wtx = pwallet->mapWallet[hash];
 840                 ssValue >> wtx;
 841                 wtx.BindWallet(pwallet);
 842
 843                 if (wtx.GetHash() != hash)
 844                     printf("Error in wallet.dat, hash mismatch\n");
 845
 846                 // Undo serialize changes in 31600
 847                 if (31404 <= wtx.fTimeReceivedIsTxTime && wtx.fTimeReceivedIsTxTime <= 31703)
 848                 {
 849                     if (!ssValue.empty())
 850                     {
 851                         char fTmp;
 852                         char fUnused;
 853                         ssValue >> fTmp >> fUnused >> wtx.strFromAccount;
 854                         printf("LoadWallet() upgrading tx ver=%d %d '%s' %s\n", wtx.fTimeReceivedIsTxTime, fTmp, wtx.strFromAccount.c_str(), hash.ToString().c_str());
 855                         wtx.fTimeReceivedIsTxTime = fTmp;
 856                     }
 857                     else
 858                     {
 859                         printf("LoadWallet() repairing tx ver=%d %s\n", wtx.fTimeReceivedIsTxTime, hash.ToString().c_str());
 860                         wtx.fTimeReceivedIsTxTime = 0;
 861                     }
 862                     vWalletUpgrade.push_back(hash);
 863                 }
 864
 865                 //// debug print
 866                 //printf("LoadWallet  %s\n", wtx.GetHash().ToString().c_str());
 867                 //printf(" %12I64d  %s  %s  %s\n",
 868                 //    wtx.vout[0].nValue,
 869                 //    DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
 870                 //    wtx.hashBlock.ToString().substr(0,20).c_str(),
 871                 //    wtx.mapValue["message"].c_str());
 872             }
 873             else if (strType == "acentry")
 874             {
 875                 string strAccount;
 876                 ssKey >> strAccount;
 877                 uint64 nNumber;
 878                 ssKey >> nNumber;
 879                 if (nNumber > nAccountingEntryNumber)
 880                     nAccountingEntryNumber = nNumber;
 881             }
 882             else if (strType == "key" || strType == "wkey")
 883             {
 884                 vector<unsigned char> vchPubKey;
 885                 ssKey >> vchPubKey;
 886                 CKey key;
 887                 if (strType == "key")
 888                 {
 889                     CPrivKey pkey;
 890                     ssValue >> pkey;
 891                     key.SetPubKey(vchPubKey);
 892                     key.SetPrivKey(pkey);
 893                     if (key.GetPubKey() != vchPubKey)
 894                     {
 895                         printf("Error reading wallet database: CPrivKey pubkey inconsistency\n");
 896                         return DB_CORRUPT;
 897                     }
 898                     if (!key.IsValid())
 899                     {
 900                         printf("Error reading wallet database: invalid CPrivKey\n");
 901                         return DB_CORRUPT;
 902                     }
 903                 }
 904                 else
 905                 {
 906                     CWalletKey wkey;
 907                     ssValue >> wkey;
 908                     key.SetPubKey(vchPubKey);
 909                     key.SetPrivKey(wkey.vchPrivKey);
 910                     if (key.GetPubKey() != vchPubKey)
 911                     {
 912                         printf("Error reading wallet database: CWalletKey pubkey inconsistency\n");
 913                         return DB_CORRUPT;
 914                     }
 915                     if (!key.IsValid())
 916                     {
 917                         printf("Error reading wallet database: invalid CWalletKey\n");
 918                         return DB_CORRUPT;
 919                     }
 920                 }
 921                 if (!pwallet->LoadKey(key))
 922                 {
 923                     printf("Error reading wallet database: LoadKey failed\n");
 924                     return DB_CORRUPT;
 925                 }
 926             }
 927             else if (strType == "mkey")
 928             {
 929                 unsigned int nID;
 930                 ssKey >> nID;
 931                 CMasterKey kMasterKey;
 932                 ssValue >> kMasterKey;
 933                 if(pwallet->mapMasterKeys.count(nID) != 0)
 934                 {
 935                     printf("Error reading wallet database: duplicate CMasterKey id %u\n", nID);
 936                     return DB_CORRUPT;
 937                 }
 938                 pwallet->mapMasterKeys[nID] = kMasterKey;
 939                 if (pwallet->nMasterKeyMaxID < nID)
 940                     pwallet->nMasterKeyMaxID = nID;
 941             }
 942             else if (strType == "ckey")
 943             {
 944                 vector<unsigned char> vchPubKey;
 945                 ssKey >> vchPubKey;
 946                 vector<unsigned char> vchPrivKey;
 947                 ssValue >> vchPrivKey;
 948                 if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
 949                 {
 950                     printf("Error reading wallet database: LoadCryptedKey failed\n");
 951                     return DB_CORRUPT;
 952                 }
 953                 fIsEncrypted = true;
 954             }
 955             else if (strType == "defaultkey")
 956             {
 957                 ssValue >> pwallet->vchDefaultKey;
 958             }
 959             else if (strType == "pool")
 960             {
 961                 int64 nIndex;
 962                 ssKey >> nIndex;
 963                 pwallet->setKeyPool.insert(nIndex);
 964             }
 965             else if (strType == "version")
 966             {
 967                 ssValue >> nFileVersion;
 968                 if (nFileVersion == 10300)
 969                     nFileVersion = 300;
 970             }
 971             else if (strType == "minversion")
 972             {
 973                 int nMinVersion = 0;
 974                 ssValue >> nMinVersion;
 975                 if (nMinVersion > CLIENT_VERSION)
 976                     return DB_TOO_NEW;
 977                 pwallet->LoadMinVersion(nMinVersion);
 978             }
 979             else if (strType == "cscript")
 980             {
 981                 uint160 hash;
 982                 ssKey >> hash;
 983                 CScript script;
 984                 ssValue >> script;
 985                 if (!pwallet->LoadCScript(script))
 986                 {
 987                     printf("Error reading wallet database: LoadCScript failed\n");
 988                     return DB_CORRUPT;
 989                 }
 990             }
 991         }
 992         pcursor->close();
 993     }
 994
 995     BOOST_FOREACH(uint256 hash, vWalletUpgrade)
 996         WriteTx(hash, pwallet->mapWallet[hash]);
 997
 998     printf("nFileVersion = %d\n", nFileVersion);
 999
1000
1001     // Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
1002     if (fIsEncrypted && (nFileVersion == 40000 || nFileVersion == 50000))
1003         return DB_NEED_REWRITE;
1004
1005     if (nFileVersion < CLIENT_VERSION) // Update
1006     {
1007         // Get rid of old debug.log file in current directory
1008         if (nFileVersion <= 105 && !pszSetDataDir[0])
1009             unlink("debug.log");
1010
1011         WriteVersion(CLIENT_VERSION);
1012     }
1013
1014     return DB_LOAD_OK;
1015 }
1016
1017 void ThreadFlushWalletDB(void* parg)
1018 {
1019     const string& strFile = ((const string*)parg)[0];
1020     static bool fOneThread;
1021     if (fOneThread)
1022         return;
1023     fOneThread = true;
1024     if (!GetBoolArg("-flushwallet", true))
1025         return;
1026
1027     unsigned int nLastSeen = nWalletDBUpdated;
1028     unsigned int nLastFlushed = nWalletDBUpdated;
1029     int64 nLastWalletUpdate = GetTime();
1030     while (!fShutdown)
1031     {
1032         Sleep(500);
1033
1034         if (nLastSeen != nWalletDBUpdated)
1035         {
1036             nLastSeen = nWalletDBUpdated;
1037             nLastWalletUpdate = GetTime();
1038         }
1039
1040         if (nLastFlushed != nWalletDBUpdated && GetTime() - nLastWalletUpdate >= 2)
1041         {
1042             TRY_CRITICAL_BLOCK(cs_db)
1043             {
1044                 // Don't do this if any databases are in use
1045                 int nRefCount = 0;
1046                 map<string, int>::iterator mi = mapFileUseCount.begin();
1047                 while (mi != mapFileUseCount.end())
1048                 {
1049                     nRefCount += (*mi).second;
1050                     mi++;
1051                 }
1052
1053                 if (nRefCount == 0 && !fShutdown)
1054                 {
1055                     map<string, int>::iterator mi = mapFileUseCount.find(strFile);
1056                     if (mi != mapFileUseCount.end())
1057                     {
1058                         printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
1059                         printf("Flushing wallet.dat\n");
1060                         nLastFlushed = nWalletDBUpdated;
1061                         int64 nStart = GetTimeMillis();
1062
1063                         // Flush wallet.dat so it's self contained
1064                         CloseDb(strFile);
1065                         dbenv.txn_checkpoint(0, 0, 0);
1066                         dbenv.lsn_reset(strFile.c_str(), 0);
1067
1068                         mapFileUseCount.erase(mi++);
1069                         printf("Flushed wallet.dat %"PRI64d"ms\n", GetTimeMillis() - nStart);
1070                     }
1071                 }
1072             }
1073         }
1074     }
1075 }
1076
1077 bool BackupWallet(const CWallet& wallet, const string& strDest)
1078 {
1079     if (!wallet.fFileBacked)
1080         return false;
1081     while (!fShutdown)
1082     {
1083         CRITICAL_BLOCK(cs_db)
1084         {
1085             if (!mapFileUseCount.count(wallet.strWalletFile) || mapFileUseCount[wallet.strWalletFile] == 0)
1086             {
1087                 // Flush log data to the dat file
1088                 CloseDb(wallet.strWalletFile);
1089                 dbenv.txn_checkpoint(0, 0, 0);
1090                 dbenv.lsn_reset(wallet.strWalletFile.c_str(), 0);
1091                 mapFileUseCount.erase(wallet.strWalletFile);
1092
1093                 // Copy wallet.dat
1094                 filesystem::path pathSrc(GetDataDir() + "/" + wallet.strWalletFile);
1095                 filesystem::path pathDest(strDest);
1096                 if (filesystem::is_directory(pathDest))
1097                     pathDest = pathDest / wallet.strWalletFile;
1098
1099                 try {
1100 #if BOOST_VERSION >= 104000
1101                     filesystem::copy_file(pathSrc, pathDest, filesystem::copy_option::overwrite_if_exists);
1102 #else
1103                     filesystem::copy_file(pathSrc, pathDest);
1104 #endif
1105                     printf("copied wallet.dat to %s\n", pathDest.string().c_str());
1106                     return true;
1107                 } catch(const filesystem::filesystem_error &e) {
1108                     printf("error copying wallet.dat to %s - %s\n", pathDest.string().c_str(), e.what());
1109                     return false;
1110                 }
1111             }
1112         }
1113         Sleep(100);
1114     }
1115     return false;
1116 }