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     {
  76         LOCK(cs_db);
  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(1048576);
  91             dbenv.set_lg_max(10485760);
  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             dbenv.log_set_config(DB_LOG_AUTO_REMOVE, 1);
  97             ret = dbenv.open(strDataDir.c_str(),
  98                              DB_CREATE     |
  99                              DB_INIT_LOCK  |
 100                              DB_INIT_LOG   |
 101                              DB_INIT_MPOOL |
 102                              DB_INIT_TXN   |
 103                              DB_THREAD     |
 104                              DB_RECOVER,
 105                              S_IRUSR | S_IWUSR);
 106             if (ret > 0)
 107                 throw runtime_error(strprintf("CDB() : error %d opening database environment", ret));
 108             fDbEnvInit = true;
 109         }
 110
 111         strFile = pszFile;
 112         ++mapFileUseCount[strFile];
 113         pdb = mapDb[strFile];
 114         if (pdb == NULL)
 115         {
 116             pdb = new Db(&dbenv, 0);
 117
 118             ret = pdb->open(NULL,      // Txn pointer
 119                             pszFile,   // Filename
 120                             "main",    // Logical db name
 121                             DB_BTREE,  // Database type
 122                             nFlags,    // Flags
 123                             0);
 124
 125             if (ret > 0)
 126             {
 127                 delete pdb;
 128                 pdb = NULL;
 129                 {
 130                      LOCK(cs_db);
 131                     --mapFileUseCount[strFile];
 132                 }
 133                 strFile = "";
 134                 throw runtime_error(strprintf("CDB() : can't open database file %s, error %d", pszFile, ret));
 135             }
 136
 137             if (fCreate && !Exists(string("version")))
 138             {
 139                 bool fTmp = fReadOnly;
 140                 fReadOnly = false;
 141                 WriteVersion(CLIENT_VERSION);
 142                 fReadOnly = fTmp;
 143             }
 144
 145             mapDb[strFile] = pdb;
 146         }
 147     }
 148 }
 149
 150 void CDB::Close()
 151 {
 152     if (!pdb)
 153         return;
 154     if (!vTxn.empty())
 155         vTxn.front()->abort();
 156     vTxn.clear();
 157     pdb = NULL;
 158
 159     // Flush database activity from memory pool to disk log
 160     unsigned int nMinutes = 0;
 161     if (fReadOnly)
 162         nMinutes = 1;
 163     if (strFile == "addr.dat")
 164         nMinutes = 2;
 165     if (strFile == "blkindex.dat" && IsInitialBlockDownload())
 166         nMinutes = 5;
 167
 168     dbenv.txn_checkpoint(nMinutes ? GetArg("-dblogsize", 100)*1024 : 0, nMinutes, 0);
 169
 170     {
 171         LOCK(cs_db);
 172         --mapFileUseCount[strFile];
 173     }
 174 }
 175
 176 void static CloseDb(const string& strFile)
 177 {
 178     {
 179         LOCK(cs_db);
 180         if (mapDb[strFile] != NULL)
 181         {
 182             // Close the database handle
 183             Db* pdb = mapDb[strFile];
 184             pdb->close(0);
 185             delete pdb;
 186             mapDb[strFile] = NULL;
 187         }
 188     }
 189 }
 190
 191 bool CDB::Rewrite(const string& strFile, const char* pszSkip)
 192 {
 193     while (!fShutdown)
 194     {
 195         {
 196             LOCK(cs_db);
 197             if (!mapFileUseCount.count(strFile) || mapFileUseCount[strFile] == 0)
 198             {
 199                 // Flush log data to the dat file
 200                 CloseDb(strFile);
 201                 dbenv.txn_checkpoint(0, 0, 0);
 202                 dbenv.lsn_reset(strFile.c_str(), 0);
 203                 mapFileUseCount.erase(strFile);
 204
 205                 bool fSuccess = true;
 206                 printf("Rewriting %s...\n", strFile.c_str());
 207                 string strFileRes = strFile + ".rewrite";
 208                 { // surround usage of db with extra {}
 209                     CDB db(strFile.c_str(), "r");
 210                     Db* pdbCopy = new Db(&dbenv, 0);
 211
 212                     int ret = pdbCopy->open(NULL,                 // Txn pointer
 213                                             strFileRes.c_str(),   // Filename
 214                                             "main",    // Logical db name
 215                                             DB_BTREE,  // Database type
 216                                             DB_CREATE,    // Flags
 217                                             0);
 218                     if (ret > 0)
 219                     {
 220                         printf("Cannot create database file %s\n", strFileRes.c_str());
 221                         fSuccess = false;
 222                     }
 223
 224                     Dbc* pcursor = db.GetCursor();
 225                     if (pcursor)
 226                         while (fSuccess)
 227                         {
 228                             CDataStream ssKey;
 229                             CDataStream ssValue;
 230                             int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
 231                             if (ret == DB_NOTFOUND)
 232                             {
 233                                 pcursor->close();
 234                                 break;
 235                             }
 236                             else if (ret != 0)
 237                             {
 238                                 pcursor->close();
 239                                 fSuccess = false;
 240                                 break;
 241                             }
 242                             if (pszSkip &&
 243                                 strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
 244                                 continue;
 245                             if (strncmp(&ssKey[0], "\x07version", 8) == 0)
 246                             {
 247                                 // Update version:
 248                                 ssValue.clear();
 249                                 ssValue << CLIENT_VERSION;
 250                             }
 251                             Dbt datKey(&ssKey[0], ssKey.size());
 252                             Dbt datValue(&ssValue[0], ssValue.size());
 253                             int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
 254                             if (ret2 > 0)
 255                                 fSuccess = false;
 256                         }
 257                     if (fSuccess)
 258                     {
 259                         db.Close();
 260                         CloseDb(strFile);
 261                         if (pdbCopy->close(0))
 262                             fSuccess = false;
 263                         delete pdbCopy;
 264                     }
 265                 }
 266                 if (fSuccess)
 267                 {
 268                     Db dbA(&dbenv, 0);
 269                     if (dbA.remove(strFile.c_str(), NULL, 0))
 270                         fSuccess = false;
 271                     Db dbB(&dbenv, 0);
 272                     if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
 273                         fSuccess = false;
 274                 }
 275                 if (!fSuccess)
 276                     printf("Rewriting of %s FAILED!\n", strFileRes.c_str());
 277                 return fSuccess;
 278             }
 279         }
 280         Sleep(100);
 281     }
 282     return false;
 283 }
 284
 285
 286 void DBFlush(bool fShutdown)
 287 {
 288     // Flush log data to the actual data file
 289     //  on all files that are not in use
 290     printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
 291     if (!fDbEnvInit)
 292         return;
 293     {
 294         LOCK(cs_db);
 295         map<string, int>::iterator mi = mapFileUseCount.begin();
 296         while (mi != mapFileUseCount.end())
 297         {
 298             string strFile = (*mi).first;
 299             int nRefCount = (*mi).second;
 300             printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
 301             if (nRefCount == 0)
 302             {
 303                 // Move log data to the dat file
 304                 CloseDb(strFile);
 305                 dbenv.txn_checkpoint(0, 0, 0);
 306                 printf("%s flush\n", strFile.c_str());
 307                 dbenv.lsn_reset(strFile.c_str(), 0);
 308                 mapFileUseCount.erase(mi++);
 309             }
 310             else
 311                 mi++;
 312         }
 313         if (fShutdown)
 314         {
 315             char** listp;
 316             if (mapFileUseCount.empty())
 317             {
 318                 dbenv.log_archive(&listp, DB_ARCH_REMOVE);
 319                 EnvShutdown();
 320             }
 321         }
 322     }
 323 }
 324
 325
 326
 327
 328
 329
 330 //
 331 // CTxDB
 332 //
 333
 334 bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
 335 {
 336     assert(!fClient);
 337     txindex.SetNull();
 338     return Read(make_pair(string("tx"), hash), txindex);
 339 }
 340
 341 bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)
 342 {
 343     assert(!fClient);
 344     return Write(make_pair(string("tx"), hash), txindex);
 345 }
 346
 347 bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)
 348 {
 349     assert(!fClient);
 350
 351     // Add to tx index
 352     uint256 hash = tx.GetHash();
 353     CTxIndex txindex(pos, tx.vout.size());
 354     return Write(make_pair(string("tx"), hash), txindex);
 355 }
 356
 357 bool CTxDB::EraseTxIndex(const CTransaction& tx)
 358 {
 359     assert(!fClient);
 360     uint256 hash = tx.GetHash();
 361
 362     return Erase(make_pair(string("tx"), hash));
 363 }
 364
 365 bool CTxDB::ContainsTx(uint256 hash)
 366 {
 367     assert(!fClient);
 368     return Exists(make_pair(string("tx"), hash));
 369 }
 370
 371 bool CTxDB::ReadOwnerTxes(uint160 hash160, int nMinHeight, vector<CTransaction>& vtx)
 372 {
 373     assert(!fClient);
 374     vtx.clear();
 375
 376     // Get cursor
 377     Dbc* pcursor = GetCursor();
 378     if (!pcursor)
 379         return false;
 380
 381     unsigned int fFlags = DB_SET_RANGE;
 382     loop
 383     {
 384         // Read next record
 385         CDataStream ssKey;
 386         if (fFlags == DB_SET_RANGE)
 387             ssKey << string("owner") << hash160 << CDiskTxPos(0, 0, 0);
 388         CDataStream ssValue;
 389         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 390         fFlags = DB_NEXT;
 391         if (ret == DB_NOTFOUND)
 392             break;
 393         else if (ret != 0)
 394         {
 395             pcursor->close();
 396             return false;
 397         }
 398
 399         // Unserialize
 400         string strType;
 401         uint160 hashItem;
 402         CDiskTxPos pos;
 403         ssKey >> strType >> hashItem >> pos;
 404         int nItemHeight;
 405         ssValue >> nItemHeight;
 406
 407         // Read transaction
 408         if (strType != "owner" || hashItem != hash160)
 409             break;
 410         if (nItemHeight >= nMinHeight)
 411         {
 412             vtx.resize(vtx.size()+1);
 413             if (!vtx.back().ReadFromDisk(pos))
 414             {
 415                 pcursor->close();
 416                 return false;
 417             }
 418         }
 419     }
 420
 421     pcursor->close();
 422     return true;
 423 }
 424
 425 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)
 426 {
 427     assert(!fClient);
 428     tx.SetNull();
 429     if (!ReadTxIndex(hash, txindex))
 430         return false;
 431     return (tx.ReadFromDisk(txindex.pos));
 432 }
 433
 434 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)
 435 {
 436     CTxIndex txindex;
 437     return ReadDiskTx(hash, tx, txindex);
 438 }
 439
 440 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)
 441 {
 442     return ReadDiskTx(outpoint.hash, tx, txindex);
 443 }
 444
 445 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)
 446 {
 447     CTxIndex txindex;
 448     return ReadDiskTx(outpoint.hash, tx, txindex);
 449 }
 450
 451 bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
 452 {
 453     return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
 454 }
 455
 456 bool CTxDB::EraseBlockIndex(uint256 hash)
 457 {
 458     return Erase(make_pair(string("blockindex"), hash));
 459 }
 460
 461 bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
 462 {
 463     return Read(string("hashBestChain"), hashBestChain);
 464 }
 465
 466 bool CTxDB::WriteHashBestChain(uint256 hashBestChain)
 467 {
 468     return Write(string("hashBestChain"), hashBestChain);
 469 }
 470
 471 bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
 472 {
 473     return Read(string("bnBestInvalidWork"), bnBestInvalidWork);
 474 }
 475
 476 bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)
 477 {
 478     return Write(string("bnBestInvalidWork"), bnBestInvalidWork);
 479 }
 480
 481 CBlockIndex static * InsertBlockIndex(uint256 hash)
 482 {
 483     if (hash == 0)
 484         return NULL;
 485
 486     // Return existing
 487     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
 488     if (mi != mapBlockIndex.end())
 489         return (*mi).second;
 490
 491     // Create new
 492     CBlockIndex* pindexNew = new CBlockIndex();
 493     if (!pindexNew)
 494         throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");
 495     mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
 496     pindexNew->phashBlock = &((*mi).first);
 497
 498     return pindexNew;
 499 }
 500
 501 bool CTxDB::LoadBlockIndex()
 502 {
 503     // Get database cursor
 504     Dbc* pcursor = GetCursor();
 505     if (!pcursor)
 506         return false;
 507
 508     // Load mapBlockIndex
 509     unsigned int fFlags = DB_SET_RANGE;
 510     loop
 511     {
 512         // Read next record
 513         CDataStream ssKey;
 514         if (fFlags == DB_SET_RANGE)
 515             ssKey << make_pair(string("blockindex"), uint256(0));
 516         CDataStream ssValue;
 517         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 518         fFlags = DB_NEXT;
 519         if (ret == DB_NOTFOUND)
 520             break;
 521         else if (ret != 0)
 522             return false;
 523
 524         // Unserialize
 525         string strType;
 526         ssKey >> strType;
 527         if (strType == "blockindex")
 528         {
 529             CDiskBlockIndex diskindex;
 530             ssValue >> diskindex;
 531
 532             // Construct block index object
 533             CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
 534             pindexNew->pprev          = InsertBlockIndex(diskindex.hashPrev);
 535             pindexNew->pnext          = InsertBlockIndex(diskindex.hashNext);
 536             pindexNew->nFile          = diskindex.nFile;
 537             pindexNew->nBlockPos      = diskindex.nBlockPos;
 538             pindexNew->nHeight        = diskindex.nHeight;
 539             pindexNew->nVersion       = diskindex.nVersion;
 540             pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
 541             pindexNew->nTime          = diskindex.nTime;
 542             pindexNew->nBits          = diskindex.nBits;
 543             pindexNew->nNonce         = diskindex.nNonce;
 544
 545             // Watch for genesis block
 546             if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
 547                 pindexGenesisBlock = pindexNew;
 548
 549             if (!pindexNew->CheckIndex())
 550                 return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);
 551         }
 552         else
 553         {
 554             break;
 555         }
 556     }
 557     pcursor->close();
 558
 559     // Calculate bnChainWork
 560     vector<pair<int, CBlockIndex*> > vSortedByHeight;
 561     vSortedByHeight.reserve(mapBlockIndex.size());
 562     BOOST_FOREACH(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
 563     {
 564         CBlockIndex* pindex = item.second;
 565         vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));
 566     }
 567     sort(vSortedByHeight.begin(), vSortedByHeight.end());
 568     BOOST_FOREACH(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
 569     {
 570         CBlockIndex* pindex = item.second;
 571         pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
 572     }
 573
 574     // Load hashBestChain pointer to end of best chain
 575     if (!ReadHashBestChain(hashBestChain))
 576     {
 577         if (pindexGenesisBlock == NULL)
 578             return true;
 579         return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");
 580     }
 581     if (!mapBlockIndex.count(hashBestChain))
 582         return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");
 583     pindexBest = mapBlockIndex[hashBestChain];
 584     nBestHeight = pindexBest->nHeight;
 585     bnBestChainWork = pindexBest->bnChainWork;
 586     printf("LoadBlockIndex(): hashBestChain=%s  height=%d\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight);
 587
 588     // Load bnBestInvalidWork, OK if it doesn't exist
 589     ReadBestInvalidWork(bnBestInvalidWork);
 590
 591     // Verify blocks in the best chain
 592     int nCheckLevel = GetArg("-checklevel", 1);
 593     int nCheckDepth = GetArg( "-checkblocks", 2500);
 594     if (nCheckDepth == 0)
 595         nCheckDepth = 1000000000; // suffices until the year 19000
 596     if (nCheckDepth > nBestHeight)
 597         nCheckDepth = nBestHeight;
 598     printf("Verifying last %i blocks at level %i\n", nCheckDepth, nCheckLevel);
 599     CBlockIndex* pindexFork = NULL;
 600     map<pair<unsigned int, unsigned int>, CBlockIndex*> mapBlockPos;
 601     for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
 602     {
 603         if (pindex->nHeight < nBestHeight-nCheckDepth)
 604             break;
 605         CBlock block;
 606         if (!block.ReadFromDisk(pindex))
 607             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 608         // check level 1: verify block validity
 609         if (nCheckLevel>0 && !block.CheckBlock())
 610         {
 611             printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
 612             pindexFork = pindex->pprev;
 613         }
 614         // check level 2: verify transaction index validity
 615         if (nCheckLevel>1)
 616         {
 617             pair<unsigned int, unsigned int> pos = make_pair(pindex->nFile, pindex->nBlockPos);
 618             mapBlockPos[pos] = pindex;
 619             BOOST_FOREACH(const CTransaction &tx, block.vtx)
 620             {
 621                 uint256 hashTx = tx.GetHash();
 622                 CTxIndex txindex;
 623                 if (ReadTxIndex(hashTx, txindex))
 624                 {
 625                     // check level 3: checker transaction hashes
 626                     if (nCheckLevel>2 || pindex->nFile != txindex.pos.nFile || pindex->nBlockPos != txindex.pos.nBlockPos)
 627                     {
 628                         // either an error or a duplicate transaction
 629                         CTransaction txFound;
 630                         if (!txFound.ReadFromDisk(txindex.pos))
 631                         {
 632                             printf("LoadBlockIndex() : *** cannot read mislocated transaction %s\n", hashTx.ToString().c_str());
 633                             pindexFork = pindex->pprev;
 634                         }
 635                         else
 636                             if (txFound.GetHash() != hashTx) // not a duplicate tx
 637                             {
 638                                 printf("LoadBlockIndex(): *** invalid tx position for %s\n", hashTx.ToString().c_str());
 639                                 pindexFork = pindex->pprev;
 640                             }
 641                     }
 642                     // check level 4: check whether spent txouts were spent within the main chain
 643                     int nOutput = 0;
 644                     if (nCheckLevel>3)
 645                         BOOST_FOREACH(const CDiskTxPos &txpos, txindex.vSpent)
 646                         {
 647                             if (!txpos.IsNull())
 648                             {
 649                                 pair<unsigned int, unsigned int> posFind = make_pair(txpos.nFile, txpos.nBlockPos);
 650                                 if (!mapBlockPos.count(posFind))
 651                                 {
 652                                     printf("LoadBlockIndex(): *** found bad spend at %d, hashBlock=%s, hashTx=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str(), hashTx.ToString().c_str());
 653                                     pindexFork = pindex->pprev;
 654                                 }
 655                                 // check level 6: check whether spent txouts were spent by a valid transaction that consume them
 656                                 if (nCheckLevel>5)
 657                                 {
 658                                     CTransaction txSpend;
 659                                     if (!txSpend.ReadFromDisk(txpos))
 660                                     {
 661                                         printf("LoadBlockIndex(): *** cannot read spending transaction of %s:%i from disk\n", hashTx.ToString().c_str(), nOutput);
 662                                         pindexFork = pindex->pprev;
 663                                     }
 664                                     else if (!txSpend.CheckTransaction())
 665                                     {
 666                                         printf("LoadBlockIndex(): *** spending transaction of %s:%i is invalid\n", hashTx.ToString().c_str(), nOutput);
 667                                         pindexFork = pindex->pprev;
 668                                     }
 669                                     else
 670                                     {
 671                                         bool fFound = false;
 672                                         BOOST_FOREACH(const CTxIn &txin, txSpend.vin)
 673                                             if (txin.prevout.hash == hashTx && txin.prevout.n == nOutput)
 674                                                 fFound = true;
 675                                         if (!fFound)
 676                                         {
 677                                             printf("LoadBlockIndex(): *** spending transaction of %s:%i does not spend it\n", hashTx.ToString().c_str(), nOutput);
 678                                             pindexFork = pindex->pprev;
 679                                         }
 680                                     }
 681                                 }
 682                             }
 683                             nOutput++;
 684                         }
 685                 }
 686                 // check level 5: check whether all prevouts are marked spent
 687                 if (nCheckLevel>4)
 688                      BOOST_FOREACH(const CTxIn &txin, tx.vin)
 689                      {
 690                           CTxIndex txindex;
 691                           if (ReadTxIndex(txin.prevout.hash, txindex))
 692                               if (txindex.vSpent.size()-1 < txin.prevout.n || txindex.vSpent[txin.prevout.n].IsNull())
 693                               {
 694                                   printf("LoadBlockIndex(): *** found unspent prevout %s:%i in %s\n", txin.prevout.hash.ToString().c_str(), txin.prevout.n, hashTx.ToString().c_str());
 695                                   pindexFork = pindex->pprev;
 696                               }
 697                      }
 698             }
 699         }
 700     }
 701     if (pindexFork)
 702     {
 703         // Reorg back to the fork
 704         printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);
 705         CBlock block;
 706         if (!block.ReadFromDisk(pindexFork))
 707             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 708         CTxDB txdb;
 709         block.SetBestChain(txdb, pindexFork);
 710     }
 711
 712     return true;
 713 }
 714
 715
 716
 717
 718
 719 //
 720 // CAddrDB
 721 //
 722
 723 bool CAddrDB::WriteAddrman(const CAddrMan& addrman)
 724 {
 725     return Write(string("addrman"), addrman);
 726 }
 727
 728 bool CAddrDB::LoadAddresses()
 729 {
 730     if (Read(string("addrman"), addrman))
 731     {
 732         printf("Loaded %i addresses\n", addrman.size());
 733         return true;
 734     }
 735
 736     // Read pre-0.6 addr records
 737
 738     vector<CAddress> vAddr;
 739     vector<vector<unsigned char> > vDelete;
 740
 741     // Get cursor
 742     Dbc* pcursor = GetCursor();
 743     if (!pcursor)
 744         return false;
 745
 746     loop
 747     {
 748         // Read next record
 749         CDataStream ssKey;
 750         CDataStream ssValue;
 751         int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 752         if (ret == DB_NOTFOUND)
 753             break;
 754         else if (ret != 0)
 755             return false;
 756
 757         // Unserialize
 758         string strType;
 759         ssKey >> strType;
 760         if (strType == "addr")
 761         {
 762             CAddress addr;
 763             ssValue >> addr;
 764             vAddr.push_back(addr);
 765         }
 766     }
 767     pcursor->close();
 768
 769     addrman.Add(vAddr, CNetAddr("0.0.0.0"));
 770     printf("Loaded %i addresses\n", addrman.size());
 771
 772     // Note: old records left; we ran into hangs-on-startup
 773     // bugs for some users who (we think) were running after
 774     // an unclean shutdown.
 775
 776     return true;
 777 }
 778
 779 bool LoadAddresses()
 780 {
 781     return CAddrDB("cr+").LoadAddresses();
 782 }
 783
 784
 785
 786
 787 //
 788 // CWalletDB
 789 //
 790
 791 bool CWalletDB::WriteName(const string& strAddress, const string& strName)
 792 {
 793     nWalletDBUpdated++;
 794     return Write(make_pair(string("name"), strAddress), strName);
 795 }
 796
 797 bool CWalletDB::EraseName(const string& strAddress)
 798 {
 799     // This should only be used for sending addresses, never for receiving addresses,
 800     // receiving addresses must always have an address book entry if they're not change return.
 801     nWalletDBUpdated++;
 802     return Erase(make_pair(string("name"), strAddress));
 803 }
 804
 805 bool CWalletDB::ReadAccount(const string& strAccount, CAccount& account)
 806 {
 807     account.SetNull();
 808     return Read(make_pair(string("acc"), strAccount), account);
 809 }
 810
 811 bool CWalletDB::WriteAccount(const string& strAccount, const CAccount& account)
 812 {
 813     return Write(make_pair(string("acc"), strAccount), account);
 814 }
 815
 816 bool CWalletDB::WriteAccountingEntry(const CAccountingEntry& acentry)
 817 {
 818     return Write(boost::make_tuple(string("acentry"), acentry.strAccount, ++nAccountingEntryNumber), acentry);
 819 }
 820
 821 int64 CWalletDB::GetAccountCreditDebit(const string& strAccount)
 822 {
 823     list<CAccountingEntry> entries;
 824     ListAccountCreditDebit(strAccount, entries);
 825
 826     int64 nCreditDebit = 0;
 827     BOOST_FOREACH (const CAccountingEntry& entry, entries)
 828         nCreditDebit += entry.nCreditDebit;
 829
 830     return nCreditDebit;
 831 }
 832
 833 void CWalletDB::ListAccountCreditDebit(const string& strAccount, list<CAccountingEntry>& entries)
 834 {
 835     bool fAllAccounts = (strAccount == "*");
 836
 837     Dbc* pcursor = GetCursor();
 838     if (!pcursor)
 839         throw runtime_error("CWalletDB::ListAccountCreditDebit() : cannot create DB cursor");
 840     unsigned int fFlags = DB_SET_RANGE;
 841     loop
 842     {
 843         // Read next record
 844         CDataStream ssKey;
 845         if (fFlags == DB_SET_RANGE)
 846             ssKey << boost::make_tuple(string("acentry"), (fAllAccounts? string("") : strAccount), uint64(0));
 847         CDataStream ssValue;
 848         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 849         fFlags = DB_NEXT;
 850         if (ret == DB_NOTFOUND)
 851             break;
 852         else if (ret != 0)
 853         {
 854             pcursor->close();
 855             throw runtime_error("CWalletDB::ListAccountCreditDebit() : error scanning DB");
 856         }
 857
 858         // Unserialize
 859         string strType;
 860         ssKey >> strType;
 861         if (strType != "acentry")
 862             break;
 863         CAccountingEntry acentry;
 864         ssKey >> acentry.strAccount;
 865         if (!fAllAccounts && acentry.strAccount != strAccount)
 866             break;
 867
 868         ssValue >> acentry;
 869         entries.push_back(acentry);
 870     }
 871
 872     pcursor->close();
 873 }
 874
 875
 876 int CWalletDB::LoadWallet(CWallet* pwallet)
 877 {
 878     pwallet->vchDefaultKey.clear();
 879     int nFileVersion = 0;
 880     vector<uint256> vWalletUpgrade;
 881     bool fIsEncrypted = false;
 882
 883     //// todo: shouldn't we catch exceptions and try to recover and continue?
 884     {
 885         LOCK(pwallet->cs_wallet);
 886         int nMinVersion = 0;
 887         if (Read((string)"minversion", nMinVersion))
 888         {
 889             if (nMinVersion > CLIENT_VERSION)
 890                 return DB_TOO_NEW;
 891             pwallet->LoadMinVersion(nMinVersion);
 892         }
 893
 894         // Get cursor
 895         Dbc* pcursor = GetCursor();
 896         if (!pcursor)
 897         {
 898             printf("Error getting wallet database cursor\n");
 899             return DB_CORRUPT;
 900         }
 901
 902         loop
 903         {
 904             // Read next record
 905             CDataStream ssKey;
 906             CDataStream ssValue;
 907             int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 908             if (ret == DB_NOTFOUND)
 909                 break;
 910             else if (ret != 0)
 911             {
 912                 printf("Error reading next record from wallet database\n");
 913                 return DB_CORRUPT;
 914             }
 915
 916             // Unserialize
 917             // Taking advantage of the fact that pair serialization
 918             // is just the two items serialized one after the other
 919             string strType;
 920             ssKey >> strType;
 921             if (strType == "name")
 922             {
 923                 string strAddress;
 924                 ssKey >> strAddress;
 925                 ssValue >> pwallet->mapAddressBook[strAddress];
 926             }
 927             else if (strType == "tx")
 928             {
 929                 uint256 hash;
 930                 ssKey >> hash;
 931                 CWalletTx& wtx = pwallet->mapWallet[hash];
 932                 ssValue >> wtx;
 933                 wtx.BindWallet(pwallet);
 934
 935                 if (wtx.GetHash() != hash)
 936                     printf("Error in wallet.dat, hash mismatch\n");
 937
 938                 // Undo serialize changes in 31600
 939                 if (31404 <= wtx.fTimeReceivedIsTxTime && wtx.fTimeReceivedIsTxTime <= 31703)
 940                 {
 941                     if (!ssValue.empty())
 942                     {
 943                         char fTmp;
 944                         char fUnused;
 945                         ssValue >> fTmp >> fUnused >> wtx.strFromAccount;
 946                         printf("LoadWallet() upgrading tx ver=%d %d '%s' %s\n", wtx.fTimeReceivedIsTxTime, fTmp, wtx.strFromAccount.c_str(), hash.ToString().c_str());
 947                         wtx.fTimeReceivedIsTxTime = fTmp;
 948                     }
 949                     else
 950                     {
 951                         printf("LoadWallet() repairing tx ver=%d %s\n", wtx.fTimeReceivedIsTxTime, hash.ToString().c_str());
 952                         wtx.fTimeReceivedIsTxTime = 0;
 953                     }
 954                     vWalletUpgrade.push_back(hash);
 955                 }
 956
 957                 //// debug print
 958                 //printf("LoadWallet  %s\n", wtx.GetHash().ToString().c_str());
 959                 //printf(" %12I64d  %s  %s  %s\n",
 960                 //    wtx.vout[0].nValue,
 961                 //    DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
 962                 //    wtx.hashBlock.ToString().substr(0,20).c_str(),
 963                 //    wtx.mapValue["message"].c_str());
 964             }
 965             else if (strType == "acentry")
 966             {
 967                 string strAccount;
 968                 ssKey >> strAccount;
 969                 uint64 nNumber;
 970                 ssKey >> nNumber;
 971                 if (nNumber > nAccountingEntryNumber)
 972                     nAccountingEntryNumber = nNumber;
 973             }
 974             else if (strType == "key" || strType == "wkey")
 975             {
 976                 vector<unsigned char> vchPubKey;
 977                 ssKey >> vchPubKey;
 978                 CKey key;
 979                 if (strType == "key")
 980                 {
 981                     CPrivKey pkey;
 982                     ssValue >> pkey;
 983                     key.SetPubKey(vchPubKey);
 984                     key.SetPrivKey(pkey);
 985                     if (key.GetPubKey() != vchPubKey)
 986                     {
 987                         printf("Error reading wallet database: CPrivKey pubkey inconsistency\n");
 988                         return DB_CORRUPT;
 989                     }
 990                     if (!key.IsValid())
 991                     {
 992                         printf("Error reading wallet database: invalid CPrivKey\n");
 993                         return DB_CORRUPT;
 994                     }
 995                 }
 996                 else
 997                 {
 998                     CWalletKey wkey;
 999                     ssValue >> wkey;
1000                     key.SetPubKey(vchPubKey);
1001                     key.SetPrivKey(wkey.vchPrivKey);
1002                     if (key.GetPubKey() != vchPubKey)
1003                     {
1004                         printf("Error reading wallet database: CWalletKey pubkey inconsistency\n");
1005                         return DB_CORRUPT;
1006                     }
1007                     if (!key.IsValid())
1008                     {
1009                         printf("Error reading wallet database: invalid CWalletKey\n");
1010                         return DB_CORRUPT;
1011                     }
1012                 }
1013                 if (!pwallet->LoadKey(key))
1014                 {
1015                     printf("Error reading wallet database: LoadKey failed\n");
1016                     return DB_CORRUPT;
1017                 }
1018             }
1019             else if (strType == "mkey")
1020             {
1021                 unsigned int nID;
1022                 ssKey >> nID;
1023                 CMasterKey kMasterKey;
1024                 ssValue >> kMasterKey;
1025                 if(pwallet->mapMasterKeys.count(nID) != 0)
1026                 {
1027                     printf("Error reading wallet database: duplicate CMasterKey id %u\n", nID);
1028                     return DB_CORRUPT;
1029                 }
1030                 pwallet->mapMasterKeys[nID] = kMasterKey;
1031                 if (pwallet->nMasterKeyMaxID < nID)
1032                     pwallet->nMasterKeyMaxID = nID;
1033             }
1034             else if (strType == "ckey")
1035             {
1036                 vector<unsigned char> vchPubKey;
1037                 ssKey >> vchPubKey;
1038                 vector<unsigned char> vchPrivKey;
1039                 ssValue >> vchPrivKey;
1040                 if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
1041                 {
1042                     printf("Error reading wallet database: LoadCryptedKey failed\n");
1043                     return DB_CORRUPT;
1044                 }
1045                 fIsEncrypted = true;
1046             }
1047             else if (strType == "defaultkey")
1048             {
1049                 ssValue >> pwallet->vchDefaultKey;
1050             }
1051             else if (strType == "pool")
1052             {
1053                 int64 nIndex;
1054                 ssKey >> nIndex;
1055                 pwallet->setKeyPool.insert(nIndex);
1056             }
1057             else if (strType == "version")
1058             {
1059                 ssValue >> nFileVersion;
1060                 if (nFileVersion == 10300)
1061                     nFileVersion = 300;
1062             }
1063             else if (strType == "cscript")
1064             {
1065                 uint160 hash;
1066                 ssKey >> hash;
1067                 CScript script;
1068                 ssValue >> script;
1069                 if (!pwallet->LoadCScript(script))
1070                 {
1071                     printf("Error reading wallet database: LoadCScript failed\n");
1072                     return DB_CORRUPT;
1073                 }
1074             }
1075         }
1076         pcursor->close();
1077     }
1078
1079     BOOST_FOREACH(uint256 hash, vWalletUpgrade)
1080         WriteTx(hash, pwallet->mapWallet[hash]);
1081
1082     printf("nFileVersion = %d\n", nFileVersion);
1083
1084
1085     // Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
1086     if (fIsEncrypted && (nFileVersion == 40000 || nFileVersion == 50000))
1087         return DB_NEED_REWRITE;
1088
1089     if (nFileVersion < CLIENT_VERSION) // Update
1090     {
1091         // Get rid of old debug.log file in current directory
1092         if (nFileVersion <= 105 && !pszSetDataDir[0])
1093             unlink("debug.log");
1094
1095         WriteVersion(CLIENT_VERSION);
1096     }
1097
1098     return DB_LOAD_OK;
1099 }
1100
1101 void ThreadFlushWalletDB(void* parg)
1102 {
1103     const string& strFile = ((const string*)parg)[0];
1104     static bool fOneThread;
1105     if (fOneThread)
1106         return;
1107     fOneThread = true;
1108     if (!GetBoolArg("-flushwallet", true))
1109         return;
1110
1111     unsigned int nLastSeen = nWalletDBUpdated;
1112     unsigned int nLastFlushed = nWalletDBUpdated;
1113     int64 nLastWalletUpdate = GetTime();
1114     while (!fShutdown)
1115     {
1116         Sleep(500);
1117
1118         if (nLastSeen != nWalletDBUpdated)
1119         {
1120             nLastSeen = nWalletDBUpdated;
1121             nLastWalletUpdate = GetTime();
1122         }
1123
1124         if (nLastFlushed != nWalletDBUpdated && GetTime() - nLastWalletUpdate >= 2)
1125         {
1126             TRY_LOCK(cs_db,lockDb);
1127             if (lockDb)
1128             {
1129                 // Don't do this if any databases are in use
1130                 int nRefCount = 0;
1131                 map<string, int>::iterator mi = mapFileUseCount.begin();
1132                 while (mi != mapFileUseCount.end())
1133                 {
1134                     nRefCount += (*mi).second;
1135                     mi++;
1136                 }
1137
1138                 if (nRefCount == 0 && !fShutdown)
1139                 {
1140                     map<string, int>::iterator mi = mapFileUseCount.find(strFile);
1141                     if (mi != mapFileUseCount.end())
1142                     {
1143                         printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
1144                         printf("Flushing wallet.dat\n");
1145                         nLastFlushed = nWalletDBUpdated;
1146                         int64 nStart = GetTimeMillis();
1147
1148                         // Flush wallet.dat so it's self contained
1149                         CloseDb(strFile);
1150                         dbenv.txn_checkpoint(0, 0, 0);
1151                         dbenv.lsn_reset(strFile.c_str(), 0);
1152
1153                         mapFileUseCount.erase(mi++);
1154                         printf("Flushed wallet.dat %"PRI64d"ms\n", GetTimeMillis() - nStart);
1155                     }
1156                 }
1157             }
1158         }
1159     }
1160 }
1161
1162 bool BackupWallet(const CWallet& wallet, const string& strDest)
1163 {
1164     if (!wallet.fFileBacked)
1165         return false;
1166     while (!fShutdown)
1167     {
1168         {
1169             LOCK(cs_db);
1170             if (!mapFileUseCount.count(wallet.strWalletFile) || mapFileUseCount[wallet.strWalletFile] == 0)
1171             {
1172                 // Flush log data to the dat file
1173                 CloseDb(wallet.strWalletFile);
1174                 dbenv.txn_checkpoint(0, 0, 0);
1175                 dbenv.lsn_reset(wallet.strWalletFile.c_str(), 0);
1176                 mapFileUseCount.erase(wallet.strWalletFile);
1177
1178                 // Copy wallet.dat
1179                 filesystem::path pathSrc(GetDataDir() + "/" + wallet.strWalletFile);
1180                 filesystem::path pathDest(strDest);
1181                 if (filesystem::is_directory(pathDest))
1182                     pathDest = pathDest / wallet.strWalletFile;
1183
1184                 try {
1185 #if BOOST_VERSION >= 104000
1186                     filesystem::copy_file(pathSrc, pathDest, filesystem::copy_option::overwrite_if_exists);
1187 #else
1188                     filesystem::copy_file(pathSrc, pathDest);
1189 #endif
1190                     printf("copied wallet.dat to %s\n", pathDest.string().c_str());
1191                     return true;
1192                 } catch(const filesystem::filesystem_error &e) {
1193                     printf("error copying wallet.dat to %s - %s\n", pathDest.string().c_str(), e.what());
1194                     return false;
1195                 }
1196             }
1197         }
1198         Sleep(100);
1199     }
1200     return false;
1201 }