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().string().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             filesystem::path pathDataDir = GetDataDir();
  82             filesystem::path pathLogDir = pathDataDir / "database";
  83             filesystem::create_directory(pathLogDir);
  84             filesystem::path pathErrorFile = pathDataDir / "db.log";
  85             printf("dbenv.open LogDir=%s ErrorFile=%s\n", pathLogDir.string().c_str(), pathErrorFile.string().c_str());
  86
  87             int nDbCache = GetArg("-dbcache", 25);
  88             dbenv.set_lg_dir(pathLogDir.string().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(pathErrorFile.string().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(pathDataDir.string().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")
 166         nMinutes = 2;
 167     if (strFile == "blkindex.dat" && IsInitialBlockDownload())
 168         nMinutes = 5;
 169
 170     dbenv.txn_checkpoint(nMinutes ? GetArg("-dblogsize", 100)*1024 : 0, nMinutes, 0);
 171
 172     {
 173         LOCK(cs_db);
 174         --mapFileUseCount[strFile];
 175     }
 176 }
 177
 178 void static CloseDb(const string& strFile)
 179 {
 180     {
 181         LOCK(cs_db);
 182         if (mapDb[strFile] != NULL)
 183         {
 184             // Close the database handle
 185             Db* pdb = mapDb[strFile];
 186             pdb->close(0);
 187             delete pdb;
 188             mapDb[strFile] = NULL;
 189         }
 190     }
 191 }
 192
 193 bool CDB::Rewrite(const string& strFile, const char* pszSkip)
 194 {
 195     while (!fShutdown)
 196     {
 197         {
 198             LOCK(cs_db);
 199             if (!mapFileUseCount.count(strFile) || mapFileUseCount[strFile] == 0)
 200             {
 201                 // Flush log data to the dat file
 202                 CloseDb(strFile);
 203                 dbenv.txn_checkpoint(0, 0, 0);
 204                 dbenv.lsn_reset(strFile.c_str(), 0);
 205                 mapFileUseCount.erase(strFile);
 206
 207                 bool fSuccess = true;
 208                 printf("Rewriting %s...\n", strFile.c_str());
 209                 string strFileRes = strFile + ".rewrite";
 210                 { // surround usage of db with extra {}
 211                     CDB db(strFile.c_str(), "r");
 212                     Db* pdbCopy = new Db(&dbenv, 0);
 213
 214                     int ret = pdbCopy->open(NULL,                 // Txn pointer
 215                                             strFileRes.c_str(),   // Filename
 216                                             "main",    // Logical db name
 217                                             DB_BTREE,  // Database type
 218                                             DB_CREATE,    // Flags
 219                                             0);
 220                     if (ret > 0)
 221                     {
 222                         printf("Cannot create database file %s\n", strFileRes.c_str());
 223                         fSuccess = false;
 224                     }
 225
 226                     Dbc* pcursor = db.GetCursor();
 227                     if (pcursor)
 228                         while (fSuccess)
 229                         {
 230                             CDataStream ssKey;
 231                             CDataStream ssValue;
 232                             int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
 233                             if (ret == DB_NOTFOUND)
 234                             {
 235                                 pcursor->close();
 236                                 break;
 237                             }
 238                             else if (ret != 0)
 239                             {
 240                                 pcursor->close();
 241                                 fSuccess = false;
 242                                 break;
 243                             }
 244                             if (pszSkip &&
 245                                 strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
 246                                 continue;
 247                             if (strncmp(&ssKey[0], "\x07version", 8) == 0)
 248                             {
 249                                 // Update version:
 250                                 ssValue.clear();
 251                                 ssValue << CLIENT_VERSION;
 252                             }
 253                             Dbt datKey(&ssKey[0], ssKey.size());
 254                             Dbt datValue(&ssValue[0], ssValue.size());
 255                             int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
 256                             if (ret2 > 0)
 257                                 fSuccess = false;
 258                         }
 259                     if (fSuccess)
 260                     {
 261                         db.Close();
 262                         CloseDb(strFile);
 263                         if (pdbCopy->close(0))
 264                             fSuccess = false;
 265                         delete pdbCopy;
 266                     }
 267                 }
 268                 if (fSuccess)
 269                 {
 270                     Db dbA(&dbenv, 0);
 271                     if (dbA.remove(strFile.c_str(), NULL, 0))
 272                         fSuccess = false;
 273                     Db dbB(&dbenv, 0);
 274                     if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
 275                         fSuccess = false;
 276                 }
 277                 if (!fSuccess)
 278                     printf("Rewriting of %s FAILED!\n", strFileRes.c_str());
 279                 return fSuccess;
 280             }
 281         }
 282         Sleep(100);
 283     }
 284     return false;
 285 }
 286
 287
 288 void DBFlush(bool fShutdown)
 289 {
 290     // Flush log data to the actual data file
 291     //  on all files that are not in use
 292     printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
 293     if (!fDbEnvInit)
 294         return;
 295     {
 296         LOCK(cs_db);
 297         map<string, int>::iterator mi = mapFileUseCount.begin();
 298         while (mi != mapFileUseCount.end())
 299         {
 300             string strFile = (*mi).first;
 301             int nRefCount = (*mi).second;
 302             printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
 303             if (nRefCount == 0)
 304             {
 305                 // Move log data to the dat file
 306                 CloseDb(strFile);
 307                 dbenv.txn_checkpoint(0, 0, 0);
 308                 printf("%s flush\n", strFile.c_str());
 309                 dbenv.lsn_reset(strFile.c_str(), 0);
 310                 mapFileUseCount.erase(mi++);
 311             }
 312             else
 313                 mi++;
 314         }
 315         if (fShutdown)
 316         {
 317             char** listp;
 318             if (mapFileUseCount.empty())
 319             {
 320                 dbenv.log_archive(&listp, DB_ARCH_REMOVE);
 321                 EnvShutdown();
 322             }
 323         }
 324     }
 325 }
 326
 327
 328
 329
 330
 331
 332 //
 333 // CTxDB
 334 //
 335
 336 bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
 337 {
 338     assert(!fClient);
 339     txindex.SetNull();
 340     return Read(make_pair(string("tx"), hash), txindex);
 341 }
 342
 343 bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)
 344 {
 345     assert(!fClient);
 346     return Write(make_pair(string("tx"), hash), txindex);
 347 }
 348
 349 bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)
 350 {
 351     assert(!fClient);
 352
 353     // Add to tx index
 354     uint256 hash = tx.GetHash();
 355     CTxIndex txindex(pos, tx.vout.size());
 356     return Write(make_pair(string("tx"), hash), txindex);
 357 }
 358
 359 bool CTxDB::EraseTxIndex(const CTransaction& tx)
 360 {
 361     assert(!fClient);
 362     uint256 hash = tx.GetHash();
 363
 364     return Erase(make_pair(string("tx"), hash));
 365 }
 366
 367 bool CTxDB::ContainsTx(uint256 hash)
 368 {
 369     assert(!fClient);
 370     return Exists(make_pair(string("tx"), hash));
 371 }
 372
 373 bool CTxDB::ReadOwnerTxes(uint160 hash160, int nMinHeight, vector<CTransaction>& vtx)
 374 {
 375     assert(!fClient);
 376     vtx.clear();
 377
 378     // Get cursor
 379     Dbc* pcursor = GetCursor();
 380     if (!pcursor)
 381         return false;
 382
 383     unsigned int fFlags = DB_SET_RANGE;
 384     loop
 385     {
 386         // Read next record
 387         CDataStream ssKey;
 388         if (fFlags == DB_SET_RANGE)
 389             ssKey << string("owner") << hash160 << CDiskTxPos(0, 0, 0);
 390         CDataStream ssValue;
 391         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 392         fFlags = DB_NEXT;
 393         if (ret == DB_NOTFOUND)
 394             break;
 395         else if (ret != 0)
 396         {
 397             pcursor->close();
 398             return false;
 399         }
 400
 401         // Unserialize
 402         string strType;
 403         uint160 hashItem;
 404         CDiskTxPos pos;
 405         ssKey >> strType >> hashItem >> pos;
 406         int nItemHeight;
 407         ssValue >> nItemHeight;
 408
 409         // Read transaction
 410         if (strType != "owner" || hashItem != hash160)
 411             break;
 412         if (nItemHeight >= nMinHeight)
 413         {
 414             vtx.resize(vtx.size()+1);
 415             if (!vtx.back().ReadFromDisk(pos))
 416             {
 417                 pcursor->close();
 418                 return false;
 419             }
 420         }
 421     }
 422
 423     pcursor->close();
 424     return true;
 425 }
 426
 427 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)
 428 {
 429     assert(!fClient);
 430     tx.SetNull();
 431     if (!ReadTxIndex(hash, txindex))
 432         return false;
 433     return (tx.ReadFromDisk(txindex.pos));
 434 }
 435
 436 bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)
 437 {
 438     CTxIndex txindex;
 439     return ReadDiskTx(hash, tx, txindex);
 440 }
 441
 442 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)
 443 {
 444     return ReadDiskTx(outpoint.hash, tx, txindex);
 445 }
 446
 447 bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)
 448 {
 449     CTxIndex txindex;
 450     return ReadDiskTx(outpoint.hash, tx, txindex);
 451 }
 452
 453 bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
 454 {
 455     return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
 456 }
 457
 458 bool CTxDB::EraseBlockIndex(uint256 hash)
 459 {
 460     return Erase(make_pair(string("blockindex"), hash));
 461 }
 462
 463 bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
 464 {
 465     return Read(string("hashBestChain"), hashBestChain);
 466 }
 467
 468 bool CTxDB::WriteHashBestChain(uint256 hashBestChain)
 469 {
 470     return Write(string("hashBestChain"), hashBestChain);
 471 }
 472
 473 bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
 474 {
 475     return Read(string("bnBestInvalidWork"), bnBestInvalidWork);
 476 }
 477
 478 bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)
 479 {
 480     return Write(string("bnBestInvalidWork"), bnBestInvalidWork);
 481 }
 482
 483 CBlockIndex static * InsertBlockIndex(uint256 hash)
 484 {
 485     if (hash == 0)
 486         return NULL;
 487
 488     // Return existing
 489     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
 490     if (mi != mapBlockIndex.end())
 491         return (*mi).second;
 492
 493     // Create new
 494     CBlockIndex* pindexNew = new CBlockIndex();
 495     if (!pindexNew)
 496         throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");
 497     mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
 498     pindexNew->phashBlock = &((*mi).first);
 499
 500     return pindexNew;
 501 }
 502
 503 bool CTxDB::LoadBlockIndex()
 504 {
 505     // Get database cursor
 506     Dbc* pcursor = GetCursor();
 507     if (!pcursor)
 508         return false;
 509
 510     // Load mapBlockIndex
 511     unsigned int fFlags = DB_SET_RANGE;
 512     loop
 513     {
 514         // Read next record
 515         CDataStream ssKey;
 516         if (fFlags == DB_SET_RANGE)
 517             ssKey << make_pair(string("blockindex"), uint256(0));
 518         CDataStream ssValue;
 519         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 520         fFlags = DB_NEXT;
 521         if (ret == DB_NOTFOUND)
 522             break;
 523         else if (ret != 0)
 524             return false;
 525
 526         // Unserialize
 527         string strType;
 528         ssKey >> strType;
 529         if (strType == "blockindex")
 530         {
 531             CDiskBlockIndex diskindex;
 532             ssValue >> diskindex;
 533
 534             // Construct block index object
 535             CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
 536             pindexNew->pprev          = InsertBlockIndex(diskindex.hashPrev);
 537             pindexNew->pnext          = InsertBlockIndex(diskindex.hashNext);
 538             pindexNew->nFile          = diskindex.nFile;
 539             pindexNew->nBlockPos      = diskindex.nBlockPos;
 540             pindexNew->nHeight        = diskindex.nHeight;
 541             pindexNew->nVersion       = diskindex.nVersion;
 542             pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
 543             pindexNew->nTime          = diskindex.nTime;
 544             pindexNew->nBits          = diskindex.nBits;
 545             pindexNew->nNonce         = diskindex.nNonce;
 546
 547             // Watch for genesis block
 548             if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
 549                 pindexGenesisBlock = pindexNew;
 550
 551             if (!pindexNew->CheckIndex())
 552                 return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);
 553         }
 554         else
 555         {
 556             break;
 557         }
 558     }
 559     pcursor->close();
 560
 561     // Calculate bnChainWork
 562     vector<pair<int, CBlockIndex*> > vSortedByHeight;
 563     vSortedByHeight.reserve(mapBlockIndex.size());
 564     BOOST_FOREACH(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
 565     {
 566         CBlockIndex* pindex = item.second;
 567         vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));
 568     }
 569     sort(vSortedByHeight.begin(), vSortedByHeight.end());
 570     BOOST_FOREACH(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
 571     {
 572         CBlockIndex* pindex = item.second;
 573         pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
 574     }
 575
 576     // Load hashBestChain pointer to end of best chain
 577     if (!ReadHashBestChain(hashBestChain))
 578     {
 579         if (pindexGenesisBlock == NULL)
 580             return true;
 581         return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");
 582     }
 583     if (!mapBlockIndex.count(hashBestChain))
 584         return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");
 585     pindexBest = mapBlockIndex[hashBestChain];
 586     nBestHeight = pindexBest->nHeight;
 587     bnBestChainWork = pindexBest->bnChainWork;
 588     printf("LoadBlockIndex(): hashBestChain=%s  height=%d\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight);
 589
 590     // Load bnBestInvalidWork, OK if it doesn't exist
 591     ReadBestInvalidWork(bnBestInvalidWork);
 592
 593     // Verify blocks in the best chain
 594     int nCheckLevel = GetArg("-checklevel", 1);
 595     int nCheckDepth = GetArg( "-checkblocks", 2500);
 596     if (nCheckDepth == 0)
 597         nCheckDepth = 1000000000; // suffices until the year 19000
 598     if (nCheckDepth > nBestHeight)
 599         nCheckDepth = nBestHeight;
 600     printf("Verifying last %i blocks at level %i\n", nCheckDepth, nCheckLevel);
 601     CBlockIndex* pindexFork = NULL;
 602     map<pair<unsigned int, unsigned int>, CBlockIndex*> mapBlockPos;
 603     for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
 604     {
 605         if (pindex->nHeight < nBestHeight-nCheckDepth)
 606             break;
 607         CBlock block;
 608         if (!block.ReadFromDisk(pindex))
 609             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 610         // check level 1: verify block validity
 611         if (nCheckLevel>0 && !block.CheckBlock())
 612         {
 613             printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
 614             pindexFork = pindex->pprev;
 615         }
 616         // check level 2: verify transaction index validity
 617         if (nCheckLevel>1)
 618         {
 619             pair<unsigned int, unsigned int> pos = make_pair(pindex->nFile, pindex->nBlockPos);
 620             mapBlockPos[pos] = pindex;
 621             BOOST_FOREACH(const CTransaction &tx, block.vtx)
 622             {
 623                 uint256 hashTx = tx.GetHash();
 624                 CTxIndex txindex;
 625                 if (ReadTxIndex(hashTx, txindex))
 626                 {
 627                     // check level 3: checker transaction hashes
 628                     if (nCheckLevel>2 || pindex->nFile != txindex.pos.nFile || pindex->nBlockPos != txindex.pos.nBlockPos)
 629                     {
 630                         // either an error or a duplicate transaction
 631                         CTransaction txFound;
 632                         if (!txFound.ReadFromDisk(txindex.pos))
 633                         {
 634                             printf("LoadBlockIndex() : *** cannot read mislocated transaction %s\n", hashTx.ToString().c_str());
 635                             pindexFork = pindex->pprev;
 636                         }
 637                         else
 638                             if (txFound.GetHash() != hashTx) // not a duplicate tx
 639                             {
 640                                 printf("LoadBlockIndex(): *** invalid tx position for %s\n", hashTx.ToString().c_str());
 641                                 pindexFork = pindex->pprev;
 642                             }
 643                     }
 644                     // check level 4: check whether spent txouts were spent within the main chain
 645                     int nOutput = 0;
 646                     if (nCheckLevel>3)
 647                     {
 648                         BOOST_FOREACH(const CDiskTxPos &txpos, txindex.vSpent)
 649                         {
 650                             if (!txpos.IsNull())
 651                             {
 652                                 pair<unsigned int, unsigned int> posFind = make_pair(txpos.nFile, txpos.nBlockPos);
 653                                 if (!mapBlockPos.count(posFind))
 654                                 {
 655                                     printf("LoadBlockIndex(): *** found bad spend at %d, hashBlock=%s, hashTx=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str(), hashTx.ToString().c_str());
 656                                     pindexFork = pindex->pprev;
 657                                 }
 658                                 // check level 6: check whether spent txouts were spent by a valid transaction that consume them
 659                                 if (nCheckLevel>5)
 660                                 {
 661                                     CTransaction txSpend;
 662                                     if (!txSpend.ReadFromDisk(txpos))
 663                                     {
 664                                         printf("LoadBlockIndex(): *** cannot read spending transaction of %s:%i from disk\n", hashTx.ToString().c_str(), nOutput);
 665                                         pindexFork = pindex->pprev;
 666                                     }
 667                                     else if (!txSpend.CheckTransaction())
 668                                     {
 669                                         printf("LoadBlockIndex(): *** spending transaction of %s:%i is invalid\n", hashTx.ToString().c_str(), nOutput);
 670                                         pindexFork = pindex->pprev;
 671                                     }
 672                                     else
 673                                     {
 674                                         bool fFound = false;
 675                                         BOOST_FOREACH(const CTxIn &txin, txSpend.vin)
 676                                             if (txin.prevout.hash == hashTx && txin.prevout.n == nOutput)
 677                                                 fFound = true;
 678                                         if (!fFound)
 679                                         {
 680                                             printf("LoadBlockIndex(): *** spending transaction of %s:%i does not spend it\n", hashTx.ToString().c_str(), nOutput);
 681                                             pindexFork = pindex->pprev;
 682                                         }
 683                                     }
 684                                 }
 685                             }
 686                             nOutput++;
 687                         }
 688                     }
 689                 }
 690                 // check level 5: check whether all prevouts are marked spent
 691                 if (nCheckLevel>4)
 692                 {
 693                      BOOST_FOREACH(const CTxIn &txin, tx.vin)
 694                      {
 695                           CTxIndex txindex;
 696                           if (ReadTxIndex(txin.prevout.hash, txindex))
 697                               if (txindex.vSpent.size()-1 < txin.prevout.n || txindex.vSpent[txin.prevout.n].IsNull())
 698                               {
 699                                   printf("LoadBlockIndex(): *** found unspent prevout %s:%i in %s\n", txin.prevout.hash.ToString().c_str(), txin.prevout.n, hashTx.ToString().c_str());
 700                                   pindexFork = pindex->pprev;
 701                               }
 702                      }
 703                 }
 704             }
 705         }
 706     }
 707     if (pindexFork)
 708     {
 709         // Reorg back to the fork
 710         printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);
 711         CBlock block;
 712         if (!block.ReadFromDisk(pindexFork))
 713             return error("LoadBlockIndex() : block.ReadFromDisk failed");
 714         CTxDB txdb;
 715         block.SetBestChain(txdb, pindexFork);
 716     }
 717
 718     return true;
 719 }
 720
 721
 722
 723
 724
 725 //
 726 // CAddrDB
 727 //
 728
 729 bool CAddrDB::WriteAddrman(const CAddrMan& addrman)
 730 {
 731     return Write(string("addrman"), addrman);
 732 }
 733
 734 bool CAddrDB::LoadAddresses()
 735 {
 736     if (Read(string("addrman"), addrman))
 737     {
 738         printf("Loaded %i addresses\n", addrman.size());
 739         return true;
 740     }
 741
 742     // Read pre-0.6 addr records
 743
 744     vector<CAddress> vAddr;
 745     vector<vector<unsigned char> > vDelete;
 746
 747     // Get cursor
 748     Dbc* pcursor = GetCursor();
 749     if (!pcursor)
 750         return false;
 751
 752     loop
 753     {
 754         // Read next record
 755         CDataStream ssKey;
 756         CDataStream ssValue;
 757         int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 758         if (ret == DB_NOTFOUND)
 759             break;
 760         else if (ret != 0)
 761             return false;
 762
 763         // Unserialize
 764         string strType;
 765         ssKey >> strType;
 766         if (strType == "addr")
 767         {
 768             CAddress addr;
 769             ssValue >> addr;
 770             vAddr.push_back(addr);
 771         }
 772     }
 773     pcursor->close();
 774
 775     addrman.Add(vAddr, CNetAddr("0.0.0.0"));
 776     printf("Loaded %i addresses\n", addrman.size());
 777
 778     // Note: old records left; we ran into hangs-on-startup
 779     // bugs for some users who (we think) were running after
 780     // an unclean shutdown.
 781
 782     return true;
 783 }
 784
 785 bool LoadAddresses()
 786 {
 787     return CAddrDB("cr+").LoadAddresses();
 788 }
 789
 790
 791
 792
 793 //
 794 // CWalletDB
 795 //
 796
 797 bool CWalletDB::WriteName(const string& strAddress, const string& strName)
 798 {
 799     nWalletDBUpdated++;
 800     return Write(make_pair(string("name"), strAddress), strName);
 801 }
 802
 803 bool CWalletDB::EraseName(const string& strAddress)
 804 {
 805     // This should only be used for sending addresses, never for receiving addresses,
 806     // receiving addresses must always have an address book entry if they're not change return.
 807     nWalletDBUpdated++;
 808     return Erase(make_pair(string("name"), strAddress));
 809 }
 810
 811 bool CWalletDB::ReadAccount(const string& strAccount, CAccount& account)
 812 {
 813     account.SetNull();
 814     return Read(make_pair(string("acc"), strAccount), account);
 815 }
 816
 817 bool CWalletDB::WriteAccount(const string& strAccount, const CAccount& account)
 818 {
 819     return Write(make_pair(string("acc"), strAccount), account);
 820 }
 821
 822 bool CWalletDB::WriteAccountingEntry(const CAccountingEntry& acentry)
 823 {
 824     return Write(boost::make_tuple(string("acentry"), acentry.strAccount, ++nAccountingEntryNumber), acentry);
 825 }
 826
 827 int64 CWalletDB::GetAccountCreditDebit(const string& strAccount)
 828 {
 829     list<CAccountingEntry> entries;
 830     ListAccountCreditDebit(strAccount, entries);
 831
 832     int64 nCreditDebit = 0;
 833     BOOST_FOREACH (const CAccountingEntry& entry, entries)
 834         nCreditDebit += entry.nCreditDebit;
 835
 836     return nCreditDebit;
 837 }
 838
 839 void CWalletDB::ListAccountCreditDebit(const string& strAccount, list<CAccountingEntry>& entries)
 840 {
 841     bool fAllAccounts = (strAccount == "*");
 842
 843     Dbc* pcursor = GetCursor();
 844     if (!pcursor)
 845         throw runtime_error("CWalletDB::ListAccountCreditDebit() : cannot create DB cursor");
 846     unsigned int fFlags = DB_SET_RANGE;
 847     loop
 848     {
 849         // Read next record
 850         CDataStream ssKey;
 851         if (fFlags == DB_SET_RANGE)
 852             ssKey << boost::make_tuple(string("acentry"), (fAllAccounts? string("") : strAccount), uint64(0));
 853         CDataStream ssValue;
 854         int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
 855         fFlags = DB_NEXT;
 856         if (ret == DB_NOTFOUND)
 857             break;
 858         else if (ret != 0)
 859         {
 860             pcursor->close();
 861             throw runtime_error("CWalletDB::ListAccountCreditDebit() : error scanning DB");
 862         }
 863
 864         // Unserialize
 865         string strType;
 866         ssKey >> strType;
 867         if (strType != "acentry")
 868             break;
 869         CAccountingEntry acentry;
 870         ssKey >> acentry.strAccount;
 871         if (!fAllAccounts && acentry.strAccount != strAccount)
 872             break;
 873
 874         ssValue >> acentry;
 875         entries.push_back(acentry);
 876     }
 877
 878     pcursor->close();
 879 }
 880
 881
 882 int CWalletDB::LoadWallet(CWallet* pwallet)
 883 {
 884     pwallet->vchDefaultKey.clear();
 885     int nFileVersion = 0;
 886     vector<uint256> vWalletUpgrade;
 887     bool fIsEncrypted = false;
 888
 889     //// todo: shouldn't we catch exceptions and try to recover and continue?
 890     {
 891         LOCK(pwallet->cs_wallet);
 892         int nMinVersion = 0;
 893         if (Read((string)"minversion", nMinVersion))
 894         {
 895             if (nMinVersion > CLIENT_VERSION)
 896                 return DB_TOO_NEW;
 897             pwallet->LoadMinVersion(nMinVersion);
 898         }
 899
 900         // Get cursor
 901         Dbc* pcursor = GetCursor();
 902         if (!pcursor)
 903         {
 904             printf("Error getting wallet database cursor\n");
 905             return DB_CORRUPT;
 906         }
 907
 908         loop
 909         {
 910             // Read next record
 911             CDataStream ssKey;
 912             CDataStream ssValue;
 913             int ret = ReadAtCursor(pcursor, ssKey, ssValue);
 914             if (ret == DB_NOTFOUND)
 915                 break;
 916             else if (ret != 0)
 917             {
 918                 printf("Error reading next record from wallet database\n");
 919                 return DB_CORRUPT;
 920             }
 921
 922             // Unserialize
 923             // Taking advantage of the fact that pair serialization
 924             // is just the two items serialized one after the other
 925             string strType;
 926             ssKey >> strType;
 927             if (strType == "name")
 928             {
 929                 string strAddress;
 930                 ssKey >> strAddress;
 931                 ssValue >> pwallet->mapAddressBook[strAddress];
 932             }
 933             else if (strType == "tx")
 934             {
 935                 uint256 hash;
 936                 ssKey >> hash;
 937                 CWalletTx& wtx = pwallet->mapWallet[hash];
 938                 ssValue >> wtx;
 939                 wtx.BindWallet(pwallet);
 940
 941                 if (wtx.GetHash() != hash)
 942                     printf("Error in wallet.dat, hash mismatch\n");
 943
 944                 // Undo serialize changes in 31600
 945                 if (31404 <= wtx.fTimeReceivedIsTxTime && wtx.fTimeReceivedIsTxTime <= 31703)
 946                 {
 947                     if (!ssValue.empty())
 948                     {
 949                         char fTmp;
 950                         char fUnused;
 951                         ssValue >> fTmp >> fUnused >> wtx.strFromAccount;
 952                         printf("LoadWallet() upgrading tx ver=%d %d '%s' %s\n", wtx.fTimeReceivedIsTxTime, fTmp, wtx.strFromAccount.c_str(), hash.ToString().c_str());
 953                         wtx.fTimeReceivedIsTxTime = fTmp;
 954                     }
 955                     else
 956                     {
 957                         printf("LoadWallet() repairing tx ver=%d %s\n", wtx.fTimeReceivedIsTxTime, hash.ToString().c_str());
 958                         wtx.fTimeReceivedIsTxTime = 0;
 959                     }
 960                     vWalletUpgrade.push_back(hash);
 961                 }
 962
 963                 //// debug print
 964                 //printf("LoadWallet  %s\n", wtx.GetHash().ToString().c_str());
 965                 //printf(" %12I64d  %s  %s  %s\n",
 966                 //    wtx.vout[0].nValue,
 967                 //    DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
 968                 //    wtx.hashBlock.ToString().substr(0,20).c_str(),
 969                 //    wtx.mapValue["message"].c_str());
 970             }
 971             else if (strType == "acentry")
 972             {
 973                 string strAccount;
 974                 ssKey >> strAccount;
 975                 uint64 nNumber;
 976                 ssKey >> nNumber;
 977                 if (nNumber > nAccountingEntryNumber)
 978                     nAccountingEntryNumber = nNumber;
 979             }
 980             else if (strType == "key" || strType == "wkey")
 981             {
 982                 vector<unsigned char> vchPubKey;
 983                 ssKey >> vchPubKey;
 984                 CKey key;
 985                 if (strType == "key")
 986                 {
 987                     CPrivKey pkey;
 988                     ssValue >> pkey;
 989                     key.SetPubKey(vchPubKey);
 990                     key.SetPrivKey(pkey);
 991                     if (key.GetPubKey() != vchPubKey)
 992                     {
 993                         printf("Error reading wallet database: CPrivKey pubkey inconsistency\n");
 994                         return DB_CORRUPT;
 995                     }
 996                     if (!key.IsValid())
 997                     {
 998                         printf("Error reading wallet database: invalid CPrivKey\n");
 999                         return DB_CORRUPT;
1000                     }
1001                 }
1002                 else
1003                 {
1004                     CWalletKey wkey;
1005                     ssValue >> wkey;
1006                     key.SetPubKey(vchPubKey);
1007                     key.SetPrivKey(wkey.vchPrivKey);
1008                     if (key.GetPubKey() != vchPubKey)
1009                     {
1010                         printf("Error reading wallet database: CWalletKey pubkey inconsistency\n");
1011                         return DB_CORRUPT;
1012                     }
1013                     if (!key.IsValid())
1014                     {
1015                         printf("Error reading wallet database: invalid CWalletKey\n");
1016                         return DB_CORRUPT;
1017                     }
1018                 }
1019                 if (!pwallet->LoadKey(key))
1020                 {
1021                     printf("Error reading wallet database: LoadKey failed\n");
1022                     return DB_CORRUPT;
1023                 }
1024             }
1025             else if (strType == "mkey")
1026             {
1027                 unsigned int nID;
1028                 ssKey >> nID;
1029                 CMasterKey kMasterKey;
1030                 ssValue >> kMasterKey;
1031                 if(pwallet->mapMasterKeys.count(nID) != 0)
1032                 {
1033                     printf("Error reading wallet database: duplicate CMasterKey id %u\n", nID);
1034                     return DB_CORRUPT;
1035                 }
1036                 pwallet->mapMasterKeys[nID] = kMasterKey;
1037                 if (pwallet->nMasterKeyMaxID < nID)
1038                     pwallet->nMasterKeyMaxID = nID;
1039             }
1040             else if (strType == "ckey")
1041             {
1042                 vector<unsigned char> vchPubKey;
1043                 ssKey >> vchPubKey;
1044                 vector<unsigned char> vchPrivKey;
1045                 ssValue >> vchPrivKey;
1046                 if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
1047                 {
1048                     printf("Error reading wallet database: LoadCryptedKey failed\n");
1049                     return DB_CORRUPT;
1050                 }
1051                 fIsEncrypted = true;
1052             }
1053             else if (strType == "defaultkey")
1054             {
1055                 ssValue >> pwallet->vchDefaultKey;
1056             }
1057             else if (strType == "pool")
1058             {
1059                 int64 nIndex;
1060                 ssKey >> nIndex;
1061                 pwallet->setKeyPool.insert(nIndex);
1062             }
1063             else if (strType == "version")
1064             {
1065                 ssValue >> nFileVersion;
1066                 if (nFileVersion == 10300)
1067                     nFileVersion = 300;
1068             }
1069             else if (strType == "cscript")
1070             {
1071                 uint160 hash;
1072                 ssKey >> hash;
1073                 CScript script;
1074                 ssValue >> script;
1075                 if (!pwallet->LoadCScript(script))
1076                 {
1077                     printf("Error reading wallet database: LoadCScript failed\n");
1078                     return DB_CORRUPT;
1079                 }
1080             }
1081         }
1082         pcursor->close();
1083     }
1084
1085     BOOST_FOREACH(uint256 hash, vWalletUpgrade)
1086         WriteTx(hash, pwallet->mapWallet[hash]);
1087
1088     printf("nFileVersion = %d\n", nFileVersion);
1089
1090
1091     // Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
1092     if (fIsEncrypted && (nFileVersion == 40000 || nFileVersion == 50000))
1093         return DB_NEED_REWRITE;
1094
1095     if (nFileVersion < CLIENT_VERSION) // Update
1096         WriteVersion(CLIENT_VERSION);
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 /= 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 }