Skip to content
This repository
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 862 lines (747 sloc) 28.458 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "db.h"
#include "util.h"
#include "main.h"
#include <boost/version.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>

#ifndef WIN32
#include "sys/stat.h"
#endif

using namespace std;
using namespace boost;


unsigned int nWalletDBUpdated;



//
// CDB
//

CDBEnv bitdb;

void CDBEnv::EnvShutdown()
{
    if (!fDbEnvInit)
        return;

    fDbEnvInit = false;
    try
    {
        dbenv.close(0);
    }
    catch (const DbException& e)
    {
        printf("EnvShutdown exception: %s (%d)\n", e.what(), e.get_errno());
    }
    if (!fMockDb)
        DbEnv(0).remove(GetDataDir().string().c_str(), 0);
}

CDBEnv::CDBEnv() : dbenv(0)
{
}

CDBEnv::~CDBEnv()
{
    EnvShutdown();
}

void CDBEnv::Close()
{
    EnvShutdown();
}

bool CDBEnv::Open(boost::filesystem::path pathEnv_)
{
    if (fDbEnvInit)
        return true;

    if (fShutdown)
        return false;

    pathEnv = pathEnv_;
    filesystem::path pathDataDir = pathEnv;
    filesystem::path pathLogDir = pathDataDir / "database";
    filesystem::create_directory(pathLogDir);
    filesystem::path pathErrorFile = pathDataDir / "db.log";
    printf("dbenv.open LogDir=%s ErrorFile=%s\n", pathLogDir.string().c_str(), pathErrorFile.string().c_str());

    unsigned int nEnvFlags = 0;
    if (GetBoolArg("-privdb", true))
        nEnvFlags |= DB_PRIVATE;

    int nDbCache = GetArg("-dbcache", 25);
    dbenv.set_lg_dir(pathLogDir.string().c_str());
    dbenv.set_cachesize(nDbCache / 1024, (nDbCache % 1024)*1048576, 1);
    dbenv.set_lg_bsize(1048576);
    dbenv.set_lg_max(10485760);
    dbenv.set_lk_max_locks(10000);
    dbenv.set_lk_max_objects(10000);
    dbenv.set_errfile(fopen(pathErrorFile.string().c_str(), "a")); /// debug
    dbenv.set_flags(DB_AUTO_COMMIT, 1);
    dbenv.set_flags(DB_TXN_WRITE_NOSYNC, 1);
    dbenv.log_set_config(DB_LOG_AUTO_REMOVE, 1);
    int ret = dbenv.open(pathDataDir.string().c_str(),
                     DB_CREATE |
                     DB_INIT_LOCK |
                     DB_INIT_LOG |
                     DB_INIT_MPOOL |
                     DB_INIT_TXN |
                     DB_THREAD |
                     DB_RECOVER |
                     nEnvFlags,
                     S_IRUSR | S_IWUSR);
    if (ret > 0)
        return error("CDB() : error %d opening database environment", ret);

    fDbEnvInit = true;
    fMockDb = false;
    return true;
}

void CDBEnv::MakeMock()
{
    if (fDbEnvInit)
        throw runtime_error("CDBEnv::MakeMock(): already initialized");

    if (fShutdown)
        throw runtime_error("CDBEnv::MakeMock(): during shutdown");

    printf("CDBEnv::MakeMock()\n");

    dbenv.set_cachesize(1, 0, 1);
    dbenv.set_lg_bsize(10485760*4);
    dbenv.set_lg_max(10485760);
    dbenv.set_lk_max_locks(10000);
    dbenv.set_lk_max_objects(10000);
    dbenv.set_flags(DB_AUTO_COMMIT, 1);
    dbenv.log_set_config(DB_LOG_IN_MEMORY, 1);
    int ret = dbenv.open(NULL,
                     DB_CREATE |
                     DB_INIT_LOCK |
                     DB_INIT_LOG |
                     DB_INIT_MPOOL |
                     DB_INIT_TXN |
                     DB_THREAD |
                     DB_PRIVATE,
                     S_IRUSR | S_IWUSR);
    if (ret > 0)
        throw runtime_error(strprintf("CDBEnv::MakeMock(): error %d opening database environment", ret));

    fDbEnvInit = true;
    fMockDb = true;
}

void CDBEnv::CheckpointLSN(std::string strFile)
{
    dbenv.txn_checkpoint(0, 0, 0);
    if (fMockDb)
        return;
    dbenv.lsn_reset(strFile.c_str(), 0);
}


CDB::CDB(const char *pszFile, const char* pszMode) :
    pdb(NULL), activeTxn(NULL)
{
    int ret;
    if (pszFile == NULL)
        return;

    fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
    bool fCreate = strchr(pszMode, 'c');
    unsigned int nFlags = DB_THREAD;
    if (fCreate)
        nFlags |= DB_CREATE;

    {
        LOCK(bitdb.cs_db);
        if (!bitdb.Open(GetDataDir()))
            throw runtime_error("env open failed");

        strFile = pszFile;
        ++bitdb.mapFileUseCount[strFile];
        pdb = bitdb.mapDb[strFile];
        if (pdb == NULL)
        {
            pdb = new Db(&bitdb.dbenv, 0);

            bool fMockDb = bitdb.IsMock();
            if (fMockDb)
            {
                DbMpoolFile*mpf = pdb->get_mpf();
                ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
                if (ret != 0)
                    throw runtime_error(strprintf("CDB() : failed to configure for no temp file backing for database %s", pszFile));
            }

            ret = pdb->open(NULL, // Txn pointer
                            fMockDb ? NULL : pszFile, // Filename
                            "main", // Logical db name
                            DB_BTREE, // Database type
                            nFlags, // Flags
                            0);

            if (ret > 0)
            {
                delete pdb;
                pdb = NULL;
                --bitdb.mapFileUseCount[strFile];
                strFile = "";
                throw runtime_error(strprintf("CDB() : can't open database file %s, error %d", pszFile, ret));
            }

            if (fCreate && !Exists(string("version")))
            {
                bool fTmp = fReadOnly;
                fReadOnly = false;
                WriteVersion(CLIENT_VERSION);
                fReadOnly = fTmp;
            }

            bitdb.mapDb[strFile] = pdb;
        }
    }
}

static bool IsChainFile(std::string strFile)
{
    if (strFile == "blkindex.dat")
        return true;

    return false;
}

void CDB::Close()
{
    if (!pdb)
        return;
    if (activeTxn)
        activeTxn->abort();
    activeTxn = NULL;
    pdb = NULL;

    // Flush database activity from memory pool to disk log
    unsigned int nMinutes = 0;
    if (fReadOnly)
        nMinutes = 1;
    if (IsChainFile(strFile))
        nMinutes = 2;
    if (IsChainFile(strFile) && IsInitialBlockDownload())
        nMinutes = 5;

    bitdb.dbenv.txn_checkpoint(nMinutes ? GetArg("-dblogsize", 100)*1024 : 0, nMinutes, 0);

    {
        LOCK(bitdb.cs_db);
        --bitdb.mapFileUseCount[strFile];
    }
}

void CDBEnv::CloseDb(const string& strFile)
{
    {
        LOCK(cs_db);
        if (mapDb[strFile] != NULL)
        {
            // Close the database handle
            Db* pdb = mapDb[strFile];
            pdb->close(0);
            delete pdb;
            mapDb[strFile] = NULL;
        }
    }
}

bool CDB::Rewrite(const string& strFile, const char* pszSkip)
{
    while (!fShutdown)
    {
        {
            LOCK(bitdb.cs_db);
            if (!bitdb.mapFileUseCount.count(strFile) || bitdb.mapFileUseCount[strFile] == 0)
            {
                // Flush log data to the dat file
                bitdb.CloseDb(strFile);
                bitdb.CheckpointLSN(strFile);
                bitdb.mapFileUseCount.erase(strFile);

                bool fSuccess = true;
                printf("Rewriting %s...\n", strFile.c_str());
                string strFileRes = strFile + ".rewrite";
                { // surround usage of db with extra {}
                    CDB db(strFile.c_str(), "r");
                    Db* pdbCopy = new Db(&bitdb.dbenv, 0);

                    int ret = pdbCopy->open(NULL, // Txn pointer
                                            strFileRes.c_str(), // Filename
                                            "main", // Logical db name
                                            DB_BTREE, // Database type
                                            DB_CREATE, // Flags
                                            0);
                    if (ret > 0)
                    {
                        printf("Cannot create database file %s\n", strFileRes.c_str());
                        fSuccess = false;
                    }

                    Dbc* pcursor = db.GetCursor();
                    if (pcursor)
                        while (fSuccess)
                        {
                            CDataStream ssKey(SER_DISK, CLIENT_VERSION);
                            CDataStream ssValue(SER_DISK, CLIENT_VERSION);
                            int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
                            if (ret == DB_NOTFOUND)
                            {
                                pcursor->close();
                                break;
                            }
                            else if (ret != 0)
                            {
                                pcursor->close();
                                fSuccess = false;
                                break;
                            }
                            if (pszSkip &&
                                strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
                                continue;
                            if (strncmp(&ssKey[0], "\x07version", 8) == 0)
                            {
                                // Update version:
                                ssValue.clear();
                                ssValue << CLIENT_VERSION;
                            }
                            Dbt datKey(&ssKey[0], ssKey.size());
                            Dbt datValue(&ssValue[0], ssValue.size());
                            int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
                            if (ret2 > 0)
                                fSuccess = false;
                        }
                    if (fSuccess)
                    {
                        db.Close();
                        bitdb.CloseDb(strFile);
                        if (pdbCopy->close(0))
                            fSuccess = false;
                        delete pdbCopy;
                    }
                }
                if (fSuccess)
                {
                    Db dbA(&bitdb.dbenv, 0);
                    if (dbA.remove(strFile.c_str(), NULL, 0))
                        fSuccess = false;
                    Db dbB(&bitdb.dbenv, 0);
                    if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
                        fSuccess = false;
                }
                if (!fSuccess)
                    printf("Rewriting of %s FAILED!\n", strFileRes.c_str());
                return fSuccess;
            }
        }
        Sleep(100);
    }
    return false;
}


void CDBEnv::Flush(bool fShutdown)
{
    int64 nStart = GetTimeMillis();
    // Flush log data to the actual data file
    // on all files that are not in use
    printf("Flush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
    if (!fDbEnvInit)
        return;
    {
        LOCK(cs_db);
        map<string, int>::iterator mi = mapFileUseCount.begin();
        while (mi != mapFileUseCount.end())
        {
            string strFile = (*mi).first;
            int nRefCount = (*mi).second;
            printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
            if (nRefCount == 0)
            {
                // Move log data to the dat file
                CloseDb(strFile);
                printf("%s checkpoint\n", strFile.c_str());
                dbenv.txn_checkpoint(0, 0, 0);
                if (!IsChainFile(strFile) || fDetachDB) {
                    printf("%s detach\n", strFile.c_str());
                    if (!fMockDb)
                        dbenv.lsn_reset(strFile.c_str(), 0);
                }
                printf("%s closed\n", strFile.c_str());
                mapFileUseCount.erase(mi++);
            }
            else
                mi++;
        }
        printf("DBFlush(%s)%s ended %15"PRI64d"ms\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started", GetTimeMillis() - nStart);
        if (fShutdown)
        {
            char** listp;
            if (mapFileUseCount.empty())
            {
                dbenv.log_archive(&listp, DB_ARCH_REMOVE);
                Close();
            }
        }
    }
}






//
// CTxDB
//

bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
{
    assert(!fClient);
    txindex.SetNull();
    return Read(make_pair(string("tx"), hash), txindex);
}

bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)
{
    assert(!fClient);
    return Write(make_pair(string("tx"), hash), txindex);
}

bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)
{
    assert(!fClient);

    // Add to tx index
    uint256 hash = tx.GetHash();
    CTxIndex txindex(pos, tx.vout.size());
    return Write(make_pair(string("tx"), hash), txindex);
}

bool CTxDB::EraseTxIndex(const CTransaction& tx)
{
    assert(!fClient);
    uint256 hash = tx.GetHash();

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

bool CTxDB::ContainsTx(uint256 hash)
{
    assert(!fClient);
    return Exists(make_pair(string("tx"), hash));
}

bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)
{
    assert(!fClient);
    tx.SetNull();
    if (!ReadTxIndex(hash, txindex))
        return false;
    return (tx.ReadFromDisk(txindex.pos));
}

bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)
{
    CTxIndex txindex;
    return ReadDiskTx(hash, tx, txindex);
}

bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)
{
    return ReadDiskTx(outpoint.hash, tx, txindex);
}

bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)
{
    CTxIndex txindex;
    return ReadDiskTx(outpoint.hash, tx, txindex);
}

bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
{
    return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
}

bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
{
    return Read(string("hashBestChain"), hashBestChain);
}

bool CTxDB::WriteHashBestChain(uint256 hashBestChain)
{
    return Write(string("hashBestChain"), hashBestChain);
}

bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
{
    return Read(string("bnBestInvalidWork"), bnBestInvalidWork);
}

bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)
{
    return Write(string("bnBestInvalidWork"), bnBestInvalidWork);
}

CBlockIndex static * InsertBlockIndex(uint256 hash)
{
    if (hash == 0)
        return NULL;

    // Return existing
    map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
    if (mi != mapBlockIndex.end())
        return (*mi).second;

    // Create new
    CBlockIndex* pindexNew = new CBlockIndex();
    if (!pindexNew)
        throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");
    mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
    pindexNew->phashBlock = &((*mi).first);

    return pindexNew;
}

bool CTxDB::LoadBlockIndex()
{
    if (!LoadBlockIndexGuts())
        return false;

    if (fRequestShutdown)
        return true;

    // Calculate bnChainWork
    vector<pair<int, CBlockIndex*> > vSortedByHeight;
    vSortedByHeight.reserve(mapBlockIndex.size());
    BOOST_FOREACH(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
    {
        CBlockIndex* pindex = item.second;
        vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));
    }
    sort(vSortedByHeight.begin(), vSortedByHeight.end());
    BOOST_FOREACH(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
    {
        CBlockIndex* pindex = item.second;
        pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
    }

    // Load hashBestChain pointer to end of best chain
    if (!ReadHashBestChain(hashBestChain))
    {
        if (pindexGenesisBlock == NULL)
            return true;
        return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");
    }
    if (!mapBlockIndex.count(hashBestChain))
        return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");
    pindexBest = mapBlockIndex[hashBestChain];
    nBestHeight = pindexBest->nHeight;
    bnBestChainWork = pindexBest->bnChainWork;
    printf("LoadBlockIndex(): hashBestChain=%s height=%d date=%s\n",
      hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
      DateTimeStrFormat("%x %H:%M:%S", pindexBest->GetBlockTime()).c_str());

    // Load bnBestInvalidWork, OK if it doesn't exist
    ReadBestInvalidWork(bnBestInvalidWork);

    // Verify blocks in the best chain
    int nCheckLevel = GetArg("-checklevel", 1);
    int nCheckDepth = GetArg( "-checkblocks", 2500);
    if (nCheckDepth == 0)
        nCheckDepth = 1000000000; // suffices until the year 19000
    if (nCheckDepth > nBestHeight)
        nCheckDepth = nBestHeight;
    printf("Verifying last %i blocks at level %i\n", nCheckDepth, nCheckLevel);
    CBlockIndex* pindexFork = NULL;
    map<pair<unsigned int, unsigned int>, CBlockIndex*> mapBlockPos;
    for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
    {
        if (fRequestShutdown || pindex->nHeight < nBestHeight-nCheckDepth)
            break;
        CBlock block;
        if (!block.ReadFromDisk(pindex))
            return error("LoadBlockIndex() : block.ReadFromDisk failed");
        // check level 1: verify block validity
        if (nCheckLevel>0 && !block.CheckBlock())
        {
            printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
            pindexFork = pindex->pprev;
        }
        // check level 2: verify transaction index validity
        if (nCheckLevel>1)
        {
            pair<unsigned int, unsigned int> pos = make_pair(pindex->nFile, pindex->nBlockPos);
            mapBlockPos[pos] = pindex;
            BOOST_FOREACH(const CTransaction &tx, block.vtx)
            {
                uint256 hashTx = tx.GetHash();
                CTxIndex txindex;
                if (ReadTxIndex(hashTx, txindex))
                {
                    // check level 3: checker transaction hashes
                    if (nCheckLevel>2 || pindex->nFile != txindex.pos.nFile || pindex->nBlockPos != txindex.pos.nBlockPos)
                    {
                        // either an error or a duplicate transaction
                        CTransaction txFound;
                        if (!txFound.ReadFromDisk(txindex.pos))
                        {
                            printf("LoadBlockIndex() : *** cannot read mislocated transaction %s\n", hashTx.ToString().c_str());
                            pindexFork = pindex->pprev;
                        }
                        else
                            if (txFound.GetHash() != hashTx) // not a duplicate tx
                            {
                                printf("LoadBlockIndex(): *** invalid tx position for %s\n", hashTx.ToString().c_str());
                                pindexFork = pindex->pprev;
                            }
                    }
                    // check level 4: check whether spent txouts were spent within the main chain
                    unsigned int nOutput = 0;
                    if (nCheckLevel>3)
                    {
                        BOOST_FOREACH(const CDiskTxPos &txpos, txindex.vSpent)
                        {
                            if (!txpos.IsNull())
                            {
                                pair<unsigned int, unsigned int> posFind = make_pair(txpos.nFile, txpos.nBlockPos);
                                if (!mapBlockPos.count(posFind))
                                {
                                    printf("LoadBlockIndex(): *** found bad spend at %d, hashBlock=%s, hashTx=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str(), hashTx.ToString().c_str());
                                    pindexFork = pindex->pprev;
                                }
                                // check level 6: check whether spent txouts were spent by a valid transaction that consume them
                                if (nCheckLevel>5)
                                {
                                    CTransaction txSpend;
                                    if (!txSpend.ReadFromDisk(txpos))
                                    {
                                        printf("LoadBlockIndex(): *** cannot read spending transaction of %s:%i from disk\n", hashTx.ToString().c_str(), nOutput);
                                        pindexFork = pindex->pprev;
                                    }
                                    else if (!txSpend.CheckTransaction())
                                    {
                                        printf("LoadBlockIndex(): *** spending transaction of %s:%i is invalid\n", hashTx.ToString().c_str(), nOutput);
                                        pindexFork = pindex->pprev;
                                    }
                                    else
                                    {
                                        bool fFound = false;
                                        BOOST_FOREACH(const CTxIn &txin, txSpend.vin)
                                            if (txin.prevout.hash == hashTx && txin.prevout.n == nOutput)
                                                fFound = true;
                                        if (!fFound)
                                        {
                                            printf("LoadBlockIndex(): *** spending transaction of %s:%i does not spend it\n", hashTx.ToString().c_str(), nOutput);
                                            pindexFork = pindex->pprev;
                                        }
                                    }
                                }
                            }
                            nOutput++;
                        }
                    }
                }
                // check level 5: check whether all prevouts are marked spent
                if (nCheckLevel>4)
                {
                     BOOST_FOREACH(const CTxIn &txin, tx.vin)
                     {
                          CTxIndex txindex;
                          if (ReadTxIndex(txin.prevout.hash, txindex))
                              if (txindex.vSpent.size()-1 < txin.prevout.n || txindex.vSpent[txin.prevout.n].IsNull())
                              {
                                  printf("LoadBlockIndex(): *** found unspent prevout %s:%i in %s\n", txin.prevout.hash.ToString().c_str(), txin.prevout.n, hashTx.ToString().c_str());
                                  pindexFork = pindex->pprev;
                              }
                     }
                }
            }
        }
    }
    if (pindexFork && !fRequestShutdown)
    {
        // Reorg back to the fork
        printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);
        CBlock block;
        if (!block.ReadFromDisk(pindexFork))
            return error("LoadBlockIndex() : block.ReadFromDisk failed");
        CTxDB txdb;
        block.SetBestChain(txdb, pindexFork);
    }

    return true;
}



bool CTxDB::LoadBlockIndexGuts()
{
    // Get database cursor
    Dbc* pcursor = GetCursor();
    if (!pcursor)
        return false;

    // Load mapBlockIndex
    unsigned int fFlags = DB_SET_RANGE;
    loop
    {
        // Read next record
        CDataStream ssKey(SER_DISK, CLIENT_VERSION);
        if (fFlags == DB_SET_RANGE)
            ssKey << make_pair(string("blockindex"), uint256(0));
        CDataStream ssValue(SER_DISK, CLIENT_VERSION);
        int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
        fFlags = DB_NEXT;
        if (ret == DB_NOTFOUND)
            break;
        else if (ret != 0)
            return false;

        // Unserialize

        try {
        string strType;
        ssKey >> strType;
        if (strType == "blockindex" && !fRequestShutdown)
        {
            CDiskBlockIndex diskindex;
            ssValue >> diskindex;

            // Construct block index object
            CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
            pindexNew->pprev = InsertBlockIndex(diskindex.hashPrev);
            pindexNew->pnext = InsertBlockIndex(diskindex.hashNext);
            pindexNew->nFile = diskindex.nFile;
            pindexNew->nBlockPos = diskindex.nBlockPos;
            pindexNew->nHeight = diskindex.nHeight;
            pindexNew->nVersion = diskindex.nVersion;
            pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
            pindexNew->nTime = diskindex.nTime;
            pindexNew->nBits = diskindex.nBits;
            pindexNew->nNonce = diskindex.nNonce;

            // Watch for genesis block
            if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
                pindexGenesisBlock = pindexNew;

            if (!pindexNew->CheckIndex())
                return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);
        }
        else
        {
            break; // if shutdown requested or finished loading block index
        }
        } // try
        catch (std::exception &e) {
            return error("%s() : deserialize error", __PRETTY_FUNCTION__);
        }
    }
    pcursor->close();

    return true;
}





//
// CAddrDB
//


CAddrDB::CAddrDB()
{
    pathAddr = GetDataDir() / "peers.dat";
}

bool CAddrDB::Write(const CAddrMan& addr)
{
    // Generate random temporary filename
    unsigned short randv = 0;
    RAND_bytes((unsigned char *)&randv, sizeof(randv));
    std::string tmpfn = strprintf("peers.dat.%04x", randv);

    // serialize addresses, checksum data up to that point, then append csum
    CDataStream ssPeers(SER_DISK, CLIENT_VERSION);
    ssPeers << FLATDATA(pchMessageStart);
    ssPeers << addr;
    uint256 hash = Hash(ssPeers.begin(), ssPeers.end());
    ssPeers << hash;

    // open temp output file, and associate with CAutoFile
    boost::filesystem::path pathTmp = GetDataDir() / tmpfn;
    FILE *file = fopen(pathTmp.string().c_str(), "wb");
    CAutoFile fileout = CAutoFile(file, SER_DISK, CLIENT_VERSION);
    if (!fileout)
        return error("CAddrman::Write() : open failed");

    // Write and commit header, data
    try {
        fileout << ssPeers;
    }
    catch (std::exception &e) {
        return error("CAddrman::Write() : I/O error");
    }
    FileCommit(fileout);
    fileout.fclose();

    // replace existing peers.dat, if any, with new peers.dat.XXXX
    if (!RenameOver(pathTmp, pathAddr))
        return error("CAddrman::Write() : Rename-into-place failed");

    return true;
}

bool CAddrDB::Read(CAddrMan& addr)
{
    // open input file, and associate with CAutoFile
    FILE *file = fopen(pathAddr.string().c_str(), "rb");
    CAutoFile filein = CAutoFile(file, SER_DISK, CLIENT_VERSION);
    if (!filein)
        return error("CAddrman::Read() : open failed");

    // use file size to size memory buffer
    int fileSize = GetFilesize(filein);
    int dataSize = fileSize - sizeof(uint256);
    vector<unsigned char> vchData;
    vchData.resize(dataSize);
    uint256 hashIn;

    // read data and checksum from file
    try {
        filein.read((char *)&vchData[0], dataSize);
        filein >> hashIn;
    }
    catch (std::exception &e) {
        return error("CAddrman::Read() 2 : I/O error or stream data corrupted");
    }
    filein.fclose();

    CDataStream ssPeers(vchData, SER_DISK, CLIENT_VERSION);

    // verify stored checksum matches input data
    uint256 hashTmp = Hash(ssPeers.begin(), ssPeers.end());
    if (hashIn != hashTmp)
        return error("CAddrman::Read() : checksum mismatch; data corrupted");

    // de-serialize address data
    unsigned char pchMsgTmp[4];
    try {
        ssPeers >> FLATDATA(pchMsgTmp);
        ssPeers >> addr;
    }
    catch (std::exception &e) {
        return error("CAddrman::Read() : I/O error or stream data corrupted");
    }

    // finally, verify the network matches ours
    if (memcmp(pchMsgTmp, pchMessageStart, sizeof(pchMsgTmp)))
        return error("CAddrman::Read() : invalid network magic number");

    return true;
}

Something went wrong with that request. Please try again.