sidecoin/src/db.cpp at master · superstacked/sidecoin · GitHub

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// 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 "addrman.h"

#include "hash.h"

#include "protocol.h"

#include "util.h"

#include <stdint.h>

#ifndef WIN32

#include <sys/stat.h>

#endif

#include <boost/filesystem.hpp>

#include <boost/version.hpp>

#include <openssl/rand.h>

using namespace std;

using namespace boost;

unsigned int nWalletDBUpdated;

// CDB

CDBEnv bitdb;

void CDBEnv::EnvShutdown()

{

if (!fDbEnvInit)

return;

fDbEnvInit = false;

int ret = dbenv.close(0);

if (ret != 0)

LogPrintf("EnvShutdown exception: %s (%d)\n", DbEnv::strerror(ret), ret);

if (!fMockDb)

DbEnv(0).remove(path.string().c_str(), 0);

}

CDBEnv::CDBEnv() : dbenv(DB_CXX_NO_EXCEPTIONS)

{

fDbEnvInit = false;

fMockDb = false;

}

CDBEnv::~CDBEnv()

{

EnvShutdown();

}

void CDBEnv::Close()

{

EnvShutdown();

}

bool CDBEnv::Open(const boost::filesystem::path& pathIn)

{

if (fDbEnvInit)

return true;

boost::this_thread::interruption_point();

path = pathIn;

filesystem::path pathLogDir = path / "database";

filesystem::create_directory(pathLogDir);

filesystem::path pathErrorFile = path / "db.log";

LogPrintf("dbenv.open LogDir=%s ErrorFile=%s\n", pathLogDir.string(), pathErrorFile.string());

unsigned int nEnvFlags = 0;

if (GetBoolArg("-privdb", true))

nEnvFlags |= DB_PRIVATE;

dbenv.set_lg_dir(pathLogDir.string().c_str());

dbenv.set_cachesize(0, 0x100000, 1); // 1 MiB should be enough for just the wallet

dbenv.set_lg_bsize(0x10000);

dbenv.set_lg_max(1048576);

dbenv.set_lk_max_locks(40000);

dbenv.set_lk_max_objects(40000);

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(path.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 %s (%d) opening database environment", DbEnv::strerror(ret), ret);

fDbEnvInit = true;

fMockDb = false;

return true;

}

void CDBEnv::MakeMock()

{

if (fDbEnvInit)

throw runtime_error("CDBEnv::MakeMock(): already initialized");

boost::this_thread::interruption_point();

LogPrint("db", "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;

}

CDBEnv::VerifyResult CDBEnv::Verify(std::string strFile, bool (*recoverFunc)(CDBEnv& dbenv, std::string strFile))

{

LOCK(cs_db);

assert(mapFileUseCount.count(strFile) == 0);

Db db(&dbenv, 0);

int result = db.verify(strFile.c_str(), NULL, NULL, 0);

if (result == 0)

return VERIFY_OK;

else if (recoverFunc == NULL)

return RECOVER_FAIL;

// Try to recover:

bool fRecovered = (*recoverFunc)(*this, strFile);

return (fRecovered ? RECOVER_OK : RECOVER_FAIL);

}

bool CDBEnv::Salvage(std::string strFile, bool fAggressive,

std::vector<CDBEnv::KeyValPair >& vResult)

{

LOCK(cs_db);

assert(mapFileUseCount.count(strFile) == 0);

u_int32_t flags = DB_SALVAGE;

if (fAggressive) flags |= DB_AGGRESSIVE;

stringstream strDump;

Db db(&dbenv, 0);

int result = db.verify(strFile.c_str(), NULL, &strDump, flags);

if (result == DB_VERIFY_BAD)

{

LogPrintf("Error: Salvage found errors, all data may not be recoverable.\n");

if (!fAggressive)

{

LogPrintf("Error: Rerun with aggressive mode to ignore errors and continue.\n");

return false;

}

if (result != 0 && result != DB_VERIFY_BAD)

{

LogPrintf("ERROR: db salvage failed: %d\n",result);

return false;

}

// Format of bdb dump is ascii lines:

// header lines...

// HEADER=END

// hexadecimal key

// hexadecimal value

// ... repeated

// DATA=END

string strLine;

while (!strDump.eof() && strLine != "HEADER=END")

getline(strDump, strLine); // Skip past header

std::string keyHex, valueHex;

while (!strDump.eof() && keyHex != "DATA=END")

{

getline(strDump, keyHex);

if (keyHex != "DATA_END")

{

getline(strDump, valueHex);

vResult.push_back(make_pair(ParseHex(keyHex),ParseHex(valueHex)));

}

return (result == 0);

}

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

fMockDb ? pszFile : "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;

}

void CDB::Flush()

{

if (activeTxn)

return;

// Flush database activity from memory pool to disk log

unsigned int nMinutes = 0;

if (fReadOnly)

nMinutes = 1;

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

}

void CDB::Close()

{

if (!pdb)

return;

if (activeTxn)

activeTxn->abort();

activeTxn = NULL;

pdb = NULL;

Flush();

{

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 CDBEnv::RemoveDb(const string& strFile)

{

this->CloseDb(strFile);

LOCK(cs_db);

int rc = dbenv.dbremove(NULL, strFile.c_str(), NULL, DB_AUTO_COMMIT);

return (rc == 0);

}

bool CDB::Rewrite(const string& strFile, const char* pszSkip)

{

while (true)

{

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;

LogPrintf("Rewriting %s...\n", strFile);

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)

{

LogPrintf("Cannot create database file %s\n", strFileRes);

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)

LogPrintf("Rewriting of %s FAILED!\n", strFileRes);

return fSuccess;

}

MilliSleep(100);

}

return false;

}

void CDBEnv::Flush(bool fShutdown)

{

int64_t nStart = GetTimeMillis();

// Flush log data to the actual data file

// on all files that are not in use

LogPrint("db", "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;

LogPrint("db", "%s refcount=%d\n", strFile, nRefCount);

if (nRefCount == 0)

{

// Move log data to the dat file

CloseDb(strFile);

LogPrint("db", "%s checkpoint\n", strFile);

dbenv.txn_checkpoint(0, 0, 0);

LogPrint("db", "%s detach\n", strFile);

if (!fMockDb)

dbenv.lsn_reset(strFile.c_str(), 0);

LogPrint("db", "%s closed\n", strFile);

mapFileUseCount.erase(mi++);

}

else

mi++;

}

LogPrint("db", "DBFlush(%s)%s ended %15dms\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();

if (!fMockDb)

boost::filesystem::remove_all(path / "database");

}

sidecoin/src/db.cpp at master · superstacked/sidecoin · GitHub

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