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kevacoin/src/wallet/db.cpp

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "db.h"
#include "addrman.h"
#include "fs.h"
#include "hash.h"
#include "protocol.h"
#include "util.h"
#include "utilstrencodings.h"
#include <stdint.h>
#ifndef WIN32
#include <sys/stat.h>
#endif
#include <boost/thread.hpp>
//
// CDB
//
CDBEnv bitdb;
void CDBEnv::EnvShutdown()
{
if (!fDbEnvInit)
return;
fDbEnvInit = false;
int ret = dbenv->close(0);
if (ret != 0)
LogPrintf("CDBEnv::EnvShutdown: Error %d shutting down database environment: %s\n", ret, DbEnv::strerror(ret));
if (!fMockDb)
DbEnv((u_int32_t)0).remove(strPath.c_str(), 0);
}
void CDBEnv::Reset()
{
delete dbenv;
dbenv = new DbEnv(DB_CXX_NO_EXCEPTIONS);
fDbEnvInit = false;
fMockDb = false;
}
CDBEnv::CDBEnv() : dbenv(nullptr)
{
Reset();
}
CDBEnv::~CDBEnv()
{
EnvShutdown();
delete dbenv;
dbenv = nullptr;
}
void CDBEnv::Close()
{
EnvShutdown();
}
bool CDBEnv::Open(const fs::path& pathIn)
{
if (fDbEnvInit)
return true;
boost::this_thread::interruption_point();
strPath = pathIn.string();
fs::path pathLogDir = pathIn / "database";
TryCreateDirectories(pathLogDir);
fs::path pathErrorFile = pathIn / "db.log";
LogPrintf("CDBEnv::Open: LogDir=%s ErrorFile=%s\n", pathLogDir.string(), pathErrorFile.string());
unsigned int nEnvFlags = 0;
if (gArgs.GetBoolArg("-privdb", DEFAULT_WALLET_PRIVDB))
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(fsbridge::fopen(pathErrorFile, "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(strPath.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) {
dbenv->close(0);
return error("CDBEnv::Open: Error %d opening database environment: %s\n", ret, DbEnv::strerror(ret));
}
fDbEnvInit = true;
fMockDb = false;
return true;
}
void CDBEnv::MakeMock()
{
if (fDbEnvInit)
throw std::runtime_error("CDBEnv::MakeMock: Already initialized");
boost::this_thread::interruption_point();
LogPrint(BCLog::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(nullptr,
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 std::runtime_error(strprintf("CDBEnv::MakeMock: Error %d opening database environment.", ret));
fDbEnvInit = true;
fMockDb = true;
}
CDBEnv::VerifyResult CDBEnv::Verify(const std::string& strFile, recoverFunc_type recoverFunc, std::string& out_backup_filename)
{
LOCK(cs_db);
assert(mapFileUseCount.count(strFile) == 0);
Db db(dbenv, 0);
int result = db.verify(strFile.c_str(), nullptr, nullptr, 0);
if (result == 0)
return VERIFY_OK;
else if (recoverFunc == nullptr)
return RECOVER_FAIL;
// Try to recover:
bool fRecovered = (*recoverFunc)(strFile, out_backup_filename);
return (fRecovered ? RECOVER_OK : RECOVER_FAIL);
}
bool CDB::Recover(const std::string& filename, void *callbackDataIn, bool (*recoverKVcallback)(void* callbackData, CDataStream ssKey, CDataStream ssValue), std::string& newFilename)
{
// Recovery procedure:
// move wallet file to walletfilename.timestamp.bak
// Call Salvage with fAggressive=true to
// get as much data as possible.
// Rewrite salvaged data to fresh wallet file
// Set -rescan so any missing transactions will be
// found.
int64_t now = GetTime();
newFilename = strprintf("%s.%d.bak", filename, now);
int result = bitdb.dbenv->dbrename(nullptr, filename.c_str(), nullptr,
newFilename.c_str(), DB_AUTO_COMMIT);
if (result == 0)
LogPrintf("Renamed %s to %s\n", filename, newFilename);
else
{
LogPrintf("Failed to rename %s to %s\n", filename, newFilename);
return false;
}
std::vector<CDBEnv::KeyValPair> salvagedData;
bool fSuccess = bitdb.Salvage(newFilename, true, salvagedData);
if (salvagedData.empty())
{
LogPrintf("Salvage(aggressive) found no records in %s.\n", newFilename);
return false;
}
LogPrintf("Salvage(aggressive) found %u records\n", salvagedData.size());
std::unique_ptr<Db> pdbCopy(new Db(bitdb.dbenv, 0));
int ret = pdbCopy->open(nullptr, // Txn pointer
filename.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", filename);
pdbCopy->close(0);
return false;
}
DbTxn* ptxn = bitdb.TxnBegin();
for (CDBEnv::KeyValPair& row : salvagedData)
{
if (recoverKVcallback)
{
CDataStream ssKey(row.first, SER_DISK, CLIENT_VERSION);
CDataStream ssValue(row.second, SER_DISK, CLIENT_VERSION);
if (!(*recoverKVcallback)(callbackDataIn, ssKey, ssValue))
continue;
}
Dbt datKey(&row.first[0], row.first.size());
Dbt datValue(&row.second[0], row.second.size());
int ret2 = pdbCopy->put(ptxn, &datKey, &datValue, DB_NOOVERWRITE);
if (ret2 > 0)
fSuccess = false;
}
ptxn->commit(0);
pdbCopy->close(0);
return fSuccess;
}
bool CDB::VerifyEnvironment(const std::string& walletFile, const fs::path& dataDir, std::string& errorStr)
{
LogPrintf("Using BerkeleyDB version %s\n", DbEnv::version(0, 0, 0));
LogPrintf("Using wallet %s\n", walletFile);
// Wallet file must be a plain filename without a directory
if (walletFile != fs::basename(walletFile) + fs::extension(walletFile))
{
errorStr = strprintf(_("Wallet %s resides outside data directory %s"), walletFile, dataDir.string());
return false;
}
if (!bitdb.Open(dataDir))
{
// try moving the database env out of the way
fs::path pathDatabase = dataDir / "database";
fs::path pathDatabaseBak = dataDir / strprintf("database.%d.bak", GetTime());
try {
fs::rename(pathDatabase, pathDatabaseBak);
LogPrintf("Moved old %s to %s. Retrying.\n", pathDatabase.string(), pathDatabaseBak.string());
} catch (const fs::filesystem_error&) {
// failure is ok (well, not really, but it's not worse than what we started with)
}
// try again
if (!bitdb.Open(dataDir)) {
// if it still fails, it probably means we can't even create the database env
errorStr = strprintf(_("Error initializing wallet database environment %s!"), GetDataDir());
return false;
}
}
return true;
}
bool CDB::VerifyDatabaseFile(const std::string& walletFile, const fs::path& dataDir, std::string& warningStr, std::string& errorStr, CDBEnv::recoverFunc_type recoverFunc)
{
if (fs::exists(dataDir / walletFile))
{
std::string backup_filename;
CDBEnv::VerifyResult r = bitdb.Verify(walletFile, recoverFunc, backup_filename);
if (r == CDBEnv::RECOVER_OK)
{
warningStr = strprintf(_("Warning: Wallet file corrupt, data salvaged!"
" Original %s saved as %s in %s; if"
" your balance or transactions are incorrect you should"
" restore from a backup."),
walletFile, backup_filename, dataDir);
}
if (r == CDBEnv::RECOVER_FAIL)
{
errorStr = strprintf(_("%s corrupt, salvage failed"), walletFile);
return false;
}
}
// also return true if files does not exists
return true;
}
/* End of headers, beginning of key/value data */
static const char *HEADER_END = "HEADER=END";
/* End of key/value data */
static const char *DATA_END = "DATA=END";
bool CDBEnv::Salvage(const 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;
std::stringstream strDump;
Db db(dbenv, 0);
int result = db.verify(strFile.c_str(), nullptr, &strDump, flags);
if (result == DB_VERIFY_BAD) {
LogPrintf("CDBEnv::Salvage: Database salvage found errors, all data may not be recoverable.\n");
if (!fAggressive) {
LogPrintf("CDBEnv::Salvage: Rerun with aggressive mode to ignore errors and continue.\n");
return false;
}
}
if (result != 0 && result != DB_VERIFY_BAD) {
LogPrintf("CDBEnv::Salvage: Database salvage failed with result %d.\n", result);
return false;
}
// Format of bdb dump is ascii lines:
// header lines...
// HEADER=END
// hexadecimal key
// hexadecimal value
// ... repeated
// DATA=END
std::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) {
if (strDump.eof())
break;
getline(strDump, valueHex);
if (valueHex == DATA_END) {
LogPrintf("CDBEnv::Salvage: WARNING: Number of keys in data does not match number of values.\n");
break;
}
vResult.push_back(make_pair(ParseHex(keyHex), ParseHex(valueHex)));
}
}
if (keyHex != DATA_END) {
LogPrintf("CDBEnv::Salvage: WARNING: Unexpected end of file while reading salvage output.\n");
return false;
}
return (result == 0);
}
void CDBEnv::CheckpointLSN(const std::string& strFile)
{
dbenv->txn_checkpoint(0, 0, 0);
if (fMockDb)
return;
dbenv->lsn_reset(strFile.c_str(), 0);
}
CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb(nullptr), activeTxn(nullptr)
{
fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
fFlushOnClose = fFlushOnCloseIn;
env = dbw.env;
if (dbw.IsDummy()) {
return;
}
const std::string &strFilename = dbw.strFile;
bool fCreate = strchr(pszMode, 'c') != nullptr;
unsigned int nFlags = DB_THREAD;
if (fCreate)
nFlags |= DB_CREATE;
{
LOCK(env->cs_db);
if (!env->Open(GetDataDir()))
throw std::runtime_error("CDB: Failed to open database environment.");
strFile = strFilename;
++env->mapFileUseCount[strFile];
pdb = env->mapDb[strFile];
if (pdb == nullptr) {
int ret;
pdb = new Db(env->dbenv, 0);
bool fMockDb = env->IsMock();
if (fMockDb) {
DbMpoolFile* mpf = pdb->get_mpf();
ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
if (ret != 0)
throw std::runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFile));
}
ret = pdb->open(nullptr, // Txn pointer
fMockDb ? nullptr : strFile.c_str(), // Filename
fMockDb ? strFile.c_str() : "main", // Logical db name
DB_BTREE, // Database type
nFlags, // Flags
0);
if (ret != 0) {
delete pdb;
pdb = nullptr;
--env->mapFileUseCount[strFile];
strFile = "";
throw std::runtime_error(strprintf("CDB: Error %d, can't open database %s", ret, strFilename));
}
if (fCreate && !Exists(std::string("version"))) {
bool fTmp = fReadOnly;
fReadOnly = false;
WriteVersion(CLIENT_VERSION);
fReadOnly = fTmp;
}
env->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;
env->dbenv->txn_checkpoint(nMinutes ? gArgs.GetArg("-dblogsize", DEFAULT_WALLET_DBLOGSIZE) * 1024 : 0, nMinutes, 0);
}
void CWalletDBWrapper::IncrementUpdateCounter()
{
++nUpdateCounter;
}
void CDB::Close()
{
if (!pdb)
return;
if (activeTxn)
activeTxn->abort();
activeTxn = nullptr;
pdb = nullptr;
if (fFlushOnClose)
Flush();
{
LOCK(env->cs_db);
--env->mapFileUseCount[strFile];
}
}
void CDBEnv::CloseDb(const std::string& strFile)
{
{
LOCK(cs_db);
if (mapDb[strFile] != nullptr) {
// Close the database handle
Db* pdb = mapDb[strFile];
pdb->close(0);
delete pdb;
mapDb[strFile] = nullptr;
}
}
}
bool CDB::Rewrite(CWalletDBWrapper& dbw, const char* pszSkip)
{
if (dbw.IsDummy()) {
return true;
}
CDBEnv *env = dbw.env;
const std::string& strFile = dbw.strFile;
while (true) {
{
LOCK(env->cs_db);
if (!env->mapFileUseCount.count(strFile) || env->mapFileUseCount[strFile] == 0) {
// Flush log data to the dat file
env->CloseDb(strFile);
env->CheckpointLSN(strFile);
env->mapFileUseCount.erase(strFile);
bool fSuccess = true;
LogPrintf("CDB::Rewrite: Rewriting %s...\n", strFile);
std::string strFileRes = strFile + ".rewrite";
{ // surround usage of db with extra {}
CDB db(dbw, "r");
Db* pdbCopy = new Db(env->dbenv, 0);
int ret = pdbCopy->open(nullptr, // Txn pointer
strFileRes.c_str(), // Filename
"main", // Logical db name
DB_BTREE, // Database type
DB_CREATE, // Flags
0);
if (ret > 0) {
LogPrintf("CDB::Rewrite: Can't 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 ret1 = db.ReadAtCursor(pcursor, ssKey, ssValue);
if (ret1 == DB_NOTFOUND) {
pcursor->close();
break;
} else if (ret1 != 0) {
pcursor->close();
fSuccess = false;
break;
}
if (pszSkip &&
strncmp(ssKey.data(), pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
continue;
if (strncmp(ssKey.data(), "\x07version", 8) == 0) {
// Update version:
ssValue.clear();
ssValue << CLIENT_VERSION;
}
Dbt datKey(ssKey.data(), ssKey.size());
Dbt datValue(ssValue.data(), ssValue.size());
int ret2 = pdbCopy->put(nullptr, &datKey, &datValue, DB_NOOVERWRITE);
if (ret2 > 0)
fSuccess = false;
}
if (fSuccess) {
db.Close();
env->CloseDb(strFile);
if (pdbCopy->close(0))
fSuccess = false;
} else {
pdbCopy->close(0);
}
delete pdbCopy;
}
if (fSuccess) {
Db dbA(env->dbenv, 0);
if (dbA.remove(strFile.c_str(), nullptr, 0))
fSuccess = false;
Db dbB(env->dbenv, 0);
if (dbB.rename(strFileRes.c_str(), nullptr, strFile.c_str(), 0))
fSuccess = false;
}
if (!fSuccess)
LogPrintf("CDB::Rewrite: Failed to rewrite database file %s\n", strFileRes);
return fSuccess;
}
}
MilliSleep(100);
}
}
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(BCLog::DB, "CDBEnv::Flush: Flush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started");
if (!fDbEnvInit)
return;
{
LOCK(cs_db);
std::map<std::string, int>::iterator mi = mapFileUseCount.begin();
while (mi != mapFileUseCount.end()) {
std::string strFile = (*mi).first;
int nRefCount = (*mi).second;
LogPrint(BCLog::DB, "CDBEnv::Flush: Flushing %s (refcount = %d)...\n", strFile, nRefCount);
if (nRefCount == 0) {
// Move log data to the dat file
CloseDb(strFile);
LogPrint(BCLog::DB, "CDBEnv::Flush: %s checkpoint\n", strFile);
dbenv->txn_checkpoint(0, 0, 0);
LogPrint(BCLog::DB, "CDBEnv::Flush: %s detach\n", strFile);
if (!fMockDb)
dbenv->lsn_reset(strFile.c_str(), 0);
LogPrint(BCLog::DB, "CDBEnv::Flush: %s closed\n", strFile);
mapFileUseCount.erase(mi++);
} else
mi++;
}
LogPrint(BCLog::DB, "CDBEnv::Flush: Flush(%s)%s took %15dms\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started", GetTimeMillis() - nStart);
if (fShutdown) {
char** listp;
if (mapFileUseCount.empty()) {
dbenv->log_archive(&listp, DB_ARCH_REMOVE);
Close();
if (!fMockDb)
fs::remove_all(fs::path(strPath) / "database");
}
}
}
}
bool CDB::PeriodicFlush(CWalletDBWrapper& dbw)
{
if (dbw.IsDummy()) {
return true;
}
bool ret = false;
CDBEnv *env = dbw.env;
const std::string& strFile = dbw.strFile;
TRY_LOCK(bitdb.cs_db,lockDb);
if (lockDb)
{
// Don't do this if any databases are in use
int nRefCount = 0;
std::map<std::string, int>::iterator mit = env->mapFileUseCount.begin();
while (mit != env->mapFileUseCount.end())
{
nRefCount += (*mit).second;
mit++;
}
if (nRefCount == 0)
{
boost::this_thread::interruption_point();
std::map<std::string, int>::iterator mi = env->mapFileUseCount.find(strFile);
if (mi != env->mapFileUseCount.end())
{
LogPrint(BCLog::DB, "Flushing %s\n", strFile);
int64_t nStart = GetTimeMillis();
// Flush wallet file so it's self contained
env->CloseDb(strFile);
env->CheckpointLSN(strFile);
env->mapFileUseCount.erase(mi++);
LogPrint(BCLog::DB, "Flushed %s %dms\n", strFile, GetTimeMillis() - nStart);
ret = true;
}
}
}
return ret;
}
bool CWalletDBWrapper::Rewrite(const char* pszSkip)
{
return CDB::Rewrite(*this, pszSkip);
}
bool CWalletDBWrapper::Backup(const std::string& strDest)
{
if (IsDummy()) {
return false;
}
while (true)
{
{
LOCK(env->cs_db);
if (!env->mapFileUseCount.count(strFile) || env->mapFileUseCount[strFile] == 0)
{
// Flush log data to the dat file
env->CloseDb(strFile);
env->CheckpointLSN(strFile);
env->mapFileUseCount.erase(strFile);
// Copy wallet file
fs::path pathSrc = GetDataDir() / strFile;
fs::path pathDest(strDest);
if (fs::is_directory(pathDest))
pathDest /= strFile;
try {
fs::copy_file(pathSrc, pathDest, fs::copy_option::overwrite_if_exists);
LogPrintf("copied %s to %s\n", strFile, pathDest.string());
return true;
} catch (const fs::filesystem_error& e) {
LogPrintf("error copying %s to %s - %s\n", strFile, pathDest.string(), e.what());
return false;
}
}
}
MilliSleep(100);
}
}
void CWalletDBWrapper::Flush(bool shutdown)
{
if (!IsDummy()) {
env->Flush(shutdown);
}
}