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lbrycrd/src/wallet/db.cpp
Russell Yanofsky be8ab7d082 Create new wallet databases as directories rather than files 
This change should make it easier for users to make complete backups of wallets
because they can now just back up the specified `-wallet=<path>` path directly,
instead of having to back up the specified path as well as the transaction log
directory (for incompletely flushed wallets).

Another advantage of this change is that if two wallets are located in the same
directory, they will now use their own BerkeleyDB environments instead using a
shared environment. Using a shared environment makes it difficult to manage and
back up wallets separately because transaction log files will contain a mix of
data from all wallets in the environment.
2018-03-03 10:26:55 -05:00

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 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 <wallet/db.h>
#include <addrman.h>
#include <hash.h>
#include <protocol.h>
#include <util.h>
#include <utilstrencodings.h>
#include <wallet/walletutil.h>
#include <stdint.h>
#ifndef WIN32
#include <sys/stat.h>
#endif
#include <boost/thread.hpp>
namespace {
//! Make sure database has a unique fileid within the environment. If it
//! doesn't, throw an error. BDB caches do not work properly when more than one
//! open database has the same fileid (values written to one database may show
//! up in reads to other databases).
//!
//! BerkeleyDB generates unique fileids by default
//! (https://docs.oracle.com/cd/E17275_01/html/programmer_reference/program_copy.html),
//! so bitcoin should never create different databases with the same fileid, but
//! this error can be triggered if users manually copy database files.
void CheckUniqueFileid(const CDBEnv& env, const std::string& filename, Db& db)
{
if (env.IsMock()) return;
u_int8_t fileid[DB_FILE_ID_LEN];
int ret = db.get_mpf()->get_fileid(fileid);
if (ret != 0) {
throw std::runtime_error(strprintf("CDB: Can't open database %s (get_fileid failed with %d)", filename, ret));
}
for (const auto& item : env.mapDb) {
u_int8_t item_fileid[DB_FILE_ID_LEN];
if (item.second && item.second->get_mpf()->get_fileid(item_fileid) == 0 &&
memcmp(fileid, item_fileid, sizeof(fileid)) == 0) {
const char* item_filename = nullptr;
item.second->get_dbname(&item_filename, nullptr);
throw std::runtime_error(strprintf("CDB: Can't open database %s (duplicates fileid %s from %s)", filename,
HexStr(std::begin(item_fileid), std::end(item_fileid)),
item_filename ? item_filename : "(unknown database)"));
}
}
}
CCriticalSection cs_db;
std::map<std::string, CDBEnv> g_dbenvs; //!< Map from directory name to open db environment.
} // namespace
CDBEnv* GetWalletEnv(const fs::path& wallet_path, std::string& database_filename)
{
fs::path env_directory;
if (fs::is_regular_file(wallet_path)) {
// Special case for backwards compatibility: if wallet path points to an
// existing file, treat it as the path to a BDB data file in a parent
// directory that also contains BDB log files.
env_directory = wallet_path.parent_path();
database_filename = wallet_path.filename().string();
} else {
// Normal case: Interpret wallet path as a directory path containing
// data and log files.
env_directory = wallet_path;
database_filename = "wallet.dat";
}
LOCK(cs_db);
// Note: An ununsed temporary CDBEnv object may be created inside the
// emplace function if the key already exists. This is a little inefficient,
// but not a big concern since the map will be changed in the future to hold
// pointers instead of objects, anyway.
return &g_dbenvs.emplace(std::piecewise_construct, std::forward_as_tuple(env_directory.string()), std::forward_as_tuple(env_directory)).first->second;
}
//
// CDB
//
void CDBEnv::Close()
{
if (!fDbEnvInit)
return;
fDbEnvInit = false;
for (auto& db : mapDb) {
auto count = mapFileUseCount.find(db.first);
assert(count == mapFileUseCount.end() || count->second == 0);
if (db.second) {
db.second->close(0);
delete db.second;
db.second = nullptr;
}
}
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()
{
dbenv.reset(new DbEnv(DB_CXX_NO_EXCEPTIONS));
fDbEnvInit = false;
fMockDb = false;
}
CDBEnv::CDBEnv(const fs::path& dir_path) : strPath(dir_path.string())
{
Reset();
}
CDBEnv::~CDBEnv()
{
Close();
}
bool CDBEnv::Open(bool retry)
{
if (fDbEnvInit)
return true;
boost::this_thread::interruption_point();
fs::path pathIn = strPath;
TryCreateDirectories(pathIn);
if (!LockDirectory(pathIn, ".walletlock")) {
LogPrintf("Cannot obtain a lock on wallet directory %s. Another instance of bitcoin may be using it.\n", strPath);
return false;
}
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);
LogPrintf("CDBEnv::Open: Error %d opening database environment: %s\n", ret, DbEnv::strerror(ret));
if (retry) {
// try moving the database env out of the way
fs::path pathDatabaseBak = pathIn / strprintf("database.%d.bak", GetTime());
try {
fs::rename(pathLogDir, pathDatabaseBak);
LogPrintf("Moved old %s to %s. Retrying.\n", pathLogDir.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 opening it again one more time
if (!Open(false /* retry */)) {
// if it still fails, it probably means we can't even create the database env
return false;
}
} else {
return false;
}
}
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.get(), 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)(fs::path(strPath) / strFile, out_backup_filename);
return (fRecovered ? RECOVER_OK : RECOVER_FAIL);
}
bool CDB::Recover(const fs::path& file_path, void *callbackDataIn, bool (*recoverKVcallback)(void* callbackData, CDataStream ssKey, CDataStream ssValue), std::string& newFilename)
{
std::string filename;
CDBEnv* env = GetWalletEnv(file_path, filename);
// 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 = env->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 = env->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 = MakeUnique<Db>(env->dbenv.get(), 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 = env->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 fs::path& file_path, std::string& errorStr)
{
std::string walletFile;
CDBEnv* env = GetWalletEnv(file_path, walletFile);
fs::path walletDir = env->Directory();
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 wallet directory %s"), walletFile, walletDir.string());
return false;
}
if (!env->Open(true /* retry */)) {
errorStr = strprintf(_("Error initializing wallet database environment %s!"), walletDir);
return false;
}
return true;
}
bool CDB::VerifyDatabaseFile(const fs::path& file_path, std::string& warningStr, std::string& errorStr, CDBEnv::recoverFunc_type recoverFunc)
{
std::string walletFile;
CDBEnv* env = GetWalletEnv(file_path, walletFile);
fs::path walletDir = env->Directory();
if (fs::exists(walletDir / walletFile))
{
std::string backup_filename;
CDBEnv::VerifyResult r = env->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, walletDir);
}
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.get(), 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(cs_db);
if (!env->Open(false /* retry */))
throw std::runtime_error("CDB: Failed to open database environment.");
pdb = env->mapDb[strFilename];
if (pdb == nullptr) {
int ret;
std::unique_ptr<Db> pdb_temp = MakeUnique<Db>(env->dbenv.get(), 0);
bool fMockDb = env->IsMock();
if (fMockDb) {
DbMpoolFile* mpf = pdb_temp->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", strFilename));
}
}
ret = pdb_temp->open(nullptr, // Txn pointer
fMockDb ? nullptr : strFilename.c_str(), // Filename
fMockDb ? strFilename.c_str() : "main", // Logical db name
DB_BTREE, // Database type
nFlags, // Flags
0);
if (ret != 0) {
throw std::runtime_error(strprintf("CDB: Error %d, can't open database %s", ret, strFilename));
}
// Call CheckUniqueFileid on the containing BDB environment to
// avoid BDB data consistency bugs that happen when different data
// files in the same environment have the same fileid.
//
// Also call CheckUniqueFileid on all the other g_dbenvs to prevent
// bitcoin from opening the same data file through another
// environment when the file is referenced through equivalent but
// not obviously identical symlinked or hard linked or bind mounted
// paths. In the future a more relaxed check for equal inode and
// device ids could be done instead, which would allow opening
// different backup copies of a wallet at the same time. Maybe even
// more ideally, an exclusive lock for accessing the database could
// be implemented, so no equality checks are needed at all. (Newer
// versions of BDB have an set_lk_exclusive method for this
// purpose, but the older version we use does not.)
for (auto& env : g_dbenvs) {
CheckUniqueFileid(env.second, strFilename, *pdb_temp);
}
pdb = pdb_temp.release();
env->mapDb[strFilename] = pdb;
if (fCreate && !Exists(std::string("version"))) {
bool fTmp = fReadOnly;
fReadOnly = false;
WriteVersion(CLIENT_VERSION);
fReadOnly = fTmp;
}
}
++env->mapFileUseCount[strFilename];
strFile = strFilename;
}
}
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(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(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");
std::unique_ptr<Db> pdbCopy = MakeUnique<Db>(env->dbenv.get(), 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);
}
}
if (fSuccess) {
Db dbA(env->dbenv.get(), 0);
if (dbA.remove(strFile.c_str(), nullptr, 0))
fSuccess = false;
Db dbB(env->dbenv.get(), 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(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(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 = GetWalletDir() / strFile;
fs::path pathDest(strDest);
if (fs::is_directory(pathDest))
pathDest /= strFile;
try {
if (fs::equivalent(pathSrc, pathDest)) {
LogPrintf("cannot backup to wallet source file %s\n", pathDest.string());
return false;
}
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);
}
}
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