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#include "storage.h"
#include <iostream>
#include <QAtomicInt>
#include <QDebug>
#include <QDir>
#include <QFileInfo>
#include <QReadWriteLock>
#include <QString>
#include <QTime>
#include <kchashdb.h>
class Storage::Private
{
public:
Private(const QString &storageRoot, const QString &name, AccessMode m);
~Private();
QString name;
kyotocabinet::TreeDB db;
AccessMode mode;
bool dbOpen;
bool inTransaction;
};
Storage::Private::Private(const QString &storageRoot, const QString &n, AccessMode m)
: name(n),
mode(m),
dbOpen(false),
inTransaction(false)
{
QDir dir;
dir.mkdir(storageRoot);
//create file
uint32_t openMode = kyotocabinet::BasicDB::OCREATE |
(mode == ReadOnly ? kyotocabinet::BasicDB::OREADER
: kyotocabinet::BasicDB::OWRITER);
dbOpen = db.open((storageRoot + "/" + name + ".kch").toStdString(), openMode);
if (!dbOpen) {
std::cerr << "Could not open database: " << db.error().codename(db.error().code()) << " " << db.error().message() << std::endl;
// TODO: handle error
}
}
Storage::Private::~Private()
{
if (dbOpen && inTransaction) {
db.end_transaction(false);
}
}
Storage::Storage(const QString &storageRoot, const QString &name, AccessMode mode)
: d(new Private(storageRoot, name, mode))
{
}
Storage::~Storage()
{
delete d;
}
bool Storage::isInTransaction() const
{
return d->inTransaction;
}
bool Storage::startTransaction(AccessMode type)
{
if (!d->dbOpen) {
return false;
}
if (type == ReadWrite && d->mode != ReadWrite) {
return false;
}
if (d->inTransaction) {
return true;
}
//TODO handle errors
d->inTransaction = d->db.begin_transaction();
return d->inTransaction;
}
bool Storage::commitTransaction()
{
if (!d->dbOpen) {
return false;
}
if (!d->inTransaction) {
return false;
}
bool success = d->db.end_transaction(true);
d->inTransaction = false;
return success;
}
void Storage::abortTransaction()
{
if (!d->dbOpen || !d->inTransaction) {
return;
}
d->db.end_transaction(false);
d->inTransaction = false;
}
bool Storage::write(const char *key, size_t keySize, const char *value, size_t valueSize)
{
if (!d->dbOpen) {
return false;
}
bool success = d->db.set(key, keySize, value, valueSize);
return success;
}
bool Storage::write(const std::string &sKey, const std::string &sValue)
{
if (!d->dbOpen) {
return false;
}
bool success = d->db.set(sKey, sValue);
return success;
}
void Storage::read(const std::string &sKey,
const std::function<bool(const std::string &value)> &resultHandler,
const std::function<void(const Storage::Error &error)> &errorHandler)
{
if (!d->dbOpen) {
Error error(d->name.toStdString(), -1, "Not open");
errorHandler(error);
return;
}
std::string value;
if (sKey.empty()) {
kyotocabinet::DB::Cursor *cursor = d->db.cursor();
cursor->jump();
std::string key, value;
while (cursor->get_value(&value, true) && resultHandler(value)) {}
delete cursor;
return;
} else {
if (d->db.get(sKey, &value)) {
resultHandler(value);
return;
}
}
Error error(d->name.toStdString(), d->db.error().code(), d->db.error().message());
errorHandler(error);
}
void Storage::read(const std::string &sKey,
const std::function<bool(void *ptr, int size)> &resultHandler,
const std::function<void(const Storage::Error &error)> &errorHandler)
{
if (!d->dbOpen) {
Error error(d->name.toStdString(), -1, "Not open");
errorHandler(error);
return;
}
size_t valueSize;
char *valueBuffer;
if (sKey.empty()) {
kyotocabinet::DB::Cursor *cursor = d->db.cursor();
cursor->jump();
while ((valueBuffer = cursor->get_value(&valueSize, true))) {
bool ok = resultHandler(valueBuffer, valueSize);
delete[] valueBuffer;
if (!ok) {
break;
}
}
delete cursor;
} else {
valueBuffer = d->db.get(sKey.data(), sKey.size(), &valueSize);
if (valueBuffer) {
resultHandler(valueBuffer, valueSize);
} else {
Error error(d->name.toStdString(), d->db.error().code(), d->db.error().message());
errorHandler(error);
}
delete[] valueBuffer;
}
}
qint64 Storage::diskUsage() const
{
if (!d->dbOpen) {
return 0;
}
QFileInfo info(QString::fromStdString(d->db.path()));
return info.size();
}
void Storage::removeFromDisk() const
{
if (!d->dbOpen) {
return;
}
QFileInfo info(QString::fromStdString(d->db.path()));
QDir dir = info.dir();
dir.remove(info.fileName());
}
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