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/*
* Copyright (C) 2018 Christian Mollekopf <mollekopf@kolabsys.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
//xapian.h needs to be included first to build
#include <xapian.h>
#include "fulltextindex.h"
#include <QFile>
#include <QDir>
#include "log.h"
#include "definitions.h"
FulltextIndex::FulltextIndex(const QByteArray &resourceInstanceIdentifier, Sink::Storage::DataStore::AccessMode accessMode)
: mName("fulltext"),
mDbPath{QFile::encodeName(Sink::resourceStorageLocation(resourceInstanceIdentifier) + '/' + "fulltext")}
{
try {
if (QDir{}.mkpath(mDbPath)) {
if (accessMode == Sink::Storage::DataStore::ReadWrite) {
mDb = new Xapian::WritableDatabase(mDbPath.toStdString(), Xapian::DB_CREATE_OR_OPEN);
} else {
mDb = new Xapian::Database(mDbPath.toStdString(), Xapian::DB_OPEN);
}
} else {
SinkError() << "Failed to open database" << mDbPath;
}
} catch (const Xapian::DatabaseError& e) {
SinkError() << "Failed to open database" << mDbPath << ":" << QString::fromStdString(e.get_msg());
}
}
FulltextIndex::~FulltextIndex()
{
delete mDb;
}
static std::string idTerm(const QByteArray &key)
{
return "Q" + key.toStdString();
}
void FulltextIndex::add(const QByteArray &key, const QString &value)
{
add(key, {{{}, value}});
}
void FulltextIndex::add(const QByteArray &key, const QList<QPair<QString, QString>> &values)
{
if (!mDb) {
return;
}
try {
Xapian::TermGenerator generator;
Xapian::Document document;
generator.set_document(document);
for (const auto &entry : values) {
if (!entry.second.isEmpty()) {
generator.index_text(entry.second.toStdString());
}
}
document.add_value(0, key.toStdString());
const auto idterm = idTerm(key);
document.add_boolean_term(idterm);
writableDatabase()->replace_document(idterm, document);
}
catch (const Xapian::Error &error) {
SinkError() << "Exception during Xapian commit_transaction:" << error.get_msg().c_str();
//FIXME we should somehow retry the transaction...
Q_ASSERT(false);
}
}
void FulltextIndex::commitTransaction()
{
if (mHasTransactionOpen) {
Q_ASSERT(mDb);
try {
writableDatabase()->commit_transaction();
mHasTransactionOpen = false;
}
catch (const Xapian::Error &error) {
SinkError() << "Exception during Xapian commit_transaction:" << error.get_msg().c_str();
//FIXME we should somehow retry the transaction...
Q_ASSERT(false);
}
}
}
void FulltextIndex::abortTransaction()
{
if (mHasTransactionOpen) {
Q_ASSERT(mDb);
try {
writableDatabase()->cancel_transaction();
mHasTransactionOpen = false;
}
catch (const Xapian::Error &error) {
SinkError() << "Exception during Xapian cancel_transaction:" << error.get_msg().c_str();
//FIXME we should somehow retry the transaction...
Q_ASSERT(false);
}
}
}
Xapian::WritableDatabase* FulltextIndex::writableDatabase()
{
Q_ASSERT(dynamic_cast<Xapian::WritableDatabase*>(mDb));
auto db = static_cast<Xapian::WritableDatabase*>(mDb);
if (!mHasTransactionOpen) {
try {
db->begin_transaction();
mHasTransactionOpen = true;
}
catch (const Xapian::Error &error) {
SinkError() << "Exception during Xapian begin_transaction:" << error.get_msg().c_str();
//FIXME we should somehow retry the transaction...
Q_ASSERT(false);
}
}
return db;
}
void FulltextIndex::remove(const QByteArray &key)
{
if (!mDb) {
return;
}
try {
writableDatabase()->delete_document(idTerm(key));
}
catch (const Xapian::Error &error) {
SinkError() << "Exception during Xapian delete_document:" << error.get_msg().c_str();
//FIXME we should somehow retry the transaction...
Q_ASSERT(false);
}
}
QVector<QByteArray> FulltextIndex::lookup(const QString &searchTerm)
{
if (!mDb) {
return {};
}
QVector<QByteArray> results;
try {
Xapian::QueryParser parser;
auto query = parser.parse_query(searchTerm.toStdString(), Xapian::QueryParser::FLAG_WILDCARD|Xapian::QueryParser::FLAG_PHRASE|Xapian::QueryParser::FLAG_BOOLEAN|Xapian::QueryParser::FLAG_LOVEHATE|Xapian::QueryParser::FLAG_PARTIAL);
Xapian::Enquire enquire(*mDb);
enquire.set_query(query);
auto limit = 1000;
Xapian::MSet mset = enquire.get_mset(0, limit);
Xapian::MSetIterator it = mset.begin();
for (;it != mset.end(); it++) {
auto doc = it.get_document();
const auto data = doc.get_value(0);
results << QByteArray{data.c_str(), int(data.length())};
}
}
catch (const Xapian::Error &error) {
// Nothing to do, move along
}
return results;
}
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