kolab_storage_cache.php
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kolab_storage_cache.php
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	<?php

	/**
	* Kolab storage cache class providing a local caching layer for Kolab groupware objects.
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2012-2013, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	class kolab_storage_cache
	{
	const DB_DATE_FORMAT = 'Y-m-d H:i:s';

	protected $db;
	protected $imap;
	protected $folder;
	protected $uid2msg;
	protected $objects;
	protected $metadata = array();
	protected $folder_id;
	protected $resource_uri;
	protected $enabled = true;
	protected $synched = false;
	protected $synclock = false;
	protected $ready = false;
	protected $cache_table;
	protected $folders_table;
	protected $max_sql_packet;
	protected $max_sync_lock_time = 600;
	protected $binary_items = array();
	protected $extra_cols = array();
	protected $order_by = null;
	protected $limit = null;


	/**
	* Factory constructor
	*/
	public static function factory(kolab_storage_folder $storage_folder)
	{
	$subclass = 'kolab_storage_cache_' . $storage_folder->type;
	if (class_exists($subclass)) {
	return new $subclass($storage_folder);
	}
	else {
	rcube::raise_error(array(
	'code' => 900,
	'type' => 'php',
	'message' => "No kolab_storage_cache class found for folder '$storage_folder->name' of type '$storage_folder->type'"
	), true);

	return new kolab_storage_cache($storage_folder);
	}
	}


	/**
	* Default constructor
	*/
	public function __construct(kolab_storage_folder $storage_folder = null)
	{
	$rcmail = rcube::get_instance();
	$this->db = $rcmail->get_dbh();
	$this->imap = $rcmail->get_storage();
	$this->enabled = $rcmail->config->get('kolab_cache', false);

	if ($this->enabled) {
	// always read folder cache and lock state from DB master
	$this->db->set_table_dsn('kolab_folders', 'w');
	// remove sync-lock on script termination
	$rcmail->add_shutdown_function(array($this, '_sync_unlock'));
	}

	if ($storage_folder)
	$this->set_folder($storage_folder);
	}

	/**
	* Direct access to cache by folder_id
	* (only for internal use)
	*/
	public function select_by_id($folder_id)
	{
	$folders_table = $this->db->table_name('kolab_folders');
	$sql_arr = $this->db->fetch_assoc($this->db->query("SELECT * FROM $folders_table WHERE folder_id=?", $folder_id));
	if ($sql_arr) {
	$this->metadata = $sql_arr;
	$this->folder_id = $sql_arr['folder_id'];
	$this->folder = new StdClass;
	$this->folder->type = $sql_arr['type'];
	$this->resource_uri = $sql_arr['resource'];
	$this->cache_table = $this->db->table_name('kolab_cache_' . $sql_arr['type']);
	$this->ready = true;
	}
	}

	/**
	* Connect cache with a storage folder
	*
	* @param kolab_storage_folder The storage folder instance to connect with
	*/
	public function set_folder(kolab_storage_folder $storage_folder)
	{
	$this->folder = $storage_folder;

	if (empty($this->folder->name)) {
	$this->ready = false;
	return;
	}

	// compose fully qualified ressource uri for this instance
	$this->resource_uri = $this->folder->get_resource_uri();
	$this->folders_table = $this->db->table_name('kolab_folders');
	$this->cache_table = $this->db->table_name('kolab_cache_' . $this->folder->type);
	$this->ready = $this->enabled && !empty($this->folder->type);
	$this->folder_id = null;
	}

	/**
	* Returns true if this cache supports query by type
	*/
	public function has_type_col()
	{
	return in_array('type', $this->extra_cols);
	}

	/**
	* Getter for the numeric ID used in cache tables
	*/
	public function get_folder_id()
	{
	$this->_read_folder_data();
	return $this->folder_id;
	}

	/**
	* Synchronize local cache data with remote
	*/
	public function synchronize()
	{
	// only sync once per request cycle
	if ($this->synched)
	return;

	// increase time limit
	@set_time_limit($this->max_sync_lock_time);

	if (!$this->ready) {
	// kolab cache is disabled, synchronize IMAP mailbox cache only
	$this->imap->folder_sync($this->folder->name);
	}
	else {
	// read cached folder metadata
	$this->_read_folder_data();

	// check cache status hash first ($this->metadata is set in _read_folder_data())
	if ($this->metadata['ctag'] != $this->folder->get_ctag()) {
	// lock synchronization for this folder or wait if locked
	$this->_sync_lock();

	// disable messages cache if configured to do so
	$this->bypass(true);

	// synchronize IMAP mailbox cache
	$this->imap->folder_sync($this->folder->name);

	// compare IMAP index with object cache index
	$imap_index = $this->imap->index($this->folder->name, null, null, true, true);

	// determine objects to fetch or to invalidate
	if (!$imap_index->is_error()) {
	$imap_index = $imap_index->get();

	// read cache index
	$sql_result = $this->db->query(
	"SELECT msguid, uid FROM $this->cache_table WHERE folder_id=?",
	$this->folder_id
	);

	$old_index = array();
	while ($sql_arr = $this->db->fetch_assoc($sql_result)) {
	$old_index[] = $sql_arr['msguid'];
	$this->uid2msg[$sql_arr['uid']] = $sql_arr['msguid'];
	}

	// fetch new objects from imap
	foreach (array_diff($imap_index, $old_index) as $msguid) {
	if ($object = $this->folder->read_object($msguid, '*')) {
	$this->_extended_insert($msguid, $object);
	}
	}
	$this->_extended_insert(0, null);

	// delete invalid entries from local DB
	$del_index = array_diff($old_index, $imap_index);
	if (!empty($del_index)) {
	$quoted_ids = join(',', array_map(array($this->db, 'quote'), $del_index));
	$this->db->query(
	"DELETE FROM $this->cache_table WHERE folder_id=? AND msguid IN ($quoted_ids)",
	$this->folder_id
	);
	}

	// update ctag value (will be written to database in _sync_unlock())
	$this->metadata['ctag'] = $this->folder->get_ctag();
	}

	$this->bypass(false);

	// remove lock
	$this->_sync_unlock();
	}
	}

	$this->synched = time();
	}


	/**
	* Read a single entry from cache or from IMAP directly
	*
	* @param string Related IMAP message UID
	* @param string Object type to read
	* @param string IMAP folder name the entry relates to
	* @param array Hash array with object properties or null if not found
	*/
	public function get($msguid, $type = null, $foldername = null)
	{
	// delegate to another cache instance
	if ($foldername && $foldername != $this->folder->name) {
	return kolab_storage::get_folder($foldername)->cache->get($msguid, $type);
	}

	// load object if not in memory
	if (!isset($this->objects[$msguid])) {
	if ($this->ready) {
	$this->_read_folder_data();

	$sql_result = $this->db->query(
	"SELECT * FROM $this->cache_table ".
	"WHERE folder_id=? AND msguid=?",
	$this->folder_id,
	$msguid
	);

	if ($sql_arr = $this->db->fetch_assoc($sql_result)) {
	$this->objects = array($msguid => $this->_unserialize($sql_arr)); // store only this object in memory (#2827)
	}
	}

	// fetch from IMAP if not present in cache
	if (empty($this->objects[$msguid])) {
	$result = $this->_fetch(array($msguid), $type, $foldername);
	$this->objects = array($msguid => $result[0]); // store only this object in memory (#2827)
	}
	}

	return $this->objects[$msguid];
	}


	/**
	* Insert/Update a cache entry
	*
	* @param string Related IMAP message UID
	* @param mixed Hash array with object properties to save or false to delete the cache entry
	* @param string IMAP folder name the entry relates to
	*/
	public function set($msguid, $object, $foldername = null)
	{
	if (!$msguid) {
	return;
	}

	// delegate to another cache instance
	if ($foldername && $foldername != $this->folder->name) {
	kolab_storage::get_folder($foldername)->cache->set($msguid, $object);
	return;
	}

	// remove old entry
	if ($this->ready) {
	$this->_read_folder_data();
	$this->db->query("DELETE FROM $this->cache_table WHERE folder_id=? AND msguid=?",
	$this->folder_id, $msguid);
	}

	if ($object) {
	// insert new object data...
	$this->save($msguid, $object);
	}
	else {
	// ...or set in-memory cache to false
	$this->objects[$msguid] = $object;
	}
	}


	/**
	* Insert (or update) a cache entry
	*
	* @param int Related IMAP message UID
	* @param mixed Hash array with object properties to save or false to delete the cache entry
	* @param int Optional old message UID (for update)
	*/
	public function save($msguid, $object, $olduid)
	{
	// write to cache
	if ($this->ready) {
	$this->_read_folder_data();

	$sql_data = $this->_serialize($object);
	$sql_data['folder_id'] = $this->folder_id;
	$sql_data['msguid'] = $msguid;
	$sql_data['uid'] = $object['uid'];

	$args = array();
	$cols = array('folder_id', 'msguid', 'uid', 'changed', 'data', 'xml', 'tags', 'words');
	$cols = array_merge($cols, $this->extra_cols);

	foreach ($cols as $idx => $col) {
	$cols[$idx] = $this->db->quote_identifier($col);
	$args[] = $sql_data[$col];
	}

	if ($olduid) {
	foreach ($cols as $idx => $col) {
	$cols[$idx] = "$col = ?";
	}

	$query = "UPDATE $this->cache_table SET " . implode(', ', $cols)
	. " WHERE folder_id = ? AND msguid = ?";
	$args[] = $this->folder_id;
	$args[] = $olduid;
	}
	else {
	$query = "INSERT INTO $this->cache_table (created, " . implode(', ', $cols)
	. ") VALUES (" . $this->db->now() . str_repeat(', ?', count($cols)) . ")";
	}

	$result = $this->db->query($query, $args);

	if (!$this->db->affected_rows($result)) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "Failed to write to kolab cache"
	), true);
	}
	}

	// keep a copy in memory for fast access
	$this->objects = array($msguid => $object);
	$this->uid2msg = array($object['uid'] => $msguid);
	}


	/**
	* Move an existing cache entry to a new resource
	*
	* @param string Entry's IMAP message UID
	* @param string Entry's Object UID
	* @param string Target IMAP folder to move it to
	*/
	public function move($msguid, $uid, $target_folder)
	{
	if ($this->ready) {
	$target = kolab_storage::get_folder($target_folder);

	// resolve new message UID in target folder
	if ($new_msguid = $target->cache->uid2msguid($uid)) {
	$this->_read_folder_data();

	$this->db->query(
	"UPDATE $this->cache_table SET folder_id=?, msguid=? ".
	"WHERE folder_id=? AND msguid=?",
	$target->cache->get_folder_id(),
	$new_msguid,
	$this->folder_id,
	$msguid
	);

	$result = $this->db->affected_rows();
	}
	}

	if (empty($result)) {
	// just clear cache entry
	$this->set($msguid, false);
	}

	unset($this->uid2msg[$uid]);
	}


	/**
	* Remove all objects from local cache
	*/
	public function purge($type = null)
	{
	if (!$this->ready) {
	return true;
	}

	$this->_read_folder_data();

	$result = $this->db->query(
	"DELETE FROM $this->cache_table WHERE folder_id=?",
	$this->folder_id
	);

	return $this->db->affected_rows($result);
	}

	/**
	* Update resource URI for existing cache entries
	*
	* @param string Target IMAP folder to move it to
	*/
	public function rename($new_folder)
	{
	if (!$this->ready) {
	return;
	}

	$target = kolab_storage::get_folder($new_folder);

	// resolve new message UID in target folder
	$this->db->query(
	"UPDATE $this->folders_table SET resource=? ".
	"WHERE resource=?",
	$target->get_resource_uri(),
	$this->resource_uri
	);
	}

	/**
	* Select Kolab objects filtered by the given query
	*
	* @param array Pseudo-SQL query as list of filter parameter triplets
	* triplet: array('<colname>', '<comparator>', '<value>')
	* @param boolean Set true to only return UIDs instead of complete objects
	* @return array List of Kolab data objects (each represented as hash array) or UIDs
	*/
	public function select($query = array(), $uids = false)
	{
	$result = $uids ? array() : new kolab_storage_dataset($this);

	// read from local cache DB (assume it to be synchronized)
	if ($this->ready) {
	$this->_read_folder_data();

	// fetch full object data on one query if a small result set is expected
	$fetchall = !$uids && ($this->limit ? $this->limit[0] : $this->count($query)) < 500;
	$sql_query = "SELECT " . ($fetchall ? '*' : 'msguid AS _msguid, uid') . " FROM $this->cache_table ".
	"WHERE folder_id=? " . $this->_sql_where($query);
	if (!empty($this->order_by)) {
	$sql_query .= ' ORDER BY ' . $this->order_by;
	}
	$sql_result = $this->limit ?
	$this->db->limitquery($sql_query, $this->limit[1], $this->limit[0], $this->folder_id) :
	$this->db->query($sql_query, $this->folder_id);

	if ($this->db->is_error($sql_result)) {
	if ($uids) {
	return null;
	}
	$result->set_error(true);
	return $result;
	}

	while ($sql_arr = $this->db->fetch_assoc($sql_result)) {
	if ($uids) {
	$this->uid2msg[$sql_arr['uid']] = $sql_arr['_msguid'];
	$result[] = $sql_arr['uid'];
	}
	else if ($fetchall && ($object = $this->_unserialize($sql_arr))) {
	$result[] = $object;
	}
	else {
	// only add msguid to dataset index
	$result[] = $sql_arr;
	}
	}
	}
	// use IMAP
	else {
	$filter = $this->_query2assoc($query);

	if ($filter['type']) {
	$search = 'UNDELETED HEADER X-Kolab-Type ' . kolab_format::KTYPE_PREFIX . $filter['type'];
	$index = $this->imap->search_once($this->folder->name, $search);
	}
	else {
	$index = $this->imap->index($this->folder->name, null, null, true, true);
	}

	if ($index->is_error()) {
	if ($uids) {
	return null;
	}
	$result->set_error(true);
	return $result;
	}

	$index = $index->get();
	$result = $uids ? $index : $this->_fetch($index, $filter['type']);

	// TODO: post-filter result according to query
	}

	// We don't want to cache big results in-memory, however
	// if we select only one object here, there's a big chance we will need it later
	if (!$uids && count($result) == 1) {
	if ($msguid = $result[0]['_msguid']) {
	$this->uid2msg[$result[0]['uid']] = $msguid;
	$this->objects = array($msguid => $result[0]);
	}
	}

	return $result;
	}


	/**
	* Get number of objects mathing the given query
	*
	* @param array $query Pseudo-SQL query as list of filter parameter triplets
	* @return integer The number of objects of the given type
	*/
	public function count($query = array())
	{
	// read from local cache DB (assume it to be synchronized)
	if ($this->ready) {
	$this->_read_folder_data();

	$sql_result = $this->db->query(
	"SELECT COUNT(*) AS numrows FROM $this->cache_table ".
	"WHERE folder_id=? " . $this->_sql_where($query),
	$this->folder_id
	);

	if ($this->db->is_error($sql_result)) {
	return null;
	}

	$sql_arr = $this->db->fetch_assoc($sql_result);
	$count = intval($sql_arr['numrows']);
	}
	// use IMAP
	else {
	$filter = $this->_query2assoc($query);

	if ($filter['type']) {
	$search = 'UNDELETED HEADER X-Kolab-Type ' . kolab_format::KTYPE_PREFIX . $filter['type'];
	$index = $this->imap->search_once($this->folder->name, $search);
	}
	else {
	$index = $this->imap->index($this->folder->name, null, null, true, true);
	}

	if ($index->is_error()) {
	return null;
	}

	// TODO: post-filter result according to query

	$count = $index->count();
	}

	return $count;
	}

	/**
	* Define ORDER BY clause for cache queries
	*/
	public function set_order_by($sortcols)
	{
	if (!empty($sortcols)) {
	$this->order_by = join(', ', (array)$sortcols);
	}
	else {
	$this->order_by = null;
	}
	}

	/**
	* Define LIMIT clause for cache queries
	*/
	public function set_limit($length, $offset = 0)
	{
	$this->limit = array($length, $offset);
	}

	/**
	* Helper method to compose a valid SQL query from pseudo filter triplets
	*/
	protected function _sql_where($query)
	{
	$sql_where = '';
	foreach ((array) $query as $param) {
	if (is_array($param[0])) {
	$subq = array();
	foreach ($param[0] as $q) {
	$subq[] = preg_replace('/^\s*AND\s+/i', '', $this->_sql_where(array($q)));
	}
	if (!empty($subq)) {
	$sql_where .= ' AND (' . implode($param[1] == 'OR' ? ' OR ' : ' AND ', $subq) . ')';
	}
	continue;
	}
	else if ($param[1] == '=' && is_array($param[2])) {
	$qvalue = '(' . join(',', array_map(array($this->db, 'quote'), $param[2])) . ')';
	$param[1] = 'IN';
	}
	else if ($param[1] == '~' \|\| $param[1] == 'LIKE' \|\| $param[1] == '!~' \|\| $param[1] == '!LIKE') {
	$not = ($param[1] == '!~' \|\| $param[1] == '!LIKE') ? 'NOT ' : '';
	$param[1] = $not . 'LIKE';
	$qvalue = $this->db->quote('%'.preg_replace('/(^\^\|\$$)/', ' ', $param[2]).'%');
	}
	else if ($param[0] == 'tags') {
	$param[1] = 'LIKE';
	$qvalue = $this->db->quote('% '.$param[2].' %');
	}
	else {
	$qvalue = $this->db->quote($param[2]);
	}

	$sql_where .= sprintf(' AND %s %s %s',
	$this->db->quote_identifier($param[0]),
	$param[1],
	$qvalue
	);
	}

	return $sql_where;
	}

	/**
	* Helper method to convert the given pseudo-query triplets into
	* an associative filter array with 'equals' values only
	*/
	protected function _query2assoc($query)
	{
	// extract object type from query parameter
	$filter = array();
	foreach ($query as $param) {
	if ($param[1] == '=')
	$filter[$param[0]] = $param[2];
	}
	return $filter;
	}

	/**
	* Fetch messages from IMAP
	*
	* @param array List of message UIDs to fetch
	* @param string Requested object type or * for all
	* @param string IMAP folder to read from
	* @return array List of parsed Kolab objects
	*/
	protected function _fetch($index, $type = null, $folder = null)
	{
	$results = new kolab_storage_dataset($this);
	foreach ((array)$index as $msguid) {
	if ($object = $this->folder->read_object($msguid, $type, $folder)) {
	$results[] = $object;
	$this->set($msguid, $object);
	}
	}

	return $results;
	}

	/**
	* Helper method to convert the given Kolab object into a dataset to be written to cache
	*/
	protected function _serialize($object)
	{
	$sql_data = array('changed' => null, 'xml' => '', 'tags' => '', 'words' => '');

	if ($object['changed']) {
	$sql_data['changed'] = date('Y-m-d H:i:s', is_object($object['changed']) ? $object['changed']->format('U') : $object['changed']);
	}

	if ($object['_formatobj']) {
	$sql_data['xml'] = preg_replace('!(</?[a-z0-9:-]+>)[\n\r\t\s]+!ms', '$1', (string)$object['_formatobj']->write(3.0));
	$sql_data['tags'] = ' ' . join(' ', $object['_formatobj']->get_tags()) . ' '; // pad with spaces for strict/prefix search
	$sql_data['words'] = ' ' . join(' ', $object['_formatobj']->get_words()) . ' ';
	}

	// extract object data
	$data = array();
	foreach ($object as $key => $val) {
	// skip empty properties
	if ($val === "" \|\| $val === null) {
	continue;
	}
	// mark binary data to be extracted from xml on unserialize()
	if (isset($this->binary_items[$key])) {
	$data[$key] = true;
	}
	else if ($key[0] != '_') {
	$data[$key] = $val;
	}
	else if ($key == '_attachments') {
	foreach ($val as $k => $att) {
	unset($att['content'], $att['path']);
	if ($att['id'])
	$data[$key][$k] = $att;
	}
	}
	}

	// use base64 encoding (Bug #1912, #2662)
	$sql_data['data'] = base64_encode(serialize($data));

	return $sql_data;
	}

	/**
	* Helper method to turn stored cache data into a valid storage object
	*/
	protected function _unserialize($sql_arr)
	{
	// check if data is a base64-encoded string, for backward compat.
	if (strpos(substr($sql_arr['data'], 0, 64), ':') === false) {
	$sql_arr['data'] = base64_decode($sql_arr['data']);
	}

	$object = unserialize($sql_arr['data']);

	// de-serialization failed
	if ($object === false) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "Malformed data for {$this->resource_uri}/{$sql_arr['msguid']} object."
	), true);

	return null;
	}

	// decode binary properties
	foreach ($this->binary_items as $key => $regexp) {
	if (!empty($object[$key]) && preg_match($regexp, $sql_arr['xml'], $m)) {
	$object[$key] = base64_decode($m[1]);
	}
	}

	// add meta data
	$object['_type'] = $sql_arr['type'] ?: $this->folder->type;
	$object['_msguid'] = $sql_arr['msguid'];
	$object['_mailbox'] = $this->folder->name;
	$object['_size'] = strlen($sql_arr['xml']);
	$object['_formatobj'] = kolab_format::factory($object['_type'], 3.0, $sql_arr['xml']);

	return $object;
	}

	/**
	* Write records into cache using extended inserts to reduce the number of queries to be executed
	*
	* @param int Message UID. Set 0 to commit buffered inserts
	* @param array Kolab object to cache
	*/
	protected function _extended_insert($msguid, $object)
	{
	static $buffer = '';

	$line = '';
	if ($object) {
	$sql_data = $this->_serialize($object);
	$values = array(
	$this->db->quote($this->folder_id),
	$this->db->quote($msguid),
	$this->db->quote($object['uid']),
	$this->db->now(),
	$this->db->quote($sql_data['changed']),
	$this->db->quote($sql_data['data']),
	$this->db->quote($sql_data['xml']),
	$this->db->quote($sql_data['tags']),
	$this->db->quote($sql_data['words']),
	);
	foreach ($this->extra_cols as $col) {
	$values[] = $this->db->quote($sql_data[$col]);
	}
	$line = '(' . join(',', $values) . ')';
	}

	if ($buffer && (!$msguid \|\| (strlen($buffer) + strlen($line) > $this->max_sql_packet()))) {
	$extra_cols = $this->extra_cols ? ', ' . join(', ', $this->extra_cols) : '';
	$result = $this->db->query(
	"INSERT INTO $this->cache_table ".
	" (folder_id, msguid, uid, created, changed, data, xml, tags, words $extra_cols)".
	" VALUES $buffer"
	);
	if (!$this->db->affected_rows($result)) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "Failed to write to kolab cache"
	), true);
	}

	$buffer = '';
	}

	$buffer .= ($buffer ? ',' : '') . $line;
	}

	/**
	* Returns max_allowed_packet from mysql config
	*/
	protected function max_sql_packet()
	{
	if (!$this->max_sql_packet) {
	// mysql limit or max 4 MB
	$value = $this->db->get_variable('max_allowed_packet', 1048500);
	$this->max_sql_packet = min($value, 410241024) - 2000;
	}

	return $this->max_sql_packet;
	}

	/**
	* Read this folder's ID and cache metadata
	*/
	protected function _read_folder_data()
	{
	// already done
	if (!empty($this->folder_id) \|\| !$this->ready)
	return;

	$sql_arr = $this->db->fetch_assoc($this->db->query("SELECT folder_id, synclock, ctag FROM $this->folders_table WHERE resource=?", $this->resource_uri));
	if ($sql_arr) {
	$this->metadata = $sql_arr;
	$this->folder_id = $sql_arr['folder_id'];
	}
	else {
	$this->db->query("INSERT INTO $this->folders_table (resource, type) VALUES (?, ?)", $this->resource_uri, $this->folder->type);
	$this->folder_id = $this->db->insert_id('kolab_folders');
	$this->metadata = array();
	}
	}

	/**
	* Check lock record for this folder and wait if locked or set lock
	*/
	protected function _sync_lock()
	{
	if (!$this->ready)
	return;

	$this->_read_folder_data();
	$sql_query = "SELECT synclock, ctag FROM $this->folders_table WHERE folder_id=?";

	// abort if database is not set-up
	if ($this->db->is_error()) {
	$this->ready = false;
	return;
	}

	$this->synclock = true;

	// wait if locked (expire locks after 10 minutes)
	while ($this->metadata && intval($this->metadata['synclock']) > 0 && $this->metadata['synclock'] + $this->max_sync_lock_time > time()) {
	usleep(500000);
	$this->metadata = $this->db->fetch_assoc($this->db->query($sql_query, $this->folder_id));
	}

	// set lock
	$this->db->query("UPDATE $this->folders_table SET synclock = ? WHERE folder_id = ?", time(), $this->folder_id);
	}

	/**
	* Remove lock for this folder
	*/
	public function _sync_unlock()
	{
	if (!$this->ready \|\| !$this->synclock)
	return;

	$this->db->query(
	"UPDATE $this->folders_table SET synclock = 0, ctag = ? WHERE folder_id = ?",
	$this->metadata['ctag'],
	$this->folder_id
	);

	$this->synclock = false;
	}

	/**
	* Resolve an object UID into an IMAP message UID
	*
	* @param string Kolab object UID
	* @param boolean Include deleted objects
	* @return int The resolved IMAP message UID
	*/
	public function uid2msguid($uid, $deleted = false)
	{
	if (!isset($this->uid2msg[$uid])) {
	// use IMAP SEARCH to get the right message
	$index = $this->imap->search_once($this->folder->name, ($deleted ? '' : 'UNDELETED ') .
	'HEADER SUBJECT ' . rcube_imap_generic::escape($uid));
	$results = $index->get();
	$this->uid2msg[$uid] = $results[0];
	}

	return $this->uid2msg[$uid];
	}

	/**
	* Getter for protected member variables
	*/
	public function __get($name)
	{
	if ($name == 'folder_id') {
	$this->_read_folder_data();
	}

	return $this->$name;
	}

	/**
	* Bypass Roundcube messages cache.
	* Roundcube cache duplicates information already stored in kolab_cache.
	*
	* @param bool $disable True disables, False enables messages cache
	*/
	public function bypass($disable = false)
	{
	// if kolab cache is disabled do nothing
	if (!$this->enabled) {
	return;
	}

	static $messages_cache, $cache_bypass;

	if ($messages_cache === null) {
	$rcmail = rcube::get_instance();
	$messages_cache = (bool) $rcmail->config->get('messages_cache');
	$cache_bypass = (int) $rcmail->config->get('kolab_messages_cache_bypass');
	}

	if ($messages_cache) {
	// handle recurrent (multilevel) bypass() calls
	if ($disable) {
	$this->cache_bypassed += 1;
	if ($this->cache_bypassed > 1) {
	return;
	}
	}
	else {
	$this->cache_bypassed -= 1;
	if ($this->cache_bypassed > 0) {
	return;
	}
	}

	switch ($cache_bypass) {
	case 2:
	// Disable messages cache completely
	$this->imap->set_messages_caching(!$disable);
	break;

	case 1:
	// We'll disable messages cache, but keep index cache.
	// Default mode is both (MODE_INDEX \| MODE_MESSAGE)
	$mode = rcube_imap_cache::MODE_INDEX;

	if (!$disable) {
	$mode \|= rcube_imap_cache::MODE_MESSAGE;
	}

	$this->imap->set_messages_caching(true, $mode);
	}
	}
	}

	}

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