2ade247a0c
to manage memory usage for large result sets (#2828). Attention! Do not cast the return value of kolab_storage_folder::select() calls into an array anymore.
942 lines
31 KiB
PHP
942 lines
31 KiB
PHP
<?php
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/**
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* Kolab storage cache class providing a local caching layer for Kolab groupware objects.
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*
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* @version @package_version@
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* @author Thomas Bruederli <bruederli@kolabsys.com>
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*
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* Copyright (C) 2012-2013, Kolab Systems AG <contact@kolabsys.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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class kolab_storage_cache
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{
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const DB_DATE_FORMAT = 'Y-m-d H:i:s';
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protected $db;
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protected $imap;
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protected $folder;
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protected $uid2msg;
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protected $objects;
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protected $metadata = array();
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protected $folder_id;
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protected $resource_uri;
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protected $enabled = true;
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protected $synched = false;
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protected $synclock = false;
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protected $ready = false;
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protected $cache_table;
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protected $folders_table;
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protected $max_sql_packet;
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protected $max_sync_lock_time = 600;
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protected $binary_items = array();
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protected $extra_cols = array();
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/**
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* Factory constructor
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*/
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public static function factory(kolab_storage_folder $storage_folder)
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{
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$subclass = 'kolab_storage_cache_' . $storage_folder->type;
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if (class_exists($subclass)) {
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return new $subclass($storage_folder);
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}
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else {
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rcube::raise_error(array(
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'code' => 900,
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'type' => 'php',
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'message' => "No kolab_storage_cache class found for folder '$storage_folder->name' of type '$storage_folder->type'"
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), true);
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return new kolab_storage_cache($storage_folder);
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}
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}
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/**
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* Default constructor
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*/
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public function __construct(kolab_storage_folder $storage_folder = null)
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{
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$rcmail = rcube::get_instance();
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$this->db = $rcmail->get_dbh();
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$this->imap = $rcmail->get_storage();
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$this->enabled = $rcmail->config->get('kolab_cache', false);
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if ($this->enabled) {
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// always read folder cache and lock state from DB master
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$this->db->set_table_dsn('kolab_folders', 'w');
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// remove sync-lock on script termination
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$rcmail->add_shutdown_function(array($this, '_sync_unlock'));
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}
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if ($storage_folder)
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$this->set_folder($storage_folder);
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}
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/**
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* Connect cache with a storage folder
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*
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* @param kolab_storage_folder The storage folder instance to connect with
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*/
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public function set_folder(kolab_storage_folder $storage_folder)
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{
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$this->folder = $storage_folder;
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if (empty($this->folder->name)) {
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$this->ready = false;
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return;
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}
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// compose fully qualified ressource uri for this instance
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$this->resource_uri = $this->folder->get_resource_uri();
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$this->folders_table = $this->db->table_name('kolab_folders');
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$this->cache_table = $this->db->table_name('kolab_cache_' . $this->folder->type);
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$this->ready = $this->enabled && !empty($this->folder->type);
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$this->folder_id = null;
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}
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/**
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* Returns true if this cache supports query by type
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*/
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public function has_type_col()
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{
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return in_array('type', $this->extra_cols);
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}
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/**
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* Getter for the numeric ID used in cache tables
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*/
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public function get_folder_id()
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{
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$this->_read_folder_data();
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return $this->folder_id;
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}
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/**
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* Synchronize local cache data with remote
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*/
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public function synchronize()
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{
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// only sync once per request cycle
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if ($this->synched)
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return;
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// increase time limit
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@set_time_limit($this->max_sync_lock_time);
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if (!$this->ready) {
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// kolab cache is disabled, synchronize IMAP mailbox cache only
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$this->imap->folder_sync($this->folder->name);
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}
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else {
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// read cached folder metadata
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$this->_read_folder_data();
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// check cache status hash first ($this->metadata is set in _read_folder_data())
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if ($this->metadata['ctag'] != $this->folder->get_ctag()) {
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// lock synchronization for this folder or wait if locked
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$this->_sync_lock();
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// disable messages cache if configured to do so
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$this->bypass(true);
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// synchronize IMAP mailbox cache
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$this->imap->folder_sync($this->folder->name);
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// compare IMAP index with object cache index
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$imap_index = $this->imap->index($this->folder->name, null, null, true, true);
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// determine objects to fetch or to invalidate
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if (!$imap_index->is_error()) {
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$imap_index = $imap_index->get();
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// read cache index
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$sql_result = $this->db->query(
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"SELECT msguid, uid FROM $this->cache_table WHERE folder_id=?",
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$this->folder_id
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);
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$old_index = array();
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while ($sql_arr = $this->db->fetch_assoc($sql_result)) {
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$old_index[] = $sql_arr['msguid'];
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$this->uid2msg[$sql_arr['uid']] = $sql_arr['msguid'];
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}
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// fetch new objects from imap
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foreach (array_diff($imap_index, $old_index) as $msguid) {
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if ($object = $this->folder->read_object($msguid, '*')) {
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$this->_extended_insert($msguid, $object);
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}
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}
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$this->_extended_insert(0, null);
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// delete invalid entries from local DB
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$del_index = array_diff($old_index, $imap_index);
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if (!empty($del_index)) {
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$quoted_ids = join(',', array_map(array($this->db, 'quote'), $del_index));
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$this->db->query(
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"DELETE FROM $this->cache_table WHERE folder_id=? AND msguid IN ($quoted_ids)",
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$this->folder_id
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);
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}
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// update ctag value (will be written to database in _sync_unlock())
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$this->metadata['ctag'] = $this->folder->get_ctag();
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}
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$this->bypass(false);
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// remove lock
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$this->_sync_unlock();
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}
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}
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$this->synched = time();
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}
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/**
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* Read a single entry from cache or from IMAP directly
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*
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* @param string Related IMAP message UID
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* @param string Object type to read
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* @param string IMAP folder name the entry relates to
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* @param array Hash array with object properties or null if not found
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*/
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public function get($msguid, $type = null, $foldername = null)
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{
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// delegate to another cache instance
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if ($foldername && $foldername != $this->folder->name) {
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return kolab_storage::get_folder($foldername)->cache->get($msguid, $type);
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}
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// load object if not in memory
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if (!isset($this->objects[$msguid])) {
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if ($this->ready) {
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$this->_read_folder_data();
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$sql_result = $this->db->query(
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"SELECT * FROM $this->cache_table ".
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"WHERE folder_id=? AND msguid=?",
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$this->folder_id,
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$msguid
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);
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if ($sql_arr = $this->db->fetch_assoc($sql_result)) {
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$this->objects = array($msguid => $this->_unserialize($sql_arr)); // store only this object in memory (#2827)
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}
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}
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// fetch from IMAP if not present in cache
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if (empty($this->objects[$msguid])) {
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$result = $this->_fetch(array($msguid), $type, $foldername);
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$this->objects = array($msguid => $result[0]); // store only this object in memory (#2827)
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}
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}
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return $this->objects[$msguid];
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}
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/**
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* Insert/Update a cache entry
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*
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* @param string Related IMAP message UID
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* @param mixed Hash array with object properties to save or false to delete the cache entry
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* @param string IMAP folder name the entry relates to
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*/
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public function set($msguid, $object, $foldername = null)
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{
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if (!$msguid) {
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return;
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}
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// delegate to another cache instance
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if ($foldername && $foldername != $this->folder->name) {
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kolab_storage::get_folder($foldername)->cache->set($msguid, $object);
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return;
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}
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// remove old entry
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if ($this->ready) {
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$this->_read_folder_data();
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$this->db->query("DELETE FROM $this->cache_table WHERE folder_id=? AND msguid=?",
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$this->folder_id, $msguid);
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}
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if ($object) {
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// insert new object data...
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$this->save($msguid, $object);
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}
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else {
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// ...or set in-memory cache to false
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$this->objects[$msguid] = $object;
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}
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}
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/**
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* Insert (or update) a cache entry
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*
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* @param int Related IMAP message UID
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* @param mixed Hash array with object properties to save or false to delete the cache entry
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* @param int Optional old message UID (for update)
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*/
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public function save($msguid, $object, $olduid)
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{
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// write to cache
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if ($this->ready) {
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$this->_read_folder_data();
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$sql_data = $this->_serialize($object);
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$sql_data['folder_id'] = $this->folder_id;
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$sql_data['msguid'] = $msguid;
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$sql_data['uid'] = $object['uid'];
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$args = array();
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$cols = array('folder_id', 'msguid', 'uid', 'changed', 'data', 'xml', 'tags', 'words');
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$cols = array_merge($cols, $this->extra_cols);
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foreach ($cols as $idx => $col) {
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$cols[$idx] = $this->db->quote_identifier($col);
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$args[] = $sql_data[$col];
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}
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if ($olduid) {
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foreach ($cols as $idx => $col) {
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$cols[$idx] = "$col = ?";
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}
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$query = "UPDATE $this->cache_table SET " . implode(', ', $cols)
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. " WHERE folder_id = ? AND msguid = ?";
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$args[] = $this->folder_id;
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$args[] = $olduid;
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}
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else {
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$query = "INSERT INTO $this->cache_table (created, " . implode(', ', $cols)
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. ") VALUES (" . $this->db->now() . str_repeat(', ?', count($cols)) . ")";
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}
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$result = $this->db->query($query, $args);
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if (!$this->db->affected_rows($result)) {
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rcube::raise_error(array(
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'code' => 900, 'type' => 'php',
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'message' => "Failed to write to kolab cache"
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), true);
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}
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}
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// keep a copy in memory for fast access
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$this->objects = array($msguid => $object);
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$this->uid2msg = array($object['uid'] => $msguid);
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}
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/**
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* Move an existing cache entry to a new resource
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*
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* @param string Entry's IMAP message UID
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* @param string Entry's Object UID
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* @param string Target IMAP folder to move it to
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*/
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public function move($msguid, $uid, $target_folder)
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{
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if ($this->ready) {
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$target = kolab_storage::get_folder($target_folder);
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// resolve new message UID in target folder
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if ($new_msguid = $target->cache->uid2msguid($uid)) {
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$this->_read_folder_data();
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$this->db->query(
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"UPDATE $this->cache_table SET folder_id=?, msguid=? ".
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"WHERE folder_id=? AND msguid=?",
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$target->cache->get_folder_id(),
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$new_msguid,
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$this->folder_id,
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$msguid
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);
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$result = $this->db->affected_rows();
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}
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}
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if (empty($result)) {
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// just clear cache entry
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$this->set($msguid, false);
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}
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unset($this->uid2msg[$uid]);
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}
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/**
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* Remove all objects from local cache
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*/
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public function purge($type = null)
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{
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if (!$this->ready) {
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return true;
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}
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$this->_read_folder_data();
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$result = $this->db->query(
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"DELETE FROM $this->cache_table WHERE folder_id=?",
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$this->folder_id
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);
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return $this->db->affected_rows($result);
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}
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/**
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* Update resource URI for existing cache entries
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*
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* @param string Target IMAP folder to move it to
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*/
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public function rename($new_folder)
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{
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if (!$this->ready) {
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return;
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}
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$target = kolab_storage::get_folder($new_folder);
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// resolve new message UID in target folder
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$this->db->query(
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"UPDATE $this->folders_table SET resource=? ".
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"WHERE resource=?",
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$target->get_resource_uri(),
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$this->resource_uri
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);
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}
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/**
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* Select Kolab objects filtered by the given query
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*
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* @param array Pseudo-SQL query as list of filter parameter triplets
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* triplet: array('<colname>', '<comparator>', '<value>')
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* @param boolean Set true to only return UIDs instead of complete objects
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* @return array List of Kolab data objects (each represented as hash array) or UIDs
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*/
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public function select($query = array(), $uids = false)
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{
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$result = $uids ? array() : new kolab_storage_dataset($this);
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// read from local cache DB (assume it to be synchronized)
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if ($this->ready) {
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$this->_read_folder_data();
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// fetch full object data on one query if a small result set is expected
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$fetchall = !$uids && $this->count($query) < 500;
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$sql_result = $this->db->query(
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"SELECT " . (!$fetchall ? 'msguid, msguid AS _msguid, uid' : '*') . " FROM $this->cache_table ".
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"WHERE folder_id=? " . $this->_sql_where($query),
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$this->folder_id
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);
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if ($this->db->is_error($sql_result)) {
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return null;
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}
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while ($sql_arr = $this->db->fetch_assoc($sql_result)) {
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if ($uids) {
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$this->uid2msg[$sql_arr['uid']] = $sql_arr['msguid'];
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$result[] = $sql_arr['uid'];
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}
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else if ($fetchall && ($object = $this->_unserialize($sql_arr))) {
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$result[] = $object;
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}
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else {
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// only add msguid to dataset index
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$result[] = $sql_arr;
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}
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}
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}
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// use IMAP
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else {
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$filter = $this->_query2assoc($query);
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if ($filter['type']) {
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$search = 'UNDELETED HEADER X-Kolab-Type ' . kolab_format::KTYPE_PREFIX . $filter['type'];
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$index = $this->imap->search_once($this->folder->name, $search);
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}
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else {
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$index = $this->imap->index($this->folder->name, null, null, true, true);
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}
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if ($index->is_error()) {
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return null;
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}
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$index = $index->get();
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$result = $uids ? $index : $this->_fetch($index, $filter['type']);
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// TODO: post-filter result according to query
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}
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// We don't want to cache big results in-memory, however
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// if we select only one object here, there's a big chance we will need it later
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if (!$uids && count($result) == 1) {
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if ($msguid = $result[0]['_msguid']) {
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$this->uid2msg[$result[0]['uid']] = $msguid;
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$this->objects = array($msguid => $result[0]);
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}
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}
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return $result;
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}
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/**
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* Get number of objects mathing the given query
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*
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* @param array $query Pseudo-SQL query as list of filter parameter triplets
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* @return integer The number of objects of the given type
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*/
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public function count($query = array())
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{
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// read from local cache DB (assume it to be synchronized)
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if ($this->ready) {
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$this->_read_folder_data();
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$sql_result = $this->db->query(
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"SELECT COUNT(*) AS numrows FROM $this->cache_table ".
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"WHERE folder_id=? " . $this->_sql_where($query),
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$this->folder_id
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);
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if ($this->db->is_error($sql_result)) {
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return null;
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}
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$sql_arr = $this->db->fetch_assoc($sql_result);
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$count = intval($sql_arr['numrows']);
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}
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// use IMAP
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else {
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$filter = $this->_query2assoc($query);
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if ($filter['type']) {
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$search = 'UNDELETED HEADER X-Kolab-Type ' . kolab_format::KTYPE_PREFIX . $filter['type'];
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|
$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 $count;
|
|
}
|
|
|
|
|
|
/**
|
|
* Helper method to compose a valid SQL query from pseudo filter triplets
|
|
*/
|
|
protected function _sql_where($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, 4*1024*1024) - 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);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|