785 lines
26 KiB
PHP
785 lines
26 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, 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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private $db;
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private $imap;
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private $folder;
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private $uid2msg;
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private $objects;
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private $index = array();
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private $resource_uri;
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private $enabled = true;
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private $synched = false;
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private $synclock = false;
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private $ready = false;
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private $max_sql_packet;
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private $max_sync_lock_time = 600;
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private $binary_items = array(
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'photo' => '|<photo><uri>[^;]+;base64,([^<]+)</uri></photo>|i',
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'pgppublickey' => '|<key><uri>date:application/pgp-keys;base64,([^<]+)</uri></photo>|i',
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'pkcs7publickey' => '|<key><uri>date:application/pkcs7-mime;base64,([^<]+)</uri></photo>|i',
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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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// 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->ready = $this->enabled;
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}
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/**
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* Synchronize local cache data with remote
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*/
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public function synchronize()
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{
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// only sync once per request cycle
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if ($this->synched)
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return;
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// increase time limit
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@set_time_limit($this->max_sync_lock_time);
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// lock synchronization for this folder or wait if locked
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$this->_sync_lock();
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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);
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$this->index = $imap_index->get();
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// determine objects to fetch or to invalidate
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if ($this->ready) {
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// read cache index
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$sql_result = $this->db->query(
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"SELECT msguid, uid FROM kolab_cache WHERE resource=? AND type<>?",
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$this->resource_uri,
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'lock'
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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']] = $sql_arr['msguid'];
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}
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// fetch new objects from imap
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foreach (array_diff($this->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, $this->index);
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if (!empty($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 kolab_cache WHERE resource=? AND msguid IN ($quoted_ids)",
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$this->resource_uri
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);
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}
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}
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// remove lock
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$this->_sync_unlock();
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$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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$sql_result = $this->db->query(
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"SELECT * FROM kolab_cache ".
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"WHERE resource=? AND type=? AND msguid=?",
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$this->resource_uri,
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$type ?: $this->folder->type,
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$msguid
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);
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if ($sql_arr = $this->db->fetch_assoc($sql_result)) {
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$this->objects[$msguid] = $this->_unserialize($sql_arr);
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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[$msguid] = $result[0];
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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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$this->db->query("DELETE FROM kolab_cache WHERE resource=? AND msguid=? AND type<>?",
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$this->resource_uri, $msguid, 'lock');
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}
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if ($object) {
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// insert new object data...
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$this->insert($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] = $object;
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}
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}
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/**
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* Insert a cache entry
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*
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* @param string Related IMAP message UID
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* @param mixed Hash array with object properties to save or false to delete the cache entry
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*/
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public function insert($msguid, $object)
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{
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// write to cache
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if ($this->ready) {
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$sql_data = $this->_serialize($object);
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$objtype = $object['_type'] ? $object['_type'] : $this->folder->type;
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$result = $this->db->query(
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"INSERT INTO kolab_cache ".
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" (resource, type, msguid, uid, created, changed, data, xml, dtstart, dtend, tags, words, filename)".
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" VALUES (?, ?, ?, ?, " . $this->db->now() . ", ?, ?, ?, ?, ?, ?, ?, ?)",
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$this->resource_uri,
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$objtype,
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$msguid,
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$object['uid'],
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$sql_data['changed'],
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$sql_data['data'],
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$sql_data['xml'],
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$sql_data['dtstart'],
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$sql_data['dtend'],
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$sql_data['tags'],
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$sql_data['words'],
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$sql_data['filename']
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);
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if (!$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[$msguid] = $object;
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$this->uid2msg[$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, $target_folder)
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{
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$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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$this->db->query(
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"UPDATE kolab_cache SET resource=?, msguid=? ".
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"WHERE resource=? AND msguid=? AND type<>?",
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$target->get_resource_uri(),
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$new_msguid,
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$this->resource_uri,
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$msguid,
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'lock'
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);
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}
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else {
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// just clear cache entry
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$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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$result = $this->db->query(
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"DELETE FROM kolab_cache WHERE resource=?".
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($type ? ' AND type=?' : ''),
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$this->resource_uri,
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$type
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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($new_folder)
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{
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$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 kolab_cache 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 = array();
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// read from local cache DB (assume it to be synchronized)
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if ($this->ready) {
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$sql_result = $this->db->query(
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"SELECT " . ($uids ? 'msguid, uid' : '*') . " FROM kolab_cache ".
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"WHERE resource=? " . $this->_sql_where($query),
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$this->resource_uri
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);
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while ($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[] = $sql_arr['uid'];
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}
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else if ($object = $this->_unserialize($sql_arr)) {
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$result[] = $object;
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}
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}
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}
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else {
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// extract object type from query parameter
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$filter = $this->_query2assoc($query);
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// use 'list' for folder's default objects
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if ($filter['type'] == $this->type) {
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$index = $this->index;
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}
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else { // search by object type
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$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)->get();
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}
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// fetch all messages in $index from IMAP
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$result = $uids ? $this->_fetch_uids($index, $filter['type']) : $this->_fetch($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[$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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$count = 0;
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// cache is in sync, we can count records in local DB
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if ($this->synched) {
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$sql_result = $this->db->query(
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"SELECT COUNT(*) AS numrows FROM kolab_cache ".
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"WHERE resource=? " . $this->_sql_where($query),
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$this->resource_uri
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);
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$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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else {
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// search IMAP by object type
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$filter = $this->_query2assoc($query);
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$ctype = kolab_format::KTYPE_PREFIX . $filter['type'];
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$index = $this->imap->search_once($this->folder->name, 'UNDELETED HEADER X-Kolab-Type ' . $ctype);
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$count = $index->count();
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}
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return $count;
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}
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/**
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* Helper method to compose a valid SQL query from pseudo filter triplets
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*/
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private function _sql_where($query)
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{
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$sql_where = '';
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foreach ($query as $param) {
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if (is_array($param[0])) {
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$subq = array();
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foreach ($param[0] as $q) {
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$subq[] = preg_replace('/^\s*AND\s+/i', '', $this->_sql_where(array($q)));
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}
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if (!empty($subq)) {
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$sql_where .= ' AND (' . implode($param[1] == 'OR' ? ' OR ' : ' AND ', $subq) . ')';
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}
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continue;
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}
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else if ($param[1] == '=' && is_array($param[2])) {
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$qvalue = '(' . join(',', array_map(array($this->db, 'quote'), $param[2])) . ')';
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$param[1] = 'IN';
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}
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else if ($param[1] == '~' || $param[1] == 'LIKE' || $param[1] == '!~' || $param[1] == '!LIKE') {
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$not = ($param[1] == '!~' || $param[1] == '!LIKE') ? 'NOT ' : '';
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$param[1] = $not . 'LIKE';
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$qvalue = $this->db->quote('%'.preg_replace('/(^\^|\$$)/', ' ', $param[2]).'%');
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}
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else if ($param[0] == 'tags') {
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$param[1] = 'LIKE';
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$qvalue = $this->db->quote('% '.$param[2].' %');
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}
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else {
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$qvalue = $this->db->quote($param[2]);
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}
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$sql_where .= sprintf(' AND %s %s %s',
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$this->db->quote_identifier($param[0]),
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$param[1],
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$qvalue
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);
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}
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return $sql_where;
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}
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/**
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* Helper method to convert the given pseudo-query triplets into
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* an associative filter array with 'equals' values only
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*/
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private function _query2assoc($query)
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{
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// extract object type from query parameter
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$filter = array();
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foreach ($query as $param) {
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if ($param[1] == '=')
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$filter[$param[0]] = $param[2];
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}
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return $filter;
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}
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/**
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* Fetch messages from IMAP
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*
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* @param array List of message UIDs to fetch
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* @param string Requested object type or * for all
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* @param string IMAP folder to read from
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* @return array List of parsed Kolab objects
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*/
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private function _fetch($index, $type = null, $folder = null)
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{
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$results = array();
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foreach ((array)$index as $msguid) {
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if ($object = $this->folder->read_object($msguid, $type, $folder)) {
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$results[] = $object;
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$this->set($msguid, $object);
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}
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}
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return $results;
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}
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/**
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* Fetch object UIDs (aka message subjects) from IMAP
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*
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* @param array List of message UIDs to fetch
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* @param string Requested object type or * for all
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* @param string IMAP folder to read from
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* @return array List of parsed Kolab objects
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*/
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private function _fetch_uids($index, $type = null)
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{
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if (!$type)
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$type = $this->folder->type;
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$results = array();
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foreach ((array)$this->imap->fetch_headers($this->folder->name, $index, false) as $msguid => $headers) {
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$object_type = kolab_format::mime2object_type($headers->others['x-kolab-type']);
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// check object type header and abort on mismatch
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if ($type != '*' && $object_type != $type)
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return false;
|
|
|
|
$uid = $headers->subject;
|
|
$this->uid2msg[$uid] = $msguid;
|
|
$results[] = $uid;
|
|
}
|
|
|
|
return $results;
|
|
}
|
|
|
|
|
|
/**
|
|
* Helper method to convert the given Kolab object into a dataset to be written to cache
|
|
*/
|
|
private function _serialize($object)
|
|
{
|
|
$sql_data = array('changed' => null, 'dtstart' => null, 'dtend' => null, 'xml' => '', 'tags' => '', 'words' => '');
|
|
$objtype = $object['_type'] ? $object['_type'] : $this->folder->type;
|
|
|
|
// set type specific values
|
|
if ($objtype == 'event') {
|
|
// database runs in server's timezone so using date() is what we want
|
|
$sql_data['dtstart'] = date('Y-m-d H:i:s', is_object($object['start']) ? $object['start']->format('U') : $object['start']);
|
|
$sql_data['dtend'] = date('Y-m-d H:i:s', is_object($object['end']) ? $object['end']->format('U') : $object['end']);
|
|
|
|
// extend date range for recurring events
|
|
if ($object['recurrence'] && $object['_formatobj']) {
|
|
$recurrence = new kolab_date_recurrence($object['_formatobj']);
|
|
$sql_data['dtend'] = date('Y-m-d 23:59:59', $recurrence->end() ?: strtotime('now +1 year'));
|
|
}
|
|
}
|
|
else if ($objtype == 'task') {
|
|
if ($object['start'])
|
|
$sql_data['dtstart'] = date('Y-m-d H:i:s', is_object($object['start']) ? $object['start']->format('U') : $object['start']);
|
|
if ($object['due'])
|
|
$sql_data['dtend'] = date('Y-m-d H:i:s', is_object($object['due']) ? $object['due']->format('U') : $object['due']);
|
|
}
|
|
else if ($objtype == 'file') {
|
|
if (!empty($object['_attachments'])) {
|
|
reset($object['_attachments']);
|
|
$sql_data['filename'] = $object['_attachments'][key($object['_attachments'])]['name'];
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
$sql_data['data'] = serialize($data);
|
|
return $sql_data;
|
|
}
|
|
|
|
/**
|
|
* Helper method to turn stored cache data into a valid storage object
|
|
*/
|
|
private function _unserialize($sql_arr)
|
|
{
|
|
$object = unserialize($sql_arr['data']);
|
|
|
|
// 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'];
|
|
$object['_msguid'] = $sql_arr['msguid'];
|
|
$object['_mailbox'] = $this->folder->name;
|
|
$object['_size'] = strlen($sql_arr['xml']);
|
|
$object['_formatobj'] = kolab_format::factory($sql_arr['type'], 3.0, $sql_arr['xml']);
|
|
|
|
return $object;
|
|
}
|
|
|
|
/**
|
|
* Write records into cache using extended inserts to reduce the number of queries to be executed
|
|
*
|
|
* @param int Message UID. Set 0 to commit buffered inserts
|
|
* @param array Kolab object to cache
|
|
*/
|
|
private function _extended_insert($msguid, $object)
|
|
{
|
|
static $buffer = '';
|
|
|
|
$line = '';
|
|
if ($object) {
|
|
$sql_data = $this->_serialize($object);
|
|
$objtype = $object['_type'] ? $object['_type'] : $this->folder->type;
|
|
|
|
$values = array(
|
|
$this->db->quote($this->resource_uri),
|
|
$this->db->quote($objtype),
|
|
$this->db->quote($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['dtstart']),
|
|
$this->db->quote($sql_data['dtend']),
|
|
$this->db->quote($sql_data['tags']),
|
|
$this->db->quote($sql_data['words']),
|
|
$this->db->quote($sql_data['filename']),
|
|
);
|
|
$line = '(' . join(',', $values) . ')';
|
|
}
|
|
|
|
if ($buffer && (!$msguid || (strlen($buffer) + strlen($line) > $this->max_sql_packet()))) {
|
|
$result = $this->db->query(
|
|
"INSERT INTO kolab_cache ".
|
|
" (resource, type, msguid, uid, created, changed, data, xml, dtstart, dtend, tags, words, filename)".
|
|
" 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 ? ',' : '') . $line;
|
|
}
|
|
|
|
/**
|
|
* Returns max_allowed_packet from mysql config
|
|
*/
|
|
private function max_sql_packet()
|
|
{
|
|
if (!$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 $this->max_sql_packet;
|
|
}
|
|
|
|
/**
|
|
* Check lock record for this folder and wait if locked or set lock
|
|
*/
|
|
private function _sync_lock()
|
|
{
|
|
if (!$this->ready)
|
|
return;
|
|
|
|
$sql_query = "SELECT msguid AS locked, ".$this->db->unixtimestamp('created')." AS created FROM kolab_cache ".
|
|
"WHERE resource=? AND type=?";
|
|
$sql_arr = $this->db->fetch_assoc($this->db->query($sql_query, $this->resource_uri, 'lock'));
|
|
|
|
// abort if database is not set-up
|
|
if ($this->db->is_error()) {
|
|
$this->ready = false;
|
|
return;
|
|
}
|
|
|
|
$this->synclock = true;
|
|
|
|
// wait if locked (expire locks after 10 minutes)
|
|
while ($sql_arr && intval($sql_arr['locked']) > 0 && $sql_arr['created'] + $this->max_sync_lock_time > time()) {
|
|
usleep(500000);
|
|
$sql_arr = $this->db->fetch_assoc($this->db->query($sql_query, $this->resource_uri, 'lock'));
|
|
}
|
|
|
|
// create lock record if not exists
|
|
if (!$sql_arr) {
|
|
$this->db->query(
|
|
"INSERT INTO kolab_cache (resource, type, msguid, created, uid, data, xml, tags, words)".
|
|
" VALUES (?, ?, 1, " . $this->db->now() . ", '', '', '', '', '')",
|
|
$this->resource_uri,
|
|
'lock'
|
|
);
|
|
}
|
|
else {
|
|
$this->db->query(
|
|
"UPDATE kolab_cache SET msguid = 1, created = " . $this->db->now() .
|
|
" WHERE resource = ? AND type = ?",
|
|
$this->resource_uri,
|
|
'lock'
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove lock for this folder
|
|
*/
|
|
public function _sync_unlock()
|
|
{
|
|
if (!$this->ready || !$this->synclock)
|
|
return;
|
|
|
|
$this->db->query(
|
|
"UPDATE kolab_cache SET msguid = 0 WHERE resource = ? AND type = ?",
|
|
$this->resource_uri,
|
|
'lock'
|
|
);
|
|
|
|
$this->synclock = false;
|
|
}
|
|
|
|
/**
|
|
* Resolve an object UID into an IMAP message UID
|
|
*
|
|
* @param string Kolab object UID
|
|
* @param boolean Include deleted objects
|
|
* @return int The resolved IMAP message UID
|
|
*/
|
|
public function uid2msguid($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];
|
|
}
|
|
|
|
}
|