kolab_storage_cache_mongodb.php
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kolab_storage_cache_mongodb.php
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	<?php

	/**
	* Kolab storage cache class providing a local caching layer for Kolab groupware objects.
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2012, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	class kolab_storage_cache_mongodb
	{
	private $db;
	private $imap;
	private $folder;
	private $uid2msg;
	private $objects;
	private $index = array();
	private $resource_uri;
	private $enabled = true;
	private $synched = false;
	private $synclock = false;
	private $ready = false;
	private $max_sql_packet = 1046576; // 1 MB - 2000 bytes
	private $binary_cols = array('photo','pgppublickey','pkcs7publickey');


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

	if ($this->enabled) {
	// remove sync-lock on script termination
	$rcmail->add_shutdown_function(array($this, '_sync_unlock'));
	}

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


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

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

	// compose fully qualified ressource uri for this instance
	$this->resource_uri = $this->folder->get_resource_uri();
	$this->ready = $this->enabled;
	}


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

	// increase time limit
	@set_time_limit(500);

	// lock synchronization for this folder or wait if locked
	$this->_sync_lock();

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

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

	// determine objects to fetch or to invalidate
	if ($this->ready) {
	// read cache index
	$old_index = array();
	$cursor = $this->db->cache->find(array('resource' => $this->resource_uri), array('msguid' => 1, 'uid' => 1));
	foreach ($cursor as $doc) {
	$old_index[] = $doc['msguid'];
	$this->uid2msg[$doc['uid']] = $doc['msguid'];
	}

	// fetch new objects from imap
	foreach (array_diff($this->index, $old_index) as $msguid) {
	if ($object = $this->folder->read_object($msguid, '*')) {
	try {
	$this->db->cache->insert($this->_serialize($object, $msguid));
	}
	catch (Exception $e) {
	rcmail::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "Failed to write to mongodb cache: " . $e->getMessage(),
	), true);
	}
	}
	}

	// delete invalid entries from local DB
	$del_index = array_diff($old_index, $this->index);
	if (!empty($del_index)) {
	$this->db->cache->remove(array('resource' => $this->resource_uri, 'msguid' => array('$in' => $del_index)));
	}
	}

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

	$this->synched = time();
	}


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

	// load object if not in memory
	if (!isset($this->objects[$msguid])) {
	if ($this->ready && ($doc = $this->db->cache->findOne(array('resource' => $this->resource_uri, 'msguid' => $msguid))))
	$this->objects[$msguid] = $this->_unserialize($doc);

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

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


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

	// write to cache
	if ($this->ready) {
	// remove old entry
	$this->db->cache->remove(array('resource' => $this->resource_uri, 'msguid' => $msguid));

	// write new object data if not false (wich means deleted)
	if ($object) {
	try {
	$this->db->cache->insert($this->_serialize($object, $msguid));
	}
	catch (Exception $e) {
	rcmail::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "Failed to write to mongodb cache: " . $e->getMessage(),
	), true);
	}
	}
	}

	// keep a copy in memory for fast access
	$this->objects[$msguid] = $object;

	if ($object)
	$this->uid2msg[$object['uid']] = $msguid;
	}

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

	// resolve new message UID in target folder
	if ($new_msguid = $target->cache->uid2msguid($objuid)) {
	/*
	$this->db->query(
	"UPDATE kolab_cache SET resource=?, msguid=? ".
	"WHERE resource=? AND msguid=? AND type<>?",
	$target->get_resource_uri(),
	$new_msguid,
	$this->resource_uri,
	$msguid,
	'lock'
	);
	*/
	}
	else {
	// just clear cache entry
	$this->set($msguid, false);
	}

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


	/**
	* Remove all objects from local cache
	*/
	public function purge($type = null)
	{
	return $this->db->cache->remove(array(), array('safe' => true));
	}


	/**
	* Select Kolab objects filtered by the given query
	*
	* @param array Pseudo-SQL query as list of filter parameter triplets
	* triplet: array('<colname>', '<comparator>', '<value>')
	* @return array List of Kolab data objects (each represented as hash array)
	*/
	public function select($query = array())
	{
	$result = array();

	// read from local cache DB (assume it to be synchronized)
	if ($this->ready) {
	$cursor = $this->db->cache->find(array('resource' => $this->resource_uri) + $this->_mongo_filter($query));
	foreach ($cursor as $doc) {
	if ($object = $this->_unserialize($doc))
	$result[] = $object;
	}
	}
	else {
	// extract object type from query parameter
	$filter = $this->_query2assoc($query);

	// use 'list' for folder's default objects
	if ($filter['type'] == $this->type) {
	$index = $this->index;
	}
	else { // search by object type
	$search = 'UNDELETED HEADER X-Kolab-Type ' . kolab_storage_folder::KTYPE_PREFIX . $filter['type'];
	$index = $this->imap->search_once($this->folder->name, $search)->get();
	}

	// fetch all messages in $index from IMAP
	$result = $this->_fetch($index, $filter['type']);

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

	return $result;
	}


	/**
	* Get number of objects mathing the given query
	*
	* @param array $query Pseudo-SQL query as list of filter parameter triplets
	* @return integer The number of objects of the given type
	*/
	public function count($query = array())
	{
	$count = 0;

	// cache is in sync, we can count records in local DB
	if ($this->synched) {
	$cursor = $this->db->cache->find(array('resource' => $this->resource_uri) + $this->_mongo_filter($query));
	$count = $cursor->valid() ? $cursor->count() : 0;
	}
	else {
	// search IMAP by object type
	$filter = $this->_query2assoc($query);
	$ctype = kolab_storage_folder::KTYPE_PREFIX . $filter['type'];
	$index = $this->imap->search_once($this->folder->name, 'UNDELETED HEADER X-Kolab-Type ' . $ctype);
	$count = $index->count();
	}

	return $count;
	}

	/**
	* Helper method to convert the pseudo-SQL query into a valid mongodb filter
	*/
	private function _mongo_filter($query)
	{
	$filters = array();
	foreach ($query as $param) {
	$filter = array();
	if ($param[1] == '=' && is_array($param[2])) {
	$filter[$param[0]] = array('$in' => $param[2]);
	$filters[] = $filter;
	}
	else if ($param[1] == '=') {
	$filters[] = array($param[0] => $param[2]);
	}
	else if ($param[1] == 'LIKE' \|\| $param[1] == '~') {
	$filter[$param[0]] = array('$regex' => preg_quote($param[2]), '$options' => 'i');
	$filters[] = $filter;
	}
	else if ($param[1] == '!~' \|\| $param[1] == '!LIKE') {
	$filter[$param[0]] = array('$not' => '/' . preg_quote($param[2]) . '/i');
	$filters[] = $filter;
	}
	else {
	$op = '';
	switch ($param[1]) {
	case '>': $op = '$gt'; break;
	case '>=': $op = '$gte'; break;
	case '<': $op = '$lt'; break;
	case '<=': $op = '$lte'; break;
	case '!=':
	case '<>': $op = '$gte'; break;
	}
	if ($op) {
	$filter[$param[0]] = array($op => $param[2]);
	$filters[] = $filter;
	}
	}
	}

	return array('$and' => $filters);
	}

	/**
	* Helper method to convert the given pseudo-query triplets into
	* an associative filter array with 'equals' values only
	*/
	private 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
	* @return array List of parsed Kolab objects
	*/
	private function _fetch($index, $type = null, $folder = null)
	{
	$results = array();
	foreach ((array)$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
	*/
	private function _serialize($object, $msguid)
	{
	$bincols = array_flip($this->binary_cols);
	$doc = array(
	'resource' => $this->resource_uri,
	'type' => $object['_type'] ? $object['_type'] : $this->folder->type,
	'msguid' => $msguid,
	'uid' => $object['uid'],
	'xml' => '',
	'tags' => array(),
	'words' => array(),
	'objcols' => array(),
	);

	// set type specific values
	if ($this->folder->type == 'event') {
	// database runs in server's timezone so using date() is what we want
	$doc['dtstart'] = date('Y-m-d H:i:s', is_object($object['start']) ? $object['start']->format('U') : $object['start']);
	$doc['dtend'] = date('Y-m-d H:i:s', is_object($object['end']) ? $object['end']->format('U') : $object['end']);

	// extend date range for recurring events
	if ($object['recurrence']) {
	$doc['dtend'] = date('Y-m-d H:i:s', $object['recurrence']['UNTIL'] ?: strtotime('now + 2 years'));
	}
	}

	if ($object['_formatobj']) {
	$doc['xml'] = preg_replace('!(</?[a-z0-9:-]+>)[\n\r\t\s]+!ms', '$1', (string)$object['_formatobj']->write());
	$doc['tags'] = $object['_formatobj']->get_tags();
	$doc['words'] = $object['_formatobj']->get_words();
	}

	// extract object data
	$data = array();
	foreach ($object as $key => $val) {
	if ($val === "" \|\| $val === null) {
	// skip empty properties
	continue;
	}
	if (isset($bincols[$key])) {
	$data[$key] = base64_encode($val);
	}
	else if (is_object($val)) {
	if (is_a($val, 'DateTime')) {
	$data[$key] = array('_class' => 'DateTime', 'date' => $val->format('Y-m-d H:i:s'), 'timezone' => $val->getTimezone()->getName());
	$doc['objcols'][] = $key;
	}
	}
	else if ($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;
	}
	}
	}

	$doc['data'] = $data;
	return $doc;
	}

	/**
	* Helper method to turn stored cache data into a valid storage object
	*/
	private function _unserialize($doc)
	{
	$object = $doc['data'];

	// decode binary properties
	foreach ($this->binary_cols as $key) {
	if (!empty($object[$key]))
	$object[$key] = base64_decode($object[$key]);
	}

	// restore serialized objects
	foreach ((array)$doc['objcols'] as $key) {
	switch ($object[$key]['_class']) {
	case 'DateTime':
	$val = new DateTime($object[$key]['date'], new DateTimeZone($object[$key]['timezone']));
	$object[$key] = $val;
	break;
	}
	}

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

	return $object;
	}

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

	$this->synclock = true;
	$lock = $this->db->locks->findOne(array('resource' => $this->resource_uri));

	// create lock record if not exists
	if (!$lock) {
	$this->db->locks->insert(array('resource' => $this->resource_uri, 'created' => time()));
	}
	// wait if locked (expire locks after 10 minutes)
	else if ((time() - $lock['created']) < 600) {
	usleep(500000);
	return $this->_sync_lock();
	}
	// set lock
	else {
	$lock['created'] = time();
	$this->db->locks->update(array('_id' => $lock['_id']), $lock, array('safe' => true));
	}
	}

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

	$this->db->locks->remove(array('resource' => $this->resource_uri));
	}

	/**
	* 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 ' . $uid);
	$results = $index->get();
	$this->uid2msg[$uid] = $results[0];
	}

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

	}

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