gnu-social/classes/Memcached_DataObject.php
Alexei Sorokin 5bc1b8695e [DATABASE] Disable 'NULL' strings evaluation as SQL NULLs
Use $object->sqlValue('NULL') (identical to DataObject_Cast'ing) instead and
fix related issues like (email|sms)settings considering these NULLs as a
false positive for the E-Mail address still being set when it's been removed.

There could also be security implications to the now-disabled approach of
considering 'NULL' strings as SQL NULLs.
2019-11-02 12:21:43 +03:00

1000 lines
30 KiB
PHP

<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* @copyright 2008, 2009 StatusNet, Inc.
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
defined('GNUSOCIAL') || die();
class Memcached_DataObject extends Safe_DataObject
{
/**
* Wrapper for DB_DataObject's static lookup using memcached
* as backing instead of an in-process cache array.
*
* @param string $cls classname of object type to load
* @param mixed $k key field name, or value for primary key
* @param mixed $v key field value, or leave out for primary key lookup
* @return mixed Memcached_DataObject subtype or false
*/
public static function getClassKV($cls, $k, $v = null)
{
if (is_null($v)) {
$v = $k;
$keys = static::pkeyCols();
if (count($keys) > 1) {
// FIXME: maybe call pkeyGetClass() ourselves?
throw new Exception('Use pkeyGetClass() for compound primary keys');
}
$k = $keys[0];
}
$i = self::getcached($cls, $k, $v);
if ($i === false) { // false == cache miss
$i = new $cls;
$result = $i->get($k, $v);
if ($result) {
// Hit!
$i->encache();
} else {
// save the fact that no such row exists
$c = self::memcache();
if (!empty($c)) {
$ck = self::cachekey($cls, $k, $v);
$c->set($ck, null);
}
$i = false;
}
}
return $i;
}
/**
* Get multiple items from the database by key
*
* @param string $cls Class to fetch
* @param string $keyCol name of column for key
* @param array $keyVals key values to fetch
* @param boolean $skipNulls skip provided null values
*
* @return array Array of objects, in order
*/
public static function multiGetClass($cls, $keyCol, array $keyVals, $skipNulls = true)
{
$obj = new $cls;
// PHP compatible datatype for settype() below
$colType = $obj->columnType($keyCol);
if (!in_array($colType, array('integer', 'int'))) {
// This is because I'm afraid to escape strings incorrectly
// in the way we use them below in FIND_IN_SET for MariaDB
throw new ServerException('Cannot do multiGet on anything but integer columns');
}
if ($skipNulls) {
foreach ($keyVals as $key=>$val) {
if (is_null($val)) {
unset($keyVals[$key]);
}
}
}
$obj->whereAddIn($keyCol, $keyVals, $colType);
// Since we're inputting straight to a query: format and escape
foreach ($keyVals as $key=>$val) {
settype($val, $colType);
$keyVals[$key] = $obj->escape($val);
}
switch (common_config('db', 'type')) {
case 'pgsql':
// "position" will make sure we keep the desired order
$obj->orderBy(sprintf(
"position(',' || CAST(%s AS text) || ',' IN ',%s,')",
$keyCol,
implode(',', $keyVals)
));
break;
case 'mysql':
// "find_in_set" will make sure we keep the desired order
$obj->orderBy(sprintf(
"find_in_set(%s, '%s')",
$keyCol,
implode(',', $keyVals)
));
break;
default:
throw new ServerException('Unknown DB type selected.');
}
$obj->find();
return $obj;
}
/**
* Get multiple items from the database by key
*
* @param string $cls Class to fetch
* @param string $keyCol name of column for key
* @param array $keyVals key values to fetch
* @param boolean $otherCols Other columns to hold fixed
*
* @return array Array mapping $keyVals to objects, or null if not found
*/
public static function pivotGetClass($cls, $keyCol, array $keyVals, array $otherCols = [])
{
if (is_array($keyCol)) {
foreach ($keyVals as $keyVal) {
$result[implode(',', $keyVal)] = null;
}
} else {
$result = array_fill_keys($keyVals, null);
}
$toFetch = array();
foreach ($keyVals as $keyVal) {
if (is_array($keyCol)) {
$kv = array_combine($keyCol, $keyVal);
} else {
$kv = array($keyCol => $keyVal);
}
$kv = array_merge($otherCols, $kv);
$i = self::multicache($cls, $kv);
if ($i !== false) {
if (is_array($keyCol)) {
$result[implode(',', $keyVal)] = $i;
} else {
$result[$keyVal] = $i;
}
} elseif (!empty($keyVal)) {
$toFetch[] = $keyVal;
}
}
if (count($toFetch) > 0) {
$i = new $cls;
foreach ($otherCols as $otherKeyCol => $otherKeyVal) {
$i->$otherKeyCol = $otherKeyVal;
}
if (is_array($keyCol)) {
$i->whereAdd(self::_inMultiKey($i, $keyCol, $toFetch));
} else {
$i->whereAddIn($keyCol, $toFetch, $i->columnType($keyCol));
}
if ($i->find()) {
while ($i->fetch()) {
$copy = clone($i);
$copy->encache();
if (is_array($keyCol)) {
$vals = array();
foreach ($keyCol as $k) {
$vals[] = $i->$k;
}
$result[implode(',', $vals)] = $copy;
} else {
$result[$i->$keyCol] = $copy;
}
}
}
// Save state of DB misses
foreach ($toFetch as $keyVal) {
$r = null;
if (is_array($keyCol)) {
$r = $result[implode(',', $keyVal)];
} else {
$r = $result[$keyVal];
}
if (empty($r)) {
if (is_array($keyCol)) {
$kv = array_combine($keyCol, $keyVal);
} else {
$kv = array($keyCol => $keyVal);
}
$kv = array_merge($otherCols, $kv);
// save the fact that no such row exists
$c = self::memcache();
if (!empty($c)) {
$ck = self::multicacheKey($cls, $kv);
$c->set($ck, null);
}
}
}
}
return $result;
}
public static function _inMultiKey($i, $cols, $values)
{
$types = array();
foreach ($cols as $col) {
$types[$col] = $i->columnType($col);
}
$first = true;
$query = '';
foreach ($values as $value) {
if ($first) {
$query .= '( ';
$first = false;
} else {
$query .= ' OR ';
}
$query .= '( ';
$i = 0;
$firstc = true;
foreach ($cols as $col) {
if (!$firstc) {
$query .= ' AND ';
} else {
$firstc = false;
}
switch ($types[$col]) {
case 'string':
case 'datetime':
$query .= sprintf("%s = %s", $col, $i->_quote($value[$i]));
break;
default:
$query .= sprintf("%s = %s", $col, $value[$i]);
break;
}
}
$query .= ') ';
}
if (!$first) {
$query .= ' )';
}
return $query;
}
public static function pkeyColsClass($cls)
{
$i = new $cls;
$types = $i->keyTypes();
ksort($types);
$pkey = array();
foreach ($types as $key => $type) {
if ($type == 'K' || $type == 'N') {
$pkey[] = $key;
}
}
return $pkey;
}
public static function listFindClass($cls, $keyCol, array $keyVals)
{
$i = new $cls;
$i->whereAddIn($keyCol, $keyVals, $i->columnType($keyCol));
if (!$i->find()) {
throw new NoResultException($i);
}
return $i;
}
public static function listGetClass($cls, $keyCol, array $keyVals)
{
$pkeyMap = array_fill_keys($keyVals, array());
$result = array_fill_keys($keyVals, array());
$pkeyCols = static::pkeyCols();
$toFetch = array();
$allPkeys = array();
// We only cache keys -- not objects!
foreach ($keyVals as $keyVal) {
$l = self::cacheGet(sprintf('%s:list-ids:%s:%s', strtolower($cls), $keyCol, $keyVal));
if ($l !== false) {
$pkeyMap[$keyVal] = $l;
foreach ($l as $pkey) {
$allPkeys[] = $pkey;
}
} else {
$toFetch[] = $keyVal;
}
}
if (count($allPkeys) > 0) {
$keyResults = self::pivotGetClass($cls, $pkeyCols, $allPkeys);
foreach ($pkeyMap as $keyVal => $pkeyList) {
foreach ($pkeyList as $pkeyVal) {
$i = $keyResults[implode(',', $pkeyVal)];
if (!empty($i)) {
$result[$keyVal][] = $i;
}
}
}
}
if (count($toFetch) > 0) {
try {
$i = self::listFindClass($cls, $keyCol, $toFetch);
while ($i->fetch()) {
$copy = clone($i);
$copy->encache();
$result[$i->$keyCol][] = $copy;
$pkeyVal = array();
foreach ($pkeyCols as $pkeyCol) {
$pkeyVal[] = $i->$pkeyCol;
}
$pkeyMap[$i->$keyCol][] = $pkeyVal;
}
} catch (NoResultException $e) {
// no results found for our keyVals, so we leave them as empty arrays
}
foreach ($toFetch as $keyVal) {
self::cacheSet(
sprintf("%s:list-ids:%s:%s", strtolower($cls), $keyCol, $keyVal),
$pkeyMap[$keyVal]
);
}
}
return $result;
}
public function columnType($columnName)
{
$keys = $this->table();
if (!array_key_exists($columnName, $keys)) {
throw new Exception('Unknown key column ' . $columnName . ' in ' . join(',', array_keys($keys)));
}
$def = $keys[$columnName];
if ($def & DB_DATAOBJECT_INT) {
return 'integer';
} else {
return 'string';
}
}
/**
* @todo FIXME: Should this return false on lookup fail to match getKV?
*/
public static function pkeyGetClass($cls, array $kv)
{
$i = self::multicache($cls, $kv);
if ($i !== false) { // false == cache miss
return $i;
} else {
$i = new $cls;
foreach ($kv as $k => $v) {
if (is_null($v)) {
// XXX: possible SQL injection...? Don't
// pass keys from the browser, eh.
$i->whereAdd("$k is null");
} else {
$i->$k = $v;
}
}
if ($i->find(true)) {
$i->encache();
} else {
$i = null;
$c = self::memcache();
if (!empty($c)) {
$ck = self::multicacheKey($cls, $kv);
$c->set($ck, null);
}
}
return $i;
}
}
public function insert()
{
$result = parent::insert();
if ($result) {
$this->fixupTimestamps();
$this->encache(); // in case of cached negative lookups
}
return $result;
}
public function update($dataObject = false)
{
if (is_object($dataObject) && $dataObject instanceof Memcached_DataObject) {
$dataObject->decache(); # might be different keys
}
$result = parent::update($dataObject);
if ($result !== false) {
$this->fixupTimestamps();
$this->encache();
}
return $result;
}
public function delete($useWhere = false)
{
$this->decache(); # while we still have the values!
return parent::delete($useWhere);
}
public static function memcache()
{
return Cache::instance();
}
public static function cacheKey($cls, $k, $v)
{
if (is_object($cls) || is_object($k) || (is_object($v) && !($v instanceof DB_DataObject_Cast))) {
$e = new Exception();
common_log(LOG_ERR, __METHOD__ . ' object in param: ' .
str_replace("\n", " ", $e->getTraceAsString()));
}
$vstr = self::valueString($v);
return Cache::key(strtolower($cls).':'.$k.':'.$vstr);
}
public static function getcached($cls, $k, $v)
{
$c = self::memcache();
if (!$c) {
return false;
} else {
$obj = $c->get(self::cacheKey($cls, $k, $v));
if (0 == strcasecmp($cls, 'User')) {
// Special case for User
if (is_object($obj) && is_object($obj->id)) {
common_log(LOG_ERR, "User " . $obj->nickname . " was cached with User as ID; deleting");
$c->delete(self::cacheKey($cls, $k, $v));
return false;
}
}
return $obj;
}
}
public function keyTypes()
{
// ini-based classes return number-indexed arrays. handbuilt
// classes return column => keytype. Make this uniform.
$keys = $this->keys();
$keyskeys = array_keys($keys);
if (is_string($keyskeys[0])) {
return $keys;
}
global $_DB_DATAOBJECT;
if (!isset($_DB_DATAOBJECT['INI'][$this->_database][$this->tableName()."__keys"])) {
$this->databaseStructure();
}
return $_DB_DATAOBJECT['INI'][$this->_database][$this->tableName()."__keys"];
}
public function encache()
{
$c = self::memcache();
if (!$c) {
return false;
} elseif ($this->tableName() === 'user' && is_object($this->id)) {
// Special case for User bug
$e = new Exception();
common_log(LOG_ERR, __METHOD__ . ' caching user with User object as ID ' .
str_replace("\n", " ", $e->getTraceAsString()));
return false;
} else {
$keys = $this->_allCacheKeys();
foreach ($keys as $key) {
$c->set($key, $this);
}
}
}
public function decache()
{
$c = self::memcache();
if (!$c) {
return false;
}
$keys = $this->_allCacheKeys();
foreach ($keys as $key) {
$c->delete($key, $this);
}
}
public function _allCacheKeys()
{
$ckeys = array();
$types = $this->keyTypes();
ksort($types);
$pkey = array();
$pval = array();
foreach ($types as $key => $type) {
assert(!empty($key));
if ($type == 'U') {
if (empty($this->$key)) {
continue;
}
$ckeys[] = self::cacheKey($this->tableName(), $key, self::valueString($this->$key));
} elseif (in_array($type, ['K', 'N'])) {
$pkey[] = $key;
$pval[] = self::valueString($this->$key);
} else {
// Low level exception. No need for i18n as discussed with Brion.
throw new Exception("Unknown key type $key => $type for " . $this->tableName());
}
}
assert(count($pkey) > 0);
// XXX: should work for both compound and scalar pkeys
$pvals = implode(',', $pval);
$pkeys = implode(',', $pkey);
$ckeys[] = self::cacheKey($this->tableName(), $pkeys, $pvals);
return $ckeys;
}
public static function multicache($cls, $kv)
{
ksort($kv);
$c = self::memcache();
if (!$c) {
return false;
} else {
return $c->get(self::multicacheKey($cls, $kv));
}
}
public static function multicacheKey($cls, $kv)
{
ksort($kv);
$pkeys = implode(',', array_keys($kv));
$pvals = implode(',', array_values($kv));
return self::cacheKey($cls, $pkeys, $pvals);
}
public function getSearchEngine($table)
{
require_once INSTALLDIR . '/lib/search/search_engines.php';
if (Event::handle('GetSearchEngine', [$this, $table, &$search_engine])) {
$type = common_config('search', 'type');
if ($type === 'like') {
$search_engine = new SQLLikeSearch($this, $table);
} elseif ($type === 'fulltext') {
switch (common_config('db', 'type')) {
case 'pgsql':
$search_engine = new PostgreSQLSearch($this, $table);
break;
case 'mysql':
$search_engine = new MySQLSearch($this, $table);
break;
default:
throw new ServerException('Unknown DB type selected.');
}
} else {
// Low level exception. No need for i18n as discussed with Brion.
throw new ServerException('Unknown search type: ' . $type);
}
}
return $search_engine;
}
public static function cachedQuery($cls, $qry, $expiry = 3600)
{
$c = self::memcache();
if (!$c) {
$inst = new $cls();
$inst->query($qry);
return $inst;
}
$key_part = Cache::keyize($cls).':'.md5($qry);
$ckey = Cache::key($key_part);
$stored = $c->get($ckey);
if ($stored !== false) {
return new ArrayWrapper($stored);
}
$inst = new $cls();
$inst->query($qry);
$cached = array();
while ($inst->fetch()) {
$cached[] = clone($inst);
}
$inst->free();
$c->set($ckey, $cached, Cache::COMPRESSED, $expiry);
return new ArrayWrapper($cached);
}
/**
* sends query to database - this is the private one that must work
* - internal functions use this rather than $this->query()
*
* Overridden to do logging.
*
* @param string $string
* @access private
* @return mixed none or PEAR_Error
*/
public function _query($string)
{
if (common_config('db', 'annotate_queries')) {
$string = $this->annotateQuery($string);
}
$start = microtime(true);
$fail = false;
$result = null;
if (Event::handle('StartDBQuery', array($this, $string, &$result))) {
common_perf_counter('query', $string);
try {
$result = parent::_query($string);
} catch (Exception $e) {
$fail = $e;
}
Event::handle('EndDBQuery', array($this, $string, &$result));
}
$delta = microtime(true) - $start;
$limit = common_config('db', 'log_slow_queries');
if (($limit > 0 && $delta >= $limit) || common_config('db', 'log_queries')) {
$clean = $this->sanitizeQuery($string);
if ($fail) {
$msg = sprintf("FAILED DB query (%0.3fs): %s - %s", $delta, $fail->getMessage(), $clean);
} else {
$msg = sprintf("DB query (%0.3fs): %s", $delta, $clean);
}
common_log(LOG_DEBUG, $msg);
}
if ($fail) {
throw $fail;
}
return $result;
}
/**
* Find the first caller in the stack trace that's not a
* low-level database function and add a comment to the
* query string. This should then be visible in process lists
* and slow query logs, to help identify problem areas.
*
* Also marks whether this was a web GET/POST or which daemon
* was running it.
*
* @param string $string SQL query string
* @return string SQL query string, with a comment in it
*/
public function annotateQuery($string)
{
$ignore = array('annotateQuery',
'_query',
'query',
'get',
'insert',
'delete',
'update',
'find');
$ignoreStatic = array('getKV',
'getClassKV',
'pkeyGet',
'pkeyGetClass',
'cachedQuery');
$here = get_class($this); // if we get confused
$bt = debug_backtrace();
// Find the first caller that's not us?
foreach ($bt as $frame) {
$func = $frame['function'];
if (isset($frame['type']) && $frame['type'] == '::') {
if (in_array($func, $ignoreStatic)) {
continue;
}
$here = $frame['class'] . '::' . $func;
break;
} elseif (isset($frame['type']) && $frame['type'] === '->') {
if ($frame['object'] === $this && in_array($func, $ignore)) {
continue;
}
if (in_array($func, $ignoreStatic)) {
continue; // @todo FIXME: This shouldn't be needed?
}
$here = get_class($frame['object']) . '->' . $func;
break;
}
$here = $func;
break;
}
if (php_sapi_name() == 'cli') {
$context = basename($_SERVER['PHP_SELF']);
} else {
$context = $_SERVER['REQUEST_METHOD'];
}
// Slip the comment in after the first command,
// or DB_DataObject gets confused about handling inserts and such.
$parts = explode(' ', $string, 2);
$parts[0] .= " /* $context $here */";
return implode(' ', $parts);
}
// Sanitize a query for logging
// @fixme don't trim spaces in string literals
public function sanitizeQuery($string)
{
$string = preg_replace('/\s+/', ' ', $string);
$string = trim($string);
return $string;
}
// We overload so that 'SET NAMES "utf8mb4"' is called for
// each connection
public function _connect()
{
global $_DB_DATAOBJECT, $_PEAR;
$sum = $this->_getDbDsnMD5();
if (!empty($_DB_DATAOBJECT['CONNECTIONS'][$sum]) &&
!$_PEAR->isError($_DB_DATAOBJECT['CONNECTIONS'][$sum])) {
$exists = true;
} else {
$exists = false;
}
// @fixme horrible evil hack!
//
// In multisite configuration we don't want to keep around a separate
// connection for every database; we could end up with thousands of
// connections open per thread. In an ideal world we might keep
// a connection per server and select different databases, but that'd
// be reliant on having the same db username/pass as well.
//
// MySQL connections are cheap enough we're going to try just
// closing out the old connection and reopening when we encounter
// a new DSN.
//
// WARNING WARNING if we end up actually using multiple DBs at a time
// we'll need some fancier logic here.
if (!$exists && !empty($_DB_DATAOBJECT['CONNECTIONS']) && php_sapi_name() == 'cli') {
foreach ($_DB_DATAOBJECT['CONNECTIONS'] as $index => $conn) {
if ($_PEAR->isError($conn)) {
common_log(LOG_WARNING, __METHOD__ . " cannot disconnect failed DB connection: '".$conn->getMessage()."'.");
} elseif (!empty($conn)) {
$conn->disconnect();
}
unset($_DB_DATAOBJECT['CONNECTIONS'][$index]);
}
}
$result = parent::_connect();
if ($result && !$exists) {
$DB = &$_DB_DATAOBJECT['CONNECTIONS'][$this->_database_dsn_md5];
if (common_config('db', 'type') == 'mysql' &&
common_config('db', 'utf8')) {
$conn = $DB->connection;
if (!empty($conn)) {
if ($DB instanceof DB_mysqli || $DB instanceof MDB2_Driver_mysqli) {
mysqli_set_charset($conn, 'utf8mb4');
} elseif ($DB instanceof DB_mysql || $DB instanceof MDB2_Driver_mysql) {
mysql_set_charset('utf8mb4', $conn);
}
}
}
// Needed to make timestamp values usefully comparable.
if (common_config('db', 'type') == 'mysql') {
parent::_query("set time_zone='+0:00'");
}
}
return $result;
}
// XXX: largely cadged from DB_DataObject
public function _getDbDsnMD5()
{
if ($this->_database_dsn_md5) {
return $this->_database_dsn_md5;
}
$dsn = $this->_getDbDsn();
if (is_string($dsn)) {
$sum = md5($dsn);
} else {
/// support array based dsn's
$sum = md5(serialize($dsn));
}
return $sum;
}
public function _getDbDsn()
{
global $_DB_DATAOBJECT;
if (empty($_DB_DATAOBJECT['CONFIG'])) {
self::_loadConfig();
}
$options = &$_DB_DATAOBJECT['CONFIG'];
// if the databse dsn dis defined in the object..
$dsn = isset($this->_database_dsn) ? $this->_database_dsn : null;
if (!$dsn) {
if (!$this->_database) {
$this->_database = isset($options["table_{$this->tableName()}"]) ? $options["table_{$this->tableName()}"] : null;
}
if ($this->_database && !empty($options["database_{$this->_database}"])) {
$dsn = $options["database_{$this->_database}"];
} elseif (!empty($options['database'])) {
$dsn = $options['database'];
}
}
if (!$dsn) {
// TRANS: Exception thrown when database name or Data Source Name could not be found.
throw new Exception(_('No database name or DSN found anywhere.'));
}
return $dsn;
}
public static function blow()
{
$c = self::memcache();
if (empty($c)) {
return false;
}
$args = func_get_args();
$format = array_shift($args);
$keyPart = vsprintf($format, $args);
$cacheKey = Cache::key($keyPart);
return $c->delete($cacheKey);
}
public function fixupTimestamps()
{
// Fake up timestamp columns
$columns = $this->table();
foreach ($columns as $name => $type) {
if ($type & DB_DATAOBJECT_MYSQLTIMESTAMP) {
$this->$name = common_sql_now();
}
}
}
public function debugDump()
{
common_debug("debugDump: " . common_log_objstring($this));
}
public function raiseError($message, $type = null, $behavior = null)
{
$id = get_class($this);
if (!empty($this->id)) {
$id .= ':' . $this->id;
}
if ($message instanceof PEAR_Error) {
$message = $message->getMessage();
}
// Low level exception. No need for i18n as discussed with Brion.
throw new ServerException("[$id] DB_DataObject error [$type]: $message");
}
public static function cacheGet($keyPart)
{
$c = self::memcache();
if (empty($c)) {
return false;
}
$cacheKey = Cache::key($keyPart);
return $c->get($cacheKey);
}
public static function cacheSet($keyPart, $value, $flag = null, $expiry = null)
{
$c = self::memcache();
if (empty($c)) {
return false;
}
$cacheKey = Cache::key($keyPart);
return $c->set($cacheKey, $value, $flag, $expiry);
}
public static function valueString($v)
{
$vstr = null;
if (is_object($v) && $v instanceof DB_DataObject_Cast) {
switch ($v->type) {
case 'date':
$vstr = "{$v->year} - {$v->month} - {$v->day}";
break;
case 'sql':
if (strcasecmp($v->value, 'NULL') == 0) {
// Very selectively handling NULLs.
$vstr = '';
break;
}
// fallthrough
case 'blob':
case 'string':
case 'datetime':
case 'time':
// Low level exception. No need for i18n as discussed with Brion.
throw new ServerException("Unhandled DB_DataObject_Cast type passed as cacheKey value: '$v->type'");
break;
default:
// Low level exception. No need for i18n as discussed with Brion.
throw new ServerException("Unknown DB_DataObject_Cast type passed as cacheKey value: '$v->type'");
break;
}
} else {
$vstr = strval($v);
}
return $vstr;
}
}