533 lines
15 KiB
PHP
533 lines
15 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2008, 2009, StatusNet, Inc.
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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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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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if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
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class Memcached_DataObject extends DB_DataObject
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{
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/**
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* Destructor to free global memory resources associated with
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* this data object when it's unset or goes out of scope.
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* DB_DataObject doesn't do this yet by itself.
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*/
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function __destruct()
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{
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$this->free();
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if (method_exists('DB_DataObject', '__destruct')) {
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parent::__destruct();
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}
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}
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/**
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* Magic function called at serialize() time.
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*
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* We use this to drop a couple process-specific references
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* from DB_DataObject which can cause trouble in future
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* processes.
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*
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* @return array of variable names to include in serialization.
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*/
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function __sleep()
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{
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$vars = array_keys(get_object_vars($this));
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$skip = array('_DB_resultid', '_link_loaded');
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return array_diff($vars, $skip);
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}
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/**
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* Magic function called at unserialize() time.
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*
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* Clean out some process-specific variables which might
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* be floating around from a previous process's cached
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* objects.
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*
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* Old cached objects may still have them.
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*/
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function __wakeup()
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{
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// Refers to global state info from a previous process.
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// Clear this out so we don't accidentally break global
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// state in *this* process.
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$this->_DB_resultid = null;
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// We don't have any local DBO refs, so clear these out.
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$this->_link_loaded = false;
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}
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/**
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* Wrapper for DB_DataObject's static lookup using memcached
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* as backing instead of an in-process cache array.
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*
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* @param string $cls classname of object type to load
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* @param mixed $k key field name, or value for primary key
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* @param mixed $v key field value, or leave out for primary key lookup
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* @return mixed Memcached_DataObject subtype or false
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*/
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function &staticGet($cls, $k, $v=null)
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{
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if (is_null($v)) {
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$v = $k;
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# XXX: HACK!
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$i = new $cls;
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$keys = $i->keys();
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$k = $keys[0];
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unset($i);
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}
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$i = Memcached_DataObject::getcached($cls, $k, $v);
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if ($i === false) { // false == cache miss
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$i = DB_DataObject::factory($cls);
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if (empty($i)) {
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$i = false;
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return $i;
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}
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$result = $i->get($k, $v);
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if ($result) {
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// Hit!
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$i->encache();
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} else {
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// save the fact that no such row exists
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$c = self::memcache();
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if (!empty($c)) {
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$ck = self::cachekey($cls, $k, $v);
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$c->set($ck, null);
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}
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$i = false;
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}
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}
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return $i;
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}
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/**
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* @fixme Should this return false on lookup fail to match staticGet?
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*/
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function pkeyGet($cls, $kv)
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{
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$i = Memcached_DataObject::multicache($cls, $kv);
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if ($i !== false) { // false == cache miss
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return $i;
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} else {
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$i = DB_DataObject::factory($cls);
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if (empty($i)) {
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return false;
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}
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foreach ($kv as $k => $v) {
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$i->$k = $v;
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}
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if ($i->find(true)) {
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$i->encache();
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} else {
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$i = null;
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$c = self::memcache();
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if (!empty($c)) {
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$ck = self::multicacheKey($cls, $kv);
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$c->set($ck, null);
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}
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}
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return $i;
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}
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}
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function insert()
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{
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$result = parent::insert();
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if ($result) {
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$this->encache(); // in case of cached negative lookups
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}
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return $result;
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}
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function update($orig=null)
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{
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if (is_object($orig) && $orig instanceof Memcached_DataObject) {
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$orig->decache(); # might be different keys
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}
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$result = parent::update($orig);
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if ($result) {
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$this->encache();
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}
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return $result;
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}
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function delete()
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{
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$this->decache(); # while we still have the values!
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return parent::delete();
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}
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static function memcache() {
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return common_memcache();
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}
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static function cacheKey($cls, $k, $v) {
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if (is_object($cls) || is_object($k) || is_object($v)) {
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$e = new Exception();
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common_log(LOG_ERR, __METHOD__ . ' object in param: ' .
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str_replace("\n", " ", $e->getTraceAsString()));
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}
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return common_cache_key(strtolower($cls).':'.$k.':'.$v);
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}
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static function getcached($cls, $k, $v) {
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$c = Memcached_DataObject::memcache();
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if (!$c) {
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return false;
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} else {
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$obj = $c->get(Memcached_DataObject::cacheKey($cls, $k, $v));
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if (0 == strcasecmp($cls, 'User')) {
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// Special case for User
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if (is_object($obj) && is_object($obj->id)) {
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common_log(LOG_ERR, "User " . $obj->nickname . " was cached with User as ID; deleting");
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$c->delete(Memcached_DataObject::cacheKey($cls, $k, $v));
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return false;
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}
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}
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return $obj;
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}
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}
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function keyTypes()
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{
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// ini-based classes return number-indexed arrays. handbuilt
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// classes return column => keytype. Make this uniform.
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$keys = $this->keys();
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$keyskeys = array_keys($keys);
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if (is_string($keyskeys[0])) {
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return $keys;
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}
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global $_DB_DATAOBJECT;
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if (!isset($_DB_DATAOBJECT['INI'][$this->_database][$this->__table."__keys"])) {
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$this->databaseStructure();
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}
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return $_DB_DATAOBJECT['INI'][$this->_database][$this->__table."__keys"];
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}
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function encache()
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{
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$c = $this->memcache();
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if (!$c) {
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return false;
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} else if ($this->tableName() == 'user' && is_object($this->id)) {
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// Special case for User bug
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$e = new Exception();
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common_log(LOG_ERR, __METHOD__ . ' caching user with User object as ID ' .
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str_replace("\n", " ", $e->getTraceAsString()));
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return false;
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} else {
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$keys = $this->_allCacheKeys();
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foreach ($keys as $key) {
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$c->set($key, $this);
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}
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}
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}
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function decache()
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{
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$c = $this->memcache();
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if (!$c) {
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return false;
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}
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$keys = $this->_allCacheKeys();
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foreach ($keys as $key) {
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$c->delete($key, $this);
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}
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}
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function _allCacheKeys()
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{
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$ckeys = array();
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$types = $this->keyTypes();
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ksort($types);
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$pkey = array();
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$pval = array();
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foreach ($types as $key => $type) {
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assert(!empty($key));
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if ($type == 'U') {
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if (empty($this->$key)) {
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continue;
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}
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$ckeys[] = $this->cacheKey($this->tableName(), $key, $this->$key);
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} else if ($type == 'K' || $type == 'N') {
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$pkey[] = $key;
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$pval[] = $this->$key;
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} else {
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throw new Exception("Unknown key type $key => $type for " . $this->tableName());
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}
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}
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assert(count($pkey) > 0);
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// XXX: should work for both compound and scalar pkeys
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$pvals = implode(',', $pval);
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$pkeys = implode(',', $pkey);
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$ckeys[] = $this->cacheKey($this->tableName(), $pkeys, $pvals);
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return $ckeys;
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}
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function multicache($cls, $kv)
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{
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ksort($kv);
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$c = self::memcache();
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if (!$c) {
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return false;
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} else {
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return $c->get(self::multicacheKey($cls, $kv));
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}
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}
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static function multicacheKey($cls, $kv)
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{
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ksort($kv);
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$pkeys = implode(',', array_keys($kv));
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$pvals = implode(',', array_values($kv));
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return self::cacheKey($cls, $pkeys, $pvals);
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}
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function getSearchEngine($table)
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{
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require_once INSTALLDIR.'/lib/search_engines.php';
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static $search_engine;
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if (!isset($search_engine)) {
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if (Event::handle('GetSearchEngine', array($this, $table, &$search_engine))) {
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if ('mysql' === common_config('db', 'type')) {
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$type = common_config('search', 'type');
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if ($type == 'like') {
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$search_engine = new MySQLLikeSearch($this, $table);
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} else if ($type == 'fulltext') {
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$search_engine = new MySQLSearch($this, $table);
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} else {
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throw new ServerException('Unknown search type: ' . $type);
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}
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} else {
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$search_engine = new PGSearch($this, $table);
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}
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}
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}
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return $search_engine;
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}
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static function cachedQuery($cls, $qry, $expiry=3600)
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{
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$c = Memcached_DataObject::memcache();
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if (!$c) {
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$inst = new $cls();
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$inst->query($qry);
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return $inst;
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}
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$key_part = common_keyize($cls).':'.md5($qry);
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$ckey = common_cache_key($key_part);
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$stored = $c->get($ckey);
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if ($stored !== false) {
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return new ArrayWrapper($stored);
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}
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$inst = new $cls();
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$inst->query($qry);
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$cached = array();
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while ($inst->fetch()) {
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$cached[] = clone($inst);
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}
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$inst->free();
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$c->set($ckey, $cached, MEMCACHE_COMPRESSED, $expiry);
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return new ArrayWrapper($cached);
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}
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/**
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* sends query to database - this is the private one that must work
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* - internal functions use this rather than $this->query()
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*
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* Overridden to do logging.
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*
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* @param string $string
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* @access private
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* @return mixed none or PEAR_Error
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*/
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function _query($string)
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{
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$start = microtime(true);
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$result = parent::_query($string);
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$delta = microtime(true) - $start;
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$limit = common_config('db', 'log_slow_queries');
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if (($limit > 0 && $delta >= $limit) || common_config('db', 'log_queries')) {
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$clean = $this->sanitizeQuery($string);
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common_log(LOG_DEBUG, sprintf("DB query (%0.3fs): %s", $delta, $clean));
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}
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return $result;
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}
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// Sanitize a query for logging
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// @fixme don't trim spaces in string literals
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function sanitizeQuery($string)
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{
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$string = preg_replace('/\s+/', ' ', $string);
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$string = trim($string);
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return $string;
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}
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// We overload so that 'SET NAMES "utf8"' is called for
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// each connection
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function _connect()
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{
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global $_DB_DATAOBJECT;
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$sum = $this->_getDbDsnMD5();
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if (!empty($_DB_DATAOBJECT['CONNECTIONS'][$sum]) &&
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!PEAR::isError($_DB_DATAOBJECT['CONNECTIONS'][$sum])) {
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$exists = true;
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} else {
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$exists = false;
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}
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// @fixme horrible evil hack!
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//
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// In multisite configuration we don't want to keep around a separate
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// connection for every database; we could end up with thousands of
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// connections open per thread. In an ideal world we might keep
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// a connection per server and select different databases, but that'd
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// be reliant on having the same db username/pass as well.
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//
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// MySQL connections are cheap enough we're going to try just
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// closing out the old connection and reopening when we encounter
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// a new DSN.
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//
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// WARNING WARNING if we end up actually using multiple DBs at a time
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// we'll need some fancier logic here.
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if (!$exists && !empty($_DB_DATAOBJECT['CONNECTIONS'])) {
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foreach ($_DB_DATAOBJECT['CONNECTIONS'] as $index => $conn) {
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if (!empty($conn)) {
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$conn->disconnect();
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}
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unset($_DB_DATAOBJECT['CONNECTIONS'][$index]);
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}
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}
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$result = parent::_connect();
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if ($result && !$exists) {
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$DB = &$_DB_DATAOBJECT['CONNECTIONS'][$this->_database_dsn_md5];
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if (common_config('db', 'type') == 'mysql' &&
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common_config('db', 'utf8')) {
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$conn = $DB->connection;
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if (!empty($conn)) {
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if ($DB instanceof DB_mysqli) {
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mysqli_set_charset($conn, 'utf8');
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} else if ($DB instanceof DB_mysql) {
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mysql_set_charset('utf8', $conn);
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}
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}
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}
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}
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return $result;
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}
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// XXX: largely cadged from DB_DataObject
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function _getDbDsnMD5()
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{
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if ($this->_database_dsn_md5) {
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return $this->_database_dsn_md5;
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}
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$dsn = $this->_getDbDsn();
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if (is_string($dsn)) {
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$sum = md5($dsn);
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} else {
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/// support array based dsn's
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$sum = md5(serialize($dsn));
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}
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return $sum;
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}
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function _getDbDsn()
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{
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global $_DB_DATAOBJECT;
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if (empty($_DB_DATAOBJECT['CONFIG'])) {
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DB_DataObject::_loadConfig();
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}
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$options = &$_DB_DATAOBJECT['CONFIG'];
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// if the databse dsn dis defined in the object..
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$dsn = isset($this->_database_dsn) ? $this->_database_dsn : null;
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if (!$dsn) {
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if (!$this->_database) {
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$this->_database = isset($options["table_{$this->__table}"]) ? $options["table_{$this->__table}"] : null;
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}
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if ($this->_database && !empty($options["database_{$this->_database}"])) {
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$dsn = $options["database_{$this->_database}"];
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} else if (!empty($options['database'])) {
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$dsn = $options['database'];
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}
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}
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if (!$dsn) {
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throw new Exception("No database name / dsn found anywhere");
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}
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return $dsn;
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}
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static function blow()
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{
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$c = self::memcache();
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if (empty($c)) {
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return false;
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}
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$args = func_get_args();
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$format = array_shift($args);
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$keyPart = vsprintf($format, $args);
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$cacheKey = common_cache_key($keyPart);
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return $c->delete($cacheKey);
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}
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}
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