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msd2/myoos/includes/lib/adodb/adodb-memcache.lib.inc.php

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+<?php
+
+// security - hide paths
+if (!defined('ADODB_DIR')) die();
+
+global $ADODB_INCLUDED_MEMCACHE;
+$ADODB_INCLUDED_MEMCACHE = 1;
+
+global $ADODB_INCLUDED_CSV;
+if (empty($ADODB_INCLUDED_CSV)) include_once(ADODB_DIR.'/adodb-csvlib.inc.php');
+
+/*
+
+  @version   v5.20.14  06-Jan-2019
+  @copyright (c) 2000-2013 John Lim (jlim#natsoft.com). All rights reserved.
+  @copyright (c) 2014      Damien Regad, Mark Newnham and the ADOdb community
+  Released under both BSD license and Lesser GPL library license.
+  Whenever there is any discrepancy between the two licenses,
+  the BSD license will take precedence. See License.txt.
+  Set tabs to 4 for best viewing.
+
+  Latest version is available at http://adodb.org/
+
+Usage:
+
+$db = NewADOConnection($driver);
+$db->memCache = true; /// should we use memCache instead of caching in files
+$db->memCacheHost = array($ip1, $ip2, $ip3);
+$db->memCachePort = 11211; /// this is default memCache port
+$db->memCacheCompress = false; /// Use 'true' to store the item compressed (uses zlib)
+
+$db->Connect(...);
+$db->CacheExecute($sql);
+
+  Note the memcache class is shared by all connections, is created during the first call to Connect/PConnect.
+
+  Class instance is stored in $ADODB_CACHE
+*/
+
+	class ADODB_Cache_MemCache {
+		var $createdir = false; // create caching directory structure?
+
+		//-----------------------------
+		// memcache specific variables
+
+		var $hosts;	// array of hosts
+		var $port = 11211;
+		var $compress = false; // memcache compression with zlib
+
+		var $_connected = false;
+		var $_memcache = false;
+
+		function __construct(&$obj)
+		{
+			$this->hosts = $obj->memCacheHost;
+			$this->port = $obj->memCachePort;
+			$this->compress = $obj->memCacheCompress;
+		}
+
+		// implement as lazy connection. The connection only occurs on CacheExecute call
+		function connect(&$err)
+		{
+			if (!function_exists('memcache_pconnect')) {
+				$err = 'Memcache module PECL extension not found!';
+				return false;
+			}
+
+			$memcache = new MemCache;
+
+			if (!is_array($this->hosts)) $this->hosts = array($this->hosts);
+
+			$failcnt = 0;
+			foreach($this->hosts as $host) {
+				if (!@$memcache->addServer($host,$this->port,true)) {
+					$failcnt += 1;
+				}
+			}
+			if ($failcnt == sizeof($this->hosts)) {
+				$err = 'Can\'t connect to any memcache server';
+				return false;
+			}
+			$this->_connected = true;
+			$this->_memcache = $memcache;
+			return true;
+		}
+
+		// returns true or false. true if successful save
+		function writecache($filename, $contents, $debug, $secs2cache)
+		{
+			if (!$this->_connected) {
+				$err = '';
+				if (!$this->connect($err) && $debug) ADOConnection::outp($err);
+			}
+			if (!$this->_memcache) return false;
+
+			if (!$this->_memcache->set($filename, $contents, $this->compress ? MEMCACHE_COMPRESSED : 0, $secs2cache)) {
+				if ($debug) ADOConnection::outp(" Failed to save data at the memcached server!<br>\n");
+				return false;
+			}
+
+			return true;
+		}
+
+		// returns a recordset
+		function readcache($filename, &$err, $secs2cache, $rsClass)
+		{
+			$false = false;
+			if (!$this->_connected) $this->connect($err);
+			if (!$this->_memcache) return $false;
+
+			$rs = $this->_memcache->get($filename);
+			if (!$rs) {
+				$err = 'Item with such key doesn\'t exists on the memcached server.';
+				return $false;
+			}
+
+			// hack, should actually use _csv2rs
+			$rs = explode("\n", $rs);
+            unset($rs[0]);
+            $rs = join("\n", $rs);
+ 			$rs = unserialize($rs);
+			if (! is_object($rs)) {
+				$err = 'Unable to unserialize $rs';
+				return $false;
+			}
+			if ($rs->timeCreated == 0) return $rs; // apparently have been reports that timeCreated was set to 0 somewhere
+
+			$tdiff = intval($rs->timeCreated+$secs2cache - time());
+			if ($tdiff <= 2) {
+				switch($tdiff) {
+					case 2:
+						if ((rand() & 15) == 0) {
+							$err = "Timeout 2";
+							return $false;
+						}
+						break;
+					case 1:
+						if ((rand() & 3) == 0) {
+							$err = "Timeout 1";
+							return $false;
+						}
+						break;
+					default:
+						$err = "Timeout 0";
+						return $false;
+				}
+			}
+			return $rs;
+		}
+
+		function flushall($debug=false)
+		{
+			if (!$this->_connected) {
+				$err = '';
+				if (!$this->connect($err) && $debug) ADOConnection::outp($err);
+			}
+			if (!$this->_memcache) return false;
+
+			$del = $this->_memcache->flush();
+
+			if ($debug)
+				if (!$del) ADOConnection::outp("flushall: failed!<br>\n");
+				else ADOConnection::outp("flushall: succeeded!<br>\n");
+
+			return $del;
+		}
+
+		function flushcache($filename, $debug=false)
+		{
+			if (!$this->_connected) {
+  				$err = '';
+  				if (!$this->connect($err) && $debug) ADOConnection::outp($err);
+			}
+			if (!$this->_memcache) return false;
+
+			$del = $this->_memcache->delete($filename);
+
+			if ($debug)
+				if (!$del) ADOConnection::outp("flushcache: $key entry doesn't exist on memcached server!<br>\n");
+				else ADOConnection::outp("flushcache: $key entry flushed from memcached server!<br>\n");
+
+			return $del;
+		}
+
+		// not used for memcache
+		function createdir($dir, $hash)
+		{
+			return true;
+		}
+	}