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[bus.git] / busui / owa / includes / memcached-client.php
blob:a/busui/owa/includes/memcached-client.php -> blob:b/busui/owa/includes/memcached-client.php
--- a/busui/owa/includes/memcached-client.php
+++ b/busui/owa/includes/memcached-client.php
@@ -1,1 +1,1098 @@
-
+<?php
+//
+// +---------------------------------------------------------------------------+
+// | memcached client, PHP                                                     |
+// +---------------------------------------------------------------------------+
+// | Copyright (c) 2003 Ryan T. Dean <rtdean@cytherianage.net>                 |
+// | All rights reserved.                                                      |
+// |                                                                           |
+// | Redistribution and use in source and binary forms, with or without        |
+// | modification, are permitted provided that the following conditions        |
+// | are met:                                                                  |
+// |                                                                           |
+// | 1. Redistributions of source code must retain the above copyright         |
+// |    notice, this list of conditions and the following disclaimer.          |
+// | 2. Redistributions in binary form must reproduce the above copyright      |
+// |    notice, this list of conditions and the following disclaimer in the    |
+// |    documentation and/or other materials provided with the distribution.   |
+// |                                                                           |
+// | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR      |
+// | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
+// | OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.   |
+// | IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,          |
+// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT  |
+// | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
+// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY     |
+// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT       |
+// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF  |
+// | THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.         |
+// +---------------------------------------------------------------------------+
+// | Author: Ryan T. Dean <rtdean@cytherianage.net>                            |
+// | Heavily influenced by the Perl memcached client by Brad Fitzpatrick.      |
+// |   Permission granted by Brad Fitzpatrick for relicense of ported Perl     |
+// |   client logic under 2-clause BSD license.                                |
+// +---------------------------------------------------------------------------+
+//
+// $TCAnet$
+//
+
+/**
+ * This is the PHP client for memcached - a distributed memory cache daemon.
+ * More information is available at http://www.danga.com/memcached/
+ *
+ * Usage example:
+ *
+ * require_once 'memcached.php';
+ *
+ * $mc = new memcached(array(
+ *              'servers' => array('127.0.0.1:10000',
+ *                                 array('192.0.0.1:10010', 2),
+ *                                 '127.0.0.1:10020'),
+ *              'debug'   => false,
+ *              'compress_threshold' => 10240,
+ *              'persistant' => true));
+ *
+ * $mc->add('key', array('some', 'array'));
+ * $mc->replace('key', 'some random string');
+ * $val = $mc->get('key');
+ *
+ * @author  Ryan T. Dean <rtdean@cytherianage.net>
+ * @version 0.1.2
+ */
+
+// {{{ requirements
+// }}}
+
+// {{{ class memcached
+/**
+ * memcached client class implemented using (p)fsockopen()
+ *
+ * @author  Ryan T. Dean <rtdean@cytherianage.net>
+ * @ingroup Cache
+ */
+class memcached
+{
+   // {{{ properties
+   // {{{ public
+
+		// {{{ constants
+		// {{{ flags
+
+		/**
+		 * Flag: indicates data is serialized
+		 */
+		const SERIALIZED = 1;
+
+		/**
+		 * Flag: indicates data is compressed
+		 */
+		const COMPRESSED = 2;
+
+		// }}}
+
+		/**
+		 * Minimum savings to store data compressed
+		 */
+		const COMPRESSION_SAVINGS = 0.20;
+
+		// }}}
+
+
+   /**
+    * Command statistics
+    *
+    * @var     array
+    * @access  public
+    */
+   var $stats;
+
+   // }}}
+   // {{{ private
+
+   /**
+    * Cached Sockets that are connected
+    *
+    * @var     array
+    * @access  private
+    */
+   var $_cache_sock;
+
+   /**
+    * Current debug status; 0 - none to 9 - profiling
+    *
+    * @var     boolean
+    * @access  private
+    */
+   var $_debug;
+
+   /**
+    * Dead hosts, assoc array, 'host'=>'unixtime when ok to check again'
+    *
+    * @var     array
+    * @access  private
+    */
+   var $_host_dead;
+
+   /**
+    * Is compression available?
+    *
+    * @var     boolean
+    * @access  private
+    */
+   var $_have_zlib;
+
+   /**
+    * Do we want to use compression?
+    *
+    * @var     boolean
+    * @access  private
+    */
+   var $_compress_enable;
+
+   /**
+    * At how many bytes should we compress?
+    *
+    * @var     integer
+    * @access  private
+    */
+   var $_compress_threshold;
+
+   /**
+    * Are we using persistant links?
+    *
+    * @var     boolean
+    * @access  private
+    */
+   var $_persistant;
+
+   /**
+    * If only using one server; contains ip:port to connect to
+    *
+    * @var     string
+    * @access  private
+    */
+   var $_single_sock;
+
+   /**
+    * Array containing ip:port or array(ip:port, weight)
+    *
+    * @var     array
+    * @access  private
+    */
+   var $_servers;
+
+   /**
+    * Our bit buckets
+    *
+    * @var     array
+    * @access  private
+    */
+   var $_buckets;
+
+   /**
+    * Total # of bit buckets we have
+    *
+    * @var     integer
+    * @access  private
+    */
+   var $_bucketcount;
+
+   /**
+    * # of total servers we have
+    *
+    * @var     integer
+    * @access  private
+    */
+   var $_active;
+
+   /**
+    * Stream timeout in seconds. Applies for example to fread()
+    *
+    * @var     integer
+    * @access  private
+    */
+   var $_timeout_seconds;
+
+   /**
+    * Stream timeout in microseconds
+    *
+    * @var     integer
+    * @access  private
+    */
+   var $_timeout_microseconds;
+
+   /**
+    * Connect timeout in seconds
+    */
+   var $_connect_timeout;
+
+   /**
+    * Number of connection attempts for each server
+    */
+   var $_connect_attempts;
+
+   // }}}
+   // }}}
+   // {{{ methods
+   // {{{ public functions
+   // {{{ memcached()
+
+   /**
+    * Memcache initializer
+    *
+    * @param   array    $args    Associative array of settings
+    *
+    * @return  mixed
+    * @access  public
+    */
+   function memcached ($args)
+   {
+      $this->set_servers(@$args['servers']);
+      $this->_debug = @$args['debug'];
+      $this->stats = array();
+      $this->_compress_threshold = @$args['compress_threshold'];
+      $this->_persistant = array_key_exists('persistant', $args) ? (@$args['persistant']) : false;
+      $this->_compress_enable = true;
+      $this->_have_zlib = function_exists("gzcompress");
+
+      $this->_cache_sock = array();
+      $this->_host_dead = array();
+
+      $this->_timeout_seconds = 1;
+      $this->_timeout_microseconds = 0;
+
+      $this->_connect_timeout = 0.01;
+      $this->_connect_attempts = 3;
+   }
+
+   // }}}
+   // {{{ add()
+
+   /**
+    * Adds a key/value to the memcache server if one isn't already set with
+    * that key
+    *
+    * @param   string  $key     Key to set with data
+    * @param   mixed   $val     Value to store
+    * @param   integer $exp     (optional) Time to expire data at
+    *
+    * @return  boolean
+    * @access  public
+    */
+   function add ($key, $val, $exp = 0)
+   {
+      return $this->_set('add', $key, $val, $exp);
+   }
+
+   // }}}
+   // {{{ decr()
+
+   /**
+    * Decriment a value stored on the memcache server
+    *
+    * @param   string   $key     Key to decriment
+    * @param   integer  $amt     (optional) Amount to decriment
+    *
+    * @return  mixed    FALSE on failure, value on success
+    * @access  public
+    */
+   function decr ($key, $amt=1)
+   {
+      return $this->_incrdecr('decr', $key, $amt);
+   }
+
+   // }}}
+   // {{{ delete()
+
+   /**
+    * Deletes a key from the server, optionally after $time
+    *
+    * @param   string   $key     Key to delete
+    * @param   integer  $time    (optional) How long to wait before deleting
+    *
+    * @return  boolean  TRUE on success, FALSE on failure
+    * @access  public
+    */
+   function delete ($key, $time = 0)
+   {
+      if (!$this->_active)
+         return false;
+
+      $sock = $this->get_sock($key);
+      if (!is_resource($sock))
+         return false;
+
+      $key = is_array($key) ? $key[1] : $key;
+
+      @$this->stats['delete']++;
+      $cmd = "delete $key $time\r\n";
+      if(!$this->_safe_fwrite($sock, $cmd, strlen($cmd)))
+      {
+         $this->_dead_sock($sock);
+         return false;
+      }
+      $res = trim(fgets($sock));
+
+      if ($this->_debug)
+         $this->_debugprint(sprintf("MemCache: delete %s (%s)\n", $key, $res));
+
+      if ($res == "DELETED")
+         return true;
+      return false;
+   }
+
+   // }}}
+   // {{{ disconnect_all()
+
+   /**
+    * Disconnects all connected sockets
+    *
+    * @access  public
+    */
+   function disconnect_all ()
+   {
+      foreach ($this->_cache_sock as $sock)
+         fclose($sock);
+
+      $this->_cache_sock = array();
+   }
+
+   // }}}
+   // {{{ enable_compress()
+
+   /**
+    * Enable / Disable compression
+    *
+    * @param   boolean  $enable  TRUE to enable, FALSE to disable
+    *
+    * @access  public
+    */
+   function enable_compress ($enable)
+   {
+      $this->_compress_enable = $enable;
+   }
+
+   // }}}
+   // {{{ forget_dead_hosts()
+
+   /**
+    * Forget about all of the dead hosts
+    *
+    * @access  public
+    */
+   function forget_dead_hosts ()
+   {
+      $this->_host_dead = array();
+   }
+
+   // }}}
+   // {{{ get()
+
+   /**
+    * Retrieves the value associated with the key from the memcache server
+    *
+    * @param  string   $key     Key to retrieve
+    *
+    * @return  mixed
+    * @access  public
+    */
+   function get ($key)
+   {
+      $fname = 'memcached::get';
+      
+      if (defined('MEDIAWIKI')) wfProfileIn( $fname );
+
+      if ( $this->_debug ) {
+         $this->_debugprint( "get($key)\n" );
+      }
+
+      if (!$this->_active) {
+	     if (defined('MEDIAWIKI')) wfProfileOut( $fname );
+         return false;
+      }
+
+      $sock = $this->get_sock($key);
+
+      if (!is_resource($sock)) {
+	     if (defined('MEDIAWIKI')) wfProfileOut( $fname );
+         return false;
+      }
+
+      @$this->stats['get']++;
+
+      $cmd = "get $key\r\n";
+      if (!$this->_safe_fwrite($sock, $cmd, strlen($cmd)))
+      {
+         $this->_dead_sock($sock);
+	     if (defined('MEDIAWIKI')) wfProfileOut( $fname );
+         return false;
+      }
+
+      $val = array();
+      $this->_load_items($sock, $val);
+
+      if ($this->_debug)
+         foreach ($val as $k => $v)
+            $this->_debugprint(sprintf("MemCache: sock %s got %s\n", serialize($sock), $k));
+
+      if (defined('MEDIAWIKI')) wfProfileOut( $fname );
+      return @$val[$key];
+   }
+
+   // }}}
+   // {{{ get_multi()
+
+   /**
+    * Get multiple keys from the server(s)
+    *
+    * @param   array    $keys    Keys to retrieve
+    *
+    * @return  array
+    * @access  public
+    */
+   function get_multi ($keys)
+   {
+      if (!$this->_active)
+         return false;
+
+      @$this->stats['get_multi']++;
+      $sock_keys = array();
+
+      foreach ($keys as $key)
+      {
+         $sock = $this->get_sock($key);
+         if (!is_resource($sock)) continue;
+         $key = is_array($key) ? $key[1] : $key;
+         if (!isset($sock_keys[$sock]))
+         {
+            $sock_keys[$sock] = array();
+            $socks[] = $sock;
+         }
+         $sock_keys[$sock][] = $key;
+      }
+
+      // Send out the requests
+      foreach ($socks as $sock)
+      {
+         $cmd = "get";
+         foreach ($sock_keys[$sock] as $key)
+         {
+            $cmd .= " ". $key;
+         }
+         $cmd .= "\r\n";
+
+         if ($this->_safe_fwrite($sock, $cmd, strlen($cmd)))
+         {
+            $gather[] = $sock;
+         } else
+         {
+            $this->_dead_sock($sock);
+         }
+      }
+
+      // Parse responses
+      $val = array();
+      foreach ($gather as $sock)
+      {
+         $this->_load_items($sock, $val);
+      }
+
+      if ($this->_debug)
+         foreach ($val as $k => $v)
+            $this->_debugprint(sprintf("MemCache: got %s\n", $k));
+
+      return $val;
+   }
+
+   // }}}
+   // {{{ incr()
+
+   /**
+    * Increments $key (optionally) by $amt
+    *
+    * @param   string   $key     Key to increment
+    * @param   integer  $amt     (optional) amount to increment
+    *
+    * @return  integer  New key value?
+    * @access  public
+    */
+   function incr ($key, $amt=1)
+   {
+      return $this->_incrdecr('incr', $key, $amt);
+   }
+
+   // }}}
+   // {{{ replace()
+
+   /**
+    * Overwrites an existing value for key; only works if key is already set
+    *
+    * @param   string   $key     Key to set value as
+    * @param   mixed    $value   Value to store
+    * @param   integer  $exp     (optional) Experiation time
+    *
+    * @return  boolean
+    * @access  public
+    */
+   function replace ($key, $value, $exp=0)
+   {
+      return $this->_set('replace', $key, $value, $exp);
+   }
+
+   // }}}
+   // {{{ run_command()
+
+   /**
+    * Passes through $cmd to the memcache server connected by $sock; returns
+    * output as an array (null array if no output)
+    *
+    * NOTE: due to a possible bug in how PHP reads while using fgets(), each
+    *       line may not be terminated by a \r\n.  More specifically, my testing
+    *       has shown that, on FreeBSD at least, each line is terminated only
+    *       with a \n.  This is with the PHP flag auto_detect_line_endings set
+    *       to falase (the default).
+    *
+    * @param   resource $sock    Socket to send command on
+    * @param   string   $cmd     Command to run
+    *
+    * @return  array    Output array
+    * @access  public
+    */
+   function run_command ($sock, $cmd)
+   {
+      if (!is_resource($sock))
+         return array();
+
+      if (!$this->_safe_fwrite($sock, $cmd, strlen($cmd)))
+         return array();
+
+      while (true)
+      {
+         $res = fgets($sock);
+         $ret[] = $res;
+         if (preg_match('/^END/', $res))
+            break;
+         if (strlen($res) == 0)
+            break;
+      }
+      return $ret;
+   }
+
+   // }}}
+   // {{{ set()
+
+   /**
+    * Unconditionally sets a key to a given value in the memcache.  Returns true
+    * if set successfully.
+    *
+    * @param   string   $key     Key to set value as
+    * @param   mixed    $value   Value to set
+    * @param   integer  $exp     (optional) Experiation time
+    *
+    * @return  boolean  TRUE on success
+    * @access  public
+    */
+   function set ($key, $value, $exp=0)
+   {
+      return $this->_set('set', $key, $value, $exp);
+   }
+
+   // }}}
+   // {{{ set_compress_threshold()
+
+   /**
+    * Sets the compression threshold
+    *
+    * @param   integer  $thresh  Threshold to compress if larger than
+    *
+    * @access  public
+    */
+   function set_compress_threshold ($thresh)
+   {
+      $this->_compress_threshold = $thresh;
+   }
+
+   // }}}
+   // {{{ set_debug()
+
+   /**
+    * Sets the debug flag
+    *
+    * @param   boolean  $dbg     TRUE for debugging, FALSE otherwise
+    *
+    * @access  public
+    *
+    * @see     memcahced::memcached
+    */
+   function set_debug ($dbg)
+   {
+      $this->_debug = $dbg;
+   }
+
+   // }}}
+   // {{{ set_servers()
+
+   /**
+    * Sets the server list to distribute key gets and puts between
+    *
+    * @param   array    $list    Array of servers to connect to
+    *
+    * @access  public
+    *
+    * @see     memcached::memcached()
+    */
+   function set_servers ($list)
+   {
+      $this->_servers = $list;
+      $this->_active = count($list);
+      $this->_buckets = null;
+      $this->_bucketcount = 0;
+
+      $this->_single_sock = null;
+      if ($this->_active == 1)
+         $this->_single_sock = $this->_servers[0];
+   }
+
+   /**
+    * Sets the timeout for new connections
+    *
+    * @param   integer  $seconds Number of seconds
+    * @param   integer  $microseconds  Number of microseconds
+    *
+    * @access  public
+    */
+   function set_timeout ($seconds, $microseconds)
+   {
+      $this->_timeout_seconds = $seconds;
+      $this->_timeout_microseconds = $microseconds;
+   }
+
+   // }}}
+   // }}}
+   // {{{ private methods
+   // {{{ _close_sock()
+
+   /**
+    * Close the specified socket
+    *
+    * @param   string   $sock    Socket to close
+    *
+    * @access  private
+    */
+   function _close_sock ($sock)
+   {
+      $host = array_search($sock, $this->_cache_sock);
+      fclose($this->_cache_sock[$host]);
+      unset($this->_cache_sock[$host]);
+   }
+
+   // }}}
+   // {{{ _connect_sock()
+
+   /**
+    * Connects $sock to $host, timing out after $timeout
+    *
+    * @param   integer  $sock    Socket to connect
+    * @param   string   $host    Host:IP to connect to
+    *
+    * @return  boolean
+    * @access  private
+    */
+   function _connect_sock (&$sock, $host)
+   {
+      list ($ip, $port) = explode(":", $host);
+      $sock = false;
+      $timeout = $this->_connect_timeout;
+      $errno = $errstr = null;
+      for ($i = 0; !$sock && $i < $this->_connect_attempts; $i++) {
+         if ($i > 0) {
+            # Sleep until the timeout, in case it failed fast
+            $elapsed = microtime(true) - $t;
+            if ( $elapsed < $timeout ) {
+               usleep(($timeout - $elapsed) * 1e6);
+            }
+            $timeout *= 2;
+         }
+         $t = microtime(true);
+         if ($this->_persistant == 1)
+         {
+            $sock = @pfsockopen($ip, $port, $errno, $errstr, $timeout);
+         } else
+         {
+            $sock = @fsockopen($ip, $port, $errno, $errstr, $timeout);
+         }
+      }
+      if (!$sock) {
+         if ($this->_debug)
+            $this->_debugprint( "Error connecting to $host: $errstr\n" );
+         return false;
+      }
+
+      // Initialise timeout
+      stream_set_timeout($sock, $this->_timeout_seconds, $this->_timeout_microseconds);
+
+      return true;
+   }
+
+   // }}}
+   // {{{ _dead_sock()
+
+   /**
+    * Marks a host as dead until 30-40 seconds in the future
+    *
+    * @param   string   $sock    Socket to mark as dead
+    *
+    * @access  private
+    */
+   function _dead_sock ($sock)
+   {
+      $host = array_search($sock, $this->_cache_sock);
+      @list ($ip, /* $port */) = explode(":", $host);
+      $this->_host_dead[$ip] = time() + 30 + intval(rand(0, 10));
+      $this->_host_dead[$host] = $this->_host_dead[$ip];
+      unset($this->_cache_sock[$host]);
+   }
+
+   // }}}
+   // {{{ get_sock()
+
+   /**
+    * get_sock
+    *
+    * @param   string   $key     Key to retrieve value for;
+    *
+    * @return  mixed    resource on success, false on failure
+    * @access  private
+    */
+   function get_sock ($key)
+   {
+      if (!$this->_active)
+         return false;
+
+      if ($this->_single_sock !== null) {
+         $this->_flush_read_buffer($this->_single_sock);
+         return $this->sock_to_host($this->_single_sock);
+      }
+
+      $hv = is_array($key) ? intval($key[0]) : $this->_hashfunc($key);
+
+      if ($this->_buckets === null)
+      {
+         foreach ($this->_servers as $v)
+         {
+            if (is_array($v))
+            {
+               for ($i=0; $i<$v[1]; $i++)
+                  $bu[] = $v[0];
+            } else
+            {
+               $bu[] = $v;
+            }
+         }
+         $this->_buckets = $bu;
+         $this->_bucketcount = count($bu);
+      }
+
+      $realkey = is_array($key) ? $key[1] : $key;
+      for ($tries = 0; $tries<20; $tries++)
+      {
+         $host = $this->_buckets[$hv % $this->_bucketcount];
+         $sock = $this->sock_to_host($host);
+         if (is_resource($sock)) {
+            $this->_flush_read_buffer($sock);
+            return $sock;
+		 }
+         $hv = $this->_hashfunc( $hv . $realkey );
+      }
+
+      return false;
+   }
+
+   // }}}
+   // {{{ _hashfunc()
+
+   /**
+    * Creates a hash integer  based on the $key
+    *
+    * @param   string   $key     Key to hash
+    *
+    * @return  integer  Hash value
+    * @access  private
+    */
+   function _hashfunc ($key)
+   {
+      # Hash function must on [0,0x7ffffff]
+      # We take the first 31 bits of the MD5 hash, which unlike the hash
+      # function used in a previous version of this client, works
+      return hexdec(substr(md5($key),0,8)) & 0x7fffffff;
+   }
+
+   // }}}
+   // {{{ _incrdecr()
+
+   /**
+    * Perform increment/decriment on $key
+    *
+    * @param   string   $cmd     Command to perform
+    * @param   string   $key     Key to perform it on
+    * @param   integer  $amt     Amount to adjust
+    *
+    * @return  integer     New value of $key
+    * @access  private
+    */
+   function _incrdecr ($cmd, $key, $amt=1)
+   {
+      if (!$this->_active)
+         return null;
+
+      $sock = $this->get_sock($key);
+      if (!is_resource($sock))
+         return null;
+
+      $key = is_array($key) ? $key[1] : $key;
+      @$this->stats[$cmd]++;
+      if (!$this->_safe_fwrite($sock, "$cmd $key $amt\r\n"))
+         return $this->_dead_sock($sock);
+
+      stream_set_timeout($sock, 1, 0);
+      $line = fgets($sock);
+      $match = array();
+      if (!preg_match('/^(\d+)/', $line, $match))
+         return null;
+      return $match[1];
+   }
+
+   // }}}
+   // {{{ _load_items()
+
+   /**
+    * Load items into $ret from $sock
+    *
+    * @param   resource $sock    Socket to read from
+    * @param   array    $ret     Returned values
+    *
+    * @access  private
+    */
+   function _load_items ($sock, &$ret)
+   {
+      while (1)
+      {
+         $decl = fgets($sock);
+         if ($decl == "END\r\n")
+         {
+            return true;
+         } elseif (preg_match('/^VALUE (\S+) (\d+) (\d+)\r\n$/', $decl, $match))
+         {
+            list($rkey, $flags, $len) = array($match[1], $match[2], $match[3]);
+            $bneed = $len+2;
+            $offset = 0;
+
+            while ($bneed > 0)
+            {
+               $data = fread($sock, $bneed);
+               $n = strlen($data);
+               if ($n == 0)
+                  break;
+               $offset += $n;
+               $bneed -= $n;
+               @$ret[$rkey] .= $data;
+            }
+
+            if ($offset != $len+2)
+            {
+               // Something is borked!
+               if ($this->_debug)
+                  $this->_debugprint(sprintf("Something is borked!  key %s expecting %d got %d length\n", $rkey, $len+2, $offset));
+
+               unset($ret[$rkey]);
+               $this->_close_sock($sock);
+               return false;
+            }
+
+            if ($this->_have_zlib && $flags & memcached::COMPRESSED)
+               $ret[$rkey] = gzuncompress($ret[$rkey]);
+
+            $ret[$rkey] = rtrim($ret[$rkey]);
+
+            if ($flags & memcached::SERIALIZED)
+               $ret[$rkey] = unserialize($ret[$rkey]);
+
+         } else
+         {
+            $this->_debugprint("Error parsing memcached response\n");
+            return 0;
+         }
+      }
+   }
+
+   // }}}
+   // {{{ _set()
+
+   /**
+    * Performs the requested storage operation to the memcache server
+    *
+    * @param   string   $cmd     Command to perform
+    * @param   string   $key     Key to act on
+    * @param   mixed    $val     What we need to store
+    * @param   integer  $exp     When it should expire
+    *
+    * @return  boolean
+    * @access  private
+    */
+   function _set ($cmd, $key, $val, $exp)
+   {
+      if (!$this->_active)
+         return false;
+
+      $sock = $this->get_sock($key);
+      if (!is_resource($sock))
+         return false;
+
+      @$this->stats[$cmd]++;
+
+      $flags = 0;
+
+      if (!is_scalar($val))
+      {
+         $val = serialize($val);
+         $flags |= memcached::SERIALIZED;
+         if ($this->_debug)
+            $this->_debugprint(sprintf("client: serializing data as it is not scalar\n"));
+      }
+
+      $len = strlen($val);
+
+      if ($this->_have_zlib && $this->_compress_enable &&
+          $this->_compress_threshold && $len >= $this->_compress_threshold)
+      {
+         $c_val = gzcompress($val, 9);
+         $c_len = strlen($c_val);
+
+         if ($c_len < $len*(1 - memcached::COMPRESSION_SAVINGS))
+         {
+            if ($this->_debug)
+               $this->_debugprint(sprintf("client: compressing data; was %d bytes is now %d bytes\n", $len, $c_len));
+            $val = $c_val;
+            $len = $c_len;
+            $flags |= memcached::COMPRESSED;
+         }
+      }
+      if (!$this->_safe_fwrite($sock, "$cmd $key $flags $exp $len\r\n$val\r\n"))
+         return $this->_dead_sock($sock);
+
+      $line = trim(fgets($sock));
+
+      if ($this->_debug)
+      {
+         $this->_debugprint(sprintf("%s %s (%s)\n", $cmd, $key, $line));
+      }
+      if ($line == "STORED")
+         return true;
+      return false;
+   }
+
+   // }}}
+   // {{{ sock_to_host()
+
+   /**
+    * Returns the socket for the host
+    *
+    * @param   string   $host    Host:IP to get socket for
+    *
+    * @return  mixed    IO Stream or false
+    * @access  private
+    */
+   function sock_to_host ($host)
+   {
+      if (isset($this->_cache_sock[$host]))
+         return $this->_cache_sock[$host];
+
+      $sock = null;
+      $now = time();
+      list ($ip, /* $port */) = explode (":", $host);
+      if (isset($this->_host_dead[$host]) && $this->_host_dead[$host] > $now ||
+          isset($this->_host_dead[$ip]) && $this->_host_dead[$ip] > $now)
+         return null;
+
+      if (!$this->_connect_sock($sock, $host))
+         return $this->_dead_sock($host);
+
+      // Do not buffer writes
+      stream_set_write_buffer($sock, 0);
+
+      $this->_cache_sock[$host] = $sock;
+
+      return $this->_cache_sock[$host];
+   }
+
+   function _debugprint($str){
+      print($str);
+   }
+
+   /**
+    * Write to a stream, timing out after the correct amount of time
+    *
+    * @return bool false on failure, true on success
+    */
+    /*
+   function _safe_fwrite($f, $buf, $len = false) {
+      stream_set_blocking($f, 0);
+
+      if ($len === false) {
+         wfDebug("Writing " . strlen( $buf ) . " bytes\n");
+         $bytesWritten = fwrite($f, $buf);
+      } else {
+         wfDebug("Writing $len bytes\n");
+         $bytesWritten = fwrite($f, $buf, $len);
+      }
+      $n = stream_select($r=NULL, $w = array($f), $e = NULL, 10, 0);
+      #   $this->_timeout_seconds, $this->_timeout_microseconds);
+
+      wfDebug("stream_select returned $n\n");
+      stream_set_blocking($f, 1);
+      return $n == 1;
+      return $bytesWritten;
+   }*/
+
+   /**
+    * Original behaviour
+    */
+   function _safe_fwrite($f, $buf, $len = false) {
+      if ($len === false) {
+         $bytesWritten = fwrite($f, $buf);
+      } else {
+         $bytesWritten = fwrite($f, $buf, $len);
+      }
+      return $bytesWritten;
+   }
+
+   /**
+    * Flush the read buffer of a stream
+    */
+   function _flush_read_buffer($f) {
+      if (!is_resource($f)) {
+         return;
+      }
+      
+      $r = array( $f ); 
+      $w = NULL; 
+      $e = NULL;
+      $n = stream_select( $r, $w, $e, 0, 0 );
+      while ($n == 1 && !feof($f)) {
+         fread($f, 1024);
+         $r= array( $f ); 
+         $w = NULL; 
+         $e = NULL;
+         $n = stream_select( $r, $w, $e, 0, 0 );
+      }
+   }
+
+   // }}}
+   // }}}
+   // }}}
+}
+
+// vim: sts=3 sw=3 et
+
+// }}}
+?>