--- /dev/null
+<?php
+// @codingStandardsIgnoreFile It's an external lib and it isn't. Let's not bother.
+/**
+ * Memcached client for 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. |
+ * +---------------------------------------------------------------------------+
+ *
+ * @file
+ * $TCAnet$
+ */
+
+/**
+ * This is a PHP client for memcached - a distributed memory cache daemon.
+ *
+ * More information is available at http://www.danga.com/memcached/
+ *
+ * Usage example:
+ *
+ * $mc = new MemcachedClient(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,
+ * 'persistent' => 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
+ */
+
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+
+// {{{ class MemcachedClient
+/**
+ * memcached client class implemented using (p)fsockopen()
+ *
+ * @author Ryan T. Dean <rtdean@cytherianage.net>
+ * @ingroup Cache
+ */
+class MemcachedClient {
+ // {{{ properties
+ // {{{ public
+
+ // {{{ constants
+ // {{{ flags
+
+ /**
+ * Flag: indicates data is serialized
+ */
+ const SERIALIZED = 1;
+
+ /**
+ * Flag: indicates data is compressed
+ */
+ const COMPRESSED = 2;
+
+ /**
+ * Flag: indicates data is an integer
+ */
+ const INTVAL = 4;
+
+ // }}}
+
+ /**
+ * Minimum savings to store data compressed
+ */
+ const COMPRESSION_SAVINGS = 0.20;
+
+ // }}}
+
+ /**
+ * Command statistics
+ *
+ * @var array
+ * @access public
+ */
+ public $stats;
+
+ // }}}
+ // {{{ private
+
+ /**
+ * Cached Sockets that are connected
+ *
+ * @var array
+ * @access private
+ */
+ public $_cache_sock;
+
+ /**
+ * Current debug status; 0 - none to 9 - profiling
+ *
+ * @var bool
+ * @access private
+ */
+ public $_debug;
+
+ /**
+ * Dead hosts, assoc array, 'host'=>'unixtime when ok to check again'
+ *
+ * @var array
+ * @access private
+ */
+ public $_host_dead;
+
+ /**
+ * Is compression available?
+ *
+ * @var bool
+ * @access private
+ */
+ public $_have_zlib;
+
+ /**
+ * Do we want to use compression?
+ *
+ * @var bool
+ * @access private
+ */
+ public $_compress_enable;
+
+ /**
+ * At how many bytes should we compress?
+ *
+ * @var int
+ * @access private
+ */
+ public $_compress_threshold;
+
+ /**
+ * Are we using persistent links?
+ *
+ * @var bool
+ * @access private
+ */
+ public $_persistent;
+
+ /**
+ * If only using one server; contains ip:port to connect to
+ *
+ * @var string
+ * @access private
+ */
+ public $_single_sock;
+
+ /**
+ * Array containing ip:port or array(ip:port, weight)
+ *
+ * @var array
+ * @access private
+ */
+ public $_servers;
+
+ /**
+ * Our bit buckets
+ *
+ * @var array
+ * @access private
+ */
+ public $_buckets;
+
+ /**
+ * Total # of bit buckets we have
+ *
+ * @var int
+ * @access private
+ */
+ public $_bucketcount;
+
+ /**
+ * # of total servers we have
+ *
+ * @var int
+ * @access private
+ */
+ public $_active;
+
+ /**
+ * Stream timeout in seconds. Applies for example to fread()
+ *
+ * @var int
+ * @access private
+ */
+ public $_timeout_seconds;
+
+ /**
+ * Stream timeout in microseconds
+ *
+ * @var int
+ * @access private
+ */
+ public $_timeout_microseconds;
+
+ /**
+ * Connect timeout in seconds
+ */
+ public $_connect_timeout;
+
+ /**
+ * Number of connection attempts for each server
+ */
+ public $_connect_attempts;
+
+ /**
+ * @var LoggerInterface
+ */
+ private $_logger;
+
+ // }}}
+ // }}}
+ // {{{ methods
+ // {{{ public functions
+ // {{{ memcached()
+
+ /**
+ * Memcache initializer
+ *
+ * @param array $args Associative array of settings
+ *
+ * @return mixed
+ */
+ public function __construct( $args ) {
+ $this->set_servers( isset( $args['servers'] ) ? $args['servers'] : array() );
+ $this->_debug = isset( $args['debug'] ) ? $args['debug'] : false;
+ $this->stats = array();
+ $this->_compress_threshold = isset( $args['compress_threshold'] ) ? $args['compress_threshold'] : 0;
+ $this->_persistent = isset( $args['persistent'] ) ? $args['persistent'] : false;
+ $this->_compress_enable = true;
+ $this->_have_zlib = function_exists( 'gzcompress' );
+
+ $this->_cache_sock = array();
+ $this->_host_dead = array();
+
+ $this->_timeout_seconds = 0;
+ $this->_timeout_microseconds = isset( $args['timeout'] ) ? $args['timeout'] : 500000;
+
+ $this->_connect_timeout = isset( $args['connect_timeout'] ) ? $args['connect_timeout'] : 0.1;
+ $this->_connect_attempts = 2;
+
+ $this->_logger = isset( $args['logger'] ) ? $args['logger'] : new NullLogger();
+ }
+
+ // }}}
+ // {{{ 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 int $exp (optional) Expiration time. This can be a number of seconds
+ * to cache for (up to 30 days inclusive). Any timespans of 30 days + 1 second or
+ * longer must be the timestamp of the time at which the mapping should expire. It
+ * is safe to use timestamps in all cases, regardless of expiration
+ * eg: strtotime("+3 hour")
+ *
+ * @return bool
+ */
+ public function add( $key, $val, $exp = 0 ) {
+ return $this->_set( 'add', $key, $val, $exp );
+ }
+
+ // }}}
+ // {{{ decr()
+
+ /**
+ * Decrease a value stored on the memcache server
+ *
+ * @param string $key Key to decrease
+ * @param int $amt (optional) amount to decrease
+ *
+ * @return mixed False on failure, value on success
+ */
+ 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 int $time (optional) how long to wait before deleting
+ *
+ * @return bool True on success, false on failure
+ */
+ 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;
+
+ if ( isset( $this->stats['delete'] ) ) {
+ $this->stats['delete']++;
+ } else {
+ $this->stats['delete'] = 1;
+ }
+ $cmd = "delete $key $time\r\n";
+ if ( !$this->_fwrite( $sock, $cmd ) ) {
+ return false;
+ }
+ $res = $this->_fgets( $sock );
+
+ if ( $this->_debug ) {
+ $this->_debugprint( sprintf( "MemCache: delete %s (%s)", $key, $res ) );
+ }
+
+ if ( $res == "DELETED" || $res == "NOT_FOUND" ) {
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Changes the TTL on a key from the server to $time
+ *
+ * @param string $key Key
+ * @param int $time TTL in seconds
+ *
+ * @return bool True on success, false on failure
+ */
+ public function touch( $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;
+
+ if ( isset( $this->stats['touch'] ) ) {
+ $this->stats['touch']++;
+ } else {
+ $this->stats['touch'] = 1;
+ }
+ $cmd = "touch $key $time\r\n";
+ if ( !$this->_fwrite( $sock, $cmd ) ) {
+ return false;
+ }
+ $res = $this->_fgets( $sock );
+
+ if ( $this->_debug ) {
+ $this->_debugprint( sprintf( "MemCache: touch %s (%s)", $key, $res ) );
+ }
+
+ if ( $res == "TOUCHED" ) {
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * @param string $key
+ * @param int $timeout
+ * @return bool
+ */
+ public function lock( $key, $timeout = 0 ) {
+ /* stub */
+ return true;
+ }
+
+ /**
+ * @param string $key
+ * @return bool
+ */
+ public function unlock( $key ) {
+ /* stub */
+ return true;
+ }
+
+ // }}}
+ // {{{ disconnect_all()
+
+ /**
+ * Disconnects all connected sockets
+ */
+ public function disconnect_all() {
+ foreach ( $this->_cache_sock as $sock ) {
+ fclose( $sock );
+ }
+
+ $this->_cache_sock = array();
+ }
+
+ // }}}
+ // {{{ enable_compress()
+
+ /**
+ * Enable / Disable compression
+ *
+ * @param bool $enable True to enable, false to disable
+ */
+ public function enable_compress( $enable ) {
+ $this->_compress_enable = $enable;
+ }
+
+ // }}}
+ // {{{ forget_dead_hosts()
+
+ /**
+ * Forget about all of the dead hosts
+ */
+ public function forget_dead_hosts() {
+ $this->_host_dead = array();
+ }
+
+ // }}}
+ // {{{ get()
+
+ /**
+ * Retrieves the value associated with the key from the memcache server
+ *
+ * @param array|string $key key to retrieve
+ * @param float $casToken [optional]
+ *
+ * @return mixed
+ */
+ public function get( $key, &$casToken = null ) {
+ if ( $this->_debug ) {
+ $this->_debugprint( "get($key)" );
+ }
+
+ if ( !is_array( $key ) && strval( $key ) === '' ) {
+ $this->_debugprint( "Skipping key which equals to an empty string" );
+ return false;
+ }
+
+ if ( !$this->_active ) {
+ return false;
+ }
+
+ $sock = $this->get_sock( $key );
+
+ if ( !is_resource( $sock ) ) {
+ return false;
+ }
+
+ $key = is_array( $key ) ? $key[1] : $key;
+ if ( isset( $this->stats['get'] ) ) {
+ $this->stats['get']++;
+ } else {
+ $this->stats['get'] = 1;
+ }
+
+ $cmd = "gets $key\r\n";
+ if ( !$this->_fwrite( $sock, $cmd ) ) {
+ return false;
+ }
+
+ $val = array();
+ $this->_load_items( $sock, $val, $casToken );
+
+ if ( $this->_debug ) {
+ foreach ( $val as $k => $v ) {
+ $this->_debugprint( sprintf( "MemCache: sock %s got %s", serialize( $sock ), $k ) );
+ }
+ }
+
+ $value = false;
+ if ( isset( $val[$key] ) ) {
+ $value = $val[$key];
+ }
+ return $value;
+ }
+
+ // }}}
+ // {{{ get_multi()
+
+ /**
+ * Get multiple keys from the server(s)
+ *
+ * @param array $keys Keys to retrieve
+ *
+ * @return array
+ */
+ public function get_multi( $keys ) {
+ if ( !$this->_active ) {
+ return array();
+ }
+
+ if ( isset( $this->stats['get_multi'] ) ) {
+ $this->stats['get_multi']++;
+ } else {
+ $this->stats['get_multi'] = 1;
+ }
+ $sock_keys = array();
+ $socks = 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[intval( $sock )] = array();
+ $socks[] = $sock;
+ }
+ $sock_keys[intval( $sock )][] = $key;
+ }
+
+ $gather = array();
+ // Send out the requests
+ foreach ( $socks as $sock ) {
+ $cmd = 'gets';
+ foreach ( $sock_keys[intval( $sock )] as $key ) {
+ $cmd .= ' ' . $key;
+ }
+ $cmd .= "\r\n";
+
+ if ( $this->_fwrite( $sock, $cmd ) ) {
+ $gather[] = $sock;
+ }
+ }
+
+ // Parse responses
+ $val = array();
+ foreach ( $gather as $sock ) {
+ $this->_load_items( $sock, $val, $casToken );
+ }
+
+ if ( $this->_debug ) {
+ foreach ( $val as $k => $v ) {
+ $this->_debugprint( sprintf( "MemCache: got %s", $k ) );
+ }
+ }
+
+ return $val;
+ }
+
+ // }}}
+ // {{{ incr()
+
+ /**
+ * Increments $key (optionally) by $amt
+ *
+ * @param string $key Key to increment
+ * @param int $amt (optional) amount to increment
+ *
+ * @return int|null Null if the key does not exist yet (this does NOT
+ * create new mappings if the key does not exist). If the key does
+ * exist, this returns the new value for that key.
+ */
+ 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 int $exp (optional) Expiration time. This can be a number of seconds
+ * to cache for (up to 30 days inclusive). Any timespans of 30 days + 1 second or
+ * longer must be the timestamp of the time at which the mapping should expire. It
+ * is safe to use timestamps in all cases, regardless of exipration
+ * eg: strtotime("+3 hour")
+ *
+ * @return bool
+ */
+ 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)
+ *
+ * @param Resource $sock Socket to send command on
+ * @param string $cmd Command to run
+ *
+ * @return array Output array
+ */
+ public function run_command( $sock, $cmd ) {
+ if ( !is_resource( $sock ) ) {
+ return array();
+ }
+
+ if ( !$this->_fwrite( $sock, $cmd ) ) {
+ return array();
+ }
+
+ $ret = array();
+ while ( true ) {
+ $res = $this->_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 int $exp (optional) Expiration time. This can be a number of seconds
+ * to cache for (up to 30 days inclusive). Any timespans of 30 days + 1 second or
+ * longer must be the timestamp of the time at which the mapping should expire. It
+ * is safe to use timestamps in all cases, regardless of exipration
+ * eg: strtotime("+3 hour")
+ *
+ * @return bool True on success
+ */
+ public function set( $key, $value, $exp = 0 ) {
+ return $this->_set( 'set', $key, $value, $exp );
+ }
+
+ // }}}
+ // {{{ cas()
+
+ /**
+ * Sets a key to a given value in the memcache if the current value still corresponds
+ * to a known, given value. Returns true if set successfully.
+ *
+ * @param float $casToken Current known value
+ * @param string $key Key to set value as
+ * @param mixed $value Value to set
+ * @param int $exp (optional) Expiration time. This can be a number of seconds
+ * to cache for (up to 30 days inclusive). Any timespans of 30 days + 1 second or
+ * longer must be the timestamp of the time at which the mapping should expire. It
+ * is safe to use timestamps in all cases, regardless of exipration
+ * eg: strtotime("+3 hour")
+ *
+ * @return bool True on success
+ */
+ public function cas( $casToken, $key, $value, $exp = 0 ) {
+ return $this->_set( 'cas', $key, $value, $exp, $casToken );
+ }
+
+ // }}}
+ // {{{ set_compress_threshold()
+
+ /**
+ * Set the compression threshold
+ *
+ * @param int $thresh Threshold to compress if larger than
+ */
+ public function set_compress_threshold( $thresh ) {
+ $this->_compress_threshold = $thresh;
+ }
+
+ // }}}
+ // {{{ set_debug()
+
+ /**
+ * Set the debug flag
+ *
+ * @see __construct()
+ * @param bool $dbg True for debugging, false otherwise
+ */
+ public function set_debug( $dbg ) {
+ $this->_debug = $dbg;
+ }
+
+ // }}}
+ // {{{ set_servers()
+
+ /**
+ * Set the server list to distribute key gets and puts between
+ *
+ * @see __construct()
+ * @param array $list Array of servers to connect to
+ */
+ public 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 int $seconds Number of seconds
+ * @param int $microseconds Number of microseconds
+ */
+ 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 int $sock Socket to connect
+ * @param string $host Host:IP to connect to
+ *
+ * @return bool
+ * @access private
+ */
+ function _connect_sock( &$sock, $host ) {
+ list( $ip, $port ) = preg_split( '/:(?=\d)/', $host );
+ $sock = false;
+ $timeout = $this->_connect_timeout;
+ $errno = $errstr = null;
+ for ( $i = 0; !$sock && $i < $this->_connect_attempts; $i++ ) {
+ MediaWiki\suppressWarnings();
+ if ( $this->_persistent == 1 ) {
+ $sock = pfsockopen( $ip, $port, $errno, $errstr, $timeout );
+ } else {
+ $sock = fsockopen( $ip, $port, $errno, $errstr, $timeout );
+ }
+ MediaWiki\restoreWarnings();
+ }
+ if ( !$sock ) {
+ $this->_error_log( "Error connecting to $host: $errstr" );
+ $this->_dead_host( $host );
+ return false;
+ }
+
+ // Initialise timeout
+ stream_set_timeout( $sock, $this->_timeout_seconds, $this->_timeout_microseconds );
+
+ // If the connection was persistent, flush the read buffer in case there
+ // was a previous incomplete request on this connection
+ if ( $this->_persistent ) {
+ $this->_flush_read_buffer( $sock );
+ }
+ 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 );
+ $this->_dead_host( $host );
+ }
+
+ /**
+ * @param string $host
+ */
+ function _dead_host( $host ) {
+ $ip = explode( ':', $host )[0];
+ $this->_host_dead[$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 Resource|bool Resource on success, false on failure
+ * @access private
+ */
+ function get_sock( $key ) {
+ if ( !$this->_active ) {
+ return false;
+ }
+
+ if ( $this->_single_sock !== null ) {
+ return $this->sock_to_host( $this->_single_sock );
+ }
+
+ $hv = is_array( $key ) ? intval( $key[0] ) : $this->_hashfunc( $key );
+ if ( $this->_buckets === null ) {
+ $bu = array();
+ 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 ) ) {
+ 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 int Hash value
+ * @access private
+ */
+ function _hashfunc( $key ) {
+ # Hash function must be in [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|array $key Key to perform it on
+ * @param int $amt Amount to adjust
+ *
+ * @return int 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;
+ if ( isset( $this->stats[$cmd] ) ) {
+ $this->stats[$cmd]++;
+ } else {
+ $this->stats[$cmd] = 1;
+ }
+ if ( !$this->_fwrite( $sock, "$cmd $key $amt\r\n" ) ) {
+ return null;
+ }
+
+ $line = $this->_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
+ * @param float $casToken [optional]
+ * @return bool True for success, false for failure
+ *
+ * @access private
+ */
+ function _load_items( $sock, &$ret, &$casToken = null ) {
+ $results = array();
+
+ while ( 1 ) {
+ $decl = $this->_fgets( $sock );
+
+ if ( $decl === false ) {
+ /*
+ * If nothing can be read, something is wrong because we know exactly when
+ * to stop reading (right after "END") and we return right after that.
+ */
+ return false;
+ } elseif ( preg_match( '/^VALUE (\S+) (\d+) (\d+) (\d+)$/', $decl, $match ) ) {
+ /*
+ * Read all data returned. This can be either one or multiple values.
+ * Save all that data (in an array) to be processed later: we'll first
+ * want to continue reading until "END" before doing anything else,
+ * to make sure that we don't leave our client in a state where it's
+ * output is not yet fully read.
+ */
+ $results[] = array(
+ $match[1], // rkey
+ $match[2], // flags
+ $match[3], // len
+ $match[4], // casToken
+ $this->_fread( $sock, $match[3] + 2 ), // data
+ );
+ } elseif ( $decl == "END" ) {
+ if ( count( $results ) == 0 ) {
+ return false;
+ }
+
+ /**
+ * All data has been read, time to process the data and build
+ * meaningful return values.
+ */
+ foreach ( $results as $vars ) {
+ list( $rkey, $flags, $len, $casToken, $data ) = $vars;
+
+ if ( $data === false || substr( $data, -2 ) !== "\r\n" ) {
+ $this->_handle_error( $sock,
+ 'line ending missing from data block from $1' );
+ return false;
+ }
+ $data = substr( $data, 0, -2 );
+ $ret[$rkey] = $data;
+
+ if ( $this->_have_zlib && $flags & self::COMPRESSED ) {
+ $ret[$rkey] = gzuncompress( $ret[$rkey] );
+ }
+
+ /*
+ * This unserialize is the exact reason that we only want to
+ * process data after having read until "END" (instead of doing
+ * this right away): "unserialize" can trigger outside code:
+ * in the event that $ret[$rkey] is a serialized object,
+ * unserializing it will trigger __wakeup() if present. If that
+ * function attempted to read from memcached (while we did not
+ * yet read "END"), these 2 calls would collide.
+ */
+ if ( $flags & self::SERIALIZED ) {
+ $ret[$rkey] = unserialize( $ret[$rkey] );
+ } elseif ( $flags & self::INTVAL ) {
+ $ret[$rkey] = intval( $ret[$rkey] );
+ }
+ }
+
+ return true;
+ } else {
+ $this->_handle_error( $sock, 'Error parsing response from $1' );
+ return false;
+ }
+ }
+ }
+
+ // }}}
+ // {{{ _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 int $exp (optional) Expiration time. This can be a number of seconds
+ * to cache for (up to 30 days inclusive). Any timespans of 30 days + 1 second or
+ * longer must be the timestamp of the time at which the mapping should expire. It
+ * is safe to use timestamps in all cases, regardless of exipration
+ * eg: strtotime("+3 hour")
+ * @param float $casToken [optional]
+ *
+ * @return bool
+ * @access private
+ */
+ function _set( $cmd, $key, $val, $exp, $casToken = null ) {
+ if ( !$this->_active ) {
+ return false;
+ }
+
+ $sock = $this->get_sock( $key );
+ if ( !is_resource( $sock ) ) {
+ return false;
+ }
+
+ if ( isset( $this->stats[$cmd] ) ) {
+ $this->stats[$cmd]++;
+ } else {
+ $this->stats[$cmd] = 1;
+ }
+
+ $flags = 0;
+
+ if ( is_int( $val ) ) {
+ $flags |= self::INTVAL;
+ } elseif ( !is_scalar( $val ) ) {
+ $val = serialize( $val );
+ $flags |= self::SERIALIZED;
+ if ( $this->_debug ) {
+ $this->_debugprint( sprintf( "client: serializing data as it is not scalar" ) );
+ }
+ }
+
+ $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 - self::COMPRESSION_SAVINGS ) ) {
+ if ( $this->_debug ) {
+ $this->_debugprint( sprintf( "client: compressing data; was %d bytes is now %d bytes", $len, $c_len ) );
+ }
+ $val = $c_val;
+ $len = $c_len;
+ $flags |= self::COMPRESSED;
+ }
+ }
+
+ $command = "$cmd $key $flags $exp $len";
+ if ( $casToken ) {
+ $command .= " $casToken";
+ }
+
+ if ( !$this->_fwrite( $sock, "$command\r\n$val\r\n" ) ) {
+ return false;
+ }
+
+ $line = $this->_fgets( $sock );
+
+ if ( $this->_debug ) {
+ $this->_debugprint( sprintf( "%s %s (%s)", $cmd, $key, $line ) );
+ }
+ if ( $line === "STORED" ) {
+ return true;
+ } elseif ( $line === "NOT_STORED" && $cmd === "set" ) {
+ // "Not stored" is always used as the mcrouter response with AllAsyncRoute
+ return true;
+ }
+
+ return false;
+ }
+
+ // }}}
+ // {{{ sock_to_host()
+
+ /**
+ * Returns the socket for the host
+ *
+ * @param string $host Host:IP to get socket for
+ *
+ * @return Resource|bool 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 null;
+ }
+
+ // Do not buffer writes
+ stream_set_write_buffer( $sock, 0 );
+
+ $this->_cache_sock[$host] = $sock;
+
+ return $this->_cache_sock[$host];
+ }
+
+ /**
+ * @param string $text
+ */
+ function _debugprint( $text ) {
+ $this->_logger->debug( $text );
+ }
+
+ /**
+ * @param string $text
+ */
+ function _error_log( $text ) {
+ $this->_logger->error( "Memcached error: $text" );
+ }
+
+ /**
+ * Write to a stream. If there is an error, mark the socket dead.
+ *
+ * @param Resource $sock The socket
+ * @param string $buf The string to write
+ * @return bool True on success, false on failure
+ */
+ function _fwrite( $sock, $buf ) {
+ $bytesWritten = 0;
+ $bufSize = strlen( $buf );
+ while ( $bytesWritten < $bufSize ) {
+ $result = fwrite( $sock, $buf );
+ $data = stream_get_meta_data( $sock );
+ if ( $data['timed_out'] ) {
+ $this->_handle_error( $sock, 'timeout writing to $1' );
+ return false;
+ }
+ // Contrary to the documentation, fwrite() returns zero on error in PHP 5.3.
+ if ( $result === false || $result === 0 ) {
+ $this->_handle_error( $sock, 'error writing to $1' );
+ return false;
+ }
+ $bytesWritten += $result;
+ }
+
+ return true;
+ }
+
+ /**
+ * Handle an I/O error. Mark the socket dead and log an error.
+ *
+ * @param Resource $sock
+ * @param string $msg
+ */
+ function _handle_error( $sock, $msg ) {
+ $peer = stream_socket_get_name( $sock, true /** remote **/ );
+ if ( strval( $peer ) === '' ) {
+ $peer = array_search( $sock, $this->_cache_sock );
+ if ( $peer === false ) {
+ $peer = '[unknown host]';
+ }
+ }
+ $msg = str_replace( '$1', $peer, $msg );
+ $this->_error_log( "$msg" );
+ $this->_dead_sock( $sock );
+ }
+
+ /**
+ * Read the specified number of bytes from a stream. If there is an error,
+ * mark the socket dead.
+ *
+ * @param Resource $sock The socket
+ * @param int $len The number of bytes to read
+ * @return string|bool The string on success, false on failure.
+ */
+ function _fread( $sock, $len ) {
+ $buf = '';
+ while ( $len > 0 ) {
+ $result = fread( $sock, $len );
+ $data = stream_get_meta_data( $sock );
+ if ( $data['timed_out'] ) {
+ $this->_handle_error( $sock, 'timeout reading from $1' );
+ return false;
+ }
+ if ( $result === false ) {
+ $this->_handle_error( $sock, 'error reading buffer from $1' );
+ return false;
+ }
+ if ( $result === '' ) {
+ // This will happen if the remote end of the socket is shut down
+ $this->_handle_error( $sock, 'unexpected end of file reading from $1' );
+ return false;
+ }
+ $len -= strlen( $result );
+ $buf .= $result;
+ }
+ return $buf;
+ }
+
+ /**
+ * Read a line from a stream. If there is an error, mark the socket dead.
+ * The \r\n line ending is stripped from the response.
+ *
+ * @param Resource $sock The socket
+ * @return string|bool The string on success, false on failure
+ */
+ function _fgets( $sock ) {
+ $result = fgets( $sock );
+ // fgets() may return a partial line if there is a select timeout after
+ // a successful recv(), so we have to check for a timeout even if we
+ // got a string response.
+ $data = stream_get_meta_data( $sock );
+ if ( $data['timed_out'] ) {
+ $this->_handle_error( $sock, 'timeout reading line from $1' );
+ return false;
+ }
+ if ( $result === false ) {
+ $this->_handle_error( $sock, 'error reading line from $1' );
+ return false;
+ }
+ if ( substr( $result, -2 ) === "\r\n" ) {
+ $result = substr( $result, 0, -2 );
+ } elseif ( substr( $result, -1 ) === "\n" ) {
+ $result = substr( $result, 0, -1 );
+ } else {
+ $this->_handle_error( $sock, 'line ending missing in response from $1' );
+ return false;
+ }
+ return $result;
+ }
+
+ /**
+ * Flush the read buffer of a stream
+ * @param Resource $f
+ */
+ 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 );
+ }
+ }
+
+ // }}}
+ // }}}
+ // }}}
+}
+
+// }}}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff