1 | <?php |
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2 | |
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3 | // security - hide paths |
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4 | if (!defined('ADODB_DIR')) die(); |
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5 | |
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6 | global $ADODB_INCLUDED_MEMCACHE; |
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7 | $ADODB_INCLUDED_MEMCACHE = 1; |
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8 | |
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9 | global $ADODB_INCLUDED_CSV; |
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10 | if (empty($ADODB_INCLUDED_CSV)) include(ADODB_DIR.'/adodb-csvlib.inc.php'); |
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11 | |
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12 | /* |
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13 | |
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14 | V5.18 3 Sep 2012 (c) 2000-2012 John Lim (jlim#natsoft.com). All rights reserved. |
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15 | Released under both BSD license and Lesser GPL library license. |
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16 | Whenever there is any discrepancy between the two licenses, |
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17 | the BSD license will take precedence. See License.txt. |
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18 | Set tabs to 4 for best viewing. |
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19 | |
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20 | Latest version is available at http://adodb.sourceforge.net |
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21 | |
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22 | Usage: |
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23 | |
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24 | $db = NewADOConnection($driver); |
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25 | $db->memCache = true; /// should we use memCache instead of caching in files |
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26 | $db->memCacheHost = array($ip1, $ip2, $ip3); |
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27 | $db->memCachePort = 11211; /// this is default memCache port |
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28 | $db->memCacheCompress = false; /// Use 'true' to store the item compressed (uses zlib) |
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29 | |
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30 | $db->Connect(...); |
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31 | $db->CacheExecute($sql); |
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32 | |
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33 | Note the memcache class is shared by all connections, is created during the first call to Connect/PConnect. |
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34 | |
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35 | Class instance is stored in $ADODB_CACHE |
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36 | */ |
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37 | |
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38 | class ADODB_Cache_MemCache { |
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39 | var $createdir = false; // create caching directory structure? |
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40 | |
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41 | //----------------------------- |
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42 | // memcache specific variables |
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43 | |
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44 | var $hosts; // array of hosts |
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45 | var $port = 11211; |
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46 | var $compress = false; // memcache compression with zlib |
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47 | |
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48 | var $_connected = false; |
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49 | var $_memcache = false; |
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50 | |
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51 | function ADODB_Cache_MemCache(&$obj) |
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52 | { |
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53 | $this->hosts = $obj->memCacheHost; |
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54 | $this->port = $obj->memCachePort; |
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55 | $this->compress = $obj->memCacheCompress; |
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56 | } |
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57 | |
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58 | // implement as lazy connection. The connection only occurs on CacheExecute call |
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59 | function connect(&$err) |
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60 | { |
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61 | if (!function_exists('memcache_pconnect')) { |
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62 | $err = 'Memcache module PECL extension not found!'; |
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63 | return false; |
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64 | } |
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65 | |
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66 | $memcache = new MemCache; |
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67 | |
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68 | if (!is_array($this->hosts)) $this->hosts = array($this->hosts); |
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69 | |
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70 | $failcnt = 0; |
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71 | foreach($this->hosts as $host) { |
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72 | if (!@$memcache->addServer($host,$this->port,true)) { |
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73 | $failcnt += 1; |
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74 | } |
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75 | } |
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76 | if ($failcnt == sizeof($this->hosts)) { |
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77 | $err = 'Can\'t connect to any memcache server'; |
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78 | return false; |
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79 | } |
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80 | $this->_connected = true; |
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81 | $this->_memcache = $memcache; |
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82 | return true; |
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83 | } |
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84 | |
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85 | // returns true or false. true if successful save |
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86 | function writecache($filename, $contents, $debug, $secs2cache) |
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87 | { |
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88 | if (!$this->_connected) { |
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89 | $err = ''; |
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90 | if (!$this->connect($err) && $debug) ADOConnection::outp($err); |
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91 | } |
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92 | if (!$this->_memcache) return false; |
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93 | |
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94 | if (!$this->_memcache->set($filename, $contents, $this->compress ? MEMCACHE_COMPRESSED : 0, $secs2cache)) { |
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95 | if ($debug) ADOConnection::outp(" Failed to save data at the memcached server!<br>\n"); |
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96 | return false; |
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97 | } |
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98 | |
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99 | return true; |
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100 | } |
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101 | |
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102 | // returns a recordset |
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103 | function readcache($filename, &$err, $secs2cache, $rsClass) |
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104 | { |
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105 | $false = false; |
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106 | if (!$this->_connected) $this->connect($err); |
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107 | if (!$this->_memcache) return $false; |
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108 | |
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109 | $rs = $this->_memcache->get($filename); |
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110 | if (!$rs) { |
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111 | $err = 'Item with such key doesn\'t exists on the memcached server.'; |
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112 | return $false; |
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113 | } |
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114 | |
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115 | // hack, should actually use _csv2rs |
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116 | $rs = explode("\n", $rs); |
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117 | unset($rs[0]); |
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118 | $rs = join("\n", $rs); |
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119 | $rs = unserialize($rs); |
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120 | if (! is_object($rs)) { |
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121 | $err = 'Unable to unserialize $rs'; |
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122 | return $false; |
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123 | } |
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124 | if ($rs->timeCreated == 0) return $rs; // apparently have been reports that timeCreated was set to 0 somewhere |
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125 | |
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126 | $tdiff = intval($rs->timeCreated+$secs2cache - time()); |
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127 | if ($tdiff <= 2) { |
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128 | switch($tdiff) { |
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129 | case 2: |
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130 | if ((rand() & 15) == 0) { |
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131 | $err = "Timeout 2"; |
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132 | return $false; |
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133 | } |
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134 | break; |
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135 | case 1: |
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136 | if ((rand() & 3) == 0) { |
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137 | $err = "Timeout 1"; |
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138 | return $false; |
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139 | } |
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140 | break; |
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141 | default: |
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142 | $err = "Timeout 0"; |
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143 | return $false; |
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144 | } |
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145 | } |
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146 | return $rs; |
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147 | } |
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148 | |
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149 | function flushall($debug=false) |
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150 | { |
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151 | if (!$this->_connected) { |
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152 | $err = ''; |
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153 | if (!$this->connect($err) && $debug) ADOConnection::outp($err); |
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154 | } |
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155 | if (!$this->_memcache) return false; |
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156 | |
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157 | $del = $this->_memcache->flush(); |
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158 | |
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159 | if ($debug) |
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160 | if (!$del) ADOConnection::outp("flushall: failed!<br>\n"); |
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161 | else ADOConnection::outp("flushall: succeeded!<br>\n"); |
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162 | |
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163 | return $del; |
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164 | } |
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165 | |
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166 | function flushcache($filename, $debug=false) |
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167 | { |
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168 | if (!$this->_connected) { |
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169 | $err = ''; |
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170 | if (!$this->connect($err) && $debug) ADOConnection::outp($err); |
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171 | } |
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172 | if (!$this->_memcache) return false; |
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173 | |
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174 | $del = $this->_memcache->delete($filename); |
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175 | |
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176 | if ($debug) |
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177 | if (!$del) ADOConnection::outp("flushcache: $key entry doesn't exist on memcached server!<br>\n"); |
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178 | else ADOConnection::outp("flushcache: $key entry flushed from memcached server!<br>\n"); |
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179 | |
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180 | return $del; |
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181 | } |
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182 | |
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183 | // not used for memcache |
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184 | function createdir($dir, $hash) |
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185 | { |
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186 | return true; |
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187 | } |
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188 | } |
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189 | |
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190 | ?> |
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