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- 27.10.2014
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memory.php
001 <?php
002 /**
003 *
004 * This file is part of the phpBB Forum Software package.
005 *
006 * @copyright (c) phpBB Limited <https://www.phpbb.com>
007 * @license GNU General Public License, version 2 (GPL-2.0)
008 *
009 * For full copyright and license information, please see
010 * the docs/CREDITS.txt file.
011 *
012 */
013
014 namespace phpbb\cache\driver;
015
016 /**
017 * ACM Abstract Memory Class
018 */
019 abstract class memory extends \phpbb\cache\driver\base
020 {
021 var $key_prefix;
022
023 /**
024 * Set cache path
025 */
026 function __construct()
027 {
028 global $phpbb_root_path, $dbname, $table_prefix;
029
030 $this->cache_dir = $phpbb_root_path . 'cache/';
031 $this->key_prefix = substr(md5($dbname . $table_prefix), 0, 8) . '_';
032
033 if (!isset($this->extension) || !extension_loaded($this->extension))
034 {
035 global $acm_type;
036
037 trigger_error("Could not find required extension [{$this->extension}] for the ACM module $acm_type.", E_USER_ERROR);
038 }
039
040 if (isset($this->function) && !function_exists($this->function))
041 {
042 global $acm_type;
043
044 trigger_error("The required function [{$this->function}] is not available for the ACM module $acm_type.", E_USER_ERROR);
045 }
046 }
047
048 /**
049 * {@inheritDoc}
050 */
051 function load()
052 {
053 // grab the global cache
054 $this->vars = $this->_read('global');
055
056 if ($this->vars !== false)
057 {
058 return true;
059 }
060
061 return false;
062 }
063
064 /**
065 * {@inheritDoc}
066 */
067 function save()
068 {
069 if (!$this->is_modified)
070 {
071 return;
072 }
073
074 $this->_write('global', $this->vars, 2592000);
075
076 $this->is_modified = false;
077 }
078
079 /**
080 * {@inheritDoc}
081 */
082 function tidy()
083 {
084 // cache has auto GC, no need to have any code here :)
085
086 set_config('cache_last_gc', time(), true);
087 }
088
089 /**
090 * {@inheritDoc}
091 */
092 function get($var_name)
093 {
094 if ($var_name[0] == '_')
095 {
096 if (!$this->_exists($var_name))
097 {
098 return false;
099 }
100
101 return $this->_read($var_name);
102 }
103 else
104 {
105 return ($this->_exists($var_name)) ? $this->vars[$var_name] : false;
106 }
107 }
108
109 /**
110 * {@inheritDoc}
111 */
112 function put($var_name, $var, $ttl = 2592000)
113 {
114 if ($var_name[0] == '_')
115 {
116 $this->_write($var_name, $var, $ttl);
117 }
118 else
119 {
120 $this->vars[$var_name] = $var;
121 $this->is_modified = true;
122 }
123 }
124
125 /**
126 * {@inheritDoc}
127 */
128 function destroy($var_name, $table = '')
129 {
130 if ($var_name == 'sql' && !empty($table))
131 {
132 if (!is_array($table))
133 {
134 $table = array($table);
135 }
136
137 foreach ($table as $table_name)
138 {
139 // gives us the md5s that we want
140 $temp = $this->_read('sql_' . $table_name);
141
142 if ($temp === false)
143 {
144 continue;
145 }
146
147 // delete each query ref
148 foreach ($temp as $md5_id => $void)
149 {
150 $this->_delete('sql_' . $md5_id);
151 }
152
153 // delete the table ref
154 $this->_delete('sql_' . $table_name);
155 }
156
157 return;
158 }
159
160 if (!$this->_exists($var_name))
161 {
162 return;
163 }
164
165 if ($var_name[0] == '_')
166 {
167 $this->_delete($var_name);
168 }
169 else if (isset($this->vars[$var_name]))
170 {
171 $this->is_modified = true;
172 unset($this->vars[$var_name]);
173
174 // We save here to let the following cache hits succeed
175 $this->save();
176 }
177 }
178
179 /**
180 * {@inheritDoc}
181 */
182 function _exists($var_name)
183 {
184 if ($var_name[0] == '_')
185 {
186 return $this->_isset($var_name);
187 }
188 else
189 {
190 if (!sizeof($this->vars))
191 {
192 $this->load();
193 }
194
195 return isset($this->vars[$var_name]);
196 }
197 }
198
199 /**
200 * {@inheritDoc}
201 */
202 function sql_save(\phpbb\db\driver\driver_interface $db, $query, $query_result, $ttl)
203 {
204 // Remove extra spaces and tabs
205 $query = preg_replace('/[\n\r\s\t]+/', ' ', $query);
206 $hash = md5($query);
207
208 // determine which tables this query belongs to
209 // Some queries use backticks, namely the get_database_size() query
210 // don't check for conformity, the SQL would error and not reach here.
211 if (!preg_match_all('/(?:FROM \\(?(`?\\w+`?(?: \\w+)?(?:, ?`?\\w+`?(?: \\w+)?)*)\\)?)|(?:JOIN (`?\\w+`?(?: \\w+)?))/', $query, $regs, PREG_SET_ORDER))
212 {
213 // Bail out if the match fails.
214 return $query_result;
215 }
216
217 $tables = array();
218 foreach ($regs as $match)
219 {
220 if ($match[0][0] == 'F')
221 {
222 $tables = array_merge($tables, array_map('trim', explode(',', $match[1])));
223 }
224 else
225 {
226 $tables[] = $match[2];
227 }
228 }
229
230 foreach ($tables as $table_name)
231 {
232 // Remove backticks
233 $table_name = ($table_name[0] == '`') ? substr($table_name, 1, -1) : $table_name;
234
235 if (($pos = strpos($table_name, ' ')) !== false)
236 {
237 $table_name = substr($table_name, 0, $pos);
238 }
239
240 $temp = $this->_read('sql_' . $table_name);
241
242 if ($temp === false)
243 {
244 $temp = array();
245 }
246
247 $temp[$hash] = true;
248
249 // This must never expire
250 $this->_write('sql_' . $table_name, $temp, 0);
251 }
252
253 // store them in the right place
254 $query_id = sizeof($this->sql_rowset);
255 $this->sql_rowset[$query_id] = array();
256 $this->sql_row_pointer[$query_id] = 0;
257
258 while ($row = $db->sql_fetchrow($query_result))
259 {
260 $this->sql_rowset[$query_id][] = $row;
261 }
262 $db->sql_freeresult($query_result);
263
264 $this->_write('sql_' . $hash, $this->sql_rowset[$query_id], $ttl);
265
266 return $query_id;
267 }
268
269 /**
270 * Check if a cache var exists
271 *
272 * @access protected
273 * @param string $var Cache key
274 * @return bool True if it exists, otherwise false
275 */
276 function _isset($var)
277 {
278 // Most caches don't need to check
279 return true;
280 }
281 }
282