|
0
|
1 <?php
|
|
|
2
|
|
|
3 /**
|
|
|
4 +-----------------------------------------------------------------------+
|
|
|
5 | This file is part of the Roundcube Webmail client |
|
|
|
6 | Copyright (C) 2011-2013, The Roundcube Dev Team |
|
|
|
7 | Copyright (C) 2011-2013, Kolab Systems AG |
|
|
|
8 | |
|
|
|
9 | Licensed under the GNU General Public License version 3 or |
|
|
|
10 | any later version with exceptions for skins & plugins. |
|
|
|
11 | See the README file for a full license statement. |
|
|
|
12 | |
|
|
|
13 | PURPOSE: |
|
|
|
14 | Shared (cross-user) caching engine |
|
|
|
15 +-----------------------------------------------------------------------+
|
|
|
16 | Author: Thomas Bruederli <roundcube@gmail.com> |
|
|
|
17 | Author: Aleksander Machniak <alec@alec.pl> |
|
|
|
18 +-----------------------------------------------------------------------+
|
|
|
19 */
|
|
|
20
|
|
|
21 /**
|
|
|
22 * Interface class for accessing Roundcube shared cache
|
|
|
23 *
|
|
|
24 * @package Framework
|
|
|
25 * @subpackage Cache
|
|
|
26 * @author Thomas Bruederli <roundcube@gmail.com>
|
|
|
27 * @author Aleksander Machniak <alec@alec.pl>
|
|
|
28 */
|
|
|
29 class rcube_cache_shared
|
|
|
30 {
|
|
|
31 /**
|
|
|
32 * Instance of database handler
|
|
|
33 *
|
|
|
34 * @var rcube_db|Memcache|bool
|
|
|
35 */
|
|
|
36 private $db;
|
|
|
37 private $type;
|
|
|
38 private $prefix;
|
|
|
39 private $ttl;
|
|
|
40 private $packed;
|
|
|
41 private $index;
|
|
|
42 private $table;
|
|
|
43 private $debug;
|
|
|
44 private $index_changed = false;
|
|
|
45 private $cache = array();
|
|
|
46 private $cache_changes = array();
|
|
|
47 private $cache_sums = array();
|
|
|
48 private $max_packet = -1;
|
|
|
49
|
|
|
50
|
|
|
51 /**
|
|
|
52 * Object constructor.
|
|
|
53 *
|
|
|
54 * @param string $type Engine type ('db' or 'memcache' or 'apc')
|
|
|
55 * @param string $prefix Key name prefix
|
|
|
56 * @param string $ttl Expiration time of memcache/apc items
|
|
|
57 * @param bool $packed Enables/disabled data serialization.
|
|
|
58 * It's possible to disable data serialization if you're sure
|
|
|
59 * stored data will be always a safe string
|
|
|
60 */
|
|
|
61 function __construct($type, $prefix='', $ttl=0, $packed=true)
|
|
|
62 {
|
|
|
63 $rcube = rcube::get_instance();
|
|
|
64 $type = strtolower($type);
|
|
|
65
|
|
|
66 if ($type == 'memcache') {
|
|
|
67 $this->type = 'memcache';
|
|
|
68 $this->db = $rcube->get_memcache();
|
|
|
69 $this->debug = $rcube->config->get('memcache_debug');
|
|
|
70 }
|
|
|
71 else if ($type == 'apc') {
|
|
|
72 $this->type = 'apc';
|
|
|
73 $this->db = function_exists('apc_exists'); // APC 3.1.4 required
|
|
|
74 $this->debug = $rcube->config->get('apc_debug');
|
|
|
75 }
|
|
|
76 else {
|
|
|
77 $this->type = 'db';
|
|
|
78 $this->db = $rcube->get_dbh();
|
|
|
79 $this->table = $this->db->table_name('cache_shared', true);
|
|
|
80 }
|
|
|
81
|
|
|
82 // convert ttl string to seconds
|
|
|
83 $ttl = get_offset_sec($ttl);
|
|
|
84 if ($ttl > 2592000) $ttl = 2592000;
|
|
|
85
|
|
|
86 $this->ttl = $ttl;
|
|
|
87 $this->packed = $packed;
|
|
|
88 $this->prefix = $prefix;
|
|
|
89 }
|
|
|
90
|
|
|
91 /**
|
|
|
92 * Returns cached value.
|
|
|
93 *
|
|
|
94 * @param string $key Cache key name
|
|
|
95 *
|
|
|
96 * @return mixed Cached value
|
|
|
97 */
|
|
|
98 function get($key)
|
|
|
99 {
|
|
|
100 if (!array_key_exists($key, $this->cache)) {
|
|
|
101 return $this->read_record($key);
|
|
|
102 }
|
|
|
103
|
|
|
104 return $this->cache[$key];
|
|
|
105 }
|
|
|
106
|
|
|
107 /**
|
|
|
108 * Sets (add/update) value in cache.
|
|
|
109 *
|
|
|
110 * @param string $key Cache key name
|
|
|
111 * @param mixed $data Cache data
|
|
|
112 */
|
|
|
113 function set($key, $data)
|
|
|
114 {
|
|
|
115 $this->cache[$key] = $data;
|
|
|
116 $this->cache_changes[$key] = true;
|
|
|
117 }
|
|
|
118
|
|
|
119 /**
|
|
|
120 * Returns cached value without storing it in internal memory.
|
|
|
121 *
|
|
|
122 * @param string $key Cache key name
|
|
|
123 *
|
|
|
124 * @return mixed Cached value
|
|
|
125 */
|
|
|
126 function read($key)
|
|
|
127 {
|
|
|
128 if (array_key_exists($key, $this->cache)) {
|
|
|
129 return $this->cache[$key];
|
|
|
130 }
|
|
|
131
|
|
|
132 return $this->read_record($key, true);
|
|
|
133 }
|
|
|
134
|
|
|
135 /**
|
|
|
136 * Sets (add/update) value in cache and immediately saves
|
|
|
137 * it in the backend, no internal memory will be used.
|
|
|
138 *
|
|
|
139 * @param string $key Cache key name
|
|
|
140 * @param mixed $data Cache data
|
|
|
141 *
|
|
|
142 * @param boolean True on success, False on failure
|
|
|
143 */
|
|
|
144 function write($key, $data)
|
|
|
145 {
|
|
|
146 return $this->write_record($key, $this->serialize($data));
|
|
|
147 }
|
|
|
148
|
|
|
149 /**
|
|
|
150 * Clears the cache.
|
|
|
151 *
|
|
|
152 * @param string $key Cache key name or pattern
|
|
|
153 * @param boolean $prefix_mode Enable it to clear all keys starting
|
|
|
154 * with prefix specified in $key
|
|
|
155 */
|
|
|
156 function remove($key=null, $prefix_mode=false)
|
|
|
157 {
|
|
|
158 // Remove all keys
|
|
|
159 if ($key === null) {
|
|
|
160 $this->cache = array();
|
|
|
161 $this->cache_changes = array();
|
|
|
162 $this->cache_sums = array();
|
|
|
163 }
|
|
|
164 // Remove keys by name prefix
|
|
|
165 else if ($prefix_mode) {
|
|
|
166 foreach (array_keys($this->cache) as $k) {
|
|
|
167 if (strpos($k, $key) === 0) {
|
|
|
168 $this->cache[$k] = null;
|
|
|
169 $this->cache_changes[$k] = false;
|
|
|
170 unset($this->cache_sums[$k]);
|
|
|
171 }
|
|
|
172 }
|
|
|
173 }
|
|
|
174 // Remove one key by name
|
|
|
175 else {
|
|
|
176 $this->cache[$key] = null;
|
|
|
177 $this->cache_changes[$key] = false;
|
|
|
178 unset($this->cache_sums[$key]);
|
|
|
179 }
|
|
|
180
|
|
|
181 // Remove record(s) from the backend
|
|
|
182 $this->remove_record($key, $prefix_mode);
|
|
|
183 }
|
|
|
184
|
|
|
185 /**
|
|
|
186 * Remove cache records older than ttl
|
|
|
187 */
|
|
|
188 function expunge()
|
|
|
189 {
|
|
|
190 if ($this->type == 'db' && $this->db && $this->ttl) {
|
|
|
191 $this->db->query(
|
|
|
192 "DELETE FROM {$this->table}"
|
|
|
193 . " WHERE `cache_key` LIKE ?"
|
|
|
194 . " AND `expires` < " . $this->db->now(),
|
|
|
195 $this->prefix . '.%');
|
|
|
196 }
|
|
|
197 }
|
|
|
198
|
|
|
199 /**
|
|
|
200 * Remove expired records of all caches
|
|
|
201 */
|
|
|
202 static function gc()
|
|
|
203 {
|
|
|
204 $rcube = rcube::get_instance();
|
|
|
205 $db = $rcube->get_dbh();
|
|
|
206
|
|
|
207 $db->query("DELETE FROM " . $db->table_name('cache_shared', true) . " WHERE `expires` < " . $db->now());
|
|
|
208 }
|
|
|
209
|
|
|
210 /**
|
|
|
211 * Writes the cache back to the DB.
|
|
|
212 */
|
|
|
213 function close()
|
|
|
214 {
|
|
|
215 foreach ($this->cache as $key => $data) {
|
|
|
216 // The key has been used
|
|
|
217 if ($this->cache_changes[$key]) {
|
|
|
218 // Make sure we're not going to write unchanged data
|
|
|
219 // by comparing current md5 sum with the sum calculated on DB read
|
|
|
220 $data = $this->serialize($data);
|
|
|
221
|
|
|
222 if (!$this->cache_sums[$key] || $this->cache_sums[$key] != md5($data)) {
|
|
|
223 $this->write_record($key, $data);
|
|
|
224 }
|
|
|
225 }
|
|
|
226 }
|
|
|
227
|
|
|
228 if ($this->index_changed) {
|
|
|
229 $this->write_index();
|
|
|
230 }
|
|
|
231
|
|
|
232 // reset internal cache index, thanks to this we can force index reload
|
|
|
233 $this->index = null;
|
|
|
234 $this->index_changed = false;
|
|
|
235 $this->cache = array();
|
|
|
236 $this->cache_sums = array();
|
|
|
237 $this->cache_changes = array();
|
|
|
238 }
|
|
|
239
|
|
|
240 /**
|
|
|
241 * Reads cache entry.
|
|
|
242 *
|
|
|
243 * @param string $key Cache key name
|
|
|
244 * @param boolean $nostore Enable to skip in-memory store
|
|
|
245 *
|
|
|
246 * @return mixed Cached value
|
|
|
247 */
|
|
|
248 private function read_record($key, $nostore=false)
|
|
|
249 {
|
|
|
250 if (!$this->db) {
|
|
|
251 return null;
|
|
|
252 }
|
|
|
253
|
|
|
254 if ($this->type != 'db') {
|
|
|
255 $this->load_index();
|
|
|
256
|
|
|
257 // Consistency check (#1490390)
|
|
|
258 if (!in_array($key, $this->index)) {
|
|
|
259 // we always check if the key exist in the index
|
|
|
260 // to have data in consistent state. Keeping the index consistent
|
|
|
261 // is needed for keys delete operation when we delete all keys or by prefix.
|
|
|
262 }
|
|
|
263 else {
|
|
|
264 $ckey = $this->ckey($key);
|
|
|
265
|
|
|
266 if ($this->type == 'memcache') {
|
|
|
267 $data = $this->db->get($ckey);
|
|
|
268 }
|
|
|
269 else if ($this->type == 'apc') {
|
|
|
270 $data = apc_fetch($ckey);
|
|
|
271 }
|
|
|
272
|
|
|
273 if ($this->debug) {
|
|
|
274 $this->debug('get', $ckey, $data);
|
|
|
275 }
|
|
|
276 }
|
|
|
277
|
|
|
278 if ($data !== false) {
|
|
|
279 $md5sum = md5($data);
|
|
|
280 $data = $this->unserialize($data);
|
|
|
281
|
|
|
282 if ($nostore) {
|
|
|
283 return $data;
|
|
|
284 }
|
|
|
285
|
|
|
286 $this->cache_sums[$key] = $md5sum;
|
|
|
287 $this->cache[$key] = $data;
|
|
|
288 }
|
|
|
289 else {
|
|
|
290 $this->cache[$key] = null;
|
|
|
291 }
|
|
|
292 }
|
|
|
293 else {
|
|
|
294 $sql_result = $this->db->query(
|
|
|
295 "SELECT `data`, `cache_key` FROM {$this->table}"
|
|
|
296 . " WHERE `cache_key` = ?",
|
|
|
297 $this->prefix . '.' . $key);
|
|
|
298
|
|
|
299 if ($sql_arr = $this->db->fetch_assoc($sql_result)) {
|
|
|
300 if (strlen($sql_arr['data']) > 0) {
|
|
|
301 $md5sum = md5($sql_arr['data']);
|
|
|
302 $data = $this->unserialize($sql_arr['data']);
|
|
|
303 }
|
|
|
304
|
|
|
305 $this->db->reset();
|
|
|
306
|
|
|
307 if ($nostore) {
|
|
|
308 return $data;
|
|
|
309 }
|
|
|
310
|
|
|
311 $this->cache[$key] = $data;
|
|
|
312 $this->cache_sums[$key] = $md5sum;
|
|
|
313 }
|
|
|
314 else {
|
|
|
315 $this->cache[$key] = null;
|
|
|
316 }
|
|
|
317 }
|
|
|
318
|
|
|
319 return $this->cache[$key];
|
|
|
320 }
|
|
|
321
|
|
|
322 /**
|
|
|
323 * Writes single cache record into DB.
|
|
|
324 *
|
|
|
325 * @param string $key Cache key name
|
|
|
326 * @param mixed $data Serialized cache data
|
|
|
327 *
|
|
|
328 * @param boolean True on success, False on failure
|
|
|
329 */
|
|
|
330 private function write_record($key, $data)
|
|
|
331 {
|
|
|
332 if (!$this->db) {
|
|
|
333 return false;
|
|
|
334 }
|
|
|
335
|
|
|
336 // don't attempt to write too big data sets
|
|
|
337 if (strlen($data) > $this->max_packet_size()) {
|
|
|
338 trigger_error("rcube_cache: max_packet_size ($this->max_packet) exceeded for key $key. Tried to write " . strlen($data) . " bytes", E_USER_WARNING);
|
|
|
339 return false;
|
|
|
340 }
|
|
|
341
|
|
|
342 if ($this->type == 'memcache' || $this->type == 'apc') {
|
|
|
343 $result = $this->add_record($this->ckey($key), $data);
|
|
|
344
|
|
|
345 // make sure index will be updated
|
|
|
346 if ($result) {
|
|
|
347 if (!array_key_exists($key, $this->cache_sums)) {
|
|
|
348 $this->cache_sums[$key] = true;
|
|
|
349 }
|
|
|
350
|
|
|
351 $this->load_index();
|
|
|
352
|
|
|
353 if (!$this->index_changed && !in_array($key, $this->index)) {
|
|
|
354 $this->index_changed = true;
|
|
|
355 }
|
|
|
356 }
|
|
|
357
|
|
|
358 return $result;
|
|
|
359 }
|
|
|
360
|
|
|
361 $db_key = $this->prefix . '.' . $key;
|
|
|
362
|
|
|
363 // Remove NULL rows (here we don't need to check if the record exist)
|
|
|
364 if ($data == 'N;') {
|
|
|
365 $result = $this->db->query("DELETE FROM {$this->table} WHERE `cache_key` = ?", $db_key);
|
|
|
366
|
|
|
367 return !$this->db->is_error($result);
|
|
|
368 }
|
|
|
369
|
|
|
370 $key_exists = array_key_exists($key, $this->cache_sums);
|
|
|
371 $expires = $this->ttl ? $this->db->now($this->ttl) : 'NULL';
|
|
|
372
|
|
|
373 if (!$key_exists) {
|
|
|
374 // Try INSERT temporarily ignoring "duplicate key" errors
|
|
|
375 $this->db->set_option('ignore_key_errors', true);
|
|
|
376
|
|
|
377 $result = $this->db->query(
|
|
|
378 "INSERT INTO {$this->table} (`expires`, `cache_key`, `data`)"
|
|
|
379 . " VALUES ($expires, ?, ?)",
|
|
|
380 $db_key, $data);
|
|
|
381
|
|
|
382 $this->db->set_option('ignore_key_errors', false);
|
|
|
383 }
|
|
|
384
|
|
|
385 // otherwise try UPDATE
|
|
|
386 if (!isset($result) || !($count = $this->db->affected_rows($result))) {
|
|
|
387 $result = $this->db->query(
|
|
|
388 "UPDATE {$this->table} SET `expires` = $expires, `data` = ?"
|
|
|
389 . " WHERE `cache_key` = ?",
|
|
|
390 $data, $db_key);
|
|
|
391
|
|
|
392 $count = $this->db->affected_rows($result);
|
|
|
393 }
|
|
|
394
|
|
|
395 return $count > 0;
|
|
|
396 }
|
|
|
397
|
|
|
398 /**
|
|
|
399 * Deletes the cache record(s).
|
|
|
400 *
|
|
|
401 * @param string $key Cache key name or pattern
|
|
|
402 * @param boolean $prefix_mode Enable it to clear all keys starting
|
|
|
403 * with prefix specified in $key
|
|
|
404 */
|
|
|
405 private function remove_record($key=null, $prefix_mode=false)
|
|
|
406 {
|
|
|
407 if (!$this->db) {
|
|
|
408 return;
|
|
|
409 }
|
|
|
410
|
|
|
411 if ($this->type != 'db') {
|
|
|
412 $this->load_index();
|
|
|
413
|
|
|
414 // Remove all keys
|
|
|
415 if ($key === null) {
|
|
|
416 foreach ($this->index as $key) {
|
|
|
417 $this->delete_record($this->ckey($key));
|
|
|
418 }
|
|
|
419
|
|
|
420 $this->index = array();
|
|
|
421 }
|
|
|
422 // Remove keys by name prefix
|
|
|
423 else if ($prefix_mode) {
|
|
|
424 foreach ($this->index as $idx => $k) {
|
|
|
425 if (strpos($k, $key) === 0) {
|
|
|
426 $this->delete_record($this->ckey($k));
|
|
|
427 unset($this->index[$idx]);
|
|
|
428 }
|
|
|
429 }
|
|
|
430 }
|
|
|
431 // Remove one key by name
|
|
|
432 else {
|
|
|
433 $this->delete_record($this->ckey($key));
|
|
|
434 if (($idx = array_search($key, $this->index)) !== false) {
|
|
|
435 unset($this->index[$idx]);
|
|
|
436 }
|
|
|
437 }
|
|
|
438
|
|
|
439 $this->index_changed = true;
|
|
|
440
|
|
|
441 return;
|
|
|
442 }
|
|
|
443
|
|
|
444 // Remove all keys (in specified cache)
|
|
|
445 if ($key === null) {
|
|
|
446 $where = " WHERE `cache_key` LIKE " . $this->db->quote($this->prefix.'.%');
|
|
|
447 }
|
|
|
448 // Remove keys by name prefix
|
|
|
449 else if ($prefix_mode) {
|
|
|
450 $where = " WHERE `cache_key` LIKE " . $this->db->quote($this->prefix.'.'.$key.'%');
|
|
|
451 }
|
|
|
452 // Remove one key by name
|
|
|
453 else {
|
|
|
454 $where = " WHERE `cache_key` = " . $this->db->quote($this->prefix.'.'.$key);
|
|
|
455 }
|
|
|
456
|
|
|
457 $this->db->query("DELETE FROM " . $this->table . $where);
|
|
|
458 }
|
|
|
459
|
|
|
460 /**
|
|
|
461 * Adds entry into memcache/apc DB.
|
|
|
462 *
|
|
|
463 * @param string $key Cache internal key name
|
|
|
464 * @param mixed $data Serialized cache data
|
|
|
465 *
|
|
|
466 * @param boolean True on success, False on failure
|
|
|
467 */
|
|
|
468 private function add_record($key, $data)
|
|
|
469 {
|
|
|
470 if ($this->type == 'memcache') {
|
|
|
471 $result = $this->db->replace($key, $data, MEMCACHE_COMPRESSED, $this->ttl);
|
|
|
472
|
|
|
473 if (!$result) {
|
|
|
474 $result = $this->db->set($key, $data, MEMCACHE_COMPRESSED, $this->ttl);
|
|
|
475 }
|
|
|
476 }
|
|
|
477 else if ($this->type == 'apc') {
|
|
|
478 if (apc_exists($key)) {
|
|
|
479 apc_delete($key);
|
|
|
480 }
|
|
|
481
|
|
|
482 $result = apc_store($key, $data, $this->ttl);
|
|
|
483 }
|
|
|
484
|
|
|
485 if ($this->debug) {
|
|
|
486 $this->debug('set', $key, $data, $result);
|
|
|
487 }
|
|
|
488
|
|
|
489 return $result;
|
|
|
490 }
|
|
|
491
|
|
|
492 /**
|
|
|
493 * Deletes entry from memcache/apc DB.
|
|
|
494 *
|
|
|
495 * @param string $key Cache internal key name
|
|
|
496 *
|
|
|
497 * @param boolean True on success, False on failure
|
|
|
498 */
|
|
|
499 private function delete_record($key)
|
|
|
500 {
|
|
|
501 if ($this->type == 'memcache') {
|
|
|
502 // #1488592: use 2nd argument
|
|
|
503 $result = $this->db->delete($key, 0);
|
|
|
504 }
|
|
|
505 else {
|
|
|
506 $result = apc_delete($key);
|
|
|
507 }
|
|
|
508
|
|
|
509 if ($this->debug) {
|
|
|
510 $this->debug('delete', $key, null, $result);
|
|
|
511 }
|
|
|
512
|
|
|
513 return $result;
|
|
|
514 }
|
|
|
515
|
|
|
516 /**
|
|
|
517 * Writes the index entry into memcache/apc DB.
|
|
|
518 */
|
|
|
519 private function write_index()
|
|
|
520 {
|
|
|
521 if (!$this->db || $this->type == 'db') {
|
|
|
522 return;
|
|
|
523 }
|
|
|
524
|
|
|
525 $this->load_index();
|
|
|
526
|
|
|
527 // Make sure index contains new keys
|
|
|
528 foreach ($this->cache as $key => $value) {
|
|
|
529 if ($value !== null && !in_array($key, $this->index)) {
|
|
|
530 $this->index[] = $key;
|
|
|
531 }
|
|
|
532 }
|
|
|
533
|
|
|
534 // new keys added using self::write()
|
|
|
535 foreach ($this->cache_sums as $key => $value) {
|
|
|
536 if ($value === true && !in_array($key, $this->index)) {
|
|
|
537 $this->index[] = $key;
|
|
|
538 }
|
|
|
539 }
|
|
|
540
|
|
|
541 $data = serialize($this->index);
|
|
|
542 $this->add_record($this->ikey(), $data);
|
|
|
543 }
|
|
|
544
|
|
|
545 /**
|
|
|
546 * Gets the index entry from memcache/apc DB.
|
|
|
547 */
|
|
|
548 private function load_index()
|
|
|
549 {
|
|
|
550 if (!$this->db || $this->type == 'db') {
|
|
|
551 return;
|
|
|
552 }
|
|
|
553
|
|
|
554 if ($this->index !== null) {
|
|
|
555 return;
|
|
|
556 }
|
|
|
557
|
|
|
558 $index_key = $this->ikey();
|
|
|
559
|
|
|
560 if ($this->type == 'memcache') {
|
|
|
561 $data = $this->db->get($index_key);
|
|
|
562 }
|
|
|
563 else if ($this->type == 'apc') {
|
|
|
564 $data = apc_fetch($index_key);
|
|
|
565 }
|
|
|
566
|
|
|
567 if ($this->debug) {
|
|
|
568 $this->debug('get', $index_key, $data);
|
|
|
569 }
|
|
|
570
|
|
|
571 $this->index = $data ? unserialize($data) : array();
|
|
|
572 }
|
|
|
573
|
|
|
574 /**
|
|
|
575 * Creates cache key name (for memcache and apc)
|
|
|
576 *
|
|
|
577 * @param string $key Cache key name
|
|
|
578 *
|
|
|
579 * @return string Cache key
|
|
|
580 */
|
|
|
581 private function ckey($key)
|
|
|
582 {
|
|
|
583 return $this->prefix . ':' . $key;
|
|
|
584 }
|
|
|
585
|
|
|
586 /**
|
|
|
587 * Creates index cache key name (for memcache and apc)
|
|
|
588 *
|
|
|
589 * @return string Cache key
|
|
|
590 */
|
|
|
591 private function ikey()
|
|
|
592 {
|
|
|
593 // This way each cache will have its own index
|
|
|
594 return $this->prefix . 'INDEX';
|
|
|
595 }
|
|
|
596
|
|
|
597 /**
|
|
|
598 * Serializes data for storing
|
|
|
599 */
|
|
|
600 private function serialize($data)
|
|
|
601 {
|
|
|
602 if ($this->type == 'db') {
|
|
|
603 return $this->db->encode($data, $this->packed);
|
|
|
604 }
|
|
|
605
|
|
|
606 return $this->packed ? serialize($data) : $data;
|
|
|
607 }
|
|
|
608
|
|
|
609 /**
|
|
|
610 * Unserializes serialized data
|
|
|
611 */
|
|
|
612 private function unserialize($data)
|
|
|
613 {
|
|
|
614 if ($this->type == 'db') {
|
|
|
615 return $this->db->decode($data, $this->packed);
|
|
|
616 }
|
|
|
617
|
|
|
618 return $this->packed ? @unserialize($data) : $data;
|
|
|
619 }
|
|
|
620
|
|
|
621 /**
|
|
|
622 * Determine the maximum size for cache data to be written
|
|
|
623 */
|
|
|
624 private function max_packet_size()
|
|
|
625 {
|
|
|
626 if ($this->max_packet < 0) {
|
|
|
627 $this->max_packet = 2097152; // default/max is 2 MB
|
|
|
628
|
|
|
629 if ($this->type == 'db') {
|
|
|
630 if ($value = $this->db->get_variable('max_allowed_packet', $this->max_packet)) {
|
|
|
631 $this->max_packet = $value;
|
|
|
632 }
|
|
|
633 $this->max_packet -= 2000;
|
|
|
634 }
|
|
|
635 else {
|
|
|
636 $max_packet = rcube::get_instance()->config->get($this->type . '_max_allowed_packet');
|
|
|
637 $this->max_packet = parse_bytes($max_packet) ?: $this->max_packet;
|
|
|
638 }
|
|
|
639 }
|
|
|
640
|
|
|
641 return $this->max_packet;
|
|
|
642 }
|
|
|
643
|
|
|
644 /**
|
|
|
645 * Write memcache/apc debug info to the log
|
|
|
646 */
|
|
|
647 private function debug($type, $key, $data = null, $result = null)
|
|
|
648 {
|
|
|
649 $line = strtoupper($type) . ' ' . $key;
|
|
|
650
|
|
|
651 if ($data !== null) {
|
|
|
652 $line .= ' ' . ($this->packed ? $data : serialize($data));
|
|
|
653 }
|
|
|
654
|
|
|
655 rcube::debug($this->type, $line, $result);
|
|
|
656 }
|
|
|
657 }
|
