sqlite-object-cache / includes / class-sqlite-object-cache.php

class-sqlite-object-cache.php in SQLite Object Cache 1.3.6, at includes/class-sqlite-object-cache.php

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1	<?php
2	/**
3	* Main plugin class file.
4	*
5	* @package WordPress Plugin Template/Includes
6	*/
7
8	if ( ! defined( 'ABSPATH' ) ) {
9	exit;
10	}
11
12	/**
13	* Main plugin class.
14	*
15	* Only make one instance of this, please.
16	*/
17	class SQLite_Object_Cache {
18	const CLEAN_EVENT_HOOK = 'sqlite_object_cache_clean';
19
20	/**
21	* Local instance of SQLite_Object_Cache_Admin_API
22	*
23	* @var SQLite_Object_Cache_Admin_API\|null
24	*/
25	public $admin;
26
27	/**
28	* Settings class object
29	*
30	* @var object
31	* @access public
32	* @since 1.0.0
33	*/
34	public $settings;
35
36	/**
37	* The version number.
38	*
39	* @var string
40	* @access public
41	* @since 1.0.0
42	*/
43	public $_version;
44
45	/**
46	* The token.
47	*
48	* @var string
49	* @access public
50	* @since 1.0.0
51	*/
52	public $_token;
53
54	/**
55	* The main plugin file.
56	*
57	* @var string
58	* @access public
59	* @since 1.0.0
60	*/
61	public $file;
62
63	/**
64	* The main plugin directory.
65	*
66	* @var string
67	* @access public
68	* @since 1.0.0
69	*/
70	public $dir;
71
72	/**
73	* The plugin assets directory.
74	*
75	* @var string
76	* @access public
77	* @since 1.0.0
78	*/
79	public $assets_dir;
80
81	/**
82	* The plugin assets URL.
83	*
84	* @var string
85	* @access public
86	* @since 1.0.0
87	*/
88	public $assets_url;
89
90	/**
91	* Suffix for JavaScripts.
92	*
93	* @var string
94	* @access public
95	* @since 1.0.0
96	*/
97	public $script_suffix;
98
99	/**
100	* Path for the drop-in when it is working.
101	* @var string
102	*/
103	public $dropinfiledest;
104
105	/**
106	* Path for the drop-in in the plugin tree.
107	* @var string
108	*/
109	public $dropinfilesource;
110
111	/**
112	* Minimum required sqlite version.
113	*
114	* @var string
115	*/
116	public $minimum_sqlite_version = '3.7.0';
117
118	/**
119	* Constructor funtion.
120	*
121	* @param string $file File constructor.
122	* @param string $version Plugin version.
123	*/
124	public function __construct( $file = '', $version = '1.3.6' ) {
125	$this->_version = $version;
126	$this->_token = 'sqlite_object_cache';
127
128	// Load plugin environment variables.
129	$this->file = $file;
130	$this->dir =
131	trailingslashit( dirname( WP_CONTENT_DIR . '/plugins/' . plugin_basename( $this->file ) ) );
132	$this->assets_dir = trailingslashit( $this->dir . 'assets' );
133	$this->dropinfilesource = $this->assets_dir . 'drop-in/object-cache.php';
134	$this->dropinfiledest = trailingslashit( WP_CONTENT_DIR ) . 'object-cache.php';
135
136	$this->assets_url = esc_url( trailingslashit( plugins_url( '/assets/', $this->file ) ) );
137
138	$this->script_suffix = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';
139
140	register_activation_hook( $this->file, array( $this, 'on_activation' ) );
141	register_deactivation_hook( $this->file, array( $this, 'on_deactivation' ) );
142
143	if ( is_admin() ) {
144	// Load API for generic admin functions.
145	$this->admin = new SQLite_Object_Cache_Admin_API();
146	// Suppress backups
147	new SQLite_Backup_Exclusion();
148	}
149
150	// Handle localization.
151	$this->load_plugin_textdomain();
152	add_action( 'admin-init', array( $this, 'load_localization' ), 0 );
153	add_action( 'admin_init', array( $this, 'maybe_update_dropin' ) );
154
155	/* handle cron cache cleanup */
156	add_action( self::CLEAN_EVENT_HOOK, array( $this, 'clean_job' ), 10, 0 );
157	if ( ! wp_next_scheduled( self::CLEAN_EVENT_HOOK ) ) {
158	wp_schedule_event( time() + HOUR_IN_SECONDS, 'hourly', self::CLEAN_EVENT_HOOK );
159	}
160	/* Handle probabilistic non-cron cleanup, one request in 2000. */
161	if ( 1 === rand( 1, 2000 ) ) {
162	add_action( 'shutdown', function () {
163	$this->clean_job( 1.25 );
164	}, 999, 0 );
165	}
166	}
167
168	/**
169	* Load plugin textdomain
170	*
171	* @access public
172	* @return void
173	* @since 1.0.0
174	*/
175	public function load_plugin_textdomain() {
176	$domain = 'sqlite-object-cache';
177
178	$locale = apply_filters( 'plugin_locale', get_locale(), $domain );
179
180	load_textdomain( $domain, WP_LANG_DIR . '/' . $domain . '/' . $domain . '-' . $locale . '.mo' );
181	load_plugin_textdomain( $domain, false, dirname( plugin_basename( $this->file ) ) . '/languages/' );
182	}
183
184	/**
185	* WP_Cron task to clean cache entries.
186	*
187	* @param float $grace_factor Default 1.0
188	*
189	* @return void
190	*/
191	public function clean_job( $grace_factor = 1.0 ) {
192	$option = get_option( $this->_token . '_settings', array() );
193	$target_size = empty ( $option['target_size'] ) ? 16 : $option['target_size'];
194	$target_size = ( 1024 1024 );
195	$threshold_size = (int) ( $target_size * $grace_factor );
196
197	global $wp_object_cache;
198	if ( ! method_exists( $wp_object_cache, 'sqlite_get_size' ) ) {
199	return;
200	}
201	$current_size = $wp_object_cache->sqlite_get_size();
202	/* Skip this if the current size is small enough. */
203	if ( $current_size <= $threshold_size ) {
204	return;
205	}
206
207	/* Remove expired items (transients mostly). */
208	if ( $wp_object_cache->sqlite_remove_expired( ) ) {
209	/* If anything was removed, get the size again. */
210	$current_size = $wp_object_cache->sqlite_get_size();
211	}
212
213	/* Skip this if the size is small enough, after removing expired items. */
214	if ( $current_size <= $threshold_size ) {
215	return;
216	}
217
218	/* Clean up old statistics. */
219	$retention = empty ( $option['retention'] ) ? 24 : $option['retention'];
220	$wp_object_cache->sqlite_reset_statistics( $retention * HOUR_IN_SECONDS );
221
222	/* Delete the least-recently-updated items to get to the target size. */
223	$wp_object_cache->sqlite_delete_old( $target_size, $current_size );
224	}
225
226	/**
227	* Plugin activation hook
228	*
229	* @return void
230	*/
231	public
232	function on_activation() {
233	/* make sure the autoloaded option is set when activating; avoid an extra dbms or cache hit to fetch it */
234	$option = get_option( $this->_token . '_settings', 'default' );
235	if ( 'default' === $option ) {
236	update_option( $this->_token . '_settings', array(), true );
237	}
238	if ( true === $this->has_sqlite() ) {
239	add_action( 'shutdown', array( $this, 'update_dropin' ) );
240	}
241	}
242
243	/**
244	* Determine whether we can use SQLite3.
245	*
246	* @return bool\|string true, or an error message.
247	*/
248	public
249	function has_sqlite() {
250	if ( ! class_exists( 'SQLite3' ) \|\| ! extension_loaded( 'sqlite3' ) ) {
251	return __( 'You cannot use the SQLite Object Cache plugin. Your server does not have php\'s SQLite3 extension installed.', 'sqlite-object-cache' );
252	}
253
254	$sqlite_version = $this->sqlite_get_version();
255	if ( version_compare( $sqlite_version, $this->minimum_sqlite_version ) < 0 ) {
256	return sprintf(
257	/* translators: 1 actual SQLite version. 2 required SQLite version) */
258	__( 'You cannot use the SQLite Object Cache plugin. Your server only offers SQLite3 version %1$s, but at least %2$s is required.', 'sqlite-object-cache' ),
259	$sqlite_version, $this->minimum_sqlite_version );
260	}
261
262	return true;
263	}
264
265	/**
266	* Get the version number for the SQLite extension.
267	*
268	* @return string\|false SQLite's version number.
269	*/
270	public
271	function sqlite_get_version() {
272
273	if ( class_exists( 'SQLite3' ) ) {
274	$version = SQLite3::version();
275
276	return $version['versionString'];
277	}
278
279	return false;
280	}
281
282	/**
283	* Load plugin localization
284	*
285	* @access public
286	* @return void
287	* @since 1.0.0
288	*/
289	public
290	function load_localization() {
291	load_plugin_textdomain( 'sqlite-object-cache', false, dirname( plugin_basename( $this->file ) ) . '/languages/' );
292	}
293
294	/**
295	* Test if we can write in the WP_CONTENT_DIR and modify the `object-cache.php` drop-in
296	*
297	* @return true\|WP_Error
298	* @author Till Krüss
299	*
300	*/
301	public
302	function test_filesystem_writing() {
303	global $wp_filesystem;
304
305	if ( ! $this->initialize_filesystem( '', true ) ) {
306	return new WP_Error( 'fs', __( 'Could not initialize filesystem.', 'sqlite-object-cache' ) );
307	}
308
309	$testfiledest = WP_CONTENT_DIR . '/sqlite-write-test.tmp';
310
311	if ( ! $wp_filesystem->exists( $this->dropinfilesource ) ) {
312	return new WP_Error( 'exists', __( 'Object cache drop-in file doesn’t exist.', 'sqlite-object-cache' ) );
313	}
314
315	if ( $wp_filesystem->exists( $testfiledest ) && ! $wp_filesystem->delete( $testfiledest ) ) {
316	return new WP_Error( 'delete', __( 'Test file exists, but couldn’t be deleted.', 'sqlite-object-cache' ) );
317	}
318
319	if ( ! $wp_filesystem->is_writable( WP_CONTENT_DIR ) ) {
320	return new WP_Error( 'copy', __( 'Content directory is not writable.', 'sqlite-object-cache' ) );
321	}
322
323	if ( ! $wp_filesystem->copy( $this->dropinfilesource, $testfiledest, true, FS_CHMOD_FILE ) ) {
324	return new WP_Error( 'copy', __( 'Failed to copy test file.', 'sqlite-object-cache' ) );
325	}
326
327	if ( ! $wp_filesystem->exists( $testfiledest ) ) {
328	return new WP_Error( 'exists', __( 'Copied test file doesn’t exist.', 'sqlite-object-cache' ) );
329	}
330
331	$meta = get_file_data( $testfiledest, array( 'Version' => 'Version' ) );
332
333	if ( $meta['Version'] !== $this->_version ) {
334	return new WP_Error( 'version', __( 'Couldn’t verify test file contents.', 'sqlite-object-cache' ) );
335	}
336
337	if ( ! $wp_filesystem->delete( $testfiledest ) ) {
338	return new WP_Error( 'delete', __( 'Copied test file couldn’t be deleted.', 'sqlite-object-cache' ) );
339	}
340
341	return true;
342	}
343
344	/**
345	* Initializes the WP filesystem API to be ready for use
346	*
347	* @param string $url The URL to post the form to.
348	* @param bool $silent Whether to ask the user for credentials if necessary or not.
349	*
350	* @return bool
351	* @author Till Krüss
352	*
353	*/
354	public
355	function initialize_filesystem(
356	$url, $silent = false
357	) {
358	require_once ABSPATH . 'wp-admin/includes/file.php';
359	if ( $silent ) {
360	ob_start();
361	}
362
363	$credentials = request_filesystem_credentials( $url );
364
365	if ( false === $credentials ) {
366	if ( $silent ) {
367	ob_end_clean();
368	}
369
370	return false;
371	}
372
373	if ( ! WP_Filesystem( $credentials ) ) {
374	request_filesystem_credentials( $url );
375
376	if ( $silent ) {
377	ob_end_clean();
378	}
379
380	return false;
381	}
382
383	return true;
384	}
385
386	/**
387	* Calls the drop-in update method if necessary
388	*
389	* @return void
390	* @author Till Krüss
391	*/
392	public
393	function maybe_update_dropin() {
394	if ( defined( 'WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE' ) && WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE ) {
395	return;
396	}
397
398	$has = $this->has_sqlite();
399	if ( ( true === $has ) && $this->object_cache_dropin_needs_updating() ) {
400	add_action( 'shutdown', array( $this, 'update_dropin' ) );
401	}
402	}
403
404	/**
405	* Checks if the `object-cache.php` drop-in is outdated
406	* @return bool
407	* @author Till Krüss
408	*
409	*/
410	public
411	function object_cache_dropin_needs_updating() {
412	if ( ! $this->object_cache_dropin_exists() ) {
413	return true;
414	}
415
416	$dropin = get_plugin_data( $this->dropinfiledest );
417	$plugin = get_plugin_data( $this->dropinfilesource );
418
419	if ( $dropin['PluginURI'] === $plugin['PluginURI'] ) {
420	return version_compare( $dropin['Version'], $plugin['Version'], '<' );
421	}
422
423	return false;
424	}
425
426	/**
427	* Checks if the `object-cache.php` drop-in exists
428	*
429	* @return bool
430	* @author Till Krüss
431	*/
432	public
433	function object_cache_dropin_exists() {
434	return @file_exists( $this->dropinfiledest );
435	}
436
437	/**
438	* Updates the `object-cache.php` drop-in
439	*
440	* @return void
441	* @author Till Krüss
442	*/
443	public
444	function update_dropin() {
445	global $wp_filesystem;
446	$has = $this->has_sqlite();
447	if ( true === $has && $this->initialize_filesystem( '', true ) ) {
448
449	$this->delete_sqlite_files();
450	$result = $wp_filesystem->copy( $this->dropinfilesource, $this->dropinfiledest, true, FS_CHMOD_FILE );
451	/**
452	* Fires on cache enable event
453	*
454	* @param bool $result Whether the filesystem event (copy of the `object-cache.php` file) was successful.
455	*
456	* @since 0.1.0
457	*/
458	do_action( 'sqlite_object_cache_update_dropin', $result );
459	}
460	}
461
462	/**
463	* Validates the `object-cache.php` drop-in
464	*
465	* @return bool
466	* @author Till Krüss
467	*/
468	public function validate_object_cache_dropin() {
469	if ( ! $this->object_cache_dropin_exists() ) {
470	return false;
471	}
472
473	$dropin = get_plugin_data( $this->dropinfiledest );
474	$plugin = get_plugin_data( $this->dropinfilesource );
475
476	/**
477	* Filters the drop-in validation state
478	*
479	* @param bool $state The validation state of the drop-in.
480	* @param string $dropin The `PluginURI` of the drop-in.
481	* @param string $plugin The `PluginURI` of the plugin.
482	*
483	* @since 2.0.16
484	*/
485	return apply_filters(
486	'sqlite_object_cache_validate_dropin',
487	$dropin['PluginURI'] === $plugin['PluginURI'],
488	$dropin['PluginURI'],
489	$plugin['PluginURI']
490	);
491	}
492
493	/**
494	* Plugin deactivation hook
495	*
496	* @param string $plugin Plugin basename.
497	*
498	* @return void
499	* @author Till Krüss
500	*/
501	public
502	function on_deactivation( $plugin ) {
503	wp_cache_flush();
504
505	wp_unschedule_hook( self::CLEAN_EVENT_HOOK );
506	$this->delete_sqlite_files();
507	$this->delete_dropin();
508	}
509
510	private function delete_sqlite_files() {
511	global $wp_filesystem;
512	global $wp_object_cache;
513
514	ob_start();
515
516	if ( method_exists( $wp_object_cache, 'sqlite_files' ) ) {
517	if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
518	foreach ( $wp_object_cache->sqlite_files() as $file ) {
519	$wp_filesystem->delete( $file );
520	}
521	}
522	}
523
524	ob_end_clean();
525	}
526
527	private
528	function delete_dropin() {
529	global $wp_filesystem;
530	ob_start();
531
532	if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
533	$wp_filesystem->delete( $this->dropinfiledest );
534	}
535
536	ob_end_clean();
537	}
538	}
539