← All changes | includes/class-sqlite-object-cache.php +632 -435 1.3.0 → 1.6.2 View file →

		@@ -5,9 +5,9 @@
5	5	* @package WordPress Plugin Template/Includes
6	6	*/
7	7
8	8	if ( ! defined( 'ABSPATH' ) ) {
9		- exit;
	9	+ exit;
10	10	}
11	11
12	12	/**
13	13	* Main plugin class.
		@@ -14,515 +14,712 @@
14	14	*
15	15	* Only make one instance of this, please.
16	16	*/
17	17	class SQLite_Object_Cache {
18		- const CLEAN_EVENT_HOOK = 'sqlite_object_cache_clean';
	18	+ const CLEAN_EVENT_HOOK = 'sqlite_object_cache_clean';
19	19
20		- /**
21		- * Local instance of SQLite_Object_Cache_Admin_API
22		- *
23		- * @var SQLite_Object_Cache_Admin_API|null
24		- */
25		- public $admin;
	20	+ /**
	21	+ * Settings class object
	22	+ *
	23	+ * @var object
	24	+ * @access public
	25	+ * @since 1.0.0
	26	+ */
	27	+ public $settings;
26	28
27		- /**
28		- * Settings class object
29		- *
30		- * @var object
31		- * @access public
32		- * @since 1.0.0
33		- */
34		- public $settings;
	29	+ /**
	30	+ * The version number.
	31	+ *
	32	+ * @var string
	33	+ * @access public
	34	+ * @since 1.0.0
	35	+ */
	36	+ public $_version;
35	37
36		- /**
37		- * The version number.
38		- *
39		- * @var string
40		- * @access public
41		- * @since 1.0.0
42		- */
43		- public $_version;
	38	+ /**
	39	+ * The token.
	40	+ *
	41	+ * @var string
	42	+ * @access public
	43	+ * @since 1.0.0
	44	+ */
	45	+ public $_token;
44	46
45		- /**
46		- * The token.
47		- *
48		- * @var string
49		- * @access public
50		- * @since 1.0.0
51		- */
52		- public $_token;
	47	+ /**
	48	+ * The main plugin file.
	49	+ *
	50	+ * @var string
	51	+ * @access public
	52	+ * @since 1.0.0
	53	+ */
	54	+ public $file;
53	55
54		- /**
55		- * The main plugin file.
56		- *
57		- * @var string
58		- * @access public
59		- * @since 1.0.0
60		- */
61		- public $file;
	56	+ /**
	57	+ * The main plugin directory.
	58	+ *
	59	+ * @var string
	60	+ * @access public
	61	+ * @since 1.0.0
	62	+ */
	63	+ public $dir;
62	64
63		- /**
64		- * The main plugin directory.
65		- *
66		- * @var string
67		- * @access public
68		- * @since 1.0.0
69		- */
70		- public $dir;
	65	+ /**
	66	+ * The plugin assets directory.
	67	+ *
	68	+ * @var string
	69	+ * @access public
	70	+ * @since 1.0.0
	71	+ */
	72	+ public $assets_dir;
71	73
72		- /**
73		- * The plugin assets directory.
74		- *
75		- * @var string
76		- * @access public
77		- * @since 1.0.0
78		- */
79		- public $assets_dir;
	74	+ /**
	75	+ * The plugin assets URL.
	76	+ *
	77	+ * @var string
	78	+ * @access public
	79	+ * @since 1.0.0
	80	+ */
	81	+ public $assets_url;
80	82
81		- /**
82		- * The plugin assets URL.
83		- *
84		- * @var string
85		- * @access public
86		- * @since 1.0.0
87		- */
88		- public $assets_url;
	83	+ /**
	84	+ * Suffix for JavaScripts.
	85	+ *
	86	+ * @var string
	87	+ * @access public
	88	+ * @since 1.0.0
	89	+ */
	90	+ public $script_suffix;
89	91
90		- /**
91		- * Suffix for JavaScripts.
92		- *
93		- * @var string
94		- * @access public
95		- * @since 1.0.0
96		- */
97		- public $script_suffix;
	92	+ /**
	93	+ * Path for the drop-in when it is working.
	94	+ * @var string
	95	+ */
	96	+ public $dropinfiledest;
98	97
99		- /**
100		- * Path for the drop-in when it is working.
101		- * @var string
102		- */
103		- public $dropinfiledest;
	98	+ /**
	99	+ * Path for the drop-in in the plugin tree.
	100	+ * @var string
	101	+ */
	102	+ public $dropinfilesource;
104	103
105		- /**
106		- * Path for the drop-in in the plugin tree.
107		- * @var string
108		- */
109		- public $dropinfilesource;
	104	+ /**
	105	+ * Minimum required sqlite version.
	106	+ *
	107	+ * @var string
	108	+ */
	109	+ public $minimum_sqlite_version = '3.7.0';
110	110
111		- /**
112		- * Minimum required sqlite version.
113		- *
114		- * @var string
115		- */
116		- public $minimum_sqlite_version = '3.7.0';
	111	+ /**
	112	+ * Constructor function.
	113	+ *
	114	+ * @param string $file File constructor.
	115	+ * @param string $version Plugin version.
	116	+ */
	117	+ public function __construct( $file = '', $version = '1.6.2' ) {
	118	+ $this->_version = $version;
	119	+ $this->_token = 'sqlite_object_cache';
117	120
118		- /**
119		- * Constructor funtion.
120		- *
121		- * @param string $file File constructor.
122		- * @param string $version Plugin version.
123		- */
124		- public function __construct( $file = '', $version = '1.3.0' ) {
125		- $this->_version = $version;
126		- $this->_token = 'sqlite_object_cache';
	121	+ // Load plugin environment variables.
	122	+ $this->file = $file;
	123	+ $this->dir =
	124	+ trailingslashit( dirname( trailingslashit( WP_PLUGIN_DIR ) . plugin_basename( $this->file ) ) );
	125	+ $this->assets_dir = trailingslashit( $this->dir . 'assets' );
	126	+ $this->dropinfilesource = $this->assets_dir . 'drop-in/object-cache.php';
	127	+ $this->dropinfiledest = trailingslashit( WP_CONTENT_DIR ) . 'object-cache.php';
127	128
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';
	129	+ $this->assets_url = esc_url( trailingslashit( plugins_url( '/assets/', $this->file ) ) );
135	130
136		- $this->assets_url = esc_url( trailingslashit( plugins_url( '/assets/', $this->file ) ) );
	131	+ register_activation_hook( $this->file, array( $this, 'on_activation' ) );
	132	+ register_deactivation_hook( $this->file, array( $this, 'on_deactivation' ) );
137	133
138		- $this->script_suffix = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';
	134	+ if ( is_admin() ) {
	135	+ /* Suppress backups of .sqlite files if possible. */
	136	+ new SQLite_Backup_Exclusion();
139	137
140		- register_activation_hook( $this->file, array( $this, 'on_activation' ) );
141		- register_deactivation_hook( $this->file, array( $this, 'on_deactivation' ) );
	138	+ /* Health check */
	139	+ new SQLite_Object_Cache_Opcache();
142	140
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		- }
	141	+ add_action( 'admin_notices', function () {
	142	+ $flushed = get_site_transient( 'sqlite-object-cache-flush-on-update' );
	143	+ if ( $flushed ) {
	144	+ delete_site_transient( 'sqlite-object-cache-flush-on-update' );
	145	+ $message = __( 'Flushed the SQLite Object Cache successfully after a software installation or upgrade.', 'sqlite-object-cache' );
	146	+ ?>
	147	+ <div class="notice notice-success sqlite-object-cache is-dismissible">
	148	+ <p><?php echo esc_html( $message ); ?></p>
	149	+ </div>
	150	+ <?php
	151	+ }
	152	+ } );
	153	+ }
149	154
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' ) );
	155	+ add_action( 'admin_init', array( $this, 'maybe_update_dropin' ) );
154	156
155		- /* handle cron cache cleanup */
156		- add_action( self::CLEAN_EVENT_HOOK, array( $this, 'clean' ), 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		- }
	157	+ /* Ensure nothing is cached after software upgrades. */
	158	+ add_action( 'upgrader_process_complete', function () {
	159	+ add_action( 'shutdown', function () {
	160	+ wp_cache_flush();
	161	+ set_site_transient( 'sqlite-object-cache-flush-on-update', true, HOUR_IN_SECONDS );
	162	+ }, 999 );
	163	+ wp_cache_flush();
	164	+ }, 0 );
161	165
162		- /**
163		- * Load plugin textdomain
164		- *
165		- * @access public
166		- * @return void
167		- * @since 1.0.0
168		- */
169		- public function load_plugin_textdomain() {
170		- $domain = 'sqlite-object-cache';
171	166
172		- $locale = apply_filters( 'plugin_locale', get_locale(), $domain );
	167	+ /* Handle cron cache cleanup */
	168	+ add_action( self::CLEAN_EVENT_HOOK, array( $this, 'clean_job' ), 10, 0 );
	169	+ if ( ! wp_next_scheduled( self::CLEAN_EVENT_HOOK ) ) {
	170	+ wp_schedule_event( time() + HOUR_IN_SECONDS, 'hourly', self::CLEAN_EVENT_HOOK );
	171	+ }
	172	+ /* Handle probabilistic non-cron cleanup, one request in 2500. */
	173	+ /* We don't need cryptographic-grade random numbering here. */
	174	+ // phpcs:ignore WordPress.WP.AlternativeFunctions.rand_rand
	175	+ if ( 1 === rand( 1, 2500 ) ) {
	176	+ add_action( 'shutdown', function () {
	177	+ $this->clean_job( 1.25 );
	178	+ }, 999, 0 );
	179	+ }
173	180
174		- load_textdomain( $domain, WP_LANG_DIR . '/' . $domain . '/' . $domain . '-' . $locale . '.mo' );
175		- load_plugin_textdomain( $domain, false, dirname( plugin_basename( $this->file ) ) . '/languages/' );
176		- }
	181	+ /* Admin bar flush button - works on both frontend and backend. */
	182	+ $option = get_option( $this->_token . '_settings', array() );
	183	+ if ( array_key_exists ('adminbarflush', $option ) && 'on' === $option['adminbarflush'] ) {
	184	+ add_action( 'init', array( $this, 'handle_admin_bar_flush' ) );
	185	+ add_action ( 'init', function() {
	186	+ if ( ! ( is_multisite() && ! is_main_site() ) && current_user_can( 'manage_options') ) {
	187	+ add_action( 'admin_bar_menu', array( $this, 'admin_bar_flush_button' ), 100 );
	188	+ add_action( 'admin_notices', array( $this, 'maybe_show_flush_notice' ) );
	189	+ }
	190	+ });
	191	+ }
	192	+ }
177	193
178		- /**
179		- * WP_Cron task to clean cache entries.
180		- *
181		- * @return void
182		- */
183		- public function clean() {
184		- global $wp_object_cache;
185		- $option = get_option( $this->_token . '_settings', array() );
186		- if ( method_exists( $wp_object_cache, 'sqlite_delete_old' ) ) {
187		- $target_size = array_key_exists( 'target_size', $option ) ? $option['target_size'] : 4;
188		- $target_size *= ( 1024 * 1024 );
189		- try {
190		- $wp_object_cache->sqlite_delete_old( $target_size );
191		- } catch ( Exception $ex ) {
192		- error_log( 'sqlite_object_cache cache cleanup failure: ', $ex->getMessage() );
193		- }
194		- }
	194	+ /**
	195	+ * WP_Cron task to clean cache entries.
	196	+ *
	197	+ * @param float $grace_factor Default 1.0
	198	+ *
	199	+ * @return void
	200	+ */
	201	+ public function clean_job( $grace_factor = 1.0 ) {
	202	+ $option = get_option( $this->_token . '_settings', array() );
	203	+ $target_size = empty ( $option['target_size'] ) ? 16 : $option['target_size'];
	204	+ $target_size *= ( 1024 * 1024 );
	205	+ $threshold_size = (int) ( $target_size * $grace_factor );
195	206
196		- if ( method_exists( $wp_object_cache, 'sqlite_remove_expired' ) ) {
197		- try {
198		- $wp_object_cache->sqlite_remove_expired( true );
199		- } catch ( Exception $ex ) {
200		- error_log( 'sqlite_object_cache cache cleanup failure: ', $ex->getMessage() );
201		- }
202		- }
	207	+ global $wp_object_cache;
	208	+ if ( ! method_exists( $wp_object_cache, 'sqlite_get_size' ) ) {
	209	+ return;
	210	+ }
	211	+ /* Clean up old statistics. Do this even when the cache is not over size. */
	212	+ $retention = empty ( $option['retainmeasurements'] ) ? 24 : $option['retainmeasurements'];
	213	+ $wp_object_cache->sqlite_reset_statistics( $retention * HOUR_IN_SECONDS );
203	214
204		- if ( method_exists( $wp_object_cache, 'sqlite_reset_statistics' ) ) {
205		- $retention = array_key_exists( 'retainmeasurements', $option ) ? $option['retainmeasurements'] : 24;
206		- try {
207		- $wp_object_cache->sqlite_reset_statistics( $retention * HOUR_IN_SECONDS );
208		- } catch ( Exception $ex ) {
209		- error_log( 'sqlite_object_cache stats cleanup failure: ', $ex->getMessage() );
210		- }
211		- }
212		- }
	215	+ $current_size = $wp_object_cache->sqlite_get_size();
	216	+ /* Skip this if the current size is small enough. */
	217	+ if ( $current_size <= $threshold_size ) {
	218	+ return;
	219	+ }
213	220
214		- /**
215		- * Plugin activation hook
216		- *
217		- * @return void
218		- */
219		- public
220		- function on_activation() {
221		- /* make sure the autoloaded option is set when activating; avoid an extra dbms or cache hit to fetch it */
222		- $option = get_option( $this->_token . '_settings', 'default' );
223		- if ( 'default' === $option ) {
224		- update_option( $this->_token . '_settings', array(), true );
225		- }
226		- if ( true === $this->has_sqlite() ) {
227		- add_action( 'shutdown', array( $this, 'update_dropin' ) );
228		- }
229		- }
	221	+ /* Remove expired items (transients mostly). */
	222	+ if ( $wp_object_cache->sqlite_remove_expired() ) {
	223	+ /* If anything was removed, get the size again. */
	224	+ $current_size = $wp_object_cache->sqlite_get_size();
	225	+ }
230	226
231		- /**
232		- * Determine whether we can use SQLite3.
233		- *
234		- * @return bool|string true, or an error message.
235		- */
236		- public
237		- function has_sqlite() {
238		- if ( ! class_exists( 'SQLite3' ) || ! extension_loaded( 'sqlite3' ) ) {
239		- return __( 'You cannot use the SQLite Object Cache plugin. Your server does not have php\'s SQLite3 extension installed.', 'sqlite-object-cache' );
240		- }
	227	+ /* Skip this if the size is small enough, after removing expired items. */
	228	+ if ( $current_size <= $threshold_size ) {
	229	+ return;
	230	+ }
241	231
242		- $sqlite_version = $this->sqlite_get_version();
243		- if ( version_compare( $sqlite_version, $this->minimum_sqlite_version ) < 0 ) {
244		- return sprintf(
245		- /* translators: 1 actual SQLite version. 2 required SQLite version) */
246		- __( 'You cannot use the SQLite Object Cache plugin. Your server only offers SQLite3 version %1$s, but at least %2$s is required.', 'sqlite-object-cache' ),
247		- $sqlite_version, $this->minimum_sqlite_version );
248		- }
	232	+ /* Delete the least-recently-updated items to get to the target size. */
	233	+ $wp_object_cache->sqlite_delete_old( $target_size, $current_size );
	234	+ }
249	235
250		- return true;
251		- }
	236	+ /**
	237	+ * Plugin activation hook
	238	+ *
	239	+ * @return void
	240	+ */
	241	+ public function on_activation() {
252	242
253		- /**
254		- * Get the version number for the SQLite extension.
255		- *
256		- * @return string|false SQLite's version number.
257		- */
258		- public
259		- function sqlite_get_version() {
	243	+ $this->sync_apcu_global_to_option( true );
	244	+ if ( true === $this->has_sqlite() ) {
	245	+ add_action( 'shutdown', array( $this, 'update_dropin' ) );
	246	+ add_action( 'shutdown', array( $this, 'delete_all_transients_from_db' ) );
	247	+ }
	248	+ }
260	249
261		- if ( class_exists( 'SQLite3' ) ) {
262		- $version = SQLite3::version();
	250	+ /**
	251	+ * Determine whether we can use SQLite3.
	252	+ *
	253	+ * @return bool|string true, or an error message.
	254	+ */
	255	+ public function has_sqlite() {
	256	+ if ( ! class_exists( 'SQLite3' ) || ! extension_loaded( 'sqlite3' ) ) {
	257	+ return __( 'You cannot use the SQLite Object Cache plugin. Your server does not have php\'s SQLite3 extension installed.', 'sqlite-object-cache' );
	258	+ }
263	259
264		- return $version['versionString'];
265		- }
	260	+ $sqlite_version = $this->sqlite_get_version();
	261	+ if ( version_compare( $sqlite_version, $this->minimum_sqlite_version ) < 0 ) {
	262	+ return sprintf(
	263	+ /* translators: 1 actual SQLite version. 2 required SQLite version) */
	264	+ __( 'You cannot use the SQLite Object Cache plugin. Your server only offers SQLite3 version %1$s, but at least %2$s is required.', 'sqlite-object-cache' ),
	265	+ $sqlite_version, $this->minimum_sqlite_version );
	266	+ }
266	267
267		- return false;
268		- }
	268	+ return true;
	269	+ }
269	270
270		- /**
271		- * Load plugin localization
272		- *
273		- * @access public
274		- * @return void
275		- * @since 1.0.0
276		- */
277		- public
278		- function load_localization() {
279		- load_plugin_textdomain( 'sqlite-object-cache', false, dirname( plugin_basename( $this->file ) ) . '/languages/' );
280		- }
	271	+ /**
	272	+ * Get the version number for the SQLite extension.
	273	+ *
	274	+ * @return string|false SQLite's version number.
	275	+ */
	276	+ public function sqlite_get_version() {
281	277
282		- /**
283		- * Test if we can write in the WP_CONTENT_DIR and modify the `object-cache.php` drop-in
284		- *
285		- * @return true|WP_Error
286		- * @author Till Krüss
287		- *
288		- */
289		- public
290		- function test_filesystem_writing() {
291		- global $wp_filesystem;
	278	+ if ( class_exists( 'SQLite3' ) ) {
	279	+ $version = SQLite3::version();
292	280
293		- if ( ! $this->initialize_filesystem( '', true ) ) {
294		- return new WP_Error( 'fs', __( 'Could not initialize filesystem.', 'sqlite-object-cache' ) );
295		- }
	281	+ return $version['versionString'];
	282	+ }
296	283
297		- $testfiledest = WP_CONTENT_DIR . '/sqlite-write-test.tmp';
	284	+ return false;
	285	+ }
298	286
299		- if ( ! $wp_filesystem->exists( $this->dropinfilesource ) ) {
300		- return new WP_Error( 'exists', __( 'Object cache drop-in file doesn’t exist.', 'sqlite-object-cache' ) );
301		- }
	287	+ /**
	288	+ * Test if we can write in the WP_CONTENT_DIR and modify the `object-cache.php` drop-in
	289	+ *
	290	+ * @return true|WP_Error
	291	+ * @author Till Krüss
	292	+ *
	293	+ */
	294	+ public function test_filesystem_writing() {
	295	+ global $wp_filesystem;
302	296
303		- if ( $wp_filesystem->exists( $testfiledest ) && ! $wp_filesystem->delete( $testfiledest ) ) {
304		- return new WP_Error( 'delete', __( 'Test file exists, but couldn’t be deleted.', 'sqlite-object-cache' ) );
305		- }
	297	+ if ( ! $this->initialize_filesystem( '', true ) ) {
	298	+ return new WP_Error( 'fs', __( 'Could not initialize filesystem.', 'sqlite-object-cache' ) );
	299	+ }
306	300
307		- if ( ! $wp_filesystem->is_writable( WP_CONTENT_DIR ) ) {
308		- return new WP_Error( 'copy', __( 'Content directory is not writable.', 'sqlite-object-cache' ) );
309		- }
	301	+ $testfiledest = WP_CONTENT_DIR . '/sqlite-write-test.tmp';
310	302
311		- if ( ! $wp_filesystem->copy( $this->dropinfilesource, $testfiledest, true, FS_CHMOD_FILE ) ) {
312		- return new WP_Error( 'copy', __( 'Failed to copy test file.', 'sqlite-object-cache' ) );
313		- }
	303	+ if ( ! $wp_filesystem->exists( $this->dropinfilesource ) ) {
	304	+ return new WP_Error( 'exists', __( 'Object cache drop-in file doesn’t exist.', 'sqlite-object-cache' ) );
	305	+ }
314	306
315		- if ( ! $wp_filesystem->exists( $testfiledest ) ) {
316		- return new WP_Error( 'exists', __( 'Copied test file doesn’t exist.', 'sqlite-object-cache' ) );
317		- }
	307	+ if ( $wp_filesystem->exists( $testfiledest ) && ! $wp_filesystem->delete( $testfiledest ) ) {
	308	+ return new WP_Error( 'delete', __( 'Test file exists, but couldn’t be deleted.', 'sqlite-object-cache' ) );
	309	+ }
318	310
319		- $meta = get_file_data( $testfiledest, array( 'Version' => 'Version' ) );
	311	+ if ( ! $wp_filesystem->is_writable( WP_CONTENT_DIR ) ) {
	312	+ return new WP_Error( 'copy', __( 'Content directory is not writable.', 'sqlite-object-cache' ) );
	313	+ }
320	314
321		- if ( $meta['Version'] !== $this->_version ) {
322		- return new WP_Error( 'version', __( 'Couldn’t verify test file contents.', 'sqlite-object-cache' ) );
323		- }
	315	+ if ( ! $wp_filesystem->copy( $this->dropinfilesource, $testfiledest, true, FS_CHMOD_FILE ) ) {
	316	+ return new WP_Error( 'copy', __( 'Failed to copy test file.', 'sqlite-object-cache' ) );
	317	+ }
324	318
325		- if ( ! $wp_filesystem->delete( $testfiledest ) ) {
326		- return new WP_Error( 'delete', __( 'Copied test file couldn’t be deleted.', 'sqlite-object-cache' ) );
327		- }
	319	+ if ( ! $wp_filesystem->exists( $testfiledest ) ) {
	320	+ return new WP_Error( 'exists', __( 'Copied test file doesn’t exist.', 'sqlite-object-cache' ) );
	321	+ }
328	322
329		- return true;
330		- }
	323	+ $meta = get_file_data( $testfiledest, array( 'Version' => 'Version' ) );
331	324
332		- /**
333		- * Initializes the WP filesystem API to be ready for use
334		- *
335		- * @param string $url The URL to post the form to.
336		- * @param bool $silent Whether to ask the user for credentials if necessary or not.
337		- *
338		- * @return bool
339		- * @author Till Krüss
340		- *
341		- */
342		- public
343		- function initialize_filesystem(
344		- $url, $silent = false
345		- ) {
346		- require_once ABSPATH . 'wp-admin/includes/file.php';
347		- if ( $silent ) {
348		- ob_start();
349		- }
	325	+ if ( $meta['Version'] !== $this->_version ) {
	326	+ return new WP_Error( 'version', __( 'Couldn’t verify test file contents.', 'sqlite-object-cache' ) );
	327	+ }
350	328
351		- $credentials = request_filesystem_credentials( $url );
	329	+ if ( ! $wp_filesystem->delete( $testfiledest ) ) {
	330	+ return new WP_Error( 'delete', __( 'Copied test file couldn’t be deleted.', 'sqlite-object-cache' ) );
	331	+ }
352	332
353		- if ( false === $credentials ) {
354		- if ( $silent ) {
355		- ob_end_clean();
356		- }
	333	+ return true;
	334	+ }
357	335
358		- return false;
359		- }
	336	+ /**
	337	+ * Initializes the WP filesystem API to be ready for use
	338	+ *
	339	+ * @param string $url The URL to post the form to.
	340	+ * @param bool $silent Whether to ask the user for credentials if necessary or not.
	341	+ *
	342	+ * @return bool
	343	+ * @author Till Krüss
	344	+ *
	345	+ */
	346	+ public function initialize_filesystem( $url, $silent = false ) {
	347	+ require_once ABSPATH . 'wp-admin/includes/file.php';
	348	+ if ( $silent ) {
	349	+ ob_start();
	350	+ }
360	351
361		- if ( ! WP_Filesystem( $credentials ) ) {
362		- request_filesystem_credentials( $url );
	352	+ $credentials = request_filesystem_credentials( $url );
363	353
364		- if ( $silent ) {
365		- ob_end_clean();
366		- }
	354	+ if ( false === $credentials ) {
	355	+ if ( $silent ) {
	356	+ ob_end_clean();
	357	+ }
367	358
368		- return false;
369		- }
	359	+ return false;
	360	+ }
370	361
371		- return true;
372		- }
	362	+ if ( ! WP_Filesystem( $credentials ) ) {
	363	+ request_filesystem_credentials( $url );
373	364
374		- /**
375		- * Calls the drop-in update method if necessary
376		- *
377		- * @return void
378		- * @author Till Krüss
379		- */
380		- public
381		- function maybe_update_dropin() {
382		- if ( defined( 'WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE' ) && WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE ) {
383		- return;
384		- }
	365	+ if ( $silent ) {
	366	+ ob_end_clean();
	367	+ }
385	368
386		- $has = $this->has_sqlite();
387		- if ( ( true === $has ) && $this->object_cache_dropin_needs_updating() ) {
388		- add_action( 'shutdown', array( $this, 'update_dropin' ) );
389		- }
390		- }
	369	+ return false;
	370	+ }
391	371
392		- /**
393		- * Checks if the `object-cache.php` drop-in is outdated
394		- * @return bool
395		- * @author Till Krüss
396		- *
397		- */
398		- public
399		- function object_cache_dropin_needs_updating() {
400		- if ( ! $this->object_cache_dropin_exists() ) {
401		- return true;
402		- }
	372	+ return true;
	373	+ }
403	374
404		- $dropin = get_plugin_data( $this->dropinfiledest );
405		- $plugin = get_plugin_data( $this->dropinfilesource );
	375	+ /**
	376	+ * Calls the drop-in update method if necessary
	377	+ *
	378	+ * @return void
	379	+ * @author Till Krüss
	380	+ */
	381	+ public function maybe_update_dropin() {
	382	+ if ( defined( 'WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE' ) && WP_SQLITE_OBJECT_CACHE_DISABLE_DROPIN_AUTOUPDATE ) {
	383	+ return;
	384	+ }
406	385
407		- if ( $dropin['PluginURI'] === $plugin['PluginURI'] ) {
408		- return version_compare( $dropin['Version'], $plugin['Version'], '<' );
409		- }
	386	+ $has = $this->has_sqlite();
	387	+ if ( ( true === $has ) && $this->object_cache_dropin_needs_updating() ) {
	388	+ add_action( 'shutdown', array( $this, 'update_dropin' ) );
	389	+ }
	390	+ }
410	391
411		- return false;
412		- }
	392	+ /**
	393	+ * Checks if the `object-cache.php` drop-in is outdated
	394	+ * @return bool
	395	+ * @author Till Krüss
	396	+ *
	397	+ */
	398	+ public function object_cache_dropin_needs_updating() {
	399	+ global $wp_object_cache;
	400	+ if ( ! method_exists( $wp_object_cache, 'dropin_get_version' ) ) {
	401	+ return true;
	402	+ }
	403	+ return version_compare( $wp_object_cache->dropin_get_version(), $this->_version, '<' );
	404	+ }
413	405
414		- /**
415		- * Checks if the `object-cache.php` drop-in exists
416		- *
417		- * @return bool
418		- * @author Till Krüss
419		- */
420		- public
421		- function object_cache_dropin_exists() {
422		- return @file_exists( $this->dropinfiledest );
423		- }
	406	+ /**
	407	+ * Updates the `object-cache.php` drop-in
	408	+ *
	409	+ * @return void
	410	+ * @author Till Krüss
	411	+ */
	412	+ public function update_dropin() {
	413	+ global $wp_filesystem;
	414	+ $has = $this->has_sqlite();
	415	+ if ( true === $has && $this->initialize_filesystem( '', true ) ) {
424	416
425		- /**
426		- * Updates the `object-cache.php` drop-in
427		- *
428		- * @return void
429		- * @author Till Krüss
430		- */
431		- public
432		- function update_dropin() {
433		- global $wp_filesystem;
434		- $has = $this->has_sqlite();
435		- if ( true === $has && $this->initialize_filesystem( '', true ) ) {
	417	+ $this->delete_sqlite_files();
	418	+ $result = $wp_filesystem->copy( $this->dropinfilesource, $this->dropinfiledest, true, FS_CHMOD_FILE );
	419	+ /**
	420	+ * Fires on cache enable event
	421	+ *
	422	+ * @param bool $result Whether the filesystem event (copy of the `object-cache.php` file) was successful.
	423	+ *
	424	+ * @since 0.1.0
	425	+ */
	426	+ do_action( 'sqlite_object_cache_update_dropin', $result );
	427	+ }
	428	+ }
436	429
437		- $this->delete_sqlite_files();
438		- $result = $wp_filesystem->copy( $this->dropinfilesource, $this->dropinfiledest, true, FS_CHMOD_FILE );
439		- /**
440		- * Fires on cache enable event
441		- *
442		- * @param bool $result Whether the filesystem event (copy of the `object-cache.php` file) was successful.
443		- *
444		- * @since 0.1.0
445		- */
446		- do_action( 'sqlite_object_cache_update_dropin', $result );
447		- }
448		- }
	430	+ /**
	431	+ * Validates the `object-cache.php` drop-in
	432	+ *
	433	+ * @return bool
	434	+ * @author Till Krüss
	435	+ */
	436	+ public function validate_object_cache_dropin() {
	437	+ global $wp_object_cache;
449	438
450		- /**
451		- * Validates the `object-cache.php` drop-in
452		- *
453		- * @return bool
454		- * @author Till Krüss
455		- */
456		- public function validate_object_cache_dropin() {
457		- if ( ! $this->object_cache_dropin_exists() ) {
458		- return false;
459		- }
	439	+ if ( ! method_exists( $wp_object_cache, 'dropin_get_version' ) ) {
	440	+ return false;
	441	+ }
460	442
461		- $dropin = get_plugin_data( $this->dropinfiledest );
462		- $plugin = get_plugin_data( $this->dropinfilesource );
	443	+ $dropin = get_plugin_data( $this->dropinfiledest );
	444	+ $plugin = get_plugin_data( $this->dropinfilesource );
463	445
464		- /**
465		- * Filters the drop-in validation state
466		- *
467		- * @param bool $state The validation state of the drop-in.
468		- * @param string $dropin The `PluginURI` of the drop-in.
469		- * @param string $plugin The `PluginURI` of the plugin.
470		- *
471		- * @since 2.0.16
472		- */
473		- return apply_filters(
474		- 'sqlite_object_cache_validate_dropin',
475		- $dropin['PluginURI'] === $plugin['PluginURI'],
476		- $dropin['PluginURI'],
477		- $plugin['PluginURI']
478		- );
479		- }
	446	+ /**
	447	+ * Filters the drop-in validation state
	448	+ *
	449	+ * @param bool $state The validation state of the drop-in.
	450	+ * @param string $dropin The `PluginURI` of the drop-in.
	451	+ * @param string $plugin The `PluginURI` of the plugin.
	452	+ *
	453	+ * @since 2.0.16
	454	+ */
	455	+ return apply_filters(
	456	+ 'sqlite_object_cache_validate_dropin',
	457	+ $dropin['PluginURI'] === $plugin['PluginURI'],
	458	+ $dropin['PluginURI'],
	459	+ $plugin['PluginURI']
	460	+ );
	461	+ }
480	462
481		- /**
482		- * Plugin deactivation hook
483		- *
484		- * @param string $plugin Plugin basename.
485		- *
486		- * @return void
487		- * @author Till Krüss
488		- */
489		- public
490		- function on_deactivation(
491		- $plugin
492		- ) {
493		- wp_cache_flush();
	463	+ /**
	464	+ * Plugin deactivation hook
	465	+ *
	466	+ * @param string $plugin Plugin basename.
	467	+ *
	468	+ * @return void
	469	+ * @author Till Krüss
	470	+ */
	471	+ public function on_deactivation( $plugin ) {
494	472
495		- wp_unschedule_hook( self::CLEAN_EVENT_HOOK );
496		- $this->delete_sqlite_files();
497		- $this->delete_dropin();
498		- }
	473	+ wp_cache_flush();
499	474
500		- private function delete_sqlite_files() {
501		- global $wp_filesystem;
502		- global $wp_object_cache;
	475	+ wp_unschedule_hook( self::CLEAN_EVENT_HOOK );
	476	+ $this->delete_sqlite_files();
	477	+ $this->delete_dropin();
	478	+ $this->delete_all_transients_from_db();
	479	+ }
503	480
504		- ob_start();
	481	+ private function delete_sqlite_files() {
	482	+ global $wp_filesystem;
	483	+ global $wp_object_cache;
505	484
506		- if ( method_exists( $wp_object_cache, 'sqlite_files' ) ) {
507		- if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
508		- foreach ( $wp_object_cache->sqlite_files() as $file ) {
509		- $wp_filesystem->delete( $file );
510		- }
511		- }
512		- }
	485	+ if ( method_exists( $wp_object_cache, 'sqlite_files' ) ) {
	486	+ if ( $this->initialize_filesystem( '', true ) ) {
	487	+ foreach ( $wp_object_cache->sqlite_files() as $file ) {
	488	+ $wp_filesystem->delete( $file );
	489	+ }
	490	+ }
	491	+ }
	492	+ }
513	493
514		- ob_end_clean();
515		- }
	494	+ private function delete_dropin() {
	495	+ global $wp_filesystem;
	496	+ ob_start();
516	497
517		- private
518		- function delete_dropin() {
519		- global $wp_filesystem;
520		- ob_start();
	498	+ if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
	499	+ $wp_filesystem->delete( $this->dropinfiledest );
	500	+ }
521	501
522		- if ( $this->validate_object_cache_dropin() && $this->initialize_filesystem( '', true ) ) {
523		- $wp_filesystem->delete( $this->dropinfiledest );
524		- }
	502	+ ob_end_clean();
	503	+ }
525	504
526		- ob_end_clean();
527		- }
	505	+ /**
	506	+ * Deletes all transients from the database.
	507	+ *
	508	+ * It is necessary to do this when deactivating a persistent object cache
	509	+ * because the transients are kept there, and the ones in the database are
	510	+ * possibly stale.
	511	+ *
	512	+ * This hammers performance. But deactivating a persistent object cache is
	513	+ * not a common operation.
	514	+ *
	515	+ * @global wpdb $wpdb WordPress database abstraction object.
	516	+ */
	517	+ public function delete_all_transients_from_db() {
	518	+ global $wpdb;
	519	+ if ( ! is_multisite() ) {
	520	+ $this->clear_blog_transients();
	521	+ // Single site stores site transients in the options table.
	522	+ $this->clear_blog_transients( '_site_transient_' );
	523	+ } else {
	524	+ foreach ( get_sites( array( 'number' => 0, 'fields' => 'ids', 'no_found_rows' => true, 'orderby' => false ) ) as $site_id ) {
	525	+ try {
	526	+ switch_to_blog( $site_id );
	527	+ $this->clear_blog_transients();
	528	+ } catch ( Exception $ex ) {
	529	+ /* Empty, intentionally. Don't crash clearing transients. */
	530	+ } finally {
	531	+ restore_current_blog();
	532	+ }
	533	+ }
	534	+ // Multisite stores site transients in the sitemeta table.
	535	+ // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching
	536	+ $wpdb->query(
	537	+ $wpdb->prepare(
	538	+ "DELETE FROM {$wpdb->sitemeta} WHERE a.meta_key LIKE %s",
	539	+ $wpdb->esc_like( '_site_transient_' ) . '%'
	540	+ )
	541	+ );
	542	+
	543	+ }
	544	+ }
	545	+
	546	+ /**
	547	+ * DELETE transients from the current blog's options table.
	548	+ *
	549	+ * @param string $tag _site_transient_ or _transient_, the default.
	550	+ *
	551	+ * @return void
	552	+ */
	553	+ private function clear_blog_transients( $tag = '_transient_') {
	554	+ global $wpdb;
	555	+ // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching
	556	+ $wpdb->query(
	557	+ $wpdb->prepare(
	558	+ "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s",
	559	+ $wpdb->esc_like( $tag ) . '%'
	560	+ )
	561	+ );
	562	+ }
	563	+
	564	+ /**
	565	+ * @return bool True if APCu support is activated for this plugin.
	566	+ */
	567	+ public function apcu_is_activated() {
	568	+ return defined( 'WP_SQLITE_OBJECT_CACHE_APCU' ) && WP_SQLITE_OBJECT_CACHE_APCU
	569	+ && $this->apcu_extension_is_enabled();
	570	+ }
	571	+
	572	+ /**
	573	+ * @return bool True if the APCu extension is loaded and enabled.
	574	+ */
	575	+ public function apcu_extension_is_enabled() {
	576	+ return function_exists( 'apcu_enabled' ) && apcu_enabled();
	577	+ }
	578	+
	579	+ /**
	580	+ * Make sure WP_SQLITE_OBJECT_CACHE_APCU and $option['use_apcu'] match.
	581	+ *
	582	+ * @param bool $unconditional true if we should always change the option to match WP_SQLITE_OBJECT_CACHE_APCU.
	583	+ *
	584	+ * @return string 'on' or 'off': the current activation state of epcu.
	585	+ */
	586	+ public function sync_apcu_global_to_option( $unconditional = true ) {
	587	+ global $wp_object_cache;
	588	+ $option = get_option( $this->_token . '_settings', array() );
	589	+ $option_dirty = false;
	590	+ $updated_flag = array_key_exists( 'use_apcu_updated', $option );
	591	+ $use_apcu = array_key_exists( 'use_apcu', $option ) && 'on' === $option['use_apcu'] ? 'on' : 'off';
	592	+ if ( $updated_flag ) {
	593	+ unset ( $option['use_apcu_updated'] );
	594	+ $option_dirty = true;
	595	+ }
	596	+ $target_use_apcu = $this->apcu_is_activated() ? 'on' : 'off';
	597	+ if ( ! $unconditional && $updated_flag ) {
	598	+ $target_use_apcu = $use_apcu;
	599	+ }
	600	+ if ( $target_use_apcu !== $use_apcu ) {
	601	+ $option['use_apcu'] = $target_use_apcu;
	602	+ $option_dirty = true;
	603	+ }
	604	+ if ( $option_dirty ) {
	605	+ if ( method_exists( $wp_object_cache, 'apcu-clear_cache' ) ) {
	606	+ $wp_object_cache->apcu_clear_cache();
	607	+ }
	608	+ update_option( $this->_token . '_settings', $option, true );
	609	+ }
	610	+
	611	+ return $target_use_apcu;
	612	+ }
	613	+
	614	+ /**
	615	+ * Add a flush button to the admin bar.
	616	+ *
	617	+ * @param WP_Admin_Bar $wp_admin_bar The admin bar instance.
	618	+ *
	619	+ * @return void
	620	+ */
	621	+ public function admin_bar_flush_button( $wp_admin_bar ) {
	622	+ if ( ! is_admin_bar_showing() ) {
	623	+ return;
	624	+ }
	625	+
	626	+ if ( ! current_user_can( 'manage_options' ) ) {
	627	+ return;
	628	+ }
	629	+
	630	+ // Only show on main site for multisite installations.
	631	+ if ( is_multisite() && ! is_main_site() ) {
	632	+ return;
	633	+ }
	634	+
	635	+ $flush_url = add_query_arg(
	636	+ array( 'sqlite_object_cache_action' => 'flush' ),
	637	+ remove_query_arg( 'sqlite_object_cache_action' )
	638	+ );
	639	+ $nonced_url = wp_nonce_url( $flush_url, 'sqlite_object_cache_flush' );
	640	+
	641	+ $wp_admin_bar->add_node(
	642	+ array(
	643	+ 'id' => 'sqlite-object-cache-flush',
	644	+ 'title' => __( 'Flush Object Cache', 'sqlite-object-cache' ),
	645	+ 'href' => $nonced_url,
	646	+ 'meta' => array(
	647	+ 'title' => __( 'Delete all object cache entries now, including all transients.', 'sqlite-object-cache' ),
	648	+ ),
	649	+ )
	650	+ );
	651	+ }
	652	+
	653	+ /**
	654	+ * Handle the admin bar flush action.
	655	+ *
	656	+ * @return void
	657	+ */
	658	+ public function handle_admin_bar_flush() {
	659	+ if ( ! isset( $_GET['sqlite_object_cache_action'] ) ) {
	660	+ return;
	661	+ }
	662	+
	663	+ $action = sanitize_key( wp_unslash( $_GET['sqlite_object_cache_action'] ) );
	664	+
	665	+ if ( 'flush' !== $action ) {
	666	+ return;
	667	+ }
	668	+
	669	+ if ( ! current_user_can( 'manage_options' ) ) {
	670	+ wp_die( esc_html__( 'You do not have permission to flush the object cache.', 'sqlite-object-cache' ) );
	671	+ }
	672	+
	673	+ // Only allow flush on main site for multisite installations (matches button visibility).
	674	+ if ( is_multisite() && ! is_main_site() ) {
	675	+ wp_die( esc_html__( 'Cache flush is only available on the main site.', 'sqlite-object-cache' ) );
	676	+ }
	677	+
	678	+ check_admin_referer( 'sqlite_object_cache_flush' );
	679	+
	680	+ wp_cache_flush();
	681	+
	682	+ // Use a user-specific transient so only the initiating user sees the flush notice (applies to both single-site and multisite).
	683	+ $transient_key = 'sqlite_object_cache_flushed_' . get_current_user_id();
	684	+ set_transient( $transient_key, true, 30 );
	685	+
	686	+ $referer = wp_get_referer();
	687	+ if ( $referer ) {
	688	+ $redirect_url = $referer;
	689	+ } else {
	690	+ $redirect_url = is_admin() ? admin_url() : home_url();
	691	+ }
	692	+ // Remove action and nonce query parameters from URL.
	693	+ $redirect_url = remove_query_arg( array( 'sqlite_object_cache_action', '_wpnonce' ), $redirect_url );
	694	+
	695	+ wp_safe_redirect( $redirect_url );
	696	+ exit;
	697	+ }
	698	+
	699	+ /**
	700	+ * Check for flush transient and show notice if set.
	701	+ *
	702	+ * @return void
	703	+ */
	704	+ public function maybe_show_flush_notice() {
	705	+ $transient_key = 'sqlite_object_cache_flushed_' . get_current_user_id();
	706	+ if ( get_transient( $transient_key ) ) {
	707	+ delete_transient( $transient_key );
	708	+ $this->show_flush_notice();
	709	+ }
	710	+ }
	711	+
	712	+ /**
	713	+ * Display a notice when the object cache was flushed via admin bar.
	714	+ *
	715	+ * @return void
	716	+ */
	717	+ public function show_flush_notice() {
	718	+ ?>
	719	+ <div class="notice notice-success sqlite-object-cache is-dismissible">
	720	+ <p><?php esc_html_e( 'SQLite Object Cache flushed successfully.', 'sqlite-object-cache' ); ?></p>
	721	+ </div>
	722	+ <?php
	723	+ }
	724	+
528	725	}