flywp / includes / Fastcgi_Cache.php

Fastcgi_Cache.php in FlyWP Helper – Page Cache, Page Optimization, Emails for FlyWP Server Control Panel 1.7.1, at includes/Fastcgi_Cache.php

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1	<?php
2
3	namespace FlyWP;
4
5	use WP_Error;
6
7	class Fastcgi_Cache {
8
9	/**
10	* Cache path.
11	*
12	* @var string
13	*/
14	const CACHE_PATH = '/var/run/nginx-cache';
15
16	/**
17	* Cache option settings key.
18	*
19	* @var string
20	*/
21	const SETTINGS_KEY = 'flywp_fastcgi_cache';
22
23	public function __construct() {
24	add_action( 'save_post', [ $this, 'on_save_post' ], 10, 2 );
25	add_action( 'delete_post', [ $this, 'wp_trash_post' ], 10, 2 );
26	// add_action( 'edited_term', [ $this, 'purge_taxonomy_cache' ], 10, 2 );
27	// add_action( 'wp_update_nav_menu', [ $this, 'purge_home_cache' ], 10, 2 );
28	}
29
30	/**
31	* FastCGI cache purge url.
32	*
33	* @return string
34	*/
35	public function purge_cache_url() {
36	return wp_nonce_url(
37	add_query_arg(
38	[ 'flywp-action' => 'purge-fastcgi-cache' ],
39	admin_url( 'index.php?page=flywp' )
40	),
41	'fly-fastcgi-purge-cache'
42	);
43	}
44
45	/**
46	* Check if the cache is enabled.
47	*
48	* @return bool
49	*/
50	public function enabled() {
51	return $this->settings() && $this->settings()['enabled'];
52	}
53
54	/**
55	* Get all cache settings.
56	*
57	* @return array
58	*/
59	public function settings() {
60	$default = [
61	'enabled' => true,
62	'home_created' => true,
63	'home_deleted' => true,
64	// 'single_modified' => true,
65	// 'single_comment' => true,
66	];
67
68	return get_option( self::SETTINGS_KEY, $default );
69	}
70
71	/**
72	* Get a cache setting.
73	*
74	* @param string $key Setting key
75	*
76	* @return mixed
77	*/
78	public function get_setting( $key ) {
79	return isset( $this->settings()[ $key ] ) ? $this->settings()[ $key ] : false;
80	}
81
82	/**
83	* Purge all cache.
84	*
85	* @return void
86	*/
87	public function clear_cache() {
88	global $wp_filesystem;
89
90	if ( ! is_object( $wp_filesystem ) ) {
91	require_once ABSPATH . '/wp-admin/includes/file.php';
92	WP_Filesystem();
93	}
94
95	if ( ! $wp_filesystem->exists( self::CACHE_PATH ) ) {
96	return new WP_Error( 'cache_not_exists', __( 'Cache directory does not exist.', 'flywp' ) );
97	}
98
99	if ( ! $wp_filesystem->is_dir( self::CACHE_PATH ) ) {
100	return new WP_Error( 'cache_not_dir', __( 'Cache directory is not a directory.', 'flywp' ) );
101	}
102
103	if ( ! $wp_filesystem->is_writable( self::CACHE_PATH ) ) {
104	return new WP_Error( 'cache_not_writable', __( 'Cache directory is not writable.', 'flywp' ) );
105	}
106
107	$wp_filesystem->rmdir( self::CACHE_PATH, true );
108	$wp_filesystem->mkdir( self::CACHE_PATH );
109
110	return true;
111	}
112
113	/**
114	* Purge cache by URL.
115	*
116	* @param string $url URL to purge
117	*
118	* @return void
119	*/
120	public function purge_cache_by_url( $url ) {
121	$parsed = wp_parse_url( $url );
122	$path = isset( $parsed['path'] ) ? $parsed['path'] : '';
123
124	// Ensure path ends with trailing slash
125	if ( substr( $path, -1 ) !== '/' ) {
126	$path .= '/';
127	}
128
129	// cache key format (without space): $protocal $method $host $path
130	// because of nginx-proxy, all request will be http, so we don't need to check protocal
131	// $method is always GET as we only cache GET request
132	$hash = md5( 'httpGET' . $parsed['host'] . $path );
133
134	$cache_path = self::CACHE_PATH . '/' . substr( $hash, -1 ) . '/' . substr( $hash, -3, 2 ) . '/' . $hash;
135
136	if ( file_exists( $cache_path ) ) {
137	unlink( $cache_path );
138	}
139	}
140
141	/**
142	* Purge homepage cache.
143	*
144	* @return void
145	*/
146	public function purge_home_cache() {
147	$this->purge_cache_by_url( home_url() );
148	}
149
150	/**
151	* Purge cache when a post is saved.
152	*
153	* @param int $post_id Post ID
154	* @param object $post Post object
155	*
156	* @return void
157	*/
158	public function on_save_post( $post_id, $post ) {
159	if ( $post->post_status !== 'publish' ) {
160	return;
161	}
162
163	if ( $this->get_setting( 'home_created' ) ) {
164	$this->purge_home_cache();
165	}
166
167	$this->purge_cache_by_url( get_permalink( $post ) );
168	}
169
170	/**
171	* Purge cache when a post is trashed.
172	*
173	* @param int $post_id Post ID
174	*
175	* @return void
176	*/
177	public function wp_trash_post( $post_id ) {
178	$post = get_post( $post_id );
179
180	if ( $this->get_setting( 'single_modified' ) ) {
181	$this->purge_cache_by_url( get_permalink( $post ) );
182	}
183
184	if ( $this->get_setting( 'home_created' ) && $post->post_status === 'publish' ) {
185	$this->purge_home_cache();
186	}
187	}
188
189	public function purge_taxonomy_cache( $term_id, $taxonomy ) {
190	// :TODO
191	}
192
193	public function purge_archive_cache() {
194	// :TODO
195	}
196	}
197