flywp / includes / Fastcgi_Cache.php

Fastcgi_Cache.php in FlyWP Helper – Page Cache, Page Optimization, Emails for FlyWP Server Control Panel 0.3, 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	* Check if the cache is enabled.
32	*
33	* @return bool
34	*/
35	public function enabled() {
36	return $this->settings() && $this->settings()['enabled'];
37	}
38
39	/**
40	* Get all cache settings.
41	*
42	* @return array
43	*/
44	public function settings() {
45	$default = [
46	'enabled' => true,
47	'home_created' => true,
48	'home_deleted' => true,
49	// 'single_modified' => true,
50	// 'single_comment' => true,
51	];
52
53	return get_option( self::SETTINGS_KEY, $default );
54	}
55
56	/**
57	* Get a cache setting.
58	*
59	* @param string $key Setting key
60	*
61	* @return mixed
62	*/
63	public function get_setting( $key ) {
64	return isset( $this->settings()[ $key ] ) ? $this->settings()[ $key ] : false;
65	}
66
67	/**
68	* Purge all cache.
69	*
70	* @return void
71	*/
72	public function clear_cache() {
73	global $wp_filesystem;
74
75	if ( ! is_object( $wp_filesystem ) ) {
76	require_once ABSPATH . '/wp-admin/includes/file.php';
77	WP_Filesystem();
78	}
79
80	if ( ! $wp_filesystem->exists( self::CACHE_PATH ) ) {
81	return new WP_Error( 'cache_not_exists', __( 'Cache directory does not exist.', 'flywp' ) );
82	}
83
84	if ( ! $wp_filesystem->is_dir( self::CACHE_PATH ) ) {
85	return new WP_Error( 'cache_not_dir', __( 'Cache directory is not a directory.', 'flywp' ) );
86	}
87
88	if ( ! $wp_filesystem->is_writable( self::CACHE_PATH ) ) {
89	return new WP_Error( 'cache_not_writable', __( 'Cache directory is not writable.', 'flywp' ) );
90	}
91
92	$wp_filesystem->rmdir( self::CACHE_PATH, true );
93	$wp_filesystem->mkdir( self::CACHE_PATH );
94
95	return true;
96	}
97
98	/**
99	* Purge cache by URL.
100	*
101	* @param string $url URL to purge
102	*
103	* @return void
104	*/
105	public function purge_cache_by_url( $url ) {
106	$parsed = wp_parse_url( $url );
107	$path = isset( $parsed['path'] ) ? $parsed['path'] : '';
108
109	// cache key format (without space): $protocal $method $host $path
110	// because of nginx-proxy, all request will be http, so we don't need to check protocal
111	// $method is always GET as we only cache GET request
112	$hash = md5( 'httpGET' . $parsed['host'] . $path );
113
114	$cache_path = self::CACHE_PATH . '/' . substr( $hash, -1 ) . '/' . substr( $hash, -3, 2 ) . '/' . $hash;
115
116	if ( file_exists( $cache_path ) ) {
117	unlink( $cache_path );
118	}
119	}
120
121	/**
122	* Purge homepage cache.
123	*
124	* @return void
125	*/
126	public function purge_home_cache() {
127	$this->purge_cache_by_url( home_url() );
128	}
129
130	/**
131	* Purge cache when a post is saved.
132	*
133	* @param int $post_id Post ID
134	* @param object $post Post object
135	*
136	* @return void
137	*/
138	public function on_save_post( $post_id, $post ) {
139	if ( $post->post_status !== 'publish' ) {
140	return;
141	}
142
143	if ( $this->get_setting( 'home_created' ) ) {
144	$this->purge_home_cache();
145	}
146
147	$this->purge_cache_by_url( get_permalink( $post ) );
148	}
149
150	/**
151	* Purge cache when a post is trashed.
152	*
153	* @param int $post_id Post ID
154	*
155	* @return void
156	*/
157	public function wp_trash_post( $post_id ) {
158	$post = get_post( $post_id );
159
160	if ( $this->get_setting( 'single_modified' ) ) {
161	$this->purge_cache_by_url( get_permalink( $post ) );
162	}
163
164	if ( $this->get_setting( 'home_created' ) && $post->post_status === 'publish' ) {
165	$this->purge_home_cache();
166	}
167	}
168
169	public function purge_taxonomy_cache( $term_id, $taxonomy ) {
170	// :TODO
171	}
172
173	public function purge_archive_cache() {
174	// :TODO
175	}
176	}
177