thinkrank / includes / seo / class-metadata-pending.php

class-metadata-pending.php in ThinkRank AI SEO – AI SEO Plugin for WordPress: Schema, XML Sitemaps, Meta Tags, Search Console & Local SEO 2.3.0, at includes/seo/class-metadata-pending.php

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1	<?php
2	/**
3	* "Metadata is about to be written" marker.
4	*
5	* The editor SEO panel has no push channel, so historically it polled
6	* `/metadata/{id}` blind for ~45s on every editor open, waiting for a
7	* background writer (Auto AI on publish, imports) that in the overwhelming
8	* majority of sessions was never coming. That cost every user 11+ requests per
9	* open and, on slow hosts, piled up into 503s (#329).
10	*
11	* This flips the panel from "poll and hope" to "poll only when something is
12	* genuinely in flight". A writer marks the post before it queues work and
13	* clears it when done; the metadata endpoint reports the flag; the panel polls
14	* only while it is set.
15	*
16	* Two markers, because the writers come in two shapes:
17	*
18	* - Per post (`mark()`), for a write announced ahead of time for one known
19	* post — Auto AI, which queues a cron run on publish.
20	* - Site wide (`mark_bulk()`), for a job writing across many posts as it goes —
21	* the SEO importer. Marking each post individually would cost one transient
22	* per post for a window of microseconds (the write is synchronous), which
23	* buys nothing; the job announces itself once for as long as it runs.
24	*
25	* A transient rather than post meta deliberately: this is ephemeral run state,
26	* it must not pollute the post's meta, and it must expire on its own if a cron
27	* run dies before clearing it.
28	*
29	* @package ThinkRank\SEO
30	* @since 1.30.0
31	*/
32
33	declare(strict_types=1);
34
35	namespace ThinkRank\SEO;
36
37	if (!defined('ABSPATH')) {
38	exit;
39	}
40
41	/**
42	* Tracks posts with a background metadata write in flight.
43	*/
44	class Metadata_Pending {
45
46	/**
47	* Transient key prefix.
48	*/
49	private const PREFIX = 'thinkrank_meta_pending_';
50
51	/**
52	* Self-expiry, so a cron run that dies before clearing cannot leave a post
53	* polling forever. Comfortably longer than the ~15s Auto AI delay plus the
54	* AI call itself.
55	*/
56	private const TTL = 5 * MINUTE_IN_SECONDS;
57
58	/**
59	* Transient key for a site-wide job (see the class docblock).
60	*/
61	private const BULK_KEY = 'thinkrank_meta_pending_bulk';
62
63	/**
64	* Kept short: every editor open polls while it is set, so a job that dies
65	* between chunks must stop costing requests quickly. Each chunk re-marks,
66	* which is what keeps a running job's window open.
67	*/
68	private const BULK_TTL = 2 * MINUTE_IN_SECONDS;
69
70	/**
71	* Mark a post as having a background metadata write in flight.
72	*
73	* Call this before queueing the work, so the flag is already visible to
74	* an editor that reloads immediately after publish.
75	*
76	* @param int $post_id Post being written to.
77	* @return void
78	*/
79	public static function mark(int $post_id): void {
80	if ($post_id <= 0) {
81	return;
82	}
83	set_transient(self::PREFIX . $post_id, 1, self::TTL);
84	}
85
86	/**
87	* Clear the marker once the write has finished (or definitively failed).
88	*
89	* @param int $post_id Post that was being written to.
90	* @return void
91	*/
92	public static function clear(int $post_id): void {
93	if ($post_id <= 0) {
94	return;
95	}
96	delete_transient(self::PREFIX . $post_id);
97	}
98
99	/**
100	* Mark a site-wide metadata write job as running.
101	*
102	* Re-marking is how a chunked job holds its window open, so call this at
103	* the start of every chunk that writes, not just the first.
104	*
105	* @return void
106	*/
107	public static function mark_bulk(): void {
108	set_transient(self::BULK_KEY, 1, self::BULK_TTL);
109	}
110
111	/**
112	* Clear the site-wide job marker once the job has finished.
113	*
114	* @return void
115	*/
116	public static function clear_bulk(): void {
117	delete_transient(self::BULK_KEY);
118	}
119
120	/**
121	* Whether a background metadata write is in flight for this post.
122	*
123	* True while either this post has its own marker or a site-wide job is
124	* running. Filterable so features that own their own queue (Pro) can
125	* report pending state without going through `mark()`.
126	*
127	* @param int $post_id Post to check.
128	* @return bool
129	*/
130	public static function is_pending(int $post_id): bool {
131	$pending = false !== get_transient(self::PREFIX . $post_id)
132	\|\| false !== get_transient(self::BULK_KEY);
133
134	/**
135	* Filter whether a background metadata write is pending for a post.
136	*
137	* Returning true keeps the editor SEO panel polling for the value;
138	* returning false stops it. Keep any implementation cheap — this runs
139	* on every metadata request.
140	*
141	* @since 1.30.0
142	*
143	* @param bool $pending Whether a write is in flight.
144	* @param int $post_id Post being checked.
145	*/
146	return (bool) apply_filters('thinkrank_metadata_pending', $pending, $post_id);
147	}
148	}
149