solid-performance / src / Performance / Preload / Monitor / Monitor.php

Monitor.php in Solid Performance – Your No-Code Caching, Performance, & Page Speed Solution 1.4.0, at src/Performance/Preload/Monitor/Monitor.php

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1	<?php
2	/**
3	* The preload monitor to check for a stalled preloader.
4	*
5	* @package SolidWP\Performance
6	*/
7
8	declare( strict_types=1 );
9
10	namespace SolidWP\Performance\Preload\Monitor;
11
12	use SolidWP\Performance\Preload\Monitor\Exceptions\PreloadMonitorMaxRetriesException;
13
14	/**
15	* The preload monitor to check for a stalled preloader.
16	*
17	* @package SolidWP\Performance
18	*/
19	class Monitor {
20
21	/**
22	* @var Repository
23	*/
24	private Repository $repository;
25
26	/**
27	* How long in seconds the count can remain stale for.
28	*
29	* @var int
30	*/
31	private int $timeout;
32
33	/**
34	* The maximum number of times we retry a stalled preloader before giving up.
35	*
36	* @var int
37	*/
38	private int $max_retries;
39
40	/**
41	* @param Repository $repository The monitor repository.
42	* @param int $timeout How long in seconds the count can remain stale for.
43	* @param int $max_retries The maximum number of times we retry a stalled preloader before giving up.
44	*/
45	public function __construct( Repository $repository, int $timeout = 12, int $max_retries = 10 ) {
46	$this->repository = $repository;
47	$this->timeout = $timeout;
48	$this->max_retries = $max_retries;
49	}
50
51	/**
52	* Check if the preloader is stalled out.
53	*
54	* @param int $url_count The number of URLs remaining.
55	*
56	* @throws PreloadMonitorMaxRetriesException If we exhausted all of our retries.
57	*
58	* @return bool
59	*/
60	public function is_stalled( int $url_count ): bool {
61	$status = $this->repository->get();
62	$count = $status['count'] ?? 0;
63	$last_activity = $status['last_activity'] ?? 0;
64	$retries = $status['retries'] ?? 0;
65
66	// This is the first run.
67	if ( ! $count && ! $last_activity ) {
68	$this->repository->set( $url_count );
69
70	return false;
71	}
72
73	// Only check every x seconds...
74	if ( time() - $last_activity < $this->timeout ) {
75	return false;
76	}
77
78	// URL count has not changed, we're stalled.
79	$is_stalled = $count === $url_count;
80
81	// Check if we've reached the max retries.
82	if ( $is_stalled ) {
83	++$retries;
84
85	if ( $retries >= $this->max_retries ) {
86	throw new PreloadMonitorMaxRetriesException(
87	sprintf(
88	'The Preload Monitor tried to restart the preloader %d times and gave up.',
89	$this->max_retries
90	)
91	);
92	}
93	}
94
95	$this->repository->set( $url_count, $retries );
96
97	return $is_stalled;
98	}
99
100	/**
101	* Clean up any monitor data.
102	*
103	* @return bool
104	*/
105	public function clean(): bool {
106	return $this->repository->delete();
107	}
108	}
109