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| 1 | <?php |
| 2 | /** |
| 3 | * Speed score history after Jetpack Boost |
| 4 | * |
| 5 | * @package automattic/jetpack-boost-speed-score |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Boost_Speed_Score; |
| 9 | |
| 10 | use Automattic\Jetpack\Boost_Core\Lib\Transient; |
| 11 | |
| 12 | /** |
| 13 | * Class Speed_Score_History |
| 14 | * |
| 15 | * @package Automattic\Jetpack\Boost_Speed_Score\Lib |
| 16 | */ |
| 17 | class Speed_Score_History { |
| 18 | const OPTION_PREFIX = 'jetpack_boost_speed_score_history_'; |
| 19 | const STALE_TRANSIENT_KEY = 'speed_score_stale_marker'; |
| 20 | |
| 21 | /** |
| 22 | * Limit the number of recent records to keep. |
| 23 | */ |
| 24 | const LIMIT = 20; |
| 25 | |
| 26 | /** |
| 27 | * The list of history entries. |
| 28 | * |
| 29 | * @var array |
| 30 | */ |
| 31 | private $entries; |
| 32 | |
| 33 | /** |
| 34 | * URL of the site the speed score belongs to. |
| 35 | * |
| 36 | * @var string |
| 37 | */ |
| 38 | private $url; |
| 39 | |
| 40 | /** |
| 41 | * Speed_Score_History constructor. |
| 42 | * |
| 43 | * @param string $url URL of the site the speed scores belong to. |
| 44 | */ |
| 45 | public function __construct( $url ) { |
| 46 | $this->url = $url; |
| 47 | $this->entries = get_option( $this->get_option_name(), array() ); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Determine the option_name used to store the speed score data in options table. |
| 52 | * |
| 53 | * @return string |
| 54 | */ |
| 55 | private function get_option_name() { |
| 56 | return static::OPTION_PREFIX . Speed_Score_Request::generate_cache_id_from_url( $this->url ); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Get the number of history records currently stored. |
| 61 | * |
| 62 | * @return int |
| 63 | */ |
| 64 | public function count() { |
| 65 | return count( $this->entries ); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Find the latest available speed score history record. |
| 70 | * |
| 71 | * @param int $offset Instead of receiving the last one, you can use offset to receive a slightly older speed score. |
| 72 | * |
| 73 | * @return array|null |
| 74 | */ |
| 75 | public function latest( $offset = 0 ) { |
| 76 | $index = $this->count() - ( $offset + 1 ); |
| 77 | |
| 78 | if ( $index >= 0 ) { |
| 79 | return $this->entries[ $index ]; |
| 80 | } |
| 81 | |
| 82 | return null; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Find the latest available speed scores. |
| 87 | * |
| 88 | * @param int $offset Instead of receiving the last one, you can use offset to receive a slightly older speed score. |
| 89 | * |
| 90 | * @return array|null |
| 91 | */ |
| 92 | public function latest_scores( $offset = 0 ) { |
| 93 | $index = $this->count() - ( $offset + 1 ); |
| 94 | |
| 95 | if ( $index >= 0 ) { |
| 96 | return $this->entries[ $index ]['scores']; |
| 97 | } |
| 98 | |
| 99 | return null; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Get a timestamp that marks previous history stale. |
| 104 | * |
| 105 | * All speed score before this timestamp are considered stale. |
| 106 | * |
| 107 | * @return array |
| 108 | */ |
| 109 | public static function get_stale_timestamp() { |
| 110 | $last_stale_marker = Transient::get( static::STALE_TRANSIENT_KEY, 0 ); |
| 111 | |
| 112 | // Any score that is older than 24 hours or before the last stale marker is considered stale. |
| 113 | return max( $last_stale_marker, time() - DAY_IN_SECONDS ); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * Mark previous speed score as stale. |
| 118 | * |
| 119 | * If a there were significant changes to the site, we want to mark prior speed scores as stale. |
| 120 | */ |
| 121 | public static function mark_stale() { |
| 122 | Transient::set( static::STALE_TRANSIENT_KEY, time() ); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Check if the last item in history is stale. |
| 127 | */ |
| 128 | public function is_stale() { |
| 129 | $last_entry = $this->latest(); |
| 130 | |
| 131 | if ( ! $last_entry ) { |
| 132 | return true; |
| 133 | } |
| 134 | |
| 135 | return $last_entry['timestamp'] < self::get_stale_timestamp(); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Record a new history entry for speed scores. |
| 140 | * |
| 141 | * @param array $entry The new entry to save. |
| 142 | */ |
| 143 | public function push( $entry ) { |
| 144 | $this->entries[] = $entry; |
| 145 | $this->entries = array_slice( $this->entries, - static::LIMIT ); |
| 146 | update_option( $this->get_option_name(), $this->entries, false ); |
| 147 | } |
| 148 | } |