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| 1 | <?php |
| 2 | /** |
| 3 | * How long this site's recent speed score runs took. |
| 4 | * |
| 5 | * @package automattic/jetpack-boost-speed-score |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Boost_Speed_Score; |
| 9 | |
| 10 | if ( ! defined( 'ABSPATH' ) ) { |
| 11 | exit( 0 ); |
| 12 | } |
| 13 | |
| 14 | /** |
| 15 | * Class Speed_Score_Durations |
| 16 | */ |
| 17 | class Speed_Score_Durations { |
| 18 | const OPTION_NAME = 'jetpack_boost_speed_score_durations'; |
| 19 | |
| 20 | /** |
| 21 | * Number of recent runs to keep. |
| 22 | */ |
| 23 | const LIMIT = 5; |
| 24 | |
| 25 | /** |
| 26 | * Expected run length before this site has finished one: roughly the fleet average plus one 5 s poll. |
| 27 | */ |
| 28 | const DEFAULT_SECONDS = 40; |
| 29 | |
| 30 | /** |
| 31 | * Longest run worth recording; the dashboard stops polling at 4 minutes, so anything longer |
| 32 | * means nobody was watching when the run finished. |
| 33 | */ |
| 34 | const MAX_SECONDS = 240; |
| 35 | |
| 36 | /** |
| 37 | * A dashboard watching a run polls every 5 s, so a longer gap before the final poll means |
| 38 | * nobody was watching when it finished. |
| 39 | */ |
| 40 | const WATCHED_POLL_GAP = 15; |
| 41 | |
| 42 | /** |
| 43 | * Record the run once the last of its requests succeeds, timed from the earliest dispatch. |
| 44 | * |
| 45 | * @param Speed_Score_Request[] $polled Requests that were pending before this poll. |
| 46 | */ |
| 47 | public static function record_finished_run( array $polled ) { |
| 48 | if ( empty( $polled ) ) { |
| 49 | return; |
| 50 | } |
| 51 | |
| 52 | $started = microtime( true ); |
| 53 | foreach ( $polled as $request ) { |
| 54 | if ( ! $request->is_success() || $request->get_poll_gap() > self::WATCHED_POLL_GAP ) { |
| 55 | return; |
| 56 | } |
| 57 | $started = min( $started, $request->get_created() ); |
| 58 | } |
| 59 | |
| 60 | self::record( microtime( true ) - $started ); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Record how long a finished run took. |
| 65 | * |
| 66 | * @param int|float $seconds Seconds from dispatch to the poll that saw the result. |
| 67 | */ |
| 68 | public static function record( $seconds ) { |
| 69 | $seconds = (int) round( $seconds ); |
| 70 | if ( $seconds <= 0 || $seconds > self::MAX_SECONDS ) { |
| 71 | return; |
| 72 | } |
| 73 | |
| 74 | $durations = self::all(); |
| 75 | $durations[] = $seconds; |
| 76 | update_option( self::OPTION_NAME, array_slice( $durations, - self::LIMIT ), false ); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * How long the next run is likely to take, in seconds. |
| 81 | * |
| 82 | * @return int |
| 83 | */ |
| 84 | public static function expected() { |
| 85 | $durations = self::all(); |
| 86 | if ( empty( $durations ) ) { |
| 87 | return self::DEFAULT_SECONDS; |
| 88 | } |
| 89 | |
| 90 | sort( $durations ); |
| 91 | $middle = intdiv( count( $durations ), 2 ); |
| 92 | if ( count( $durations ) % 2 ) { |
| 93 | return $durations[ $middle ]; |
| 94 | } |
| 95 | |
| 96 | return (int) round( ( $durations[ $middle - 1 ] + $durations[ $middle ] ) / 2 ); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Recorded durations, oldest first. |
| 101 | * |
| 102 | * @return int[] |
| 103 | */ |
| 104 | private static function all() { |
| 105 | $durations = get_option( self::OPTION_NAME, array() ); |
| 106 | |
| 107 | return is_array( $durations ) ? array_values( array_map( 'intval', $durations ) ) : array(); |
| 108 | } |
| 109 | } |