| 1 |
<?php |
| 2 |
/** |
| 3 |
* Metric backfill. |
| 4 |
* |
| 5 |
* Metric extraction needs an extra round-trip to Google (a TTF copy, since |
| 6 |
* served woff2 can't be parsed without Brotli). Doing that during a visitor's |
| 7 |
* page render risks slow responses or timeouts, so it runs here instead — on |
| 8 |
* admin page loads, throttled and capped, fully off the front-end critical |
| 9 |
* path. The metric-matched fallback faces appear as soon as the backfill has |
| 10 |
* populated each family's metrics. |
| 11 |
* |
| 12 |
* @package EasyFonts |
| 13 |
*/ |
| 14 |
|
| 15 |
namespace EasyFonts\Fonts; |
| 16 |
|
| 17 |
use EasyFonts\Parser\FontMetricsReader; |
| 18 |
use EasyFonts\Settings; |
| 19 |
|
| 20 |
defined( 'ABSPATH' ) || exit; |
| 21 |
|
| 22 |
/** |
| 23 |
* Fills in font metrics for families that don't have them yet. |
| 24 |
*/ |
| 25 |
class MetricsBackfill { |
| 26 |
|
| 27 |
/** |
| 28 |
* Families processed per admin load. |
| 29 |
*/ |
| 30 |
const BATCH = 3; |
| 31 |
|
| 32 |
/** |
| 33 |
* Minimum seconds between backfill runs. |
| 34 |
*/ |
| 35 |
const THROTTLE = 60; |
| 36 |
|
| 37 |
/** |
| 38 |
* Register hooks. |
| 39 |
*/ |
| 40 |
public function boot(): void { |
| 41 |
add_action( 'admin_init', array( $this, 'maybe_run' ) ); |
| 42 |
} |
| 43 |
|
| 44 |
/** |
| 45 |
* Run a small backfill batch if due and enabled. |
| 46 |
*/ |
| 47 |
public function maybe_run(): void { |
| 48 |
if ( ! Settings::get( 'metric_fallbacks', 1 ) || ! Settings::get( 'enabled', 1 ) ) { |
| 49 |
return; |
| 50 |
} |
| 51 |
|
| 52 |
if ( get_transient( 'easyfonts_metrics_lock' ) ) { |
| 53 |
return; |
| 54 |
} |
| 55 |
|
| 56 |
$families = $this->families_missing_metrics( self::BATCH ); |
| 57 |
|
| 58 |
if ( empty( $families ) ) { |
| 59 |
return; |
| 60 |
} |
| 61 |
|
| 62 |
// Short lock so concurrent admin loads don't pile on Google requests. |
| 63 |
set_transient( 'easyfonts_metrics_lock', 1, self::THROTTLE ); |
| 64 |
|
| 65 |
$downloader = new Downloader(); |
| 66 |
$reader = new FontMetricsReader(); |
| 67 |
$registry = new Registry(); |
| 68 |
|
| 69 |
foreach ( $families as $family ) { |
| 70 |
$bytes = $downloader->fetch_family_ttf( $family['family'], (string) $family['weight'] ); |
| 71 |
|
| 72 |
if ( ! $bytes ) { |
| 73 |
continue; |
| 74 |
} |
| 75 |
|
| 76 |
$metrics = $reader->read( $bytes ); |
| 77 |
|
| 78 |
if ( $metrics ) { |
| 79 |
$registry->set_family_metrics( $family['family'], $metrics ); |
| 80 |
} |
| 81 |
} |
| 82 |
} |
| 83 |
|
| 84 |
/** |
| 85 |
* Find Google families with no metrics yet. |
| 86 |
* |
| 87 |
* @param int $limit Max families. |
| 88 |
* @return array<int,array{family:string,weight:string}> |
| 89 |
*/ |
| 90 |
private function families_missing_metrics( int $limit ): array { |
| 91 |
global $wpdb; |
| 92 |
|
| 93 |
$table = $wpdb->prefix . 'easyfonts_fonts'; |
| 94 |
|
| 95 |
// phpcs:ignore WordPress.DB.DirectDatabaseQuery |
| 96 |
$rows = $wpdb->get_results( |
| 97 |
$wpdb->prepare( |
| 98 |
"SELECT family, MIN(weight) AS weight |
| 99 |
FROM {$table} |
| 100 |
WHERE provider = 'google' AND ( metrics IS NULL OR metrics = '' ) |
| 101 |
GROUP BY family |
| 102 |
LIMIT %d", |
| 103 |
$limit |
| 104 |
), |
| 105 |
ARRAY_A |
| 106 |
); |
| 107 |
|
| 108 |
return $rows ? $rows : array(); |
| 109 |
} |
| 110 |
} |
| 111 |
|
