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| 1 | <?php |
| 2 | /** |
| 3 | * Expiry_Wpcom: what the expiry notices ask WordPress.com, and remember. |
| 4 | * |
| 5 | * @package automattic/jetpack-mu-wpcom |
| 6 | */ |
| 7 | |
| 8 | declare( strict_types = 1 ); |
| 9 | |
| 10 | namespace Automattic\Jetpack\Jetpack_Mu_Wpcom\Expiry_Notices; |
| 11 | |
| 12 | use Automattic\Jetpack\Connection\Client; |
| 13 | |
| 14 | /** |
| 15 | * Every lookup here runs during a page load, so an answer is kept for hours |
| 16 | * and a failure for minutes: long enough not to retry an outage on every |
| 17 | * pageview, short enough not to hide a fact for half a day over one blip. |
| 18 | */ |
| 19 | class Expiry_Wpcom { |
| 20 | |
| 21 | const CACHE_TTL = 12 * HOUR_IN_SECONDS; |
| 22 | const FAILURE_TTL = 5 * MINUTE_IN_SECONDS; |
| 23 | |
| 24 | // Stored in place of an answer so a failed lookup is remembered too. |
| 25 | const NONE = 'none'; |
| 26 | |
| 27 | /** |
| 28 | * The remembered answer to a lookup, asking it once per cache period. |
| 29 | * |
| 30 | * @param string $cache_key Transient name. |
| 31 | * @param callable $lookup Returns the answer, or null when it could not be established. |
| 32 | * @return string|null |
| 33 | */ |
| 34 | public static function remember( string $cache_key, callable $lookup ): ?string { |
| 35 | $cached = get_transient( $cache_key ); |
| 36 | if ( false !== $cached ) { |
| 37 | return self::NONE === $cached ? null : (string) $cached; |
| 38 | } |
| 39 | |
| 40 | $value = $lookup(); |
| 41 | set_transient( $cache_key, $value ?? self::NONE, null === $value ? self::FAILURE_TTL : self::CACHE_TTL ); |
| 42 | return $value; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * GET a REST v1.2 path with the site's blog token, decoded, or null on any failure. |
| 47 | * |
| 48 | * @param string $path Path under the REST base; `%d` stands for the site's WordPress.com ID. |
| 49 | * @return mixed Decoded JSON body, or null. |
| 50 | */ |
| 51 | public static function get_as_blog( string $path ) { |
| 52 | $site_id = \Jetpack_Options::get_option( 'id' ); |
| 53 | if ( ! $site_id ) { |
| 54 | return null; |
| 55 | } |
| 56 | |
| 57 | $response = Client::wpcom_json_api_request_as_blog( |
| 58 | sprintf( $path, (int) $site_id ), |
| 59 | '1.2', |
| 60 | array( |
| 61 | 'method' => 'GET', |
| 62 | // A slow answer must not become a slow page. |
| 63 | 'timeout' => 5, |
| 64 | ), |
| 65 | null, |
| 66 | 'rest' |
| 67 | ); |
| 68 | |
| 69 | if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) { |
| 70 | return null; |
| 71 | } |
| 72 | |
| 73 | return json_decode( wp_remote_retrieve_body( $response ) ); |
| 74 | } |
| 75 | } |