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| 1 | <?php |
| 2 | /** |
| 3 | * Represents a request to generate a pair of speed scores. |
| 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\Boost_API; |
| 11 | use Automattic\Jetpack\Boost_Core\Lib\Cacheable; |
| 12 | use Automattic\Jetpack\Boost_Core\Lib\Url; |
| 13 | |
| 14 | if ( ! defined( 'ABSPATH' ) ) { |
| 15 | exit( 0 ); |
| 16 | } |
| 17 | |
| 18 | /** |
| 19 | * Class Speed_Score_Request |
| 20 | */ |
| 21 | class Speed_Score_Request extends Cacheable { |
| 22 | /** |
| 23 | * Algorithm to use when defining a hash for the cache. |
| 24 | */ |
| 25 | const CACHE_KEY_HASH_ALGO = 'md5'; |
| 26 | |
| 27 | /** |
| 28 | * The URL to get the Speed Scores for. |
| 29 | * |
| 30 | * @var string $url Url to get the Speed Scores for. |
| 31 | */ |
| 32 | private $url; |
| 33 | |
| 34 | /** |
| 35 | * Active Jetpack Boost modules. |
| 36 | * |
| 37 | * @var string[] $active_modules Active modules. |
| 38 | */ |
| 39 | private $active_modules; |
| 40 | |
| 41 | /** |
| 42 | * When the Speed Scores request was created, in seconds since epoch. |
| 43 | * |
| 44 | * @var int|float $created Speed Scores request creation timestamp. |
| 45 | */ |
| 46 | private $created; |
| 47 | |
| 48 | /** |
| 49 | * Current status of the Speed Score request. |
| 50 | * |
| 51 | * @var string $status Speed Scores request status. |
| 52 | */ |
| 53 | private $status; |
| 54 | |
| 55 | /** |
| 56 | * Number of retries attempted. |
| 57 | * |
| 58 | * @var int $retry_count Number of times this Speed Score request has been retried. |
| 59 | */ |
| 60 | private $retry_count; |
| 61 | |
| 62 | /** |
| 63 | * When this request was last polled, in seconds since epoch. |
| 64 | * |
| 65 | * @var int|float|null $last_polled Last poll timestamp, or null before the first poll. |
| 66 | */ |
| 67 | private $last_polled; |
| 68 | |
| 69 | /** |
| 70 | * Seconds between this poll and the one before it (or the dispatch), set by poll_update(). |
| 71 | * |
| 72 | * @var float|null $poll_gap Gap in seconds, or null when not polled in this request. |
| 73 | */ |
| 74 | private $poll_gap; |
| 75 | |
| 76 | /** |
| 77 | * The error returned |
| 78 | * |
| 79 | * @var array $error Speed Scores error. |
| 80 | */ |
| 81 | private $error; |
| 82 | |
| 83 | /** |
| 84 | * Where the Speed Scores request was made from. |
| 85 | * |
| 86 | * @var string $client A string passed to Speed_Score to identify where the request was made from. |
| 87 | */ |
| 88 | private $client; |
| 89 | |
| 90 | /** |
| 91 | * Constructor. |
| 92 | * |
| 93 | * @param string $url The URL to get the Speed Scores for. |
| 94 | * @param array $active_modules Active modules. |
| 95 | * @param int|float|null $created When the Speed Scores request was created, in seconds since epoch. |
| 96 | * @param string $status Status of the Speed Scores request. |
| 97 | * @param null $error The Speed Scores error. |
| 98 | * @param string $client A string identifying where the request was made from. |
| 99 | */ |
| 100 | public function __construct( $url, $active_modules = array(), $created = null, $status = 'pending', $error = null, $client = null ) { |
| 101 | $this->set_cache_id( self::generate_cache_id_from_url( $url ) ); |
| 102 | |
| 103 | $this->url = $url; |
| 104 | $this->active_modules = $active_modules; |
| 105 | $this->created = $created === null ? microtime( true ) : $created; |
| 106 | $this->status = $status; |
| 107 | $this->error = $error; |
| 108 | $this->client = $client; |
| 109 | $this->retry_count = 0; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Generate the cache ID from the URL. |
| 114 | * |
| 115 | * @param string $url The URL to get the Speed Scores for. |
| 116 | * |
| 117 | * @return string |
| 118 | */ |
| 119 | public static function generate_cache_id_from_url( $url ) { |
| 120 | return hash( self::CACHE_KEY_HASH_ALGO, self::canonicalize_url( $url ) ); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Remove trailing path slashes while preserving the query string and fragment. |
| 125 | * |
| 126 | * Url::normalize() is no use here: it also removes the query argument that keeps the |
| 127 | * "without Boost" scores apart from the regular ones. |
| 128 | * |
| 129 | * @param string $url The URL. |
| 130 | * |
| 131 | * @return string |
| 132 | */ |
| 133 | private static function canonicalize_url( $url ) { |
| 134 | $path_length = strcspn( $url, '?#' ); |
| 135 | |
| 136 | return rtrim( substr( $url, 0, $path_length ), '/' ) . substr( $url, $path_length ); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Get the list of active performance modules while this request was created. |
| 141 | * |
| 142 | * @return string[] |
| 143 | */ |
| 144 | public function get_active_modules() { |
| 145 | return $this->active_modules; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * When this request was dispatched, or last restarted. |
| 150 | * |
| 151 | * @return int|float Seconds since epoch. |
| 152 | */ |
| 153 | public function get_created() { |
| 154 | return $this->created; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Seconds between the latest poll and the one before it, or null when not polled in this request. |
| 159 | * |
| 160 | * @return float|null |
| 161 | */ |
| 162 | public function get_poll_gap() { |
| 163 | return $this->poll_gap; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Convert this object to a plain array for JSON serialization. |
| 168 | */ |
| 169 | #[\ReturnTypeWillChange] |
| 170 | public function jsonSerialize() { |
| 171 | return array( |
| 172 | 'id' => $this->get_cache_id(), |
| 173 | 'url' => $this->url, |
| 174 | 'active_modules' => $this->get_active_modules(), |
| 175 | 'created' => $this->created, |
| 176 | 'status' => $this->status, |
| 177 | 'error' => $this->error, |
| 178 | 'client' => $this->client, |
| 179 | 'retry_count' => $this->retry_count, |
| 180 | 'last_polled' => $this->last_polled, |
| 181 | ); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * This is intended to be the reverse of JsonSerializable->jsonSerialize. |
| 186 | * |
| 187 | * @param mixed $data The data to turn into an object. |
| 188 | * |
| 189 | * @return Speed_Score_Request |
| 190 | */ |
| 191 | public static function jsonUnserialize( $data ) { |
| 192 | $object = new Speed_Score_Request( |
| 193 | $data['url'], |
| 194 | $data['active_modules'], |
| 195 | $data['created'], |
| 196 | $data['status'], |
| 197 | $data['error'], |
| 198 | $data['client'] |
| 199 | ); |
| 200 | |
| 201 | if ( ! empty( $data['id'] ) ) { |
| 202 | $object->set_cache_id( $data['id'] ); |
| 203 | } |
| 204 | |
| 205 | if ( ! empty( $data['retry_count'] ) ) { |
| 206 | $object->retry_count = intval( $data['retry_count'] ); |
| 207 | } |
| 208 | |
| 209 | if ( ! empty( $data['last_polled'] ) ) { |
| 210 | $object->last_polled = $data['last_polled']; |
| 211 | } |
| 212 | |
| 213 | return $object; |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Return the cache prefix. |
| 218 | * |
| 219 | * @return string |
| 220 | */ |
| 221 | protected static function cache_prefix() { |
| 222 | return 'jetpack_boost_speed_scores_'; |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Send a Speed Scores request to the API. |
| 227 | * |
| 228 | * @return true|\WP_Error True on success, WP_Error on failure. |
| 229 | */ |
| 230 | public function execute() { |
| 231 | $response = Boost_API::post( |
| 232 | 'speed-scores', |
| 233 | array( |
| 234 | 'request_id' => $this->get_cache_id(), |
| 235 | 'url' => Url::normalize( $this->url ), |
| 236 | 'active_modules' => $this->active_modules, |
| 237 | 'client' => $this->client, |
| 238 | ) |
| 239 | ); |
| 240 | |
| 241 | if ( is_wp_error( $response ) ) { |
| 242 | $this->status = 'error'; |
| 243 | $this->error = $response->get_error_message(); |
| 244 | $this->store(); |
| 245 | |
| 246 | return $response; |
| 247 | } |
| 248 | |
| 249 | return true; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Is this request pending? |
| 254 | */ |
| 255 | public function is_pending() { |
| 256 | return 'pending' === $this->status; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Did the request fail? |
| 261 | */ |
| 262 | public function is_error() { |
| 263 | return 'error' === $this->status; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Did the request succeed? |
| 268 | */ |
| 269 | public function is_success() { |
| 270 | return 'success' === $this->status; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Poll for updates to this Speed Scores request. |
| 275 | * |
| 276 | * @return true|\WP_Error True on success, WP_Error on failure. |
| 277 | */ |
| 278 | public function poll_update() { |
| 279 | $now = microtime( true ); |
| 280 | $this->poll_gap = $now - ( $this->last_polled ?? $this->created ); |
| 281 | $this->last_polled = $now; |
| 282 | |
| 283 | $response = Boost_API::get( |
| 284 | sprintf( |
| 285 | 'speed-scores/%s', |
| 286 | $this->get_cache_id() |
| 287 | ) |
| 288 | ); |
| 289 | |
| 290 | if ( is_wp_error( $response ) ) { |
| 291 | // Special case: If the request is not found, restart it. |
| 292 | if ( 'not_found' === $response->get_error_code() ) { |
| 293 | return $this->restart(); |
| 294 | } |
| 295 | |
| 296 | return $response; |
| 297 | } |
| 298 | |
| 299 | switch ( $response['status'] ) { |
| 300 | case 'pending': |
| 301 | // The initial job probably failed, dispatch again if so. |
| 302 | if ( $this->created <= strtotime( '-15 mins' ) ) { |
| 303 | return $this->restart(); |
| 304 | } |
| 305 | // As long as WordPress.com keeps the result; the default would drop a run the user left mid-way. |
| 306 | $this->store( 3600 ); |
| 307 | break; |
| 308 | |
| 309 | case 'error': |
| 310 | $this->status = 'error'; |
| 311 | $this->error = $response['error']; |
| 312 | $this->store(); |
| 313 | break; |
| 314 | |
| 315 | case 'success': |
| 316 | $this->status = 'success'; |
| 317 | $this->store(); |
| 318 | $this->record_history( $response ); |
| 319 | |
| 320 | break; |
| 321 | |
| 322 | default: |
| 323 | return new \WP_Error( |
| 324 | 'invalid_response', |
| 325 | __( |
| 326 | 'Invalid response from WPCOM API while polling for speed scores', |
| 327 | 'jetpack-boost-speed-score' |
| 328 | ), |
| 329 | $response |
| 330 | ); |
| 331 | } |
| 332 | |
| 333 | return true; |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Restart this request; useful when WPCOM doesn't recognize the request or it times out. |
| 338 | */ |
| 339 | private function restart() { |
| 340 | // Enforce a maximum number of restarts. |
| 341 | if ( $this->retry_count > 2 ) { |
| 342 | $this->status = 'error'; |
| 343 | $this->error = 'Maximum number of retries exceeded'; |
| 344 | $this->store(); |
| 345 | |
| 346 | return new \WP_Error( |
| 347 | 'error', |
| 348 | $this->error |
| 349 | ); |
| 350 | } |
| 351 | |
| 352 | $result = $this->execute(); |
| 353 | if ( is_wp_error( $result ) ) { |
| 354 | return $result; |
| 355 | } |
| 356 | |
| 357 | $this->created = time(); |
| 358 | ++$this->retry_count; |
| 359 | $this->store(); |
| 360 | |
| 361 | return true; |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * Save the speed score record to history. |
| 366 | * |
| 367 | * @param array $response Response from api. |
| 368 | */ |
| 369 | private function record_history( $response ) { |
| 370 | $history = new Speed_Score_History( $this->url ); |
| 371 | $last_history = $history->latest(); |
| 372 | $last_scores = $last_history ? $last_history['scores'] : null; |
| 373 | $last_theme = $last_history['theme'] ?? null; // Entries saved before the theme was recorded have no theme key. |
| 374 | $current_theme = wp_get_theme()->get( 'Name' ); |
| 375 | |
| 376 | // Scores describe the site as it stood when the run was dispatched, so judge staleness |
| 377 | // against that instant. |
| 378 | $measured_current_site = $this->created >= Speed_Score_History::get_stale_timestamp(); |
| 379 | |
| 380 | // Only change if there is a difference from last score or the theme changed. |
| 381 | if ( $last_scores !== $response['scores'] || $current_theme !== $last_theme ) { |
| 382 | $history->push( |
| 383 | array( |
| 384 | 'timestamp' => $measured_current_site ? time() : (int) $this->created, |
| 385 | 'scores' => $response['scores'], |
| 386 | 'theme' => $current_theme, |
| 387 | ) |
| 388 | ); |
| 389 | } elseif ( $measured_current_site ) { |
| 390 | $history->touch_latest(); |
| 391 | } |
| 392 | } |
| 393 | } |