| 1 |
<?php |
| 2 |
/** |
| 3 |
* Score — external performance scores on the dashboard (issue #47). |
| 4 |
* |
| 5 |
* Users judge a caching plugin by its GTmetrix or PageSpeed score whether |
| 6 |
* or not the plugin shows one, so the number belongs next to the internal |
| 7 |
* TTFB benchmark rather than one tab away. Both live on the same timeline: |
| 8 |
* "expiry raised → TTFB fell → score climbed" is the story the dashboard |
| 9 |
* exists to tell, and it can't be told from two different tools. |
| 10 |
* |
| 11 |
* Two providers, deliberately different in shape: |
| 12 |
* |
| 13 |
* psi Google PageSpeed Insights v5. Synchronous, and works with NO |
| 14 |
* key (Google rate-limits anonymous callers). A key raises the |
| 15 |
* quota; it is optional, not required. |
| 16 |
* gtmetrix GTmetrix API v2. Asynchronous by design — you start a test, |
| 17 |
* it queues, and you poll. Requires an API key; there is no |
| 18 |
* anonymous mode. |
| 19 |
* |
| 20 |
* Outbound HTTP is opt-in and user-initiated: nothing here runs unless the |
| 21 |
* module is enabled AND someone presses Test / runs the command. There is |
| 22 |
* no schedule, no background call, no telemetry — see readme.txt "External |
| 23 |
* services". |
| 24 |
* |
| 25 |
* Storage: `xspeed_score_history`, capped, autoload off. The row shape |
| 26 |
* matches what Pro's Pagespeed engine already returns (ok/status/url/ |
| 27 |
* strategy/score/metrics/issues) so a Pro run and a Free run are the same |
| 28 |
* kind of row and the history stays one series. |
| 29 |
* |
| 30 |
* @package XSpeed |
| 31 |
*/ |
| 32 |
|
| 33 |
declare(strict_types=1); |
| 34 |
|
| 35 |
namespace XSpeed; |
| 36 |
|
| 37 |
defined( 'ABSPATH' ) || exit; |
| 38 |
|
| 39 |
final class Score { |
| 40 |
|
| 41 |
public const HISTORY_OPTION = 'xspeed_score_history'; |
| 42 |
public const PENDING_OPTION = 'xspeed_score_pending'; |
| 43 |
|
| 44 |
/** Runs kept. Enough for a trend, small enough to stay a single option. */ |
| 45 |
public const MAX_HISTORY = 30; |
| 46 |
|
| 47 |
public const PSI_ENDPOINT = 'https://www.googleapis.com/pagespeedonline/v5/runPagespeed'; |
| 48 |
public const GTMETRIX_ENDPOINT = 'https://gtmetrix.com/api/2.0/tests'; |
| 49 |
|
| 50 |
/** Seconds allowed for the PSI call. Lighthouse runs are genuinely slow. */ |
| 51 |
public const PSI_TIMEOUT = 60; |
| 52 |
|
| 53 |
/** |
| 54 |
* How long a queued GTmetrix test may stay pending before we give up on |
| 55 |
* it. Without a ceiling, a start that never resolves leaves a marker |
| 56 |
* that polls a third-party API on every status check, forever. |
| 57 |
*/ |
| 58 |
public const PENDING_MAX_AGE = 1800; |
| 59 |
|
| 60 |
/* ------------------------------------------------------------------ */ |
| 61 |
/* PageSpeed Insights */ |
| 62 |
/* ------------------------------------------------------------------ */ |
| 63 |
|
| 64 |
/** |
| 65 |
* Build the PSI request URL. |
| 66 |
* |
| 67 |
* Pure, and separated from the call so the query — especially "no key |
| 68 |
* means no key parameter", not `key=` — is testable without network. |
| 69 |
*/ |
| 70 |
public static function psi_url( string $url, string $strategy, string $api_key = '' ): string { |
| 71 |
$query = array( |
| 72 |
'url' => $url, |
| 73 |
'strategy' => 'desktop' === strtolower( $strategy ) ? 'desktop' : 'mobile', |
| 74 |
'category' => 'performance', |
| 75 |
); |
| 76 |
if ( '' !== trim( $api_key ) ) { |
| 77 |
$query['key'] = trim( $api_key ); |
| 78 |
} |
| 79 |
return self::PSI_ENDPOINT . '?' . http_build_query( $query ); |
| 80 |
} |
| 81 |
|
| 82 |
/** |
| 83 |
* Pull the score and Core Web Vitals out of a PSI envelope. |
| 84 |
* |
| 85 |
* Public so tests can drive it with canned fixtures — the parsing, not |
| 86 |
* the HTTP, is where this breaks when Google reshuffles the response. |
| 87 |
* |
| 88 |
* @param array $envelope Decoded PSI JSON. |
| 89 |
* @return array<string,mixed> |
| 90 |
*/ |
| 91 |
public static function parse_psi( string $url, string $strategy, array $envelope ): array { |
| 92 |
$lh = isset( $envelope['lighthouseResult'] ) && is_array( $envelope['lighthouseResult'] ) ? $envelope['lighthouseResult'] : array(); |
| 93 |
$audits = isset( $lh['audits'] ) && is_array( $lh['audits'] ) ? $lh['audits'] : array(); |
| 94 |
|
| 95 |
$raw_score = isset( $lh['categories']['performance']['score'] ) ? $lh['categories']['performance']['score'] : null; |
| 96 |
// PSI reports 0-1; a missing score is null, NOT zero — "we didn't get |
| 97 |
// a score" and "your score is 0" are very different news. |
| 98 |
$score = is_numeric( $raw_score ) ? (int) round( ( (float) $raw_score ) * 100 ) : null; |
| 99 |
|
| 100 |
return array( |
| 101 |
'ok' => true, |
| 102 |
'provider' => 'psi', |
| 103 |
'ts' => time(), |
| 104 |
'url' => $url, |
| 105 |
'strategy' => 'desktop' === strtolower( $strategy ) ? 'desktop' : 'mobile', |
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'score' => $score, |
| 107 |
'metrics' => array( |
| 108 |
'lcp' => self::audit_number( $audits, 'largest-contentful-paint' ), |
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'fcp' => self::audit_number( $audits, 'first-contentful-paint' ), |
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'cls' => self::audit_number( $audits, 'cumulative-layout-shift' ), |
| 111 |
'tbt' => self::audit_number( $audits, 'total-blocking-time' ), |
| 112 |
'si' => self::audit_number( $audits, 'speed-index' ), |
| 113 |
'ttfb' => self::audit_number( $audits, 'server-response-time' ), |
| 114 |
), |
| 115 |
'issues' => self::top_issues( $audits ), |
| 116 |
'error' => '', |
| 117 |
); |
| 118 |
} |
| 119 |
|
| 120 |
/** |
| 121 |
* Numeric value of one Lighthouse audit, or null when absent. |
| 122 |
* |
| 123 |
* @param array $audits Lighthouse audits keyed by id. |
| 124 |
*/ |
| 125 |
private static function audit_number( array $audits, string $id ): ?float { |
| 126 |
if ( ! isset( $audits[ $id ] ) || ! is_array( $audits[ $id ] ) ) { |
| 127 |
return null; |
| 128 |
} |
| 129 |
$value = $audits[ $id ]['numericValue'] ?? null; |
| 130 |
return is_numeric( $value ) ? (float) $value : null; |
| 131 |
} |
| 132 |
|
| 133 |
/** |
| 134 |
* The opportunities worth showing: biggest measured savings first. |
| 135 |
* |
| 136 |
* Capped at 5 — a dashboard card is not an audit report, and a list |
| 137 |
* nobody reads to the end is a list that buries its own first item. |
| 138 |
* |
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* @param array $audits Lighthouse audits keyed by id. |
| 140 |
* @return array<int,array<string,mixed>> |
| 141 |
*/ |
| 142 |
public static function top_issues( array $audits ): array { |
| 143 |
$issues = array(); |
| 144 |
foreach ( $audits as $id => $audit ) { |
| 145 |
if ( ! is_array( $audit ) ) { |
| 146 |
continue; |
| 147 |
} |
| 148 |
$savings = isset( $audit['details']['overallSavingsMs'] ) && is_numeric( $audit['details']['overallSavingsMs'] ) |
| 149 |
? (int) $audit['details']['overallSavingsMs'] |
| 150 |
: 0; |
| 151 |
if ( $savings <= 0 ) { |
| 152 |
continue; |
| 153 |
} |
| 154 |
$issues[] = array( |
| 155 |
'id' => (string) $id, |
| 156 |
'title' => isset( $audit['title'] ) ? (string) $audit['title'] : (string) $id, |
| 157 |
'savings_ms' => $savings, |
| 158 |
); |
| 159 |
} |
| 160 |
|
| 161 |
usort( |
| 162 |
$issues, |
| 163 |
static function ( array $a, array $b ): int { |
| 164 |
return $b['savings_ms'] <=> $a['savings_ms']; |
| 165 |
} |
| 166 |
); |
| 167 |
|
| 168 |
return array_slice( $issues, 0, 5 ); |
| 169 |
} |
| 170 |
|
| 171 |
/** |
| 172 |
* Run a PageSpeed Insights audit and record it. |
| 173 |
* |
| 174 |
* @return array<string,mixed> A history row (ok=false carries `error`). |
| 175 |
*/ |
| 176 |
public static function run_psi( string $url, string $strategy = 'mobile', string $api_key = '' ): array { |
| 177 |
$response = wp_remote_get( |
| 178 |
self::psi_url( $url, $strategy, $api_key ), |
| 179 |
array( 'timeout' => self::PSI_TIMEOUT ) |
| 180 |
); |
| 181 |
|
| 182 |
if ( is_wp_error( $response ) ) { |
| 183 |
return self::failure( 'psi', $url, $strategy, $response->get_error_message() ); |
| 184 |
} |
| 185 |
|
| 186 |
$code = (int) wp_remote_retrieve_response_code( $response ); |
| 187 |
$json = json_decode( (string) wp_remote_retrieve_body( $response ), true ); |
| 188 |
|
| 189 |
if ( $code >= 400 || ! is_array( $json ) ) { |
| 190 |
$message = is_array( $json ) && isset( $json['error']['message'] ) |
| 191 |
? (string) $json['error']['message'] |
| 192 |
: sprintf( |
| 193 |
/* translators: %d: HTTP status code. */ |
| 194 |
__( 'PageSpeed Insights returned HTTP %d.', 'xspeed' ), |
| 195 |
$code |
| 196 |
); |
| 197 |
return self::failure( 'psi', $url, $strategy, $message ); |
| 198 |
} |
| 199 |
|
| 200 |
$row = self::parse_psi( $url, $strategy, $json ); |
| 201 |
self::record( $row ); |
| 202 |
return $row; |
| 203 |
} |
| 204 |
|
| 205 |
/* ------------------------------------------------------------------ */ |
| 206 |
/* GTmetrix */ |
| 207 |
/* ------------------------------------------------------------------ */ |
| 208 |
|
| 209 |
/** |
| 210 |
* The Authorization header GTmetrix v2 expects. |
| 211 |
* |
| 212 |
* HTTP Basic with the API key as the username and an EMPTY password — |
| 213 |
* the trailing colon is load-bearing, and omitting it authenticates as |
| 214 |
* nobody with a 401 that reads like a bad key. |
| 215 |
*/ |
| 216 |
public static function gtmetrix_auth_header( string $api_key ): string { |
| 217 |
return 'Basic ' . base64_encode( trim( $api_key ) . ':' ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode -- HTTP Basic auth encoding, not obfuscation. |
| 218 |
} |
| 219 |
|
| 220 |
/** |
| 221 |
* Body for "start a test". GTmetrix speaks JSON:API, so the URL is |
| 222 |
* nested under data.attributes rather than posted flat. |
| 223 |
* |
| 224 |
* Pure — the shape is easy to get subtly wrong and impossible to |
| 225 |
* notice, because a malformed body returns a generic 400. |
| 226 |
*/ |
| 227 |
public static function gtmetrix_start_body( string $url ): string { |
| 228 |
return (string) wp_json_encode( |
| 229 |
array( |
| 230 |
'data' => array( |
| 231 |
'type' => 'test', |
| 232 |
'attributes' => array( 'url' => $url ), |
| 233 |
), |
| 234 |
) |
| 235 |
); |
| 236 |
} |
| 237 |
|
| 238 |
/** |
| 239 |
* Read a GTmetrix test envelope into either a pending marker or a |
| 240 |
* finished history row. |
| 241 |
* |
| 242 |
* The API reports progress through `data.attributes.state` |
| 243 |
* (queued / started / completed / error). Anything that is not |
| 244 |
* `completed` is still in flight — treating an unknown state as done |
| 245 |
* would record a row with no score in it. |
| 246 |
* |
| 247 |
* @param array $envelope Decoded GTmetrix JSON. |
| 248 |
* @return array<string,mixed> |
| 249 |
*/ |
| 250 |
public static function parse_gtmetrix( string $url, array $envelope ): array { |
| 251 |
$data = isset( $envelope['data'] ) && is_array( $envelope['data'] ) ? $envelope['data'] : array(); |
| 252 |
$attributes = isset( $data['attributes'] ) && is_array( $data['attributes'] ) ? $data['attributes'] : array(); |
| 253 |
$state = isset( $attributes['state'] ) ? (string) $attributes['state'] : ''; |
| 254 |
$test_id = isset( $data['id'] ) ? (string) $data['id'] : ''; |
| 255 |
|
| 256 |
if ( 'error' === $state ) { |
| 257 |
$row = self::failure( |
| 258 |
'gtmetrix', |
| 259 |
$url, |
| 260 |
'desktop', |
| 261 |
isset( $attributes['error'] ) && '' !== (string) $attributes['error'] |
| 262 |
? (string) $attributes['error'] |
| 263 |
: __( 'GTmetrix reported the test failed.', 'xspeed' ) |
| 264 |
); |
| 265 |
$row['state'] = 'error'; |
| 266 |
return $row; |
| 267 |
} |
| 268 |
|
| 269 |
if ( 'completed' !== $state ) { |
| 270 |
return array( |
| 271 |
'ok' => true, |
| 272 |
'provider' => 'gtmetrix', |
| 273 |
'state' => '' === $state ? 'queued' : $state, |
| 274 |
'test_id' => $test_id, |
| 275 |
'url' => $url, |
| 276 |
'pending' => true, |
| 277 |
); |
| 278 |
} |
| 279 |
|
| 280 |
// GTmetrix reports Performance/Structure as 0-1 and the vitals in |
| 281 |
// milliseconds, with CLS unitless — the same units PSI uses, which |
| 282 |
// is why both providers can share one history shape. |
| 283 |
// GTmetrix has shipped this both ways: API 2.0 returns an integer |
| 284 |
// 0-100, older/other shapes a 0-1 fraction. Scaling unconditionally |
| 285 |
// turned a real 96 into 9600. Treat >1 as already-percent — a genuine |
| 286 |
// fractional score above 1 does not exist. |
| 287 |
$score = self::percent( $attributes['performance_score'] ?? null ); |
| 288 |
|
| 289 |
return array( |
| 290 |
'ok' => true, |
| 291 |
'provider' => 'gtmetrix', |
| 292 |
'state' => 'completed', |
| 293 |
'test_id' => $test_id, |
| 294 |
'ts' => time(), |
| 295 |
'url' => $url, |
| 296 |
'strategy' => 'desktop', |
| 297 |
'score' => $score, |
| 298 |
'metrics' => array( |
| 299 |
'lcp' => self::numeric( $attributes['largest_contentful_paint'] ?? null ), |
| 300 |
'fcp' => self::numeric( $attributes['first_contentful_paint'] ?? null ), |
| 301 |
'cls' => self::numeric( $attributes['cumulative_layout_shift'] ?? null ), |
| 302 |
'tbt' => self::numeric( $attributes['total_blocking_time'] ?? null ), |
| 303 |
'si' => self::numeric( $attributes['speed_index'] ?? null ), |
| 304 |
'ttfb' => self::numeric( $attributes['time_to_first_byte'] ?? null ), |
| 305 |
), |
| 306 |
'issues' => array(), |
| 307 |
'error' => '', |
| 308 |
); |
| 309 |
} |
| 310 |
|
| 311 |
/** |
| 312 |
* Start a GTmetrix test. Returns the pending marker; the result |
| 313 |
* arrives via poll_gtmetrix(). |
| 314 |
* |
| 315 |
* @return array<string,mixed>|\WP_Error |
| 316 |
*/ |
| 317 |
public static function start_gtmetrix( string $url, string $api_key ) { |
| 318 |
if ( '' === trim( $api_key ) ) { |
| 319 |
return new \WP_Error( |
| 320 |
'xspeed_score_no_key', |
| 321 |
__( 'GTmetrix requires an API key — there is no anonymous mode. Add one in the Score settings.', 'xspeed' ), |
| 322 |
array( 'status' => 400 ) |
| 323 |
); |
| 324 |
} |
| 325 |
|
| 326 |
$response = wp_remote_post( |
| 327 |
self::GTMETRIX_ENDPOINT, |
| 328 |
array( |
| 329 |
'timeout' => 30, |
| 330 |
'headers' => array( |
| 331 |
'Authorization' => self::gtmetrix_auth_header( $api_key ), |
| 332 |
'Content-Type' => 'application/vnd.api+json', |
| 333 |
), |
| 334 |
'body' => self::gtmetrix_start_body( $url ), |
| 335 |
) |
| 336 |
); |
| 337 |
|
| 338 |
if ( is_wp_error( $response ) ) { |
| 339 |
return $response; |
| 340 |
} |
| 341 |
|
| 342 |
$code = (int) wp_remote_retrieve_response_code( $response ); |
| 343 |
$json = json_decode( (string) wp_remote_retrieve_body( $response ), true ); |
| 344 |
|
| 345 |
if ( $code >= 400 || ! is_array( $json ) ) { |
| 346 |
return new \WP_Error( |
| 347 |
'xspeed_score_gtmetrix_failed', |
| 348 |
sprintf( |
| 349 |
/* translators: %d: HTTP status code. */ |
| 350 |
__( 'GTmetrix returned HTTP %d. Check the API key.', 'xspeed' ), |
| 351 |
$code |
| 352 |
), |
| 353 |
array( 'status' => 502 ) |
| 354 |
); |
| 355 |
} |
| 356 |
|
| 357 |
$parsed = self::parse_gtmetrix( $url, $json ); |
| 358 |
if ( ! empty( $parsed['test_id'] ) ) { |
| 359 |
update_option( |
| 360 |
self::PENDING_OPTION, |
| 361 |
array( |
| 362 |
'test_id' => (string) $parsed['test_id'], |
| 363 |
'url' => $url, |
| 364 |
'started' => time(), |
| 365 |
'provider' => 'gtmetrix', |
| 366 |
), |
| 367 |
false |
| 368 |
); |
| 369 |
} |
| 370 |
return $parsed; |
| 371 |
} |
| 372 |
|
| 373 |
/** |
| 374 |
* Check the in-flight GTmetrix test, recording it if it finished. |
| 375 |
* |
| 376 |
* @return array<string,mixed>|\WP_Error |
| 377 |
*/ |
| 378 |
public static function poll_gtmetrix( string $api_key ) { |
| 379 |
$pending = get_option( self::PENDING_OPTION, array() ); |
| 380 |
if ( ! is_array( $pending ) || empty( $pending['test_id'] ) ) { |
| 381 |
return array( |
| 382 |
'pending' => false, |
| 383 |
'state' => 'idle', |
| 384 |
); |
| 385 |
} |
| 386 |
|
| 387 |
$response = wp_remote_get( |
| 388 |
self::GTMETRIX_ENDPOINT . '/' . rawurlencode( (string) $pending['test_id'] ), |
| 389 |
array( |
| 390 |
'timeout' => 30, |
| 391 |
'headers' => array( 'Authorization' => self::gtmetrix_auth_header( $api_key ) ), |
| 392 |
) |
| 393 |
); |
| 394 |
|
| 395 |
if ( is_wp_error( $response ) ) { |
| 396 |
return $response; |
| 397 |
} |
| 398 |
|
| 399 |
$json = json_decode( (string) wp_remote_retrieve_body( $response ), true ); |
| 400 |
if ( ! is_array( $json ) ) { |
| 401 |
return new \WP_Error( |
| 402 |
'xspeed_score_gtmetrix_failed', |
| 403 |
__( 'GTmetrix returned an unreadable response.', 'xspeed' ), |
| 404 |
array( 'status' => 502 ) |
| 405 |
); |
| 406 |
} |
| 407 |
|
| 408 |
$parsed = self::parse_gtmetrix( (string) ( $pending['url'] ?? '' ), $json ); |
| 409 |
|
| 410 |
if ( empty( $parsed['pending'] ) ) { |
| 411 |
// Terminal, either way — stop polling a test that has resolved. |
| 412 |
delete_option( self::PENDING_OPTION ); |
| 413 |
if ( ! empty( $parsed['ok'] ) ) { |
| 414 |
self::record( $parsed ); |
| 415 |
} |
| 416 |
} |
| 417 |
|
| 418 |
return $parsed; |
| 419 |
} |
| 420 |
|
| 421 |
/* ------------------------------------------------------------------ */ |
| 422 |
/* History */ |
| 423 |
/* ------------------------------------------------------------------ */ |
| 424 |
|
| 425 |
/** |
| 426 |
* Append a run. Newest first, capped, autoload off — the history is |
| 427 |
* only ever read in admin contexts. |
| 428 |
* |
| 429 |
* @param array<string,mixed> $row A parsed run. |
| 430 |
*/ |
| 431 |
public static function record( array $row ): void { |
| 432 |
// The table is the store. It is created on activation and on |
| 433 |
// admin_init, but record() can run from CLI on a site that has done |
| 434 |
// neither yet, so make sure it exists before writing. |
| 435 |
Score_Store::maybe_install(); |
| 436 |
Score_Store::insert( $row, isset( $row['source'] ) ? (string) $row['source'] : 'local' ); |
| 437 |
|
| 438 |
$history = self::history_option(); |
| 439 |
array_unshift( $history, $row ); |
| 440 |
if ( count( $history ) > self::MAX_HISTORY ) { |
| 441 |
$history = array_slice( $history, 0, self::MAX_HISTORY ); |
| 442 |
} |
| 443 |
|
| 444 |
if ( false === get_option( self::HISTORY_OPTION, false ) ) { |
| 445 |
add_option( self::HISTORY_OPTION, $history, '', 'no' ); |
| 446 |
return; |
| 447 |
} |
| 448 |
update_option( self::HISTORY_OPTION, $history ); |
| 449 |
} |
| 450 |
|
| 451 |
/** |
| 452 |
* Stored runs, newest first. |
| 453 |
* |
| 454 |
* @return array<int,array<string,mixed>> |
| 455 |
*/ |
| 456 |
public static function history(): array { |
| 457 |
Score_Store::maybe_install(); |
| 458 |
$rows = Score_Store::history( self::MAX_HISTORY ); |
| 459 |
if ( ! empty( $rows ) ) { |
| 460 |
return $rows; |
| 461 |
} |
| 462 |
// Empty table on a site whose migration has not run yet — fall back |
| 463 |
// so the panel never looks like it lost the user's history. |
| 464 |
return self::history_option(); |
| 465 |
} |
| 466 |
|
| 467 |
/** |
| 468 |
* The legacy option-based history. |
| 469 |
* |
| 470 |
* Retained for the one-time migration in Score_Store and as a fallback, |
| 471 |
* NOT as a second source of truth. Nothing else should call it. |
| 472 |
* |
| 473 |
* @return array<int,array<string,mixed>> |
| 474 |
*/ |
| 475 |
private static function history_option(): array { |
| 476 |
$raw = get_option( self::HISTORY_OPTION, array() ); |
| 477 |
if ( ! is_array( $raw ) ) { |
| 478 |
return array(); |
| 479 |
} |
| 480 |
$out = array(); |
| 481 |
foreach ( $raw as $row ) { |
| 482 |
if ( is_array( $row ) && isset( $row['ts'] ) ) { |
| 483 |
$out[] = $row; |
| 484 |
} |
| 485 |
} |
| 486 |
return $out; |
| 487 |
} |
| 488 |
|
| 489 |
/** Most recent successful run, or null. */ |
| 490 |
public static function latest(): ?array { |
| 491 |
foreach ( self::history() as $row ) { |
| 492 |
if ( ! empty( $row['ok'] ) ) { |
| 493 |
return $row; |
| 494 |
} |
| 495 |
} |
| 496 |
return null; |
| 497 |
} |
| 498 |
|
| 499 |
public static function clear(): void { |
| 500 |
delete_option( self::HISTORY_OPTION ); |
| 501 |
delete_option( self::PENDING_OPTION ); |
| 502 |
} |
| 503 |
|
| 504 |
/* ------------------------------------------------------------------ */ |
| 505 |
/* Core Web Vitals thresholds */ |
| 506 |
/* ------------------------------------------------------------------ */ |
| 507 |
|
| 508 |
/** |
| 509 |
* Google's published Core Web Vitals thresholds, in the units the |
| 510 |
* metrics arrive in (ms, except CLS which is unitless). |
| 511 |
* |
| 512 |
* @return array<string,array{good:float,poor:float}> |
| 513 |
*/ |
| 514 |
public static function thresholds(): array { |
| 515 |
return array( |
| 516 |
'lcp' => array( |
| 517 |
'good' => 2500.0, |
| 518 |
'poor' => 4000.0, |
| 519 |
), |
| 520 |
'fcp' => array( |
| 521 |
'good' => 1800.0, |
| 522 |
'poor' => 3000.0, |
| 523 |
), |
| 524 |
'cls' => array( |
| 525 |
'good' => 0.1, |
| 526 |
'poor' => 0.25, |
| 527 |
), |
| 528 |
'tbt' => array( |
| 529 |
'good' => 200.0, |
| 530 |
'poor' => 600.0, |
| 531 |
), |
| 532 |
'si' => array( |
| 533 |
'good' => 3400.0, |
| 534 |
'poor' => 5800.0, |
| 535 |
), |
| 536 |
'ttfb' => array( |
| 537 |
'good' => 800.0, |
| 538 |
'poor' => 1800.0, |
| 539 |
), |
| 540 |
); |
| 541 |
} |
| 542 |
|
| 543 |
/** |
| 544 |
* Rate one metric good / needs-improvement / poor. |
| 545 |
* |
| 546 |
* Returns 'unknown' for a missing value rather than defaulting to |
| 547 |
* 'poor' — a chip that says "poor" because we have no measurement is a |
| 548 |
* false alarm someone will chase. |
| 549 |
*/ |
| 550 |
public static function rate( string $metric, ?float $value ): string { |
| 551 |
$thresholds = self::thresholds(); |
| 552 |
if ( null === $value || ! isset( $thresholds[ $metric ] ) ) { |
| 553 |
return 'unknown'; |
| 554 |
} |
| 555 |
if ( $value <= $thresholds[ $metric ]['good'] ) { |
| 556 |
return 'good'; |
| 557 |
} |
| 558 |
if ( $value <= $thresholds[ $metric ]['poor'] ) { |
| 559 |
return 'needs-improvement'; |
| 560 |
} |
| 561 |
return 'poor'; |
| 562 |
} |
| 563 |
|
| 564 |
/* ------------------------------------------------------------------ */ |
| 565 |
/* Helpers */ |
| 566 |
/* ------------------------------------------------------------------ */ |
| 567 |
|
| 568 |
/** |
| 569 |
* A failed run, in the same shape as a successful one. |
| 570 |
* |
| 571 |
* Recorded like any other row so "we tried and it failed" is visible in |
| 572 |
* the history rather than looking like nobody ever ran a test. |
| 573 |
* |
| 574 |
* @return array<string,mixed> |
| 575 |
*/ |
| 576 |
private static function failure( string $provider, string $url, string $strategy, string $error ): array { |
| 577 |
$row = array( |
| 578 |
'ok' => false, |
| 579 |
'provider' => $provider, |
| 580 |
'ts' => time(), |
| 581 |
'url' => $url, |
| 582 |
'strategy' => $strategy, |
| 583 |
'score' => null, |
| 584 |
'metrics' => array(), |
| 585 |
'issues' => array(), |
| 586 |
'error' => $error, |
| 587 |
); |
| 588 |
self::record( $row ); |
| 589 |
return $row; |
| 590 |
} |
| 591 |
|
| 592 |
/** |
| 593 |
* @param mixed $value Raw metric value. |
| 594 |
*/ |
| 595 |
private static function numeric( $value ): ?float { |
| 596 |
return is_numeric( $value ) ? (float) $value : null; |
| 597 |
} |
| 598 |
|
| 599 |
/** |
| 600 |
* Normalise a performance score to 0-100 from either wire shape. |
| 601 |
* |
| 602 |
* Public so a test can pin both, because which one GTmetrix sends is the |
| 603 |
* single assumption in this file we cannot verify without a live key. |
| 604 |
* |
| 605 |
* @param mixed $value Raw score, 0-1 or 0-100. |
| 606 |
*/ |
| 607 |
public static function percent( $value ): ?int { |
| 608 |
if ( ! is_numeric( $value ) ) { |
| 609 |
return null; |
| 610 |
} |
| 611 |
$number = (float) $value; |
| 612 |
$scaled = $number > 1.0 ? $number : $number * 100.0; |
| 613 |
return (int) max( 0, min( 100, round( $scaled ) ) ); |
| 614 |
} |
| 615 |
} |
| 616 |
|
