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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * @file |
| 5 | * @ingroup Extensions |
| 6 | * @copyright 2020– Abstract Wikipedia team; see AUTHORS.txt |
| 7 | * @license MIT |
| 8 | */ |
| 9 | |
| 10 | namespace MediaWiki\Extension\WikiLambda\Jobs; |
| 11 | |
| 12 | use Exception; |
| 13 | use MediaWiki\Config\Config; |
| 14 | use MediaWiki\Extension\WikiLambda\Cache\MemcachedWrapper; |
| 15 | use MediaWiki\Extension\WikiLambda\HttpStatus; |
| 16 | use MediaWiki\Extension\WikiLambda\Registry\ZErrorTypeRegistry; |
| 17 | use MediaWiki\Extension\WikiLambda\Registry\ZTypeRegistry; |
| 18 | use MediaWiki\Extension\WikiLambda\WikifunctionCallException; |
| 19 | use MediaWiki\Extension\WikiLambda\WikiLambdaServices; |
| 20 | use MediaWiki\Extension\WikiLambda\ZObjectUtils; |
| 21 | use MediaWiki\Http\HttpRequestFactory; |
| 22 | use MediaWiki\JobQueue\GenericParameterJob; |
| 23 | use MediaWiki\JobQueue\Job; |
| 24 | use MediaWiki\Logger\LoggerFactory; |
| 25 | use MediaWiki\MediaWikiServices; |
| 26 | use MWHttpRequest; |
| 27 | use Psr\Log\LoggerInterface; |
| 28 | |
| 29 | /** |
| 30 | * Asynchronous job run on the client wiki to request a function call from the repo, turning |
| 31 | * that into a fragment rendering for the page. |
| 32 | */ |
| 33 | class WikifunctionsClientRequestJob extends Job implements GenericParameterJob { |
| 34 | |
| 35 | private Config $config; |
| 36 | private HttpRequestFactory $httpRequestFactory; |
| 37 | private MemcachedWrapper $objectCache; |
| 38 | private LoggerInterface $logger; |
| 39 | |
| 40 | private string $targetFunction; |
| 41 | private array $functionArguments; |
| 42 | private string $parseLang; |
| 43 | private string $renderLang; |
| 44 | private string $clientCacheKey; |
| 45 | |
| 46 | /** |
| 47 | * @inheritDoc |
| 48 | */ |
| 49 | public function __construct( array $params ) { |
| 50 | // This job, triggered by the Parsoid callback for rendering a function, |
| 51 | // tries to make a network request for the content. |
| 52 | |
| 53 | parent::__construct( 'wikifunctionsClientRequest', $params ); |
| 54 | |
| 55 | $this->logger = LoggerFactory::getInstance( 'WikiLambdaClient' ); |
| 56 | $this->objectCache = WikiLambdaServices::getMemcachedWrapper(); |
| 57 | $this->config = MediaWikiServices::getInstance()->getConfigFactory()->makeConfig( 'WikiLambda' ); |
| 58 | $this->httpRequestFactory = MediaWikiServices::getInstance()->getHttpRequestFactory(); |
| 59 | |
| 60 | // These are the user input from the wikitext, as relayed from Parsoid |
| 61 | $this->targetFunction = $params['request']['target'] ?? ''; |
| 62 | $this->functionArguments = $params['request']['arguments'] ?? []; |
| 63 | $this->parseLang = $params['request']['parseLang'] ?? ''; |
| 64 | $this->renderLang = $params['request']['renderLang'] ?? ''; |
| 65 | |
| 66 | // This comes from our fragment handler |
| 67 | $this->clientCacheKey = $params['clientCacheKey']; |
| 68 | |
| 69 | $this->logger->debug( |
| 70 | __CLASS__ . ' created for {target} with {params}; to store as key {key}', |
| 71 | [ |
| 72 | 'target' => $this->targetFunction, |
| 73 | 'params' => var_export( $this->functionArguments, true ), |
| 74 | 'key' => $this->clientCacheKey |
| 75 | ] |
| 76 | ); |
| 77 | } |
| 78 | |
| 79 | /** @inheritDoc */ |
| 80 | public function ignoreDuplicates() { |
| 81 | // We've carefully chosen the parameters so this Job is shared across multiple uses, so don't run it |
| 82 | // in parallel and have MediaWiki de-duplicate requests. |
| 83 | return true; |
| 84 | } |
| 85 | |
| 86 | /** @inheritDoc */ |
| 87 | public function getDeduplicationInfo() { |
| 88 | return [ |
| 89 | 'type' => 'wikifunctionsClientRequest', |
| 90 | 'clientCacheKey' => $this->clientCacheKey, |
| 91 | ]; |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * @return bool |
| 96 | */ |
| 97 | public function run() { |
| 98 | $this->logger->debug( __CLASS__ . ' initiated for {target}', [ 'target' => $this->targetFunction ] ); |
| 99 | |
| 100 | try { |
| 101 | $output = $this->remoteCall( |
| 102 | $this->targetFunction, $this->functionArguments, $this->parseLang, $this->renderLang |
| 103 | ); |
| 104 | // We don't actually use the return value immediately, we rely on Parsoid to re-trigger the request |
| 105 | // and so use the cached value, so we just set() it. |
| 106 | $this->objectCache->set( |
| 107 | $this->clientCacheKey, |
| 108 | [ |
| 109 | 'success' => true, |
| 110 | 'value' => $output['value'], |
| 111 | 'type' => $output['type'], |
| 112 | ], |
| 113 | // (T338243) Set all successful responses with TTL_MONTH |
| 114 | $this->objectCache::TTL_MONTH |
| 115 | ); |
| 116 | |
| 117 | $this->logger->debug( __CLASS__ . ' success for {target}', [ 'target' => $this->targetFunction ] ); |
| 118 | return true; |
| 119 | } catch ( WikifunctionCallException $callException ) { |
| 120 | // WikifunctionCallException: we know details of the error |
| 121 | $errorMessageKey = $callException->getMessageKey(); |
| 122 | $httpStatusCode = $callException->getHttpStatusCode(); |
| 123 | } catch ( Exception $e ) { |
| 124 | // Unhandled exception: we have no details on how the error happened |
| 125 | $this->logger->error( |
| 126 | __CLASS__ . '::remoteCall threw an unhandled Exception: {error}', |
| 127 | [ |
| 128 | 'error' => $e->getMessage(), |
| 129 | 'exception' => $e |
| 130 | ] |
| 131 | ); |
| 132 | // Show unclear error or system failure |
| 133 | $errorMessageKey = 'wikilambda-functioncall-error-unclear'; |
| 134 | $httpStatusCode = HttpStatus::INTERNAL_SERVER_ERROR; |
| 135 | } |
| 136 | |
| 137 | // (T338243) Set TTL conditionally, so that: |
| 138 | // * success (http 200) TTL_MONTH |
| 139 | // * bad request (http 400-422) TTL_WEEK |
| 140 | // * too many requests (http 429) TTL_MINUTE |
| 141 | // * server error (http >= 500) TTL_MINUTE |
| 142 | // So if the request fails due to 400, we can still cache for |
| 143 | // a week, but if it failes due to system outages or timeouts, |
| 144 | // we would benefit from reducing the TTL to something very short. |
| 145 | $errorTTL = ( |
| 146 | ( $httpStatusCode >= HttpStatus::INTERNAL_SERVER_ERROR ) || |
| 147 | ( $httpStatusCode === HttpStatus::TOO_MANY_REQUESTS ) ) ? |
| 148 | $this->objectCache::TTL_MINUTE : |
| 149 | $this->objectCache::TTL_WEEK; |
| 150 | |
| 151 | $this->objectCache->set( |
| 152 | $this->clientCacheKey, |
| 153 | [ |
| 154 | 'success' => false, |
| 155 | 'errorMessageKey' => $errorMessageKey, |
| 156 | ], |
| 157 | $errorTTL |
| 158 | ); |
| 159 | |
| 160 | $this->logger->debug( |
| 161 | __CLASS__ . ' failure for {target}, error: {errorMessageKey}', |
| 162 | [ |
| 163 | 'target' => $this->targetFunction, |
| 164 | 'errorMessageKey' => $errorMessageKey |
| 165 | ] |
| 166 | ); |
| 167 | |
| 168 | // Our call has been triggered and has run, so return true so that our job isn't re-tried. |
| 169 | return true; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * @param string $target The ZID of the function to call |
| 174 | * @param string[] $arguments The function call parameters |
| 175 | * @param string $parseLanguageCode The language code in which to parse inputs, e.g. 'de' |
| 176 | * @param string $renderLanguageCode The language code in which to render outputs, e.g. 'fr' |
| 177 | * |
| 178 | * @throws WikifunctionCallException A known error happened |
| 179 | * @throws Exception An unknown error happened |
| 180 | */ |
| 181 | private function remoteCall( |
| 182 | string $target, |
| 183 | array $arguments, |
| 184 | string $parseLanguageCode, |
| 185 | string $renderLanguageCode |
| 186 | ): array { |
| 187 | if ( count( $arguments ) === 0 ) { |
| 188 | // We structurally cannot support calls without arguments (the REST API errors about the arguments key being |
| 189 | // unset); instead of spending resources and worrying the developers, throw specifically |
| 190 | |
| 191 | // Triggers use of messages: |
| 192 | // * wikilambda-functioncall-error-bad-inputs-category |
| 193 | // * wikilambda-functioncall-error-bad-inputs-category-desc |
| 194 | throw new WikifunctionCallException( |
| 195 | 'wikilambda-functioncall-error-bad-inputs', |
| 196 | HttpStatus::BAD_REQUEST |
| 197 | ); |
| 198 | } |
| 199 | |
| 200 | $request = $this->buildRequest( $target, $arguments, $parseLanguageCode, $renderLanguageCode ); |
| 201 | |
| 202 | $responseStatus = $request->execute(); |
| 203 | $httpStatusCode = $request->getStatus(); |
| 204 | |
| 205 | // Http 0: Request didn't fly |
| 206 | if ( $httpStatusCode === 0 ) { |
| 207 | // Triggers use of messages: |
| 208 | // * wikilambda-functioncall-error-unclear-category |
| 209 | // * wikilambda-functioncall-error-unclear-category-desc |
| 210 | throw new WikifunctionCallException( |
| 211 | 'wikilambda-functioncall-error-unclear', |
| 212 | HttpStatus::INTERNAL_SERVER_ERROR |
| 213 | ); |
| 214 | } |
| 215 | |
| 216 | // Http 200: Response successful |
| 217 | $response = json_decode( $request->getContent() ); |
| 218 | |
| 219 | if ( $response && $responseStatus->isOK() ) { |
| 220 | return [ |
| 221 | 'value' => $response->value, |
| 222 | 'type' => $response->type, |
| 223 | ]; |
| 224 | } |
| 225 | |
| 226 | // If not OK, process error responses: |
| 227 | // If errorKey is 'wikilambda-zerror', extract ZError and ZError code |
| 228 | $zerrorCode = null; |
| 229 | $zerror = null; |
| 230 | if ( $response && property_exists( $response, 'errorKey' ) && $response->errorKey === 'wikilambda-zerror' ) { |
| 231 | $zerrorCode = $response->errorData->zerror->{ ZTypeRegistry::Z_ERROR_TYPE } ?: null; |
| 232 | $zerror = $response->errorData->zerror ?: null; |
| 233 | } else { |
| 234 | $this->logger->warning( |
| 235 | __METHOD__ . ' encountered an error response {httpStatusCode} with a broken ZError: {response}', |
| 236 | [ |
| 237 | 'httpStatusCode' => $httpStatusCode, |
| 238 | 'response' => $request->getContent() |
| 239 | ] |
| 240 | ); |
| 241 | // Triggers use of messages: |
| 242 | // * wikilambda-functioncall-error-unclear-category |
| 243 | // * wikilambda-functioncall-error-unclear-category-desc |
| 244 | throw new WikifunctionCallException( |
| 245 | 'wikilambda-functioncall-error-unclear', |
| 246 | HttpStatus::INTERNAL_SERVER_ERROR |
| 247 | ); |
| 248 | } |
| 249 | |
| 250 | $this->logger->debug( |
| 251 | __METHOD__ . ' encountered an error response {httpStatusCode}: {zerrorCode}', |
| 252 | [ |
| 253 | 'httpStatusCode' => $httpStatusCode, |
| 254 | 'zerrorCode' => $zerrorCode |
| 255 | ] |
| 256 | ); |
| 257 | |
| 258 | switch ( $httpStatusCode ) { |
| 259 | // HTTP 400: Bad Request |
| 260 | // Something is wrong with the content (e.g. in the user request or the on-wiki content on WF.org) |
| 261 | case HttpStatus::BAD_REQUEST: |
| 262 | case HttpStatus::NOT_FOUND: |
| 263 | switch ( $zerrorCode ) { |
| 264 | case ZErrorTypeRegistry::Z_ERROR_ZID_NOT_FOUND: |
| 265 | // Error cases: |
| 266 | // * Function not found |
| 267 | // * Input reference not found |
| 268 | // Triggers use of messages: |
| 269 | // * wikilambda-functioncall-error-unknown-zid-category |
| 270 | // * wikilambda-functioncall-error-unknown-zid-category-desc |
| 271 | throw new WikifunctionCallException( |
| 272 | 'wikilambda-functioncall-error-unknown-zid', |
| 273 | $httpStatusCode, |
| 274 | $zerror |
| 275 | ); |
| 276 | |
| 277 | case ZErrorTypeRegistry::Z_ERROR_NOT_WELLFORMED: |
| 278 | // Error cases: |
| 279 | // * Function object found but not valid |
| 280 | // Triggers use of messages: |
| 281 | // * wikilambda-functioncall-error-invalid-zobject-category |
| 282 | // * wikilambda-functioncall-error-invalid-zobject-category-desc |
| 283 | throw new WikifunctionCallException( |
| 284 | 'wikilambda-functioncall-error-invalid-zobject', |
| 285 | $httpStatusCode, |
| 286 | $zerror |
| 287 | ); |
| 288 | |
| 289 | case ZErrorTypeRegistry::Z_ERROR_ARGUMENT_TYPE_MISMATCH: |
| 290 | switch ( $response->mode ) { |
| 291 | case 'function': |
| 292 | // Error cases: |
| 293 | // * Function Zid belongs to an object of a different type |
| 294 | // Triggers use of messages: |
| 295 | // * wikilambda-functioncall-error-nonfunction-category |
| 296 | // * wikilambda-functioncall-error-nonfunction-category-desc |
| 297 | throw new WikifunctionCallException( |
| 298 | 'wikilambda-functioncall-error-nonfunction', |
| 299 | $httpStatusCode, |
| 300 | $zerror |
| 301 | ); |
| 302 | |
| 303 | case 'input': |
| 304 | // Error cases: |
| 305 | // * Input reference belongs to an object of an unexpected type |
| 306 | // Triggers use of messages: |
| 307 | // * wikilambda-functioncall-error-bad-input-type-category |
| 308 | // * wikilambda-functioncall-error-bad-input-type-category-desc |
| 309 | throw new WikifunctionCallException( |
| 310 | 'wikilambda-functioncall-error-bad-input-type', |
| 311 | $httpStatusCode, |
| 312 | $zerror |
| 313 | ); |
| 314 | |
| 315 | default: |
| 316 | break; |
| 317 | } |
| 318 | // Fall-back to default handling, below. |
| 319 | break; |
| 320 | |
| 321 | case ZErrorTypeRegistry::Z_ERROR_LANG_NOT_FOUND: |
| 322 | // Error cases: |
| 323 | // * parser lang code not found |
| 324 | // * renderer lang code not found |
| 325 | // Triggers use of messages: |
| 326 | // * wikilambda-functioncall-error-bad-langs-category |
| 327 | // * wikilambda-functioncall-error-bad-langs-category-desc |
| 328 | throw new WikifunctionCallException( |
| 329 | 'wikilambda-functioncall-error-bad-langs', |
| 330 | $httpStatusCode, |
| 331 | $zerror |
| 332 | ); |
| 333 | |
| 334 | case ZErrorTypeRegistry::Z_ERROR_ARGUMENT_COUNT_MISMATCH: |
| 335 | // Error cases: |
| 336 | // * wrong number of arguments |
| 337 | // Triggers use of messages: |
| 338 | // * wikilambda-functioncall-error-bad-inputs-category |
| 339 | // * wikilambda-functioncall-error-bad-inputs-category-desc |
| 340 | throw new WikifunctionCallException( |
| 341 | 'wikilambda-functioncall-error-bad-inputs', |
| 342 | $httpStatusCode, |
| 343 | $zerror |
| 344 | ); |
| 345 | |
| 346 | case ZErrorTypeRegistry::Z_ERROR_NOT_IMPLEMENTED_YET: |
| 347 | switch ( $response->mode ) { |
| 348 | case 'input': |
| 349 | // Error cases: |
| 350 | // * input type is generic |
| 351 | // * input type has no parser |
| 352 | // Triggers use of messages: |
| 353 | // * wikilambda-functioncall-error-nonstringinput-category |
| 354 | // * wikilambda-functioncall-error-nonstringinput-category-desc |
| 355 | throw new WikifunctionCallException( |
| 356 | 'wikilambda-functioncall-error-nonstringinput', |
| 357 | $httpStatusCode, |
| 358 | $zerror |
| 359 | ); |
| 360 | |
| 361 | case 'output': |
| 362 | // Error cases: |
| 363 | // * output type is generic |
| 364 | // * output type has no renderer |
| 365 | // Triggers use of messages: |
| 366 | // * wikilambda-functioncall-error-nonstringoutput-category |
| 367 | // * wikilambda-functioncall-error-nonstringoutput-category-desc |
| 368 | throw new WikifunctionCallException( |
| 369 | 'wikilambda-functioncall-error-nonstringoutput', |
| 370 | $httpStatusCode, |
| 371 | $zerror |
| 372 | ); |
| 373 | |
| 374 | default: |
| 375 | break; |
| 376 | } |
| 377 | // Fall-back to default handling, below. |
| 378 | break; |
| 379 | |
| 380 | case ZErrorTypeRegistry::Z_ERROR_API_FAILURE: |
| 381 | // Error cases: |
| 382 | // * some error happened trying to make the request to the orchestrator |
| 383 | // Triggers use of messages: |
| 384 | // * wikilambda-functioncall-error-unclear-category |
| 385 | // * wikilambda-functioncall-error-unclear-category-desc |
| 386 | throw new WikifunctionCallException( |
| 387 | 'wikilambda-functioncall-error-unclear', |
| 388 | $httpStatusCode, |
| 389 | $zerror |
| 390 | ); |
| 391 | |
| 392 | case ZErrorTypeRegistry::Z_ERROR_EVALUATION: |
| 393 | // Error cases: |
| 394 | // * some error happened in the orchestrator |
| 395 | // Triggers use of messages: |
| 396 | // * wikilambda-functioncall-error-evaluation-category |
| 397 | // * wikilambda-functioncall-error-evaluation-category-desc |
| 398 | throw new WikifunctionCallException( |
| 399 | 'wikilambda-functioncall-error-evaluation', |
| 400 | $httpStatusCode, |
| 401 | $zerror |
| 402 | ); |
| 403 | |
| 404 | case ZErrorTypeRegistry::Z_ERROR_INVALID_EVALUATION_RESULT: |
| 405 | // Error cases: |
| 406 | // * orchestrator returned a non-error output but of wrong type |
| 407 | // Triggers use of messages: |
| 408 | // * wikilambda-functioncall-error-bad-output-category |
| 409 | // * wikilambda-functioncall-error-bad-output-category-desc |
| 410 | throw new WikifunctionCallException( |
| 411 | 'wikilambda-functioncall-error-bad-output', |
| 412 | $httpStatusCode, |
| 413 | $zerror |
| 414 | ); |
| 415 | |
| 416 | default: |
| 417 | // Non zerror, or Unknown zerror: |
| 418 | $this->logger->error( |
| 419 | __METHOD__ . ' encountered a {httpStatusCode} HTTP error with an unknown zerror', |
| 420 | [ |
| 421 | 'zerror' => $zerror, |
| 422 | 'zerrorCode' => $zerrorCode, |
| 423 | 'httpStatusCode' => $httpStatusCode, |
| 424 | 'response' => $request->getContent() |
| 425 | ] |
| 426 | ); |
| 427 | } |
| 428 | // Fall-back to default handling, below. |
| 429 | break; |
| 430 | |
| 431 | // HTTP 500: Internal Server Error |
| 432 | // Something went wrong in the server's code (not user-written code or user error) |
| 433 | case HttpStatus::INTERNAL_SERVER_ERROR: |
| 434 | case HttpStatus::NOT_IMPLEMENTED: |
| 435 | switch ( $zerrorCode ) { |
| 436 | case ZErrorTypeRegistry::Z_ERROR_NOT_IMPLEMENTED_YET: |
| 437 | // Error cases: |
| 438 | // * Wikifunctions Repo service is disabled |
| 439 | // Triggers use of messages: |
| 440 | // * wikilambda-functioncall-error-disabled-category |
| 441 | // * wikilambda-functioncall-error-disabled-category-desc |
| 442 | throw new WikifunctionCallException( |
| 443 | 'wikilambda-functioncall-error-disabled', |
| 444 | $httpStatusCode, |
| 445 | $zerror |
| 446 | ); |
| 447 | |
| 448 | default: |
| 449 | $this->logger->error( |
| 450 | __METHOD__ . ' encountered a {httpStatusCode} HTTP error with an unknown zerror', |
| 451 | [ |
| 452 | 'zerror' => $zerror, |
| 453 | 'zerrorCode' => $zerrorCode, |
| 454 | 'httpStatusCode' => $httpStatusCode, |
| 455 | 'response' => $request->getContent() |
| 456 | ] |
| 457 | ); |
| 458 | // Fall-back to default handling, below. |
| 459 | break; |
| 460 | } |
| 461 | break; |
| 462 | |
| 463 | default: |
| 464 | $this->logger->warning( |
| 465 | __METHOD__ . ' encountered an unknown HTTP error code', |
| 466 | [ |
| 467 | 'zerror' => $zerror, |
| 468 | 'zerrorCode' => $zerrorCode, |
| 469 | 'httpStatusCode' => $httpStatusCode, |
| 470 | 'response' => $request->getContent() |
| 471 | ] |
| 472 | ); |
| 473 | // Fall-back to default handling, below. |
| 474 | break; |
| 475 | } |
| 476 | |
| 477 | // Default handling: |
| 478 | // Triggers use of messages: |
| 479 | // * wikilambda-functioncall-error-category |
| 480 | // * wikilambda-functioncall-error-category-desc |
| 481 | throw new WikifunctionCallException( |
| 482 | 'wikilambda-functioncall-error', |
| 483 | $httpStatusCode, |
| 484 | $zerror |
| 485 | ); |
| 486 | } |
| 487 | |
| 488 | /** |
| 489 | * Returns the HTTP request to the function call REST API with the given wikifunctions call parameters. |
| 490 | * |
| 491 | * @param string $target |
| 492 | * @param array $args |
| 493 | * @param string $parseLang |
| 494 | * @param string $renderLang |
| 495 | * @return MWHttpRequest |
| 496 | */ |
| 497 | private function buildRequest( string $target, array $args, string $parseLang, string $renderLang ): MWHttpRequest { |
| 498 | // This is a slightly hacky way to ensure that user inputs are transmit-safe, and that e.g. |
| 499 | // inputs with '|'s in them can be ferried across the network without |
| 500 | $encodedArguments = implode( |
| 501 | '|', |
| 502 | array_map( static fn ( $val ): string => ZObjectUtils::encodeStringParamForNetwork( $val ), $args ) |
| 503 | ); |
| 504 | |
| 505 | $requestUri = self::getClientTargetUrl( $this->config, $this->logger ) |
| 506 | . $this->config->get( 'RestPath' ) |
| 507 | . '/wikifunctions/v0/call' |
| 508 | . '/' . $target |
| 509 | . '/' . $encodedArguments |
| 510 | . '/' . $parseLang |
| 511 | . '/' . $renderLang; |
| 512 | |
| 513 | // HttpRequestFactory->create() returns GuzzleHttpRequest (extends MWHttpRequest): |
| 514 | // https://doc.wikimedia.org/mediawiki-core/master/php/classGuzzleHttpRequest.html |
| 515 | // https://doc.wikimedia.org/mediawiki-core/master/php/classMWHttpRequest.html |
| 516 | $request = $this->httpRequestFactory->create( $requestUri, [ 'method' => 'GET' ], __METHOD__ ); |
| 517 | |
| 518 | return $request; |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * Returns the Url of the Wikilambda server instance, |
| 523 | * and if not available in the configuration variables, |
| 524 | * returns an empty string and logs an error. |
| 525 | * |
| 526 | * @param Config $config |
| 527 | * @param LoggerInterface $logger |
| 528 | * @return string |
| 529 | */ |
| 530 | public static function getClientTargetUrl( $config, $logger ): string { |
| 531 | $targetUrl = $config->get( 'WikiLambdaClientTargetAPI' ); |
| 532 | if ( !$targetUrl ) { |
| 533 | $logger->error( __METHOD__ . ': missing configuration variable WikiLambdaClientTargetAPI' ); |
| 534 | } |
| 535 | return $targetUrl ?? ''; |
| 536 | } |
| 537 | } |