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<?php /** * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ namespace MediaWiki\Http; use Wikimedia\Http\TelemetryHeadersInterface; /** * Service for handling telemetry data * @unstable * @since 1.41 */ class Telemetry implements TelemetryHeadersInterface { /** * @var Telemetry|null */ private static ?Telemetry $instance = null; /** * * @var string|null Request id */ private ?string $reqId = null; /** * Server and execution environment information. * * @see https://www.php.net/manual/en/reserved.variables.server.php * @var array */ private array $server; private ?bool $allowExternalReqID; /** * @param array $server Server and execution environment information, most likely the $_SERVER variable */ public function __construct( array $server, ?bool $allowExternalReqID = null ) { $this->server = $server; $this->allowExternalReqID = $allowExternalReqID; } public static function getInstance(): Telemetry { if ( !isset( self::$instance ) ) { global $wgAllowExternalReqID; self::$instance = new self( $_SERVER, $wgAllowExternalReqID ); } return self::$instance; } /** * Get the current request ID. * * This is usually based on the `X-Request-Id` header, or the `UNIQUE_ID` * environment variable, falling back to (process cached) randomly-generated string. * * @return string */ public function getRequestId(): string { // This method is called from various error handlers and MUST be kept simple and stateless. if ( !isset( $this->reqId ) ) { if ( $this->allowExternalReqID ) { $id = ( $this->server['HTTP_X_REQUEST_ID'] ?? $this->server['UNIQUE_ID'] ?? wfRandomString( 24 ) ); } else { $id = ( $this->server['UNIQUE_ID'] ?? wfRandomString( 24 ) ); } $this->reqId = $id; } return $this->reqId; } /** * Override the unique request ID. This is for sub-requests, such as jobs, * that wish to use the same id but are not part of the same execution context. * * @param string $newId */ public function overrideRequestId( string $newId ): void { $this->reqId = $newId; } /** * Regenerate the request id by setting it to null, next call to `getRequestId` * will refetch the request id from header/UNIQUE_ID or regenerate it. * @return void */ public function regenerateRequestId() { $this->reqId = null; } /** * Get the OpenTelemetry tracestate info * Returns null when not present or AllowExternalReqID is set to false * * @return string|null */ public function getTracestate(): ?string { return $this->allowExternalReqID ? $this->server['HTTP_TRACESTATE'] ?? null : null; } /** * Get the OpenTelemetry traceparent info, * Returns null when not present or AllowExternalReqID is set to false * * @return string|null */ public function getTraceparent(): ?string { return $this->allowExternalReqID ? $this->server['HTTP_TRACEPARENT'] ?? null : null; } /** * Return Telemetry data in form of request headers * @return array */ public function getRequestHeaders(): array { return array_filter( [ 'tracestate' => $this->getTracestate(), 'traceparent' => $this->getTraceparent(), 'X-Request-Id' => $this->getRequestId() ] ); } }
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