ConsoleExporter.php

<?php

declare (strict_types=1);
namespace OpenTelemetry\SDK\Logs\Exporter;

use OpenTelemetry\SDK\Common\Export\TransportInterface;
use OpenTelemetry\SDK\Common\Future\CancellationInterface;
use OpenTelemetry\SDK\Common\Future\CompletedFuture;
use OpenTelemetry\SDK\Common\Future\FutureInterface;
use OpenTelemetry\SDK\Common\Instrumentation\InstrumentationScopeInterface;
use OpenTelemetry\SDK\Logs\LogRecordExporterInterface;
use OpenTelemetry\SDK\Logs\ReadableLogRecord;
use OpenTelemetry\SDK\Resource\ResourceInfo;

/**
 * A JSON console exporter for LogRecords. This is only useful for testing; the
 * output is human-readable, and is not compatible with the OTLP format.
 */
class ConsoleExporter implements LogRecordExporterInterface {
    public function __construct(TransportInterface $transport) {
    }
    
    /**
     * @param iterable<mixed, ReadableLogRecord> $batch
     */
    public function export(iterable $batch, ?CancellationInterface $cancellation = null) : FutureInterface {
        $resource = null;
        $scopes = [];
        foreach ($batch as $record) {
            if (!$resource) {
                $resource = $this->convertResource($record->getResource());
            }
            $key = $this->scopeKey($record->getInstrumentationScope());
            if (!array_key_exists($key, $scopes)) {
                $scopes[$key] = $this->convertInstrumentationScope($record->getInstrumentationScope());
            }
            $scopes[$key]['logs'][] = $this->convertLogRecord($record);
        }
        $output = [
            'resource' => $resource,
            'scopes' => array_values($scopes),
        ];
        $this->transport
            ->send(json_encode($output, JSON_PRETTY_PRINT));
        return new CompletedFuture(true);
    }
    public function forceFlush(?CancellationInterface $cancellation = null) : bool {
        return true;
    }
    public function shutdown(?CancellationInterface $cancellation = null) : bool {
        return true;
    }
    private function convertLogRecord(ReadableLogRecord $record) : array {
        $spanContext = $record->getSpanContext();
        return [
            'timestamp' => $record->getTimestamp(),
            'observed_timestamp' => $record->getObservedTimestamp(),
            'severity_number' => $record->getSeverityNumber(),
            'severity_text' => $record->getSeverityText(),
            'body' => $record->getBody(),
            'trace_id' => $spanContext !== null ? $spanContext->getTraceId() : '',
            'span_id' => $spanContext !== null ? $spanContext->getSpanId() : '',
            'trace_flags' => $spanContext !== null ? $spanContext->getTraceFlags() : null,
            'attributes' => $record->getAttributes()
                ->toArray(),
            'dropped_attributes_count' => $record->getAttributes()
                ->getDroppedAttributesCount(),
        ];
    }
    private function convertResource(ResourceInfo $resource) : array {
        return [
            'attributes' => $resource->getAttributes()
                ->toArray(),
            'dropped_attributes_count' => $resource->getAttributes()
                ->getDroppedAttributesCount(),
        ];
    }
    private function scopeKey(InstrumentationScopeInterface $scope) : string {
        return serialize([
            $scope->getName(),
            $scope->getVersion(),
            $scope->getSchemaUrl(),
            $scope->getAttributes(),
        ]);
    }
    private function convertInstrumentationScope(InstrumentationScopeInterface $scope) : array {
        return [
            'name' => $scope->getName(),
            'version' => $scope->getVersion(),
            'attributes' => $scope->getAttributes()
                ->toArray(),
            'dropped_attributes_count' => $scope->getAttributes()
                ->getDroppedAttributesCount(),
            'schema_url' => $scope->getSchemaUrl(),
            'logs' => [],
        ];
    }

}