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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Trace;
use OpenTelemetry\API\Trace\SpanContextValidator;
use Throwable;
class RandomIdGenerator implements IdGeneratorInterface
{
private const TRACE_ID_HEX_LENGTH = 32;
private const SPAN_ID_HEX_LENGTH = 16;
public function generateTraceId(): string
{
do {
$traceId = $this->randomHex(self::TRACE_ID_HEX_LENGTH);
} while (!SpanContextValidator::isValidTraceId($traceId));
return $traceId;
}
public function generateSpanId(): string
{
do {
$spanId = $this->randomHex(self::SPAN_ID_HEX_LENGTH);
} while (!SpanContextValidator::isValidSpanId($spanId));
return $spanId;
}
/**
* @psalm-suppress ArgumentTypeCoercion $hexLength is always a positive integer
*/
private function randomHex(int $hexLength): string
{
try {
return bin2hex(random_bytes(intdiv($hexLength, 2)));
} catch (Throwable $e) {
return $this->fallbackAlgorithm($hexLength);
}
}
private function fallbackAlgorithm(int $hexLength): string
{
return substr(str_shuffle(str_repeat('0123456789abcdef', $hexLength)), 1, $hexLength);
}
}
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