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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Common\Export\Http;
use function array_filter;
use function array_map;
use function count;
use ErrorException;
use LogicException;
use function max;
use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
use Psr\Http\Message\ResponseInterface;
use function rand;
use function restore_error_handler;
use function set_error_handler;
use function sprintf;
use function strcasecmp;
use function strtotime;
use Throwable;
use function time;
use function trim;
use UnexpectedValueException;
/**
* @internal
*/
final class PsrUtils
{
/**
* @param int $retry zero-indexed attempt number
* @param int $retryDelay initial delay in milliseconds
* @param ResponseInterface|null $response response of failed request
* @return float delay in seconds
*/
public static function retryDelay(int $retry, int $retryDelay, ?ResponseInterface $response = null): float
{
$delay = $retryDelay << $retry;
$delay = rand($delay >> 1, $delay) / 1000;
return max($delay, self::parseRetryAfter($response));
}
private static function parseRetryAfter(?ResponseInterface $response): int
{
if (!$response || !$retryAfter = $response->getHeaderLine('Retry-After')) {
return 0;
}
$retryAfter = trim($retryAfter, " \t");
if ($retryAfter === (string) (int) $retryAfter) {
return (int) $retryAfter;
}
if (($time = strtotime($retryAfter)) !== false) {
return $time - time();
}
return 0;
}
/**
* @param list<string> $encodings
* @param array<int, string>|null $appliedEncodings
*/
public static function encode(string $value, array $encodings, ?array &$appliedEncodings = null): string
{
for ($i = 0, $n = count($encodings); $i < $n; $i++) {
if (!$encoder = self::encoder($encodings[$i])) {
unset($encodings[$i]);
continue;
}
try {
$value = $encoder($value);
} catch (Throwable $e) {
unset($encodings[$i]);
}
}
$appliedEncodings = $encodings;
return $value;
}
/**
* @param list<string> $encodings
*/
public static function decode(string $value, array $encodings): string
{
for ($i = count($encodings); --$i >= 0;) {
if (strcasecmp($encodings[$i], 'identity') === 0) {
continue;
}
if (!$decoder = self::decoder($encodings[$i])) {
throw new UnexpectedValueException(sprintf('Not supported decompression encoding "%s"', $encodings[$i]));
}
$value = $decoder($value);
}
return $value;
}
/**
* Resolve an array or CSV of compression types to a list
*/
public static function compression($compression): array
{
if (is_array($compression)) {
return $compression;
}
if (!$compression) {
return [];
}
if (strpos($compression, ',') === false) {
return [$compression];
}
return array_map('trim', explode(',', $compression));
}
private static function encoder(string $encoding): ?callable
{
static $encoders;
/** @noinspection SpellCheckingInspection */
$encoders ??= array_map(fn (callable $callable): callable => self::throwOnErrorOrFalse($callable), array_filter([
TransportFactoryInterface::COMPRESSION_GZIP => 'gzencode',
TransportFactoryInterface::COMPRESSION_DEFLATE => 'gzcompress',
TransportFactoryInterface::COMPRESSION_BROTLI => 'brotli_compress',
], 'function_exists'));
return $encoders[$encoding] ?? null;
}
private static function decoder(string $encoding): ?callable
{
static $decoders;
/** @noinspection SpellCheckingInspection */
$decoders ??= array_map(fn (callable $callable): callable => self::throwOnErrorOrFalse($callable), array_filter([
TransportFactoryInterface::COMPRESSION_GZIP => 'gzdecode',
TransportFactoryInterface::COMPRESSION_DEFLATE => 'gzuncompress',
TransportFactoryInterface::COMPRESSION_BROTLI => 'brotli_uncompress',
], 'function_exists'));
return $decoders[$encoding] ?? null;
}
private static function throwOnErrorOrFalse(callable $callable): callable
{
return static function (...$args) use ($callable) {
set_error_handler(static function (int $errno, string $errstr, string $errfile, int $errline): bool {
throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
});
try {
$result = $callable(...$args);
} finally {
restore_error_handler();
}
/** @phan-suppress-next-line PhanPossiblyUndeclaredVariable */
if ($result === false) {
throw new LogicException();
}
/** @phan-suppress-next-line PhanPossiblyUndeclaredVariable */
return $result;
};
}
}
|
