Developer
<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Provides a read only stream that pumps data from a PHP callable.
*
* When invoking the provided callable, the PumpStream will pass the amount of
* data requested to read to the callable. The callable can choose to ignore
* this value and return fewer or more bytes than requested. Any extra data
* returned by the provided callable is buffered internally until drained using
* the read() function of the PumpStream. The provided callable MUST return
* false when there is no more data to read.
*/
final class PumpStream implements StreamInterface
{
/** @var callable(int): (string|false|null)|null */
private $source;
/** @var int|null */
private $size;
/** @var int */
private $tellPos = 0;
/** @var array */
private $metadata;
/** @var BufferStream */
private $buffer;
/**
* @param callable(int): (string|false|null) $source Source of the stream data. The callable MAY
* accept an integer argument used to control the
* amount of data to return. The callable MUST
* return a string when called, or false|null on error
* or EOF.
* @param array{size?: int, metadata?: array} $options Stream options:
* - metadata: Hash of metadata to use with stream.
* - size: Size of the stream, if known.
*/
public function __construct(callable $source, array $options = [])
{
$this->source = $source;
$this->size = $options['size'] ?? null;
$this->metadata = $options['metadata'] ?? [];
$this->buffer = new BufferStream();
}
public function __toString(): string
{
try {
return Utils::copyToString($this);
} catch (\Throwable $e) {
if (\PHP_VERSION_ID >= 70400) {
throw $e;
}
trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);
return '';
}
}
public function close(): void
{
$this->detach();
}
public function detach()
{
$this->tellPos = 0;
$this->source = null;
return null;
}
public function getSize(): ?int
{
return $this->size;
}
public function tell(): int
{
return $this->tellPos;
}
public function eof(): bool
{
return $this->source === null;
}
public function isSeekable(): bool
{
return false;
}
public function rewind(): void
{
$this->seek(0);
}
public function seek($offset, $whence = SEEK_SET): void
{
throw new \RuntimeException('Cannot seek a PumpStream');
}
public function isWritable(): bool
{
return false;
}
public function write($string): int
{
throw new \RuntimeException('Cannot write to a PumpStream');
}
public function isReadable(): bool
{
return true;
}
public function read($length): string
{
$data = $this->buffer->read($length);
$readLen = strlen($data);
$this->tellPos += $readLen;
$remaining = $length - $readLen;
if ($remaining) {
$this->pump($remaining);
$data .= $this->buffer->read($remaining);
$this->tellPos += strlen($data) - $readLen;
}
return $data;
}
public function getContents(): string
{
$result = '';
while (!$this->eof()) {
$result .= $this->read(1000000);
}
return $result;
}
/**
* @return mixed
*/
public function getMetadata($key = null)
{
if (!$key) {
return $this->metadata;
}
return $this->metadata[$key] ?? null;
}
private function pump(int $length): void
{
if ($this->source !== null) {
do {
$data = ($this->source)($length);
if ($data === false || $data === null) {
$this->source = null;
return;
}
$this->buffer->write($data);
$length -= strlen($data);
} while ($length > 0);
}
}
}
Developer
To access the Kueue Pay Developer API, you’ll need an API key. You can obtain your API key by logging in to your Kueue Pay merchant account and navigating to the API section. Collect Client ID , Secret ID & Merchant ID Carefully. Keep your API key confidential and do not share it publicly.