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<?php |
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/* |
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* This file is part of the Koded package. |
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* |
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* (c) Mihail Binev <[email protected]> |
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* |
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* Please view the LICENSE distributed with this source code |
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* for the full copyright and license information. |
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* |
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*/ |
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namespace Koded\Http; |
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use Exception; |
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use Generator; |
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use Psr\Http\Message\StreamInterface; |
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use ReflectionFunction; |
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use RuntimeException; |
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class CallableStream implements StreamInterface |
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{ |
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/** @var callable */ |
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private $callable; |
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/** @var int Current position of the pointer in the buffer */ |
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private $position = 0; |
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/** @var bool If callable is Generator instance */ |
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private $isGenerator = false; |
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public function __construct(callable $callable) |
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{ |
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$this->callable = $callable; |
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$this->isGenerator = (new ReflectionFunction($this->callable))->isGenerator(); |
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} |
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public function __destruct() |
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{ |
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$this->close(); |
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} |
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public function __toString(): string |
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{ |
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try { |
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return $this->getContents(); |
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} catch (RuntimeException $e) { |
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return ''; |
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} |
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} |
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public function close(): void |
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{ |
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$this->detach(); |
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} |
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public function detach() |
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{ |
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$this->callable = null; |
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$this->position = 0; |
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} |
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public function getSize(): ?int |
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{ |
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return null; |
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} |
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public function tell(): int |
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{ |
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return $this->position; |
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} |
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public function eof(): bool |
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{ |
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return null === $this->callable; |
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} |
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public function seek($offset, $whence = SEEK_SET): void |
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{ |
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throw new RuntimeException('Cannot seek in CallableStream'); |
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} |
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public function rewind(): void |
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{ |
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throw new RuntimeException('Cannot rewind the CallableStream'); |
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} |
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public function write($string): int |
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{ |
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throw new RuntimeException('Cannot write to CallableStream'); |
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} |
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public function read($length): string |
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{ |
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$content = ''; |
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if (null === $this->callable) { |
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return $content; |
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} |
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try { |
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foreach ($this->reader($length) as $chunk) { |
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$content .= $chunk; |
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$this->position += mb_strlen($chunk); |
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} |
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} catch (Exception $e) { |
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throw new RuntimeException($e->getMessage(), $e->getCode(), $e); |
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} finally { |
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$this->callable = null; |
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} |
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return $content; |
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} |
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public function getContents(): string |
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{ |
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return $this->read(65536); // 64KB |
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} |
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public function getMetadata($key = null) |
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{ |
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return $key ? null : []; |
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} |
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public function isSeekable(): bool |
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{ |
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return false; |
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} |
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public function isWritable(): bool |
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{ |
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return false; |
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} |
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public function isReadable(): bool |
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{ |
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return true; |
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} |
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/** |
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* @param int $length |
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* |
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* @return Generator |
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* @throws RuntimeException |
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*/ |
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private function reader(int $length): Generator |
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{ |
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if ($this->isGenerator) { |
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yield from ($this->callable)(); |
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} elseif ($resource = fopen('php://temp', 'r+')) { |
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if (false === @fwrite($resource, ($this->callable)())) { |
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throw new RuntimeException('Cannot write to stream'); |
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} |
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fseek($resource, 0); |
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while (false === feof($resource)) { |
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yield fread($resource, $length); |
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} |
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fclose($resource); |
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} |
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} |
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} |
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kodedphp /
http
