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<?php |
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/** |
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* This file is part of GitterApi package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Gitter\Support; |
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use Psr\Http\Message\StreamInterface; |
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use Psr\Log\LoggerInterface; |
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/** |
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* Class JsonStream |
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* @package Gitter\Support |
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*/ |
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class JsonStream |
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{ |
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/** |
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* @var string[] |
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*/ |
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const JSON_STARTS_WITH = ['{', '[']; |
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/** |
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* @var int |
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*/ |
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const BUFFER_MAX_SIZE = 2 ** 14; |
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/** |
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* @var string |
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*/ |
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private $bufferSize; |
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/** |
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* @var string |
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*/ |
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private $endsWith = ']'; |
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/** |
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* @var string |
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*/ |
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private $buffer = ''; |
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/** |
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* @var int |
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*/ |
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private $chunkSize = 1; |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* JsonStream constructor. |
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* @param int $bufferSize |
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*/ |
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public function __construct(int $bufferSize = self::BUFFER_MAX_SIZE) |
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{ |
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$this->bufferSize = $bufferSize; |
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} |
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/** |
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* @param LoggerInterface $logger |
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*/ |
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public function setLogger(LoggerInterface $logger) |
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{ |
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$this->logger = $logger; |
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} |
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/** |
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* @throws \OutOfBoundsException |
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*/ |
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private function checkSize() |
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{ |
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if ($this->bufferSize > 0 && \strlen($this->buffer) > $this->bufferSize) { |
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throw new \OutOfBoundsException( |
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sprintf('Memory leak detected. Buffer size out of %s bytes', $this->bufferSize) |
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); |
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} |
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} |
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/** |
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* @param string $data |
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* @return bool |
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*/ |
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private function shouldStarts(string $data): bool |
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{ |
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return $this->buffer === '' && \in_array($data[0], self::JSON_STARTS_WITH, true);; |
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} |
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/** |
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* @param string $data |
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* @param \Closure|null $callback |
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* @return mixed|null |
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*/ |
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public function push(string $data, \Closure $callback = null) |
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{ |
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// Buffer are empty and input starts with "[" or "{" |
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$canBeBuffered = $this->shouldStarts($data); |
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// Data can be starts buffering |
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if ($canBeBuffered) { |
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$this->endsWith = $data[0] === '[' ? ']' : '}'; |
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} |
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// Add chunks for non empty buffer |
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if ($canBeBuffered || $this->buffer !== '') { |
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$this->buffer .= $data; |
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if ($this->isEnds($data)) { |
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$object = \json_decode($this->buffer, true); |
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if (\json_last_error() === JSON_ERROR_NONE) { |
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$this->buffer = ''; |
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if ($callback !== null) { |
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$callback($object); |
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} |
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return $object; |
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} |
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} |
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} |
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return null; |
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} |
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/** |
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* @param string $text |
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* @return bool |
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*/ |
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private function isEnds(string $text): bool |
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{ |
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$text = \trim($text); |
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return $text && $text[\strlen($text) - 1] === $this->endsWith; |
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} |
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/** |
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* @param StreamInterface $stream |
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* @return \Generator |
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* @throws \OutOfBoundsException |
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* @throws \RuntimeException |
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*/ |
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public function stream(StreamInterface $stream): \Generator |
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{ |
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while (!$stream->eof()) { |
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$data = $stream->read($this->chunkSize); |
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$output = $this->push($data); |
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if ($output !== null) { |
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yield $output; |
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} |
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$this->checkSize(); |
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} |
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} |
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} |
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SerafimArts /
gitter-api
