Subversion Repositories php-qbpwcf

<?php

namespace React\Stream;

use Evenement\EventEmitter;

use React\EventLoop\LoopInterface;

use InvalidArgumentException;

final class ReadableResourceStream extends EventEmitter implements ReadableStreamInterface

{

    /**

     * @var resource

     */

    private $stream;

    private $loop;

    /**

     * Controls the maximum buffer size in bytes to read at once from the stream.

     *

     * This value SHOULD NOT be changed unless you know what you're doing.

     *

     * This can be a positive number which means that up to X bytes will be read

     * at once from the underlying stream resource. Note that the actual number

     * of bytes read may be lower if the stream resource has less than X bytes

     * currently available.

     *

     * This can be `-1` which means read everything available from the

     * underlying stream resource.

     * This should read until the stream resource is not readable anymore

     * (i.e. underlying buffer drained), note that this does not neccessarily

     * mean it reached EOF.

     *

     * @var int

     */

    private $bufferSize;

    private $closed = false;

    private $listening = false;

    public function __construct($stream, LoopInterface $loop, $readChunkSize = null)

    {

        if (!\is_resource($stream) || \get_resource_type($stream) !== "stream") {

             throw new InvalidArgumentException('First parameter must be a valid stream resource');

        }

        // ensure resource is opened for reading (fopen mode must contain "r" or "+")

        $meta = \stream_get_meta_data($stream);

        if (isset($meta['mode']) && $meta['mode'] !== '' && \strpos($meta['mode'], 'r') === \strpos($meta['mode'], '+')) {

            throw new InvalidArgumentException('Given stream resource is not opened in read mode');

        }

        // this class relies on non-blocking I/O in order to not interrupt the event loop

        // e.g. pipes on Windows do not support this: https://bugs.php.net/bug.php?id=47918

        if (\stream_set_blocking($stream, false) !== true) {

            throw new \RuntimeException('Unable to set stream resource to non-blocking mode');

        }

        // Use unbuffered read operations on the underlying stream resource.

        // Reading chunks from the stream may otherwise leave unread bytes in

        // PHP's stream buffers which some event loop implementations do not

        // trigger events on (edge triggered).

        // This does not affect the default event loop implementation (level

        // triggered), so we can ignore platforms not supporting this (HHVM).

        // Pipe streams (such as STDIN) do not seem to require this and legacy

        // PHP versions cause SEGFAULTs on unbuffered pipe streams, so skip this.

        if (\function_exists('stream_set_read_buffer') && !$this->isLegacyPipe($stream)) {

            \stream_set_read_buffer($stream, 0);

        }

        $this->stream = $stream;

        $this->loop = $loop;

        $this->bufferSize = ($readChunkSize === null) ? 65536 : (int)$readChunkSize;

        $this->resume();

    }

    public function isReadable()

    {

        return !$this->closed;

    }

    public function pause()

    {

        if ($this->listening) {

            $this->loop->removeReadStream($this->stream);

            $this->listening = false;

        }

    }

    public function resume()

    {

        if (!$this->listening && !$this->closed) {

            $this->loop->addReadStream($this->stream, array($this, 'handleData'));

            $this->listening = true;

        }

    }

    public function pipe(WritableStreamInterface $dest, array $options = array())

    {

        return Util::pipe($this, $dest, $options);

    }

    public function close()

    {

        if ($this->closed) {

            return;

        }

        $this->closed = true;

        $this->emit('close');

        $this->pause();

        $this->removeAllListeners();

        if (\is_resource($this->stream)) {

            \fclose($this->stream);

        }

    }

    /** @internal */

    public function handleData()

    {

        $error = null;

        \set_error_handler(function ($errno, $errstr, $errfile, $errline) use (&$error) {

            $error = new \ErrorException(

                $errstr,

                0,

                $errno,

                $errfile,

                $errline

            );

        });

        $data = \stream_get_contents($this->stream, $this->bufferSize);

        \restore_error_handler();

        if ($error !== null) {

            $this->emit('error', array(new \RuntimeException('Unable to read from stream: ' . $error->getMessage(), 0, $error)));

            $this->close();

            return;

        }

        if ($data !== '') {

            $this->emit('data', array($data));

        } elseif (\feof($this->stream)) {

            // no data read => we reached the end and close the stream

            $this->emit('end');

            $this->close();

        }

    }

    /**

     * Returns whether this is a pipe resource in a legacy environment

     *

     * This works around a legacy PHP bug (#61019) that was fixed in PHP 5.4.28+

     * and PHP 5.5.12+ and newer.

     *

     * @param resource $resource

     * @return bool

     * @link https://github.com/reactphp/child-process/issues/40

     *

     * @codeCoverageIgnore

     */

    private function isLegacyPipe($resource)

    {

        if (\PHP_VERSION_ID < 50428 || (\PHP_VERSION_ID >= 50500 && \PHP_VERSION_ID < 50512)) {

            $meta = \stream_get_meta_data($resource);

            if (isset($meta['stream_type']) && $meta['stream_type'] === 'STDIO') {

                return true;

            }

        }

        return false;

    }

}