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<?php
namespace React\Stream;
final class Util
{
/**
* Pipes all the data from the given $source into the $dest
*
* @param ReadableStreamInterface $source
* @param WritableStreamInterface $dest
* @param array $options
* @return WritableStreamInterface $dest stream as-is
* @see ReadableStreamInterface::pipe() for more details
*/
public static function pipe(ReadableStreamInterface $source, WritableStreamInterface $dest, array $options = array())
{
// source not readable => NO-OP
if (!$source->isReadable()) {
return $dest;
}
// destination not writable => just pause() source
if (!$dest->isWritable()) {
$source->pause();
return $dest;
}
$dest->emit('pipe', array($source));
// forward all source data events as $dest->write()
$source->on('data', $dataer = function ($data) use ($source, $dest) {
$feedMore = $dest->write($data);
if (false === $feedMore) {
$source->pause();
}
});
$dest->on('close', function () use ($source, $dataer) {
$source->removeListener('data', $dataer);
$source->pause();
});
// forward destination drain as $source->resume()
$dest->on('drain', $drainer = function () use ($source) {
$source->resume();
});
$source->on('close', function () use ($dest, $drainer) {
$dest->removeListener('drain', $drainer);
});
// forward end event from source as $dest->end()
$end = isset($options['end']) ? $options['end'] : true;
if ($end) {
$source->on('end', $ender = function () use ($dest) {
$dest->end();
});
$dest->on('close', function () use ($source, $ender) {
$source->removeListener('end', $ender);
});
}
return $dest;
}
public static function forwardEvents($source, $target, array $events)
{
foreach ($events as $event) {
$source->on($event, function () use ($event, $target) {
$target->emit($event, \func_get_args());
});
}
}
}