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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Process\Pipes;
use Symfony\Component\Process\Exception\InvalidArgumentException;
/**
* @author Romain Neutron <imprec@gmail.com>
*
* @internal
*/
abstract class AbstractPipes implements PipesInterface
{
public array $pipes = [];
private string $inputBuffer = '';
/** @var resource|string|\Iterator */
private $input;
private bool $blocked = true;
private ?string $lastError = null;
/**
* @param resource|string|\Iterator $input
*/
public function __construct($input)
{
if (\is_resource($input) || $input instanceof \Iterator) {
$this->input = $input;
} else {
$this->inputBuffer = (string) $input;
}
}
public function close(): void
{
foreach ($this->pipes as $pipe) {
if (\is_resource($pipe)) {
fclose($pipe);
}
}
$this->pipes = [];
}
/**
* Returns true if a system call has been interrupted.
*
* stream_select() returns false when the `select` system call is interrupted by an incoming signal.
*/
protected function hasSystemCallBeenInterrupted(): bool
{
$lastError = $this->lastError;
$this->lastError = null;
if (null === $lastError) {
return false;
}
if (false !== stripos($lastError, 'interrupted system call')) {
return true;
}
// on applications with a different locale than english, the message above is not found because
// it's translated. So we also check for the SOCKET_EINTR constant which is defined under
// Windows and UNIX-like platforms (if available on the platform).
return \defined('SOCKET_EINTR') && str_starts_with($lastError, 'stream_select(): Unable to select ['.\SOCKET_EINTR.']');
}
/**
* Unblocks streams.
*/
protected function unblock(): void
{
if (!$this->blocked) {
return;
}
foreach ($this->pipes as $pipe) {
stream_set_blocking($pipe, false);
}
if (\is_resource($this->input)) {
stream_set_blocking($this->input, false);
}
$this->blocked = false;
}
/**
* Writes input to stdin.
*
* @throws InvalidArgumentException When an input iterator yields a non supported value
*/
protected function write(): ?array
{
if (!isset($this->pipes[0])) {
return null;
}
$input = $this->input;
if ($input instanceof \Iterator) {
if (!$input->valid()) {
$input = null;
} elseif (\is_resource($input = $input->current())) {
stream_set_blocking($input, false);
} elseif (!isset($this->inputBuffer[0])) {
if (!\is_string($input)) {
if (!\is_scalar($input)) {
throw new InvalidArgumentException(\sprintf('"%s" yielded a value of type "%s", but only scalars and stream resources are supported.', get_debug_type($this->input), get_debug_type($input)));
}
$input = (string) $input;
}
$this->inputBuffer = $input;
$this->input->next();
$input = null;
} else {
$input = null;
}
}
$r = $e = [];
$w = [$this->pipes[0]];
// let's have a look if something changed in streams
if (false === @stream_select($r, $w, $e, 0, 0)) {
return null;
}
foreach ($w as $stdin) {
if (isset($this->inputBuffer[0])) {
$written = fwrite($stdin, $this->inputBuffer);
$this->inputBuffer = substr($this->inputBuffer, $written);
if (isset($this->inputBuffer[0])) {
return [$this->pipes[0]];
}
}
if ($input) {
while (true) {
$data = fread($input, self::CHUNK_SIZE);
if (!isset($data[0])) {
break;
}
$written = fwrite($stdin, $data);
$data = substr($data, $written);
if (isset($data[0])) {
$this->inputBuffer = $data;
return [$this->pipes[0]];
}
}
if (feof($input)) {
if ($this->input instanceof \Iterator) {
$this->input->next();
} else {
$this->input = null;
}
}
}
}
// no input to read on resource, buffer is empty
if (!isset($this->inputBuffer[0]) && !($this->input instanceof \Iterator ? $this->input->valid() : $this->input)) {
$this->input = null;
fclose($this->pipes[0]);
unset($this->pipes[0]);
} elseif (!$w) {
return [$this->pipes[0]];
}
return null;
}
/**
* @internal
*/
public function handleError(int $type, string $msg): void
{
$this->lastError = $msg;
}
}