271 lines
10 KiB
PHP
271 lines
10 KiB
PHP
<?php
|
|
|
|
namespace WP_Ultimo\Dependencies\Amp\ByteStream;
|
|
|
|
use WP_Ultimo\Dependencies\Amp\Deferred;
|
|
use WP_Ultimo\Dependencies\Amp\Failure;
|
|
use WP_Ultimo\Dependencies\Amp\Loop;
|
|
use WP_Ultimo\Dependencies\Amp\Promise;
|
|
use WP_Ultimo\Dependencies\Amp\Success;
|
|
/**
|
|
* Output stream abstraction for PHP's stream resources.
|
|
*/
|
|
final class ResourceOutputStream implements OutputStream
|
|
{
|
|
const MAX_CONSECUTIVE_EMPTY_WRITES = 3;
|
|
const LARGE_CHUNK_SIZE = 128 * 1024;
|
|
/** @var resource|null */
|
|
private $resource;
|
|
/** @var string */
|
|
private $watcher;
|
|
/** @var \SplQueue<array> */
|
|
private $writes;
|
|
/** @var bool */
|
|
private $writable = \true;
|
|
/** @var int|null */
|
|
private $chunkSize;
|
|
/**
|
|
* @param resource $stream Stream resource.
|
|
* @param int|null $chunkSize Chunk size per `fwrite()` operation.
|
|
*/
|
|
public function __construct($stream, int $chunkSize = null)
|
|
{
|
|
if (!\is_resource($stream) || \get_resource_type($stream) !== 'stream') {
|
|
throw new \Error("Expected a valid stream");
|
|
}
|
|
$meta = \stream_get_meta_data($stream);
|
|
if (\strpos($meta["mode"], "r") !== \false && \strpos($meta["mode"], "+") === \false) {
|
|
throw new \Error("Expected a writable stream");
|
|
}
|
|
\stream_set_blocking($stream, \false);
|
|
\stream_set_write_buffer($stream, 0);
|
|
$this->resource = $stream;
|
|
$this->chunkSize =& $chunkSize;
|
|
$writes = $this->writes = new \SplQueue();
|
|
$writable =& $this->writable;
|
|
$resource =& $this->resource;
|
|
$this->watcher = Loop::onWritable($stream, static function ($watcher, $stream) use($writes, &$chunkSize, &$writable, &$resource) {
|
|
static $emptyWrites = 0;
|
|
try {
|
|
while (!$writes->isEmpty()) {
|
|
/** @var Deferred $deferred */
|
|
list($data, $previous, $deferred) = $writes->shift();
|
|
$length = \strlen($data);
|
|
if ($length === 0) {
|
|
$deferred->resolve(0);
|
|
continue;
|
|
}
|
|
if (!\is_resource($stream) || ($metaData = @\stream_get_meta_data($stream)) && $metaData['eof']) {
|
|
throw new ClosedException("The stream was closed by the peer");
|
|
}
|
|
// Error reporting suppressed since fwrite() emits E_WARNING if the pipe is broken or the buffer is full.
|
|
// Use conditional, because PHP doesn't like getting null passed
|
|
if ($chunkSize) {
|
|
$written = @\fwrite($stream, $data, $chunkSize);
|
|
} else {
|
|
$written = @\fwrite($stream, $data);
|
|
}
|
|
\assert(
|
|
$written !== \false || \PHP_VERSION_ID >= 70400,
|
|
// PHP 7.4+ returns false on EPIPE.
|
|
"Trying to write on a previously fclose()'d resource. Do NOT manually fclose() resources the still referenced in the loop."
|
|
);
|
|
// PHP 7.4.0 and 7.4.1 may return false on EAGAIN.
|
|
if ($written === \false && \PHP_VERSION_ID >= 70402) {
|
|
$message = "Failed to write to stream";
|
|
if ($error = \error_get_last()) {
|
|
$message .= \sprintf("; %s", $error["message"]);
|
|
}
|
|
throw new StreamException($message);
|
|
}
|
|
// Broken pipes between processes on macOS/FreeBSD do not detect EOF properly.
|
|
if ($written === 0 || $written === \false) {
|
|
if ($emptyWrites++ > self::MAX_CONSECUTIVE_EMPTY_WRITES) {
|
|
$message = "Failed to write to stream after multiple attempts";
|
|
if ($error = \error_get_last()) {
|
|
$message .= \sprintf("; %s", $error["message"]);
|
|
}
|
|
throw new StreamException($message);
|
|
}
|
|
$writes->unshift([$data, $previous, $deferred]);
|
|
return;
|
|
}
|
|
$emptyWrites = 0;
|
|
if ($length > $written) {
|
|
$data = \substr($data, $written);
|
|
$writes->unshift([$data, $written + $previous, $deferred]);
|
|
return;
|
|
}
|
|
$deferred->resolve($written + $previous);
|
|
}
|
|
} catch (\Throwable $exception) {
|
|
$resource = null;
|
|
$writable = \false;
|
|
/** @psalm-suppress PossiblyUndefinedVariable */
|
|
$deferred->fail($exception);
|
|
while (!$writes->isEmpty()) {
|
|
list(, , $deferred) = $writes->shift();
|
|
$deferred->fail($exception);
|
|
}
|
|
Loop::cancel($watcher);
|
|
} finally {
|
|
if ($writes->isEmpty()) {
|
|
Loop::disable($watcher);
|
|
}
|
|
}
|
|
});
|
|
Loop::disable($this->watcher);
|
|
}
|
|
/**
|
|
* Writes data to the stream.
|
|
*
|
|
* @param string $data Bytes to write.
|
|
*
|
|
* @return Promise Succeeds once the data has been successfully written to the stream.
|
|
*
|
|
* @throws ClosedException If the stream has already been closed.
|
|
*/
|
|
public function write(string $data) : Promise
|
|
{
|
|
return $this->send($data, \false);
|
|
}
|
|
/**
|
|
* Closes the stream after all pending writes have been completed. Optionally writes a final data chunk before.
|
|
*
|
|
* @param string $finalData Bytes to write.
|
|
*
|
|
* @return Promise Succeeds once the data has been successfully written to the stream.
|
|
*
|
|
* @throws ClosedException If the stream has already been closed.
|
|
*/
|
|
public function end(string $finalData = "") : Promise
|
|
{
|
|
return $this->send($finalData, \true);
|
|
}
|
|
private function send(string $data, bool $end = \false) : Promise
|
|
{
|
|
if (!$this->writable) {
|
|
return new Failure(new ClosedException("The stream is not writable"));
|
|
}
|
|
$length = \strlen($data);
|
|
$written = 0;
|
|
if ($end) {
|
|
$this->writable = \false;
|
|
}
|
|
if ($this->writes->isEmpty()) {
|
|
if ($length === 0) {
|
|
if ($end) {
|
|
$this->close();
|
|
}
|
|
return new Success(0);
|
|
}
|
|
if (!\is_resource($this->resource) || ($metaData = @\stream_get_meta_data($this->resource)) && $metaData['eof']) {
|
|
return new Failure(new ClosedException("The stream was closed by the peer"));
|
|
}
|
|
// Error reporting suppressed since fwrite() emits E_WARNING if the pipe is broken or the buffer is full.
|
|
// Use conditional, because PHP doesn't like getting null passed.
|
|
if ($this->chunkSize) {
|
|
$written = @\fwrite($this->resource, $data, $this->chunkSize);
|
|
} else {
|
|
$written = @\fwrite($this->resource, $data);
|
|
}
|
|
\assert(
|
|
$written !== \false || \PHP_VERSION_ID >= 70400,
|
|
// PHP 7.4+ returns false on EPIPE.
|
|
"Trying to write on a previously fclose()'d resource. Do NOT manually fclose() resources the still referenced in the loop."
|
|
);
|
|
// PHP 7.4.0 and 7.4.1 may return false on EAGAIN.
|
|
if ($written === \false && \PHP_VERSION_ID >= 70402) {
|
|
$message = "Failed to write to stream";
|
|
if ($error = \error_get_last()) {
|
|
$message .= \sprintf("; %s", $error["message"]);
|
|
}
|
|
return new Failure(new StreamException($message));
|
|
}
|
|
$written = (int) $written;
|
|
// Cast potential false to 0.
|
|
if ($length === $written) {
|
|
if ($end) {
|
|
$this->close();
|
|
}
|
|
return new Success($written);
|
|
}
|
|
$data = \substr($data, $written);
|
|
}
|
|
$deferred = new Deferred();
|
|
if ($length - $written > self::LARGE_CHUNK_SIZE) {
|
|
$chunks = \str_split($data, self::LARGE_CHUNK_SIZE);
|
|
$data = \array_pop($chunks);
|
|
foreach ($chunks as $chunk) {
|
|
$this->writes->push([$chunk, $written, new Deferred()]);
|
|
$written += self::LARGE_CHUNK_SIZE;
|
|
}
|
|
}
|
|
$this->writes->push([$data, $written, $deferred]);
|
|
Loop::enable($this->watcher);
|
|
$promise = $deferred->promise();
|
|
if ($end) {
|
|
$promise->onResolve([$this, "close"]);
|
|
}
|
|
return $promise;
|
|
}
|
|
/**
|
|
* Closes the stream forcefully. Multiple `close()` calls are ignored.
|
|
*
|
|
* @return void
|
|
*/
|
|
public function close()
|
|
{
|
|
if (\is_resource($this->resource)) {
|
|
// Error suppression, as resource might already be closed
|
|
$meta = @\stream_get_meta_data($this->resource);
|
|
if ($meta && \strpos($meta["mode"], "+") !== \false) {
|
|
@\stream_socket_shutdown($this->resource, \STREAM_SHUT_WR);
|
|
} else {
|
|
/** @psalm-suppress InvalidPropertyAssignmentValue psalm reports this as closed-resource */
|
|
@\fclose($this->resource);
|
|
}
|
|
}
|
|
$this->free();
|
|
}
|
|
/**
|
|
* Nulls reference to resource, marks stream unwritable, and fails any pending write.
|
|
*
|
|
* @return void
|
|
*/
|
|
private function free()
|
|
{
|
|
$this->resource = null;
|
|
$this->writable = \false;
|
|
if (!$this->writes->isEmpty()) {
|
|
$exception = new ClosedException("The socket was closed before writing completed");
|
|
do {
|
|
/** @var Deferred $deferred */
|
|
list(, , $deferred) = $this->writes->shift();
|
|
$deferred->fail($exception);
|
|
} while (!$this->writes->isEmpty());
|
|
}
|
|
Loop::cancel($this->watcher);
|
|
}
|
|
/**
|
|
* @return resource|null Stream resource or null if end() has been called or the stream closed.
|
|
*/
|
|
public function getResource()
|
|
{
|
|
return $this->resource;
|
|
}
|
|
/**
|
|
* @return void
|
|
*/
|
|
public function setChunkSize(int $chunkSize)
|
|
{
|
|
$this->chunkSize = $chunkSize;
|
|
}
|
|
public function __destruct()
|
|
{
|
|
if ($this->resource !== null) {
|
|
$this->free();
|
|
}
|
|
}
|
|
}
|