103 lines
3.2 KiB
PHP
103 lines
3.2 KiB
PHP
<?php
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namespace WP_Ultimo\Dependencies\Amp\Process;
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use WP_Ultimo\Dependencies\Amp\ByteStream\InputStream;
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use WP_Ultimo\Dependencies\Amp\ByteStream\PendingReadError;
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use WP_Ultimo\Dependencies\Amp\ByteStream\ResourceInputStream;
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use WP_Ultimo\Dependencies\Amp\ByteStream\StreamException;
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use WP_Ultimo\Dependencies\Amp\Deferred;
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use WP_Ultimo\Dependencies\Amp\Failure;
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use WP_Ultimo\Dependencies\Amp\Promise;
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use WP_Ultimo\Dependencies\Amp\Success;
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final class ProcessInputStream implements InputStream
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{
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/** @var Deferred */
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private $initialRead;
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/** @var bool */
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private $shouldClose = \false;
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/** @var bool */
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private $referenced = \true;
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/** @var ResourceInputStream */
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private $resourceStream;
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/** @var StreamException|null */
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private $error;
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public function __construct(Promise $resourceStreamPromise)
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{
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$resourceStreamPromise->onResolve(function ($error, $resourceStream) {
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if ($error) {
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$this->error = new StreamException("Failed to launch process", 0, $error);
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if ($this->initialRead) {
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$initialRead = $this->initialRead;
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$this->initialRead = null;
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$initialRead->fail($this->error);
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}
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return;
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}
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$this->resourceStream = $resourceStream;
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if (!$this->referenced) {
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$this->resourceStream->unreference();
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}
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if ($this->shouldClose) {
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$this->resourceStream->close();
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}
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if ($this->initialRead) {
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$initialRead = $this->initialRead;
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$this->initialRead = null;
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$initialRead->resolve($this->shouldClose ? null : $this->resourceStream->read());
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}
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});
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}
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/**
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* Reads data from the stream.
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*
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* @return Promise Resolves with a string when new data is available or `null` if the stream has closed.
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*
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* @throws PendingReadError Thrown if another read operation is still pending.
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*/
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public function read() : Promise
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{
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if ($this->initialRead) {
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throw new PendingReadError();
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}
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if ($this->error) {
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return new Failure($this->error);
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}
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if ($this->resourceStream) {
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return $this->resourceStream->read();
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}
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if ($this->shouldClose) {
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return new Success();
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// Resolve reads on closed streams with null.
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}
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$this->initialRead = new Deferred();
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return $this->initialRead->promise();
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}
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public function reference()
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{
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$this->referenced = \true;
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if ($this->resourceStream) {
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$this->resourceStream->reference();
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}
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}
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public function unreference()
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{
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$this->referenced = \false;
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if ($this->resourceStream) {
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$this->resourceStream->unreference();
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}
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}
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public function close()
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{
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$this->shouldClose = \true;
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if ($this->initialRead) {
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$initialRead = $this->initialRead;
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$this->initialRead = null;
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$initialRead->resolve();
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}
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if ($this->resourceStream) {
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$this->resourceStream->close();
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}
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}
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}
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