53 lines
1.1 KiB
PHP
53 lines
1.1 KiB
PHP
<?php
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namespace Amp\ByteStream;
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use Amp\Promise;
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use Amp\Success;
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use function Amp\call;
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final class InputStreamChain implements InputStream
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{
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/** @var InputStream[] */
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private $streams;
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/** @var bool */
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private $reading = false;
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public function __construct(InputStream ...$streams)
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{
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$this->streams = $streams;
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}
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/** @inheritDoc */
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public function read(): Promise
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{
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if ($this->reading) {
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throw new PendingReadError;
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}
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if (!$this->streams) {
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return new Success(null);
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}
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return call(function () {
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$this->reading = true;
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try {
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while ($this->streams) {
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$chunk = yield $this->streams[0]->read();
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if ($chunk === null) {
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\array_shift($this->streams);
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continue;
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}
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return $chunk;
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}
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return null;
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} finally {
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$this->reading = false;
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}
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});
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}
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}
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