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<?php
namespace Amp\ByteStream;
use Amp\Coroutine;
use Amp\Deferred;
use Amp\Failure;
use Amp\Promise;
use Amp\Success;
/**
* Creates a buffered message from an InputStream. The message can be consumed in chunks using the read() API or it may
* be buffered and accessed in its entirety by waiting for the promise to resolve.
*
* Other implementations may extend this class to add custom properties such as a `isBinary()` flag for WebSocket
* messages.
*
* Buffering Example:
*
* $stream = new Message($inputStream);
* $content = yield $stream;
*
* Streaming Example:
*
* $stream = new Message($inputStream);
*
* while (($chunk = yield $stream->read()) !== null) {
* // Immediately use $chunk, reducing memory consumption since the entire message is never buffered.
* }
*
* @deprecated Use Amp\ByteStream\Payload instead.
*/
class Message implements InputStream, Promise
{
/** @var InputStream */
private $source;
/** @var string */
private $buffer = "";
/** @var Deferred|null */
private $pendingRead;
/** @var Coroutine|null */
private $coroutine;
/** @var bool True if onResolve() has been called. */
private $buffering = false;
/** @var Deferred|null */
private $backpressure;
/** @var bool True if the iterator has completed. */
private $complete = false;
/** @var \Throwable|null Used to fail future reads on failure. */
private $error;
/**
* @param InputStream $source An iterator that only emits strings.
*/
public function __construct(InputStream $source)
{
$this->source = $source;
}
private function consume(): \Generator
{
while (($chunk = yield $this->source->read()) !== null) {
$buffer = $this->buffer .= $chunk;
if ($buffer === "") {
continue; // Do not succeed reads with empty string.
} elseif ($this->pendingRead) {
$deferred = $this->pendingRead;
$this->pendingRead = null;
$this->buffer = "";
$deferred->resolve($buffer);
$buffer = ""; // Destroy last emitted chunk to free memory.
} elseif (!$this->buffering) {
$buffer = ""; // Destroy last emitted chunk to free memory.
$this->backpressure = new Deferred;
yield $this->backpressure->promise();
}
}
$this->complete = true;
if ($this->pendingRead) {
$deferred = $this->pendingRead;
$this->pendingRead = null;
$deferred->resolve($this->buffer !== "" ? $this->buffer : null);
$this->buffer = "";
}
return $this->buffer;
}
/** @inheritdoc */
final public function read(): Promise
{
if ($this->pendingRead) {
throw new PendingReadError;
}
if ($this->coroutine === null) {
$this->coroutine = new Coroutine($this->consume());
$this->coroutine->onResolve(function ($error) {
if ($error) {
$this->error = $error;
}
if ($this->pendingRead) {
$deferred = $this->pendingRead;
$this->pendingRead = null;
$deferred->fail($error);
}
});
}
if ($this->error) {
return new Failure($this->error);
}
if ($this->buffer !== "") {
$buffer = $this->buffer;
$this->buffer = "";
if ($this->backpressure) {
$backpressure = $this->backpressure;
$this->backpressure = null;
$backpressure->resolve();
}
return new Success($buffer);
}
if ($this->complete) {
return new Success;
}
$this->pendingRead = new Deferred;
return $this->pendingRead->promise();
}
/** @inheritdoc */
final public function onResolve(callable $onResolved)
{
$this->buffering = true;
if ($this->coroutine === null) {
$this->coroutine = new Coroutine($this->consume());
}
if ($this->backpressure) {
$backpressure = $this->backpressure;
$this->backpressure = null;
$backpressure->resolve();
}
$this->coroutine->onResolve($onResolved);
}
/**
* Exposes the source input stream.
*
* This might be required to resolve a promise with an InputStream, because promises in Amp can't be resolved with
* other promises.
*
* @return InputStream
*/
final public function getInputStream(): InputStream
{
return $this->source;
}
}
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