<?php
namespace Aws\Api\Parser;
use \Iterator;
use Aws\Exception\EventStreamDataException;
use Aws\Api\Parser\Exception\ParserException;
use Aws\Api\StructureShape;
use Psr\Http\Message\StreamInterface;
/**
* @internal Implements a decoder for a binary encoded event stream that will
* decode, validate, and provide individual events from the stream.
*/
class EventParsingIterator implements Iterator
{
/** @var StreamInterface */
private $decodingIterator;
/** @var StructureShape */
private $shape;
/** @var AbstractParser */
private $parser;
public function __construct(
StreamInterface $stream,
StructureShape $shape,
AbstractParser $parser
) {
$this->decodingIterator = new DecodingEventStreamIterator($stream);
$this->shape = $shape;
$this->parser = $parser;
}
public function current()
{
return $this->parseEvent($this->decodingIterator->current());
}
public function key()
{
return $this->decodingIterator->key();
}
public function next()
{
$this->decodingIterator->next();
}
public function rewind()
{
$this->decodingIterator->rewind();
}
public function valid()
{
return $this->decodingIterator->valid();
}
private function parseEvent(array $event)
{
if (!empty($event['headers'][':message-type'])) {
if ($event['headers'][':message-type'] === 'error') {
return $this->parseError($event);
}
if ($event['headers'][':message-type'] !== 'event') {
throw new ParserException('Failed to parse unknown message type.');
}
}
if (empty($event['headers'][':event-type'])) {
throw new ParserException('Failed to parse without event type.');
}
$eventShape = $this->shape->getMember($event['headers'][':event-type']);
$parsedEvent = [];
foreach ($eventShape['members'] as $shape => $details) {
if (!empty($details['eventpayload'])) {
$payloadShape = $eventShape->getMember($shape);
if ($payloadShape['type'] === 'blob') {
$parsedEvent[$shape] = $event['payload'];
} else {
$parsedEvent[$shape] = $this->parser->parseMemberFromStream(
$event['payload'],
$payloadShape,
null
);
}
} else {
$parsedEvent[$shape] = $event['headers'][$shape];
}
}
return [
$event['headers'][':event-type'] => $parsedEvent
];
}
private function parseError(array $event)
{
throw new EventStreamDataException(
$event['headers'][':error-code'],
$event['headers'][':error-message']
);
}
}