Viewing file:  EventParsingIterator.php (4.18 KB) -rw-r--r--
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<?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;
}
#[\ReturnTypeWillChange]
public function current()
{
return $this->parseEvent($this->decodingIterator->current());
}
#[\ReturnTypeWillChange]
public function key()
{
return $this->decodingIterator->key();
}
#[\ReturnTypeWillChange]
public function next()
{
$this->decodingIterator->next();
}
#[\ReturnTypeWillChange]
public function rewind()
{
$this->decodingIterator->rewind();
}
#[\ReturnTypeWillChange]
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.');
}
}
$eventType = $event['headers'][':event-type'] ?? null;
if (empty($eventType)) {
throw new ParserException('Failed to parse without event type.');
}
$eventShape = $this->shape->getMember($eventType);
$eventPayload = $event['payload'];
return [
$eventType => array_merge(
$this->parseEventHeaders($event['headers'], $eventShape),
$this->parseEventPayload($eventPayload, $eventShape)
)
];
}
/**
* @param $headers
* @param $eventShape
*
* @return array
*/
private function parseEventHeaders($headers, $eventShape): array
{
$parsedHeaders = [];
foreach ($eventShape->getMembers() as $memberName => $memberProps) {
if (isset($memberProps['eventheader'])) {
$parsedHeaders[$memberName] = $headers[$memberName];
}
}
return $parsedHeaders;
}
/**
* @param $payload
* @param $eventShape
*
* @return array
*/
private function parseEventPayload($payload, $eventShape): array
{
$parsedPayload = [];
foreach ($eventShape->getMembers() as $memberName => $memberProps) {
$memberShape = $eventShape->getMember($memberName);
if (isset($memberProps['eventpayload'])) {
if ($memberShape->getType() === 'blob') {
$parsedPayload[$memberName] = $payload;
} else {
$parsedPayload[$memberName] = $this->parser->parseMemberFromStream(
$payload,
$memberShape,
null
);
}
break;
}
}
if (empty($parsedPayload) && !empty($payload->getContents())) {
/**
* If we did not find a member with an eventpayload trait, then we should deserialize the payload
* using the event's shape.
*/
$parsedPayload = $this->parser->parseMemberFromStream($payload, $eventShape, null);
}
return $parsedPayload;
}
private function parseError(array $event)
{
throw new EventStreamDataException(
$event['headers'][':error-code'],
$event['headers'][':error-message']
);
}
}
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