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