I'm trying to use the google/protobuf package for php, but am running into
an issue that I don't understand. When trying to construct an instance of
the generated class I'm met with the following exception
InvalidArgumentException: Famly\Queue\Model\Proto\ExportRequest is not
found in descriptor pool. Only generated classes may derive from Message.
I have added the following to `composer.json`
```
"require": {
...,
"google/protobuf": "^3.19"
}.
"psr-0": {
"Famly\\Queue": "Packages/Application/Famly/Queue"
}
````
I'm using `protoc` version 3.19.4 and generated the the files with
protoc --proto_path="famlyqueue/src/main/protobuf"
--php_out="core/Packages/Application/Famly.Queue/Classes"
famlyqueue/src/main/protobuf/co/famly/export/ExportRequest.proto
Here's the `proto` file
```
syntax = "proto3";
package co.famly.export.proto;
option php_namespace = "Famly/Queue/Model/Proto";
option php_metadata_namespace = "Famly/Queue/Model/Proto/Meta";
message ExportRequest {
// The ID of the entity to export
string entityId = 1;
// The type of the entity to export
ExportEntityType entityType = 2;
}
enum ExportEntityType {
BILL_PAYER = 0;
BILL_PAYER_INVOICES = 1;
CHILD = 2;
LOGIN = 3;
LOGIN_POST_MEDIA = 4;
SITE = 5;
SITE_MEDIA = 6;
}
```
And the test where I'm trying to construct the class instance (simply
roundtrip test)
```
<?php
namespace Famly\Queue\Model\Proto;
use Neos\Flow\Tests\UnitTestCase;
use Neos\Flow\Utility\Algorithms;
class ExportRequestTest extends UnitTestCase {
/**
* @test
*/
public function canRoundtripSerialization() {
$from = new ExportRequest();
$entityId = Algorithms::generateUUID();
$from->setEntityId($entityId);
$from->setEntityType(ExportEntityType::SITE);
$serialized = $from->serializeToString();
$to = new ExportRequest();
$to->mergeFromString($serialized);
$this->assertEquals($to->getEntityId(), $entityId);
$this->assertEquals($to->getEntityType(), ExportEntityType::SITE);
}
}
```
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