Ну что, за два дня готов пакет для построения AST для protobuf 👩‍💻 butschster/proto-parser . Уверен всплывут баги и т.д., но тесты есть, кучу edge кейсов покрыл.

Чем он крут? Можно взять proto-файлы, превратить их в дерево PHP-объектов (AST) и далее сгенерировать свои DTO-классы. Например:

syntax = "proto3";

package examplepb;

message Person {
    // Unique identifier for the person.
    uint64 id = 1 [(validate.rules).uint64.gt = 999];

    // Email address will be used for communication.
    string email = 2 [(validate.rules).string.email = true];

    // Full name of the person.
    string name = 3 [(validate.rules).string = {
        pattern:   "^[A-Za-z]+( [A-Za-z]+)*$",
        max_bytes: 256
    }];

    // Home location of the person.
    Location home = 4 [(validate.rules).message.required = true];

    message Location {
        double lat = 1 [(validate.rules).double = {gte: -90,  lte: 90}];
        double lng = 2 [(validate.rules).double = {gte: -180, lte: 180}];
    }
}

service ExampleService {
    // Create a new person.
    rpc CreatePerson(Person) returns (Person) {
        option (google.api.http) = {
            post: "/v1/persons"
            body: "*"
        };
    }
}

use Symfony\Component\Validator\Constraints as Assert;

final readonly class Person
{
    public function __construct(
        /** Unique identifier for the person. */
        #[Assert\GreaterThan(value: 999)]
        public int $id,
        /** Email address will be used for communication. */
        #[Assert\Email]
        public string $email,
        /** Full name of the person. */
        #[Assert\Regex(pattern: '^[A-Za-z]+( [A-Za-z]+)*$'), Assert\Length(max: 256, charset: '8bit')]
        public string $name,
        /** Home location of the person. */
        #[Assert\NotNull]
        public Location $home,
    ) {
    }
}

use Symfony\Component\Validator\Constraints as Assert;

final readonly class Location
{
    public function __construct(
        #[Assert\GreaterThanOrEqual(value: -90), Assert\LessThanOrEqual(value: 90)]
        public float $lat,
        #[Assert\GreaterThanOrEqual(value: -180), Assert\LessThanOrEqual(value: 180)]
        public float $lng,
    ) {
    }
}

<?php

declare(strict_types=1);

namespace Internal;

use App\Grpc\Service;
use OpenApi\Annotations as OA;
use Spiral\RoadRunner\GRPC\ContextInterface;

#[Service(name: 'ExampleService', package: 'examplepb')]
interface ExampleServiceInterface
{
    /**
     * Create a new person.
     */
    #[OA\Post(path: '/v1/persons', tags: ['CreatePerson'])]
    #[OA\RequestBody(path: '*', tags: ['CreatePerson'])]
    public function CreatePerson(ContextInterface $ctx, Person $in): Person;
}