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nats

★ 75 Open GitHub ↗

Non-blocking (fiber based) client for Nats.

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# Thesis Nats

Pure non-blocking (fiber based) strictly typed full-featured PHP driver for NATS.

## Features
- [NATS Core](https://docs.nats.io/nats-concepts/core-nats) 
  - [Publish-Subscribe](#pub-sub)
  - [Queues](#queues)
  - [Request-Reply](#request-reply)
- [NATS JetStream](https://docs.nats.io/nats-concepts/jetstream)
  - [Fetch Batch](#fetch-batch)
  - [Fetch Bytes](#fetch-bytes)
  - [Fetch Immediate](#fetch-immediate)
  - [Push Consumer](#push-consumer)
  - [Pull Consumer](#pull-consumer)
  - [Get message](#get-message)
- [NATS KV](https://docs.nats.io/nats-concepts/jetstream/key-value-store)
  - [Store key values](#store-key-values)
  - [Watch KV](#watch-kv)
- [NATS ObjectStore](https://docs.nats.io/nats-concepts/jetstream/obj_store)
  - [Store objects](#store-objects-in-the-buckets)
  - [Watch Object Store](#watch-object-store)
- [NATS CRDT](#nats-crdt)
  - [Add Counter](#add-counter)
  - [Get Counter](#get-counter)
  - [Get Counters](#get-counters)
- [NATS Message Scheduler](#nats-message-scheduler)
  - [Single scheduled message](#single-scheduled-message)
- [NATS JetStream Batch Publishing](#nats-jetstream-batch-publishing)
  - [Publish using `PublishBatch`](#publish-using-publishbatch)
  - [Publish using `JetStream`](#publish-batch-using-jetstream)
- [Nats Service Api](#nats-service-api)
  - [Micro Service](#micro-service) 
  - [Endpoints](#service-endpoints)
  - [Groups](#groups)

## Installation

```shell
composer require thesis/nats
```

## Nats Core

The library implements the full functionality of NATS Core, including pub-sub, queues and request–reply.

#### Pub-Sub

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use function Amp\delay;
use function Amp\trapSignal;

$nc = new Nats\Client(Nats\Config::default());

$nc->subscribe('foo.*', static function (Nats\Delivery $delivery): void {
    dump("Received message {$delivery->message->payload} for consumer#1");
});

$nc->subscribe('foo.>', static function (Nats\Delivery $delivery): void {
    dump("Received message {$delivery->message->payload} for consumer#2");
});

$subscription = $nc->subscribe('foo.bar', static function (Nats\Delivery $delivery): void {
    dump("Received message {$delivery->message->payload} for consumer#3");
});

$nc->publish('foo.bar', new Nats\Message('Hello World!')); // visible for all consumers
$nc->publish('foo.baz', new Nats\Message('Hello World!')); // visible only for 1-2 consumers
$nc->publish('foo.bar.baz', new Nats\Message('Hello World!')); // visible only for 2 consumer

$subscription->stop();
$nc->publish('foo.bar', new Nats\Message('Hello World!')); // visible for 1-2 consumers

trapSignal([\SIGTERM, \SIGINT]);

$nc->drain();
```

#### Queues

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use function Amp\trapSignal;

$nc = new Nats\Client(Nats\Config::default());

$nc->subscribe(
    subject: 'foo.>',
    handler: static function (Nats\Delivery $delivery): void {
        dump("Received message {$delivery->message->payload} for consumer#1");
    },
    queueGroup: 'test',
);

$nc->subscribe(
    subject: 'foo.>',
    handler: static function (Nats\Delivery $delivery): void {
        dump("Received message {$delivery->message->payload} for consumer#2");
    },
    queueGroup: 'test',
);

$nc->subscribe(
    subject: 'foo.>',
    handler: static function (Nats\Delivery $delivery): void {
        dump("Received message {$delivery->message->payload} for consumer#3");
    },
    queueGroup: 'test',
);

$nc->publish('foo.bar', new Nats\Message('x'));
$nc->publish('foo.baz', new Nats\Message('y'));
$nc->publish('foo.bar.baz', new Nats\Message('z'));

trapSignal([\SIGTERM, \SIGINT]);

$nc->drain();
```

#### Request-reply

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;

$nc = new Nats\Client(Nats\Config::default());

$nc->subscribe('foo.>', static function (Nats\Delivery $delivery): void {
    dump("Received request {$delivery->message->payload}");
    $delivery->reply(new Nats\Message(strrev($delivery->message->payload ?? '')));
});

$response = $nc->request('foo.bar', new Nats\Message('Hello World!'));
dump("Received response {$response->message->payload}");

$nc->drain();
```

## Nats JetStream

JetStream is the built-in NATS persistence system. The library provides both JetStream entity management (streams, consumers) and message publishing/consumption capabilities.

#### Fetch Batch

You can request a specific number of messages at once using `PullConsumer::fetch` with `FetchConfig::batch(number_of_messages)`. For example:
```php
<?php

declare(strict_types=1);

use Thesis\Nats;
use Thesis\Nats\JetStream;

$consumer = $stream->createOrUpdateConsumer(...);

$batch = $consumer
    ->pulling()
    ->fetch(JetStream\FetchConfig::batch(10));

foreach ($batch as $delivery) {
    // handle message
    $delivery->ack();
}
```

You can also configure the batch retrieval timeout and heartbeat settings using `FetchConfig::maxWait` and `FetchConfig::heartbeat` parameters.

#### Fetch Bytes

If you want to retrieve a batch of a specific size in bytes, you can use `FetchConfig::bytes(byte_size)`:
```php
<?php

declare(strict_types=1);

use Thesis\Nats;
use Thesis\Nats\JetStream;

$consumer = $stream->createOrUpdateConsumer(...);

$batch = $consumer
    ->pulling()
    ->fetch(JetStream\FetchConfig::bytes(1024));

foreach ($batch as $delivery) {
    // handle message
    $delivery->ack();
}
```

And you can also configure the timeout and heartbeat settings.

#### Fetch Immediate

If you simply want to retrieve a batch of messages currently available in the stream, use `FetchConfig::immediate()`:

```php
<?php

declare(strict_types=1);

use Thesis\Nats;
use Thesis\Nats\JetStream;

$consumer = $stream->createOrUpdateConsumer(...);

$batch = $consumer
    ->pulling()
    ->fetch(JetStream\FetchConfig::immediate());

foreach ($batch as $delivery) {
    // handle message
    $delivery->ack();
}
```

#### Push Consumer

NATS offers two message delivery models: **pull** and **push**. Although the NATS documentation [recommends](https://docs.nats.io/nats-concepts/jetstream/consumers#dispatch-type-pull-push) the pull approach, for most PHP use cases push consumers are often preferable.
Similar to RabbitMQ, push consumers can be configured to avoid negative impacts on both the consumers and the messages themselves.
Key configuration parameters include `maxAckPending`, which limits the number of unacknowledged messages NATS will deliver before waiting (analogous to `prefetch count` in RabbitMQ),
and the `ackPolicy`. This setup allows you to scale message processing by increasing the number of consumers and distribute messages among them more evenly.

For example, if you want to process messages one by one with explicit acknowledgments, you would set `maxAckPending=1` and `ackPolicy=explicit`.

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Api;
use Thesis\Time\TimeSpan;

$consumer = $stream->createOrUpdateConsumer(new Api\ConsumerConfig(
    durableName: 'EventPushConsumer',
    deliverSubject: 'push-consumer-delivery',
    ackPolicy: Api\AckPolicy::Explicit,
    idleHeartbeat: TimeSpan::fromSeconds(5),
    maxAckPending: 1,
));

$subscription = $consumer->push(
    static function (Nats\JetStream\Delivery $delivery): void {
        dump($delivery->message->payload);
        $delivery->ack();
    },
);
```

Additionally, for push consumers, the `deliverSubject` parameter is mandatory, as it is this very parameter that distinguishes the push model from pull.

If you want to distribute messages from a single consumer across different subscriptions, you should use the `deliverGroup` parameter.
This enables you to scale processing across multiple consumer instances. This parameter functions identically to `queueGroup` in NATS Core.

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Api;
use Thesis\Time\TimeSpan;

$consumer = $stream->createOrUpdateConsumer(new Api\ConsumerConfig(
    durableName: 'EventPushConsumer',
    deliverSubject: 'push-consumer-delivery',
    deliverGroup: 'testing',
    ackPolicy: Api\AckPolicy::Explicit,
    idleHeartbeat: TimeSpan::fromSeconds(5),
    maxAckPending: 1,
));
```

Please refer to the push consumer configuration [documentation](https://docs.nats.io/nats-concepts/jetstream/consumers#push-specific) to understand the purpose of each parameter.

#### Pull Consumer

Additionally, you can use `PullConsumer::consume`. This method handles message buffering, periodically requests the server and monitors timeouts to automatically request the next message batch.

Just like with push consumers, you can call `pull` directly on the `Consumer` object:

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Api;
use Thesis\Time\TimeSpan;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$consumer = $stream->createOrUpdateConsumer(new Api\ConsumerConfig(
    durableName: 'EventPullConsumer',
    ackPolicy: Api\AckPolicy::Explicit,
));

$subscription = $consumer->pull(
    static function (Nats\JetStream\Delivery $delivery): void {
        dump($delivery->message->payload);
        $delivery->ack();
    },
);
```

However, if you want to read messages with multiple consumers within the same process, you need to create a `PullConsumer` using `Consumer::pulling()`, and then create multiple consumer instances:

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Api;
use Thesis\Time\TimeSpan;
use function Amp\trapSignal;

$consumer = $stream->createOrUpdateConsumer(new Api\ConsumerConfig(
    durableName: 'EventPullConsumer',
    ackPolicy: Api\AckPolicy::Explicit,
));

$consumer = $consumer->pulling();

$consumer->consume(
    static function (Nats\JetStream\Delivery $delivery): void {
        dump("Consumer#1: {$delivery->message->payload}");
        $delivery->ack();
    },
);

$consumer->consume(
    static function (Nats\JetStream\Delivery $delivery): void {
        dump("Consumer#2: {$delivery->message->payload}");
        $delivery->ack();
    },
);

trapSignal([\SIGINT, \SIGTERM]);

$consumer->drain();
```

To stop all subscriptions, use `Consumer::drain()` or `Consumer::stop()`.

You can control the number of requested messages per batch or the batch size using the `PullConsumeConfig::maxMessages` and `PullConsumeConfig::maxBytes` parameters respectively.
However, only one of these parameters can be set at a time.

```php
<?php

declare(strict_types=1);

use Thesis\Nats\JetStream;;

$consumer->consume(
    static function (Nats\JetStream\Delivery $delivery): void {},
    new JetStream\PullConsumeConfig(
        maxMessages: 1_000,
    ),
);
```

#### Get message

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Api\StreamConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$js->deleteStream('EventStream');

$stream = $js->createStream(new StreamConfig(
    name: 'EventStream',
    description: 'Application events',
    subjects: ['events.*'],
));

for ($i = 0; $i < 5; ++$i) {
    $js->publish(
        subject: 'events.payment_rejected',
        message: new Nats\Message(
            payload: "Message#{$i}",
            headers: (new Nats\Headers())
                ->with(Nats\Header\MsgId::header(), "id:{$i}"),
        ),
    );
}

dump($stream->getLastMessageForSubject('events.payment_rejected')?->payload);

$nc->drain();
```

## NATS Key Value Store

JetStream, the persistence layer of NATS, not only allows for the higher qualities of service and features associated with 'streaming', but it also enables some functionalities not found in messaging systems like Key Value Store.

#### Store key values

```php
<?php

declare(strict_types=1);

require __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\KeyValue\BucketConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$kv = $js->createOrUpdateKeyValue(new BucketConfig(
    bucket: 'configs',
));

$kv->put('app.env', 'prod');
$kv->put('database.dsn', 'mysql:host=127.0.0.1;port=3306');

dump(
    $kv->get('app.env')?->value,
    $kv->get('database.dsn')?->value,
);

$nc->drain();
```

#### Watch KV

```php
<?php

declare(strict_types=1);

require __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\KeyValue\BucketConfig;
use function Amp\trapSignal;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$js->deleteKeyValue('configs');

$kv = $js->createOrUpdateKeyValue(new BucketConfig(
    bucket: 'configs',
));

$subscription = $kv->watch(static function (Nats\JetStream\KeyValue\Entry $entry): void {
    dump("Config key {$entry->key} value changed to {$entry->value}");
});

$kv->put('app.env', 'prod');
$kv->put('database.dsn', 'mysql:host=127.0.0.1;port=3306');

trapSignal([\SIGTERM, \SIGINT]);

$subscription->stop();

$nc->drain();
```

## NATS Object Store

#### Store objects in the buckets

```php
<?php

declare(strict_types=1);

require __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\ObjectStore\ObjectMeta;
use Thesis\Nats\JetStream\ObjectStore\ResourceReader;
use Thesis\Nats\JetStream\ObjectStore\StoreConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$js->deleteObjectStore('code');

$store = $js->createOrUpdateObjectStore(new StoreConfig(
    store: 'code',
));

$handle = fopen(__DIR__.'/app.php', 'r') ?? throw new \RuntimeException('Failed to open file.');

$store->put(new ObjectMeta(name: 'app.php'), new ResourceReader($handle));

fclose($handle);

$store->put(new ObjectMeta('config.php'), '<?php return [];');

dump(
    (string) $store->get('app.php'),
    (string) $store->get('config.php'),
);

$nc->drain();
```

#### Watch Object Store

```php
<?php

declare(strict_types=1);

require __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\ObjectStore\ObjectInfo;
use Thesis\Nats\JetStream\ObjectStore\ObjectMeta;
use Thesis\Nats\JetStream\ObjectStore\StoreConfig;
use function Amp\delay;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$js->deleteObjectStore('code');

$store = $js->createOrUpdateObjectStore(new StoreConfig(
    store: 'code',
));

$subscription = $store->watch(static function (ObjectInfo $info): void {
    dump("New object {$info->name} in the bucket {$info->bucket} at size {$info->size} bytes");
});

$store->put(new ObjectMeta('config.php'), '<?php return [];');
$store->put(new ObjectMeta('snippet.php'), '<?php echo 1 + 1;');

delay(0.5);

$subscription->stop();

$nc->drain();
```

## NATS CRDT

Distributed Counter CRDT. A Stream can opt in to supporting Counters which will allow any subject to be a counter. All subjects in the stream must be counters.
See [ADR-49](https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-49.md) for details.

#### Add Counter

```php
<?php

declare(strict_types=1);

require __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Counter\CounterConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$counter = $js->createOrUpdateCounter(new CounterConfig(
    name: 'atomics',
));

dump($counter->add('x', 1)); // 1
dump($counter->add('x', 2)); // 3
```

#### Get Counter

```php
<?php

declare(strict_types=1);

require __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Counter\CounterConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$counter = $js->createOrUpdateCounter(new CounterConfig(
    name: 'atomics',
));

dump($counter->add('x', 1)); // 1
dump($counter->get('x')?->value); // 1
```

#### Get Counters

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Counter\CounterConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$jetstream->deleteCounter('atomics');

$counter = $js->createOrUpdateCounter(new CounterConfig(
    name: 'atomics',
));

$counter->add('x', 1);
$counter->add('y', 1);
$counter->add('z', 1);

foreach ($counter->getMultiple() as $entry) {
    echo "{$entry->subject}: {$entry->value}\n";
}
```

## NATS Message Scheduler

Delayed Message Scheduling. The `AllowMsgSchedules` stream configuration option allows the scheduling of messages. Users can use this feature for delayed publishing/scheduling of messages.
See [ADR-51](https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-51.md) for details.

#### Single scheduled message

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\Header;
use Thesis\Nats\JetStream\Api\AckPolicy;
use Thesis\Nats\JetStream\Api\ConsumerConfig;
use Thesis\Nats\JetStream\Api\StreamConfig;
use Thesis\Nats\JetStream\Api\DeliverPolicy;
use function Amp\trapSignal;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$stream = $js->createStream(new StreamConfig(
    name: 'RecurrentsStream',
    subjects: [
        'recurrents',
        'scheduler.recurrents.*',
    ],
    allowMsgSchedules: true,
));

$js->publish('scheduler.recurrents.1', new Nats\Message(
    payload: '{"id":1}',
    headers: (new Nats\Headers())
        ->with(Header\Schedule::Header, new \DateTimeImmutable('+5 seconds'))
        ->with(Header\ScheduleTarget::header(), 'recurrents'),
));

$subscription = $stream
    ->createOrUpdateConsumer(new ConsumerConfig(
        durableName: 'RecurrentsConsumer',
        deliverPolicy: DeliverPolicy::New,
        ackPolicy: AckPolicy::None,
        filterSubjects: ['recurrents'],
    ))
    ->pull(static function (Nats\JetStream\Delivery $delivery): void {
        dump([
            $delivery->message->payload,
            $delivery->message->headers?->get(Header\Scheduler::header()),
            $delivery->message->headers?->get(Header\ScheduleNext::header()),
        ]);
    });

trapSignal([\SIGINT, \SIGTERM]);

$subscription->awaitCompletion();
```

## NATS JetStream Batch Publishing

The `AllowAtomicPublish` stream configuration option allows to atomically publish N messages into a stream. See [ADR-50](https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-50.md) for details.

#### Publish using `PublishBatch`

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Api\StreamConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$stream = $js->createStream(new StreamConfig(
    name: 'Batches',
    description: 'Batch Stream',
    subjects: ['batch.*'],
    allowAtomicPublish: true,
));

$batch = $js->createPublishBatch();

for ($i = 0; $i < 999; ++$i) {
    $batch->publish('batch.orders', new Nats\Message("Order#{$i}"));
}

$batch->publish('batch.orders', new Nats\Message('Order#1000'), new Nats\PublishBatchOptions(commit: true));
```

#### Publish batch using JetStream

```php
<?php

declare(strict_types=1);

require_once __DIR__ . '/vendor/autoload.php';

use Thesis\Nats;
use Thesis\Nats\JetStream\Api\StreamConfig;

$nc = new Nats\Client(Nats\Config::default());
$js = $nc->jetStream();

$stream = $js->createStream(new StreamConfig(
    name: 'Batches',
    description: 'Batch Stream',
    subjects: ['batch.*'],
    allowAtomicPublish: true,
));

$js->publishBatch('batch.orders', [
    new Nats\Message('Order#1'),
    new Nats\Message('Order#2'),
    new Nats\Message('Order#3'),
]);
```

## Nats Service Api

This is implementation of [ADR-32](https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-32.md).
The core of the `Micro` component is the `Service`. A `Service` aggregates endpoints for handling application logic. Services are named and versioned. You create a Service using the `Client::createService()`, passing in the `Service` configuration.

#### Micro Service

```php
<?php

declare(strict_types=1);

use Thesis\Nats;
use Thesis\Nats\Micro;

require __DIR__ . '/vendor/autoload.php';

$nc = new Nats\Client(
    Nats\Config::default(),
);

$srv = $nc->createService(new Micro\ServiceConfig('EchoService', '1.0.0'));
```

#### Service endpoints

After a service is created, endpoints can be added. By default, an endpoint is available via its name.

```php
<?php

declare(strict_types=1);

use Thesis\Nats;
use Thesis\Nats\Micro;

require __DIR__ . '/vendor/autoload.php';

$nc = new Nats\Client(
    Nats\Config::default(),
);

$srv = $nc->createService(new Micro\ServiceConfig('EchoService', '1.0.0'));

$srv
    ->addEndpoint(new Micro\EndpointConfig('srv.echo'), static function (Micro\Request $request): void {
        $request->respond(new Micro\Response($request->data));
    });

dump($nc->request('srv.echo', new Nats\Message('ping'))->message->payload);
```

If the subject for the endpoint is more complex (e.g., contains a `*` or `>`), the subject can be specified separately from the name.

```php
<?php

declare(strict_types=1);

use Thesis\Nats;
use Thesis\Nats\Micro;

require __DIR__ . '/vendor/autoload.php';

$nc = new Nats\Client(
    Nats\Config::default(),
);

$srv = $nc->createService(new Micro\ServiceConfig('EchoService', '1.0.0'));

$srv
    ->addEndpoint(new Micro\EndpointConfig('srv.echo', subject: 'srv.echo.*'), static function (Micro\Request $request): void {
        $request->respond(new Micro\Response($request->subject));
    });

dump($nc->request('srv.echo.x', new Nats\Message('ping'))->message->payload);
```

#### Groups

Endpoints can also be aggregated using groups. A group represents a common subject prefix used by all endpoints associated with it.

```php
<?php

declare(strict_types=1);

use Thesis\Nats;
use Thesis\Nats\Micro;

require __DIR__ . '/vendor/autoload.php';

$nc = new Nats\Client(
    Nats\Config::fromURI('tcp://user:Pswd1@nats-1:4222'),
);

$nc
    ->createService(new Micro\ServiceConfig('EchoService', '1.0.0'))
        ->addGroup(new Micro\GroupConfig('srv.api'))
            ->addGroup(new Micro\GroupConfig('v1'))
                ->addEndpoint(new Micro\EndpointConfig('echo'), static function (Micro\Request $request): void {
                    $request->respond(new Micro\Response($request->data));
                });

dump($nc->request('srv.api.v1.echo', new Nats\Message('ping'))->message->payload);
```

## License

The MIT License (MIT). Please see [License File](LICENSE) for more information.

nats

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