# Nsq PHP

<img src="https://github.com/nsqphp/nsqphp/raw/main/logo.png" alt="" align="left" width="150">

PHP Client for [NSQ](https://nsq.io/).

[![Latest Stable Version](https://poser.pugx.org/nsq/nsq/v)](//packagist.org/packages/nsq/nsq) [![Total Downloads](https://poser.pugx.org/nsq/nsq/downloads)](//packagist.org/packages/nsq/nsq) [![Latest Unstable Version](https://poser.pugx.org/nsq/nsq/v/unstable)](//packagist.org/packages/nsq/nsq) [![License](https://poser.pugx.org/nsq/nsq/license)](//packagist.org/packages/nsq/nsq)
[![codecov](https://codecov.io/gh/nsqphp/nsqphp/branch/main/graph/badge.svg?token=AYUMC3OO2B)](https://codecov.io/gh/nsqphp/nsqphp)

This library follow [SemVer](https://semver.org/). Until version 1.0 will be released anything MAY change at any time, public API SHOULD NOT be considered stable. If you want use it before stable version was released install strict version without range.

Installation
------------

This library is installable via [Composer](https://getcomposer.org/):

```bash
composer require nsq/nsq
```

Requirements
------------

This library requires PHP 7.4 or later.

Although not required, it is recommended that you install the [phpinnacle/ext-buffer](https://github.com/phpinnacle/ext-buffer) to speed up [phpinnacle/buffer](https://github.com/phpinnacle/buffer) .

Features
--------

- [x] PUB
- [x] SUB
- [ ] Feature Negotiation	
- [ ] Discovery	
- [ ] Backoff	
- [ ] TLS	
- [ ] Snappy	
- [ ] Sampling	
- [ ] AUTH

Usage
-----

### Publish

```php
use Nsq\Writer;

$writer = new Writer(address: 'tcp://nsqd:4150');

// Publish a message to a topic
$writer->pub('topic', 'Simple message');

// Publish multiple messages to a topic (atomically) 
$writer->mpub('topic', [
    'Message one',
    'Message two',
]);

// Publish a deferred message to a topic
$writer->dpub('topic', 5000, 'Deferred message');
```

### Subscription

```php
use Nsq\Envelope;
use Nsq\Subscriber;

$subscriber = new Subscriber(address: 'tcp://nsqd:4150');

$generator = $subscriber->subscribe('topic', 'channel', timeout: 5);
foreach ($generator as $envelope) {
    if (null === $envelope) {
        // No message received while timeout
        // Good place to pcntl_signal_dispatch() or whatever
        
        continue;
    }

    if ($envelope instanceof Envelope) {
        $payload = $envelope->message->body;

        // handle message

        $envelope->touch(); // Reset the timeout for an in-flight message        
        $envelope->requeue(timeout: 5000); // Re-queue a message (indicate failure to process)        
        $envelope->finish(); // Finish a message (indicate successful processing)        
    }
    
    if ($stopSignalReceived) {
        $generator->send(Subscriber::STOP); // Gracefully close connection
    }

    // Dynamically change timeout 
    $generator->send(Subscriber::CHANGE_TIMEOUT);
    $generator->send(10.0); // float required
}
```

### Integrations

- [Symfony](https://github.com/nsqphp/NsqBundle)

License:
--------

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