Google PubSub (Laravel Broadcaster)

Laravel Broadcaster using Google PubSub

⚠️ NOTE: Currently on development, changes may drastically occur without further notice

Requirements

• PHP ^7.1
• Laravel/Lumen ^7.0 (support older version?: issue#1)
• gRPC (Optional but increase performance)

Getting Started

Install Composer

composer require jag/laravel-broadcaster-google-pubsub

Add Service Provider

Since Laravel 5.5 Auto Discovery is enabled by default, but in case you disable or uses Lumen Framework, add the service provider:

On config/app.php

...
'providers' => [
    ...
    Jag\Broadcaster\GooglePubSub\Providers\LaravelPubSubServiceProvider::class,
]
...

If Lumen however, on your bootstrap/app.php

...
$app->register(Jag\Broadcaster\GooglePubSub\Providers\LaravelPubSubServiceProvider::class);
...

Configuration

In Laravel & Lumen

Make sure your BROADCAST_DRIVER is google

On your .env

...
BROADCAST_DRIVER=google
GOOGLE_PUBSUB_BROADCASTER_PROJECT_ID=insert-your-google-project-id-here
GOOGLE_PUBSUB_BROADCASTER_CREDENTIALS=path/to/your/key.json

In Lumen

In case you are using Lumen, you need to copy broadcasting configuration usually found at vendor/laravel/lumen-framework/config/broadcasting.php to your config/broadcasting.php, then add these configuration:

return [
    'default' => env('BROADCAST_DRIVER', 'null'),
    'connections' => [
        // Usually other connections here like pusher, redis, log & null by default
        'google' => [
            'driver' => 'google',
            'project_id' => env('GOOGLE_PUBSUB_BROADCASTER_PROJECT_ID', env('GOOGLE_PROJECT_ID', env('GCLOUD_PROJECT'))),
            'credentials_path' => env('GOOGLE_PUBSUB_BROADCASTER_CREDENTIALS', env('GOOGLE_APPLICATION_CREDENTIALS')),
            'auto_create_topic' => env('GOOGLE_PUBSUB_BROADCASTER_AUTO_CREATE_TOPIC', false),
            'override_config' => [],
        ]
    ],
];

You can also find these configuration at vendor/jag/laravel-broadcaster-google-pubsub/config/google.php

Configuration GOOGLE_PUBSUB_BROADCASTER_CREDENTIALS if null or not present, will automatically search for storage/key.json.

If you also add like this GOOGLE_PUBSUB_BROADCASTER_CREDENTIALS=storage/google-key.json in your .env, it will search for storage/google-key.json, just a magic use of Str::startsWith documentation.

You can enable auto creation of topic in auto_create_topic (boolean type, default false), BUT make sure your credentials have permission of Pub/Sub Viewer.

You can also override most of all PubSubClient related configuration on override_config EXCEPT projectId:

// broadcasting.php
return [
    ...
    'connections' => [
        'google' => [
            ...// Default configuration
            'override_config' => [
                'retries' => 5,
                'requestTimeout' => 120,
            ],
        ]
    ],
];

Usage

To use these in your Events, make sure to implement Illuminate\Contracts\Broadcasting\ShouldBroadcast and add the topic on broadcastOn().

// App\Events\NewlyCreatedProductEvent.php
...
class NewlyCreatedProductEvent implements ShouldBroadcast {
    ...
    public function broadcastOn()
    {
        return [
            'text-based-topic-name',
            new ProductChannel()
        ];   
    }   
}

On your channel, the topic name will be based on channel's name

// App\Broadcasting\ProductChannel
...
class ProductChanel extends Channel
{
    public function __construct()
    {
        parent::__construct('product-topic');    
    }
}

But you can also override this by $topic public property.

// App\Broadcasting\ProductChannel
...
class ProductChanel extends Channel
{
    // or the fully name topic eg. projects/project-id/topics/topic-id
    public $topic = 'override-topic-name';

    public function __construct()
    {
        parent::__construct('product-topic');    
    }
}

Created and Developed by Jay Are Galinada