Async processing in php using redis

asyncprocessingphp

// Breakdown of the script
```bash
composer require predis/predis
```

1. **Update the configuration file (`config.php`):**

```php
<?php

return [
    'redis' => [
        'host' => 'localhost',
        'port' => 6379,
        'queue' => 'async_tasks',
    ],
];
```

2. **Sender script (`send_task.php`):**

```php
<?php

require_once __DIR__ . '/vendor/autoload.php';
$config = require_once __DIR__ . '/config.php';

use Predis\Client;

// Connect to Redis
$redis = new Client([
    'host' => $config['redis']['host'],
    'port' => $config['redis']['port'],
]);

// Create a sample task 
$task = [
    'type' => 'send_email',
    'data' => [
        'to' => 'recipient@example.com',
        'subject' => 'Hello!',
        'body' => 'This is the email body.',
    ],
];

// Convert the task to JSON
$messageBody = json_encode($task);

// Push the message to the Redis list
$redis->lpush($config['redis']['queue'], $messageBody);

echo " [x] Task sent: {$messageBody}\n";
```

3. **Worker script (`worker.php`):**

```php
<?php

require_once __DIR__ . '/vendor/autoload.php';
$config = require_once __DIR__ . '/config.php';

use Predis\Client;

// Connect to Redis
$redis = new Client([
    'host' => $config['redis']['host'],
    'port' => $config['redis']['port'],
]);

echo " [*] Waiting for messages. To exit, press CTRL+C\n";

while (true) {
    // Retrieve a task from the Redis list
    $messageBody = $redis->brpop($config['redis']['queue'], 0)[1];
    $task = json_decode($messageBody, true);

    // Simulate processing time
    sleep(5);

    // Process the task based on its type
    switch ($task['type']) {
        case 'send_email':
            // Example: Send an email
            sendEmail($task['data']);
            echo " [x] Email sent to {$task['data']['to']}\n";
            break;
        // Add more task types as needed

        default:
            echo " [x] Unknown task type\n";
    }
}

function sendEmail($data)
{
    //  Email sending logic goes here
    echo "Sending email to: {$data['to']}, Subject: {$data['subject']}, Body: {$data['body']}\n"; // for demo purposes
}
```

To test run the worker script and sender script in separate terminals

```bash
php worker.php
```

```bash
php send_task.php
```