Remote Data Caching Engine

<?php /**

• Plugin Name: Remote Data Caching Engine
• Description: Demonstrates REST API integration with Transients API caching for enterprise scalability.
• Version: 1.0
• Author: Uttoorwar Meher Mani */

if ( ! defined( 'ABSPATH' ) ) exit; // Security: Prevent direct access

class RemoteDataEngine {

// Unique key for the cache to avoid collisions
private $cache_key = 'rt_enterprise_api_cache';

// Cache duration: 1 hour (3600 seconds)
private $cache_expiry = 3600;

public function __construct() {
    // Register shortcode: [api_data_ticker]
    add_shortcode( 'api_data_ticker', array( $this, 'render_data_view' ) );
}

/**
 * Logic: Fetches data from Remote API or returns cached version
 */
private function get_validated_data() {
    // 1. Check for cached version first (Transients API)
    $cached_response = get_transient( $this->cache_key );

    if ( false !== $cached_response ) {
        return $cached_response;
    }

    // 2. Fetch from External API (Example: Public Crypto Price API)
    $api_url  = 'https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd';
    $response = wp_remote_get( $api_url );

    // 3. Error Handling: Check for API failures
    if ( is_wp_error( $response ) ) {
        return false; 
    }

    $body = json_decode( wp_remote_retrieve_body( $response ), true );

    // 4. Save to Cache for 1 hour to prevent redundant server calls
    set_transient( $this->cache_key, $body, $this->cache_expiry );

    return $body;
}

/**
 * View: Renders the data securely in the frontend
 */
public function render_data_view() {
    $data = $this->get_validated_data();

    if ( ! $data ) {
        return '<p>Service temporarily unavailable. Please try again later.</p>';
    }

    $price = floatval( $data['bitcoin']['usd'] );

    ob_start(); // Output buffering for clean shortcode rendering
    ?>
    <div class="api-ticker-card" style="border-left: 5px solid #2271b1; background: #f6f7f7; padding: 15px; margin: 10px 0;">
        <h4 style="margin-top:0;">📊 Real-time Data Feed</h4>
        <p>Bitcoin (BTC/USD): <strong>$<?php echo esc_html( number_format( $price ) ); ?></strong></p>
        <small style="color: #646970;">Performance: This data is server-side cached for 60 minutes.</small>
    </div>
    <?php
    return ob_get_clean();
}

}

new RemoteDataEngine();