CodeIgniter middleware: Accelerate page caching and static processing of applications

CodeIgniter middleware: Accelerate page caching and static processing of applications

Introduction:
When developing applications, improving web page loading speed is an important consideration. Page caching and static processing are effective means to achieve this goal. The CodeIgniter framework provides middleware functions that can easily implement page caching and static processing, thereby accelerating the loading speed of applications.

1. Page caching

Page caching caches dynamically generated web page content on the server and directly returns the cached content in subsequent requests, avoiding the cost of regenerating the page. The CodeIgniter framework provides a built-in page caching class, and we can easily implement the page caching function through middleware.

1.1 Configuration file settings cache path
First, we need to set the cache path in the configuration file. Open the config/config.php file and find the following code:

$config['cache_path'] = '';

Set $config['cache_path'] to the cache path, for example:

$config['cache_path'] = APPPATH . 'cache/';

1.2 Create the CacheMiddleware class
Next, we create a class named CacheMiddleware to implement the page caching function. Open the app/Middleware directory, create a file named CacheMiddleware.php, and copy the following code into the file:

<?php
defined('BASEPATH') or exit('No direct script access allowed');

class CacheMiddleware
{
    protected $CI;
    
    public function __construct()
    {
        $this->CI =& get_instance();
    }
    
    public function handle()
    {
        if ($this->CI->input->server('REQUEST_METHOD') == 'GET')
        {
            $this->CI->load->driver('cache', array('adapter' => 'file'));
            
            $cache_key = md5(uri_string());
            if ($this->CI->cache->get($cache_key))
            {
                echo $this->CI->cache->get($cache_key);
                exit();
            }
            else
            {
                ob_start();
            }
        }
    }
    
    public function terminate()
    {
        if ($this->CI->input->server('REQUEST_METHOD') == 'GET')
        {
            $output = ob_get_contents();
            ob_end_flush();
            
            $cache_key = md5(uri_string());
            $this->CI->cache->save($cache_key, $output, 3600);
        }
    }
}

1.3 Register Middleware
Then, open the app/Config/App.php file and find the following code:

public $middleware = [];

Add an element to the $middleware array and CacheMiddleware Add the class to the array:

public $middleware = [
    AppMiddlewareCacheMiddleware::class
];

1.4 Test page cache
Now, we have configured the page cache. Open your app, visit a page in your browser, and refresh the page. You will find that the page loading speed increases significantly on the second refresh because the page content is cached.

2. Static processing

Static processing saves the dynamically generated web page content as a static HTML file and returns it directly to the user, eliminating the need for dynamic generation. The CodeIgniter framework provides related functions to achieve static processing.

2.1 Create the StaticMiddleware class
Next, we create a class named StaticMiddleware to implement static processing of the page. Open the app/Middleware directory, create a file named StaticMiddleware.php, and copy the following code into the file:

<?php
defined('BASEPATH') or exit('No direct script access allowed');

class StaticMiddleware
{
    protected $CI;
    
    public function __construct()
    {
        $this->CI =& get_instance();
    }
    
    public function handle()
    {
        if ($this->CI->input->server('REQUEST_METHOD') == 'GET')
        {
            $file_path = APPPATH . 'static/' . uri_string() . '.html';
            if (file_exists($file_path))
            {
                echo file_get_contents($file_path);
                exit();
            }
            else
            {
                ob_start();
            }
        }
    }
    
    public function terminate()
    {
        if ($this->CI->input->server('REQUEST_METHOD') == 'GET')
        {
            $output = ob_get_contents();
            ob_end_flush();
            
            $file_path = APPPATH . 'static/' . uri_string() . '.html';
            file_put_contents($file_path, $output);
        }
    }
}

2.2 Register Middleware
Then, open the app/Config/App.php file and find the following code:

public $middleware = [];

Add an element to the $middleware array and StaticMiddleware Add the class to the array:

public $middleware = [
    AppMiddlewareStaticMiddleware::class
];

2.3 Test static processing
Now, we have configured static processing. Open your app, visit a page in your browser, and refresh the page. You will find that an HTML file named with the current URL is saved in the app/static/ directory. The page content will be loaded directly from the HTML file, and the loading speed is faster than dynamically generated pages.

Conclusion:
Implementing page caching and static processing through middleware can significantly improve the loading speed of the application. In the CodeIgniter framework, we only need to implement the middleware class and register it in the application to easily implement these functions. When using middleware functions, we need to consider the appropriate cache time and cache path in order to obtain the best performance improvement.

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