varnish_akamai_cache_clear.module

<?php 
/*
This module is intended for clearing cache on demand for any URL. 
Jyothi K Reddy

*/


module_load_include('module', 'varnish');
module_load_include('module', 'akamai');

/**
 * Implements hook_menu().
 */
function varnish_akamai_cache_clear_menu() {

  $items['admin/config/varnish-akamai'] = array(
    'title' => 'Varnish/Akamai Cache Clear',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('varnish_akamai_cache_clear_cache_control'),
    'access arguments' => array('administer varnish/akamai'),
    
  );

  return $items;
}

/**
 * Implements hook_permission().
 */
function varnish_akamai_cache_clear_permission() {
  return array(
    'administer varnish/akamai' =>  array(
      'title' => t('Administer varnish/Akamai Cache control utility'),
      'description' => t('Perform varnish/Akamai cache clear functions'),
    ),
  );
}


function varnish_akamai_cache_clear_cache_control() {
  $form = array();

  $form['path'] = array(
    '#type'        => 'textfield',
    '#title'       => t('Path/URL'),
    '#description' => t('Enter the URL that you want to clear cache on. URL entries should be relative to the basepath. (e.g. node/1, content/pretty-title, sites/default/files/some/image.png'),
  );

  $form['domain_override'] = array(
    '#type'          => 'select',
    '#title'         => t('Akamai Domain'),
    '#default_value' => variable_get('akamai_domain', 'staging'),
    '#options'       => array(
      'staging'    => t('Staging'),
      'production' => t('Production'),
    ),
    '#description'   => t('The Akamai domain to use for cache clearing.  Defaults to the Domain setting from the settings page.')
  );

  $form['refresh'] = array(
    '#type'        => 'radios',
    '#title'       => t('Clearing Action Type'),
    '#default_value' => variable_get('akamai_action', ''),
    '#options'     => array(
      'remove'     => t('Remove'),
      'invalidate' => t('Invalidate'),
    ),
    '#description' => t('<b>Remove:</b> Purge the content from Akamai edge server caches. The next time the edge server receives a request for the content, it will retrieve the current version from the origin server. If it cannot retrieve a current version, it will follow instructions in your edge server configuration.<br/><br/><b>Invalidate:</b> Mark the cached content as invalid. The next time the Akamai edge server receives a request for the content, it will send an HTTP conditional get (If-Modified-Since) request to the origin. If the content has changed, the origin server will return a full fresh copy; otherwise, the origin normally will respond that the content has not changed, and Akamai can serve the already-cached content.<br/><br/><b>Note that <em>Remove</em> can increase the load on the origin more than <em>Invalidate</em>.</b> With <em>Invalidate</em>, objects are not removed from cache and full objects are not retrieved from the origin unless they are newer than the cached versions.'),
  );

  $form['submit'] = array(
    '#type'  => 'submit',
    '#value' => t('Clear Varnish/Akamai Cache'),
  );

  return $form;
}

/**
 * Implements hook_node_submit().
 */
function varnish_akamai_cache_clear_cache_control_submit($form, &$form_state) {

global $base_url;
//Determining the protocol on which the application runs.
if(!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
    $protocol = "https://";
    } 
else {
    $protocol = "http://";
  }
  //Removing the protocol for clearning varnish
$url_no_protocol = str_replace($protocol, '', $base_url);
$alias = filter_xss($form_state['values']['path']);
$path = drupal_lookup_path("source", $alias);

  if(!empty($path)) {
    
    $did_clear = akamai_clear_url($path);
    $version =  floatval(variable_get('varnish_version'));
    $command =  $version >= 3 ? "ban" : "purge";
    $result  =  _varnish_terminal_run(array("$command req.http.host ~ $url_no_protocol && req.url  ~ \"$path\""));
    $result  =  serialize($result);    

    if($result && $did_clear) {
          drupal_set_message("Cache cleared for '".$alias."' from system with node path as '".$path."'");
          drupal_set_message("Please allow 10 to 15 minutes for Akamai Cache to be cleared");
      }
    else{
          drupal_set_message("cache not cleared" ,'error');
        }

  }
        else{
          drupal_set_message('Please enter a valid URL', 'error');
        }
      
  }