function echo_requirements in Echo 7

Same name and namespace in other branches

1. 8 echo.install \echo_requirements()
2. 6 echo.install \echo_requirements()

Implements hook_requirements().

Since the Echo module relies on a working cache implementation, check whether a cache_set() followed immediately by a cache_get() retrieves what it stored.

File

./echo.install, line 14

Installation for Echo module.

Code

function echo_requirements($phase) {
  $title = 'Echo test';
  $uniqid = uniqid();
  $content = "<div id='{$uniqid}'>Hello, world!</div>";
  $theme = variable_get('theme_default', 'bartik');
  if ($phase == 'runtime') {

    // Disable libxml errors.
    libxml_use_internal_errors(true);

    // The echo_themed_page() function should be available at this point.
    $document = new DomDocument();
    $document
      ->loadHTML(echo_themed_page($title, $content, $theme));
    $xpath = new DOMXpath($document);
    $pass = $xpath
      ->query("//div[@id='{$uniqid}']");
  }
  else {
    $key = sha1($title . $content . $theme);

    // Thirty seconds ought to be enough for anyone.
    $expiration = REQUEST_TIME + max(ini_get('max_execution_time'), 30);
    cache_set($key, $key, 'cache', $expiration);
    sleep(1);
    $cached = cache_get($key);
    $pass = $cached->data === $key;
  }
  return array(
    'echo' => array(
      'title' => t('Cache system'),
      'description' => t('The <a href="!echo">%echo</a> module requires a working cache system.', array(
        '!echo' => 'http://drupal.org/project/echo',
        '%echo' => 'Echo',
      )),
      'value' => $pass ? t('Working') : t('Not working'),
      'severity' => $pass ? REQUIREMENT_OK : REQUIREMENT_ERROR,
    ),
  );
}