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kniro avatar Drupal

How do I return an empty build array and log an error?

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kniro

I am using the following code for a block.

class WeatherBlock extends BlockBase implements ContainerFactoryPluginInterface {
  
  // Dependency injection code
  
  public function getCity() {
    $ip = '193.62.157.66';
    try {
      $response_ip = $this->httpClient->get('http://ip-api.com/json/' . $ip);
      $response_data_ip = $response_ip->getBody();
      $data_ip = json_decode($response_data_ip);
      if ($data_ip->status == 'success') {
        return $data_ip->city;
      }
      else {
        return $this->configFactory->get('sydneypro_weather.settings')->get('weather_city');
      }
    }
    catch (RequestException $e) {
      return FALSE;
    }
  }

  public function build() {
    $client = $this->httpClient;
    $api_key = $this->configFactory->get('sydneypro_weather.settings')->get('weather_api_key');
    $cid = 'sydneypro_weather';
    if (empty($api_key)) {
      return [
        '#type' => 'markup',
        '#markup' => $this->t('Please enter your API key in the Admin panel to see the weather'),
      ];
    }
    try {
      if ($cache = $this->cacheBackend->get($cid)) {
        $data = $cache->data;
      }
      else {
        $response = $client->get('http://api.openweathermap.org/data/2.5/weather?q=' . $this->getCity() . ',&appid=' . $api_key . '&units=metric');
        $response_data = $response->getBody();
        $data = json_decode($response_data);
        $this->cacheBackend->set($cid, $data, $this->time->getRequestTime() + 21600);
      }
      
      $build = [
        '#theme' => 'weather_block',
        '#data' => $data,
        '#attached' => [
          'library' => [
            'sydneypro_weather/sydneypro_weather',
          ],
        ],
      ];
      return $build;
    }

    catch (RequestException $e) {
      return [
        '#markup' => Markup::create('<h1>Sorry, no data available</h1>'),
      ];
    }
  }

}

The configuration is ignored using the Config ignore module; when I deploy the website to another environment, the module configuration (which is ignored) isn't created in the database during drush cim. When the configuration is missing, I need to return an empty build array and log an error.

I looked at several examples where the logger is called using \Drupal::logger(' ')->error(' ', []);. I don't understand how I could return an empty build array and log an error, and where to insert all this in the code.

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apaderno avatar
us flag
apaderno
Essentially, you don't know which parameter to pass to [`\Drupal::logger()`](https://api.drupal.org/api/drupal/core%21lib%21Drupal.php/function/Drupal%3A%3Alogger/9.3.x) and which parameters to pass to the [`error()`](https://api.drupal.org/api/drupal/vendor%21psr%21log%21Psr%21Log%21LoggerInterface.php/function/LoggerInterface%3A%3Aerror/9.3.x) method. What exactly don't you understand? Without a very specific question, we would just say what the documentation already says.
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apaderno avatar
us flag
apaderno
As for *I don't understand how I could return an empty build array and log an error*, you first call `Drupal::logger()->error()` with the right parameters and then return an empty array. This is how PHP works and not something Drupal-specific.
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