Issue #3520890 by dww, nicxvan, larowlan: Reduce pgsql requirements duplication

namespace Drupal\pgsql\Hook;

use Drupal\Core\Database\Database;

use Drupal\Core\Extension\Requirement\RequirementSeverity;

use Drupal\Core\StringTranslation\StringTranslationTrait;

use Drupal\Core\Hook\Attribute\Hook;

use Drupal\pgsql\Install\Requirements\PgsqlRequirements;

/**

 * Hook implementations for pgsql module.

 */

class PgsqlRequirementsHooks {

  use StringTranslationTrait;

  /**

   * Implements hook_update_requirements().

   *

  #[Hook('update_requirements')]

  #[Hook('runtime_requirements')]

  public function checkRequirements(): array {

    $requirements = [];

    // Test with PostgreSQL databases for the status of the pg_trgm extension.

    if (Database::isActiveConnection()) {

      $connection = Database::getConnection();

      // Set the requirement just for postgres.

      if ($connection->driver() == 'pgsql') {

        $requirements['pgsql_extension_pg_trgm'] = [

          'severity' => RequirementSeverity::OK,

          'title' => $this->t('PostgreSQL pg_trgm extension'),

          'value' => $this->t('Available'),

          'description' => $this->t('The pg_trgm PostgreSQL extension is present.'),

        ];

        // If the extension is not available, set the requirement error.

        if (!$connection->schema()->extensionExists('pg_trgm')) {

          $requirements['pgsql_extension_pg_trgm']['severity'] = RequirementSeverity::Error;

          $requirements['pgsql_extension_pg_trgm']['value'] = $this->t('Not created');

          $requirements['pgsql_extension_pg_trgm']['description'] = $this->t('The <a href=":pg_trgm">pg_trgm</a> PostgreSQL extension is not present. The extension is required by Drupal to improve performance when using PostgreSQL. See <a href=":requirements">Drupal database server requirements</a> for more information.', [

            ':pg_trgm' => 'https://www.postgresql.org/docs/current/pgtrgm.html',

            ':requirements' => 'https://www.drupal.org/docs/system-requirements/database-server-requirements',

          ]);

        }

      }

    }

    return $requirements;

    // We want the identical check from the install time requirements.

    return PgsqlRequirements::getRequirements();

  }

}