function ConnectionFailureTest::testConnectionFailureLogging

Tests logging of connection failures.

File

core/modules/dblog/tests/src/Kernel/ConnectionFailureTest.php, line 25

Class

ConnectionFailureTest

Tests logging of connection failures.

Namespace

Code

public function testConnectionFailureLogging() : void {
  $this->installSchema('dblog', [
    'watchdog',
  ]);
  // MySQL errors like "1153 - Got a packet bigger than 'max_allowed_packet'
  // bytes" or "1100 - Table 'xyz' was not locked with LOCK TABLES" lead to a
  // database connection unusable for further requests. All further request
  // will result in a "2006 - MySQL server had gone away" error. As a
  // consequence it's impossible to use this connection to log the causing
  // initial error itself. Using Database::closeConnection() we simulate such
  // a corrupted connection. In this case dblog has to establish a different
  // connection by itself to be able to write the log entry.
  Database::closeConnection();
  // Create a log entry.
  $this->container
    ->get('logger.factory')
    ->get('php')
    ->error('testConnectionFailureLogging');
  // Re-establish the default database connection.
  $database = Database::getConnection();
  $query = $database->select('watchdog')
    ->condition('message', 'testConnectionFailureLogging');
  $query->addExpression('MAX([wid])');
  $wid = $query->execute()
    ->fetchField();
  $this->assertNotEmpty($wid, 'Watchdog entry has been stored in database.');
}