class UncaughtExceptionTest

class UncaughtExceptionTest extends BrowserTestBase {
    
    /**
     * Exceptions thrown by site under test that contain this text are ignored.
     *
     * @var string
     */
    protected $expectedExceptionMessage;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'error_service_test',
        'error_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $settings_filename = $this->siteDirectory . '/settings.php';
        chmod($settings_filename, 0777);
        $settings_php = file_get_contents($settings_filename);
        $settings_php .= "\ninclude_once 'core/tests/Drupal/FunctionalTests/Bootstrap/ErrorContainer.php';\n";
        $settings_php .= "\ninclude_once 'core/tests/Drupal/FunctionalTests/Bootstrap/ExceptionContainer.php';\n";
        // Ensure we can test errors rather than being caught in
        // \Drupal\Core\Test\HttpClientMiddleware\TestHttpClientMiddleware.
        $settings_php .= "\ndefine('SIMPLETEST_COLLECT_ERRORS', FALSE);\n";
        file_put_contents($settings_filename, $settings_php);
        $settings = [];
        $settings['config']['system.logging']['error_level'] = (object) [
            'value' => ERROR_REPORTING_DISPLAY_VERBOSE,
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
    }
    
    /**
     * Tests uncaught exception handling when system is in a bad state.
     */
    public function testUncaughtException() : void {
        $this->expectedExceptionMessage = 'Oh oh, bananas in the instruments.';
        \Drupal::state()->set('error_service_test.break_bare_html_renderer', TRUE);
        $settings = [];
        $settings['config']['system.logging']['error_level'] = (object) [
            'value' => ERROR_REPORTING_HIDE,
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
        $this->drupalGet('');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertSession()
            ->pageTextContains('The website encountered an unexpected error. Try again later.');
        $this->assertSession()
            ->pageTextNotContains($this->expectedExceptionMessage);
        $settings = [];
        $settings['config']['system.logging']['error_level'] = (object) [
            'value' => ERROR_REPORTING_DISPLAY_ALL,
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
        $this->drupalGet('');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertSession()
            ->pageTextContains('The website encountered an unexpected error. Try again later.');
        $this->assertSession()
            ->pageTextContains($this->expectedExceptionMessage);
        $this->assertErrorLogged($this->expectedExceptionMessage);
    }
    
    /**
     * Tests displaying an uncaught fatal error.
     */
    public function testUncaughtFatalError() : void {
        $fatal_error = [
            '%type' => 'TypeError',
            '@message' => 'Drupal\\error_test\\Controller\\ErrorTestController::Drupal\\error_test\\Controller\\{closure}(): Argument #1 ($test) must be of type array, string given, called in ' . \Drupal::root() . '/core/modules/system/tests/modules/error_test/src/Controller/ErrorTestController.php on line 67',
            '%function' => 'Drupal\\error_test\\Controller\\ErrorTestController->Drupal\\error_test\\Controller\\{closure}()',
        ];
        $this->drupalGet('error-test/generate-fatal-errors');
        $this->assertSession()
            ->statusCodeEquals(500);
        $message = new FormattableMarkup('%type: @message in %function (line ', $fatal_error);
        $this->assertSession()
            ->responseContains((string) $message);
        $this->assertSession()
            ->responseContains('<pre class="backtrace">');
        // Ensure we are escaping but not double escaping.
        $this->assertSession()
            ->responseContains('&gt;');
        $this->assertSession()
            ->responseNotContains('&amp;gt;');
    }
    
    /**
     * Tests uncaught exception handling with custom exception handler.
     */
    public function testUncaughtExceptionCustomExceptionHandler() : void {
        $settings_filename = $this->siteDirectory . '/settings.php';
        chmod($settings_filename, 0777);
        $settings_php = file_get_contents($settings_filename);
        $settings_php .= "\n";
        $settings_php .= "set_exception_handler(function() {\n";
        $settings_php .= "  header('HTTP/1.1 418 I\\'m a teapot');\n";
        $settings_php .= "  print('Oh oh, flying teapots');\n";
        $settings_php .= "});\n";
        file_put_contents($settings_filename, $settings_php);
        \Drupal::state()->set('error_service_test.break_bare_html_renderer', TRUE);
        $this->drupalGet('');
        $this->assertSession()
            ->statusCodeEquals(418);
        $this->assertSession()
            ->pageTextNotContains('The website encountered an unexpected error. Try again later.');
        $this->assertSession()
            ->pageTextNotContains('Oh oh, bananas in the instruments');
        $this->assertSession()
            ->pageTextContains('Oh oh, flying teapots');
    }
    
    /**
     * Tests a missing dependency on a service.
     */
    public function testMissingDependency() : void {
        $this->expectedExceptionMessage = 'Too few arguments to function Drupal\\error_service_test\\LonelyMonkeyClass::__construct(), 0 passed';
        $this->drupalGet('broken-service-class');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertSession()
            ->pageTextContains('The website encountered an unexpected error.');
        $this->assertSession()
            ->pageTextContains($this->expectedExceptionMessage);
        $this->assertErrorLogged($this->expectedExceptionMessage);
    }
    
    /**
     * Tests a container which has an error.
     */
    public function testErrorContainer() : void {
        $settings = [];
        $settings['settings']['container_base_class'] = (object) [
            'value' => '\\Drupal\\FunctionalTests\\Bootstrap\\ErrorContainer',
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
        \Drupal::service('kernel')->invalidateContainer();
        $this->expectedExceptionMessage = 'Drupal\\FunctionalTests\\Bootstrap\\ErrorContainer::Drupal\\FunctionalTests\\Bootstrap\\{closure}(): Argument #1 ($container) must be of type Drupal\\FunctionalTests\\Bootstrap\\ErrorContainer';
        $this->drupalGet('');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertSession()
            ->pageTextContains($this->expectedExceptionMessage);
        $this->assertErrorLogged($this->expectedExceptionMessage);
    }
    
    /**
     * Tests a container which has an exception really early.
     */
    public function testExceptionContainer() : void {
        $settings = [];
        $settings['settings']['container_base_class'] = (object) [
            'value' => '\\Drupal\\FunctionalTests\\Bootstrap\\ExceptionContainer',
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
        \Drupal::service('kernel')->invalidateContainer();
        $this->expectedExceptionMessage = 'Thrown exception during Container::get';
        $this->drupalGet('');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertSession()
            ->pageTextContains('The website encountered an unexpected error');
        $this->assertSession()
            ->pageTextContains($this->expectedExceptionMessage);
        $this->assertErrorLogged($this->expectedExceptionMessage);
    }
    
    /**
     * Tests the case when the database connection is gone.
     */
    public function testLostDatabaseConnection() : void {
        $incorrect_username = $this->randomMachineName(16);
        switch ($this->container
            ->get('database')
            ->driver()) {
            case 'pgsql':
            case 'mysql':
                $this->expectedExceptionMessage = $incorrect_username;
                break;
            default:
                // We can not carry out this test.
                $this->markTestSkipped('Unable to run \\Drupal\\system\\Tests\\System\\UncaughtExceptionTest::testLostDatabaseConnection for this database type.');
        }
        // We simulate a broken database connection by rewrite settings.php to no
        // longer have the proper data.
        $settings['databases']['default']['default']['username'] = (object) [
            'value' => $incorrect_username,
            'required' => TRUE,
        ];
        $settings['databases']['default']['default']['password'] = (object) [
            'value' => $this->randomMachineName(16),
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
        $this->drupalGet('');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertSession()
            ->pageTextContains('DatabaseAccessDeniedException');
        $this->assertErrorLogged($this->expectedExceptionMessage);
    }
    
    /**
     * Tests fallback to PHP error log when an exception is thrown while logging.
     */
    public function testLoggerException() : void {
        // Ensure the test error log is empty before these tests.
        $this->assertNoErrorsLogged();
        $this->expectedExceptionMessage = 'Deforestation';
        \Drupal::state()->set('error_service_test.break_logger', TRUE);
        $this->drupalGet('');
        $this->assertSession()
            ->statusCodeEquals(500);
        $this->assertSession()
            ->pageTextContains('The website encountered an unexpected error. Try again later.');
        $this->assertSession()
            ->pageTextContains($this->expectedExceptionMessage);
        // Find fatal error logged to the error.log
        $errors = file(\Drupal::root() . '/' . $this->siteDirectory . '/error.log');
        $this->assertCount(10, $errors, 'The error + the error that the logging service is broken has been written to the error log.');
        $this->assertStringContainsString('Failed to log error', $errors[0], 'The error handling logs when an error could not be logged to the logger.');
        $expected_path = \Drupal::root() . '/core/modules/system/tests/modules/error_service_test/src/MonkeysInTheControlRoom.php';
        $expected_line = 69;
        $expected_entry = "Failed to log error: Exception: Deforestation in Drupal\\error_service_test\\MonkeysInTheControlRoom->handle() (line {$expected_line} of {$expected_path})";
        $this->assertStringContainsString($expected_entry, $errors[0], 'Original error logged to the PHP error log when an exception is thrown by a logger');
        // The exception is expected. Do not interpret it as a test failure. Not
        // using File API; a potential error must trigger a PHP warning.
        unlink(\Drupal::root() . '/' . $this->siteDirectory . '/error.log');
    }
    
    /**
     * Asserts that a specific error has been logged to the PHP error log.
     *
     * @param string $error_message
     *   The expected error message.
     *
     * @see \Drupal\Core\Test\FunctionalTestSetupTrait::prepareEnvironment()
     * @see \Drupal\Core\DrupalKernel::bootConfiguration()
     *
     * @internal
     */
    protected function assertErrorLogged(string $error_message) : void {
        $error_log_filename = DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log';
        $this->assertFileExists($error_log_filename);
        $content = file_get_contents($error_log_filename);
        $rows = explode(PHP_EOL, $content);
        // We iterate over the rows in order to be able to remove the logged error
        // afterwards.
        $found = FALSE;
        foreach ($rows as $row_index => $row) {
            if (str_contains($content, $error_message)) {
                $found = TRUE;
                unset($rows[$row_index]);
            }
        }
        file_put_contents($error_log_filename, implode("\n", $rows));
        $this->assertTrue($found, sprintf('The %s error message was logged.', $error_message));
    }
    
    /**
     * Asserts that no errors have been logged to the PHP error.log thus far.
     *
     * @see \Drupal\Core\Test\FunctionalTestSetupTrait::prepareEnvironment()
     * @see \Drupal\Core\DrupalKernel::bootConfiguration()
     *
     * @internal
     */
    protected function assertNoErrorsLogged() : void {
        // Since PHP only creates the error.log file when an actual error is
        // triggered, it is sufficient to check whether the file exists.
        $this->assertFileDoesNotExist(DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log');
    }

}