class EndOfTransactionQueriesTest

class EndOfTransactionQueriesTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'delay_cache_tags_invalidation',
        'entity_test',
        'system',
        'user',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installEntitySchema('entity_test');
        $this->installEntitySchema('user');
        // Ensure the cachetags table already exists.
        Cache::invalidateTags([
            $this->randomString(),
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function register(ContainerBuilder $container) : void {
        parent::register($container);
        $container->register('serializer', PhpSerialize::class);
        // Register a database cache backend rather than memory-based.
        $container->register('cache_factory', DatabaseBackendFactory::class)
            ->addArgument(new Reference('database'))
            ->addArgument(new Reference('cache_tags.invalidator.checksum'))
            ->addArgument(new Reference('settings'))
            ->addArgument(new Reference('serializer'))
            ->addArgument(new Reference(TimeInterface::class));
    }
    
    /**
     * Tests an entity save.
     */
    public function testEntitySave() : void {
        \Drupal::cache()->set('test_cache_pretransaction_foobar', 'something', Cache::PERMANENT, [
            'foobar',
        ]);
        \Drupal::cache()->set('test_cache_pretransaction_entity_test_list', 'something', Cache::PERMANENT, [
            'entity_test_list',
        ]);
        $entity = EntityTest::create([
            'name' => $this->randomString(),
        ]);
        Database::startLog('testEntitySave');
        $entity->save();
        $executed_statements = [];
        foreach (Database::getLog('testEntitySave') as $log) {
            // Exclude transaction related statements from the log.
            if (str_starts_with($log['query'], 'ROLLBACK TO SAVEPOINT ') || str_starts_with($log['query'], 'RELEASE SAVEPOINT ') || str_starts_with($log['query'], 'SAVEPOINT ')) {
                continue;
            }
            $executed_statements[] = $log['query'];
        }
        $last_statement_index = max(array_keys($executed_statements));
        $cachetag_statements = array_keys($this->getStatementsForTable($executed_statements, 'cachetags'));
        $this->assertSame($last_statement_index - count($cachetag_statements) + 1, min($cachetag_statements), 'All of the last queries in the transaction are for the "cachetags" table.');
        // Verify that a nested entity save occurred.
        $this->assertSame('john doe', User::load(1)->getAccountName());
        // Cache reads occurring during a transaction that DO NOT depend on
        // invalidated cache tags result in cache HITs. Similarly, cache writes that
        // DO NOT depend on invalidated cache tags DO get written. Of course, if we
        // read either one now, outside of the context of the transaction, we expect
        // the same.
        $this->assertNotEmpty(\Drupal::state()->get('delay_cache_tags_invalidation_entity_test_insert__pretransaction_foobar'));
        $this->assertNotEmpty(\Drupal::cache()->get('delay_cache_tags_invalidation_entity_test_insert__during_transaction_foobar'));
        $this->assertNotEmpty(\Drupal::state()->get('delay_cache_tags_invalidation_user_insert__during_transaction_foobar'));
        $this->assertNotEmpty(\Drupal::cache()->get('test_cache_pretransaction_foobar'));
        // Cache reads occurring during a transaction that DO depend on invalidated
        // cache tags result in cache MISSes. Similarly, cache writes that DO depend
        // on invalidated cache tags DO NOT get written. Of course, if we read
        // either one now, outside of the context of the transaction, we expect the
        // same.
        $this->assertFalse(\Drupal::state()->get('delay_cache_tags_invalidation_entity_test_insert__pretransaction_entity_test_list'));
        $this->assertFalse(\Drupal::cache()->get('delay_cache_tags_invalidation_entity_test_insert__during_transaction_entity_test_list'));
        $this->assertFalse(\Drupal::state()->get('delay_cache_tags_invalidation_user_insert__during_transaction_entity_test_list'));
        $this->assertFalse(\Drupal::cache()->get('test_cache_pretransaction_entity_test_list'));
    }
    
    /**
     * Tests an entity save rollback.
     */
    public function testEntitySaveRollback() : void {
        \Drupal::cache()->set('test_cache_pretransaction_entity_test_list', 'something', Cache::PERMANENT, [
            'entity_test_list',
        ]);
        \Drupal::cache()->set('test_cache_pretransaction_user_list', 'something', Cache::PERMANENT, [
            'user_list',
        ]);
        \Drupal::state()->set('delay_cache_tags_invalidation_exception', TRUE);
        try {
            EntityTest::create([
                'name' => $this->randomString(),
            ])
                ->save();
            $this->fail('Exception not thrown');
        } catch (\Exception $e) {
            $this->assertEquals('Abort entity save to trigger transaction rollback.', $e->getMessage());
        }
        // The cache has not been invalidated.
        $this->assertNotEmpty(\Drupal::cache()->get('test_cache_pretransaction_entity_test_list'));
        $this->assertNotEmpty(\Drupal::cache()->get('test_cache_pretransaction_user_list'));
        // Save a user, that should invalidate the cache tagged with user_list but
        // not the one with entity_test_list.
        User::create([
            'name' => 'john doe',
            'status' => 1,
        ])->save();
        $this->assertNotEmpty(\Drupal::cache()->get('test_cache_pretransaction_entity_test_list'));
        $this->assertFalse(\Drupal::cache()->get('test_cache_pretransaction_user_list'));
    }
    
    /**
     * Filters statements by table name.
     *
     * @param string[] $statements
     *   A list of query statements.
     * @param string $table_name
     *   The name of the table to filter by.
     *
     * @return string[]
     *   Filtered statement list.
     */
    protected function getStatementsForTable(array $statements, $table_name) : array {
        return array_filter($statements, function ($statement) use ($table_name) {
            return $this->isStatementRelatedToTable($statement, $table_name);
        });
    }
    
    /**
     * Determines if a statement is relative to a specified table.
     *
     * Non-core database drivers can override this method if they have different
     * patterns to identify table related statements.
     *
     * @param string $statement
     *   The query statement.
     * @param string $tableName
     *   The table name, Drupal style, without curly brackets or prefix.
     *
     * @return bool
     *   TRUE if the statement is relative to the table, FALSE otherwise.
     */
    protected static function isStatementRelatedToTable(string $statement, string $tableName) : bool {
        $realTableIdentifier = Database::getConnection()->prefixTables('{' . $tableName . '}');
        $pattern = '/.*(INTO|FROM|UPDATE)( |\\n)' . preg_quote($realTableIdentifier, '/') . '/';
        return preg_match($pattern, $statement) === 1 ? TRUE : FALSE;
    }

}