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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2018, British Columbia Institute of Technology * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/) * @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/) * @license http://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 3.0.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * Migration Class * * All migrations should implement this, forces up() and down() and gives * access to the CI super-global. * * @package CodeIgniter * @subpackage Libraries * @category Libraries * @author Reactor Engineers * @link */ class CI_Migration { /** * Whether the library is enabled * * @var bool */ protected $_migration_enabled = FALSE; /** * Migration numbering type * * @var bool */ protected $_migration_type = 'sequential'; /** * Path to migration classes * * @var string */ protected $_migration_path = NULL; /** * Current migration version * * @var mixed */ protected $_migration_version = 0; /** * Database table with migration info * * @var string */ protected $_migration_table = 'migrations'; /** * Whether to automatically run migrations * * @var bool */ protected $_migration_auto_latest = FALSE; /** * Migration basename regex * * @var string */ protected $_migration_regex; /** * Error message * * @var string */ protected $_error_string = ''; /** * Initialize Migration Class * * @param array $config * @return void */ public function __construct($config = array()) { // Only run this constructor on main library load if ( ! in_array(get_class($this), array('CI_Migration', config_item('subclass_prefix').'Migration'), TRUE)) { return; } foreach ($config as $key => $val) { $this->{'_'.$key} = $val; } log_message('info', 'Migrations Class Initialized'); // Are they trying to use migrations while it is disabled? if ($this->_migration_enabled !== TRUE) { show_error('Migrations has been loaded but is disabled or set up incorrectly.'); } // If not set, set it $this->_migration_path !== '' OR $this->_migration_path = APPPATH.'migrations/'; // Add trailing slash if not set $this->_migration_path = rtrim($this->_migration_path, '/').'/'; // Load migration language $this->lang->load('migration'); // They'll probably be using dbforge $this->load->dbforge(); // Make sure the migration table name was set. if (empty($this->_migration_table)) { show_error('Migrations configuration file (migration.php) must have "migration_table" set.'); } // Migration basename regex $this->_migration_regex = ($this->_migration_type === 'timestamp') ? '/^\d{14}_(\w+)$/' : '/^\d{3}_(\w+)$/'; // Make sure a valid migration numbering type was set. if ( ! in_array($this->_migration_type, array('sequential', 'timestamp'))) { show_error('An invalid migration numbering type was specified: '.$this->_migration_type); } // If the migrations table is missing, make it if ( ! $this->db->table_exists($this->_migration_table)) { $this->dbforge->add_field(array( 'version' => array('type' => 'BIGINT', 'constraint' => 20), )); $this->dbforge->create_table($this->_migration_table, TRUE); $this->db->insert($this->_migration_table, array('version' => 0)); } // Do we auto migrate to the latest migration? if ($this->_migration_auto_latest === TRUE && ! $this->latest()) { show_error($this->error_string()); } } // -------------------------------------------------------------------- /** * Migrate to a schema version * * Calls each migration step required to get to the schema version of * choice * * @param string $target_version Target schema version * @return mixed TRUE if no migrations are found, current version string on success, FALSE on failure */ public function version($target_version) { // Note: We use strings, so that timestamp versions work on 32-bit systems $current_version = $this->_get_version(); if ($this->_migration_type === 'sequential') { $target_version = sprintf('%03d', $target_version); } else { $target_version = (string) $target_version; } $migrations = $this->find_migrations(); if ($target_version > 0 && ! isset($migrations[$target_version])) { $this->_error_string = sprintf($this->lang->line('migration_not_found'), $target_version); return FALSE; } if ($target_version > $current_version) { $method = 'up'; } elseif ($target_version < $current_version) { $method = 'down'; // We need this so that migrations are applied in reverse order krsort($migrations); } else { // Well, there's nothing to migrate then ... return TRUE; } // Validate all available migrations within our target range. // // Unfortunately, we'll have to use another loop to run them // in order to avoid leaving the procedure in a broken state. // // See https://github.com/bcit-ci/CodeIgniter/issues/4539 $pending = array(); foreach ($migrations as $number => $file) { // Ignore versions out of our range. // // Because we've previously sorted the $migrations array depending on the direction, // we can safely break the loop once we reach $target_version ... if ($method === 'up') { if ($number <= $current_version) { continue; } elseif ($number > $target_version) { break; } } else { if ($number > $current_version) { continue; } elseif ($number <= $target_version) { break; } } // Check for sequence gaps if ($this->_migration_type === 'sequential') { if (isset($previous) && abs($number - $previous) > 1) { $this->_error_string = sprintf($this->lang->line('migration_sequence_gap'), $number); return FALSE; } $previous = $number; } include_once($file); $class = 'Migration_'.ucfirst(strtolower($this->_get_migration_name(basename($file, '.php')))); // Validate the migration file structure if ( ! class_exists($class, FALSE)) { $this->_error_string = sprintf($this->lang->line('migration_class_doesnt_exist'), $class); return FALSE; } elseif ( ! is_callable(array($class, $method))) { $this->_error_string = sprintf($this->lang->line('migration_missing_'.$method.'_method'), $class); return FALSE; } $pending[$number] = array($class, $method); } // Now just run the necessary migrations foreach ($pending as $number => $migration) { log_message('debug', 'Migrating '.$method.' from version '.$current_version.' to version '.$number); $migration[0] = new $migration[0]; call_user_func($migration); $current_version = $number; $this->_update_version($current_version); } // This is necessary when moving down, since the the last migration applied // will be the down() method for the next migration up from the target if ($current_version <> $target_version) { $current_version = $target_version; $this->_update_version($current_version); } log_message('debug', 'Finished migrating to '.$current_version); return $current_version; } // -------------------------------------------------------------------- /** * Sets the schema to the latest migration * * @return mixed Current version string on success, FALSE on failure */ public function latest() { $migrations = $this->find_migrations(); if (empty($migrations)) { $this->_error_string = $this->lang->line('migration_none_found'); return FALSE; } $last_migration = basename(end($migrations)); // Calculate the last migration step from existing migration // filenames and proceed to the standard version migration return $this->version($this->_get_migration_number($last_migration)); } // -------------------------------------------------------------------- /** * Sets the schema to the migration version set in config * * @return mixed TRUE if no migrations are found, current version string on success, FALSE on failure */ public function current() { return $this->version($this->_migration_version); } // -------------------------------------------------------------------- /** * Error string * * @return string Error message returned as a string */ public function error_string() { return $this->_error_string; } // -------------------------------------------------------------------- /** * Retrieves list of available migration scripts * * @return array list of migration file paths sorted by version */ public function find_migrations() { $migrations = array(); // Load all *_*.php files in the migrations path foreach (glob($this->_migration_path.'*_*.php') as $file) { $name = basename($file, '.php'); // Filter out non-migration files if (preg_match($this->_migration_regex, $name)) { $number = $this->_get_migration_number($name); // There cannot be duplicate migration numbers if (isset($migrations[$number])) { $this->_error_string = sprintf($this->lang->line('migration_multiple_version'), $number); show_error($this->_error_string); } $migrations[$number] = $file; } } ksort($migrations); return $migrations; } // -------------------------------------------------------------------- /** * Extracts the migration number from a filename * * @param string $migration * @return string Numeric portion of a migration filename */ protected function _get_migration_number($migration) { return sscanf($migration, '%[0-9]+', $number) ? $number : '0'; } // -------------------------------------------------------------------- /** * Extracts the migration class name from a filename * * @param string $migration * @return string text portion of a migration filename */ protected function _get_migration_name($migration) { $parts = explode('_', $migration); array_shift($parts); return implode('_', $parts); } // -------------------------------------------------------------------- /** * Retrieves current schema version * * @return string Current migration version */ protected function _get_version() { $row = $this->db->select('version')->get($this->_migration_table)->row(); return $row ? $row->version : '0'; } // -------------------------------------------------------------------- /** * Stores the current schema version * * @param string $migration Migration reached * @return void */ protected function _update_version($migration) { $this->db->update($this->_migration_table, array( 'version' => $migration )); } // -------------------------------------------------------------------- /** * Enable the use of CI super-global * * @param string $var * @return mixed */ public function __get($var) { return get_instance()->$var; } }