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Nathan Adams
362
pluf/src/Pluf/Migration.php
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362
pluf/src/Pluf/Migration.php
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<?php
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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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# ***** BEGIN LICENSE BLOCK *****
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# This file is part of Plume Framework, a simple PHP Application Framework.
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# Copyright (C) 2001-2007 Loic d'Anterroches and contributors.
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#
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# Plume Framework is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# Plume Framework is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# ***** END LICENSE BLOCK ***** */
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/**
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* A class to manage the migration of the code from one version to
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* another, upward or downward.
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*
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* You can directly use the migrate.php script.
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*
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* Simple example usage:
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*
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* <pre>
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* $m = new Pluf_Migration('MyApp');
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* $m->migrate();
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*
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* // Install the application MyApp
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* $m = new Pluf_Migration('MyApp');
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* $m->install();
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* // Uninstall the application MyApp
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* $m->unInstall();
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*
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* $m = new Pluf_Migration();
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* $m->migrate(); // migrate all the installed app to the newest version.
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*
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* $m = new Pluf_Migration();
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* $m->migrate(3); // migrate (upgrade or downgrade) to version 3
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* </pre>
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*
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*/
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class Pluf_Migration
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{
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protected $app = ''; /**< Application beeing migrated. */
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public $apps = array(); /**< Applications which are going to be migrated. */
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public $to_version = null; /**< Target version for the migration. */
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public $dry_run = false; /**< Set to true to not act. */
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public $display = false; /**< Display on the console what is done. */
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/**
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* Create a new migration.
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*
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* @param mixed Application or array of applications to migrate.
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*/
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public function __construct($app=null)
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{
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if (!is_null($app)) {
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if (is_array($app)) {
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$this->apps = $app;
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} else {
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$this->apps = array($app);
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}
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} else {
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$this->apps = Pluf::f('installed_apps');
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}
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}
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/**
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* Install the application.
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*
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* Basically run the base install function for each application
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* and then set the version to the latest migration.
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*/
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public function install()
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{
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foreach ($this->apps as $app) {
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$this->installApp($app);
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}
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return true;
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}
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/**
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* Uninstall the application.
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*/
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public function unInstall()
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{
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$apps = array_reverse($this->apps);
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foreach ($apps as $app) {
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$this->installApp($app, true);
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}
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}
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/**
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* Backup the application.
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*
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* @param string Path to the backup folder
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* @param string Backup name (null)
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*/
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public function backup($path, $name=null)
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{
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foreach ($this->apps as $app) {
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$func = $app.'_Migrations_Backup_run';
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Pluf::loadFunction($func);
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if ($this->display) {
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echo($func."\n");
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}
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if (!$this->dry_run) {
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$ret = $func($path, $name);
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}
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}
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return true;
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}
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/**
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* Restore the application.
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*
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* @param string Path to the backup folder
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* @param string Backup name
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*/
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public function restore($path, $name)
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{
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foreach ($this->apps as $app) {
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$func = $app.'_Migrations_Backup_restore';
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Pluf::loadFunction($func);
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if ($this->display) {
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echo($func."\n");
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}
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if (!$this->dry_run) {
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$ret = $func($path, $name);
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}
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}
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return true;
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}
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/**
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* Run the migration.
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*
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*/
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public function migrate($to_version=null)
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{
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$this->to_version = $to_version;
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foreach ($this->apps as $app) {
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$this->app = $app;
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$migrations = $this->findMigrations();
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// The run will throw an exception in case of error.
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$this->runMigrations($migrations);
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}
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return true;
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}
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/**
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* Un/Install the given application.
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*
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* @param string Application to install.
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* @param bool Uninstall (false)
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*/
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public function installApp($app, $uninstall=false)
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{
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if ($uninstall) {
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$func = $app.'_Migrations_Install_teardown';
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} else {
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$func = $app.'_Migrations_Install_setup';
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}
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$ret = true;
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Pluf::loadFunction($func);
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if ($this->display) {
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echo($func."\n");
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}
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if (!$this->dry_run) {
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$ret = $func(); // Run the install/uninstall
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if (!$uninstall) {
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//
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$this->app = $app;
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$migrations = $this->findMigrations();
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if (count($migrations) > 0) {
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$to_version = max(array_keys($migrations));
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} else {
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$to_version = 0;
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}
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$this->setAppVersion($app, $to_version);
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} else {
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if ($app != 'Pluf') {
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// If Pluf we do not have the schema info table
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// anymore
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$this->delAppInfo($app);
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}
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}
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}
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return $ret;
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}
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/**
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* Find the migrations for the current app.
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*
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* @return array Migrations names indexed by order.
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*/
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public function findMigrations()
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{
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$migrations = array();
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if (false !== ($mdir = Pluf::fileExists($this->app.'/Migrations'))) {
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$dir = new DirectoryIterator($mdir);
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foreach($dir as $file) {
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$matches = array();
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if (!$file->isDot() && !$file->isDir()
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&& preg_match('#^(\d+)#', $file->getFilename(), $matches)) {
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$info = pathinfo($file->getFilename());
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$migrations[(int)$matches[1]] = $info['filename'];
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}
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}
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}
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return $migrations;
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}
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/**
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* Run the migrations.
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*
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* From an array of possible migrations, it will first get the
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* current version of the app and then based on $this->to_version
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* will run the migrations in the right order or do nothing if
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* nothing to be done.
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*
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* @param array Possible migrations.
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*/
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public function runMigrations($migrations)
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{
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if (empty($migrations)) {
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return;
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}
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$current = $this->getAppVersion($this->app);
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if ($this->to_version === null) {
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$to_version = max(array_keys($migrations));
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} else {
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$to_version = $this->to_version;
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}
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if ($to_version == $current) {
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return; // Nothing to do
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}
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$the_way = 'up'; // Tribute to Pat Metheny
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if ($to_version > $current) {
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// upgrade
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$min = $current + 1;
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$max = $to_version;
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} else {
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// downgrade
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$the_way = 'do';
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$max = $current;
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$min = $to_version + 1;
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}
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// Filter the migrations
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$to_run = array();
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foreach ($migrations as $order=>$name) {
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if ($order < $min or $order > $max) {
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continue;
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}
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if ($the_way == 'up') {
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$to_run[] = array($order, $name);
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} else {
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array_unshift($to_run, array($order, $name));
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}
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}
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asort($to_run);
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// Run the migrations
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foreach ($to_run as $migration) {
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$this->runMigration($migration, $the_way);
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}
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}
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/**
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* Run the given migration.
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*/
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public function runMigration($migration, $the_way='up')
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{
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$target_version = ($the_way == 'up') ? $migration[0] : $migration[0]-1;
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if ($this->display) {
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echo($migration[0].' '.$migration[1].' '.$the_way."\n");
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}
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if (!$this->dry_run) {
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if ($the_way == 'up') {
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$func = $this->app.'_Migrations_'.$migration[1].'_up';
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} else {
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$func = $this->app.'_Migrations_'.$migration[1].'_down';
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}
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Pluf::loadFunction($func);
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$func(); // Real migration run
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$this->setAppVersion($this->app, $target_version);
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}
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}
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/**
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* Set the application version.
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*
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* @param string Application
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* @param int Version
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* @return true
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*/
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public function setAppVersion($app, $version)
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{
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$gschema = new Pluf_DB_SchemaInfo();
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$sql = new Pluf_SQL('application=%s', $app);
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$appinfo = $gschema->getList(array('filter' => $sql->gen()));
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if ($appinfo->count() == 1) {
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$appinfo[0]->version = $version;
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$appinfo[0]->update();
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} else {
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$schema = new Pluf_DB_SchemaInfo();
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$schema->application = $app;
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$schema->version = $version;
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$schema->create();
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}
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return true;
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}
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/**
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* Remove the application information.
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*
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* @param string Application
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* @return true
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*/
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public function delAppInfo($app)
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{
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$gschema = new Pluf_DB_SchemaInfo();
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$sql = new Pluf_SQL('application=%s', $app);
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$appinfo = $gschema->getList(array('filter' => $sql->gen()));
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if ($appinfo->count() == 1) {
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$appinfo[0]->delete();
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}
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return true;
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}
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/**
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* Get the current version of the app.
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*
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* @param string Application.
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* @return int Version.
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*/
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public function getAppVersion($app)
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{
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try {
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$db =& Pluf::db();
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$res = $db->select('SELECT version FROM '.$db->pfx.'schema_info WHERE application='.$db->esc($app));
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return (int) $res[0]['version'];
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} catch (Exception $e) {
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// We should not be here, only in the case of nothing
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// installed. I am not sure if this is a good way to
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// handle this border case anyway. Maybe better to have an
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// 'install' method to run all the migrations in order.
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return 0;
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}
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}
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}
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