forked from GNUsocial/gnu-social
118 lines
3.4 KiB
PHP
118 lines
3.4 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Database schema utilities
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Database
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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exit(1);
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}
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class SchemaUpdater
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{
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public function __construct($schema)
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{
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$this->schema = $schema;
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$this->conn = $conn;
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$this->checksums = $this->getChecksums();
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}
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/**
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* @param array $tableDefs
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* @fixme handle tables that belong on different database servers...?
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*/
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public function checkTables(array $tableDefs)
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{
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$checksums = $this->checksums;
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foreach ($tableDefs as $table => $def) {
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$checksum = $this->tableChecksum($def);
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if (empty($checksums[$table])) {
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common_log(LOG_DEBUG, "No previous schema_version for $table: updating to $checksum");
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} else if ($checksums[$table] == $checksum) {
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common_log(LOG_DEBUG, "Last schema_version for $table up to date: $checksum");
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continue;
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} else {
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common_log(LOG_DEBUG, "Last schema_version for $table is {$checksums[$table]}: updating to $checksum");
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}
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$this->conn->query('BEGIN');
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$this->schema->ensureTable($table, $def);
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$this->saveChecksum($table, $checksum);
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$this->conn->commit();
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}
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}
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/**
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* Calculate a checksum for this table definition array.
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*
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* @param array $def
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* @return string
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*/
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public function checksum(array $def)
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{
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$flat = serialize($def);
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return sha1($flat);
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}
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/**
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* Pull all known table checksums into an array for easy lookup.
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*
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* @return array: associative array of table names to checksum strings
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*/
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protected function getChecksums()
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{
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$checksums = array();
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$sv = new Schema_version();
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$sv->find();
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while ($sv->fetch()) {
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$checksums[$sv->table_name] = $sv->checksum;
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}
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return $checksums;
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}
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/**
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* Save or update current available checksums.
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*
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* @param string $table
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* @param string $checksum
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*/
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protected function saveChecksum($table, $checksum)
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{
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$sv = new Schema_version();
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$sv->table_name = $table;
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$sv->checksum = $checksum;
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$sv->modified = common_sql_now();
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if (isset($this->checksums[$table])) {
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$sv->update();
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} else {
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$sv->insert();
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}
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$this->checksums[$table] = $checksum;
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}
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}
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