src/Database/View.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Database;
  23
  24 use Exception;
  25 use Friendica\Core\Hook;
  26 use Friendica\DI;
  27
  28 class View
  29 {
  30         /**
  31          * view definition loaded from static/dbview.config.php
  32          *
  33          * @var array
  34          */
  35         private static $definition = [];
  36
  37         /**
  38          * Loads the database structure definition from the static/dbview.config.php file.
  39          * On first pass, defines DB_UPDATE_VERSION constant.
  40          *
  41          * @see static/dbview.config.php
  42          * @param boolean $with_addons_structure Whether to tack on addons additional tables
  43          * @param string  $basePath              The base path of this application
  44          * @return array
  45          * @throws Exception
  46          */
  47         public static function definition($basePath = '', $with_addons_structure = true)
  48         {
  49                 if (!self::$definition) {
  50                         if (empty($basePath)) {
  51                                 $basePath = DI::app()->getBasePath();
  52                         }
  53
  54                         $filename = $basePath . '/static/dbview.config.php';
  55
  56                         if (!is_readable($filename)) {
  57                                 throw new Exception('Missing database view config file static/dbview.config.php');
  58                         }
  59
  60                         $definition = require $filename;
  61
  62                         if (!$definition) {
  63                                 throw new Exception('Corrupted database view config file static/dbview.config.php');
  64                         }
  65
  66                         self::$definition = $definition;
  67                 } else {
  68                         $definition = self::$definition;
  69                 }
  70
  71                 if ($with_addons_structure) {
  72                         Hook::callAll('dbview_definition', $definition);
  73                 }
  74
  75                 return $definition;
  76         }
  77
  78         public static function create(bool $verbose, bool $action)
  79         {
  80                 // Delete previously used views that aren't used anymore
  81                 foreach(['post-view', 'post-thread-view'] as $view) {
  82                         if (self::isView($view)) {
  83                                 $sql = sprintf("DROP VIEW IF EXISTS `%s`", DBA::escape($view));
  84                                 if (!empty($sql) && $verbose) {
  85                                         echo $sql . ";\n";
  86                                 }
  87
  88                                 if (!empty($sql) && $action) {
  89                                         DBA::e($sql);
  90                                 }
  91                         }
  92                 }
  93
  94                 $definition = self::definition();
  95
  96                 foreach ($definition as $name => $structure) {
  97                         self::createview($name, $structure, $verbose, $action);
  98                 }
  99         }
 100
 101         public static function printStructure($basePath)
 102         {
 103                 $database = self::definition($basePath, false);
 104
 105                 foreach ($database AS $name => $structure) {
 106                         echo "--\n";
 107                         echo "-- VIEW $name\n";
 108                         echo "--\n";
 109                         self::createView($name, $structure, true, false);
 110
 111                         echo "\n";
 112                 }
 113         }
 114
 115         private static function createview($name, $structure, $verbose, $action)
 116         {
 117                 $r = true;
 118
 119                 $sql_rows = [];
 120                 foreach ($structure["fields"] AS $fieldname => $origin) {
 121                         if (is_string($origin)) {
 122                                 $sql_rows[] = $origin . " AS `" . DBA::escape($fieldname) . "`";
 123                         } elseif (is_array($origin) && (sizeof($origin) == 2)) {
 124                                 $sql_rows[] = "`" . DBA::escape($origin[0]) . "`.`" . DBA::escape($origin[1]) . "` AS `" . DBA::escape($fieldname) . "`";
 125                         }
 126                 }
 127
 128                 if (self::isView($name)) {
 129                         $sql = sprintf("DROP VIEW IF EXISTS `%s`", DBA::escape($name));
 130                 } elseif (self::isTable($name)) {
 131                         $sql = sprintf("DROP TABLE IF EXISTS `%s`", DBA::escape($name));
 132                 }
 133
 134                 if (!empty($sql) && $verbose) {
 135                         echo $sql . ";\n";
 136                 }
 137
 138                 if (!empty($sql) && $action) {
 139                         DBA::e($sql);
 140                 }
 141
 142                 $sql = sprintf("CREATE VIEW `%s` AS SELECT \n\t", DBA::escape($name)) .
 143                         implode(",\n\t", $sql_rows) . "\n\t" . $structure['query'];
 144
 145                 if ($verbose) {
 146                         echo $sql . ";\n";
 147                 }
 148
 149                 if ($action) {
 150                         $r = DBA::e($sql);
 151                 }
 152
 153                 return $r;
 154         }
 155
 156         /**
 157          * Check if the given table/view is a view
 158          *
 159          * @param string $view
 160          * @return boolean "true" if it's a view
 161          */
 162         private static function isView(string $view)
 163         {
 164                 $status = DBA::selectFirst(['INFORMATION_SCHEMA' => 'TABLES'], ['TABLE_TYPE'],
 165                         ['TABLE_SCHEMA' => DBA::databaseName(), 'TABLE_NAME' => $view]);
 166
 167                 if (empty($status['TABLE_TYPE'])) {
 168                         return false;
 169                 }
 170
 171                 return $status['TABLE_TYPE'] == 'VIEW';
 172         }
 173
 174         /**
 175          * Check if the given table/view is a table
 176          *
 177          * @param string $table
 178          * @return boolean "true" if it's a table
 179          */
 180         private static function isTable(string $table)
 181         {
 182                 $status = DBA::selectFirst(['INFORMATION_SCHEMA' => 'TABLES'], ['TABLE_TYPE'],
 183                         ['TABLE_SCHEMA' => DBA::databaseName(), 'TABLE_NAME' => $table]);
 184
 185                 if (empty($status['TABLE_TYPE'])) {
 186                         return false;
 187                 }
 188
 189                 return $status['TABLE_TYPE'] == 'BASE TABLE';
 190         }
 191 }