src/Core/StorageManager.php

   1 <?php
   2
   3 namespace Friendica\Core;
   4
   5 use Friendica\Database\DBA;
   6 use Friendica\Model\Storage\IStorage;
   7
   8
   9 /**
  10  * @brief Manage storage backends
  11  *
  12  * Core code uses this class to get and set current storage backend class.
  13  * Addons use this class to register and unregister additional backends.
  14  */
  15 class StorageManager
  16 {
  17         private static $default_backends = [
  18                 'Filesystem' => \Friendica\Model\Storage\Filesystem::class,
  19                 'Database' => \Friendica\Model\Storage\Database::class,
  20         ];
  21
  22         private static $backends = [];
  23
  24         private static function setup()
  25         {
  26                 if (count(self::$backends)==0) {
  27                         self::$backends = Config::get('storage', 'backends', self::$default_backends);
  28                 }
  29         }
  30
  31         /**
  32          * @brief Return current storage backend class
  33          * @return string
  34          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  35          */
  36         public static function getBackend()
  37         {
  38                 return Config::get('storage', 'class', '');
  39         }
  40
  41         /**
  42          * @brief Return storage backend class by registered name
  43          *
  44          * @param string  $name  Backend name
  45          * @return string Empty if no backend registered at $name exists
  46          */
  47         public static function getByName($name)
  48         {
  49                 self::setup();
  50                 return defaults(self::$backends, $name, '');
  51         }
  52
  53         /**
  54          * @brief Set current storage backend class
  55          *
  56          * @param string $class Backend class name
  57          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  58          */
  59         public static function setBackend($class)
  60         {
  61                 /// @todo Check that $class implements IStorage
  62                 Config::set('storage', 'class', $class);
  63         }
  64
  65         /**
  66          * @brief Get registered backends
  67          *
  68          * @return array
  69          */
  70         public static function listBackends()
  71         {
  72                 self::setup();
  73                 return self::$backends;
  74         }
  75
  76
  77         /**
  78          * @brief Register a storage backend class
  79          *
  80          * @param string $name  User readable backend name
  81          * @param string $class Backend class name
  82          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  83          */
  84         public static function register($name, $class)
  85         {
  86                 /// @todo Check that $class implements IStorage
  87                 self::setup();
  88                 self::$backends[$name] = $class;
  89                 Config::set('storage', 'backends', self::$backends);
  90         }
  91
  92
  93         /**
  94          * @brief Unregister a storage backend class
  95          *
  96          * @param string $name User readable backend name
  97          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  98          */
  99         public static function unregister($name)
 100         {
 101                 self::setup();
 102                 unset(self::$backends[$name]);
 103                 Config::set('storage', 'backends', self::$backends);
 104         }
 105
 106
 107         /**
 108          * @brief Move resources to storage $dest
 109          *
 110          * Copy existing data to destination storage and delete from source.
 111          * This method cannot move to legacy in-table `data` field.
 112          *
 113          * @param string  $dest    Destination storage class name
 114          * @param array   $tables  Tables to look in for resources. Optional, defaults to ['photo', 'attach']
 115          *
 116          * @throws \Exception
 117          * @return int Number of moved resources
 118          */
 119         public static function move($dest, $tables = null)
 120         {
 121                 if (is_null($dest) || empty($dest)) {
 122                         throw new \Exception('Can\'t move to NULL storage backend');
 123                 }
 124
 125                 if (is_null($tables)) {
 126                         $tables = ['photo', 'attach'];
 127                 }
 128
 129                 $moved = 0;
 130                 foreach ($tables as $table) {
 131                         // Get the rows where backend class is not the destination backend class
 132                         $rr = DBA::select(
 133                                 $table,
 134                                 ['id', 'data', 'backend-class', 'backend-ref'],
 135                                 ['`backend-class` IS NULL or `backend-class` != ?' , $dest ]
 136                         );
 137
 138                         if (DBA::isResult($rr)) {
 139                                 while($r = DBA::fetch($rr)) {
 140                                         $id = $r['id'];
 141                                         $data = $r['data'];
 142                                         /** @var IStorage $backendClass */
 143                                         $backendClass = $r['backend-class'];
 144                                         $backendRef = $r['backend-ref'];
 145                                         if (!is_null($backendClass) && $backendClass !== '') {
 146                                                 Logger::log("get data from old backend " .  $backendClass . " : " . $backendRef);
 147                                                 $data = $backendClass::get($backendRef);
 148                                         }
 149
 150                                         Logger::log("save data to new backend " . $dest);
 151                                         /** @var IStorage $dest */
 152                                         $ref = $dest::put($data);
 153                                         Logger::log("saved data as " . $ref);
 154
 155                                         if ($ref !== '') {
 156                                                 Logger::log("update row");
 157                                                 $ru = DBA::update($table, ['backend-class' => $dest, 'backend-ref' => $ref, 'data' => ''], ['id' => $id]);
 158
 159                                                 if ($ru) {
 160                                                         if (!is_null($backendClass) && $backendClass !== '') {
 161                                                                 Logger::log("delete data from old backend " . $backendClass . " : " . $backendRef);
 162                                                                 $backendClass::delete($backendRef);
 163                                                         }
 164                                                         $moved++;
 165                                                 }
 166                                         }
 167                                 }
 168                         }
 169                 }
 170
 171                 return $moved;
 172         }
 173 }
 174