materio-base-d7/sites/all/modules/contrib/search/search_api/search_api.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the Search API module.
 */

/**
 * Implements hook_schema().
 */
function search_api_schema() {
  $schema['search_api_server'] = array(
    'description' => 'Stores all search servers created through the Search API.',
    'fields' => array(
      'id' => array(
        'description' => 'The primary identifier for a server.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'name' => array(
        'description' => 'The displayed name for a server.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'machine_name' => array(
        'description' => 'The machine name for a server.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'description' => array(
        'description' => 'The displayed description for a server.',
        'type' => 'text',
        'not null' => FALSE,
      ),
      'class' => array(
        'description' => 'The id of the service class to use for this server.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'options' => array(
        'description' => 'The options used to configure the service object.',
        'type' => 'text',
        'size' => 'medium',
        'serialize' => TRUE,
        'not null' => TRUE,
      ),
      'enabled' => array(
        'description' => 'A flag indicating whether the server is enabled.',
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 1,
      ),
      'status' => array(
        'description' => 'The exportable status of the entity.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0x01,
        'size' => 'tiny',
      ),
      'module' => array(
        'description' => 'The name of the providing module if the entity has been defined in code.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => FALSE,
      ),
    ),
    'indexes' => array(
      'enabled' => array('enabled'),
    ),
    'unique keys' => array(
      'machine_name' => array('machine_name'),
    ),
    'primary key' => array('id'),
  );

  $schema['search_api_index'] = array(
    'description' => 'Stores all search indexes on a {search_api_server}.',
    'fields' => array(
      'id' => array(
        'description' => 'An integer identifying the index.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'name' => array(
        'description' => 'A name to be displayed for the index.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'machine_name' => array(
        'description' => 'The machine name of the index.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'description' => array(
        'description' => "A string describing the index' use to users.",
        'type' => 'text',
        'not null' => FALSE,
      ),
      'server' => array(
        'description' => 'The {search_api_server}.machine_name with which data should be indexed.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => FALSE,
      ),
      'item_type' => array(
        'description' => 'The type of items stored in this index.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'options' => array(
        'description' => 'An array of additional arguments configuring this index.',
        'type' => 'text',
        'size' => 'medium',
        'serialize' => TRUE,
        'not null' => TRUE,
      ),
      'enabled' => array(
        'description' => 'A flag indicating whether this index is enabled.',
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 1,
      ),
      'read_only' => array(
        'description' => 'A flag indicating whether to write to this index.',
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
      ),
      'status' => array(
        'description' => 'The exportable status of the entity.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0x01,
        'size' => 'tiny',
      ),
      'module' => array(
        'description' => 'The name of the providing module if the entity has been defined in code.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => FALSE,
      ),
    ),
    'indexes' => array(
      'item_type' => array('item_type'),
      'server' => array('server'),
      'enabled' => array('enabled'),
    ),
    'unique keys' => array(
      'machine_name' => array('machine_name'),
    ),
    'primary key' => array('id'),
  );

  $schema['search_api_item'] = array(
    'description' => 'Stores the items which should be indexed for each index, and their status.',
    'fields' => array(
      'item_id' => array(
        'description' => "The item's entity id (e.g. {node}.nid for nodes).",
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'index_id' => array(
        'description' => 'The {search_api_index}.id this item belongs to.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'changed' => array(
        'description' => 'Either a flag or a timestamp to indicate if or when the item was changed since it was last indexed.',
        'type' => 'int',
        'size' => 'big',
        'not null' => TRUE,
        'default' => 1,
      ),
    ),
    'indexes' => array(
      'indexing' => array('index_id', 'changed'),
    ),
    'primary key' => array('item_id', 'index_id'),
  );

  $schema['search_api_task'] = array(
    'description' => 'Stores pending tasks for servers.',
    'fields' => array(
      'id' => array(
        'description' => 'An integer identifying this task.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'server_id' => array(
        'description' => 'The {search_api_server}.machine_name for which this task should be executed.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'type' => array(
        'description' => 'A keyword identifying the type of task that should be executed.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'index_id' => array(
        'description' => 'The {search_api_index}.machine_name to which this task pertains, if applicable for this type.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => FALSE,
      ),
      'data' => array(
        'description' => 'Some data needed for the task, might be optional depending on the type.',
        'type' => 'text',
        'size' => 'medium',
        'serialize' => TRUE,
        'not null' => FALSE,
      ),
    ),
    'indexes' => array(
      'server' => array('server_id'),
    ),
    'primary key' => array('id'),
  );

  return $schema;
}

/**
 * Implements hook_install().
 *
 * Creates a default node index if the module is installed manually.
 */
function search_api_install() {
  // In case the module is installed via an installation profile, a batch is
  // active and we skip that.
  if (batch_get()) {
    return;
  }

  $name = t('Default node index');
  $values = array(
    'name' => $name,
    'machine_name' => preg_replace('/[^a-z0-9]+/', '_', drupal_strtolower($name)),
    'description' => t('An automatically created search index for indexing node data. Might be configured to specific needs.'),
    'server' => NULL,
    'item_type' => 'node',
    'options' => array(
      'index_directly' => 1,
      'cron_limit' => '50',
      'data_alter_callbacks' => array(
        'search_api_alter_node_access' => array(
          'status' => 1,
          'weight' => '0',
          'settings' => array(),
        ),
      ),
      'processors' => array(
        'search_api_case_ignore' => array(
          'status' => 1,
          'weight' => '0',
          'settings' => array(
            'strings' => 0,
          ),
        ),
        'search_api_html_filter' => array(
          'status' => 1,
          'weight' => '10',
          'settings' => array(
            'title' => 0,
            'alt' => 1,
            'tags' => "h1 = 5\n" .
                "h2 = 3\n" .
                "h3 = 2\n" .
                "strong = 2\n" .
                "b = 2\n" .
                "em = 1.5\n" .
                "u = 1.5",
          ),
        ),
        'search_api_tokenizer' => array(
          'status' => 1,
          'weight' => '20',
          'settings' => array(
            'spaces' => '[^\\p{L}\\p{N}]',
            'ignorable' => '[-]',
          ),
        ),
      ),
      'fields' => array(
        'type' => array(
          'type' => 'string',
        ),
        'title' => array(
          'type' => 'text',
          'boost' => '5.0',
        ),
        'promote' => array(
          'type' => 'boolean',
        ),
        'sticky' => array(
          'type' => 'boolean',
        ),
        'created' => array(
          'type' => 'date',
        ),
        'changed' => array(
          'type' => 'date',
        ),
        'author' => array(
          'type' => 'integer',
          'entity_type' => 'user',
        ),
        'comment_count' => array(
          'type' => 'integer',
        ),
        'search_api_language' => array(
          'type' => 'string',
        ),
        'body:value' => array(
          'type' => 'text',
        ),
      ),
    ),
  );
  search_api_index_insert($values);
  drupal_set_message('The Search API module was installed. A new default node index was created.');
}

/**
 * Implements hook_enable().
 *
 * Mark all items as "dirty", since we can't know whether they are.
 */
function search_api_enable() {
  $types = array();
  foreach (search_api_index_load_multiple(FALSE) as $index) {
    if ($index->enabled) {
      $types[$index->item_type][] = $index;
    }
  }
  foreach ($types as $type => $indexes) {
    try {
      $controller = search_api_get_datasource_controller($type);
      $controller->startTracking($indexes);
    }
    catch (SearchApiException $e) {
      watchdog_exception('search_api', $e);
    }
  }
}

/**
 * Implements hook_disable().
 */
function search_api_disable() {
  $types = array();
  foreach (search_api_index_load_multiple(FALSE) as $index) {
    $types[$index->item_type][] = $index;
  }
  foreach ($types as $type => $indexes) {
    try {
      $controller = search_api_get_datasource_controller($type);
      $controller->stopTracking($indexes);
    }
    catch (SearchApiException $e) {
      // Modules defining entity or item types might have been disabled. Ignore.
    }
  }
}

/**
 * Implements hook_uninstall().
 */
function search_api_uninstall() {
  variable_del('search_api_index_worker_callback_runtime');
}

/**
 * Update function that adds the machine names for servers and indexes.
 */
function search_api_update_7101() {
  $tx = db_transaction();
  try {
    // Servers
    $spec = array(
      'description' => 'The machine name for a server.',
      'type' => 'varchar',
      'length' => 50,
      'not null' => TRUE,
      'default' => '',
    );
    db_add_field('search_api_server', 'machine_name', $spec);

    $names = array();
    $servers = db_select('search_api_server', 's')
      ->fields('s')
      ->execute();
    foreach ($servers as $server) {
      $base = $name = drupal_strtolower(preg_replace('/[^a-z0-9]+/i', '_', $server->name));
      $i = 0;
      while (isset($names[$name])) {
        $name = $base . '_' . ++$i;
      }
      $names[$name] = TRUE;
      db_update('search_api_server')
        ->fields(array('machine_name' => $name))
        ->condition('id', $server->id)
        ->execute();
    }

    db_add_unique_key('search_api_server', 'machine_name', array('machine_name'));

    //Indexes
    $spec = array(
      'description' => 'The machine name of the index.',
      'type' => 'varchar',
      'length' => 50,
      'not null' => TRUE,
      'default' => '',
    );
    db_add_field('search_api_index', 'machine_name', $spec);

    $names = array();
    $indexes = db_select('search_api_index', 'i')
      ->fields('i')
      ->execute();
    foreach ($indexes as $index) {
      $base = $name = drupal_strtolower(preg_replace('/[^a-z0-9]+/i', '_', $index->name));
      $i = 0;
      while (isset($names[$name])) {
        $name = $base . '_' . ++$i;
      }
      $names[$name] = TRUE;
      db_update('search_api_index')
        ->fields(array('machine_name' => $name))
        ->condition('id', $index->id)
        ->execute();
    }

    db_add_unique_key('search_api_index', 'machine_name', array('machine_name'));
  }
  catch (Exception $e) {
    $tx->rollback();
    try {
      db_drop_field('search_api_server', 'machine_name');
      db_drop_field('search_api_index', 'machine_name');
    }
    catch (Exception $e1) {
      // Ignore.
    }
    throw new DrupalUpdateException(t('An exception occurred during the update: @msg.', array('@msg' => $e->getMessage())));
  }
}

/**
 * Update replacing IDs with machine names for foreign keys.
 * {search_api_index}.server and {search_api_item}.index_id are altered.
 */
function search_api_update_7102() {
  // Update of search_api_index:
  $indexes = array();
  $select = db_select('search_api_index', 'i')->fields('i');
  foreach ($select->execute() as $index) {
    $indexes[$index->id] = $index;
  }
  $servers = db_select('search_api_server', 's')->fields('s', array('id', 'machine_name'))->execute()->fetchAllKeyed();

  db_drop_index('search_api_index', 'server');
  db_drop_field('search_api_index', 'server');
  $spec = array(
    'description' => 'The {search_api_server}.machine_name with which data should be indexed.',
    'type' => 'varchar',
    'length' => 50,
    'not null' => FALSE,
  );
  db_add_field('search_api_index', 'server', $spec);

  foreach ($indexes as $index) {
    db_update('search_api_index')
      ->fields(array('server' => $servers[$index->server]))
      ->condition('id', $index->id)
      ->execute();
  }
  db_add_index('search_api_index', 'server', array('server'));

  // Update of search_api_item:
  db_drop_index('search_api_item', 'indexing');
  db_drop_primary_key('search_api_item');
  $spec = array(
    'description' => 'The {search_api_index}.machine_name this item belongs to.',
    'type' => 'varchar',
    'length' => 50,
    'not null' => TRUE,
  );
  $keys_new = array(
    'indexes' => array(
      'indexing' => array('index_id', 'changed'),
    ),
    'primary key' => array('item_id', 'index_id'),
  );
  db_change_field('search_api_item', 'index_id', 'index_id', $spec, $keys_new);

  foreach ($indexes as $index) {
    // We explicitly forbid numeric machine names, therefore we don't have to
    // worry about conflicts here.
    db_update('search_api_item')
      ->fields(array(
        'index_id' => $index->machine_name,
      ))
      ->condition('index_id', $index->id)
      ->execute();
  }
}

/**
 * Add the database fields newly required for entities by the Entity API.
 */
function search_api_update_7103() {
  if (!function_exists('entity_exportable_schema_fields')) {
    throw new DrupalUpdateException(t('Please update the Entity API module first.'));
  }
  foreach (array('search_api_server', 'search_api_index') as $table) {
    foreach (entity_exportable_schema_fields() as $field => $spec) {
      db_add_field($table, $field, $spec);
    }
  }
}

/**
 * Initialize the "Fields to run on" settings for processors.
 */
function search_api_update_7107() {
  $rows = db_select('search_api_index', 'i')
    ->fields('i', array('id', 'options'))
    ->execute()
    ->fetchAllKeyed();
  foreach ($rows as $id => $options) {
    $opt = unserialize($options);
    $processors = &$opt['processors'];
    // Only update our own processors, don't mess with others.
    $check_processors = array(
      'search_api_case_ignore' => 1,
      'search_api_html_filter' => 1,
      'search_api_tokenizer' => 1,
    );
    foreach (array_intersect_key($processors, $check_processors) as $name => $info) {
      $types = array('text');
      if (!empty($info['settings']['strings'])) {
        $types[] = 'string';
        unset($processors[$name]['settings']['strings']);
      }
      foreach ($opt['fields'] as $field => $info) {
        if ($info['indexed'] && search_api_is_text_type($info['type'], $types)) {
          $processors[$name]['settings']['fields'][$field] = $field;
        }
      }
    }
    $opt = serialize($opt);
    if ($opt != $options) {
      db_update('search_api_index')
        ->fields(array(
          'options' => $opt,
        ))
        ->condition('id', $id)
        ->execute();
    }
  }
}

/**
 * Change {search_api_item}.index_id back to the index' numeric ID.
 */
function search_api_update_7104() {
  $select = db_select('search_api_index', 'i')->fields('i');
  foreach ($select->execute() as $index) {
    // We explicitly forbid numeric machine names, therefore we don't have to
    // worry about conflicts here.
    db_update('search_api_item')
      ->fields(array(
        'index_id' => $index->id,
      ))
      ->condition('index_id', $index->machine_name)
      ->execute();
  }

  // Update primary key and index.
  db_drop_index('search_api_item', 'indexing');
  db_drop_primary_key('search_api_item');
  $spec = array(
    'description' => 'The {search_api_index}.id this item belongs to.',
    'type' => 'int',
    'unsigned' => TRUE,
    'not null' => TRUE,
  );
  $keys_new = array(
    'indexes' => array(
      'indexing' => array('index_id', 'changed'),
    ),
    'primary key' => array('item_id', 'index_id'),
  );
  db_change_field('search_api_item', 'index_id', 'index_id', $spec, $keys_new);
}

/**
 * Remove all empty aggregated fields for the search_api_alter_add_fulltext data
 * alterations.
 */
function search_api_update_7105() {
  $rows = db_select('search_api_index', 'i')
    ->fields('i', array('id', 'options'))
    ->execute()
    ->fetchAllKeyed();
  foreach ($rows as $id => $options) {
    $opt = unserialize($options);
    if (isset($opt['data_alter_callbacks']['search_api_alter_add_fulltext']['settings']['fields'])) {
      foreach ($opt['data_alter_callbacks']['search_api_alter_add_fulltext']['settings']['fields'] as $name => $field) {
        if (empty($field['name']) || empty($field['fields'])) {
          unset($opt['data_alter_callbacks']['search_api_alter_add_fulltext']['settings']['fields'][$name]);
        }
      }
    }
    $opt = serialize($opt);
    if ($opt != $options) {
      db_update('search_api_index')
        ->fields(array(
          'options' => $opt,
        ))
        ->condition('id', $id)
        ->execute();
    }
  }
}

/**
 * Update the settings for the "Aggregated fields" data alteration.
 */
function search_api_update_7106() {
  $rows = db_select('search_api_index', 'i')
    ->fields('i')
    ->execute()
    ->fetchAll();
  foreach ($rows as $row) {
    $opt = unserialize($row->options);
    $callbacks = &$opt['data_alter_callbacks'];
    if (isset($callbacks['search_api_alter_add_fulltext'])) {
      $callbacks['search_api_alter_add_aggregation'] = $callbacks['search_api_alter_add_fulltext'];
      unset($callbacks['search_api_alter_add_fulltext']);
      if (!empty($callbacks['search_api_alter_add_aggregation']['settings']['fields'])) {
        foreach ($callbacks['search_api_alter_add_aggregation']['settings']['fields'] as &$info) {
          if (!isset($info['type'])) {
            $info['type'] = 'fulltext';
          }
        }
      }
    }
    $opt = serialize($opt);
    if ($opt != $row->options) {
      // Mark the entity as overridden, in case it has been defined in code
      // only.
      $row->status |= 0x01;
      db_update('search_api_index')
        ->fields(array(
          'options' => $opt,
          'status' => $row->status,
        ))
        ->condition('id', $row->id)
        ->execute();
    }
  }
}

/**
 * Add "read only" property to Search API index entities.
 */
function search_api_update_7108() {
  $db_field = array(
    'description' => 'A flag indicating whether to write to this index.',
    'type' => 'int',
    'size' => 'tiny',
    'not null' => TRUE,
    'default' => 0,
  );
  db_add_field('search_api_index', 'read_only', $db_field);
  return t('Added a "read only" property to index entities.');
}

/**
 * Clear entity info cache, as entity controller classes hae changed.
 */
function search_api_update_7109() {
  cache_clear_all('entity_info:', 'cache', TRUE);
}

/**
 * Rename the "entity_type" field to "item_type" in the {search_api_index} table.
 */
function search_api_update_7110() {
  $table = 'search_api_index';
  // This index isn't used anymore.
  db_drop_index($table, 'entity_type');
  // Rename the "item_type" field (and change the description).
  $item_type = array(
    'description' => 'The type of items stored in this index.',
    'type' => 'varchar',
    'length' => 50,
    'not null' => TRUE,
  );
  // Also add the new "item_type" index, while we're at it.
  $keys_new['indexes']['item_type'] = array('item_type');
  db_change_field($table, 'entity_type', 'item_type', $item_type, $keys_new);
  // Mark all indexes in code as "OVERRIDDEN".
  db_update($table)
    ->fields(array(
      'status' => 0x03,
    ))
    ->condition('status', 0x02)
    ->execute();
  // Clear entity info caches.
  cache_clear_all('*', 'cache', TRUE);
}

/**
 * Change the definition of the {search_api_item}.changed field.
 */
function search_api_update_7111() {
  $spec = array(
    'description' => 'Either a flag or a timestamp to indicate if or when the item was changed since it was last indexed.',
    'type' => 'int',
    'size' => 'big',
    'not null' => TRUE,
    'default' => 1,
  );
  db_change_field('search_api_item', 'changed', 'changed', $spec);
}

/**
 * Changes the size of the {search_api_index}.options and {search_api_server}.options fields to "medium".
 */
function search_api_update_7112() {
  $spec = array(
    'description' => 'The options used to configure the service object.',
    'type' => 'text',
    'size' => 'medium',
    'serialize' => TRUE,
    'not null' => TRUE,
  );
  db_change_field('search_api_server', 'options', 'options', $spec);
  $spec = array(
    'description' => 'An array of additional arguments configuring this index.',
    'type' => 'text',
    'size' => 'medium',
    'serialize' => TRUE,
    'not null' => TRUE,
  );
  db_change_field('search_api_index', 'options', 'options', $spec);
}

/**
 * Removes superfluous data from the stored index options.
 */
function search_api_update_7113() {
  $indexes = db_select('search_api_index', 'i')
    ->fields('i')
    ->execute();
  foreach ($indexes as $index) {
    $options = unserialize($index->options);
    // Weed out fields settings.
    if (!empty($options['fields'])) {
      foreach ($options['fields'] as $key => $field) {
        if (isset($field['indexed']) && !$field['indexed']) {
          unset($options['fields'][$key]);
          continue;
        }
        unset($options['fields'][$key]['name'], $options['fields'][$key]['indexed']);
        if (isset($field['boost']) && $field['boost'] == '1.0') {
          unset($options['fields'][$key]['boost']);
        }
      }
    }
    // Weed out processor settings.
    if (!empty($options['processors'])) {
      // Only weed out settings for our own processors.
      $processors = array('search_api_case_ignore', 'search_api_html_filter', 'search_api_tokenizer', 'search_api_stopwords');
      foreach ($processors as $key) {
        if (empty($options['processors'][$key])) {
          continue;
        }
        $processor = $options['processors'][$key];
        if (empty($processor['settings']['fields'])) {
          continue;
        }
        $fields = array_filter($processor['settings']['fields']);
        if ($fields) {
          $fields = array_combine($fields, array_fill(0, count($fields), TRUE));
        }
        $options['processors'][$key]['settings']['fields'] = $fields;
      }
    }
    // Weed out settings for the „Aggregated fields“ data alteration.
    if (!empty($options['data_alter_callbacks']['search_api_alter_add_aggregation']['settings']['fields'])) {
      unset($options['data_alter_callbacks']['search_api_alter_add_aggregation']['settings']['actions']);
      $aggregated_fields = &$options['data_alter_callbacks']['search_api_alter_add_aggregation']['settings']['fields'];
      foreach ($aggregated_fields as $key => $field) {
        unset($aggregated_fields[$key]['actions']);
        if (!empty($field['fields'])) {
          $aggregated_fields[$key]['fields'] = array_values(array_filter($field['fields']));
        }
      }
    }
    $options = serialize($options);
    if ($options != $index->options) {
      // Mark the entity as overridden, in case it has been defined in code
      // only.
      $index->status |= 0x01;
      db_update('search_api_index')
        ->fields(array(
          'options' => $options,
          'status' => $index->status,
        ))
        ->condition('id', $index->id)
        ->execute();
    }
  }
}

/**
 * Sanitize watchdog messages.
 */
function search_api_update_7114() {
  if (db_table_exists('watchdog')) {
    try {
      $entries = db_select('watchdog', 'w')
        ->fields('w', array('wid', 'message'))
        ->condition('type', 'search_api')
        ->execute();
      foreach ($entries as $entry) {
        db_update('watchdog')
          ->fields(array(
            'message' => check_plain($entry->message),
          ))
          ->condition('wid', $entry->wid)
          ->execute();
      }
    }
    catch (Exception $e) {
      throw new DrupalUpdateException(t('An exception occurred during the update: @msg.', array('@msg' => $e->getMessage())));
    }
  }
}

/**
 * Switch to indexing without the use of a cron queue.
 */
function search_api_update_7115() {
  variable_del('search_api_batch_per_cron');
  DrupalQueue::get('search_api_indexing_queue')->deleteQueue();
  db_update('search_api_item')
    ->fields(array(
      'changed' => 1,
    ))
    ->condition('changed', 0, '<')
    ->execute();
}

/**
 * Transfers the tasks for disabled servers to a separate database table.
 */
function search_api_update_7116() {
  // Create table.
  $table = array(
    'description' => 'Stores pending tasks for servers.',
    'fields' => array(
      'id' => array(
        'description' => 'An integer identifying this task.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'server_id' => array(
        'description' => 'The {search_api_server}.machine_name for which this task should be executed.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'type' => array(
        'description' => 'A keyword identifying the type of task that should be executed.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
      ),
      'index_id' => array(
        'description' => 'The {search_api_index}.machine_name to which this task pertains, if applicable for this type.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => FALSE,
      ),
      'data' => array(
        'description' => 'Some data needed for the task, might be optional depending on the type.',
        'type' => 'text',
        'size' => 'medium',
        'serialize' => TRUE,
        'not null' => FALSE,
      ),
    ),
    'indexes' => array(
      'server' => array('server_id'),
    ),
    'primary key' => array('id'),
  );
  db_create_table('search_api_task', $table);

  // Collect old tasks.
  $tasks = array();
  foreach (variable_get('search_api_tasks', array()) as $server => $indexes) {
    foreach ($indexes as $index => $old_tasks) {
      if (in_array('clear all', $old_tasks)) {
        $tasks[] = array(
          'server_id' => $server,
          'type' => 'deleteItems',
        );
      }
      if (in_array('remove', $old_tasks)) {
        $tasks[] = array(
          'server_id' => $server,
          'type' => 'removeIndex',
          'index_id' => $index,
        );
      }
    }
  }
  variable_del('search_api_tasks');

  $select = db_select('search_api_index', 'i')
    ->fields('i', array('machine_name', 'server'));
  $select->innerJoin('search_api_server', 's', 'i.server = s.machine_name AND s.enabled = 0');
  $index_ids = array();
  foreach ($select->execute() as $index) {
    $index_ids[] = $index->machine_name;
    $tasks[] = array(
      'server_id' => $index->server,
      'type' => 'removeIndex',
      'index_id' => $index->machine_name,
    );
  }
  if ($index_ids) {
    db_update('search_api_index')
      ->fields(array(
        'enabled' => 0,
        'server' => NULL,
      ))
      ->condition('machine_name', $index_ids)
      ->execute();
  }

  if ($tasks) {
    $insert = db_insert('search_api_task')
      ->fields(array('server_id', 'type', 'index_id', 'data'));
    foreach ($tasks as $task) {
      $task += array(
        'index_id' => NULL,
        'data' => NULL,
      );
      $insert->values($task);
    }
    $insert->execute();
  }
}

/**
 * Checks the database for illegal {search_api_index}.server values.
 */
function search_api_update_7117() {
  $servers = db_select('search_api_server', 's')
    ->fields('s', array('machine_name'))
    ->condition('enabled', 1);
  $indexes = db_select('search_api_index', 'i')
    ->fields('i', array('id'))
    ->condition('server', $servers, 'NOT IN')
    ->execute()
    ->fetchCol();
  if ($indexes) {
    db_delete('search_api_item')
      ->condition('index_id', $indexes)
      ->execute();
    db_update('search_api_index')
      ->fields(array(
        'server' => NULL,
        'enabled' => 0,
      ))
      ->condition('id', $indexes)
      ->execute();
  }
}