Need help with cron hook to update uc_stock

Can someone please write me a cron hook for Drupal 7 Ubercart 3 to update uc_stock?
I'm using feeds and uc_feeds to import product data. All I need is to update the existing product stock field.
I've included uc_feeds for D7 and the uc_feeds-6.x-1.x that uses the stock update. The stock update is not written in the D7 version. After many, many attempts, I just can't write it myself.

Thanks,

Katie

Here's uc_feeds-7.x:
<?php

/**
* Implementation of hook_feeds_processor_targets_alter().
*/
function uc_feeds_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_name) {
// Proceed only if the content_type is a product type.
if ($entity_type == 'node' && in_array($bundle_name, uc_product_types())) {
// Model
$targets['model'] = array(
'name' => t('UC: Model/SKU'),
'callback' => 'uc_feeds_set_target',
'description' => 'Ubercart:' . t('Model/SKU'),
);
// List price
$targets['list_price'] = array(
'name' => t('UC: List price'),
'callback' => 'uc_feeds_set_target',
'description' => 'Ubercart:' . t('List price'),
);
// Cost
$targets['cost'] = array(
'name' => t('UC: Cost'),
'callback' => 'uc_feeds_set_target',
'description' => 'Ubercart:' . t('Cost'),
);
// Sell price
$targets['sell_price'] = array(
'name' => t('UC: Sell price'),
'callback' => 'uc_feeds_set_target',
'description' => 'Ubercart:' . t('Sell price'),
);
// Weight
$targets['weight'] = array(
'name' => t('UC: Weight'),
'callback' => 'uc_feeds_set_target',
'description' => 'Ubercart:' . t('Weight'),
);
$targets['weight_units'] = array(
'name' => t('UC: Weight Unit'),
'callback' => 'uc_feeds_set_target',
'description' => 'Ubercart:' . t('Weight Unit'),
);

// Attributes
if (module_exists("uc_attribute")) {
  $attribs = uc_attribute_load_multiple();

  foreach ($attribs as $attrib) {
    $aid = $attrib->aid;

    foreach ($attrib->options as $option) {
      $oid = $option->oid;

      // Attribute Price
      $targets['attribute_price_' . $aid . "_" . $oid] = array(
        'name' => t('UCA Price: ' . $attrib->name . ":" . $option->name),
        'callback' => 'uc_feeds_set_target',
        'description' => 'Ubercart:' . t('Attribute Price:' . $attrib->name . ":" . $option->name),
      );

      // Attribute Cost
      $targets['attribute_cost_' . $aid . "_" . $oid] = array(
        'name' => t('UCA Cost: ' . $attrib->name . ":" . $option->name),
        'callback' => 'uc_feeds_set_target',
        'description' => 'Ubercart:' . t('Attribute Cost:' . $attrib->name . ":" . $option->name),
      );

      // Attribute Weight
      $targets['attribute_weight_' . $aid . "_" . $oid] = array(
        'name' => t('UCA Weight: ' . $attrib->name . ":" . $option->name),
        'callback' => 'uc_feeds_set_target',
        'description' => 'Ubercart:' . t('Attribute Weight:' . $attrib->name . ":" . $option->name),
      );
    }
  }
}

}
}

/**
* user has decided to map to and $value contains the value of the feed item
* element the user has picked as a source.
*/
function uc_feeds_set_target($source, $node, $target, $value) {
if (!is_array($value)) {
if (substr($target, 0, 10) != "attribute_") {
$node->$target = $value;
}
else {
$ao_arr = explode("_", $target);
$aid = $ao_arr[2];
$oid = $ao_arr[3];

  // just flag the attributes for now - node API will take care of saving them
  $node->uc_feeds_flag = "Attributes";

  // If value is empty, it's not an attribute we want to use
  if (substr($target, 0, 15) == "attribute_price" && $value != '') {
    $node->attributes[$aid]->options[$oid]->price = $value;
  }
  elseif (substr($target, 0, 14) == "attribute_cost" && $value != '') {
    $node->attributes[$aid]->options[$oid]->cost = $value;
  }
  elseif (substr($target, 0, 16) == "attribute_weight" && $value != '') {
    $node->attributes[$aid]->options[$oid]->weight = $value;
  }
}

}
}

/**
* Implements hook_feeds_node_insert().
*/
function uc_feeds_node_insert($node) {
if (uc_product_is_product($node) && module_exists("uc_attribute")) {
foreach ($node->attributes as $aid => $feedattrib) {
// Load all options for added attributes. (Will only enable the ones set in the import)
$attribute = uc_attribute_load($aid);

  foreach ($attribute->options as $option) {
    // some part of the option is set, default all empty parts to 0 or ''
    if (isset($node->attributes[$aid]->options[$option->oid])) {
      $option->price = ($node->attributes[$aid]->options[$option->oid]->price != '') ? $node->attributes[$aid]->options[$option->oid]->price : 0;
      $option->cost = ($node->attributes[$aid]->options[$option->oid]->cost != '') ? $node->attributes[$aid]->options[$option->oid]->cost : 0;
      $option->weight = ($node->attributes[$aid]->options[$option->oid]->weight != '') ? $node->attributes[$aid]->options[$option->oid]->weight : 0;

      $id = db_insert('uc_product_options')->fields(array(
        'nid' => $node->nid,
        'oid' => $option->oid,
        'cost' => $option->cost,
        'price' => $option->price,
        'weight' => $option->weight,
        'ordering' => $option->ordering,
      ))->execute();
    }
  }

  // Make the first option (if any) the default.
  $option = reset($attribute->options);
  if ($option) {
    $oid = $option->oid;
  }
  else {
    $oid = 0;
  }
  // TODO Please convert this statement to the D7 database API syntax.

  //Drupal 7 piece added
  $res = db_select('uc_attributes', 'c')
  ->fields('c')
  ->condition('aid',$aid)
  ->execute()
  ->fetchAssoc();

  $nid = db_insert('uc_product_attributes') // Table name no longer needs {}
  ->fields(array(
      'nid' => $node->nid,
      'aid' => $res['aid'],
      'label' => $res['label'],
      'ordering' => $res['ordering'],
      'default_option' => $oid,
      'required' => $res['required'],
      'display' => $res['display'],
    ))
  ->execute();
}

}
}

uc_feeds-6.x-1.x

<?php
/**
* @file
* Integrates Ubercart properties with Feeds
*/

/**
* Implementation of hook_feeds_node_processor_targets_alter().
* @param array $targets
* @param string $content_type
* @return void
*/
function uc_feeds_feeds_node_processor_targets_alter(&$targets, $content_type) {
// Proceed only if the content_type is a product type.
if (in_array($content_type, uc_product_types())) {
// Model
$targets['uc_product:model'] = array(
'name' => t('UC: Model/SKU'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Model/SKU'))),
);
// List price
$targets['uc_product:list_price'] = array(
'name' => t('UC: List price'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('List price'))),
);
// Cost
$targets['uc_product:cost'] = array(
'name' => t('UC: Cost'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Cost'))),
);
// Sell price
$targets['uc_product:sell_price'] = array(
'name' => t('UC: Sell price'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Sell price'))),
);
// Weight
$targets['uc_product:weight'] = array(
'name' => t('UC: Weight'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Weight'))),
);
$targets['uc_product:weight_units'] = array(
'name' => t('UC: Weight Unit'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Weight Unit'))),
);
// Dims
$targets['uc_product:length'] = array(
'name' => t('UC: Length'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Length'))),
);
$targets['uc_product:width'] = array(
'name' => t('UC: Width'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Width'))),
);
$targets['uc_product:height'] = array(
'name' => t('UC: Height'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Height'))),
);
$targets['uc_product:length_units'] = array(
'name' => t('UC: Dimension Units'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Dimension Units'))),
);
$targets['uc_product:pkg_qty'] = array(
'name' => t('UC: pkg_qty'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Package Quantity'))),
);
$targets['uc_product:default_qty'] = array(
'name' => t('UC: default_qty'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Default Quantity to add to cart'))),
);
// Shippable
$targets['uc_product:shippable'] = array(
'name' => t('UC: Shippable'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Shippable'))),
);
// Stock
if (module_exists('uc_stock')) {
$targets['uc_stock:stock'] = array(
'name' => t('UC: Stock Level'),
'callback' => 'uc_feeds_feeds_set_target',
'description' => t('Ubercart: !mapper', array('!mapper' => t('Stock'))),
);
}
// TODO : Price By Role, others?

// Attributes
if (module_exists('uc_attribute') && function_exists('uc_attribute_load_multiple')) {
  $attribs = uc_attribute_load_multiple();
  foreach ($attribs as $attrib) {
    $aid = $attrib->aid;
    foreach ($attrib->options as $option) {
      $oid = $option->oid;
      $targets['uc_attribute:attribute_price_' . $aid . '_' . $oid] = array(
        'name' => t('UCA Price: @attribute:@option', array('@attribute' => $attrib->name, '@option' => $option->name)),
        'callback' => 'uc_feeds_feeds_set_target',
        'description' => t('Ubercart: !mapper', array(
            '!mapper' => t('Attribute Price: @attribute:@option', array('@attribute' => $attrib->name, '@option' => $option->name))
          )
        ),
      );
    }
  }
  foreach ($attribs as $attrib) {
    $aid = $attrib->aid;
    foreach ($attrib->options as $option) {
      $oid = $option->oid;
      $targets['uc_attribute:attribute_weight_' . $aid . '_' . $oid] = array(
        'name' => t('UCA Weight: @attribute:@option', array('@attribute' => $attrib->name, '@option' => $option->name)),
        'callback' => 'uc_feeds_feeds_set_target',
        'description' => t('Ubercart: !mapper', array(
            '!mapper' => t('Attribute Weight: @attribute:@option', array('@attribute' => $attrib->name, '@option' => $option->name))
          )
        ),
      );
    }
  }
}

}
}

/**
* Callback for mapping. Here is where the actual mapping happens.
*
* When the callback is invoked, $target contains the name of the field the
* user has decided to map to and $value contains the value of the feed item
* element the user has picked as a source.
*
* @param object $node
* @param string $target
* @param mixed $value
* @return void
*/
function uc_feeds_feeds_set_target(&$node, $target, $value) {
if (is_array($value) || ($value == '')) {
return;
}

// Examine target: first part is module, second part is target
list($module, $target) = explode(':', $target);

switch ($module) {
// Ubercart Attributes
case 'uc_attribute':
$ao_arr = explode('_', $target);
$aid = $ao_arr[2];
$oid = $ao_arr[3];
// just flag the attributes for now - node API will take care of saving them
$node->uc_feeds_flag = 'Attributes';
if (substr($target, 0, 15) == 'attribute_price') {
$node->attributes[$aid]->options[$oid]->price = $value;
}
elseif (substr($target, 0, 16) == 'attribute_weight') {
$node->attributes[$aid]->options[$oid]->weight = $value;
}
return;

// Stock
case 'uc_stock':
  if (!isset($node->model)) {
    // Error: model is unknown.
    drupal_set_message(t("You can not set the stock for a product if the Model/SKU is not known. Ensure that you map the Model/SKU first.", 'warning'));
    return;
  }
  if (uc_stock_is_active($node->model)) {
    // Update stock levels
    uc_stock_set($node->model, $value);
  }
  else {
    // Insert new stock level. Not sure how to set the threshold. This would be zero now.
    $sQuery = "INSERT INTO {uc_product_stock} (sku, nid, active, stock) VALUES ('%s', %d, %d, %d)"; 
    db_query($sQuery, $node->model, $node->nid, 1, $value);
  }
  return;

// Product
case 'uc_product':
  switch ($target) {
  case 'length':
  case 'width':
  case 'height':
    $d = "dim_$target";
    $node->$d = $value;
    break;

  default:
    $node->$target = $value;
  }
  return;

}
}

/**
* Implementation of hook_nodeapi().
* @param object $node
* @param string $op
* @return void
*/
function uc_feeds_nodeapi(&$node, $op) {
if (!$node->uc_feeds_flag == 'Attributes') {
return;
}
switch ($op) {
case 'insert':
if (module_exists('uc_attribute')) {
foreach ($node->attributes as $aid => $feedattrib) {
// Enable all options for added attributes.
$attribute = uc_attribute_load($aid);
foreach ($attribute->options as $option) {
if ($node->attributes[$aid]->options[$option->oid]) {
$option->price = $node->attributes[$aid]->options[$option->oid]->price;
$option->weight = $node->attributes[$aid]->options[$option->oid]->weight;
}
db_query("INSERT INTO {uc_product_options} (nid, oid, cost, price, weight, ordering) VALUES (%d, %d, %f, %f, %f, %d)", $node->nid, $option->oid, $option->cost, $option->price, $option->weight, $option->ordering);
}
// Make the first option (if any) the default.
$option = reset($attribute->options);
if ($option) {
$oid = $option->oid;
}
else {
$oid = 0;
}
db_query("INSERT INTO {uc_product_attributes} (nid, aid, label, ordering, default_option, required, display) SELECT %d, aid, label, ordering, %d, required, display FROM {uc_attributes} WHERE aid = %d", $node->nid, $oid, $aid);
}
}
break;
case 'update':
uc_stock_adjust($node->model, $node->stock);
break;
}
}