/**
* Performs the API request and sets the cache.
*
* @return string The response string of xml.
* @access public
* @remark The scope is public since the cache renewal event also uses it.
*/
public function setAPIRequestCache($sRequestURI, $aHTTPArgs, $sTransientID = '', $iDuration = 0)
{
// Perform the API request.
$_asXMLResponse = $this->requestSigned($sRequestURI, $aHTTPArgs);
// If it has a HTTP connection error, an array is returned.
if (is_array($_asXMLResponse)) {
return $_asXMLResponse;
}
// If it's not a string, something went wrong.
if (!is_string($_asXMLResponse)) {
return $_asXMLResponse;
}
$_boXML = AmazonAutoLinks_WPUtility::getXMLObject($_asXMLResponse);
// If it's not a valid XML, it returns false.
if (!is_object($_boXML)) {
return array('Error' => array('Message' => strip_tags($_asXMLResponse), 'Code' => 'Invalid XML'));
}
$aResponse = AmazonAutoLinks_WPUtility::convertXMLtoArray($_boXML);
// If empty, return an empty array.
if (empty($aResponse)) {
return array();
}
// If the result is not an array, something went wrong.
if (!is_array($aResponse)) {
return (array) $aResponse;
}
// If an error occurs, do not set the cache.
if (isset($aResponse['Error'])) {
return $aResponse;
}
// Save the cache
$sTransientID = empty($sTransientID) ? AmazonAutoLinks_Registry::TRANSIENT_PREFIX . "_" . md5(trim($sRequestURI)) : $sTransientID;
$this->setCache($sTransientID, $_asXMLResponse, $iDuration, $sRequestURI);
return $_asXMLResponse;
}
