DataSourcePoller.php
<?php
namespace Automattic\WooCommerce\Admin;
/**
* Specs data source poller class.
* This handles polling specs from JSON endpoints, and
* stores the specs in to the database as an option.
*/
abstract class DataSourcePoller {
/**
* Get class instance.
*/
abstract public static function get_instance();
/**
* Name of data sources filter.
*/
const FILTER_NAME = 'data_source_poller_data_sources';
/**
* Name of data source specs filter.
*/
const FILTER_NAME_SPECS = 'data_source_poller_specs';
/**
* Id of DataSourcePoller.
*
* @var string
*/
protected $id = array();
/**
* Default data sources array.
*
* @var array
*/
protected $data_sources = array();
/**
* Default args.
*
* @var array
*/
protected $args = array();
/**
* The logger instance.
*
* @var WC_Logger|null
*/
protected static $logger = null;
/**
* Constructor.
*
* @param string $id id of DataSourcePoller.
* @param array $data_sources urls for data sources.
* @param array $args Options for DataSourcePoller.
*/
public function __construct( $id, $data_sources = array(), $args = array() ) {
$this->data_sources = $data_sources;
$this->id = $id;
$arg_defaults = array(
'spec_key' => 'id',
'transient_name' => 'woocommerce_admin_' . $id . '_specs',
'transient_expiry' => 7 * DAY_IN_SECONDS,
);
$this->args = wp_parse_args( $args, $arg_defaults );
}
/**
* Get the logger instance.
*
* @return WC_Logger
*/
protected static function get_logger() {
if ( is_null( self::$logger ) ) {
self::$logger = wc_get_logger();
}
return self::$logger;
}
/**
* Returns the key identifier of spec, this can easily be overwritten. Defaults to id.
*
* @param mixed $spec a JSON parsed spec coming from the JSON feed.
* @return string|boolean
*/
protected function get_spec_key( $spec ) {
$key = $this->args['spec_key'];
if ( isset( $spec->$key ) ) {
return $spec->$key;
}
return false;
}
/**
* Reads the data sources for specs and persists those specs.
*
* @return array list of specs.
*/
public function get_specs_from_data_sources() {
$locale = get_user_locale();
$specs_group = get_transient( $this->args['transient_name'] ) ?? array();
$specs = isset( $specs_group[ $locale ] ) ? $specs_group[ $locale ] : array();
if ( ! is_array( $specs ) || empty( $specs ) ) {
$this->read_specs_from_data_sources();
$specs_group = get_transient( $this->args['transient_name'] );
$specs = isset( $specs_group[ $locale ] ) ? $specs_group[ $locale ] : array();
}
$specs = apply_filters( self::FILTER_NAME_SPECS, $specs, $this->id );
return $specs !== false ? $specs : array();
}
/**
* Reads the data sources for specs and persists those specs.
*
* @return bool Whether any specs were read.
*/
public function read_specs_from_data_sources() {
$specs = array();
$data_sources = apply_filters( self::FILTER_NAME, $this->data_sources, $this->id );
// Note that this merges the specs from the data sources based on the
// id - last one wins.
foreach ( $data_sources as $url ) {
$specs_from_data_source = self::read_data_source( $url );
$this->merge_specs( $specs_from_data_source, $specs, $url );
}
$specs_group = get_transient( $this->args['transient_name'] ) ?? array();
$locale = get_user_locale();
$specs_group[ $locale ] = $specs;
// Persist the specs as a transient.
set_transient(
$this->args['transient_name'],
$specs_group,
$this->args['transient_expiry']
);
return count( $specs ) !== 0;
}
/**
* Delete the specs transient.
*
* @return bool success of failure of transient deletion.
*/
public function delete_specs_transient() {
return delete_transient( $this->args['transient_name'] );
}
/**
* Read a single data source and return the read specs
*
* @param string $url The URL to read the specs from.
*
* @return array The specs that have been read from the data source.
*/
protected static function read_data_source( $url ) {
$logger_context = array( 'source' => $url );
$logger = self::get_logger();
$response = wp_remote_get(
add_query_arg(
'locale',
get_user_locale(),
$url
),
array(
'user-agent' => 'WooCommerce/' . WC_VERSION . '; ' . home_url( '/' ),
)
);
if ( is_wp_error( $response ) || ! isset( $response['body'] ) ) {
$logger->error(
'Error getting data feed',
$logger_context
);
// phpcs:ignore
$logger->error( print_r( $response, true ), $logger_context );
return [];
}
$body = $response['body'];
$specs = json_decode( $body );
if ( $specs === null ) {
$logger->error(
'Empty response in data feed',
$logger_context
);
return [];
}
if ( ! is_array( $specs ) ) {
$logger->error(
'Data feed is not an array',
$logger_context
);
return [];
}
return $specs;
}
/**
* Merge the specs.
*
* @param Array $specs_to_merge_in The specs to merge in to $specs.
* @param Array $specs The list of specs being merged into.
* @param string $url The url of the feed being merged in (for error reporting).
*/
protected function merge_specs( $specs_to_merge_in, &$specs, $url ) {
foreach ( $specs_to_merge_in as $spec ) {
if ( ! $this->validate_spec( $spec, $url ) ) {
continue;
}
$id = $this->get_spec_key( $spec );
$specs[ $id ] = $spec;
}
}
/**
* Validate the spec.
*
* @param object $spec The spec to validate.
* @param string $url The url of the feed that provided the spec.
*
* @return bool The result of the validation.
*/
protected function validate_spec( $spec, $url ) {
$logger = self::get_logger();
$logger_context = array( 'source' => $url );
if ( ! $this->get_spec_key( $spec ) ) {
$logger->error(
'Spec is invalid because the id is missing in feed',
$logger_context
);
// phpcs:ignore
$logger->error( print_r( $spec, true ), $logger_context );
return false;
}
return true;
}
}
