* Provides logging capabilities for debugging purposes.
* @package WooCommerce\Classes
use Automattic\WooCommerce\Utilities\LoggingUtil;
defined( 'ABSPATH' ) || exit;
class WC_Logger implements WC_Logger_Interface {
* Stores registered log handlers.
* Minimum log level this handler will process.
* @var int Integer representation of minimum log level to handle.
* Constructor for the logger.
* @param array $handlers Optional. Array of log handlers. If $handlers is not provided, the filter 'woocommerce_register_log_handlers' will be used to define the handlers. If $handlers is provided, the filter will not be applied and the handlers will be used directly.
* @param string $threshold Optional. Define an explicit threshold. May be configured via WC_LOG_THRESHOLD. By default, all logs will be processed.
public function __construct( $handlers = null, $threshold = null ) {
if ( is_array( $handlers ) ) {
$this->handlers = $handlers;
if ( is_string( $threshold ) ) {
$this->threshold = $threshold;
* Get an array of log handler instances.
* @return WC_Log_Handler_Interface[]
protected function get_handlers() {
if ( ! is_null( $this->handlers ) ) {
$handlers = $this->handlers;
$default_handler = LoggingUtil::get_default_handler();
$handler_instance = new $default_handler();
* Filter the list of log handler class instances that will run whenever a log entry is added.
* @param WC_Log_Handler_Interface[]
$handlers = apply_filters( 'woocommerce_register_log_handlers', array( $handler_instance ) );
$registered_handlers = array();
if ( ! empty( $handlers ) && is_array( $handlers ) ) {
foreach ( $handlers as $handler ) {
if ( $handler instanceof WC_Log_Handler_Interface ) {
$registered_handlers[] = $handler;
/* translators: 1: class name 2: WC_Log_Handler_Interface */
__( 'The provided handler %1$s does not implement %2$s.', 'woocommerce' ),
'<code>' . esc_html( is_object( $handler ) ? get_class( $handler ) : $handler ) . '</code>',
'<code>WC_Log_Handler_Interface</code>'
return $registered_handlers;
* Get the log threshold as a numerical level severity.
protected function get_threshold() {
$threshold = $this->threshold;
if ( ! WC_Log_Levels::is_valid_level( $threshold ) ) {
$threshold = LoggingUtil::get_level_threshold();
return WC_Log_Levels::get_level_severity( $threshold );
* Determine whether to handle or ignore log.
* @param string $level emergency|alert|critical|error|warning|notice|info|debug.
* @return bool True if the log should be handled.
protected function should_handle( $level ) {
if ( ! LoggingUtil::logging_is_enabled() ) {
$threshold = $this->get_threshold();
return $threshold <= WC_Log_Levels::get_level_severity( $level );
* This is not the preferred method for adding log messages. Please use log() or any one of
* the level methods (debug(), info(), etc.). This method may be deprecated in the future.
* @param string $handle File handle.
* @param string $message Message to log.
* @param string $level Logging level.
public function add( $handle, $message, $level = WC_Log_Levels::NOTICE ) {
$message = apply_filters( 'woocommerce_logger_add_message', $message, $handle );
wc_do_deprecated_action( 'woocommerce_log_add', array( $handle, $message ), '3.0', 'This action has been deprecated with no alternative.' );
* @param string $level One of the following:
* 'emergency': System is unusable.
* 'alert': Action must be taken immediately.
* 'critical': Critical conditions.
* 'error': Error conditions.
* 'warning': Warning conditions.
* 'notice': Normal but significant condition.
* 'info': Informational messages.
* 'debug': Debug-level messages.
* @param string $message Log message.
* @param array $context Optional. Additional information for log handlers.
public function log( $level, $message, $context = array() ) {
if ( ! WC_Log_Levels::is_valid_level( $level ) ) {
/* translators: 1: WC_Logger::log 2: level */
wc_doing_it_wrong( __METHOD__, sprintf( __( '%1$s was called with an invalid level "%2$s".', 'woocommerce' ), '<code>WC_Logger::log</code>', $level ), '3.0' );
if ( $this->should_handle( $level ) ) {
foreach ( $this->get_handlers() as $handler ) {
* Filter the logging message. Returning null will prevent logging from occurring since 5.3.
* @param string $message Log message.
* @param string $level One of: emergency, alert, critical, error, warning, notice, info, or debug.
* @param array $context Additional information for log handlers.
* @param object $handler The handler object, such as WC_Log_Handler_File. Available since 5.3.
$filtered_message = apply_filters( 'woocommerce_logger_log_message', $message, $level, $context, $handler );
if ( null !== $filtered_message ) {
$handler->handle( $timestamp, $level, $filtered_message, $context );
* Adds an emergency level message.
* @param string $message Message to log.
* @param array $context Log context.
public function emergency( $message, $context = array() ) {
$this->log( WC_Log_Levels::EMERGENCY, $message, $context );
* Adds an alert level message.
* Action must be taken immediately.
* Example: Entire website down, database unavailable, etc.
* @param string $message Message to log.
* @param array $context Log context.
public function alert( $message, $context = array() ) {
$this->log( WC_Log_Levels::ALERT, $message, $context );
* Adds a critical level message.
* Example: Application component unavailable, unexpected exception.
* @param string $message Message to log.
* @param array $context Log context.
public function critical( $message, $context = array() ) {
$this->log( WC_Log_Levels::CRITICAL, $message, $context );
* Adds an error level message.
* Runtime errors that do not require immediate action but should typically be logged
* @param string $message Message to log.
* @param array $context Log context.
public function error( $message, $context = array() ) {
$this->log( WC_Log_Levels::ERROR, $message, $context );
* Adds a warning level message.
* Exceptional occurrences that are not errors.
* Example: Use of deprecated APIs, poor use of an API, undesirable things that are not
* @param string $message Message to log.
* @param array $context Log context.
public function warning( $message, $context = array() ) {
$this->log( WC_Log_Levels::WARNING, $message, $context );
* Adds a notice level message.
* Normal but significant events.
* @param string $message Message to log.
* @param array $context Log context.
public function notice( $message, $context = array() ) {
$this->log( WC_Log_Levels::NOTICE, $message, $context );
* Adds a info level message.
* Example: User logs in, SQL logs.
* @param string $message Message to log.
* @param array $context Log context.
public function info( $message, $context = array() ) {
$this->log( WC_Log_Levels::INFO, $message, $context );
* Adds a debug level message.
* Detailed debug information.
* @param string $message Message to log.
* @param array $context Log context.
public function debug( $message, $context = array() ) {
$this->log( WC_Log_Levels::DEBUG, $message, $context );
* Clear entries for a chosen file/source.
* @param string $source Source/handle to clear.
* @param bool $quiet Whether to suppress the deletion message.
public function clear( $source = '', $quiet = false ) {
foreach ( $this->get_handlers() as $handler ) {
if ( is_callable( array( $handler, 'clear' ) ) ) {
$handler->clear( $source, $quiet );
* Clear all logs older than a defined number of days. Defaults to 30 days.
public function clear_expired_logs() {
$days = LoggingUtil::get_retention_period();
$timestamp = strtotime( "-{$days} days" );
foreach ( $this->get_handlers() as $handler ) {
if ( is_callable( array( $handler, 'delete_logs_before_timestamp' ) ) ) {
$handler->delete_logs_before_timestamp( $timestamp );
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
