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✏️ Editing: class-wc-logger.php

<?php
/**
 * Provides logging capabilities for debugging purposes.
 *
 * @class          WC_Logger
 * @version        2.0.0
 * @package        WooCommerce\Classes
 */

use Automattic\WooCommerce\Utilities\LoggingUtil;

defined( 'ABSPATH' ) || exit;

/**
 * WC_Logger class.
 */
class WC_Logger implements WC_Logger_Interface {
	/**
	 * Stores registered log handlers.
	 *
	 * @var array
	 */
	protected $handlers;

/**
	 * Minimum log level this handler will process.
	 *
	 * @var int Integer representation of minimum log level to handle.
	 */
	protected $threshold;

/**
	 * 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;
		} else {
			$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[]
			 *
			 * @since 3.0.0
			 */
			$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[] = $handler;
				} else {
					wc_doing_it_wrong(
						__METHOD__,
						sprintf(
							/* translators: 1: class name 2: WC_Log_Handler_Interface */
							__( 'The provided handler %1$s does not implement %2$s.', 'woocommerce' ),
							'<code>' . esc_html( is_object( $handler ) ? get_class( $handler ) : $handler ) . '</code>',
							'<code>WC_Log_Handler_Interface</code>'
						),
						'3.0'
					);
				}
			}
		}

return $registered_handlers;
	}

/**
	 * Get the log threshold as a numerical level severity.
	 *
	 * @return int
	 */
	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() ) {
			return false;
		}

$threshold = $this->get_threshold();

return $threshold <= WC_Log_Levels::get_level_severity( $level );
	}

/**
	 * Add a log entry.
	 *
	 * 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.
	 * @return bool
	 */
	public function add( $handle, $message, $level = WC_Log_Levels::NOTICE ) {
		$message = apply_filters( 'woocommerce_logger_add_message', $message, $handle );
		$this->log(
			$level,
			$message,
			array(
				'source'  => $handle,
				'_legacy' => true,
			)
		);
		wc_do_deprecated_action( 'woocommerce_log_add', array( $handle, $message ), '3.0', 'This action has been deprecated with no alternative.' );
		return true;
	}

/**
	 * Add a log entry.
	 *
	 * @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.
	 *
	 * @return void
	 */
	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 ) ) {
			$timestamp = time();

foreach ( $this->get_handlers() as $handler ) {
				/**
				 * Filter the logging message. Returning null will prevent logging from occurring since 5.3.
				 *
				 * @since 3.1
				 * @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.
	 *
	 * System is unusable.
	 *
	 * @see WC_Logger::log
	 *
	 * @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.
	 *
	 * @see WC_Logger::log
	 *
	 * @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.
	 *
	 * Critical conditions.
	 * Example: Application component unavailable, unexpected exception.
	 *
	 * @see WC_Logger::log
	 *
	 * @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
	 * and monitored.
	 *
	 * @see WC_Logger::log
	 *
	 * @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
	 * necessarily wrong.
	 *
	 * @see WC_Logger::log
	 *
	 * @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.
	 *
	 * @see WC_Logger::log
	 *
	 * @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.
	 *
	 * Interesting events.
	 * Example: User logs in, SQL logs.
	 *
	 * @see WC_Logger::log
	 *
	 * @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.
	 *
	 * @see WC_Logger::log
	 *
	 * @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.
	 * @return bool
	 */
	public function clear( $source = '', $quiet = false ) {
		if ( ! $source ) {
			return false;
		}

foreach ( $this->get_handlers() as $handler ) {
			if ( $handler instanceof WC_Log_Handler && is_callable( array( $handler, 'clear' ) ) ) {
				$handler->clear( $source, $quiet );
			}
		}

return true;
	}

/**
	 * Clear all logs older than a defined number of days. Defaults to 30 days.
	 *
	 * @return void
	 */
	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 );
			}
		}
	}
}

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