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<?php /** * Provides logging capabilities for debugging purposes. * * @class KKART_Logger * @version 2.0.0 * @package Kkart\Classes */ use Automattic\Jetpack\Constants; defined( 'ABSPATH' ) || exit; /** * KKART_Logger class. */ class KKART_Logger implements KKART_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 'kkart_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 KKART_LOG_THRESHOLD. By default, all logs will be processed. */ public function __construct( $handlers = null, $threshold = null ) { if ( null === $handlers ) { $handlers = apply_filters( 'kkart_register_log_handlers', array() ); } $register_handlers = array(); if ( ! empty( $handlers ) && is_array( $handlers ) ) { foreach ( $handlers as $handler ) { $implements = class_implements( $handler ); if ( is_object( $handler ) && is_array( $implements ) && in_array( 'KKART_Log_Handler_Interface', $implements, true ) ) { $register_handlers[] = $handler; } else { kkart_doing_it_wrong( __METHOD__, sprintf( /* translators: 1: class name 2: KKART_Log_Handler_Interface */ __( 'The provided handler %1$s does not implement %2$s.', 'kkart' ), '<code>' . esc_html( is_object( $handler ) ? get_class( $handler ) : $handler ) . '</code>', '<code>KKART_Log_Handler_Interface</code>' ), '3.0' ); } } } // Support the constant as long as a valid log level has been set for it. if ( null === $threshold ) { $threshold = Constants::get_constant( 'KKART_LOG_THRESHOLD' ); if ( null !== $threshold && ! KKART_Log_Levels::is_valid_level( $threshold ) ) { $threshold = null; } } if ( null !== $threshold ) { $threshold = KKART_Log_Levels::get_level_severity( $threshold ); } $this->handlers = $register_handlers; $this->threshold = $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 ( null === $this->threshold ) { return true; } return $this->threshold <= KKART_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 = KKART_Log_Levels::NOTICE ) { $message = apply_filters( 'kkart_logger_add_message', $message, $handle ); $this->log( $level, $message, array( 'source' => $handle, '_legacy' => true, ) ); 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. */ public function log( $level, $message, $context = array() ) { if ( ! KKART_Log_Levels::is_valid_level( $level ) ) { /* translators: 1: KKART_Logger::log 2: level */ kkart_doing_it_wrong( __METHOD__, sprintf( __( '%1$s was called with an invalid level "%2$s".', 'kkart' ), '<code>KKART_Logger::log</code>', $level ), '3.0' ); } if ( $this->should_handle( $level ) ) { $timestamp = current_time( 'timestamp', 1 ); $message = apply_filters( 'kkart_logger_log_message', $message, $level, $context ); foreach ( $this->handlers as $handler ) { $handler->handle( $timestamp, $level, $message, $context ); } } } /** * Adds an emergency level message. * * System is unusable. * * @see KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function emergency( $message, $context = array() ) { $this->log( KKART_Log_Levels::EMERGENCY, $message, $context ); } /** * Adds an alert level message. * * Action must be taken immediately. * Example: Entire website down, database unavailable, etc. * * @see KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function alert( $message, $context = array() ) { $this->log( KKART_Log_Levels::ALERT, $message, $context ); } /** * Adds a critical level message. * * Critical conditions. * Example: Application component unavailable, unexpected exception. * * @see KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function critical( $message, $context = array() ) { $this->log( KKART_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 KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function error( $message, $context = array() ) { $this->log( KKART_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 KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function warning( $message, $context = array() ) { $this->log( KKART_Log_Levels::WARNING, $message, $context ); } /** * Adds a notice level message. * * Normal but significant events. * * @see KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function notice( $message, $context = array() ) { $this->log( KKART_Log_Levels::NOTICE, $message, $context ); } /** * Adds a info level message. * * Interesting events. * Example: User logs in, SQL logs. * * @see KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function info( $message, $context = array() ) { $this->log( KKART_Log_Levels::INFO, $message, $context ); } /** * Adds a debug level message. * * Detailed debug information. * * @see KKART_Logger::log * * @param string $message Message to log. * @param array $context Log context. */ public function debug( $message, $context = array() ) { $this->log( KKART_Log_Levels::DEBUG, $message, $context ); } /** * Clear entries for a chosen file/source. * * @param string $source Source/handle to clear. * @return bool */ public function clear( $source = '' ) { if ( ! $source ) { return false; } foreach ( $this->handlers as $handler ) { if ( is_callable( array( $handler, 'clear' ) ) ) { $handler->clear( $source ); } } return true; } /** * Clear all logs older than a defined number of days. Defaults to 30 days. * * @since 3.4.0 */ public function clear_expired_logs() { $days = absint( apply_filters( 'kkart_logger_days_to_retain_logs', 30 ) ); $timestamp = strtotime( "-{$days} days" ); foreach ( $this->handlers as $handler ) { if ( is_callable( array( $handler, 'delete_logs_before_timestamp' ) ) ) { $handler->delete_logs_before_timestamp( $timestamp ); } } } }
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