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<?php
/**
* Provides logging capabilities for debugging purposes.
*
* @class ANALYTIFY_Logger
* @version 1.0.0
* @package Analytify/Classes
*/
defined( 'ABSPATH' ) || exit;
/**
* ANALYTIFY_Logger class.
*/
class ANALYTIFY_Logger implements ANALYTIFY_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 'analytify_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 ANALYTIFY_LOG_THRESHOLD. By default, all logs will be processed.
*/
public function __construct( $handlers = null, $threshold = null ) {
if ( null === $handlers ) {
$handlers = apply_filters( 'analytify_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( 'ANALYTIFY_Log_Handler_Interface', $implements, true ) ) {
$register_handlers[] = $handler;
}
}
}
if ( null !== $threshold ) {
$threshold = ANALYTIFY_Log_Levels::get_level_severity( $threshold );
} elseif ( defined( 'ANALYTIFY_LOG_THRESHOLD' ) && ANALYTIFY_Log_Levels::is_valid_level( ANALYTIFY_LOG_THRESHOLD ) ) {
$threshold = ANALYTIFY_Log_Levels::get_level_severity( ANALYTIFY_LOG_THRESHOLD );
} else {
$threshold = null;
}
$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 <= ANALYTIFY_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 = ANALYTIFY_Log_Levels::NOTICE ) {
$message = apply_filters( 'analytify_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 ( ! ANALYTIFY_Log_Levels::is_valid_level( $level ) ) {
_doing_it_wrong( __METHOD__, sprintf( __( '%1$s was called with an invalid level "%2$s".', 'wp-analytify' ), '<code>ANALYTIFY_Logger::log</code>', $level ), '3.0' );
}
if ( $this->should_handle( $level ) ) {
$timestamp = current_time( 'timestamp' );
$message = apply_filters( 'analytify_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 ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function emergency( $message, $context = array() ) {
$this->log( ANALYTIFY_Log_Levels::EMERGENCY, $message, $context );
}
/**
* Adds an alert level message.
*
* Action must be taken immediately.
* Example: Entire website down, database unavailable, etc.
*
* @see ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function alert( $message, $context = array() ) {
$this->log( ANALYTIFY_Log_Levels::ALERT, $message, $context );
}
/**
* Adds a critical level message.
*
* Critical conditions.
* Example: Application component unavailable, unexpected exception.
*
* @see ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function critical( $message, $context = array() ) {
$this->log( ANALYTIFY_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 ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function error( $message, $context = array() ) {
$this->log( ANALYTIFY_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 ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function warning( $message, $context = array() ) {
$this->log( ANALYTIFY_Log_Levels::WARNING, $message, $context );
}
/**
* Adds a notice level message.
*
* Normal but significant events.
*
* @see ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function notice( $message, $context = array() ) {
$this->log( ANALYTIFY_Log_Levels::NOTICE, $message, $context );
}
/**
* Adds a info level message.
*
* Interesting events.
* Example: User logs in, SQL logs.
*
* @see ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function info( $message, $context = array() ) {
$this->log( ANALYTIFY_Log_Levels::INFO, $message, $context );
}
/**
* Adds a debug level message.
*
* Detailed debug information.
*
* @see ANALYTIFY_Logger::log
*
* @param string $message Message to log.
* @param array $context Log context.
*/
public function debug( $message, $context = array() ) {
$this->log( ANALYTIFY_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( 'analytify_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 );
}
}
}
}