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File: engine/class.www-logger.php

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File: engine/class.www-logger.php
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Description: Logger Class
Class: Wave Framework
MVC framework for building Web sites and APIs
Author: By
Last change: Updated jQuery 1.10.0 and 2.0.1. Added better API versioning support that also takes into account overrides folders. Refactoring of Imager class to reduce duplicate code between Image Handler and Imager. Also fixed the bug introduced in 3.6.2 that generated incorrect image sprite sizes in dynamic image loading. Code review and some minor changes.
Date: 9 years ago
Size: 8,123 bytes


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 * Wave Framework <>
 * Logger Class
 * This is an optional class that is used to log requests on system by Index Gateway. WWW_Logger
 * is used to keep track of performance of requests made to Index Gateway files, it keeps track
 * of how long the request took, what data it included, how high was the memory use, server load,
 * CPU usage and so on. If this logger is used, then every single request is logged as serialized
 * arrays in filesystem in /filesystem/log/ subfolders. It is a good idea to clean that folder
 * every now and then. There is a separate log-reader.php script for reading those log files
 * situated in /tools/ subfolder.
 * @package Logger
 * @author Kristo Vaher <>
 * @copyright Copyright (c) 2012, Kristo Vaher
 * @license GNU Lesser General Public License Version 3
 * @tutorial /doc/pages/logger.htm
 * @since 1.0.0
 * @version 3.6.4

class WWW_Logger {

     * This stores microtime of the request at the moment Logger object was created. This
     * microtime is used by Logger to calculate execution time of the script. If this value
     * is not defined at the moment Logger object is created, then it is defined automatically.
private $requestMicrotime=false;
     * This is the main address of the folder where log files will be stored. This folder
     * should be writable by PHP. Logger creates subfolders under this folder and stores log
     * files in those subfolders.
private $logDir='./';
     * This array variable stores custom data sent to logger. Keys of this array will be stored
     * as keys in the log entry.
public $logData=array('response-code'=>200);
     * Construction method of Logger requires just one variable: $logDir, which is the folder
     * where log files will be stored. Second variable, $microTime, is used to calculate the
     * execution time of the script. This microtime should be the microtime from the very start
     * of the script, if it is not defined then Logger defines it by itself.
     * @param string $logDir location of directory to store log files at
     * @param boolean|float $microTime starting microtime
     * @return WWW_Logger
public function __construct($logDir='./',$microTime=false){
// Defining IP
// We record the start time of the request
        } else {
// Checking if log directory is valid
// Log directory is assigned
        } else {
// Assigned folder is not detected as being a folder
trigger_error('Assigned log folder does not exist or is not writable',E_USER_ERROR);
     * This method is used to add data to objects $logData array. Key will be the same key defined
     * in the log entry array and value will be the value of this key. It is also possible to send
     * multiple keys and values in the same method, if $key is an array of keys and values, instead
     * of a string.
     * @param string|array $key single key or array of log keys and values
     * @param boolean|string $value this is the value written to the log
     * @return boolean
public function setCustomLogData($key,$value=true){
// Log data can be sent as an array
        } else {
     * This is the main method of Logger. This method attempts to gather a lot of data about the
     * HTTP request and calculate things such as execution time, memory usage and more. It also
     * creates a logger entry array and combines it with custom log array of $logData. It also
     * creates subfolder in the log folder directory, if it doesn't exist, and writes serialized
     * log entry array in that folder.
     * @return boolean
public function writeLog(){
// All log data is gathered to this variable
            // Unique request identifier set by the server (this is not supported on Windows and Nginx servers)
if(isset($_SERVER['UNIQUE_ID'])){ $logData['request-id']=$_SERVER['UNIQUE_ID']; }
// This stores the URI that user agent requested.
// Timestamp of the request in milliseconds.
// UNIX timestamp of the request time.
// Stores request datetime in format 'Y-m-d H:i:s'.
$logData['datetime']=date('Y-m-d H:i:s').' GMT '.date('P');
// Stores IP of the user agent that made the request.
// Additional IP's
// This stores user agent string of the user agent.
// This stores user agent string of the user agent.
// GET variables submitted by user agent.
// POST variables submitted by user agent
// Checking for HTTP input
// FILES variables submitted by user agent
// COOKIE variables submitted by user agent
// This stores how long the request took in seconds.
// This stores the peak usage of memory during the request.
$logData['memory-peak-usage']=memory_get_peak_usage(); // In bytes, divide by 1048576 to get megabytes

            // CPU load - This is not available on Windows
// Disregarding potentially incorrectly reported numbers
// Disregarding potentially incorrectly reported numbers
// This stores system load number (that is one minute old).
            // This is not supported on Windows
$load=sys_getloadavg(); //last 1, 5 and 15 minutes (number of processes in run queue)
            // Log filename is current time-based with present hour in the end
// Finding the subfolder of the log file, if subfolder does not exist then it is created
trigger_error('Cannot create log folder',E_USER_ERROR);
// Appending the log data at the end of log file or creating it if it does not exist
trigger_error('Cannot write log file',E_USER_ERROR);
// Logging process is finished
return true;

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