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825 lines
25 KiB
PHP
825 lines
25 KiB
PHP
<?php
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/**
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* $Header: /repository/pear/Log/Log.php,v 1.64 2006/10/08 23:03:15 jon Exp $
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* $Horde: horde/lib/Log.php,v 1.15 2000/06/29 23:39:45 jon Exp $
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*
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* @version $Revision: 1.64 $
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* @package Log
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*/
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define('PEAR_LOG_EMERG', 0); /** System is unusable */
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define('PEAR_LOG_ALERT', 1); /** Immediate action required */
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define('PEAR_LOG_CRIT', 2); /** Critical conditions */
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define('PEAR_LOG_ERR', 3); /** Error conditions */
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define('PEAR_LOG_WARNING', 4); /** Warning conditions */
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define('PEAR_LOG_NOTICE', 5); /** Normal but significant */
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define('PEAR_LOG_INFO', 6); /** Informational */
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define('PEAR_LOG_DEBUG', 7); /** Debug-level messages */
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define('PEAR_LOG_ALL', bindec('11111111')); /** All messages */
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define('PEAR_LOG_NONE', bindec('00000000')); /** No message */
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/* Log types for PHP's native error_log() function. */
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define('PEAR_LOG_TYPE_SYSTEM', 0); /** Use PHP's system logger */
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define('PEAR_LOG_TYPE_MAIL', 1); /** Use PHP's mail() function */
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define('PEAR_LOG_TYPE_DEBUG', 2); /** Use PHP's debugging connection */
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define('PEAR_LOG_TYPE_FILE', 3); /** Append to a file */
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/**
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* The Log:: class implements both an abstraction for various logging
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* mechanisms and the Subject end of a Subject-Observer pattern.
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*
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* @author Chuck Hagenbuch <chuck@horde.org>
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* @author Jon Parise <jon@php.net>
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* @since Horde 1.3
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* @package Log
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*/
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class Log
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{
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/**
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* Indicates whether or not the log can been opened / connected.
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*
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* @var boolean
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* @access private
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*/
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var $_opened = false;
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/**
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* Instance-specific unique identification number.
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*
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* @var integer
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* @access private
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*/
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var $_id = 0;
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/**
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* The label that uniquely identifies this set of log messages.
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*
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* @var string
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* @access private
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*/
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var $_ident = '';
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/**
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* The default priority to use when logging an event.
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*
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* @var integer
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* @access private
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*/
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var $_priority = PEAR_LOG_INFO;
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/**
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* The bitmask of allowed log levels.
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*
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* @var integer
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* @access private
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*/
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var $_mask = PEAR_LOG_ALL;
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/**
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* Holds all Log_observer objects that wish to be notified of new messages.
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*
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* @var array
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* @access private
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*/
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var $_listeners = array();
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/**
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* Maps canonical format keys to position arguments for use in building
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* "line format" strings.
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*
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* @var array
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* @access private
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*/
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var $_formatMap = array('%{timestamp}' => '%1$s',
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'%{ident}' => '%2$s',
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'%{priority}' => '%3$s',
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'%{message}' => '%4$s',
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'%{file}' => '%5$s',
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'%{line}' => '%6$s',
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'%{function}' => '%7$s',
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'%\{' => '%%{');
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/**
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* Attempts to return a concrete Log instance of type $handler.
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*
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* @param string $handler The type of concrete Log subclass to return.
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* Attempt to dynamically include the code for
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* this subclass. Currently, valid values are
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* 'console', 'syslog', 'sql', 'file', and 'mcal'.
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*
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* @param string $name The name of the actually log file, table, or
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* other specific store to use. Defaults to an
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* empty string, with which the subclass will
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* attempt to do something intelligent.
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*
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* @param string $ident The identity reported to the log system.
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*
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* @param array $conf A hash containing any additional configuration
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* information that a subclass might need.
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*
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* @param int $level Log messages up to and including this level.
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*
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* @return object Log The newly created concrete Log instance, or
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* null on an error.
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* @access public
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* @since Log 1.0
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*/
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function &factory($handler, $name = '', $ident = '', $conf = array(),
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$level = PEAR_LOG_DEBUG)
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{
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$handler = strtolower($handler);
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$class = 'Log_' . $handler;
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$classfile = 'Log/' . $handler . '.php';
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/*
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* Attempt to include our version of the named class, but don't treat
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* a failure as fatal. The caller may have already included their own
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* version of the named class.
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*/
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if (!class_exists($class)) {
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include_once $classfile;
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}
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/* If the class exists, return a new instance of it. */
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if (class_exists($class)) {
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$obj = &new $class($name, $ident, $conf, $level);
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return $obj;
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}
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$null = null;
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return $null;
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}
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/**
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* Attempts to return a reference to a concrete Log instance of type
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* $handler, only creating a new instance if no log instance with the same
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* parameters currently exists.
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*
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* You should use this if there are multiple places you might create a
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* logger, you don't want to create multiple loggers, and you don't want to
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* check for the existance of one each time. The singleton pattern does all
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* the checking work for you.
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*
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* <b>You MUST call this method with the $var = &Log::singleton() syntax.
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* Without the ampersand (&) in front of the method name, you will not get
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* a reference, you will get a copy.</b>
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*
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* @param string $handler The type of concrete Log subclass to return.
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* Attempt to dynamically include the code for
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* this subclass. Currently, valid values are
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* 'console', 'syslog', 'sql', 'file', and 'mcal'.
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*
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* @param string $name The name of the actually log file, table, or
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* other specific store to use. Defaults to an
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* empty string, with which the subclass will
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* attempt to do something intelligent.
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*
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* @param string $ident The identity reported to the log system.
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*
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* @param array $conf A hash containing any additional configuration
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* information that a subclass might need.
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*
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* @param int $level Log messages up to and including this level.
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*
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* @return object Log The newly created concrete Log instance, or
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* null on an error.
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* @access public
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* @since Log 1.0
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*/
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function &singleton($handler, $name = '', $ident = '', $conf = array(),
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$level = PEAR_LOG_DEBUG)
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{
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static $instances;
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if (!isset($instances)) $instances = array();
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$signature = serialize(array($handler, $name, $ident, $conf, $level));
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if (!isset($instances[$signature])) {
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$instances[$signature] = &Log::factory($handler, $name, $ident,
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$conf, $level);
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}
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return $instances[$signature];
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}
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/**
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* Abstract implementation of the open() method.
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* @since Log 1.0
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*/
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function open()
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{
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return false;
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}
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/**
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* Abstract implementation of the close() method.
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* @since Log 1.0
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*/
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function close()
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{
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return false;
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}
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/**
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* Abstract implementation of the flush() method.
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* @since Log 1.8.2
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*/
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function flush()
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{
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return false;
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}
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/**
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* Abstract implementation of the log() method.
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* @since Log 1.0
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*/
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function log($message, $priority = null)
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{
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return false;
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}
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/**
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* A convenience function for logging a emergency event. It will log a
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* message at the PEAR_LOG_EMERG log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function emerg($message)
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{
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return $this->log($message, PEAR_LOG_EMERG);
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}
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/**
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* A convenience function for logging an alert event. It will log a
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* message at the PEAR_LOG_ALERT log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function alert($message)
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{
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return $this->log($message, PEAR_LOG_ALERT);
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}
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/**
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* A convenience function for logging a critical event. It will log a
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* message at the PEAR_LOG_CRIT log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function crit($message)
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{
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return $this->log($message, PEAR_LOG_CRIT);
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}
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/**
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* A convenience function for logging a error event. It will log a
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* message at the PEAR_LOG_ERR log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function err($message)
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{
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return $this->log($message, PEAR_LOG_ERR);
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}
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/**
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* A convenience function for logging a warning event. It will log a
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* message at the PEAR_LOG_WARNING log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function warning($message)
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{
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return $this->log($message, PEAR_LOG_WARNING);
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}
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/**
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* A convenience function for logging a notice event. It will log a
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* message at the PEAR_LOG_NOTICE log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function notice($message)
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{
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return $this->log($message, PEAR_LOG_NOTICE);
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}
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/**
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* A convenience function for logging a information event. It will log a
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* message at the PEAR_LOG_INFO log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function info($message)
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{
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return $this->log($message, PEAR_LOG_INFO);
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}
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/**
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* A convenience function for logging a debug event. It will log a
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* message at the PEAR_LOG_DEBUG log level.
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*
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* @param mixed $message String or object containing the message
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* to log.
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*
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* @return boolean True if the message was successfully logged.
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*
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* @access public
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* @since Log 1.7.0
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*/
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function debug($message)
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{
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return $this->log($message, PEAR_LOG_DEBUG);
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}
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/**
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* Returns the string representation of the message data.
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*
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* If $message is an object, _extractMessage() will attempt to extract
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* the message text using a known method (such as a PEAR_Error object's
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* getMessage() method). If a known method, cannot be found, the
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* serialized representation of the object will be returned.
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*
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* If the message data is already a string, it will be returned unchanged.
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*
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* @param mixed $message The original message data. This may be a
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* string or any object.
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*
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* @return string The string representation of the message.
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*
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* @access private
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*/
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function _extractMessage($message)
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{
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/*
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* If we've been given an object, attempt to extract the message using
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* a known method. If we can't find such a method, default to the
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* "human-readable" version of the object.
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*
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* We also use the human-readable format for arrays.
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*/
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if (is_object($message)) {
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if (method_exists($message, 'getmessage')) {
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$message = $message->getMessage();
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} else if (method_exists($message, 'tostring')) {
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$message = $message->toString();
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} else if (method_exists($message, '__tostring')) {
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if (version_compare(PHP_VERSION, '5.0.0', 'ge')) {
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$message = (string)$message;
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} else {
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$message = $message->__toString();
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}
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} else {
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$message = print_r($message, true);
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}
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} else if (is_array($message)) {
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if (isset($message['message'])) {
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$message = $message['message'];
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} else {
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$message = print_r($message, true);
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}
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}
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/* Otherwise, we assume the message is a string. */
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return $message;
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}
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/**
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* Using debug_backtrace(), returns the file, line, and enclosing function
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* name of the source code context from which log() was invoked.
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*
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* @param int $depth The initial number of frames we should step
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* back into the trace.
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*
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* @return array Array containing three strings: the filename, the line,
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* and the function name from which log() was called.
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*
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* @access private
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* @since Log 1.9.4
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*/
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function _getBacktraceVars($depth)
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{
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/* Start by generating a backtrace from the current call (here). */
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$backtrace = debug_backtrace();
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/*
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* If we were ultimately invoked by the composite handler, we need to
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* increase our depth one additional level to compensate.
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*/
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if (strcasecmp(@$backtrace[$depth+1]['class'], 'Log_composite') == 0) {
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$depth++;
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}
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/*
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* We're interested in the frame which invoked the log() function, so
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* we need to walk back some number of frames into the backtrace. The
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* $depth parameter tells us where to start looking. We go one step
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* further back to find the name of the encapsulating function from
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* which log() was called.
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*/
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$file = @$backtrace[$depth]['file'];
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$line = @$backtrace[$depth]['line'];
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$func = @$backtrace[$depth + 1]['function'];
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/*
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* However, if log() was called from one of our "shortcut" functions,
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* we're going to need to go back an additional step.
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*/
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if (in_array($func, array('emerg', 'alert', 'crit', 'err', 'warning',
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'notice', 'info', 'debug'))) {
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$file = @$backtrace[$depth + 1]['file'];
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$line = @$backtrace[$depth + 1]['line'];
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$func = @$backtrace[$depth + 2]['function'];
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}
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/*
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* If we couldn't extract a function name (perhaps because we were
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* executed from the "main" context), provide a default value.
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*/
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if (is_null($func)) {
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$func = '(none)';
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}
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/* Return a 3-tuple containing (file, line, function). */
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return array($file, $line, $func);
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}
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/**
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* Produces a formatted log line based on a format string and a set of
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* variables representing the current log record and state.
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*
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* @return string Formatted log string.
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*
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* @access private
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* @since Log 1.9.4
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*/
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function _format($format, $timestamp, $priority, $message)
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{
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/*
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* If the format string references any of the backtrace-driven
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* variables (%5, %6, %7), generate the backtrace and fetch them.
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*/
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if (strpos($format, '%5') || strpos($format, '%6') || strpos($format, '%7')) {
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list($file, $line, $func) = $this->_getBacktraceVars(2);
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}
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/*
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* Build the formatted string. We use the sprintf() function's
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* "argument swapping" capability to dynamically select and position
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* the variables which will ultimately appear in the log string.
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*/
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return sprintf($format,
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$timestamp,
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$this->_ident,
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$this->priorityToString($priority),
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$message,
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isset($file) ? $file : '',
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isset($line) ? $line : '',
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isset($func) ? $func : '');
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}
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/**
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* Returns the string representation of a PEAR_LOG_* integer constant.
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*
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* @param int $priority A PEAR_LOG_* integer constant.
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*
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* @return string The string representation of $level.
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*
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* @since Log 1.0
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*/
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function priorityToString($priority)
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{
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$levels = array(
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PEAR_LOG_EMERG => 'emergency',
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PEAR_LOG_ALERT => 'alert',
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PEAR_LOG_CRIT => 'critical',
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PEAR_LOG_ERR => 'error',
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PEAR_LOG_WARNING => 'warning',
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PEAR_LOG_NOTICE => 'notice',
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PEAR_LOG_INFO => 'info',
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PEAR_LOG_DEBUG => 'debug'
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);
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return $levels[$priority];
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}
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/**
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* Returns the the PEAR_LOG_* integer constant for the given string
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* representation of a priority name. This function performs a
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* case-insensitive search.
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*
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* @param string $name String containing a priority name.
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*
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* @return string The PEAR_LOG_* integer contstant corresponding
|
|
* the the specified priority name.
|
|
*
|
|
* @since Log 1.9.0
|
|
*/
|
|
function stringToPriority($name)
|
|
{
|
|
$levels = array(
|
|
'emergency' => PEAR_LOG_EMERG,
|
|
'alert' => PEAR_LOG_ALERT,
|
|
'critical' => PEAR_LOG_CRIT,
|
|
'error' => PEAR_LOG_ERR,
|
|
'warning' => PEAR_LOG_WARNING,
|
|
'notice' => PEAR_LOG_NOTICE,
|
|
'info' => PEAR_LOG_INFO,
|
|
'debug' => PEAR_LOG_DEBUG
|
|
);
|
|
|
|
return $levels[strtolower($name)];
|
|
}
|
|
|
|
/**
|
|
* Calculate the log mask for the given priority.
|
|
*
|
|
* This method may be called statically.
|
|
*
|
|
* @param integer $priority The priority whose mask will be calculated.
|
|
*
|
|
* @return integer The calculated log mask.
|
|
*
|
|
* @access public
|
|
* @since Log 1.7.0
|
|
*/
|
|
function MASK($priority)
|
|
{
|
|
return (1 << $priority);
|
|
}
|
|
|
|
/**
|
|
* Calculate the log mask for all priorities up to the given priority.
|
|
*
|
|
* This method may be called statically.
|
|
*
|
|
* @param integer $priority The maximum priority covered by this mask.
|
|
*
|
|
* @return integer The resulting log mask.
|
|
*
|
|
* @access public
|
|
* @since Log 1.7.0
|
|
*
|
|
* @deprecated deprecated since Log 1.9.4; use Log::MAX() instead
|
|
*/
|
|
function UPTO($priority)
|
|
{
|
|
return Log::MAX($priority);
|
|
}
|
|
|
|
/**
|
|
* Calculate the log mask for all priorities greater than or equal to the
|
|
* given priority. In other words, $priority will be the lowest priority
|
|
* matched by the resulting mask.
|
|
*
|
|
* This method may be called statically.
|
|
*
|
|
* @param integer $priority The minimum priority covered by this mask.
|
|
*
|
|
* @return integer The resulting log mask.
|
|
*
|
|
* @access public
|
|
* @since Log 1.9.4
|
|
*/
|
|
function MIN($priority)
|
|
{
|
|
return PEAR_LOG_ALL ^ ((1 << $priority) - 1);
|
|
}
|
|
|
|
/**
|
|
* Calculate the log mask for all priorities less than or equal to the
|
|
* given priority. In other words, $priority will be the highests priority
|
|
* matched by the resulting mask.
|
|
*
|
|
* This method may be called statically.
|
|
*
|
|
* @param integer $priority The maximum priority covered by this mask.
|
|
*
|
|
* @return integer The resulting log mask.
|
|
*
|
|
* @access public
|
|
* @since Log 1.9.4
|
|
*/
|
|
function MAX($priority)
|
|
{
|
|
return ((1 << ($priority + 1)) - 1);
|
|
}
|
|
|
|
/**
|
|
* Set and return the level mask for the current Log instance.
|
|
*
|
|
* @param integer $mask A bitwise mask of log levels.
|
|
*
|
|
* @return integer The current level mask.
|
|
*
|
|
* @access public
|
|
* @since Log 1.7.0
|
|
*/
|
|
function setMask($mask)
|
|
{
|
|
$this->_mask = $mask;
|
|
|
|
return $this->_mask;
|
|
}
|
|
|
|
/**
|
|
* Returns the current level mask.
|
|
*
|
|
* @return interger The current level mask.
|
|
*
|
|
* @access public
|
|
* @since Log 1.7.0
|
|
*/
|
|
function getMask()
|
|
{
|
|
return $this->_mask;
|
|
}
|
|
|
|
/**
|
|
* Check if the given priority is included in the current level mask.
|
|
*
|
|
* @param integer $priority The priority to check.
|
|
*
|
|
* @return boolean True if the given priority is included in the current
|
|
* log mask.
|
|
*
|
|
* @access private
|
|
* @since Log 1.7.0
|
|
*/
|
|
function _isMasked($priority)
|
|
{
|
|
return (Log::MASK($priority) & $this->_mask);
|
|
}
|
|
|
|
/**
|
|
* Returns the current default priority.
|
|
*
|
|
* @return integer The current default priority.
|
|
*
|
|
* @access public
|
|
* @since Log 1.8.4
|
|
*/
|
|
function getPriority()
|
|
{
|
|
return $this->_priority;
|
|
}
|
|
|
|
/**
|
|
* Sets the default priority to the specified value.
|
|
*
|
|
* @param integer $priority The new default priority.
|
|
*
|
|
* @access public
|
|
* @since Log 1.8.4
|
|
*/
|
|
function setPriority($priority)
|
|
{
|
|
$this->_priority = $priority;
|
|
}
|
|
|
|
/**
|
|
* Adds a Log_observer instance to the list of observers that are listening
|
|
* for messages emitted by this Log instance.
|
|
*
|
|
* @param object $observer The Log_observer instance to attach as a
|
|
* listener.
|
|
*
|
|
* @param boolean True if the observer is successfully attached.
|
|
*
|
|
* @access public
|
|
* @since Log 1.0
|
|
*/
|
|
function attach(&$observer)
|
|
{
|
|
if (!is_a($observer, 'Log_observer')) {
|
|
return false;
|
|
}
|
|
|
|
$this->_listeners[$observer->_id] = &$observer;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Removes a Log_observer instance from the list of observers.
|
|
*
|
|
* @param object $observer The Log_observer instance to detach from
|
|
* the list of listeners.
|
|
*
|
|
* @param boolean True if the observer is successfully detached.
|
|
*
|
|
* @access public
|
|
* @since Log 1.0
|
|
*/
|
|
function detach($observer)
|
|
{
|
|
if (!is_a($observer, 'Log_observer') ||
|
|
!isset($this->_listeners[$observer->_id])) {
|
|
return false;
|
|
}
|
|
|
|
unset($this->_listeners[$observer->_id]);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Informs each registered observer instance that a new message has been
|
|
* logged.
|
|
*
|
|
* @param array $event A hash describing the log event.
|
|
*
|
|
* @access private
|
|
*/
|
|
function _announce($event)
|
|
{
|
|
foreach ($this->_listeners as $id => $listener) {
|
|
if ($event['priority'] <= $this->_listeners[$id]->_priority) {
|
|
$this->_listeners[$id]->notify($event);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Indicates whether this is a composite class.
|
|
*
|
|
* @return boolean True if this is a composite class.
|
|
*
|
|
* @access public
|
|
* @since Log 1.0
|
|
*/
|
|
function isComposite()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Sets this Log instance's identification string.
|
|
*
|
|
* @param string $ident The new identification string.
|
|
*
|
|
* @access public
|
|
* @since Log 1.6.3
|
|
*/
|
|
function setIdent($ident)
|
|
{
|
|
$this->_ident = $ident;
|
|
}
|
|
|
|
/**
|
|
* Returns the current identification string.
|
|
*
|
|
* @return string The current Log instance's identification string.
|
|
*
|
|
* @access public
|
|
* @since Log 1.6.3
|
|
*/
|
|
function getIdent()
|
|
{
|
|
return $this->_ident;
|
|
}
|
|
}
|