Файл: include/pear/Log.php
Строк: 691
<?php
/**
* $Header: /home/eugene/cvs/darktime.ru/include/pear/Log.php,v 1.1.1.1 2005/09/13 05:58:17 eugene Exp $
* $Horde: horde/lib/Log.php,v 1.15 2000/06/29 23:39:45 jon Exp $
*
* @version $Revision: 1.1.1.1 $
* @package Log
*/
define('PEAR_LOG_EMERG', 0); /** System is unusable */
define('PEAR_LOG_ALERT', 1); /** Immediate action required */
define('PEAR_LOG_CRIT', 2); /** Critical conditions */
define('PEAR_LOG_ERR', 3); /** Error conditions */
define('PEAR_LOG_WARNING', 4); /** Warning conditions */
define('PEAR_LOG_NOTICE', 5); /** Normal but significant */
define('PEAR_LOG_INFO', 6); /** Informational */
define('PEAR_LOG_DEBUG', 7); /** Debug-level messages */
define('PEAR_LOG_ALL', bindec('11111111')); /** All messages */
define('PEAR_LOG_NONE', bindec('00000000')); /** No message */
/* Log types for PHP's native error_log() function. */
define('PEAR_LOG_TYPE_SYSTEM', 0); /** Use PHP's system logger */
define('PEAR_LOG_TYPE_MAIL', 1); /** Use PHP's mail() function */
define('PEAR_LOG_TYPE_DEBUG', 2); /** Use PHP's debugging connection */
define('PEAR_LOG_TYPE_FILE', 3); /** Append to a file */
/**
* The Log:: class implements both an abstraction for various logging
* mechanisms and the Subject end of a Subject-Observer pattern.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @author Jon Parise <jon@php.net>
* @since Horde 1.3
* @package Log
*/
class Log
{
/**
* Indicates whether or not the log can been opened / connected.
*
* @var boolean
* @access private
*/
var $_opened = false;
/**
* Instance-specific unique identification number.
*
* @var integer
* @access private
*/
var $_id = 0;
/**
* The label that uniquely identifies this set of log messages.
*
* @var string
* @access private
*/
var $_ident = '';
/**
* The default priority to use when logging an event.
*
* @var integer
* @access private
*/
var $_priority = PEAR_LOG_INFO;
/**
* The bitmask of allowed log levels.
* @var integer
* @access private
*/
var $_mask = PEAR_LOG_ALL;
/**
* Holds all Log_observer objects that wish to be notified of new messages.
*
* @var array
* @access private
*/
var $_listeners = array();
/**
* Attempts to return a concrete Log instance of type $handler.
*
* @param string $handler The type of concrete Log subclass to return.
* Attempt to dynamically include the code for
* this subclass. Currently, valid values are
* 'console', 'syslog', 'sql', 'file', and 'mcal'.
*
* @param string $name The name of the actually log file, table, or
* other specific store to use. Defaults to an
* empty string, with which the subclass will
* attempt to do something intelligent.
*
* @param string $ident The identity reported to the log system.
*
* @param array $conf A hash containing any additional configuration
* information that a subclass might need.
*
* @param int $level Log messages up to and including this level.
*
* @return object Log The newly created concrete Log instance, or an
* false on an error.
* @access public
* @since Log 1.0
*/
function &factory($handler, $name = '', $ident = '', $conf = array(),
$level = PEAR_LOG_DEBUG)
{
$handler = strtolower($handler);
$class = 'Log_' . $handler;
$classfile = 'Log/' . $handler . '.php';
/*
* Attempt to include our version of the named class, but don't treat
* a failure as fatal. The caller may have already included their own
* version of the named class.
*/
@include_once $classfile;
/* If the class exists, return a new instance of it. */
if (class_exists($class)) {
return new $class($name, $ident, $conf, $level);
}
return false;
}
/**
* Attempts to return a reference to a concrete Log instance of type
* $handler, only creating a new instance if no log instance with the same
* parameters currently exists.
*
* You should use this if there are multiple places you might create a
* logger, you don't want to create multiple loggers, and you don't want to
* check for the existance of one each time. The singleton pattern does all
* the checking work for you.
*
* <b>You MUST call this method with the $var = &Log::singleton() syntax.
* Without the ampersand (&) in front of the method name, you will not get
* a reference, you will get a copy.</b>
*
* @param string $handler The type of concrete Log subclass to return.
* Attempt to dynamically include the code for
* this subclass. Currently, valid values are
* 'console', 'syslog', 'sql', 'file', and 'mcal'.
*
* @param string $name The name of the actually log file, table, or
* other specific store to use. Defaults to an
* empty string, with which the subclass will
* attempt to do something intelligent.
*
* @param string $ident The identity reported to the log system.
*
* @param array $conf A hash containing any additional configuration
* information that a subclass might need.
*
* @param int $level Log messages up to and including this level.
*
* @return object Log The newly created concrete Log instance, or an
* false on an error.
* @access public
* @since Log 1.0
*/
function &singleton($handler, $name = '', $ident = '', $conf = array(),
$level = PEAR_LOG_DEBUG)
{
static $instances;
if (!isset($instances)) $instances = array();
$signature = serialize(array($handler, $name, $ident, $conf, $level));
if (!isset($instances[$signature])) {
$instances[$signature] = &Log::factory($handler, $name, $ident,
$conf, $level);
}
return $instances[$signature];
}
/**
* Abstract implementation of the open() method.
* @since Log 1.0
*/
function open()
{
return false;
}
/**
* Abstract implementation of the close() method.
* @since Log 1.0
*/
function close()
{
return false;
}
/**
* Abstract implementation of the flush() method.
* @since Log 1.8.2
*/
function flush()
{
return false;
}
/**
* Abstract implementation of the log() method.
* @since Log 1.0
*/
function log($message, $priority = null)
{
return false;
}
/**
* A convenience function for logging a emergency event. It will log a
* message at the PEAR_LOG_EMERG log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function emerg($message)
{
return $this->log($message, PEAR_LOG_EMERG);
}
/**
* A convenience function for logging an alert event. It will log a
* message at the PEAR_LOG_ALERT log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function alert($message)
{
return $this->log($message, PEAR_LOG_ALERT);
}
/**
* A convenience function for logging a critical event. It will log a
* message at the PEAR_LOG_CRIT log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function crit($message)
{
return $this->log($message, PEAR_LOG_CRIT);
}
/**
* A convenience function for logging a error event. It will log a
* message at the PEAR_LOG_ERR log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function err($message)
{
return $this->log($message, PEAR_LOG_ERR);
}
/**
* A convenience function for logging a warning event. It will log a
* message at the PEAR_LOG_WARNING log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function warning($message)
{
return $this->log($message, PEAR_LOG_WARNING);
}
/**
* A convenience function for logging a notice event. It will log a
* message at the PEAR_LOG_NOTICE log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function notice($message)
{
return $this->log($message, PEAR_LOG_NOTICE);
}
/**
* A convenience function for logging a information event. It will log a
* message at the PEAR_LOG_INFO log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function info($message)
{
return $this->log($message, PEAR_LOG_INFO);
}
/**
* A convenience function for logging a debug event. It will log a
* message at the PEAR_LOG_DEBUG log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @access public
* @since Log 1.7.0
*/
function debug($message)
{
return $this->log($message, PEAR_LOG_DEBUG);
}
/**
* Returns the string representation of the message data.
*
* If $message is an object, _extractMessage() will attempt to extract
* the message text using a known method (such as a PEAR_Error object's
* getMessage() method). If a known method, cannot be found, the
* serialized representation of the object will be returned.
*
* If the message data is already a string, it will be returned unchanged.
*
* @param mixed $message The original message data. This may be a
* string or any object.
*
* @return string The string representation of the message.
*
* @access private
*/
function _extractMessage($message)
{
/*
* If we've been given an object, attempt to extract the message using
* a known method. If we can't find such a method, default to the
* "human-readable" version of the object.
*
* We also use the human-readable format for arrays.
*/
if (is_object($message)) {
if (method_exists($message, 'getmessage')) {
$message = $message->getMessage();
} else if (method_exists($message, 'tostring')) {
$message = $message->toString();
} else if (method_exists($message, '__tostring')) {
$message = (string)$message;
} else {
$message = print_r($message, true);
}
} else if (is_array($message)) {
$message = print_r($message, true);
}
/* Otherwise, we assume the message is a string. */
return $message;
}
/**
* Returns the string representation of a PEAR_LOG_* integer constant.
*
* @param int $priority A PEAR_LOG_* integer constant.
*
* @return string The string representation of $level.
*
* @since Log 1.0
*/
function priorityToString($priority)
{
$levels = array(
PEAR_LOG_EMERG => 'emergency',
PEAR_LOG_ALERT => 'alert',
PEAR_LOG_CRIT => 'critical',
PEAR_LOG_ERR => 'error',
PEAR_LOG_WARNING => 'warning',
PEAR_LOG_NOTICE => 'notice',
PEAR_LOG_INFO => 'info',
PEAR_LOG_DEBUG => 'debug'
);
return $levels[$priority];
}
/**
* Calculate the log mask for the given priority.
*
* @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.
*
* @param integer $priority The maximum priority covered by this mask.
*
* @return integer The calculated log mask.
*
* @access public
* @since Log 1.7.0
*/
function UPTO($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;
}
}
?>