/trunk/lib/include/Log.php
PHP | 847 lines | 276 code | 65 blank | 506 comment | 28 complexity | f364137c56055059da8705bc2ad31e88 MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, LGPL-2.1
- <?php
- /**
- * $Header: /repository/pear/Log/Log.php,v 1.67 2007/12/13 06:46:30 jon Exp $
- * $Horde: horde/lib/Log.php,v 1.15 2000/06/29 23:39:45 jon Exp $
- *
- * @version $Revision: 1.67 $
- * @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 protected
- */
- var $_opened = false;
- /**
- * Instance-specific unique identification number.
- *
- * @var integer
- * @access protected
- */
- var $_id = 0;
- /**
- * The label that uniquely identifies this set of log messages.
- *
- * @var string
- * @access protected
- */
- var $_ident = '';
- /**
- * The default priority to use when logging an event.
- *
- * @var integer
- * @access protected
- */
- var $_priority = PEAR_LOG_INFO;
- /**
- * The bitmask of allowed log levels.
- *
- * @var integer
- * @access protected
- */
- var $_mask = PEAR_LOG_ALL;
- /**
- * Holds all Log_observer objects that wish to be notified of new messages.
- *
- * @var array
- * @access protected
- */
- var $_listeners = array();
- /**
- * Maps canonical format keys to position arguments for use in building
- * "line format" strings.
- *
- * @var array
- * @access protected
- */
- var $_formatMap = array('%{timestamp}' => '%1$s',
- '%{ident}' => '%2$s',
- '%{priority}' => '%3$s',
- '%{message}' => '%4$s',
- '%{file}' => '%5$s',
- '%{line}' => '%6$s',
- '%{function}' => '%7$s',
- '%\{' => '%%{');
- /**
- * Utility function which wraps PHP's class_exists() function to ensure
- * consistent behavior between PHP versions 4 and 5. Autoloading behavior
- * is always disabled.
- *
- * @param string $class The name of the class whose existence should
- * be tested.
- *
- * @return bool True if the class exists.
- *
- * @access private
- * @since Log 1.9.13
- */
- function _classExists($class)
- {
- if (version_compare(PHP_VERSION, '5.0.0', 'ge')) {
- return class_exists($class, false);
- }
- return class_exists($class);
- }
- /**
- * 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 $level Log messages up to and including this level.
- *
- * @return object Log The newly created concrete Log instance, or
- * null on an error.
- * @access public
- * @since Log 1.0
- */
- function &factory($handler, $name = '', $ident = '', $conf = array(),
- $level = PEAR_LOG_DEBUG)
- {
- $handler = strtolower($handler);
- $class = 'Log_' . $handler;
- $classfile = 'Log/' . $handler . '.php';
- /*
- * Attempt to include our version of the named class, but don't treat
- * a failure as fatal. The caller may have already included their own
- * version of the named class.
- */
- if (!Log::_classExists($class)) {
- include_once $classfile;
- }
- /* If the class exists, return a new instance of it. */
- if (Log::_classExists($class)) {
- $obj = &new $class($name, $ident, $conf, $level);
- return $obj;
- }
- $null = null;
- return $null;
- }
- /**
- * 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 $level Log messages up to and including this level.
- *
- * @return object Log The newly created concrete Log instance, or
- * null on an error.
- * @access public
- * @since Log 1.0
- */
- function &singleton($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 $message The original message data. This may be a
- * string or any object.
- *
- * @return string The string representation of the message.
- *
- * @access protected
- */
- function _extractMessage($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')) {
- if (version_compare(PHP_VERSION, '5.0.0', 'ge')) {
- $message = (string)$message;
- } else {
- $message = $message->__toString();
- }
- } else {
- $message = print_r($message, true);
- }
- } else if (is_array($message)) {
- if (isset($message['message'])) {
- $message = $message['message'];
- } else {
- $message = print_r($message, true);
- }
- }
- /* Otherwise, we assume the message is a string. */
- return $message;
- }
- /**
- * Using debug_backtrace(), returns the file, line, and enclosing function
- * name of the source code context from which log() was invoked.
- *
- * @param int $depth The initial number of frames we should step
- * back into the trace.
- *
- * @return array Array containing three strings: the filename, the line,
- * and the function name from which log() was called.
- *
- * @access private
- * @since Log 1.9.4
- */
- function _getBacktraceVars($depth)
- {
- /* Start by generating a backtrace from the current call (here). */
- $backtrace = debug_backtrace();
- /*
- * If we were ultimately invoked by the composite handler, we need to
- * increase our depth one additional level to compensate.
- */
- if (strcasecmp(@$backtrace[$depth+1]['class'], 'Log_composite') == 0) {
- $depth++;
- }
- /*
- * We're interested in the frame which invoked the log() function, so
- * we need to walk back some number of frames into the backtrace. The
- * $depth parameter tells us where to start looking. We go one step
- * further back to find the name of the encapsulating function from
- * which log() was called.
- */
- $file = @$backtrace[$depth]['file'];
- $line = @$backtrace[$depth]['line'];
- $func = @$backtrace[$depth + 1]['function'];
- /*
- * However, if log() was called from one of our "shortcut" functions,
- * we're going to need to go back an additional step.
- */
- if (in_array($func, array('emerg', 'alert', 'crit', 'err', 'warning',
- 'notice', 'info', 'debug'))) {
- $file = @$backtrace[$depth + 1]['file'];
- $line = @$backtrace[$depth + 1]['line'];
- $func = @$backtrace[$depth + 2]['function'];
- }
- /*
- * If we couldn't extract a function name (perhaps because we were
- * executed from the "main" context), provide a default value.
- */
- if (is_null($func)) {
- $func = '(none)';
- }
- /* Return a 3-tuple containing (file, line, function). */
- return array($file, $line, $func);
- }
- /**
- * Produces a formatted log line based on a format string and a set of
- * variables representing the current log record and state.
- *
- * @return string Formatted log string.
- *
- * @access protected
- * @since Log 1.9.4
- */
- function _format($format, $timestamp, $priority, $message)
- {
- /*
- * If the format string references any of the backtrace-driven
- * variables (%5, %6, %7), generate the backtrace and fetch them.
- */
- if (strpos($format, '%5') || strpos($format, '%6') || strpos($format, '%7')) {
- list($file, $line, $func) = $this->_getBacktraceVars(2);
- }
- /*
- * Build the formatted string. We use the sprintf() function's
- * "argument swapping" capability to dynamically select and position
- * the variables which will ultimately appear in the log string.
- */
- return sprintf($format,
- $timestamp,
- $this->_ident,
- $this->priorityToString($priority),
- $message,
- isset($file) ? $file : '',
- isset($line) ? $line : '',
- isset($func) ? $func : '');
- }
- /**
- * Returns the string representation of a PEAR_LOG_* integer constant.
- *
- * @param int $priority A PEAR_LOG_* integer constant.
- *
- * @return string The string representation of $level.
- *
- * @access public
- * @since Log 1.0
- */
- function priorityToString($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];
- }
- /**
- * Returns the the PEAR_LOG_* integer constant for the given string
- * representation of a priority name. This function performs a
- * case-insensitive search.
- *
- * @param string $name String containing a priority name.
- *
- * @return string The PEAR_LOG_* integer contstant corresponding
- * the the specified priority name.
- *
- * @access public
- * @since Log 1.9.0
- */
- function stringToPriority($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 $priority The priority to check.
- *
- * @return boolean True if the given priority is included in the current
- * log mask.
- *
- * @access protected
- * @since Log 1.7.0
- */
- function _isMasked($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 $event A hash describing the log event.
- *
- * @access protected
- */
- function _announce($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;
- }
- }