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<?php
/**
* $Header$
*
* @version $Revision$
* @package Log
*/
/**
* The Log_file class is a concrete implementation of the Log abstract
* class that logs messages to a text file.
*
* @author Jon Parise <jon@php.net>
* @author Roman Neuhauser <neuhauser@bellavista.cz>
* @since Log 1.0
* @package Log
*
* @example file.php Using the file handler.
*/
class Log_file extends Log
{
/**
* String containing the name of the log file.
* @var string
* @access private
*/
var $_filename = 'php.log';
/**
* Handle to the log file.
* @var resource
* @access private
*/
var $_fp = false;
/**
* Should new log entries be append to an existing log file, or should the
* a new log file overwrite an existing one?
* @var boolean
* @access private
*/
var $_append = true;
/**
* Should advisory file locking (i.e., flock()) be used?
* @var boolean
* @access private
*/
var $_locking = false;
/**
* Integer (in octal) containing the log file's permissions mode.
* @var integer
* @access private
*/
var $_mode = 0644;
/**
* Integer (in octal) specifying the file permission mode that will be
* used when creating directories that do not already exist.
* @var integer
* @access private
*/
var $_dirmode = 0755;
/**
* String containing the format of a log line.
* @var string
* @access private
*/
var $_lineFormat = '%1$s %2$s [%3$s] %4$s';
/**
* String containing the timestamp format. It will be passed directly to
* strftime(). Note that the timestamp string will generated using the
* current locale.
* @var string
* @access private
*/
var $_timeFormat = '%b %d %H:%M:%S';
/**
* String containing the end-on-line character sequence.
* @var string
* @access private
*/
var $_eol = "\n";
/**
* Constructs a new Log_file object.
*
* @param string $name Ignored.
* @param string $ident The identity string.
* @param array $conf The configuration array.
* @param int $level Log messages up to and including this level.
* @access public
*/
public function __construct($name, $ident = '', $conf = array(),
$level = PEAR_LOG_DEBUG)
{
$this->_id = md5(microtime().rand());
$this->_filename = $name;
$this->_ident = $ident;
$this->_mask = Log::UPTO($level);
if (isset($conf['append'])) {
$this->_append = $conf['append'];
}
if (isset($conf['locking'])) {
$this->_locking = $conf['locking'];
}
if (!empty($conf['mode'])) {
if (is_string($conf['mode'])) {
$this->_mode = octdec($conf['mode']);
} else {
$this->_mode = $conf['mode'];
}
}
if (!empty($conf['dirmode'])) {
if (is_string($conf['dirmode'])) {
$this->_dirmode = octdec($conf['dirmode']);
} else {
$this->_dirmode = $conf['dirmode'];
}
}
if (!empty($conf['lineFormat'])) {
$this->_lineFormat = str_replace(array_keys($this->_formatMap),
array_values($this->_formatMap),
$conf['lineFormat']);
}
if (!empty($conf['timeFormat'])) {
$this->_timeFormat = $conf['timeFormat'];
}
if (!empty($conf['eol'])) {
$this->_eol = $conf['eol'];
} else {
$this->_eol = (strstr(PHP_OS, 'WIN')) ? "\r\n" : "\n";
}
register_shutdown_function(array(&$this, '_Log_file'));
}
/**
* Destructor
*/
function _Log_file()
{
if ($this->_opened) {
$this->close();
}
}
/**
* Creates the given directory path. If the parent directories don't
* already exist, they will be created, too.
*
* This implementation is inspired by Python's os.makedirs function.
*
* @param string $path The full directory path to create.
* @param integer $mode The permissions mode with which the
* directories will be created.
*
* @return True if the full path is successfully created or already
* exists.
*
* @access private
*/
function _mkpath($path, $mode = 0700)
{
/* Separate the last pathname component from the rest of the path. */
$head = dirname($path);
$tail = basename($path);
/* Make sure we've split the path into two complete components. */
if (empty($tail)) {
$head = dirname($path);
$tail = basename($path);
}
/* Recurse up the path if our current segment does not exist. */
if (!empty($head) && !empty($tail) && !is_dir($head)) {
$this->_mkpath($head, $mode);
}
/* Create this segment of the path. */
return @mkdir($head, $mode);
}
/**
* Opens the log file for output. If the specified log file does not
* already exist, it will be created. By default, new log entries are
* appended to the end of the log file.
*
* This is implicitly called by log(), if necessary.
*
* @access public
*/
function open()
{
if (!$this->_opened) {
/* If the log file's directory doesn't exist, create it. */
if (!is_dir(dirname($this->_filename))) {
$this->_mkpath($this->_filename, $this->_dirmode);
}
/* Determine whether the log file needs to be created. */
$creating = !file_exists($this->_filename);
/* Obtain a handle to the log file. */
$this->_fp = fopen($this->_filename, ($this->_append) ? 'a' : 'w');
/* We consider the file "opened" if we have a valid file pointer. */
$this->_opened = ($this->_fp !== false);
/* Attempt to set the file's permissions if we just created it. */
if ($creating && $this->_opened) {
chmod($this->_filename, $this->_mode);
}
}
return $this->_opened;
}
/**
* Closes the log file if it is open.
*
* @access public
*/
function close()
{
/* If the log file is open, close it. */
if ($this->_opened && fclose($this->_fp)) {
$this->_opened = false;
}
return ($this->_opened === false);
}
/**
* Flushes all pending data to the file handle.
*
* @access public
* @since Log 1.8.2
*/
function flush()
{
if (is_resource($this->_fp)) {
return fflush($this->_fp);
}
return false;
}
/**
* Logs $message to the output window. The message is also passed along
* to any Log_observer instances that are observing this Log.
*
* @param mixed $message String or object containing the message to log.
* @param string $priority The priority of the message. Valid
* values are: PEAR_LOG_EMERG, PEAR_LOG_ALERT,
* PEAR_LOG_CRIT, PEAR_LOG_ERR, PEAR_LOG_WARNING,
* PEAR_LOG_NOTICE, PEAR_LOG_INFO, and PEAR_LOG_DEBUG.
* @return boolean True on success or false on failure.
* @access public
*/
function log($message, $priority = null)
{
/* If a priority hasn't been specified, use the default value. */
if ($priority === null) {
$priority = $this->_priority;
}
/* Abort early if the priority is above the maximum logging level. */
if (!$this->_isMasked($priority)) {
return false;
}
/* If the log file isn't already open, open it now. */
if (!$this->_opened && !$this->open()) {
return false;
}
/* Extract the string representation of the message. */
$message = $this->_extractMessage($message);
/* Build the string containing the complete log line. */
$line = $this->_format($this->_lineFormat,
strftime($this->_timeFormat),
$priority, $message) . $this->_eol;
/* If locking is enabled, acquire an exclusive lock on the file. */
if ($this->_locking) {
flock($this->_fp, LOCK_EX);
}
/* Write the log line to the log file. */
$success = (fwrite($this->_fp, $line) !== false);
/* Unlock the file now that we're finished writing to it. */
if ($this->_locking) {
flock($this->_fp, LOCK_UN);
}
/* Notify observers about this log message. */
$this->_announce(array('priority' => $priority, 'message' => $message));
return $success;
}
}
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