maxFileSize. * * There is one backup file by default. * * @var integer */ protected $maxBackupIndex = 1; /** * The compress parameter determindes the compression with zlib. * If set to true, the rollover files are compressed and saved with the .gz extension. * @var boolean */ protected $compress = false; /** * Set to true in the constructor if PHP >= 5.3.0. In that case clearstatcache * supports conditional clearing of statistics. * @var boolean * @see http://php.net/manual/en/function.clearstatcache.php */ private $clearConditional = false; /** * Get the maximum size that the output file is allowed to reach * before being rolled over to backup files. * @return integer */ public function getMaximumFileSize() { return $this->maxFileSize; } public function __construct($name = '') { parent::__construct($name); if (version_compare(PHP_VERSION, '5.3.0') >= 0) { $this->clearConditional = true; } } /** * Implements the usual roll over behaviour. * * If MaxBackupIndex is positive, then files File.1, ..., File.MaxBackupIndex -1 are renamed to File.2, ..., File.MaxBackupIndex. * Moreover, File is renamed File.1 and closed. A new File is created to receive further log output. * * If MaxBackupIndex is equal to zero, then the File is truncated with no backup files created. * * Rollover must be called while the file is locked so that it is safe for concurrent access. * * @throws LoggerException If any part of the rollover procedure fails. */ private function rollOver() { // If maxBackups <= 0, then there is no file renaming to be done. if($this->maxBackupIndex > 0) { // Delete the oldest file, to keep Windows happy. $file = $this->file . '.' . $this->maxBackupIndex; if (file_exists($file) && !unlink($file)) { throw new LoggerException("Unable to delete oldest backup file from [$file]."); } // Map {(maxBackupIndex - 1), ..., 2, 1} to {maxBackupIndex, ..., 3, 2} $this->renameArchievedLogs($this->file); // Backup the active file $this->moveToBackup($this->file); } // Truncate the active file ftruncate($this->fp, 0); rewind($this->fp); } private function moveToBackup($source) { if ($this->compress) { $target = $source . '.1.gz'; $this->compressFile($source, $target); } else { $target = $source . '.1'; copy($source, $target); } } private function compressFile($source, $target) { $target = 'compress.zlib://' . $target; $fin = fopen($source, 'rb'); if ($fin === false) { throw new LoggerException("Unable to open file for reading: [$source]."); } $fout = fopen($target, 'wb'); if ($fout === false) { throw new LoggerException("Unable to open file for writing: [$target]."); } while (!feof($fin)) { $chunk = fread($fin, self::COMPRESS_CHUNK_SIZE); if (false === fwrite($fout, $chunk)) { throw new LoggerException("Failed writing to compressed file."); } } fclose($fin); fclose($fout); } private function renameArchievedLogs($fileName) { for($i = $this->maxBackupIndex - 1; $i >= 1; $i--) { $source = $fileName . "." . $i; if ($this->compress) { $source .= '.gz'; } if(file_exists($source)) { $target = $fileName . '.' . ($i + 1); if ($this->compress) { $target .= '.gz'; } rename($source, $target); } } } /** * Writes a string to the target file. Opens file if not already open. * @param string $string Data to write. */ protected function write($string) { // Lazy file open if(!isset($this->fp)) { if ($this->openFile() === false) { return; // Do not write if file open failed. } } // Lock the file while writing and possible rolling over if(flock($this->fp, LOCK_EX)) { // Write to locked file if(fwrite($this->fp, $string) === false) { $this->warn("Failed writing to file. Closing appender."); $this->closed = true; } // Stats cache must be cleared, otherwise filesize() returns cached results // If supported (PHP 5.3+), clear only the state cache for the target file if ($this->clearConditional) { clearstatcache(true, $this->file); } else { clearstatcache(); } // Rollover if needed if (filesize($this->file) > $this->maxFileSize) { try { $this->rollOver(); } catch (LoggerException $ex) { $this->warn("Rollover failed: " . $ex->getMessage() . " Closing appender."); $this->closed = true; } } flock($this->fp, LOCK_UN); } else { $this->warn("Failed locking file for writing. Closing appender."); $this->closed = true; } } public function activateOptions() { parent::activateOptions(); if ($this->compress && !extension_loaded('zlib')) { $this->warn("The 'zlib' extension is required for file compression. Disabling compression."); $this->compression = false; } } /** * Set the 'maxBackupIndex' parameter. * @param integer $maxBackupIndex */ public function setMaxBackupIndex($maxBackupIndex) { $this->setPositiveInteger('maxBackupIndex', $maxBackupIndex); } /** * Returns the 'maxBackupIndex' parameter. * @return integer */ public function getMaxBackupIndex() { return $this->maxBackupIndex; } /** * Set the 'maxFileSize' parameter. * @param mixed $maxFileSize */ public function setMaxFileSize($maxFileSize) { $this->setFileSize('maxFileSize', $maxFileSize); } /** * Returns the 'maxFileSize' parameter. * @return integer */ public function getMaxFileSize() { return $this->maxFileSize; } /** * Set the 'maxFileSize' parameter (kept for backward compatibility). * @param mixed $maxFileSize * @deprecated Use setMaxFileSize() instead. */ public function setMaximumFileSize($maxFileSize) { $this->warn("The 'maximumFileSize' parameter is deprecated. Use 'maxFileSize' instead."); return $this->setMaxFileSize($maxFileSize); } /** * Sets the 'compress' parameter. * @param boolean $compress */ public function setCompress($compress) { $this->setBoolean('compress', $compress); } /** * Returns the 'compress' parameter. * @param boolean */ public function getCompress() { return $this->compress; } }