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+<?php
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @package log4php
+ */
+
+/**
+ * LoggerAppenderRollingFile writes logging events to a specified file. The
+ * file is rolled over after a specified size has been reached.
+ *
+ * This appender uses a layout.
+ *
+ * ## Configurable parameters: ##
+ *
+ * - **file** - Path to the target file.
+ * - **append** - If set to true, the appender will append to the file,
+ * otherwise the file contents will be overwritten.
+ * - **maxBackupIndex** - Maximum number of backup files to keep. Default is 1.
+ * - **maxFileSize** - Maximum allowed file size (in bytes) before rolling
+ * over. Suffixes "KB", "MB" and "GB" are allowed. 10KB = 10240 bytes, etc.
+ * Default is 10M.
+ * - **compress** - If set to true, rolled-over files will be compressed.
+ * Requires the zlib extension.
+ *
+ * @version $Revision: 1394975 $
+ * @package log4php
+ * @subpackage appenders
+ * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
+ * @link http://logging.apache.org/log4php/docs/appenders/rolling-file.html Appender documentation
+ */
+class LoggerAppenderRollingFile extends LoggerAppenderFile {
+
+ /** Compressing backup files is done in chunks, this determines how large. */
+ const COMPRESS_CHUNK_SIZE = 102400; // 100KB
+
+ /**
+ * The maximum size (in bytes) that the output file is allowed to reach
+ * before being rolled over to backup files.
+ *
+ * The default maximum file size is 10MB (10485760 bytes). Maximum value
+ * for this option may depend on the file system.
+ *
+ * @var integer
+ */
+ protected $maxFileSize = 10485760;
+
+ /**
+ * Set the maximum number of backup files to keep around.
+ *
+ * Determines how many backup files are kept before the oldest is erased.
+ * This option takes a positive integer value. If set to zero, then there
+ * will be no backup files and the log file will be truncated when it
+ * reaches <var>maxFileSize</var>.
+ *
+ * There is one backup file by default.
+ *
+ * @var integer
+ */
+ protected $maxBackupIndex = 1;
+
+ /**
+ * The <var>compress</var> 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;
+ }
+}