library/log4php/appenders/LoggerAppenderFile.php
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<?php
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/**
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements. See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License. You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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/**
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 * LoggerAppenderFile appends log events to a file.
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 *
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 * This appender uses a layout.
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 *
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 * ## Configurable parameters: ##
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 *
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 * - **file** - Path to the target file. Relative paths are resolved based on
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 *     the working directory.
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 * - **append** - If set to true, the appender will append to the file,
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 *     otherwise the file contents will be overwritten.
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 *
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 * @version $Revision: 1382274 $
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 * @package log4php
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 * @subpackage appenders
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 * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
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 * @link http://logging.apache.org/log4php/docs/appenders/file.html Appender documentation
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 */
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class LoggerAppenderFile extends LoggerAppender {
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    /**
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     * If set to true, the file is locked before appending. This allows
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     * concurrent access. However, appending without locking is faster so
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     * it should be used where appropriate.
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     *
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     * TODO: make this a configurable parameter
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     *
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     * @var boolean
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     */
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    protected $locking = true;
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    /**
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     * If set to true, appends to file. Otherwise overwrites it.
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     * @var boolean
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     */
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    protected $append = true;
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    /**
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     * Path to the target file.
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     * @var string
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     */
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    protected $file;
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    /**
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     * The file resource.
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     * @var resource
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     */
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    protected $fp;
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    /**
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     * Helper function which can be easily overriden by daily file appender.
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     */
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    protected function getTargetFile() {
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        return $this->file;
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    }
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    /**
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     * Acquires the target file resource, creates the destination folder if
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     * necessary. Writes layout header to file.
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     *
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     * @return boolean FALSE if opening failed
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     */
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    protected function openFile() {
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        $file = $this->getTargetFile();
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        // Create the target folder if needed
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        if (!is_file($file)) {
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            $dir = dirname($file);
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            if (!is_dir($dir)) {
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                $success = mkdir($dir, 0777, true);
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                if ($success === false) {
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                    $this->warn("Failed creating target directory [$dir]. Closing appender.");
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                    $this->closed = true;
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                    return false;
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                }
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            }
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        }
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        $mode = $this->append ? 'a' : 'w';
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        $this->fp = fopen($file, $mode);
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        if ($this->fp === false) {
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            $this->warn("Failed opening target file. Closing appender.");
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            $this->fp = null;
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            $this->closed = true;
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            return false;
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        }
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        // Required when appending with concurrent access
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        if ($this->append) {
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            fseek($this->fp, 0, SEEK_END);
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        }
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        // Write the header
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        $this->write($this->layout->getHeader());
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    }
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    /**
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     * Writes a string to the target file. Opens file if not already open.
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     * @param string $string Data to write.
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     */
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    protected function write($string) {
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        // Lazy file open
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        if (!isset($this->fp)) {
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            if ($this->openFile() === false) {
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                return; // Do not write if file open failed.
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            }
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        }
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        if ($this->locking) {
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            $this->writeWithLocking($string);
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        } else {
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            $this->writeWithoutLocking($string);
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        }
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    }
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    protected function writeWithLocking($string) {
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        if (flock($this->fp, LOCK_EX)) {
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            if (fwrite($this->fp, $string) === false) {
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                $this->warn("Failed writing to file. Closing appender.");
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                $this->closed = true;
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            }
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            flock($this->fp, LOCK_UN);
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        } else {
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            $this->warn("Failed locking file for writing. Closing appender.");
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            $this->closed = true;
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        }
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    }
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    protected function writeWithoutLocking($string) {
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        if (fwrite($this->fp, $string) === false) {
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            $this->warn("Failed writing to file. Closing appender.");
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            $this->closed = true;
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        }
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    }
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    public function activateOptions() {
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        if (empty($this->file)) {
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            $this->warn("Required parameter 'file' not set. Closing appender.");
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            $this->closed = true;
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            return;
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        }
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    }
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    public function close() {
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        if (is_resource($this->fp)) {
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            $this->write($this->layout->getFooter());
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            fclose($this->fp);
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        }
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        $this->fp = null;
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        $this->closed = true;
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    }
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    public function append(LoggerLoggingEvent $event) {
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        $this->write($this->layout->format($event));
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    }
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    /**
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     * Sets the 'file' parameter.
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     * @param string $file
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     */
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    public function setFile($file) {
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        $this->setString('file', $file);
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    }
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    /**
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     * Returns the 'file' parameter.
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     * @return string
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     */
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    public function getFile() {
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        return $this->file;
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    }
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    /**
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     * Returns the 'append' parameter.
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     * @return boolean
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     */
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    public function getAppend() {
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        return $this->append;
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    }
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    /**
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     * Sets the 'append' parameter.
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     * @param boolean $append
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     */
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    public function setAppend($append) {
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        $this->setBoolean('append', $append);
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    }
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    /**
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     * Sets the 'file' parmeter. Left for legacy reasons.
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     * @param string $fileName
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     * @deprecated Use setFile() instead.
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     */
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    public function setFileName($fileName) {
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        $this->setFile($fileName);
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    }
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    /**
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     * Returns the 'file' parmeter. Left for legacy reasons.
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     * @return string
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     * @deprecated Use getFile() instead.
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     */
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    public function getFileName() {
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        return $this->getFile();
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    }
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}