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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
*/
/**
* Default implementation of the logger configurator.
*
* Configures log4php based on a provided configuration file or array.
*
* @package log4php
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
* @version $Revision: 1394956 $
* @since 2.2
*/
class LoggerConfiguratorDefault implements LoggerConfigurator
{
/** XML configuration file format. */
const FORMAT_XML = 'xml';
/** PHP configuration file format. */
const FORMAT_PHP = 'php';
/** INI (properties) configuration file format. */
const FORMAT_INI = 'ini';
/** Defines which adapter should be used for parsing which format. */
private $adapters = array(
self::FORMAT_XML => 'LoggerConfigurationAdapterXML',
self::FORMAT_INI => 'LoggerConfigurationAdapterINI',
self::FORMAT_PHP => 'LoggerConfigurationAdapterPHP',
);
/** Default configuration; used if no configuration file is provided. */
private static $defaultConfiguration = array(
'threshold' => 'ALL',
'rootLogger' => array(
'level' => 'DEBUG',
'appenders' => array('default'),
),
'appenders' => array(
'default' => array(
'class' => 'LoggerAppenderEcho'
),
),
);
/** Holds the appenders before they are linked to loggers. */
private $appenders = array();
/**
* Configures log4php based on the given configuration. The input can
* either be a path to the config file, or a PHP array holding the
* configuration.
*
* If no configuration is given, or if the given configuration cannot be
* parsed for whatever reason, a warning will be issued, and log4php
* will use the default configuration contained in
* {@link $defaultConfiguration}.
*
* @param LoggerHierarchy $hierarchy The hierarchy on which to perform
* the configuration.
* @param string|array $input Either path to the config file or the
* configuration as an array. If not set, default configuration
* will be used.
*/
public function configure(LoggerHierarchy $hierarchy, $input = null) {
$config = $this->parse($input);
$this->doConfigure($hierarchy, $config);
}
/**
* Parses the given configuration and returns the parsed configuration
* as a PHP array. Does not perform any configuration.
*
* If no configuration is given, or if the given configuration cannot be
* parsed for whatever reason, a warning will be issued, and the default
* configuration will be returned ({@link $defaultConfiguration}).
*
* @param string|array $input Either path to the config file or the
* configuration as an array. If not set, default configuration
* will be used.
* @return array The parsed configuration.
*/
public function parse($input) {
// No input - use default configuration
if (!isset($input)) {
$config = self::$defaultConfiguration;
}
// Array input - contains configuration within the array
else if (is_array($input)) {
$config = $input;
}
// String input - contains path to configuration file
else if (is_string($input)) {
try {
$config = $this->parseFile($input);
} catch (LoggerException $e) {
$this->warn("Configuration failed. " . $e->getMessage() . " Using default configuration.");
$config = self::$defaultConfiguration;
}
}
// Anything else is an error
else {
$this->warn("Invalid configuration param given. Reverting to default configuration.");
$config = self::$defaultConfiguration;
}
return $config;
}
/**
* Returns the default log4php configuration.
* @return array
*/
public static function getDefaultConfiguration() {
return self::$defaultConfiguration;
}
/**
* Loads the configuration file from the given URL, determines which
* adapter to use, converts the configuration to a PHP array and
* returns it.
*
* @param string $url Path to the config file.
* @return The configuration from the config file, as a PHP array.
* @throws LoggerException If the configuration file cannot be loaded, or
* if the parsing fails.
*/
private function parseFile($url) {
if (!file_exists($url)) {
throw new LoggerException("File not found at [$url].");
}
$type = $this->getConfigType($url);
$adapterClass = $this->adapters[$type];
$adapter = new $adapterClass();
return $adapter->convert($url);
}
/** Determines configuration file type based on the file extension. */
private function getConfigType($url) {
$info = pathinfo($url);
$ext = strtolower($info['extension']);
switch($ext) {
case 'xml':
return self::FORMAT_XML;
case 'ini':
case 'properties':
return self::FORMAT_INI;
case 'php':
return self::FORMAT_PHP;
default:
throw new LoggerException("Unsupported configuration file extension: $ext");
}
}
/**
* Constructs the logger hierarchy based on configuration.
*
* @param LoggerHierarchy $hierarchy
* @param array $config
*/
private function doConfigure(LoggerHierarchy $hierarchy, $config) {
if (isset($config['threshold'])) {
$threshold = LoggerLevel::toLevel($config['threshold']);
if (isset($threshold)) {
$hierarchy->setThreshold($threshold);
} else {
$this->warn("Invalid threshold value [{$config['threshold']}] specified. Ignoring threshold definition.");
}
}
// Configure appenders and add them to the appender pool
if (isset($config['appenders']) && is_array($config['appenders'])) {
foreach($config['appenders'] as $name => $appenderConfig) {
$this->configureAppender($name, $appenderConfig);
}
}
// Configure root logger
if (isset($config['rootLogger'])) {
$this->configureRootLogger($hierarchy, $config['rootLogger']);
}
// Configure loggers
if (isset($config['loggers']) && is_array($config['loggers'])) {
foreach($config['loggers'] as $loggerName => $loggerConfig) {
$this->configureOtherLogger($hierarchy, $loggerName, $loggerConfig);
}
}
// Configure renderers
if (isset($config['renderers']) && is_array($config['renderers'])) {
foreach($config['renderers'] as $rendererConfig) {
$this->configureRenderer($hierarchy, $rendererConfig);
}
}
if (isset($config['defaultRenderer'])) {
$this->configureDefaultRenderer($hierarchy, $config['defaultRenderer']);
}
}
private function configureRenderer(LoggerHierarchy $hierarchy, $config) {
if (empty($config['renderingClass'])) {
$this->warn("Rendering class not specified. Skipping renderer definition.");
return;
}
if (empty($config['renderedClass'])) {
$this->warn("Rendered class not specified. Skipping renderer definition.");
return;
}
// Error handling performed by RendererMap
$hierarchy->getRendererMap()->addRenderer($config['renderedClass'], $config['renderingClass']);
}
private function configureDefaultRenderer(LoggerHierarchy $hierarchy, $class) {
if (empty($class)) {
$this->warn("Rendering class not specified. Skipping default renderer definition.");
return;
}
// Error handling performed by RendererMap
$hierarchy->getRendererMap()->setDefaultRenderer($class);
}
/**
* Configures an appender based on given config and saves it to
* {@link $appenders} array so it can be later linked to loggers.
* @param string $name Appender name.
* @param array $config Appender configuration options.
*/
private function configureAppender($name, $config) {
// TODO: add this check to other places where it might be useful
if (!is_array($config)) {
$type = gettype($config);
$this->warn("Invalid configuration provided for appender [$name]. Expected an array, found <$type>. Skipping appender definition.");
return;
}
// Parse appender class
$class = $config['class'];
if (empty($class)) {
$this->warn("No class given for appender [$name]. Skipping appender definition.");
return;
}
if (!class_exists($class)) {
$this->warn("Invalid class [$class] given for appender [$name]. Class does not exist. Skipping appender definition.");
return;
}
// Instantiate the appender
$appender = new $class($name);
if (!($appender instanceof LoggerAppender)) {
$this->warn("Invalid class [$class] given for appender [$name]. Not a valid LoggerAppender class. Skipping appender definition.");
return;
}
// Parse the appender threshold
if (isset($config['threshold'])) {
$threshold = LoggerLevel::toLevel($config['threshold']);
if ($threshold instanceof LoggerLevel) {
$appender->setThreshold($threshold);
} else {
$this->warn("Invalid threshold value [{$config['threshold']}] specified for appender [$name]. Ignoring threshold definition.");
}
}
// Parse the appender layout
if ($appender->requiresLayout() && isset($config['layout'])) {
$this->createAppenderLayout($appender, $config['layout']);
}
// Parse filters
if (isset($config['filters']) && is_array($config['filters'])) {
foreach($config['filters'] as $filterConfig) {
$this->createAppenderFilter($appender, $filterConfig);
}
}
// Set options if any
if (isset($config['params'])) {
$this->setOptions($appender, $config['params']);
}
// Activate and save for later linking to loggers
$appender->activateOptions();
$this->appenders[$name] = $appender;
}
/**
* Parses layout config, creates the layout and links it to the appender.
* @param LoggerAppender $appender
* @param array $config Layout configuration.
*/
private function createAppenderLayout(LoggerAppender $appender, $config) {
$name = $appender->getName();
$class = $config['class'];
if (empty($class)) {
$this->warn("Layout class not specified for appender [$name]. Reverting to default layout.");
return;
}
if (!class_exists($class)) {
$this->warn("Nonexistant layout class [$class] specified for appender [$name]. Reverting to default layout.");
return;
}
$layout = new $class();
if (!($layout instanceof LoggerLayout)) {
$this->warn("Invalid layout class [$class] sepcified for appender [$name]. Reverting to default layout.");
return;
}
if (isset($config['params'])) {
$this->setOptions($layout, $config['params']);
}
$layout->activateOptions();
$appender->setLayout($layout);
}
/**
* Parses filter config, creates the filter and adds it to the appender's
* filter chain.
* @param LoggerAppender $appender
* @param array $config Filter configuration.
*/
private function createAppenderFilter(LoggerAppender $appender, $config) {
$name = $appender->getName();
$class = $config['class'];
if (!class_exists($class)) {
$this->warn("Nonexistant filter class [$class] specified on appender [$name]. Skipping filter definition.");
return;
}
$filter = new $class();
if (!($filter instanceof LoggerFilter)) {
$this->warn("Invalid filter class [$class] sepcified on appender [$name]. Skipping filter definition.");
return;
}
if (isset($config['params'])) {
$this->setOptions($filter, $config['params']);
}
$filter->activateOptions();
$appender->addFilter($filter);
}
/**
* Configures the root logger
* @see configureLogger()
*/
private function configureRootLogger(LoggerHierarchy $hierarchy, $config) {
$logger = $hierarchy->getRootLogger();
$this->configureLogger($logger, $config);
}
/**
* Configures a logger which is not root.
* @see configureLogger()
*/
private function configureOtherLogger(LoggerHierarchy $hierarchy, $name, $config) {
// Get logger from hierarchy (this creates it if it doesn't already exist)
$logger = $hierarchy->getLogger($name);
$this->configureLogger($logger, $config);
}
/**
* Configures a logger.
*
* @param Logger $logger The logger to configure
* @param array $config Logger configuration options.
*/
private function configureLogger(Logger $logger, $config) {
$loggerName = $logger->getName();
// Set logger level
if (isset($config['level'])) {
$level = LoggerLevel::toLevel($config['level']);
if (isset($level)) {
$logger->setLevel($level);
} else {
$this->warn("Invalid level value [{$config['level']}] specified for logger [$loggerName]. Ignoring level definition.");
}
}
// Link appenders to logger
if (isset($config['appenders'])) {
foreach($config['appenders'] as $appenderName) {
if (isset($this->appenders[$appenderName])) {
$logger->addAppender($this->appenders[$appenderName]);
} else {
$this->warn("Nonexistnant appender [$appenderName] linked to logger [$loggerName].");
}
}
}
// Set logger additivity
if (isset($config['additivity'])) {
try {
$additivity = LoggerOptionConverter::toBooleanEx($config['additivity'], null);
$logger->setAdditivity($additivity);
} catch (Exception $ex) {
$this->warn("Invalid additivity value [{$config['additivity']}] specified for logger [$loggerName]. Ignoring additivity setting.");
}
}
}
/**
* Helper method which applies given options to an object which has setters
* for these options (such as appenders, layouts, etc.).
*
* For example, if options are:
* <code>
* array(
* 'file' => '/tmp/myfile.log',
* 'append' => true
* )
* </code>
*
* This method will call:
* <code>
* $object->setFile('/tmp/myfile.log')
* $object->setAppend(true)
* </code>
*
* If required setters do not exist, it will produce a warning.
*
* @param mixed $object The object to configure.
* @param unknown_type $options
*/
private function setOptions($object, $options) {
foreach($options as $name => $value) {
$setter = "set$name";
if (method_exists($object, $setter)) {
$object->$setter($value);
} else {
$class = get_class($object);
$this->warn("Nonexistant option [$name] specified on [$class]. Skipping.");
}
}
}
/** Helper method to simplify error reporting. */
private function warn($message) {
trigger_error("log4php: $message", E_USER_WARNING);
}
}