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<?php
/**
* CLogger class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CLogger records log messages in memory.
*
* CLogger implements the methods to retrieve the messages with
* various filter conditions, including log levels and log categories.
*
* @property array $logs List of messages. Each array element represents one message
* with the following structure:
* array(
* [0] => message (string)
* [1] => level (string)
* [2] => category (string)
* [3] => timestamp (float, obtained by microtime(true));.
* @property float $executionTime The total time for serving the current request.
* @property integer $memoryUsage Memory usage of the application (in bytes).
* @property array $profilingResults The profiling results.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.logging
* @since 1.0
*/
class CLogger extends CComponent
{
const LEVEL_TRACE='trace';
const LEVEL_WARNING='warning';
const LEVEL_ERROR='error';
const LEVEL_INFO='info';
const LEVEL_PROFILE='profile';
/**
* @var integer how many messages should be logged before they are flushed to destinations.
* Defaults to 10,000, meaning for every 10,000 messages, the {@link flush} method will be
* automatically invoked once. If this is 0, it means messages will never be flushed automatically.
* @since 1.1.0
*/
public $autoFlush=10000;
/**
* @var boolean this property will be passed as the parameter to {@link flush()} when it is
* called in {@link log()} due to the limit of {@link autoFlush} being reached.
* By default, this property is false, meaning the filtered messages are still kept in the memory
* by each log route after calling {@link flush()}. If this is true, the filtered messages
* will be written to the actual medium each time {@link flush()} is called within {@link log()}.
* @since 1.1.8
*/
public $autoDump=false;
/**
* @var array log messages
*/
private $_logs=array();
/**
* @var integer number of log messages
*/
private $_logCount=0;
/**
* @var array log levels for filtering (used when filtering)
*/
private $_levels;
/**
* @var array log categories for filtering (used when filtering)
*/
private $_categories;
/**
* @var array the profiling results (category, token => time in seconds)
*/
private $_timings;
/**
* @var boolean if we are processing the log or still accepting new log messages
* @since 1.1.9
*/
private $_processing=false;
/**
* Logs a message.
* Messages logged by this method may be retrieved back via {@link getLogs}.
* @param string $message message to be logged
* @param string $level level of the message (e.g. 'Trace', 'Warning', 'Error'). It is case-insensitive.
* @param string $category category of the message (e.g. 'system.web'). It is case-insensitive.
* @see getLogs
*/
public function log($message,$level='info',$category='application')
{
$this->_logs[]=array($message,$level,$category,microtime(true));
$this->_logCount++;
if($this->autoFlush>0 && $this->_logCount>=$this->autoFlush && !$this->_processing)
{
$this->_processing=true;
$this->flush($this->autoDump);
$this->_processing=false;
}
}
/**
* Retrieves log messages.
*
* Messages may be filtered by log levels and/or categories.
* A level filter is specified by a list of levels separated by comma or space
* (e.g. 'trace, error'). A category filter is similar to level filter
* (e.g. 'system, system.web'). A difference is that in category filter
* you can use pattern like 'system.*' to indicate all categories starting
* with 'system'.
*
* If you do not specify level filter, it will bring back logs at all levels.
* The same applies to category filter.
*
* Level filter and category filter are combinational, i.e., only messages
* satisfying both filter conditions will be returned.
*
* @param string $levels level filter
* @param string $categories category filter
* @return array list of messages. Each array element represents one message
* with the following structure:
* array(
* [0] => message (string)
* [1] => level (string)
* [2] => category (string)
* [3] => timestamp (float, obtained by microtime(true));
*/
public function getLogs($levels='',$categories='')
{
$this->_levels=preg_split('/[\s,]+/',strtolower($levels),-1,PREG_SPLIT_NO_EMPTY);
$this->_categories=preg_split('/[\s,]+/',strtolower($categories),-1,PREG_SPLIT_NO_EMPTY);
if(empty($levels) && empty($categories))
return $this->_logs;
else if(empty($levels))
return array_values(array_filter($this->_logs,array($this,'filterByCategory')));
else if(empty($categories))
return array_values(array_filter($this->_logs,array($this,'filterByLevel')));
else
{
$ret=array_filter($this->_logs,array($this,'filterByLevel'));
return array_values(array_filter($ret,array($this,'filterByCategory')));
}
}
/**
* Filter function used by {@link getLogs}
* @param array $value element to be filtered
* @return boolean true if valid log, false if not.
*/
private function filterByCategory($value)
{
foreach($this->_categories as $category)
{
$cat=strtolower($value[2]);
if($cat===$category || (($c=rtrim($category,'.*'))!==$category && strpos($cat,$c)===0))
return true;
}
return false;
}
/**
* Filter function used by {@link getProfilingResults}
* @param array $value element to be filtered
* @return boolean true if valid timing entry, false if not.
*/
private function filterTimingByCategory($value)
{
foreach($this->_categories as $category)
{
$cat=strtolower($value[1]);
if($cat===$category || (($c=rtrim($category,'.*'))!==$category && strpos($cat,$c)===0))
return true;
}
return false;
}
/**
* Filter function used by {@link getLogs}
* @param array $value element to be filtered
* @return boolean true if valid log, false if not.
*/
private function filterByLevel($value)
{
return in_array(strtolower($value[1]),$this->_levels);
}
/**
* Returns the total time for serving the current request.
* This method calculates the difference between now and the timestamp
* defined by constant YII_BEGIN_TIME.
* To estimate the execution time more accurately, the constant should
* be defined as early as possible (best at the beginning of the entry script.)
* @return float the total time for serving the current request.
*/
public function getExecutionTime()
{
return microtime(true)-YII_BEGIN_TIME;
}
/**
* Returns the memory usage of the current application.
* This method relies on the PHP function memory_get_usage().
* If it is not available, the method will attempt to use OS programs
* to determine the memory usage. A value 0 will be returned if the
* memory usage can still not be determined.
* @return integer memory usage of the application (in bytes).
*/
public function getMemoryUsage()
{
if(function_exists('memory_get_usage'))
return memory_get_usage();
else
{
$output=array();
if(strncmp(PHP_OS,'WIN',3)===0)
{
exec('tasklist /FI "PID eq ' . getmypid() . '" /FO LIST',$output);
return isset($output[5])?preg_replace('/[\D]/','',$output[5])*1024 : 0;
}
else
{
$pid=getmypid();
exec("ps -eo%mem,rss,pid | grep $pid", $output);
$output=explode(" ",$output[0]);
return isset($output[1]) ? $output[1]*1024 : 0;
}
}
}
/**
* Returns the profiling results.
* The results may be filtered by token and/or category.
* If no filter is specified, the returned results would be an array with each element
* being array($token,$category,$time).
* If a filter is specified, the results would be an array of timings.
*
* Since 1.1.11, filtering results by category supports the same format used for filtering logs in
* {@link getLogs}, and similarly supports filtering by multiple categories and wildcard.
* @param string $token token filter. Defaults to null, meaning not filtered by token.
* @param string $categories category filter. Defaults to null, meaning not filtered by category.
* @param boolean $refresh whether to refresh the internal timing calculations. If false,
* only the first time calling this method will the timings be calculated internally.
* @return array the profiling results.
*/
public function getProfilingResults($token=null,$categories=null,$refresh=false)
{
if($this->_timings===null || $refresh)
$this->calculateTimings();
if($token===null && $categories===null)
return $this->_timings;
$timings = $this->_timings;
if($categories!==null) {
$this->_categories=preg_split('/[\s,]+/',strtolower($categories),-1,PREG_SPLIT_NO_EMPTY);
$timings=array_filter($timings,array($this,'filterTimingByCategory'));
}
$results=array();
foreach($timings as $timing)
{
if($token===null || $timing[0]===$token)
$results[]=$timing[2];
}
return $results;
}
private function calculateTimings()
{
$this->_timings=array();
$stack=array();
foreach($this->_logs as $log)
{
if($log[1]!==CLogger::LEVEL_PROFILE)
continue;
list($message,$level,$category,$timestamp)=$log;
if(!strncasecmp($message,'begin:',6))
{
$log[0]=substr($message,6);
$stack[]=$log;
}
else if(!strncasecmp($message,'end:',4))
{
$token=substr($message,4);
if(($last=array_pop($stack))!==null && $last[0]===$token)
{
$delta=$log[3]-$last[3];
$this->_timings[]=array($message,$category,$delta);
}
else
throw new CException(Yii::t('yii','CProfileLogRoute found a mismatching code block "{token}". Make sure the calls to Yii::beginProfile() and Yii::endProfile() be properly nested.',
array('{token}'=>$token)));
}
}
$now=microtime(true);
while(($last=array_pop($stack))!==null)
{
$delta=$now-$last[3];
$this->_timings[]=array($last[0],$last[2],$delta);
}
}
/**
* Removes all recorded messages from the memory.
* This method will raise an {@link onFlush} event.
* The attached event handlers can process the log messages before they are removed.
* @param boolean $dumpLogs whether to process the logs immediately as they are passed to log route
* @since 1.1.0
*/
public function flush($dumpLogs=false)
{
$this->onFlush(new CEvent($this, array('dumpLogs'=>$dumpLogs)));
$this->_logs=array();
$this->_logCount=0;
}
/**
* Raises an <code>onFlush</code> event.
* @param CEvent $event the event parameter
* @since 1.1.0
*/
public function onFlush($event)
{
$this->raiseEvent('onFlush', $event);
}
}
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