<?php
/**
* Target class file.
*
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2012 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\logging;
/**
* Target is the base class for all log target classes.
*
* A log target object will filter the messages logged by [[Logger]] according
* to its [[levels]] and [[categories]] properties. It may also export the filtered
* messages to specific destination defined by the target, such as emails, files.
*
* Level filter and category filter are combinatorial, i.e., only messages
* satisfying both filter conditions will be handled. Additionally, you
* may specify [[except]] to exclude messages of certain categories.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
abstract class Target extends \yii\base\Component
{
/**
* @var boolean whether to enable this log target. Defaults to true.
*/
public $enabled = true;
/**
* @var array list of message levels that this target is interested in. Defaults to empty, meaning all levels.
*/
public $levels = array();
/**
* @var array list of message categories that this target is interested in. Defaults to empty, meaning all categories.
* You can use an asterisk at the end of a category so that the category may be used to
* match those categories sharing the same common prefix. For example, 'yii\db\*' will match
* categories starting with 'yii\db\', such as 'yii\db\dao\Connection'.
*/
public $categories = array();
/**
* @var array list of message categories that this target is NOT interested in. Defaults to empty, meaning no uninteresting messages.
* If this property is not empty, then any category listed here will be excluded from [[categories]].
* You can use an asterisk at the end of a category so that the category can be used to
* match those categories sharing the same common prefix. For example, 'yii\db\*' will match
* categories starting with 'yii\db\', such as 'yii\db\dao\Connection'.
* @see categories
*/
public $except = array();
/**
* @var boolean whether to prefix each log message with the current session ID. Defaults to false.
*/
public $prefixSession = false;
/**
* @var boolean whether to prefix each log message with the current user name and ID. Defaults to false.
* @see \yii\web\User
*/
public $prefixUser = false;
/**
* @var boolean whether to log a message containing the current user name and ID. Defaults to false.
* @see \yii\web\User
*/
public $logUser = false;
/**
* @var array list of the PHP predefined variables that should be logged in a message.
* Note that a variable must be accessible via `$GLOBALS`. Otherwise it won't be logged.
* Defaults to `array('_GET', '_POST', '_FILES', '_COOKIE', '_SESSION', '_SERVER')`.
*/
public $logVars = array('_GET', '_POST', '_FILES', '_COOKIE', '_SESSION', '_SERVER');
/**
* @var boolean whether this target should export the collected messages to persistent storage
* (e.g. DB, email) whenever [[processMessages()]] is called. Defaults to true. If false,
* the collected messages will be stored in [[messages]] without any further processing.
*/
public $autoExport = true;
/**
* @var array the messages that are retrieved from the logger so far by this log target.
* @see autoExport
*/
public $messages = array();
/**
* Exports log messages to a specific destination.
* Child classes must implement this method. Note that you may need
* to clean up [[messages]] in this method to avoid re-exporting messages.
* @param boolean $final whether this method is called at the end of the current application
*/
abstract public function exportMessages($final);
/**
* Processes the given log messages.
* This method will filter the given messages with [[levels]] and [[categories]].
* And if requested, it will also export the filtering result to specific medium (e.g. email).
* @param array $messages log messages to be processed. See [[Logger::messages]] for the structure
* of each message.
* @param boolean $final whether this method is called at the end of the current application
*/
public function processMessages($messages, $final)
{
$messages = $this->filterMessages($messages);
$this->messages = array_merge($this->messages, $messages);
if (!empty($this->messages) && ($this->autoExport || $final)) {
$this->prepareExport($final);
$this->exportMessages($final);
$this->messages = array();
}
}
/**
* Prepares the [[messages]] for exporting.
* This method will modify each message by prepending extra information
* if [[prefixSession]] and/or [[prefixUser]] are set true.
* It will also add an additional message showing context information if
* [[logUser]] and/or [[logVars]] are set.
* @param boolean $final whether this method is called at the end of the current application
*/
protected function prepareExport($final)
{
$prefix = array();
if ($this->prefixSession && ($id = session_id()) !== '') {
$prefix[] = "[$id]";
}
if ($this->prefixUser && ($user = \Yii::$application->getComponent('user', false)) !== null) {
$prefix[] = '[' . $user->getName() . ']';
$prefix[] = '[' . $user->getId() . ']';
}
if ($prefix !== array()) {
$prefix = implode(' ', $prefix);
foreach ($this->messages as $i => $message) {
$this->messages[$i][0] = $prefix . ' ' . $this->messages[$i][0];
}
}
if ($final && ($context = $this->getContextMessage()) !== '') {
$this->messages[] = array($context, Logger::LEVEL_INFO, 'application', YII_BEGIN_TIME);
}
}
/**
* Generates the context information to be logged.
* The default implementation will dump user information, system variables, etc.
* @return string the context information. If an empty string, it means no context information.
*/
protected function getContextMessage()
{
$context = array();
if ($this->logUser && ($user = \Yii::$application->getComponent('user', false)) !== null) {
$context[] = 'User: ' . $user->getName() . ' (ID: ' . $user->getId() . ')';
}
foreach ($this->logVars as $name) {
if (!empty($GLOBALS[$name])) {
$context[] = "\${$name} = " . var_export($GLOBALS[$name], true);
}
}
return implode("\n\n", $context);
}
/**
* Filters the given messages according to their categories and levels.
* @param array $messages messages to be filtered
* @return array the filtered messages.
* @see filterByCategory
* @see filterByLevel
*/
protected function filterMessages($messages)
{
foreach ($messages as $i => $message) {
if (!empty($this->levels) && !in_array($message[1], $this->levels)) {
unset($messages[$i]);
continue;
}
$matched = empty($this->categories);
foreach ($this->categories as $category) {
$prefix = rtrim($category, '*');
if (strpos($message[2], $prefix) === 0 && ($message[2] === $category || $prefix !== $category)) {
$matched = true;
break;
}
}
if ($matched) {
foreach ($this->except as $category) {
$prefix = rtrim($category, '*');
foreach ($messages as $i => $message) {
if (strpos($message[2], $prefix) === 0 && ($message[2] === $category || $prefix !== $category)) {
$matched = false;
break;
}
}
}
}
if (!$matched) {
unset($messages[$i]);
}
}
return $messages;
}
/**
* Formats a log message.
* The message structure follows that in [[Logger::messages]].
* @param array $message the log message to be formatted.
* @return string the formatted message
*/
public function formatMessage($message)
{
$s = is_string($message[0]) ? $message[0] : var_export($message[0], true);
return date('Y/m/d H:i:s', $message[3]) . " [{$message[1]}] [{$message[2]}] $s\n";
}
}