* @since 2.0 */ abstract class Target extends Component { /** * @var boolean whether to enable this log target. Defaults to true. */ public $enabled = true; /** * @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\Connection'. */ public $categories = []; /** * @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\Connection'. * @see categories */ public $except = []; /** * @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 `['_GET', '_POST', '_FILES', '_COOKIE', '_SESSION', '_SERVER']`. */ public $logVars = ['_GET', '_POST', '_FILES', '_COOKIE', '_SESSION', '_SERVER']; /** * @var integer how many messages should be accumulated before they are exported. * Defaults to 1000. Note that messages will always be exported when the application terminates. * Set this property to be 0 if you don't want to export messages until the application terminates. */ public $exportInterval = 1000; /** * @var array the messages that are retrieved from the logger so far by this log target. * Please refer to [[Logger::messages]] for the details about the message structure. */ public $messages = []; private $_levels = 0; /** * Exports log [[messages]] to a specific destination. * Child classes must implement this method. */ abstract public function export(); /** * 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 $final whether this method is called at the end of the current application */ public function collect($messages, $final) { $this->messages = array_merge($this->messages, $this->filterMessages($messages, $this->getLevels(), $this->categories, $this->except)); $count = count($this->messages); if ($count > 0 && ($final || $this->exportInterval > 0 && $count >= $this->exportInterval)) { if (($context = $this->getContextMessage()) !== '') { $this->messages[] = [$context, Logger::LEVEL_INFO, 'application', YII_BEGIN_TIME]; } $this->export(); $this->messages = []; } } /** * 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() { $context = []; if ($this->logUser && ($user = Yii::$app->getComponent('user', false)) !== null) { /** @var \yii\web\User $user */ $context[] = 'User: ' . $user->getId(); } foreach ($this->logVars as $name) { if (!empty($GLOBALS[$name])) { $context[] = "\${$name} = " . var_export($GLOBALS[$name], true); } } return implode("\n\n", $context); } /** * @return integer the message levels that this target is interested in. This is a bitmap of * level values. Defaults to 0, meaning all available levels. */ public function getLevels() { return $this->_levels; } /** * Sets the message levels that this target is interested in. * * The parameter can be either an array of interested level names or an integer representing * the bitmap of the interested level values. Valid level names include: 'error', * 'warning', 'info', 'trace' and 'profile'; valid level values include: * [[Logger::LEVEL_ERROR]], [[Logger::LEVEL_WARNING]], [[Logger::LEVEL_INFO]], * [[Logger::LEVEL_TRACE]] and [[Logger::LEVEL_PROFILE]]. * * For example, * * ~~~ * ['error', 'warning'] * // which is equivalent to: * Logger::LEVEL_ERROR | Logger::LEVEL_WARNING * ~~~ * * @param array|integer $levels message levels that this target is interested in. * @throws InvalidConfigException if an unknown level name is given */ public function setLevels($levels) { static $levelMap = [ 'error' => Logger::LEVEL_ERROR, 'warning' => Logger::LEVEL_WARNING, 'info' => Logger::LEVEL_INFO, 'trace' => Logger::LEVEL_TRACE, 'profile' => Logger::LEVEL_PROFILE, ]; if (is_array($levels)) { $this->_levels = 0; foreach ($levels as $level) { if (isset($levelMap[$level])) { $this->_levels |= $levelMap[$level]; } else { throw new InvalidConfigException("Unrecognized level: $level"); } } } else { $this->_levels = $levels; } } /** * Filters the given messages according to their categories and levels. * @param array $messages messages to be filtered * @param integer $levels the message levels to filter by. This is a bitmap of * level values. Value 0 means allowing all levels. * @param array $categories the message categories to filter by. If empty, it means all categories are allowed. * @param array $except the message categories to exclude. If empty, it means all categories are allowed. * @return array the filtered messages. */ public static function filterMessages($messages, $levels = 0, $categories = [], $except = []) { foreach ($messages as $i => $message) { if ($levels && !($levels & $message[1])) { unset($messages[$i]); continue; } $matched = empty($categories); foreach ($categories as $category) { if ($message[2] === $category || substr($category, -1) === '*' && strpos($message[2], rtrim($category, '*')) === 0) { $matched = true; break; } } if ($matched) { foreach ($except as $category) { $prefix = rtrim($category, '*'); 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) { list($text, $level, $category, $timestamp) = $message; $level = Logger::getLevelName($level); if (!is_string($text)) { $text = var_export($text, true); } $ip = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '127.0.0.1'; return date('Y/m/d H:i:s', $timestamp) . " [$ip] [$level] [$category] $text"; } }