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<?php
/**
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://www.yiiframework.com/license/
 */

namespace yii\log;

use Yii;
use yii\base\Component;
use yii\base\ErrorHandler;

/**
 * Dispatcher manages a set of [[Target|log targets]].
 *
 * Dispatcher implements the [[dispatch()]]-method that forwards the log messages from a [[Logger]] to
 * the registered log [[targets]].
 *
 * An instance of Dispatcher is registered as a core application component and can be accessed using `Yii::$app->log`.
 *
 * You may configure the targets in application configuration, like the following:
 *
 * ```php
 * [
 *     'components' => [
 *         'log' => [
 *             'targets' => [
 *                 'file' => [
 *                     'class' => 'yii\log\FileTarget',
 *                     'levels' => ['trace', 'info'],
 *                     'categories' => ['yii\*'],
 *                 ],
 *                 'email' => [
 *                     'class' => 'yii\log\EmailTarget',
 *                     'levels' => ['error', 'warning'],
 *                     'message' => [
 *                         'to' => 'admin@example.com',
 *                     ],
 *                 ],
 *             ],
 *         ],
 *     ],
 * ]
 * ```
 *
 * Each log target can have a name and can be referenced via the [[targets]] property as follows:
 *
 * ```php
 * Yii::$app->log->targets['file']->enabled = false;
 * ```
 *
 * @property int $flushInterval How many messages should be logged before they are sent to targets. This
 * method returns the value of [[Logger::flushInterval]].
 * @property Logger $logger The logger. If not set, [[Yii::getLogger()]] will be used. Note that the type of
 * this property differs in getter and setter. See [[getLogger()]] and [[setLogger()]] for details.
 * @property int $traceLevel How many application call stacks should be logged together with each message.
 * This method returns the value of [[Logger::traceLevel]]. Defaults to 0.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class Dispatcher extends Component
{
    /**
     * @var array|Target[] the log targets. Each array element represents a single [[Target|log target]] instance
     * or the configuration for creating the log target instance.
     */
    public $targets = [];

/**
     * @var Logger|null the logger.
     */
    private $_logger;

/**
     * {@inheritdoc}
     */
    public function __construct($config = [])
    {
        // ensure logger gets set before any other config option
        if (isset($config['logger'])) {
            $this->setLogger($config['logger']);
            unset($config['logger']);
        }
        // connect logger and dispatcher
        $this->getLogger();

parent::__construct($config);
    }

/**
     * {@inheritdoc}
     */
    public function init()
    {
        parent::init();

foreach ($this->targets as $name => $target) {
            if (!$target instanceof Target) {
                $this->targets[$name] = Yii::createObject($target);
            }
        }
    }

/**
     * Gets the connected logger.
     * If not set, [[Yii::getLogger()]] will be used.
     * @property Logger the logger. If not set, [[Yii::getLogger()]] will be used.
     * @return Logger the logger.
     */
    public function getLogger()
    {
        if ($this->_logger === null) {
            $this->setLogger(Yii::getLogger());
        }

return $this->_logger;
    }

/**
     * Sets the connected logger.
     * @param Logger|string|array $value the logger to be used. This can either be a logger instance
     * or a configuration that will be used to create one using [[Yii::createObject()]].
     * If you are providing custom logger configuration and would like it to be used for the whole application
     * and not just for the dispatcher you should use [[Yii::setLogger()]] instead.
     */
    public function setLogger($value)
    {
        if (is_string($value) || is_array($value)) {
            $value = Yii::createObject($value);
        }

$this->_logger = $value;
        $this->_logger->dispatcher = $this;
    }

/**
     * @return int how many application call stacks should be logged together with each message.
     * This method returns the value of [[Logger::traceLevel]]. Defaults to 0.
     */
    public function getTraceLevel()
    {
        return $this->getLogger()->traceLevel;
    }

/**
     * @param int $value how many application call stacks should be logged together with each message.
     * This method will set the value of [[Logger::traceLevel]]. If the value is greater than 0,
     * at most that number of call stacks will be logged. Note that only application call stacks are counted.
     * Defaults to 0.
     */
    public function setTraceLevel($value)
    {
        $this->getLogger()->traceLevel = $value;
    }

/**
     * @return int how many messages should be logged before they are sent to targets.
     * This method returns the value of [[Logger::flushInterval]].
     */
    public function getFlushInterval()
    {
        return $this->getLogger()->flushInterval;
    }

/**
     * @param int $value how many messages should be logged before they are sent to targets.
     * This method will set the value of [[Logger::flushInterval]].
     * Defaults to 1000, meaning the [[Logger::flush()]] method will be invoked once every 1000 messages logged.
     * Set this property to be 0 if you don't want to flush messages until the application terminates.
     * This property mainly affects how much memory will be taken by the logged messages.
     * A smaller value means less memory, but will increase the execution time due to the overhead of [[Logger::flush()]].
     */
    public function setFlushInterval($value)
    {
        $this->getLogger()->flushInterval = $value;
    }

/**
     * Dispatches the logged messages to [[targets]].
     * @param array $messages the logged messages
     * @param bool $final whether this method is called at the end of the current application
     */
    public function dispatch($messages, $final)
    {
        $targetErrors = [];
        foreach ($this->targets as $target) {
            if (!$target->enabled) {
                continue;
            }
            try {
                $target->collect($messages, $final);
            } catch (\Throwable $t) {
                $target->enabled = false;
                $targetErrors[] = $this->generateTargetFailErrorMessage($target, $t, __METHOD__);
            } catch (\Exception $e) {
                $target->enabled = false;
                $targetErrors[] = $this->generateTargetFailErrorMessage($target, $e, __METHOD__);
            }
        }

if (!empty($targetErrors)) {
            $this->dispatch($targetErrors, true);
        }
    }

/**
     * Generate target error message
     *
     * @param Target $target log target object
     * @param \Throwable $throwable catched exception
     * @param string $method full method path
     * @return array generated error message data
     * @since 2.0.32
     */
    protected function generateTargetFailErrorMessage($target, $throwable, $method)
    {
        return [
            'Unable to send log via ' . get_class($target) . ': ' . ErrorHandler::convertExceptionToVerboseString($throwable),
            Logger::LEVEL_WARNING,
            $method,
            microtime(true),
            [],
        ];
    }
}