SimulationController.php

<?php
namespace console\controllers;


use yii\helpers\StringHelper;
use yii\console\Controller;
use Yii;

abstract class SimulationController extends Controller {
    public $defaultAction = 'default';

    public $simulationMethodPrefix = 'sim';

    public function actionOn() {
        self::setStatus(true);
    }

    public function actionOff() {
        self::setStatus(false);
    }

    public function actionRun($min, $max) {
        return $this->runSimulation($min, $max, function () {
            return true;
        });
    }

    public function actionDefault($min = 3, $max = 15) {
        try {
            return $this->runSimulation($min, $max, function () {
                return self::getStatus();
            });
        } catch (\Exception $e) {
            self::setStatus(false);
            throw $e;
        }
    }

    protected function runSimulation($min, $max, $condition) {
        try {
            if ($condition()) {
                $this->randomMethod();
            }
        } catch (\Exception $e) {
            Yii::error($e->getMessage(), self::class);
        }
        sleep(rand($min, $max));
        return $this->runSimulation($min, $max, $condition);
    }

    public static function setStatus($flag) {
        if ($flag !== self::getStatus()) {
            $flag
                ? self::start()
                : self::stop();
        }
    }

    public static function getStatus() {
        if (file_exists(self::getMarker())) {
            $pid = intval(trim(file_get_contents(self::getMarker())));
            if (self::pidExists($pid)) {
                return true;
            }
        }
        return false;
    }

    public static function getMarker() {
        return dirname(Yii::getAlias("@app")) . "/console/runtime/simulate.on";
    }

    public static function pidExists($pid) {
        return boolval(exec('if kill -0 ' . $pid . ' >/dev/null 2>&1; then eval "echo 1"; else eval "echo 0"; fi'));
    }

    public static function start() {
        if (file_exists(self::getMarker())) {
            unlink(self::getMarker());
        }
        $yii = dirname(Yii::getAlias("@app")) . '/yii';
        $file = self::getMarker();
        $cmd = "nohup $yii simulate > /dev/null 2>&1 & echo $! > $file";
        exec($cmd);
    }

    public static function stop() {
        if (file_exists(self::getMarker())) {
            $pid = intval(trim(file_get_contents(self::getMarker())));
            exec("kill $pid");
            unlink(self::getMarker());
        }
    }

    public function randomMethod() {
        $methods = array_filter(get_class_methods($this), function ($name) {
            return StringHelper::startsWith($name, $this->simulationMethodPrefix);
        });
        $this->{$methods[array_rand($methods)]}();
    }
  }
}