README

A scheduled task manager for yii2

Installation

The preferred way to install this extension is through composer.

Install using the following command.

$ composer require panix/mod-scheduler

Now that the package has been installed you need to configure the module in your application

The config/console.php file should be updated to reflect the changes below

    'bootstrap' => ['log', 'scheduler'],
    'modules' => [
        'scheduler' => ['class' => 'panix\mod\scheduler\Module'],
    ],
    'components' => [
        'errorHandler' => [
            'class' => 'panix\mod\scheduler\ErrorHandler'
        ],
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\EmailTarget',
                    'mailer' =>'mailer',
                    'levels' => ['error', 'warning'],
                    'message' => [
                        'to' => ['admin@example.com'],
                        'from' => [$params['adminEmail']],
                        'subject' => 'Scheduler Error - ####SERVERNAME####'
                    ],
                    'except' => [
                    ],
                ],
            ],
        ],
    ]

also add this to the top of your config/console.php file

\yii\base\Event::on(
    \panix\mod\scheduler\console\SchedulerController::className(),
    \panix\mod\scheduler\events\SchedulerEvent::EVENT_AFTER_RUN,
    function ($event) {
        if (!$event->success) {
            foreach($event->exceptions as $exception) {
                throw $exception;
            }
        }
    }
);

To implement the GUI for scheduler also add the following to your config/web.php

    'bootstrap' => ['log', 'scheduler'],
    'modules' => [
        'scheduler' => ['class' => 'panix\mod\scheduler\Module'],
    ],

After the configuration files have been updated, a tasks directory will need to be created in the root of your project.

Run the database migrations, which will create the necessary tables for scheduler

php yii migrate up --migrationPath=vendor/webtoolsnz/yii2-scheduler/src/migrations

Add a controller

<?php

namespace app\modules\admin\controllers;

use yii\web\Controller;

/**
 * Class SchedulerController
 * @package app\modules\admin\controllers
 */
class SchedulerController extends Controller
{
    public function actions()
    {
        return [
            'index' => [
                'class' => 'panix\mod\scheduler\actions\IndexAction',
                'view' => '@scheduler/views/index',
            ],
            'update' => [
                'class' => 'panix\mod\scheduler\actions\UpdateAction',
                'view' => '@scheduler/views/update',
            ],
            'view-log' => [
                'class' => 'panix\mod\scheduler\actions\ViewLogAction',
                'view' => '@scheduler/views/view-log',
            ],
        ];
    }
}

Example Task

You can now create your first task using scheduler, create the file AlphabetTask.php inside the tasks directory in your project root.

Paste the below code into your task:

<?php
namespace app\tasks;

/**
 * Class AlphabetTask
 * @package app\tasks
 */
class AlphabetTask extends \panix\mod\scheduler\Task
{
    public $description = 'Prints the alphabet';
    public $schedule = '0 * * * *';
    public function run()
    {
        foreach (range('A', 'Z') as $letter) {
            echo $letter;
        }
    }
}

The above code defines a simple task that runs at the start of every hour, and prints the alphabet.

The $schedule property of this class defines how often the task will run, these are simply Cron Expression

Running the tasks

Scheduler provides an intuitive CLI for executing tasks, below are some examples

 # list all tasks and their status
 $ php yii scheduler

 # run the task if due
 $ php yii scheduler/run --taskName=AlphabetTask

 # force the task to run regardless of schedule
 $ php yii scheduler/run --taskName=AlphabetTask --force

 # run all tasks
 $ php yii scheduler/run-all

 # force all tasks to run
 $ php yii scheduler/run-all --force

In order to have your tasks run automatically simply setup a crontab like so

*/5 * * * * admin php /path/to/my/app/yii scheduler/run-all > /dev/null &

Events & Errors

Events are thrown before and running individual tasks as well as at a global level for multiple tasks

Task Level

Event::on(AlphabetTask::className(), AlphabetTask::EVENT_BEFORE_RUN, function ($event) {
    Yii::trace($event->task->className . ' is about to run');
});
Event::on(AlphabetTask::className(), AlphabetTask::EVENT_AFTER_RUN, function ($event) {
    Yii::trace($event->task->className . ' just ran '.($event->success ? 'successfully' : 'and failed'));
});

or at the global level, to throw errors in /yii

$application->on(\panix\mod\scheduler\events\SchedulerEvent::EVENT_AFTER_RUN, function ($event) {
    if (!$event->success) {
        foreach($event->exceptions as $exception) {
            throw $exception;
        }
    }
});

You could throw the exceptions at the task level, however this will prevent further tasks from running.

License

The MIT License (MIT). Please see LICENSE for more information.