php_crontab

php crontab base on pcntl and react/event-loop

Why use php_crontab?

When we have a handful of crontab tasks, crontab service is enough for us to manage them. If we have many crontab tasks, there will be some problems like:

The crontab tasks are managed in a text file. If there are no comment, it will be hard for fresh man to understand what they are.
If the crontab tasks are distributed in different servers, it will be hard to manage them.
If you want to collect the crontab tasks' logs, it will be not easy.
Tasks of different users must written in different files. Based on the above reasons, we need a crontab manager which can manage crontab tasks together and configure the tasks.

How to use php_crontab?

First composer require jenner/crontab.
There are two ways to use php_crontab to manage your crontab tasks. You can just write a php script and add it to the crontab config file with the command crontab -e. The php script should run every minute. For example tests/simple.php
Or you can write a php daemon script which will run as a service and will not exit until someone kill it. It will check the tasks every minute. For example tests/daemon.php

Import

composer require jenner/crontab

Properties

The crontab tasks can be stored in any way you what. For example, mysql, reids. What's more? You can develop a web application to manage them.
The tasks of different users can be managed together.
Multi-Process, every task is a process.
You can set the user and group of a crontab task
STDOUT can be redirected
Based on react/event-loop, it can run as a daemon.
A HTTP server which you can manage the crontab tasks through it.
Dynamic task loader, you can register a task loader by Daemon::registerTaskLoader, which will execute every 60 seconds and update the crontab tasks.

HTTP interfaces

HTTP METHOD: GET

add add new task to crontab server
get_by_name get task by name
remove_by_name remove task by name
clear clear all task
get get all tasks
start start crontab loop
stop stop crontab loop

Examples:

http://host:port/add?name=name&cmd=cmd&time=time&out=out&user=user&group=group&comment=comment
http://host:port/get_by_name?name=name
http://host:port/remove_by_name?name=name
http://host:port/clear
http://host:port/get
http://host:port/start
http://host:port/stop

TODO

add log handler interface.
add http log handler, socket log handler, file handler and so on.
separate stdout and stderr. use different handlers

run based on crontab service

* * * * * php demo.php

<?php
$missions = [
    [
        'name' => 'ls',
        'cmd' => "ls -al",
        'out' => '/tmp/php_crontab.log',
        'err' => '/tmp/php_crontab.log',
        'time' => '* * * * *',
        'user' => 'www',
        'group' => 'www'
    ],
    [
        'name' => 'ls',
        'cmd' => "ls -al",
        'out' => '/tmp/php_crontab.log',
        'err' => '/tmp/php_crontab.log',
        'time' => '* * * * *',
        'user' => 'www',
        'group' => 'www'
    ],
];

$tasks = array();
foreach($missions as $mission){
    $tasks[] = new \Jenner\Crontab\Mission($mission['name'], $mission['cmd'], $mission['time'], $mission['out']);
}

$crontab_server = new \Jenner\Crontab\Crontab(null, $tasks);
$crontab_server->start(time());

run as a daemon

it will check the task configs every minute.

$missions = [
    [
        'name' => 'ls',
        'cmd' => "ls -al",
        'out' => '/tmp/php_crontab.log',
        'err' => '/tmp/php_crontab.log',
        'time' => '* * * * *',
        'user' => 'www',
        'group' => 'www'
    ],
    [
        'name' => 'ls',
        'cmd' => "ls -al",
        'out' => '/tmp/php_crontab.log',
        'err' => '/tmp/php_crontab.log',
        'time' => '* * * * *',
        'user' => 'www',
        'group' => 'www'
    ],
];

$daemon = new \Jenner\Crontab\Daemon($missions);
$daemon->start();

Or use the task loader

function task_loader() {
    $missions = [
        [
            'name' => 'ls',
            'cmd' => "ls -al",
            'out' => '/tmp/php_crontab.log',
            'time' => '* * * * *',
            'user' => 'www',
            'group' => 'www'
        ],
        [
            'name' => 'ls',
            'cmd' => "ls -al",
            'out' => '/tmp/php_crontab.log',
            'time' => '* * * * *',
            'user' => 'www',
            'group' => 'www'
        ],
    ];

    return $missions;
}

$daemon = new \Jenner\Crontab\Daemon();
$daemon->registerTaskLoader("task_loader");
$daemon->start();

run as a daemon and start the http server

$missions = [
    [
        'name' => 'ls',
        'cmd' => "ls -al",
        'out' => '/tmp/php_crontab.log',
        'err' => '/tmp/php_crontab.log',
        'time' => '* * * * *',
        'user' => 'www',
        'group' => 'www'
    ],
    [
        'name' => 'ls',
        'cmd' => "ls -al",
        'out' => '/tmp/php_crontab.log',
        'err' => '/tmp/php_crontab.log',
        'time' => '* * * * *',
        'user' => 'www',
        'group' => 'www'
    ],
];

$http_daemon = new \Jenner\Crontab\HttpDaemon($missions, "php_crontab.log");
$http_daemon->start($port = 6364);

Then you can manage the crontab task by curl like:

curl http://127.0.0.1:6364/get_by_name?name=ls
curl http://127.0.0.1:6364/remove_by_name?name=hostname
curl http://127.0.0.1:6364/get

run the script

[root@jenner php_crontab]# ./bin/php_crontab 
php_crontab help:
-c  --config    crontab tasks config file
-p  --port      http server port
-f  --pid-file  daemon pid file
-l  --log       crontab log file
[root@jenner php_crontab]#nohup ./bin/php_crontab -c xxoo.php -p 8080 -f /var/php_crontab.pid -l /var/logs/php_crontab.log >/dev/null &

blog:www.huyanping.cn