Unofficial Faktory Cron Scheduler

faktory-cron is a simple tool to send jobs to a Faktory work server on a repeating schedule, with a cron like syntax.

Installation

faktory-cron is a single binary, download the latest version for Linux, macOS or Windows.

Usage

A config file (crontab.yaml) provides a list of jobs and the schedule they should run on. For example:

faktory: tcp://localhost:7419
jobs:
  - job: test
    schedule: "@every 30s"
    args:
      - test
  - job: test
    schedule: 5 * * * *
    args:
      - 1
      - 2
    retries: 1
    queue: default
    priority: 5

To run your jobs on these schedules, point faktory-cron at the file:

$ ./faktory-cron -config path/to/crontab.yaml

If you have a file called crontab.yaml in the current directory, then you can skip the -config option.

Job options

These are the configuration options for each job:

Setting	Required	Description
job	✓	The name of the job, as registered with Faktory
schedule	✓	See below
args	✓	A list of arguments to send to the job
retries	✗	Number of times Faktory will retry the job (if it fails)
queue	✗	The queue in which this job should be placed. Will be placed in the default queue if not supplied.
priority	✗	Can be between 1 and 9. Defaults to 5, jobs with a higher priority will skip the queue.

Cron syntax

See this link for a full reference, but in short:

Field name	Mandatory?	Allowed values	Allowed special characters
Seconds	Yes	0-59	* / , -
Minutes	Yes	0-59	* / , -
Hours	Yes	0-23	* / , -
Day of month	Yes	1-31	* / , - ?
Month	Yes	1-12 or JAN-DEC	* / , -
Day of week	Yes	0-6 or SUN-SAT	* / , - ?

Interval syntax

Interal jobs may be defined by using @every, as in:

@every 30m

@every 30s

You may also use @daily, @hourly, @weekly, @monthly and so on.

Connecting to Faktory

If the faktory setting isn't in the config file, then faktory-cron will use the FAKTORY_URL environment variable.

Connections are made lazily, so if you restart Faktory then you don't need to restart faktory-cron.

Docker

There is a Docker container at cdrx/faktory-cron, you can use it like this:

docker run -v path/to/crontab.yaml:/crontab.yaml -e FAKTORY_URL=tcp://:password@faktory:7419 cdrx/faktory-cron

You'll need to supply it a config file with the schedules and point it at faktory so it can queue the jobs.

Limitations

If you run more than one copy of faktory-cron from the same config file, then tasks will be duplicated. Only run one copy of the service at a time.

Faktory doesn't provide any mechanism (yet) to check if a job has finished. If your job doesn't finish before the next one is scheduled, it will start two copies of the job.

Contributing

Contributions welcome, particularly for things from this list:

Tests
Live reloading if the config file changes
Supporting multiple configuration files in a folder, possibly with cron like folders (ala /etc/cron/daily.d)
Documentation

History

0.5 - 2017-11-28

First release, works for me. Feedback would be appreciated.

License

BSD, see the LICENSE file.

cdrx/faktory_cron