Simple job scheduler with crontab patterns for Crystal Language.
Add this to your application's shard.yml:
dependencies:
cron_scheduler:
github: kostya/cron_schedulerrequire "cron_scheduler"
require "log"
CronScheduler.define do
# normal crontab syntax, 5 tokens (minute, hour, day, month, wday)
at("* * * * *") { Log.info { "every 1 minute" } }
at("*/5 20-23 * * *") { Log.info { "every 5 minutes between 20-23 hours" } }
at("*/2 */3 * * *") { Log.info { "every 2 minute every 3 hours" } }
at("45 * * * *") { Log.info { "every hour at :45" } }
at("* * * * SUN") { Log.info { "every 1 minute in sunday" } }
# I added extra syntax, when 6 tokens, first one parsed as seconds
# (second, minute, hour, day, month, wday)
at("*/3 * * * * *") { Log.info { "every 3.seconds" } }
at("20-45/5 * * * * *") { Log.info { "every 5.seconds between 20-45" } }
at("11,22,33,44-60/2 * * * * *") { Log.info { "every 11,22,33,44-60/2 seconds" } }
end
Log.info { "Scheduler started" }
# sleep will prevent exiting at the end of the script
sleep
