Scheduled Events
Jets supports Scheduled Events. This allows you to have a Lambda function run on a scheduled based. The scheduled event is a Amazon EventBridge rule.
Example
Generate code.
jets generate job hard --type scheduled
It looks something like this.
app/jobs/hard_job.rb
class HardJob < ApplicationJob
rate "10 hours"
def perform
puts "Do something with event #{event}"
end
end
You can use cron-like expressions
cron(0 12 * * ? *) # runs every day at 12:00pm UTC
cron(5,35 14 * * ? *) # runs every day, at 2:05pm and 2:35pm UTC
cron(15 10 ? * 6L 2019-2022) # runs at 10:15am UTC on the last Friday of
# each month during the years 2019 to 2022
Note: The AWS Cron syntax is slightly different from the Linux cron syntax.
You can also use rate expresions
rate(1 minute)
rate(5 minutes)
rate(1 hour)
rate(1 day)
Note: Notice the singular 1 minute vs plural 5 minutes. It matters.
Tailing Logs
It helps to tail the logs and watch the event as it comes through.
jets logs -f -n hard_job-perform
Event Payloads
The event payload from the Scheduled Event is pretty simple.
event
{
"version": "0",
"id": "3a0b6d51-b30a-7d45-1468-acc58fff5558",
"detail-type": "Scheduled Event",
"source": "aws.events",
"account": "1122334455",
"time": "2023-12-24T15:48:05Z",
"region": "us-west-2",
"resources": [
"arn:aws:events:us-west-2:1122334455:rule/demo-dev-HardJob-1VH3QUF-HardJobPerformEventsRule-X2ZUwbcS7f5J"
],
"detail": {}
}