kronos
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Published
20 hours ago •
ostafen
ostafen
Cron jobs made easy via webhook notifications
Kronos
Kronos allows you to periodically invoke your webhooks using cron expressions.
Features:
- :zap: Easy to use REST API to schedule your webhooks;
- :alarm_clock: Complex scheduling using cron expressions;
- :mailbox_with_mail: Prometheus integration for getting failures notifications.
Build (Go 1.9+)
Run the following command
foo@bar$ make build
to build an executable which will be output to the bin subfolder.
Yaml file configuration
logging:
level: INFO
format: JSON
port: 9175
store:
path: "/path/to/db/file" # default is kronos.bolt
Docker compose configuration
services:
kronos:
image: ghcr.io/ostafen/kronos
ports:
- '9175:9175'
environment:
- PORT=9175 # configuration properties can be overridden through environment variables
- STORE_PATH=/data/kronos.bolt
volumes:
- ./data:/data
Registering a periodic schedule
To start getting some webhook notifications, let's add a new schedule which will be notified every minute:
curl -X POST localhost:9175/schedules -H 'Content-Type: application/json' -d \
'{
"title": "sample-schedule",
"description": "a sample schedule description",
"cronExpr": "0/1 * * * *",
"url": "your-webhook-address",
"isRecurring": true,
"startAt": "2023-02-19T11:34:00Z",
"endAt": "2023-02-19T11:38:00Z"
}'
On success, the response of the server will be similar to the following:
{
"id": "1e6d146b-e3b7-4e5c-b7ce-b7b2860f461b",
"title": "sample-schedule",
"status": "not_started",
"description": "a sample schedule description",
"cronExpr": "0/1 * * * *",
"url": "your-webhook-address",
"metadata": null,
"isRecurring": true,
"createdAt": "2023-02-19T12:32:30.788562107+01:00",
"runAt": "0001-01-01T00:00:00Z",
"startAt": "2023-02-19T11:34:00Z",
"endAt": "2023-02-19T11:38:00Z",
"nextScheduleAt": "2023-02-19T11:34:00Z",
}
The above table contains the full list of supported fields:
| Parameter | Required | Description |
|---|---|---|
| title | true | the name of your schedule. It must be unique. |
| description | false | an optional description of your schedule. |
| isRecurring | false | whether the schedule is recurring or not. |
| cronExpr | if isRecurring = true | cron expression for recurring schedules. |
| url | true | webhook notification endpoint. |
| runAt | if isRecurring = false | for non-recurring schedules, it indicates the instant the schedule will be triggered at. |
| startAt | false | UTC start date of the schedule. Must be equal to runAt if isRecurring = false. |
| endAt | false | UTC end date of the schedule. Must be equal to runAt if isRecurring = false. |
| metadata | false | optional metadata which will be sent when triggering a webhook. |
REST API
-
POST
/schedules- Register a new schedule -
GET
/schedules/{id}- Get details about an already existing schedule -
DELETE
/schedules/{id}- Delete a schedule -
POST
/schedules/{id}/pause- Pause an active schedule -
POST
/schedules/{id}/resume- Resume a paused schedule -
POST
/schedules/{id}/trigger- Immediately trigger a notification for a given schedule
Contact
Stefano Scafiti @ostafen
License
Kronos source code is available under the MIT License.
ostafen