Greg,
This is really not a new discussion. Particularly, we’ve already discussed
EventScheduler thing before with heat folks
(http://lists.openstack.org/pipermail/openstack-dev/2013-November/019150.html).
We agreed that EventScheduler doesn’t make a lot of sense alone after Mistral
came into play. It’s because EventScheduler only describes calling webhooks on
schedule and nothing else. Mistral already has this functionality just because
it’s a part of its core idea. Timer events is just one of the event types
Mistral is going to support (there will also be others like Ceilometer alarms).
And one of the simple use case of Mistral would be exactly “calling a webhook
on schedule”. Since Mistral uses DSL as a main interaction means with a user
the team decided to implement ideas of EventScheduler as a part of Mistral DSL
as well. Here’s the simple Mistral DSL that describes basically the same as
described in EventScheduler:
Services:
MyRest:
type: REST_API
parameters:
baseUrl: http://localhost:8988/my_service
actions:
my-action:
parameters:
url: /my-action
method: GET
Workflow:
tasks:
my-task:
action: MyRest:my-action
events:
my-task:
type: periodic
tasks: my-task
parameters:
cron-pattern: "*/1 * * * *"
I really hope it’s self-explaining enough (if not, let us know what is not
clear or what you don’t like, we’ll improve it). Basically, to make this simple
DSL snippet work we just need to upload it to Mistral via REST API. Just want
to repeat: this already works. To simplify this even more for use cases like
yours we also have an idea of providing some API sugar like scheduling webhook
calls using special REST API action like:
http POST /webhooks
{
“name”: “my every minute webhook”,
“webhook": “http://my.webhook.host/someurl”,
“schedule”: {
“cron”: “* * * * *"
}
}
And under the hood Mistral would just generate a workflow definition similar to
provided above.
So my main point here that I was trying to make is that EventScheduler is just
a special case of Mistral capabilities. We can just provide a convenience for
scheduling webhook calls on the API (a couple of hours to implement).
Thanks! Happy New Year to everyone!
Renat Akhmerov
@ Mirantis Inc.
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