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Is it possible to execute an Action synchronously with the API?

Platform API
#1

I would like to execute an action and wait for the result using the REST API. Is that possible?

Is the StackStorm python client execution action asynchronous? How to be asynchronous?
#2

It’s possible to trigger an action execution via the API, check POST /api/v1/executions endpoint https://api.stackstorm.com/api/v1/executions/#/action_executions_controller.post

You have to poll however for action completion, having the id returned from the previous POST (create execution) request.

If you’ll try st2 run, - it has the same polling logic. For example:

st2 --debug run core.local 'sleep 10'

With the debug flag set, - it will show exactly which API requests st2client made, including polling for action completion.

You can re-use API requests from this command, - it’ll help you to bootstrap faster having the examples.

#3

I guess this is not called synchronously but thank you for the answer!

#4

Yes, that’s the only way to do it.

API can’t synchronously block and wait for Action to complete until it’s finished, - instead it just returns an execution id immediately that was triggered.
For example, what if action/workflow is running for hours/days? The response won’t survive the http/timeouts and won’t be delivered, if we talk about typical API call.

Hence, async.

BTW, there is an event stream one could listen on: https://api.stackstorm.com/stream/v1/stream/#/stream_controller.get_all for different events happening in the platform, incl. executions completion.

#5

Hi,
and what’s about using sensors, I mean, could we get a sync response using sensors (passive mode)? If no, how would sensor response be? I mean, an empty response like with webhooks or we would get an execution id like /v1/executions API

Thanks