Hey folks. If I register a flow, I get an identifi...
# prefect-communityd
David Haynes
04/27/2022, 8:20 PMHey folks. If I register a flow, I get an identifier back. How do I use that identifier to get the flow state information back from the service? I am probably just looking in the wrong place, but I can't find it in the docs.
k
Kevin Kho
04/27/2022, 8:27 PM
What information are you looking for specifically?
d
David Haynes
04/27/2022, 8:30 PMLike the state returned from flow.run(), specifically the success/fail of the flow and, optionally, the success/fail of the tasks in the flow.
k
Kevin Kho
04/27/2022, 8:31 PM
So there is a distinction between the flow id and flow run id. The flow id is the one you register, and one flow id corresponds to multiple runs so you want the flow run id.
You would need to hit the GraphQL API to fetch the information. Could you tell me though what the intention is? Are you looking for this to run after every Flow to get an alert? Are you only interested in Failure?
d
David Haynes
04/27/2022, 8:33 PMRight now, the use case is a flow with tasks a, b and c. Let's say, task b raises an exception. Is there some way to query the server to ask 'Did that flow succeed or fail?'
David Haynes
04/27/2022, 8:34 PMI guess that would be the flow run id. I'm not sure how to get that from a registered flow either.
David Haynes
04/27/2022, 8:35 PMBTW 1.0 not Orion.
David Haynes
04/27/2022, 8:40 PMYou know what? Never mind. I think using a state handler will do everything I need. Thanks for helping.
k
Kevin Kho
04/27/2022, 8:41 PM
Ok I am in the middle of typing a query but let me list the options:
1. State handlers -> the flow will report itself if a task succeeds or fails
2. Automations -> Prefect Cloud sees something failed then sends a message
3. Your own query after the flow runs (am working on an example)
Kevin Kho
04/27/2022, 8:44 PM
Copy code
query {
flow (where: {id: {_eq: "2c5a1658-8b21-4d4e-924a-e9e4f5e56786"}}) {
id
name
flow_runs (order_by: {start_time:desc},
limit:1){
id
name
start_time
}
}
}Kevin Kho
04/27/2022, 8:44 PM
This query gets the latest flow run for a given flow id. And then with that flow_run you can query the state of the task runs
d
David Haynes
04/27/2022, 8:46 PMThanks. That may come in useful in my next flow.
a
Anna Geller
04/27/2022, 9:21 PM
Is there some way to query the server to ask 'Did that flow succeed or fail?'You could also answer those questions by going to the UI - it might be easier that way
d
David Haynes
04/27/2022, 10:01 PMI don't think the UI would help in this case since I need the values programmatically.
👍 1
k
Kevin Kho
04/27/2022, 10:03 PM
Yeah the state handler will be easier because you can just use
prefect.context.flow_run_id23 Views