Hello everyone! In a production environment that we have, we do not have access to the prefect UI and need to use the

prefect

CLI tool to do things like check which flows are running and see their logs. If a flow is running and I want to cancel it, how could I do this? There doesn't seem to be a command, and I'm assuming I need to do it with graphql. Is there an example of how to do this anyway? I appreciate it in advance.

Hey @William Grim, this is the query that the UI uses to cancel a flow run. Just supply the flow run id. You can also use the Prefect Client maybe. There is a method there to do it

cancel_flow_run

.

Oh cool! And I haven't attempted to run these queries directly. Is it something like an http post or anything?

Pretty much. You can do something like this:

query = """query {flow{ name, id}}"""


url = '<https://api.prefect.io>'
r = <http://requests.post|requests.post>(url, json={'query': query}, headers={"authorization": "Bearer MY_TOKEN_HERE"})
print(r.status_code)
print(r.text)

But the Client is already authenticated for you. I think you’re thinking of just cURL directly? I think it might work.

Yeah, I was thinking of something like curl, but I can build on what you've written here.

Of course!

Just a quick follow-up that it doesn't seem like our graphql server even has auth tokens setup, which is something we'll have to rectify. But, at the very least, 3 lines of code was able to cancel a flow from a box that had the prefect libs installed:

from prefect.client import Client
client = Client("<https://myurlhere>:myport")
client.cancel_flow_run("my_uuid_here")

If you are using Prefect server, there is no auth. And of course!