Hi All, what is the best way to send email notification when flow is completed. Is it state handler?

@Milly gupta Yes. You can use flow state handler to send a notification. Prefect also gives you few default notifiers like

gmail_notifier

etc. which can be directly used as a

state_hanfler

argument in your flow definition. You can choose the type of state on which notification should be send. this can be done by passing State value to

only_states

argument in

gmail_notifier

See more about it here: https://docs.prefect.io/api/latest/utilities/notifications.html?#functions You can also write your own flow state handler as per your need (In case you need to add more business logic to your flow state handler) see this doc, which explains how to do so: https://docs.prefect.io/core/concepts/notifications.html#state-handlers

Yeah and what's the best way to get flow details in the state handler for e.g when it finished, flow id, flow url?

You can get the flow details from

prefect.context

and in case you need more detail by flow run wise, you can do an API call through graphql query

Thanks Abhishek. Can I access prefect context in state handler?

Yes you can. also as state handler takes 3 arguments • flow/task object • old state • new state you can get the data from these objects as well. here is an example of one of my flow state handler

Sure. I couldn't find end time for finished state.

gist: https://gist.github.com/abhishekmishragithub/719a8f3f8b137d8533585965e95296b6

Ah this is really helpful

see my comment in the gist, it has an implementation of calling graphql query

Abishek is right here that you do have context available in a state handler, but for the end time for the finished state, you might need to hit the GraphQL API in the state handler

Great thank you Abhishek.