@Marvin In automation, spefically discord notification, can I somehow access states of sub-flows triggered by my main flow? I would like to report statuses of all subflows in my discord notification.

To access the states of sub-flows triggered by your main flow in Prefect 3.x, you can utilize the Prefect client to monitor and retrieve the state of each sub-flow run. Here's a concise approach: 1. Create Sub-flow Runs: When you create a sub-flow run, you can store its metadata, including its run ID, which will be useful for tracking its state later. 2. Monitor Sub-flow States: Use the

get_client

function from Prefect to interact with the Prefect API and retrieve the state of each sub-flow run using their run IDs. 3. Send Notifications: Once you have the state information, you can format and send it as a Discord notification. Here's a rough outline of how you might implement this:

python
from prefect import flow, get_client

@flow
def main_flow():
    # Assume subflow_run_ids is a list of sub-flow run IDs
    subflow_run_ids = [...]  # Populate this with actual sub-flow run IDs

    client = get_client()
    subflow_states = []
    
    for run_id in subflow_run_ids:
        flow_run = client.get_flow_run(run_id)
        subflow_states.append((flow_run.name, flow_run.state.name))
    
    # Format the states for Discord notification
    message = "\n".join([f"Sub-flow {name}: {state}" for name, state in subflow_states])
    send_discord_notification(message)

def send_discord_notification(message):
    # Implement your Discord notification logic here
    pass

For more detailed information, you can refer to the Prefect documentation on managing states and using hooks for notifications here. Additionally, the Prefect API provides useful functions like

get_client

,

flow

, and

State

which are essential for interacting with flow runs and their states. You can explore more about these in the Prefect API documentation. If you have any specific questions about the implementation or need further assistance, feel free to ask.