@Marvin, how can I have a flow run a task that cancels another flow?

You can cancel a flow run in Prefect 3.x using the

cancel

function from the

prefect.flow_run

module. Here's how you can implement a task that cancels another flow: 1. Import the necessary Prefect components. 2. Create a task that calls the

cancel

function with the appropriate flow run ID. Here's a basic example:

python
from prefect import flow, task, get_client
from prefect.client.orchestration import PrefectClient

@task
async def cancel_flow(flow_run_id: str):
    async with get_client() as client:
        await client.cancel_flow_run(flow_run_id)

@flow
async def control_flow():
    # Replace with the actual flow run ID you wish to cancel
    flow_run_id = "your-flow-run-id"
    await cancel_flow(flow_run_id)

if __name__ == "__main__":
    control_flow()

This example assumes you have the flow run ID of the flow you wish to cancel. The

cancel_flow

task uses the Prefect client to cancel the specified flow run. For more details, you can refer to the documentation: Prefect 3.x Cancel Flow Run

@Marvin, how can I have a flow run a task that cancels another flow in prefect 2.x?

In Prefect 2.x, you can cancel a flow run using the Prefect client. Here's how you can create a task to cancel another flow run: 1. Import the necessary Prefect components. 2. Use a task to interact with the Prefect client and cancel the flow run. Here's an example:

python
from prefect import task, Flow
from prefect.client import Client

@task
def cancel_another_flow(flow_run_id: str):
    client = Client()
    client.cancel_flow_run(flow_run_id)

with Flow("Control Flow") as flow:
    # Replace with the actual flow run ID you wish to cancel
    flow_run_id = "your-flow-run-id"
    cancel_another_flow(flow_run_id)

if __name__ == "__main__":
    flow.run()

This example uses the

Client

from Prefect to cancel the specified flow run. You need to replace

"your-flow-run-id"

with the actual ID of the flow run you want to cancel. For more details on flow management, you can refer to the documentation: Prefect 2.x Flows

@Marvin, how can I find all the flows that have a specific flow run id in prefex 2.x?

In Prefect 2.x, to find flows associated with a specific flow run ID, you can use the Prefect client to query for flow runs and filter them based on the flow run ID. Here's how you can do it:

python
from prefect.client import Client

def find_flows_by_run_id(flow_run_id: str):
    client = Client()
    # Retrieve the flow run details
    flow_run = client.get_flow_run_info(flow_run_id)
    
    # Print the flow name associated with this flow run
    print(f"Flow Name: {flow_run.flow.name}")
    print(f"Flow Run ID: {flow_run.id}")

# Replace with the actual flow run ID you wish to query
flow_run_id = "your-flow-run-id"
find_flows_by_run_id(flow_run_id)

This script uses the

get_flow_run_info

method to retrieve details about a specific flow run, then extracts and prints the flow name associated with that run. Make sure to replace

"your-flow-run-id"

with the actual flow run ID you're interested in. For more detailed usage, you can refer to the documentation: Using the Prefect Client

@Marvin, how can I get all the current flows running in prefect 2.x?

To retrieve all the current flows running in Prefect 2.x, you can use the Prefect client to query for flow runs with the state "Running". Here's how you can do it:

python
from prefect.client import Client
from prefect.client.schemas.filters import FlowRunFilter
from prefect.client.schemas.objects import FlowRun
from prefect.client.schemas.sorting import FlowRunSort

def get_running_flows():
    client = Client()
    # Define a filter for flow runs in the "Running" state
    flow_run_filter = FlowRunFilter(state={"name": {"any_": ["Running"]}})
    # Retrieve running flow runs
    running_flow_runs = client.read_flow_runs(flow_run_filter)

    # Print details of the running flows
    for flow_run in running_flow_runs:
        print(f"Flow Name: {flow_run.flow.name}, Flow Run ID: {flow_run.id}")

get_running_flows()

This script uses the

read_flow_runs

method with a filter to get all flow runs currently in the "Running" state. It then prints the names and IDs of these flow runs. For more detailed usage, you can refer to the documentation: Using the Prefect Client

@Marvin, how can I get all the current flows running in prefect 2.x that have a specific name?

To get all current flows running in Prefect 2.x with a specific name, you can use the Prefect client to filter flow runs by both their state and name. Here's how you can achieve this:

python
from prefect.client import Client
from prefect.client.schemas.filters import FlowRunFilter, FlowFilter

def get_running_flows_by_name(flow_name: str):
    client = Client()
    # Define a filter for flow runs in the "Running" state and with the specified name
    flow_run_filter = FlowRunFilter(
        state={"name": {"any_": ["Running"]}},
        flow=FlowFilter(name={"any_": [flow_name]})
    )
    # Retrieve running flow runs with the specified name
    running_flow_runs = client.read_flow_runs(flow_run_filter)

    # Print details of the running flows with the specified name
    for flow_run in running_flow_runs:
        print(f"Flow Name: {flow_run.flow.name}, Flow Run ID: {flow_run.id}")

# Replace with the actual flow name you wish to query
flow_name = "your-flow-name"
get_running_flows_by_name(flow_name)

This script uses the

read_flow_runs

method with filters to get all flow runs that are currently running and have a specific name. Make sure to replace

"your-flow-name"

with the actual name of the flow you're interested in. For more detailed usage, you can refer to the documentation: Using the Prefect Client

@Marvin, how can I get all the current flows running in prefect 2.x that have a specific name and then cancel these flows?

To get all current flows running in Prefect 2.x with a specific name and then cancel them, you can use the Prefect client to filter the flow runs by both their state and name, and then set their state to "Cancelled". Here's how you can do it:

python
from prefect.client import Client
from prefect.client.schemas.filters import FlowRunFilter, FlowFilter

def cancel_running_flows_by_name(flow_name: str):
    client = Client()
    # Define a filter for flow runs in the "Running" state and with the specified name
    flow_run_filter = FlowRunFilter(
        state={"name": {"any_": ["Running"]}},
        flow=FlowFilter(name={"any_": [flow_name]})
    )
    # Retrieve running flow runs with the specified name
    running_flow_runs = client.read_flow_runs(flow_run_filter)

    # Cancel each running flow
    for flow_run in running_flow_runs:
        print(f"Cancelling flow run '{flow_run.name}' with ID '{flow_run.id}'")
        client.set_flow_run_state(flow_run.id, state="Cancelled", force=True)

# Replace with the actual flow name you wish to cancel
flow_name = "your-flow-name"
cancel_running_flows_by_name(flow_name)

This script filters for running flow runs with a specific name and then cancels each one by setting its state to "Cancelled". Make sure to replace

"your-flow-name"

with the actual name of the flows you want to cancel. For more detailed usage, you can refer to the documentation: Using the Prefect Client