Hi! I'd like to rename a flow run at run time with dynamic parameters. I know the

flow_run_name

parameter of the

@flow

annotation/function. But this I cannot use because when I write a function that generates a flow run I cannot access the run context via

get_run_context()

(this method is somehow blocking indefinitely, instead of giving me a flow context or throwing an exception!). But I need the run context to extract the parameters and modify it when I use the

flow_run_name

with a callable. I know that I can create a string template

flow_run_name='flow {parametername}'

but that's not enough because we have optional parameters. When the flow run parameter

parametername

is empty/None we generate a time specific default parameter (like "last hour" or "last day"). This way we generate batch jobs that could either run scheduled and always process the "default" data or get an explicit parameter for reprocessing. Therefore I'd like to a) access the given flow run parameters, b) modify it or set it to sensible defaults and then c) modify the flow run's name to something like

flow-name {modified_parameter}

-- https://github.com/PrefectHQ/prefect/issues/7463 seems not to help in my case. pseudo code:

@flow
def export(day_param: Optional[str] = None):
    day: datetime.date = parse_date(day_param) or datetime.date.today()
    set_current_flow_run_name( name = f'{FLOW_RUN} for {day}' ) # <-- this I need for day not day_param!

Is this possible? I'm using Prefect 2.12 at the moment. This is blocking

def get_name() -> str:
    ctx = get_run_context()
    day: datetime.date = parse_date(ctx.flow_run.parameters.get("day_param", None)) or datetime.date.today() # <-- not working
    return day

@flow(flow_run_name=get_name)
def export(day_param: Optional[str] = None):
    …