prefect.orion.models.flow_runs

Functions for interacting with flow run ORM objects. Intended for internal use by the Orion API.

count_flow_runs async

Count flow runs.

Parameters:

Name	Description	Default
session	a database session AsyncSession	required
flow_filter	only count flow runs whose flows match these filters FlowFilter	None
flow_run_filter	only count flow runs that match these filters FlowRunFilter	None
task_run_filter	only count flow runs whose task runs match these filters TaskRunFilter	None
deployment_filter	only count flow runs whose deployments match these filters DeploymentFilter	None

Returns:

Type	Description
int	count of flow runs

Source code in prefect/orion/models/flow_runs.py

@inject_db
async def count_flow_runs(
    session: AsyncSession,
    db: OrionDBInterface,
    flow_filter: schemas.filters.FlowFilter = None,
    flow_run_filter: schemas.filters.FlowRunFilter = None,
    task_run_filter: schemas.filters.TaskRunFilter = None,
    deployment_filter: schemas.filters.DeploymentFilter = None,
) -> int:
    """
    Count flow runs.

    Args:
        session: a database session
        flow_filter: only count flow runs whose flows match these filters
        flow_run_filter: only count flow runs that match these filters
        task_run_filter: only count flow runs whose task runs match these filters
        deployment_filter: only count flow runs whose deployments match these filters

    Returns:
        int: count of flow runs
    """

    query = select(sa.func.count(sa.text("*"))).select_from(db.FlowRun)

    query = await _apply_flow_run_filters(
        query,
        flow_filter=flow_filter,
        flow_run_filter=flow_run_filter,
        task_run_filter=task_run_filter,
        deployment_filter=deployment_filter,
        db=db,
    )

    result = await session.execute(query)
    return result.scalar()

create_flow_run async

Creates a new flow run.

If the provided flow run has a state attached, it will also be created.

Parameters:

Name	Description	Default
session	a database session AsyncSession	required
flow_run	a flow run model FlowRun	required

Returns:

Type	Description
db.FlowRun	the newly-created flow run

Source code in prefect/orion/models/flow_runs.py

@inject_db
async def create_flow_run(
    session: AsyncSession, flow_run: schemas.core.FlowRun, db: OrionDBInterface
):
    """Creates a new flow run.

    If the provided flow run has a state attached, it will also be created.

    Args:
        session: a database session
        flow_run: a flow run model

    Returns:
        db.FlowRun: the newly-created flow run
    """
    now = pendulum.now("UTC")

    flow_run_dict = dict(
        **flow_run.dict(
            shallow=True,
            exclude={
                "created",
                "state",
                "estimated_run_time",
                "estimated_start_time_delta",
            },
            exclude_unset=True,
        ),
        created=now,
    )

    # if no idempotency key was provided, create the run directly
    if not flow_run.idempotency_key:
        model = db.FlowRun(**flow_run_dict)
        session.add(model)
        await session.flush()

    # otherwise let the database take care of enforcing idempotency
    else:
        insert_stmt = (
            (await db.insert(db.FlowRun))
            .values(**flow_run_dict)
            .on_conflict_do_nothing(
                index_elements=db.flow_run_unique_upsert_columns,
            )
        )
        await session.execute(insert_stmt)

        # read the run to see if idempotency was applied or not
        query = (
            sa.select(db.FlowRun)
            .where(
                sa.and_(
                    db.FlowRun.flow_id == flow_run.flow_id,
                    db.FlowRun.idempotency_key == flow_run.idempotency_key,
                )
            )
            .limit(1)
            .execution_options(populate_existing=True)
        )
        result = await session.execute(query)
        model = result.scalar()

    # if the flow run was created in this function call then we need to set the
    # state. If it was created idempotently, the created time won't match.
    if model.created == now and flow_run.state:
        await models.flow_runs.set_flow_run_state(
            session=session,
            flow_run_id=model.id,
            state=flow_run.state,
            force=True,
        )
    return model

delete_flow_run async

Delete a flow run by flow_run_id.

Parameters:

Name	Description	Default
session	A database session AsyncSession	required
flow_run_id	a flow run id UUID	required

Returns:

Type	Description
bool	whether or not the flow run was deleted

Source code in prefect/orion/models/flow_runs.py

@inject_db
async def delete_flow_run(
    session: AsyncSession, flow_run_id: UUID, db: OrionDBInterface
) -> bool:
    """
    Delete a flow run by flow_run_id.

    Args:
        session: A database session
        flow_run_id: a flow run id

    Returns:
        bool: whether or not the flow run was deleted
    """

    result = await session.execute(
        delete(db.FlowRun).where(db.FlowRun.id == flow_run_id)
    )
    return result.rowcount > 0

read_flow_run async

Reads a flow run by id.

Parameters:

Name	Description	Default
session	A database session AsyncSession	required
flow_run_id	a flow run id UUID	required

Returns:

Type	Description
db.FlowRun	the flow run

Source code in prefect/orion/models/flow_runs.py

@inject_db
async def read_flow_run(session: AsyncSession, flow_run_id: UUID, db: OrionDBInterface):
    """
    Reads a flow run by id.

    Args:
        session: A database session
        flow_run_id: a flow run id

    Returns:
        db.FlowRun: the flow run
    """

    return await session.get(db.FlowRun, flow_run_id)

read_flow_runs async

Read flow runs.

Parameters:

Name	Description	Default
session	a database session AsyncSession	required
columns	a list of the flow run ORM columns to load, for performance List	None
flow_filter	only select flow runs whose flows match these filters FlowFilter	None
flow_run_filter	only select flow runs match these filters FlowRunFilter	None
task_run_filter	only select flow runs whose task runs match these filters TaskRunFilter	None
deployment_filter	only sleect flow runs whose deployments match these filters DeploymentFilter	None
offset	Query offset int	None
limit	Query limit int	None
sort	Query sort FlowRunSort	FlowRunSort.ID_DESC

Returns:

Type	Description
List[db.FlowRun]	flow runs

Source code in prefect/orion/models/flow_runs.py

@inject_db
async def read_flow_runs(
    session: AsyncSession,
    db: OrionDBInterface,
    columns: List = None,
    flow_filter: schemas.filters.FlowFilter = None,
    flow_run_filter: schemas.filters.FlowRunFilter = None,
    task_run_filter: schemas.filters.TaskRunFilter = None,
    deployment_filter: schemas.filters.DeploymentFilter = None,
    offset: int = None,
    limit: int = None,
    sort: schemas.sorting.FlowRunSort = schemas.sorting.FlowRunSort.ID_DESC,
):
    """
    Read flow runs.

    Args:
        session: a database session
        columns: a list of the flow run ORM columns to load, for performance
        flow_filter: only select flow runs whose flows match these filters
        flow_run_filter: only select flow runs match these filters
        task_run_filter: only select flow runs whose task runs match these filters
        deployment_filter: only sleect flow runs whose deployments match these filters
        offset: Query offset
        limit: Query limit
        sort: Query sort

    Returns:
        List[db.FlowRun]: flow runs
    """
    query = select(db.FlowRun).order_by(sort.as_sql_sort(db))

    if columns:
        query = query.options(load_only(*columns))

    query = await _apply_flow_run_filters(
        query,
        flow_filter=flow_filter,
        flow_run_filter=flow_run_filter,
        task_run_filter=task_run_filter,
        deployment_filter=deployment_filter,
        db=db,
    )

    if offset is not None:
        query = query.offset(offset)

    if limit is not None:
        query = query.limit(limit)

    result = await session.execute(query)
    return result.scalars().unique().all()

read_task_run_dependencies async

Get a task run dependency map for a given flow run.

Source code in prefect/orion/models/flow_runs.py

async def read_task_run_dependencies(
    session: AsyncSession,
    flow_run_id: UUID,
) -> List[DependencyResult]:
    """
    Get a task run dependency map for a given flow run.
    """
    flow_run = await models.flow_runs.read_flow_run(
        session=session, flow_run_id=flow_run_id
    )
    if not flow_run:
        raise ObjectNotFoundError(f"Flow run with id {flow_run_id} not found")

    task_runs = await models.task_runs.read_task_runs(
        session=session,
        flow_run_filter=schemas.filters.FlowRunFilter(
            id=schemas.filters.FlowRunFilterId(any_=[flow_run_id])
        ),
    )

    dependency_graph = []

    for task_run in task_runs:
        inputs = list(set(chain(*task_run.task_inputs.values())))
        dependency_graph.append(
            {
                "id": task_run.id,
                "upstream_dependencies": inputs,
                "state": task_run.state,
                "expected_start_time": task_run.expected_start_time,
                "start_time": task_run.start_time,
                "end_time": task_run.end_time,
                "total_run_time": task_run.total_run_time,
                "estimated_run_time": task_run.estimated_run_time,
            }
        )

    return dependency_graph

set_flow_run_state async

Creates a new orchestrated flow run state.

Setting a new state on a run is the one of the principal actions that is governed by Orion's orchestration logic. Setting a new run state will not guarantee creation, but instead trigger orchestration rules to govern the proposed state input. If the state is considered valid, it will be written to the database. Otherwise, a it's possible a different state, or no state, will be created. A force flag is supplied to bypass a subset of orchestration logic.

Parameters:

Name	Description	Default
session	a database session AsyncSession	required
flow_run_id	the flow run id UUID	required
state	a flow run state model State	required
force	if False, orchestration rules will be applied that may alter or prevent the state transition. If True, orchestration rules are not applied. bool	False

Returns:

Type	Description
OrchestrationResult	OrchestrationResult object

Source code in prefect/orion/models/flow_runs.py

async def set_flow_run_state(
    session: AsyncSession,
    flow_run_id: UUID,
    state: schemas.states.State,
    force: bool = False,
    flow_policy: BaseOrchestrationPolicy = None,
) -> OrchestrationResult:
    """
    Creates a new orchestrated flow run state.

    Setting a new state on a run is the one of the principal actions that is governed by
    Orion's orchestration logic. Setting a new run state will not guarantee creation,
    but instead trigger orchestration rules to govern the proposed `state` input. If
    the state is considered valid, it will be written to the database. Otherwise, a
    it's possible a different state, or no state, will be created. A `force` flag is
    supplied to bypass a subset of orchestration logic.

    Args:
        session: a database session
        flow_run_id: the flow run id
        state: a flow run state model
        force: if False, orchestration rules will be applied that may alter or prevent
            the state transition. If True, orchestration rules are not applied.

    Returns:
        OrchestrationResult object
    """

    # load the flow run
    run = await models.flow_runs.read_flow_run(
        session=session,
        flow_run_id=flow_run_id,
    )

    if not run:
        raise ObjectNotFoundError(f"Flow run with id {flow_run_id} not found")

    initial_state = run.state.as_state() if run.state else None
    initial_state_type = initial_state.type if initial_state else None
    proposed_state_type = state.type if state else None
    intended_transition = (initial_state_type, proposed_state_type)

    if force or flow_policy is None:
        flow_policy = MinimalFlowPolicy

    orchestration_rules = flow_policy.compile_transition_rules(*intended_transition)
    global_rules = GlobalFlowPolicy.compile_transition_rules(*intended_transition)

    context = FlowOrchestrationContext(
        session=session,
        run=run,
        initial_state=initial_state,
        proposed_state=state,
    )

    # apply orchestration rules and create the new flow run state
    async with contextlib.AsyncExitStack() as stack:
        for rule in orchestration_rules:
            context = await stack.enter_async_context(
                rule(context, *intended_transition)
            )

        for rule in global_rules:
            context = await stack.enter_async_context(rule(context))

        await context.validate_proposed_state()

    await session.flush()

    result = OrchestrationResult(
        state=context.validated_state,
        status=context.response_status,
        details=context.response_details,
    )

    # if a new state is being set (either ACCEPTED from user or REJECTED
    # and set by the server), check for any notification policies
    if result.status in (SetStateStatus.ACCEPT, SetStateStatus.REJECT):
        await models.flow_run_notification_policies.queue_flow_run_notifications(
            session=session, flow_run=run
        )

    return result

update_flow_run async

Updates a flow run.

Parameters:

Name	Description	Default
session	a database session AsyncSession	required
flow_run_id	the flow run id to update UUID	required
flow_run	a flow run model FlowRunUpdate	required

Returns:

Type	Description
bool	whether or not matching rows were found to update

Source code in prefect/orion/models/flow_runs.py

@inject_db
async def update_flow_run(
    session: AsyncSession,
    flow_run_id: UUID,
    flow_run: schemas.actions.FlowRunUpdate,
    db: OrionDBInterface,
) -> bool:
    """
    Updates a flow run.

    Args:
        session: a database session
        flow_run_id: the flow run id to update
        flow_run: a flow run model

    Returns:
        bool: whether or not matching rows were found to update
    """

    if not isinstance(flow_run, schemas.actions.FlowRunUpdate):
        raise ValueError(
            f"Expected parameter flow_run to have type schemas.actions.FlowRunUpdate, got {type(flow_run)!r} instead"
        )

    update_stmt = (
        sa.update(db.FlowRun).where(db.FlowRun.id == flow_run_id)
        # exclude_unset=True allows us to only update values provided by
        # the user, ignoring any defaults on the model
        .values(**flow_run.dict(shallow=True, exclude_unset=True))
    )
    result = await session.execute(update_stmt)
    return result.rowcount > 0