#!/usr/bin/env python3
# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from logging import Logger
from typing import Any, Callable, List, TypeVar
from ax.storage.sqa_store.db import SQABase
from ax.storage.sqa_store.reduced_state import GR_LARGE_MODEL_ATTRS
from ax.storage.sqa_store.sqa_classes import (
ONLY_ONE_FIELDS,
ONLY_ONE_METRIC_FIELDS,
SQAMetric,
SQAParameter,
SQAParameterConstraint,
SQARunner,
)
from ax.utils.common.logger import get_logger
from sqlalchemy import event
from sqlalchemy.engine import Connection
from sqlalchemy.orm.attributes import InstrumentedAttribute
from sqlalchemy.orm.base import NO_VALUE
from sqlalchemy.orm.mapper import Mapper
T = TypeVar("T")
logger: Logger = get_logger(__name__)
[docs]def listens_for_multiple(
targets: List[InstrumentedAttribute],
identifier: str,
*args: Any,
**kwargs: Any
# pyre-fixme[24]: Generic type `Callable` expects 2 type parameters.
) -> Callable:
"""Analogue of SQLAlchemy `listen_for`, but applies the same listening handler
function to multiple instrumented attributes.
"""
# pyre-fixme[3]: Return type must be annotated.
# pyre-fixme[24]: Generic type `Callable` expects 2 type parameters.
def wrapper(fn: Callable):
for target in targets:
event.listen(target, identifier, fn, *args, **kwargs)
return fn
return wrapper
# pyre-fixme[3]: Return annotation cannot be `Any`.
[docs]def consistency_exactly_one(instance: SQABase, exactly_one_fields: List[str]) -> Any:
"""Ensure that exactly one of `exactly_one_fields` has a value set."""
values = [getattr(instance, field) is not None for field in exactly_one_fields]
if sum(values) != 1:
raise ValueError(
f"{instance.__class__.__name__} must have exactly one of the following "
f"fields set: {', '.join(exactly_one_fields)}."
)
[docs]@listens_for_multiple(
targets=GR_LARGE_MODEL_ATTRS,
identifier="set",
# `retval=True` instruct the operation ('set' on attributes in `targets`) to use
# the return value of decorated function to set the attribute.
retval=True,
# `propagate=True` ensures that targets with subclasses of SQA classes used by
# default Ax OSS encoder inherit the event listeners.
propagate=True,
)
def do_not_set_existing_value_to_null(
instance: SQABase, new_value: T, old_value: T, initiator_event: event.Events
) -> T:
no_value = [None, NO_VALUE]
if new_value in no_value and old_value not in no_value:
logger.debug(
f"New value for attribute is `None` or has no value, but old value "
f"was set, so keeping the old value ({old_value})."
)
return old_value
return new_value
@event.listens_for(
SQAParameter,
"before_insert",
)
@event.listens_for(
SQAParameter,
"before_update",
)
# pyre-fixme[11]: Annotation `Mapper` is not defined as a type.
def validate_parameter(mapper: Mapper, connection: Connection, target: SQABase) -> None:
consistency_exactly_one(target, ONLY_ONE_FIELDS)
@event.listens_for(SQAParameterConstraint, "before_insert")
@event.listens_for(SQAParameterConstraint, "before_update")
def validate_parameter_constraint(
mapper: Mapper, connection: Connection, target: SQABase
) -> None:
consistency_exactly_one(target, ONLY_ONE_FIELDS)
@event.listens_for(SQAMetric, "before_insert")
@event.listens_for(SQAMetric, "before_update")
def validate_metric(mapper: Mapper, connection: Connection, target: SQABase) -> None:
consistency_exactly_one(target, ONLY_ONE_FIELDS + ONLY_ONE_METRIC_FIELDS)
@event.listens_for(SQARunner, "before_insert")
@event.listens_for(SQARunner, "before_update")
def validate_runner(mapper: Mapper, connection: Connection, target: SQABase) -> None:
consistency_exactly_one(target, ["experiment_id", "trial_id"])
