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entity.py
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178 lines (151 loc) · 6.09 KB
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# Copyright 2019 The Feast Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import warnings
from datetime import datetime
from typing import Dict, Optional
from google.protobuf.json_format import MessageToJson
from feast.protos.feast.core.Entity_pb2 import Entity as EntityProto
from feast.protos.feast.core.Entity_pb2 import EntityMeta as EntityMetaProto
from feast.protos.feast.core.Entity_pb2 import EntitySpecV2 as EntitySpecProto
from feast.usage import log_exceptions
from feast.value_type import ValueType
class Entity:
"""
An entity defines a collection of entities for which features can be defined. An
entity can also contain associated metadata.
Attributes:
name: The unique name of the entity.
value_type: The type of the entity, such as string or float.
join_key: A property that uniquely identifies different entities within the
collection. The join_key property is typically used for joining entities
with their associated features. If not specified, defaults to the name.
description: A human-readable description.
tags: A dictionary of key-value pairs to store arbitrary metadata.
owner: The owner of the entity, typically the email of the primary maintainer.
created_timestamp: The time when the entity was created.
last_updated_timestamp: The time when the entity was last updated.
"""
name: str
value_type: ValueType
join_key: str
description: str
tags: Dict[str, str]
owner: str
created_timestamp: Optional[datetime]
last_updated_timestamp: Optional[datetime]
@log_exceptions
def __init__(
self,
*args,
name: Optional[str] = None,
value_type: ValueType = ValueType.UNKNOWN,
description: str = "",
join_key: Optional[str] = None,
tags: Optional[Dict[str, str]] = None,
owner: str = "",
):
"""Creates an Entity object."""
if len(args) == 1:
warnings.warn(
(
"Entity name should be specified as a keyword argument instead of a positional arg."
"Feast 0.23+ will not support positional arguments to construct Entities"
),
DeprecationWarning,
)
if len(args) > 1:
raise ValueError(
"All arguments to construct an entity should be specified as keyword arguments only"
)
self.name = args[0] if len(args) > 0 else name
if not self.name:
raise ValueError("Name needs to be specified")
self.value_type = value_type
self.join_key = join_key if join_key else self.name
self.description = description
self.tags = tags if tags is not None else {}
self.owner = owner
self.created_timestamp = None
self.last_updated_timestamp = None
def __hash__(self) -> int:
return hash((id(self), self.name))
def __eq__(self, other):
if not isinstance(other, Entity):
raise TypeError("Comparisons should only involve Entity class objects.")
if (
self.name != other.name
or self.value_type != other.value_type
or self.join_key != other.join_key
or self.description != other.description
or self.tags != other.tags
or self.owner != other.owner
):
return False
return True
def __str__(self):
return str(MessageToJson(self.to_proto()))
def is_valid(self):
"""
Validates the state of this entity locally.
Raises:
ValueError: The entity does not have a name or does not have a type.
"""
if not self.name:
raise ValueError("The entity does not have a name.")
if not self.value_type:
raise ValueError(f"The entity {self.name} does not have a type.")
@classmethod
def from_proto(cls, entity_proto: EntityProto):
"""
Creates an entity from a protobuf representation of an entity.
Args:
entity_proto: A protobuf representation of an entity.
Returns:
An Entity object based on the entity protobuf.
"""
entity = cls(
name=entity_proto.spec.name,
value_type=ValueType(entity_proto.spec.value_type),
join_key=entity_proto.spec.join_key,
description=entity_proto.spec.description,
tags=entity_proto.spec.tags,
owner=entity_proto.spec.owner,
)
if entity_proto.meta.HasField("created_timestamp"):
entity.created_timestamp = entity_proto.meta.created_timestamp.ToDatetime()
if entity_proto.meta.HasField("last_updated_timestamp"):
entity.last_updated_timestamp = (
entity_proto.meta.last_updated_timestamp.ToDatetime()
)
return entity
def to_proto(self) -> EntityProto:
"""
Converts an entity object to its protobuf representation.
Returns:
An EntityProto protobuf.
"""
meta = EntityMetaProto()
if self.created_timestamp:
meta.created_timestamp.FromDatetime(self.created_timestamp)
if self.last_updated_timestamp:
meta.last_updated_timestamp.FromDatetime(self.last_updated_timestamp)
spec = EntitySpecProto(
name=self.name,
value_type=self.value_type.value,
join_key=self.join_key,
description=self.description,
tags=self.tags,
owner=self.owner,
)
return EntityProto(spec=spec, meta=meta)