feast/sdk/python/feast/proto_json.py at pytorch-template · feast-dev/feast · GitHub

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import uuid

from importlib.metadata import version as importlib_version

from typing import Any, Callable, Type

from google.protobuf.json_format import ( # type: ignore

_WKTJSONMETHODS,

ParseError,

_Parser,

_Printer,

)

from packaging import version

from feast.protos.feast.serving.ServingService_pb2 import FeatureList

from feast.protos.feast.types.Value_pb2 import RepeatedValue, Value

ProtoMessage = Any

JsonObject = Any

def _patch_proto_json_encoding(

proto_type: Type[ProtoMessage],

to_json_object: Callable[[_Printer, ProtoMessage], JsonObject],

from_json_object: Callable[[_Parser, JsonObject, ProtoMessage], None],

) -> None:

"""Patch Protobuf JSON Encoder / Decoder for a desired Protobuf type with to_json & from_json methods."""

to_json_fn_name = "_" + uuid.uuid4().hex

from_json_fn_name = "_" + uuid.uuid4().hex

setattr(_Printer, to_json_fn_name, to_json_object)

setattr(_Parser, from_json_fn_name, from_json_object)

_WKTJSONMETHODS[proto_type.DESCRIPTOR.full_name] = [

to_json_fn_name,

from_json_fn_name,

]

def _patch_feast_value_json_encoding():

"""Patch Protobuf JSON Encoder / Decoder with a Feast Value type.

This allows encoding the proto object as a native type, without the dummy structural wrapper.

Here's a before example:

{

"value_1": {

"int64_val": 1

"value_2": {

"double_list_val": [1.0, 2.0, 3.0]

}

And here's an after example:

{

"value_1": 1,

"value_2": [1.0, 2.0, 3.0]

}

"""

def to_json_object(printer: _Printer, message: ProtoMessage) -> JsonObject:

which = message.WhichOneof("val")

# If the Value message is not set treat as null_value when serialize

# to JSON. The parse back result will be different from original message.

if which is None or which == "null_val":

return None

elif "_list_" in which:

value = list(getattr(message, which).val)

else:

value = getattr(message, which)

return value

def from_json_object(

parser: _Parser, value: JsonObject, message: ProtoMessage

) -> None:

if value is None:

message.null_val = 0

elif isinstance(value, bool):

message.bool_val = value

elif isinstance(value, str):

message.string_val = value

elif isinstance(value, int):

message.int64_val = value

elif isinstance(value, float):

message.double_val = value

elif isinstance(value, list):

if len(value) == 0:

# Clear will mark the struct as modified so it will be created even if there are no values

message.int64_list_val.Clear()

elif isinstance(value[0], bool):

message.bool_list_val.val.extend(value)

elif isinstance(value[0], str):

message.string_list_val.val.extend(value)

elif isinstance(value[0], (float, int, type(None))):

# Identify array as ints if all of the elements are ints

if all(isinstance(item, int) for item in value):

message.int64_list_val.val.extend(value)

# If any of the elements are floats or nulls, then parse it as a float array

else:

# Convert each null as NaN.

message.double_list_val.val.extend(

[item if item is not None else float("nan") for item in value]

)

else:

raise ParseError(

"Value {0} has unexpected type {1}.".format(

value[0], type(value[0])

)

else:

raise ParseError(

"Value {0} has unexpected type {1}.".format(value, type(value))

)

def from_json_object_updated(

parser: _Parser, value: JsonObject, message: ProtoMessage, path: str

from_json_object(parser, value, message)

# https://github.com/feast-dev/feast/issues/2484 Certain feast users need a higher version of protobuf but the

# parameters of `from_json_object` changes in feast 3.20.1. This change gives users flexibility to use earlier versions.

current_version = importlib_version("protobuf")

if version.parse(current_version) < version.parse("3.20"):

_patch_proto_json_encoding(Value, to_json_object, from_json_object)

else:

_patch_proto_json_encoding(Value, to_json_object, from_json_object_updated)

def _patch_feast_repeated_value_json_encoding():

"""Patch Protobuf JSON Encoder / Decoder with a Feast RepeatedValue type.

This allows list of lists without dummy field name "val".

Here's a before example:

{

"repeated_value": [

{"val": [1,2,3]},

{"val": [4,5,6]}

]

}

And here's an after example:

{

"repeated_value": [

[1,2,3],

[4,5,6]

]

}

"""

def to_json_object(printer: _Printer, message: ProtoMessage) -> JsonObject:

return [printer._MessageToJsonObject(item) for item in message.val]

def from_json_object_updated(

parser: _Parser, value: JsonObject, message: ProtoMessage, path: str

) -> None:

array = value if isinstance(value, list) else value["val"]

for item in array:

parser.ConvertMessage(item, message.val.add(), path)

def from_json_object(

parser: _Parser, value: JsonObject, message: ProtoMessage

) -> None:

array = value if isinstance(value, list) else value["val"]

for item in array:

parser.ConvertMessage(item, message.val.add())

# https://github.com/feast-dev/feast/issues/2484 Certain feast users need a higher version of protobuf but the

# parameters of `from_json_object` changes in feast 3.20.1. This change gives users flexibility to use earlier versions.

current_version = importlib_version("protobuf")

if version.parse(current_version) < version.parse("3.20"):

_patch_proto_json_encoding(RepeatedValue, to_json_object, from_json_object)

else:

_patch_proto_json_encoding(

RepeatedValue, to_json_object, from_json_object_updated

)

def _patch_feast_feature_list_json_encoding():

"""Patch Protobuf JSON Encoder / Decoder with a Feast FeatureList type.

This allows list of lists without dummy field name "features".

Here's a before example:

{

"feature_list": {

"features": [

"feature-1",

"feature-2",

"feature-3"

]

}

And here's an after example:

{

"feature_list": [

"feature-1",

"feature-2",

"feature-3"

]

}

"""

def to_json_object(printer: _Printer, message: ProtoMessage) -> JsonObject:

return list(message.val)

def from_json_object(

parser: _Parser, value: JsonObject, message: ProtoMessage

) -> None:

array = value if isinstance(value, list) else value["val"]

message.val.extend(array)

def from_json_object_updated(

parser: _Parser, value: JsonObject, message: ProtoMessage, path: str

) -> None:

from_json_object(parser, value, message)

# https://github.com/feast-dev/feast/issues/2484 Certain feast users need a higher version of protobuf but the

# parameters of `from_json_object` changes in feast 3.20.1. This change gives users flexibility to use earlier versions.

current_version = importlib_version("protobuf")

if version.parse(current_version) < version.parse("3.20"):

_patch_proto_json_encoding(FeatureList, to_json_object, from_json_object)

else:

_patch_proto_json_encoding(

FeatureList, to_json_object, from_json_object_updated

)

def patch():

"""Patch Protobuf JSON Encoder / Decoder with all desired Feast types."""

_patch_feast_value_json_encoding()

_patch_feast_repeated_value_json_encoding()

_patch_feast_feature_list_json_encoding()

feast/sdk/python/feast/proto_json.py at pytorch-template · feast-dev/feast · GitHub

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