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# Copyright 2020 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 aIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from
abc
import
ABC
,
abstractmethod
from
feast
.
protos
.
feast
.
core
.
DataFormat_pb2
import
FileFormat
as
FileFormatProto
from
feast
.
protos
.
feast
.
core
.
DataFormat_pb2
import
StreamFormat
as
StreamFormatProto
from
feast
.
protos
.
feast
.
core
.
DataFormat_pb2
import
TableFormat
as
TableFormatProto
class
FileFormat
(
ABC
):
"""
Defines an abtract file forma used to encode feature data in files
"""
@
abstractmethod
def
to_proto
(
self
):
"""
Convert this FileFormat into its protobuf representation.
"""
pass
def
__eq__
(
self
,
other
):
return
self
.
to_proto
()
==
other
.
to_proto
()
@
classmethod
def
from_proto
(
cls
,
proto
):
"""
Construct this FileFormat from its protobuf representation.
Raises NotImplementedError if FileFormat specified in given proto is not supported.
"""
fmt
=
proto
.
WhichOneof
(
"format"
)
if
fmt
==
"parquet_format"
:
return
ParquetFormat
()
elif
fmt
==
"delta_format"
:
return
DeltaFormat
()
if
fmt
is
None
:
return
None
raise
NotImplementedError
(
f"FileFormat is unsupported:
{
fmt
}
"
)
def
__str__
(
self
):
"""
String representation of the file format passed to spark
"""
raise
NotImplementedError
()
class
ParquetFormat
(
FileFormat
):
"""
Defines the Parquet data format
"""
def
to_proto
(
self
):
return
FileFormatProto
(
parquet_format
=
FileFormatProto
.
ParquetFormat
())
def
__str__
(
self
):
return
"parquet"
class
DeltaFormat
(
FileFormat
):
"""
Defines delta data format (deprecated - use TableFormat.DeltaFormat instead)
"""
def
to_proto
(
self
):
# Reference TableFormat.DeltaFormat since DeltaFormat is now nested there
return
FileFormatProto
(
delta_format
=
TableFormatProto
.
DeltaFormat
())
def
__str__
(
self
):
return
"delta"
class
StreamFormat
(
ABC
):
"""
Defines an abtracts streaming data format used to encode feature data in streams
"""
@
abstractmethod
def
to_proto
(
self
):
"""
Convert this StreamFormat into its protobuf representation.
"""
pass
def
__eq__
(
self
,
other
):
return
self
.
to_proto
()
==
other
.
to_proto
()
@
classmethod
def
from_proto
(
cls
,
proto
):
"""
Construct this StreamFormat from its protobuf representation.
"""
fmt
=
proto
.
WhichOneof
(
"format"
)
if
fmt
==
"avro_format"
:
return
AvroFormat
(
schema_json
=
proto
.
avro_format
.
schema_json
)
if
fmt
==
"json_format"
:
return
JsonFormat
(
schema_json
=
proto
.
json_format
.
schema_json
)
if
fmt
==
"proto_format"
:
return
ProtoFormat
(
class_path
=
proto
.
proto_format
.
class_path
)
raise
NotImplementedError
(
f"StreamFormat is unsupported:
{
fmt
}
"
)
class
AvroFormat
(
StreamFormat
):
"""
Defines the Avro streaming data format that encodes data in Avro format
"""
def
__init__
(
self
,
schema_json
:
str
):
"""
Construct a new Avro data format.
Args:
schema_json: Avro schema definition in JSON
"""
self
.
schema_json
=
schema_json
def
to_proto
(
self
):
proto
=
StreamFormatProto
.
AvroFormat
(
schema_json
=
self
.
schema_json
)
return
StreamFormatProto
(
avro_format
=
proto
)
class
JsonFormat
(
StreamFormat
):
"""
Defines the Json streaming data format that encodes data in Json format
"""
def
__init__
(
self
,
schema_json
:
str
):
"""
Construct a new Json data format.
For spark, uses pyspark ddl string format. Example shown here:
https://vincent.doba.fr/posts/20211004_spark_data_description_language_for_defining_spark_schema/
Args:
schema_json: Json schema definition
"""
self
.
schema_json
=
schema_json
def
to_proto
(
self
):
proto
=
StreamFormatProto
.
JsonFormat
(
schema_json
=
self
.
schema_json
)
return
StreamFormatProto
(
json_format
=
proto
)
class
ProtoFormat
(
StreamFormat
):
"""
Defines the Protobuf data format
"""
def
__init__
(
self
,
class_path
:
str
):
"""
Construct a new Protobuf data format.
Args:
class_path: Class path to the Java Protobuf class that can be used to decode protobuf messages.;
"""
self
.
class_path
=
class_path
def
to_proto
(
self
):
return
StreamFormatProto
(
proto_format
=
StreamFormatProto
.
ProtoFormat
(
class_path
=
self
.
class_path
)
)
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