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# Copyright 2019 The gRPC 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
#
#     http://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.

from __future__ import annotations

from typing import Optional

import grpc
from grpc._cython import cygrpc
from grpc._typing import MetadataType

NoCompression = cygrpc.CompressionAlgorithm.none
Deflate = cygrpc.CompressionAlgorithm.deflate
Gzip = cygrpc.CompressionAlgorithm.gzip

_METADATA_STRING_MAPPING = {
    NoCompression: 'identity',
    Deflate: 'deflate',
    Gzip: 'gzip',
}


def _compression_algorithm_to_metadata_value(
        compression: grpc.Compression) -> str:
    return _METADATA_STRING_MAPPING[compression]


def compression_algorithm_to_metadata(compression: grpc.Compression):
    return (cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY,
            _compression_algorithm_to_metadata_value(compression))


def create_channel_option(compression: Optional[grpc.Compression]):
    return ((cygrpc.GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM,
             int(compression)),) if compression else ()


def augment_metadata(metadata: Optional[MetadataType],
                     compression: Optional[grpc.Compression]):
    if not metadata and not compression:
        return None
    base_metadata = tuple(metadata) if metadata else ()
    compression_metadata = (
        compression_algorithm_to_metadata(compression),) if compression else ()
    return base_metadata + compression_metadata


__all__ = (
    "NoCompression",
    "Deflate",
    "Gzip",
)

	# Copyright 2019 The gRPC 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
	#
	# http://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.

	from __future__ import annotations

	from typing import Optional

	import grpc
	from grpc._cython import cygrpc
	from grpc._typing import MetadataType

	NoCompression = cygrpc.CompressionAlgorithm.none
	Deflate = cygrpc.CompressionAlgorithm.deflate
	Gzip = cygrpc.CompressionAlgorithm.gzip

	_METADATA_STRING_MAPPING = {
	NoCompression: 'identity',
	Deflate: 'deflate',
	Gzip: 'gzip',
	}


	def _compression_algorithm_to_metadata_value(
	compression: grpc.Compression) -> str:
	return _METADATA_STRING_MAPPING[compression]


	def compression_algorithm_to_metadata(compression: grpc.Compression):
	return (cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY,
	_compression_algorithm_to_metadata_value(compression))


	def create_channel_option(compression: Optional[grpc.Compression]):
	return ((cygrpc.GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM,
	int(compression)),) if compression else ()


	def augment_metadata(metadata: Optional[MetadataType],
	compression: Optional[grpc.Compression]):
	if not metadata and not compression:
	return None
	base_metadata = tuple(metadata) if metadata else ()
	compression_metadata = (
	compression_algorithm_to_metadata(compression),) if compression else ()
	return base_metadata + compression_metadata


	__all__ = (
	"NoCompression",
	"Deflate",
	"Gzip",
	)