64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
# Copyright 2019 The gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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from typing import Optional
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import grpc
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from grpc._cython import cygrpc
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from grpc._typing import MetadataType
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NoCompression = cygrpc.CompressionAlgorithm.none
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Deflate = cygrpc.CompressionAlgorithm.deflate
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Gzip = cygrpc.CompressionAlgorithm.gzip
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_METADATA_STRING_MAPPING = {
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NoCompression: 'identity',
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Deflate: 'deflate',
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Gzip: 'gzip',
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}
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def _compression_algorithm_to_metadata_value(
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compression: grpc.Compression) -> str:
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return _METADATA_STRING_MAPPING[compression]
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def compression_algorithm_to_metadata(compression: grpc.Compression):
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return (cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY,
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_compression_algorithm_to_metadata_value(compression))
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def create_channel_option(compression: Optional[grpc.Compression]):
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return ((cygrpc.GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM,
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int(compression)),) if compression else ()
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def augment_metadata(metadata: Optional[MetadataType],
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compression: Optional[grpc.Compression]):
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if not metadata and not compression:
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return None
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base_metadata = tuple(metadata) if metadata else ()
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compression_metadata = (
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compression_algorithm_to_metadata(compression),) if compression else ()
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return base_metadata + compression_metadata
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__all__ = (
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"NoCompression",
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"Deflate",
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"Gzip",
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)
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