mirror of https://github.com/grpc/grpc.git
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# Copyright 2017 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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"""API metadata conversion utilities.""" |
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import collections |
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_Metadatum = collections.namedtuple('_Metadatum', ('key', 'value',)) |
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def _beta_metadatum(key, value): |
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beta_key = key if isinstance(key, (bytes,)) else key.encode('ascii') |
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beta_value = value if isinstance(value, (bytes,)) else value.encode('ascii') |
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return _Metadatum(beta_key, beta_value) |
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def _metadatum(beta_key, beta_value): |
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key = beta_key if isinstance(beta_key, (str,)) else beta_key.decode('utf8') |
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if isinstance(beta_value, (str,)) or key[-4:] == '-bin': |
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value = beta_value |
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else: |
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value = beta_value.decode('utf8') |
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return _Metadatum(key, value) |
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def beta(metadata): |
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if metadata is None: |
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return () |
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else: |
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return tuple(_beta_metadatum(key, value) for key, value in metadata) |
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def unbeta(beta_metadata): |
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if beta_metadata is None: |
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return () |
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else: |
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return tuple( |
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_metadatum(beta_key, beta_value) |
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for beta_key, beta_value in beta_metadata) |
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