53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
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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', (
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'key',
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'value',
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))
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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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