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