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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)
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