53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
# 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)
|