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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.
"""Interceptor that adds headers to outgoing requests."""
import collections
import grpc
import generic_client_interceptor
class _ClientCallDetails(
collections.namedtuple('_ClientCallDetails',
('method', 'timeout', 'metadata',
'credentials')), grpc.ClientCallDetails):
pass
def header_adder_interceptor(header, value):
def intercept_call(client_call_details, request_iterator, request_streaming,
response_streaming):
metadata = []
if client_call_details.metadata is not None:
metadata = list(client_call_details.metadata)
metadata.append((header, value,))
client_call_details = _ClientCallDetails(
client_call_details.method, client_call_details.timeout, metadata,
client_call_details.credentials)
return client_call_details, request_iterator, None
return generic_client_interceptor.create(intercept_call)
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