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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 grpc
class _ConcreteValue(grpc.Future):
def __init__(self, result):
self._result = result
def cancel(self):
return False
def cancelled(self):
return False
def running(self):
return False
def done(self):
return True
def result(self, timeout=None):
return self._result
def exception(self, timeout=None):
return None
def traceback(self, timeout=None):
return None
def add_done_callback(self, fn):
fn(self._result)
class DefaultValueClientInterceptor(grpc.UnaryUnaryClientInterceptor,
grpc.StreamUnaryClientInterceptor):
def __init__(self, value):
self._default = _ConcreteValue(value)
def _intercept_call(self, continuation, client_call_details,
request_or_iterator):
response = continuation(client_call_details, request_or_iterator)
return self._default if response.exception() else response
def intercept_unary_unary(self, continuation, client_call_details, request):
return self._intercept_call(continuation, client_call_details, request)
def intercept_stream_unary(self, continuation, client_call_details,
request_iterator):
return self._intercept_call(continuation, client_call_details,
request_iterator)
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