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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.
import grpc
class _RequestIterator(object):
def __init__(self, rpc, handler):
self._rpc = rpc
self._handler = handler
def _next(self):
read = self._handler.take_request()
if read.requests_closed:
raise StopIteration()
elif read.terminated:
rpc_error = grpc.RpcError()
self._rpc.add_rpc_error(rpc_error)
raise rpc_error
else:
return read.request
def __iter__(self):
return self
def __next__(self):
return self._next()
def next(self):
return self._next()
def _unary_response(argument, implementation, rpc, servicer_context):
try:
response = implementation(argument, servicer_context)
except Exception as exception: # pylint: disable=broad-except
rpc.application_exception_abort(exception)
else:
rpc.unary_response_complete(response)
def _stream_response(argument, implementation, rpc, servicer_context):
try:
response_iterator = implementation(argument, servicer_context)
except Exception as exception: # pylint: disable=broad-except
rpc.application_exception_abort(exception)
else:
while True:
try:
response = next(response_iterator)
except StopIteration:
rpc.stream_response_complete()
break
except Exception as exception: # pylint: disable=broad-except
rpc.application_exception_abort(exception)
break
else:
rpc.stream_response(response)
def unary_unary(implementation, rpc, request, servicer_context):
_unary_response(request, implementation, rpc, servicer_context)
def unary_stream(implementation, rpc, request, servicer_context):
_stream_response(request, implementation, rpc, servicer_context)
def stream_unary(implementation, rpc, handler, servicer_context):
_unary_response(
_RequestIterator(rpc, handler), implementation, rpc, servicer_context)
def stream_stream(implementation, rpc, handler, servicer_context):
_stream_response(
_RequestIterator(rpc, handler), implementation, rpc, servicer_context)
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