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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.
"""Common interfaces and implementation."""
import abc
import collections
import six
def _fuss(tuplified_metadata):
return tuplified_metadata + (
(
'grpc.metadata_added_by_runtime',
'gRPC is allowed to add metadata in transmission and does so.',
),
)
FUSSED_EMPTY_METADATA = _fuss(())
def fuss_with_metadata(metadata):
if metadata is None:
return FUSSED_EMPTY_METADATA
else:
return _fuss(tuple(metadata))
class ChannelRpcRead(
collections.namedtuple(
'ChannelRpcRead',
('response', 'trailing_metadata', 'code', 'details',))):
pass
class ChannelRpcHandler(six.with_metaclass(abc.ABCMeta)):
@abc.abstractmethod
def initial_metadata(self):
raise NotImplementedError()
@abc.abstractmethod
def add_request(self, request):
raise NotImplementedError()
@abc.abstractmethod
def close_requests(self):
raise NotImplementedError()
@abc.abstractmethod
def take_response(self):
raise NotImplementedError()
@abc.abstractmethod
def cancel(self, code, details):
raise NotImplementedError()
@abc.abstractmethod
def termination(self):
raise NotImplementedError()
@abc.abstractmethod
def is_active(self):
raise NotImplementedError()
@abc.abstractmethod
def time_remaining(self):
raise NotImplementedError()
@abc.abstractmethod
def add_callback(self, callback):
raise NotImplementedError()
class ChannelHandler(six.with_metaclass(abc.ABCMeta)):
@abc.abstractmethod
def invoke_rpc(
self, method_full_rpc_name, invocation_metadata, requests,
requests_closed, timeout):
raise NotImplementedError()
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