1 # Copyright 2019 The gRPC Authors
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 """Common types for gRPC Async API"""
16 from typing import Any, AnyStr, Callable, Sequence, Text, Tuple, TypeVar
17 from grpc._cython.cygrpc import EOF
19 RequestType = TypeVar('RequestType')
20 ResponseType = TypeVar('ResponseType')
21 SerializingFunction = Callable[[Any], bytes]
22 DeserializingFunction = Callable[[bytes], Any]
23 MetadatumType = Tuple[Text, AnyStr]
24 MetadataType = Sequence[MetadatumType]
25 ChannelArgumentType = Sequence[Tuple[Text, Any]]
27 DoneCallbackType = Callable[[Any], None]