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# Copyright 2019 The 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 types for gRPC Async API"""
from typing import (Any, AsyncIterable, Callable, Iterable, Sequence, Tuple,
TypeVar, Union)
from grpc._cython.cygrpc import EOF
from ._metadata import Metadata
from ._metadata import MetadataKey
from ._metadata import MetadataValue
RequestType = TypeVar('RequestType')
ResponseType = TypeVar('ResponseType')
SerializingFunction = Callable[[Any], bytes]
DeserializingFunction = Callable[[bytes], Any]
MetadatumType = Tuple[MetadataKey, MetadataValue]
MetadataType = Union[Metadata, Sequence[MetadatumType]]
ChannelArgumentType = Sequence[Tuple[str, Any]]
EOFType = type(EOF)
DoneCallbackType = Callable[[Any], None]
RequestIterableType = Union[Iterable[Any], AsyncIterable[Any]]
ResponseIterableType = AsyncIterable[Any]
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