Accepts normal iterable of request messages

src/python/grpcio/grpc/experimental/aio/_base_channel.py

@@ -14,12 +14,13 @@
 """Abstract base classes for Channel objects and Multicallable objects."""
 
 import abc
-from typing import Any, AsyncIterable, Optional
+from typing import Any, AsyncIterable, Iterable, Optional
 
 import grpc
 
 from . import _base_call
-from ._typing import DeserializingFunction, MetadataType, SerializingFunction
+from ._typing import (DeserializingFunction, MetadataType, RequestIterableType,
+                      SerializingFunction)
 
 _IMMUTABLE_EMPTY_TUPLE = tuple()
 
@@ -105,7 +106,7 @@ class StreamUnaryMultiCallable(abc.ABC):
 
     @abc.abstractmethod
     def __call__(self,
-                 request_async_iterator: Optional[AsyncIterable[Any]] = None,
+                 request_iterator: Optional[RequestIterableType] = None,
                  timeout: Optional[float] = None,
                  metadata: Optional[MetadataType] = _IMMUTABLE_EMPTY_TUPLE,
                  credentials: Optional[grpc.CallCredentials] = None,
@@ -115,7 +116,8 @@ class StreamUnaryMultiCallable(abc.ABC):
         """Asynchronously invokes the underlying RPC.
 
         Args:
-          request: The request value for the RPC.
+          request_iterator: An optional async iterable or iterable of request
+            messages for the RPC.
           timeout: An optional duration of time in seconds to allow
             for the RPC.
           metadata: Optional :term:`metadata` to be transmitted to the
@@ -142,7 +144,7 @@ class StreamStreamMultiCallable(abc.ABC):
 
     @abc.abstractmethod
     def __call__(self,
-                 request_async_iterator: Optional[AsyncIterable[Any]] = None,
+                 request_iterator: Optional[RequestIterableType] = None,
                  timeout: Optional[float] = None,
                  metadata: Optional[MetadataType] = _IMMUTABLE_EMPTY_TUPLE,
                  credentials: Optional[grpc.CallCredentials] = None,
@@ -152,7 +154,8 @@ class StreamStreamMultiCallable(abc.ABC):
         """Asynchronously invokes the underlying RPC.
 
         Args:
-          request: The request value for the RPC.
+          request_iterator: An optional async iterable or iterable of request
+            messages for the RPC.
           timeout: An optional duration of time in seconds to allow
             for the RPC.
           metadata: Optional :term:`metadata` to be transmitted to the

src/python/grpcio/grpc/experimental/aio/_call.py

@@ -15,6 +15,7 @@
 
 import asyncio
 import enum
+import inspect
 import logging
 from functools import partial
 from typing import AsyncIterable, Awaitable, Optional, Tuple
@@ -25,8 +26,8 @@ from grpc._cython import cygrpc
 
 from . import _base_call
 from ._typing import (DeserializingFunction, DoneCallbackType, MetadataType,
-                      MetadatumType, RequestType, ResponseType,
-                      SerializingFunction)
+                      MetadatumType, RequestIterableType, RequestType,
+                      ResponseType, SerializingFunction)
 
 __all__ = 'AioRpcError', 'Call', 'UnaryUnaryCall', 'UnaryStreamCall'
 
@@ -363,14 +364,14 @@ class _StreamRequestMixin(Call):
     _request_style: _APIStyle
 
     def _init_stream_request_mixin(
-            self, request_async_iterator: Optional[AsyncIterable[RequestType]]):
+            self, request_iterator: Optional[RequestIterableType]):
         self._metadata_sent = asyncio.Event(loop=self._loop)
         self._done_writing_flag = False
 
         # If user passes in an async iterator, create a consumer Task.
-        if request_async_iterator is not None:
+        if request_iterator is not None:
             self._async_request_poller = self._loop.create_task(
-                self._consume_request_iterator(request_async_iterator))
+                self._consume_request_iterator(request_iterator))
             self._request_style = _APIStyle.ASYNC_GENERATOR
         else:
             self._async_request_poller = None
@@ -392,12 +393,18 @@ class _StreamRequestMixin(Call):
     def _metadata_sent_observer(self):
         self._metadata_sent.set()
 
-    async def _consume_request_iterator(
-            self, request_async_iterator: AsyncIterable[RequestType]) -> None:
+    async def _consume_request_iterator(self,
+                                        request_iterator: RequestIterableType
+                                       ) -> None:
         try:
-            async for request in request_async_iterator:
-                await self._write(request)
-            await self._done_writing()
+            if inspect.isasyncgen(request_iterator):
+                async for request in request_iterator:
+                    await self._write(request)
+                await self._done_writing()
+            else:
+                for request in request_iterator:
+                    await self._write(request)
+                await self._done_writing()
         except AioRpcError as rpc_error:
             # Rpc status should be exposed through other API. Exceptions raised
             # within this Task won't be retrieved by another coroutine. It's
@@ -538,8 +545,7 @@ class StreamUnaryCall(_StreamRequestMixin, _UnaryResponseMixin, Call,
     """
 
     # pylint: disable=too-many-arguments
-    def __init__(self,
-                 request_async_iterator: Optional[AsyncIterable[RequestType]],
+    def __init__(self, request_iterator: Optional[RequestIterableType],
                  deadline: Optional[float], metadata: MetadataType,
                  credentials: Optional[grpc.CallCredentials],
                  wait_for_ready: Optional[bool], channel: cygrpc.AioChannel,
@@ -550,7 +556,7 @@ class StreamUnaryCall(_StreamRequestMixin, _UnaryResponseMixin, Call,
             channel.call(method, deadline, credentials, wait_for_ready),
             metadata, request_serializer, response_deserializer, loop)
 
-        self._init_stream_request_mixin(request_async_iterator)
+        self._init_stream_request_mixin(request_iterator)
         self._init_unary_response_mixin(self._conduct_rpc())
 
     async def _conduct_rpc(self) -> ResponseType:
@@ -577,8 +583,7 @@ class StreamStreamCall(_StreamRequestMixin, _StreamResponseMixin, Call,
     _initializer: asyncio.Task
 
     # pylint: disable=too-many-arguments
-    def __init__(self,
-                 request_async_iterator: Optional[AsyncIterable[RequestType]],
+    def __init__(self, request_iterator: Optional[RequestIterableType],
                  deadline: Optional[float], metadata: MetadataType,
                  credentials: Optional[grpc.CallCredentials],
                  wait_for_ready: Optional[bool], channel: cygrpc.AioChannel,
@@ -589,7 +594,7 @@ class StreamStreamCall(_StreamRequestMixin, _StreamResponseMixin, Call,
             channel.call(method, deadline, credentials, wait_for_ready),
             metadata, request_serializer, response_deserializer, loop)
         self._initializer = self._loop.create_task(self._prepare_rpc())
-        self._init_stream_request_mixin(request_async_iterator)
+        self._init_stream_request_mixin(request_iterator)
         self._init_stream_response_mixin(self._initializer)
 
     async def _prepare_rpc(self):

src/python/grpcio/grpc/experimental/aio/_channel.py

@@ -27,7 +27,7 @@ from ._call import (StreamStreamCall, StreamUnaryCall, UnaryStreamCall,
 from ._interceptor import (InterceptedUnaryUnaryCall,
                            UnaryUnaryClientInterceptor)
 from ._typing import (ChannelArgumentType, DeserializingFunction, MetadataType,
-                      SerializingFunction)
+                      SerializingFunction, RequestIterableType)
 from ._utils import _timeout_to_deadline
 
 _IMMUTABLE_EMPTY_TUPLE = tuple()
@@ -146,7 +146,7 @@ class StreamUnaryMultiCallable(_BaseMultiCallable,
                                _base_channel.StreamUnaryMultiCallable):
 
     def __call__(self,
-                 request_async_iterator: Optional[AsyncIterable[Any]] = None,
+                 request_iterator: Optional[RequestIterableType] = None,
                  timeout: Optional[float] = None,
                  metadata: Optional[MetadataType] = _IMMUTABLE_EMPTY_TUPLE,
                  credentials: Optional[grpc.CallCredentials] = None,
@@ -158,7 +158,7 @@ class StreamUnaryMultiCallable(_BaseMultiCallable,
 
         deadline = _timeout_to_deadline(timeout)
 
-        call = StreamUnaryCall(request_async_iterator, deadline, metadata,
+        call = StreamUnaryCall(request_iterator, deadline, metadata,
                                credentials, wait_for_ready, self._channel,
                                self._method, self._request_serializer,
                                self._response_deserializer, self._loop)
@@ -170,7 +170,7 @@ class StreamStreamMultiCallable(_BaseMultiCallable,
                                 _base_channel.StreamStreamMultiCallable):
 
     def __call__(self,
-                 request_async_iterator: Optional[AsyncIterable[Any]] = None,
+                 request_iterator: Optional[RequestIterableType] = None,
                  timeout: Optional[float] = None,
                  metadata: Optional[MetadataType] = _IMMUTABLE_EMPTY_TUPLE,
                  credentials: Optional[grpc.CallCredentials] = None,
@@ -182,7 +182,7 @@ class StreamStreamMultiCallable(_BaseMultiCallable,
 
         deadline = _timeout_to_deadline(timeout)
 
-        call = StreamStreamCall(request_async_iterator, deadline, metadata,
+        call = StreamStreamCall(request_iterator, deadline, metadata,
                                 credentials, wait_for_ready, self._channel,
                                 self._method, self._request_serializer,
                                 self._response_deserializer, self._loop)

src/python/grpcio/grpc/experimental/aio/_typing.py

@@ -13,7 +13,9 @@
 # limitations under the License.
 """Common types for gRPC Async API"""
 
-from typing import Any, AnyStr, Callable, Sequence, Tuple, TypeVar
+from typing import (Any, AnyStr, AsyncIterable, Callable, Iterable, Sequence,
+                    Tuple, TypeVar, Union)
+
 from grpc._cython.cygrpc import EOF
 
 RequestType = TypeVar('RequestType')
@@ -25,3 +27,4 @@ MetadataType = Sequence[MetadatumType]
 ChannelArgumentType = Sequence[Tuple[str, Any]]
 EOFType = type(EOF)
 DoneCallbackType = Callable[[Any], None]
+RequestIterableType = Union[Iterable[Any], AsyncIterable[Any]]

src/python/grpcio_tests/tests_aio/unit/call_test.py

@@ -559,6 +559,23 @@ class TestStreamUnaryCall(_MulticallableTestMixin, AioTestBase):
         # No failures in the cancel later task!
         await cancel_later_task
 
+    async def test_normal_iterable_requests(self):
+        # Prepares the request
+        payload = messages_pb2.Payload(body=b'\0' * _REQUEST_PAYLOAD_SIZE)
+        request = messages_pb2.StreamingInputCallRequest(payload=payload)
+        requests = [request] * _NUM_STREAM_RESPONSES
+
+        # Sends out requests
+        call = self._stub.StreamingInputCall(requests)
+
+        # RPC should succeed
+        response = await call
+        self.assertIsInstance(response, messages_pb2.StreamingInputCallResponse)
+        self.assertEqual(_NUM_STREAM_RESPONSES * _REQUEST_PAYLOAD_SIZE,
+                         response.aggregated_payload_size)
+
+        self.assertEqual(await call.code(), grpc.StatusCode.OK)
+
 
 # Prepares the request that stream in a ping-pong manner.
 _STREAM_OUTPUT_REQUEST_ONE_RESPONSE = messages_pb2.StreamingOutputCallRequest()
@@ -738,6 +755,15 @@ class TestStreamStreamCall(_MulticallableTestMixin, AioTestBase):
         # No failures in the cancel later task!
         await cancel_later_task
 
+    async def test_normal_iterable_requests(self):
+        requests = [_STREAM_OUTPUT_REQUEST_ONE_RESPONSE] * _NUM_STREAM_RESPONSES
+
+        call = self._stub.FullDuplexCall(iter(requests))
+        async for response in call:
+            self.assertEqual(_RESPONSE_PAYLOAD_SIZE, len(response.payload.body))
+
+        self.assertEqual(await call.code(), grpc.StatusCode.OK)
+
 
 if __name__ == '__main__':
     logging.basicConfig(level=logging.DEBUG)