From cef8dbf27c1c074f7d11681ffb4ae3805d727599 Mon Sep 17 00:00:00 2001
From: Tim Hughes <thughes@thegoldfish.org>
Date: Thu, 1 Oct 2020 00:05:11 +0100
Subject: [PATCH] Adds python aio helloworld examples

---
 .../python/helloworld/async_greeter_client.py | 37 ++++++++++++++++
 .../python/helloworld/async_greeter_server.py | 43 +++++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100644 examples/python/helloworld/async_greeter_client.py
 create mode 100644 examples/python/helloworld/async_greeter_server.py

diff --git a/examples/python/helloworld/async_greeter_client.py b/examples/python/helloworld/async_greeter_client.py
new file mode 100644
index 00000000000..e86cd30f8ea
--- /dev/null
+++ b/examples/python/helloworld/async_greeter_client.py
@@ -0,0 +1,37 @@
+# Copyright 2015 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.
+"""The Python implementation of the GRPC helloworld.Greeter client."""
+
+import logging
+import asyncio
+import grpc
+
+import helloworld_pb2
+import helloworld_pb2_grpc
+
+
+async def run():
+    # NOTE(gRPC Python Team): .close() is possible on a channel and should be
+    # used in circumstances in which the with statement does not fit the needs
+    # of the code.
+    async with grpc.aio.insecure_channel('localhost:50051') as channel:
+        stub = helloworld_pb2_grpc.GreeterStub(channel)
+        response = await stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
+    print("Greeter client received: " + response.message)
+
+
+if __name__ == '__main__':
+    logging.basicConfig()
+    asyncio.run(run())
+
diff --git a/examples/python/helloworld/async_greeter_server.py b/examples/python/helloworld/async_greeter_server.py
new file mode 100644
index 00000000000..79903aed8d7
--- /dev/null
+++ b/examples/python/helloworld/async_greeter_server.py
@@ -0,0 +1,43 @@
+# Copyright 2015 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.
+"""The Python implementation of the GRPC helloworld.Greeter server."""
+
+from concurrent import futures
+import logging
+import asyncio
+import grpc
+
+import helloworld_pb2
+import helloworld_pb2_grpc
+
+
+class Greeter(helloworld_pb2_grpc.GreeterServicer):
+
+    def SayHello(self, request, context):
+        return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
+
+
+async def serve():
+    server = grpc.aio.server(futures.ThreadPoolExecutor(max_workers=10))
+    helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
+    listen_addr = '[::]:50051'
+    server.add_insecure_port(listen_addr)
+    logging.info(f"Starting server on {listen_addr}")
+    await server.start()
+    await server.wait_for_termination()
+
+
+if __name__ == '__main__':
+    logging.basicConfig(level=logging.INFO)
+    asyncio.run(serve())