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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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71 lines
2.6 KiB
71 lines
2.6 KiB
# Copyright 2023 gRPC authors. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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"""gRPC Python helloworld.Greeter client with keepAlive channel options.""" |
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import logging |
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from time import sleep |
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import grpc |
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import helloworld_pb2 |
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import helloworld_pb2_grpc |
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def unary_call( |
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stub: helloworld_pb2_grpc.GreeterStub, request_id: int, message: str |
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): |
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print("call:", request_id) |
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try: |
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response = stub.SayHello(helloworld_pb2.HelloRequest(name=message)) |
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print(f"Greeter client received: {response.message}") |
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except grpc.RpcError as rpc_error: |
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print("Call failed with code: ", rpc_error.code()) |
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def run(): |
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""" |
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grpc.keepalive_time_ms: The period (in milliseconds) after which a keepalive ping is |
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sent on the transport. |
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grpc.keepalive_timeout_ms: The amount of time (in milliseconds) the sender of the keepalive |
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ping waits for an acknowledgement. If it does not receive an acknowledgment within this |
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time, it will close the connection. |
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grpc.keepalive_permit_without_calls: If set to 1 (0 : false; 1 : true), allows keepalive |
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pings to be sent even if there are no calls in flight. |
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grpc.http2.max_pings_without_data: How many pings can the client send before needing to |
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send a data/header frame. |
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For more details, check: https://github.com/grpc/grpc/blob/master/doc/keepalive.md |
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""" |
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channel_options = [ |
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("grpc.keepalive_time_ms", 8000), |
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("grpc.keepalive_timeout_ms", 5000), |
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("grpc.http2.max_pings_without_data", 5), |
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("grpc.keepalive_permit_without_calls", 1), |
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] |
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with grpc.insecure_channel( |
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target="localhost:50051", options=channel_options |
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) as channel: |
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stub = helloworld_pb2_grpc.GreeterStub(channel) |
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# Should succeed |
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unary_call(stub, 1, "you") |
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# Run 30s, run this with GRPC_VERBOSITY=DEBUG GRPC_TRACE=http_keepalive to observe logs. |
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# Client will be closed after receveing GOAWAY from server. |
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for i in range(30): |
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print(f"{i} seconds paased.") |
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sleep(1) |
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if __name__ == "__main__": |
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logging.basicConfig() |
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run()
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