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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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68 lines
2.6 KiB
68 lines
2.6 KiB
2 years ago
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# 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(stub: helloworld_pb2_grpc.GreeterStub, request_id: int,
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message: str):
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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 = [('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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with grpc.insecure_channel(target='localhost:50051',
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options=channel_options) 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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