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7ff0c56ebd
Have added the required client, server, proto and proto generated files. The design of the example is as follows: 1. The client sends a bulk amount of data(approx. 2 KB in each iteration) to the server in a streaming call. 2. The server applies back-pressure by delaying reading of the requests, which makes the client pause sending requests after around 64KB 3. The client then resumes sending requests only after the server reads a few requests and clears the buffer. By adding print statements on data send/receive on both client and server side, the client pausing/resuming requests can be seen clearly. The client and server logs can be seen below: **Client Logs** ``` Request 10: Sent 20000 bytes in total Request 20: Sent 40000 bytes in total Request 30: Sent 60000 bytes in total Request 40: Sent 80000 bytes in total Received 10 responses Request 50: Sent 100000 bytes in total Received 20 responses Request 60: Sent 120000 bytes in total Received 30 responses Request 70: Sent 140000 bytes in total Received 40 responses Request 80: Sent 160000 bytes in total Received 50 responses Request 90: Sent 180000 bytes in total Received 60 responses Request 100: Sent 200000 bytes in total Received 70 responses Received 80 responses Received 90 responses Received 100 responses ``` **Server Logs** ``` Server started, listening on 50051 Request 10: Received 20000 bytes in total Request 10: Sent 20000 bytes in total Request 20: Received 40000 bytes in total Request 20: Sent 40000 bytes in total Request 30: Received 60000 bytes in total Request 30: Sent 60000 bytes in total Request 40: Received 80000 bytes in total Request 40: Sent 80000 bytes in total Request 50: Received 100000 bytes in total Request 50: Sent 100000 bytes in total Request 60: Received 120000 bytes in total Request 60: Sent 120000 bytes in total Request 70: Received 140000 bytes in total Request 70: Sent 140000 bytes in total Request 80: Received 160000 bytes in total Request 80: Sent 160000 bytes in total Request 90: Received 180000 bytes in total Request 90: Sent 180000 bytes in total Request 100: Received 200000 bytes in total Request 100: Sent 200000 bytes in total ```
64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
# Copyright 2024 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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"""Example gRPC client to depict flow control in gRPC"""
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import logging
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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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import helpers
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def get_iter_data():
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max_iter = 100
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data_size = 2000
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test_request_data = bytes("1" * data_size, "utf-8")
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for i in range(1, (max_iter + 1)):
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if (i % 10) == 0:
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print(
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f"\n{helpers.get_current_time()} "
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f"Request {i}: Sent {(data_size*i)} bytes in total"
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)
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yield helloworld_pb2.HelloRequest(name=test_request_data)
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def run():
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with grpc.insecure_channel(
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"localhost:50051",
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# Setting server options to minimal, to allow low number of maximum
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# bytes in the window
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# `bdp_probe` is set to 0(false) to disable resizing of window
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options=[
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("grpc.http2.max_frame_size", 16384),
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("grpc.http2.bdp_probe", 0),
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],
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) as channel:
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stub = helloworld_pb2_grpc.GreeterStub(channel)
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responses = stub.SayHelloBidiStream(get_iter_data())
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for i, _ in enumerate(responses, start=1):
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if (i % 10) == 0:
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print(
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f"{helpers.get_current_time()} "
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f"Received {i} responses\n"
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)
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if __name__ == "__main__":
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logging.basicConfig()
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run()
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