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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 ```
81 lines
2.5 KiB
Python
81 lines
2.5 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 server that applies back-pressure on client"""
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from concurrent import futures
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import logging
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import time
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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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_PORT = "50051"
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class Greeter(helloworld_pb2_grpc.GreeterServicer):
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def SayHelloBidiStream(self, request_iterator, unused_context):
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# Delay read on server side to apply back-pressure on client
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time.sleep(5)
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bytes_received = 0
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# Read request from client on every iteration
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for i, request in enumerate(request_iterator, start=1):
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bytes_received += len(request.name)
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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"Request {i}: Received {bytes_received} bytes in total"
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)
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# Simulate server "work"
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time.sleep(1)
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# Send a response
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msg = "Hello!"
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yield helloworld_pb2.HelloReply(message=msg)
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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"Request {i}: Sent {bytes_received} bytes in total\n"
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)
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def serve():
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server = grpc.server(
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futures.ThreadPoolExecutor(max_workers=10),
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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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("grpc.max_concurrent_streams", 1),
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],
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)
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helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
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server.add_insecure_port("[::]:" + _PORT)
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server.start()
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print("Server started, listening on " + _PORT)
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server.wait_for_termination()
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if __name__ == "__main__":
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logging.basicConfig()
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serve()
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