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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/
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grpc/examples/python/retry/README.md

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Retry Example in gRPC Python

Prerequisite

  • grpcio >= 1.39.0
  • grpcio-tools >= 1.39.0

Running the example

In terminal 1, start the flaky server:

python3 flaky_server.py

In terminal 2, start the retry clients:

python3 retry_client.py
# Or
python3 async_retry_client.py

Expect results

The client RPC will succeed, even with server injecting multiple errors. Here is an example server log:

$ python3 flaky_server.py
INFO:root:Starting flaky server on [::]:50051
INFO:root:Injecting error to RPC from ipv6:[::1]:54471
INFO:root:Successfully responding to RPC from ipv6:[::1]:54473
INFO:root:Injecting error to RPC from ipv6:[::1]:54491
INFO:root:Injecting error to RPC from ipv6:[::1]:54581
INFO:root:Injecting error to RPC from ipv6:[::1]:54581
INFO:root:Injecting error to RPC from ipv6:[::1]:54581
INFO:root:Injecting error to RPC from ipv6:[::1]:54581
INFO:root:Successfully responding to RPC from ipv6:[::1]:54581
INFO:root:Injecting error to RPC from ipv6:[::1]:55474
INFO:root:Injecting error to RPC from ipv6:[::1]:55474
INFO:root:Injecting error to RPC from ipv6:[::1]:55474
INFO:root:Injecting error to RPC from ipv6:[::1]:55474
INFO:root:Successfully responding to RPC from ipv6:[::1]:55474
INFO:root:Injecting error to RPC from ipv6:[::1]:55533
INFO:root:Injecting error to RPC from ipv6:[::1]:55533
INFO:root:Injecting error to RPC from ipv6:[::1]:55533
INFO:root:Successfully responding to RPC from ipv6:[::1]:55533