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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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61 lines
2.4 KiB
61 lines
2.4 KiB
# gRPC Python Server Reflection |
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This document shows how to use gRPC Server Reflection in gRPC Python. |
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Please see [C++ Server Reflection Tutorial](../server_reflection_tutorial.md) |
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for general information and more examples how to use server reflection. |
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## Enable server reflection in Python servers |
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gRPC Python Server Reflection is an add-on library. |
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To use it, first install the [grpcio-reflection](https://pypi.org/project/grpcio-reflection/) |
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PyPI package into your project. |
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Note that with Python you need to manually register the service |
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descriptors with the reflection service implementation when creating a server |
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(this isn't necessary with e.g. C++ or Java) |
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```python |
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# add the following import statement to use server reflection |
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from grpc_reflection.v1alpha import reflection |
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# ... |
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def serve(): |
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server = grpc.server(futures.ThreadPoolExecutor(max_workers=10)) |
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helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server) |
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# the reflection service will be aware of "Greeter" and "ServerReflection" services. |
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SERVICE_NAMES = ( |
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helloworld_pb2.DESCRIPTOR.services_by_name['Greeter'].full_name, |
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reflection.SERVICE_NAME, |
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) |
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reflection.enable_server_reflection(SERVICE_NAMES, server) |
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server.add_insecure_port('[::]:50051') |
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server.start() |
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``` |
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Please see |
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[greeter_server_with_reflection.py](https://github.com/grpc/grpc/blob/master/examples/python/helloworld/greeter_server_with_reflection.py) |
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in the examples directory for the full example, which extends the gRPC [Python |
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`Greeter` example](https://github.com/grpc/tree/master/examples/python/helloworld) on a |
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reflection-enabled server. |
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After starting the server, you can verify that the server reflection |
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is working properly by using the [`grpc_cli` command line |
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tool](https://github.com/grpc/grpc/blob/master/doc/command_line_tool.md): |
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```sh |
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$ grpc_cli ls localhost:50051 |
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``` |
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output: |
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```sh |
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grpc.reflection.v1alpha.ServerReflection |
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helloworld.Greeter |
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``` |
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For more examples and instructions how to use the `grpc_cli` tool, |
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please refer to the [`grpc_cli` documentation](../command_line_tool.md) |
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and the [C++ Server Reflection Tutorial](../server_reflection_tutorial.md). |
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## Additional Resources |
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The [Server Reflection Protocol](../server-reflection.md) provides detailed |
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information about how the server reflection works and describes the server reflection |
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protocol in detail.
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