150 lines
4.0 KiB
ReStructuredText
150 lines
4.0 KiB
ReStructuredText
Pure-Python gRPC implementation for asyncio
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===========================================
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|project|_ |documentation|_ |version|_ |tag|_ |license|_
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This project is based on `hyper-h2`_ and **requires Python >= 3.6**.
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.. contents::
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:local:
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Example
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~~~~~~~
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See `examples`_ directory in the project's repository for all available
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examples.
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Client
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------
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.. code-block:: python3
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import asyncio
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from grpclib.client import Channel
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# generated by protoc
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from .helloworld_pb2 import HelloRequest, HelloReply
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from .helloworld_grpc import GreeterStub
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async def main():
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channel = Channel('127.0.0.1', 50051)
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greeter = GreeterStub(channel)
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reply: HelloReply = await greeter.SayHello(HelloRequest(name='Dr. Strange'))
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print(reply.message)
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channel.close()
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if __name__ == '__main__':
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asyncio.run(main())
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Server
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------
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.. code-block:: python3
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import asyncio
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from grpclib.utils import graceful_exit
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from grpclib.server import Server
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# generated by protoc
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from .helloworld_pb2 import HelloRequest, HelloReply
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from .helloworld_grpc import GreeterBase
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class Greeter(GreeterBase):
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async def SayHello(self, stream):
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request: HelloRequest = await stream.recv_message()
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message = f'Hello, {request.name}!'
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await stream.send_message(HelloReply(message=message))
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async def main(*, host='127.0.0.1', port=50051):
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server = Server([Greeter()])
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with graceful_exit([server]):
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await server.start(host, port)
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print(f'Serving on {host}:{port}')
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await server.wait_closed()
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if __name__ == '__main__':
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asyncio.run(main())
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Installation
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~~~~~~~~~~~~
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.. code-block:: shell
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$ pip3 install grpclib protobuf
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Bug fixes and new features are frequently published via release candidates:
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.. code-block:: shell
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$ pip3 install --upgrade --pre grpclib
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For the code generation you will also need a ``protoc`` compiler, which can be
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installed with ``protobuf`` system package:
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.. code-block:: shell
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$ brew install protobuf # example for macOS users
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$ protoc --version
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libprotoc ...
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**Or** you can use ``protoc`` compiler from the ``grpcio-tools`` Python package:
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.. code-block:: shell
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$ pip3 install grpcio-tools
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$ python3 -m grpc_tools.protoc --version
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libprotoc ...
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**Note:** ``grpcio`` and ``grpcio-tools`` packages are **not required in
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runtime**, ``grpcio-tools`` package will be used only during code generation.
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``protoc`` plugin
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~~~~~~~~~~~~~~~~~
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In order to use this library you will have to generate special stub files using
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plugin provided, which can be used like this:
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.. code-block:: shell
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$ python3 -m grpc_tools.protoc -I. --python_out=. --python_grpc_out=. helloworld/helloworld.proto
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This command will generate ``helloworld_pb2.py`` and ``helloworld_grpc.py``
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files.
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Plugin, which implements ``--python_grpc_out`` option is available for
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``protoc`` compiler as ``protoc-gen-python_grpc`` executable, which will be
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installed by ``pip/setuptools`` into your ``$PATH`` during installation of the
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``grpclib`` library.
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Contributing
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~~~~~~~~~~~~
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Use Tox_ in order to test and lint your changes.
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.. _gRPC: http://www.grpc.io
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.. _hyper-h2: https://github.com/python-hyper/hyper-h2
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.. _grpcio: https://pypi.org/project/grpcio/
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.. _Tox: https://tox.readthedocs.io/
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.. _examples: https://github.com/vmagamedov/grpclib/tree/master/examples
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.. |version| image:: https://img.shields.io/pypi/v/grpclib.svg?label=stable&color=green
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.. _version: https://pypi.org/project/grpclib/
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.. |license| image:: https://img.shields.io/pypi/l/grpclib.svg
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.. _license: https://github.com/vmagamedov/grpclib/blob/master/LICENSE.txt
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.. |tag| image:: https://img.shields.io/github/tag/vmagamedov/grpclib.svg?label=latest
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.. _tag: https://pypi.org/project/grpclib/#history
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.. |project| image:: https://img.shields.io/badge/vmagamedov%2Fgrpclib-blueviolet.svg?logo=github
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.. _project: https://github.com/vmagamedov/grpclib
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.. |documentation| image:: https://img.shields.io/badge/docs-grpclib.rtfd.io-blue.svg
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.. _documentation: https://grpclib.readthedocs.io/en/latest/
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