Skip to main content

Pure-Python gRPC implementation for asyncio

Project description

https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/7e1631d13476f1e870af0d5605b643fc14471a6d/banner-direct-single.svg

project documentation version tag downloads license

This project is based on hyper-h2 and requires Python >= 3.7.

Example

See examples directory in the project’s repository for all available examples.

Client

import asyncio

from grpclib.client import Channel

# generated by protoc
from .helloworld_pb2 import HelloRequest, HelloReply
from .helloworld_grpc import GreeterStub


async def main():
    async with Channel('127.0.0.1', 50051) as channel:
        greeter = GreeterStub(channel)

        reply = await greeter.SayHello(HelloRequest(name='Dr. Strange'))
        print(reply.message)


if __name__ == '__main__':
    asyncio.run(main())

Server

import asyncio

from grpclib.utils import graceful_exit
from grpclib.server import Server

# generated by protoc
from .helloworld_pb2 import HelloReply
from .helloworld_grpc import GreeterBase


class Greeter(GreeterBase):

    async def SayHello(self, stream):
        request = await stream.recv_message()
        message = f'Hello, {request.name}!'
        await stream.send_message(HelloReply(message=message))


async def main(*, host='127.0.0.1', port=50051):
    server = Server([Greeter()])
    # Note: graceful_exit isn't supported in Windows
    with graceful_exit([server]):
        await server.start(host, port)
        print(f'Serving on {host}:{port}')
        await server.wait_closed()


if __name__ == '__main__':
    asyncio.run(main())

Installation

$ pip3 install "grpclib[protobuf]"

Bug fixes and new features are frequently published via release candidates:

$ pip3 install --upgrade --pre "grpclib[protobuf]"

For the code generation you will also need a protoc compiler, which can be installed with protobuf system package:

$ brew install protobuf  # example for macOS users
$ protoc --version
libprotoc ...

Or you can use protoc compiler from the grpcio-tools Python package:

$ pip3 install grpcio-tools
$ python3 -m grpc_tools.protoc --version
libprotoc ...

Note: grpcio and grpcio-tools packages are not required in runtime, grpcio-tools package will be used only during code generation.

protoc plugin

In order to use this library you will have to generate special stub files using plugin provided, which can be used like this:

$ python3 -m grpc_tools.protoc -I. --python_out=. --grpclib_python_out=. helloworld/helloworld.proto
                                                    ^----- note -----^

This command will generate helloworld_pb2.py and helloworld_grpc.py files.

Plugin which implements --grpclib_python_out option should be available for the protoc compiler as the protoc-gen-grpclib_python executable which should be installed by pip into your $PATH during installation of the grpclib library.

Changed in v0.3.2: --python_grpc_out option was renamed into --grpclib_python_out.

Contributing

  • Please submit an issue before working on a Pull Request

  • Do not merge/squash/rebase your development branch while you work on a Pull Request, use rebase if this is really necessary

  • You may use Tox in order to test and lint your changes, but it is Ok to rely on CI for this matter

Project details


Release history Release notifications | RSS feed

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

grpclib-0.4.7.tar.gz (61.3 kB view details)

Uploaded Source

File details

Details for the file grpclib-0.4.7.tar.gz.

File metadata

  • Download URL: grpclib-0.4.7.tar.gz
  • Upload date:
  • Size: 61.3 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? No
  • Uploaded via: twine/4.0.2 CPython/3.7.17

File hashes

Hashes for grpclib-0.4.7.tar.gz
Algorithm Hash digest
SHA256 2988ef57c02b22b7a2e8e961792c41ccf97efc2ace91ae7a5b0de03c363823c3
MD5 60ce203e5b9f95de3d7e5721dbce2bd9
BLAKE2b-256 79b955936e462a5925190d7427e880b3033601d1effd13809b483d13a926061a

See more details on using hashes here.

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page