grpc

An R library for GRPC a high-performance, open-source universal RPC framework.

Installation - Debian

Pre-requisites

The following is copied from gRPC C++ - Building from source

sudo apt-get install build-essential autoconf libtool pkg-config
## If you plan to build from source and run tests, install the following as well:
sudo apt-get install libgflags-dev libgtest-dev
sudo apt-get install clang libc++-dev

Download and Install grpc

git clone -b $(curl -L https://grpc.io/release) https://github.com/grpc/grpc grpc_base
cd grpc_base
git submodule update --init

## In gcc 8.2 I got an error which I could fix with (see https://github.com/grpc/grpc/issues/17781)
## with the following two export lines. (uncomment and run if you gat an error when calling make).
#export CFLAGS='-g -O2 -w' 
#export CXXFLAGS='-g -O2 -w'

make
sudo make install
sudo ldconfig

Original

Easily create gRPC clients and servers from protobuf descriptions to build distributed services.

Copyright 2015 Google Inc, 2017 Neal Fultz

Dependencies

• grpc
• protobuf
• RProtoBuf

See install for my installation notes...

Examples

There are runnable examples in the demo/ folder.

Hello, World!

To start a HelloWorld server:

R -e 'demo("helloserver", "grpc")'

Or with much more detailed logging:

R -e 'library(futile.logger); flog.threshold(TRACE); demo("helloserver", "grpc")'

To run a client against a running HelloWorld server:

R -e 'demo("helloclient", "grpc")'

Both are cross compatible with the Node, Python and C++ Greeter examples provided by the grpc library.

Health check

This server implements the above service along with the standard GRPC Health Checking Protocol:

R -e 'demo("health-check-server", "grpc")'

The client runs a health-check then calls the Hello, World! method once:

R -e 'demo("health-check-client", "grpc")'

Please check the sources of the server to see how to bundle services defined in multiple proto files.

Live scoring

There's a simple trained on the iris dataset and making that available for scoring via a gRPC service:

R -e 'demo("iris-server", "grpc")'

An example client to this service from R:

R -e 'demo("iris-client", "grpc")'

Todo

• Streaming services
• Authentication and Encryption
• Error handling
• Docs

Contributing