Adds a helloworld sample in ruby.

ruby/.gitignore

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+/.bundle/
+/.yardoc
+/Gemfile.lock
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+*.bundle
+*.so
+*.o
+*.a
+mkmf.log
+vendor

ruby/Gemfile

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+# -*- ruby -*-
+# encoding: utf-8
+
+source 'https://rubygems.org/'
+
+# Update this to reflect the local installation of gRPC.
+gem 'grpc', path: '/usr/local/google/repos/grpc/src/ruby'
+
+# TODO: fix this if/when the gRPC repo structure changes.
+#
+# At the moment it's not possible to use grpc Ruby via git/github reference
+#
+# git 'git@github.com:grpc/grpc.git' do
+#   gem 'grpc'
+# end

ruby/README.md

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+gRPC Ruby Helloworld
+====================
+
+INSTALLATION PREREQUISITES
+--------------------------
+
+This requires Ruby 2.x, as the gRPC API surface uses keyword args.
+
+INSTALL
+-------
+
+- Clone this repository.
+- Follow the instructions in [INSTALL](https://github.com/grpc/grpc/blob/master/INSTALL) to install the gRPC C core.
+- *Temporary* Install gRPC for Ruby from source on your local machine and update path: to refer to it [Gemfile].
+  - this is needed until the gRPC ruby gem is published
+- Use bundler to install
+```sh
+$ # from this directory
+$ gem install bundler && bundle install
+```
+
+USAGE
+-----
+
+- Run the server
+```sh
+$ # from this directory
+$ bundle exec ./greeter_server.rb &
+```
+
+- Run the client
+```sh
+$ # from this directory
+$ bundle exec ./greeter_client.rb
+```

ruby/greeter.gemspec

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+# -*- ruby -*-
+# encoding: utf-8
+
+Gem::Specification.new do |s|
+  s.name          = 'grpc'
+  s.version       = '0.0.0'
+  s.authors       = ['gRPC Authors']
+  s.email         = 'temiola@google.com'
+  s.homepage      = 'https://github.com/google/grpc-common'
+  s.summary       = 'gRPC Ruby overview sample'
+  s.description   = 'Demonstrates how'
+
+  s.files         = `git ls-files -- ruby/*`.split("\n")
+  s.executables   = `git ls-files -- ruby/greeter*.rb`.split("\n").map do |f|
+    File.basename(f)
+  end
+  s.require_paths = ['lib']
+  s.platform      = Gem::Platform::RUBY
+
+  s.add_dependency 'grpc', '~> 0.0.1'
+
+  s.add_development_dependency 'bundler', '~> 1.7'
+end

ruby/greeter_client.rb

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+#!/usr/bin/env ruby
+
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Sample app that connects to a Greeter service.
+#
+# Usage: $ path/to/greeter_client.rb
+
+this_dir = File.expand_path(File.dirname(__FILE__))
+lib_dir = File.join(this_dir, 'lib')
+$LOAD_PATH.unshift(lib_dir) unless $LOAD_PATH.include?(lib_dir)
+
+require 'grpc'
+require 'helloworld_services'
+
+def main
+  stub = Helloworld::Greeter::Stub.new('localhost:50051')
+  user = ARGV.size > 0 ?  ARGV[0] : 'world'
+  message = stub.say_hello(Helloworld::HelloRequest.new(name: user)).message
+  p "Greeting: #{message}"
+end
+
+main

ruby/greeter_server.rb

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+#!/usr/bin/env ruby
+
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Sample gRPC server that implements the Greeter::Helloworld service.
+#
+# Usage: $ path/to/greeter_server.rb
+
+this_dir = File.expand_path(File.dirname(__FILE__))
+lib_dir = File.join(this_dir, 'lib')
+$LOAD_PATH.unshift(lib_dir) unless $LOAD_PATH.include?(lib_dir)
+
+require 'grpc'
+require 'helloworld_services'
+
+# GreeterServer is simple server that implements the Helloworld Greeter server.
+class GreeterServer < Helloworld::Greeter::Service
+  # say_hello implements the sayHello rpc method.
+  def say_hello(hello_req, _unused_call)
+    Helloworld::HelloReply.new(message: "Hello #{hello_req.name}")
+  end
+end
+
+# main starts an RpcServer that receives requests to GreeterServer at the sample
+# server port.
+def main
+  s = GRPC::RpcServer.new
+  s.add_http2_port('0.0.0.0:50051')
+  s.handle(GreeterServer)
+  s.run
+end
+
+main

ruby/lib/helloworld.rb

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+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: helloworld.proto
+
+require 'google/protobuf'
+
+Google::Protobuf::DescriptorPool.generated_pool.build do
+  add_message "helloworld.HelloRequest" do
+    optional :name, :string, 1
+  end
+  add_message "helloworld.HelloReply" do
+    optional :message, :string, 1
+  end
+end
+
+module Helloworld
+  HelloRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("helloworld.HelloRequest").msgclass
+  HelloReply = Google::Protobuf::DescriptorPool.generated_pool.lookup("helloworld.HelloReply").msgclass
+end

ruby/lib/helloworld_services.rb

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+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# Source: helloworld.proto for package 'helloworld'
+
+require 'grpc'
+require 'helloworld'
+
+module Helloworld
+  module Greeter
+
+    # TODO: add proto service documentation here
+    class Service
+
+      include GRPC::GenericService
+
+      self.marshal_class_method = :encode
+      self.unmarshal_class_method = :decode
+      self.service_name = 'helloworld.Greeter'
+
+      rpc :sayHello, HelloRequest, HelloReply
+    end
+
+    Stub = Service.rpc_stub_class
+  end
+end