Initial checkin of gRPC to third_party/

third_party/grpc/src/ruby/bin/math_server.rb

Index: third_party/grpc/src/ruby/bin/math_server.rb
diff --git a/third_party/grpc/src/ruby/bin/math_server.rb b/third_party/grpc/src/ruby/bin/math_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 Ruby server that implements the Math::Calc service and helps
+# validate GRPC::RpcServer as GRPC implementation using proto2 serialization.
+#
+# Usage: $ path/to/math_server.rb
+
+this_dir = File.expand_path(File.dirname(__FILE__))
+lib_dir = File.join(File.dirname(this_dir), 'lib')
+$LOAD_PATH.unshift(lib_dir) unless $LOAD_PATH.include?(lib_dir)
+$LOAD_PATH.unshift(this_dir) unless $LOAD_PATH.include?(this_dir)
+
+require 'forwardable'
+require 'grpc'
+require 'logger'
+require 'math_services'
+require 'optparse'
+
+# RubyLogger defines a logger for gRPC based on the standard ruby logger.
+module RubyLogger
+  def logger
+    LOGGER
+  end
+
+  LOGGER = Logger.new(STDOUT)
+end
+
+# GRPC is the general RPC module
+module GRPC
+  # Inject the noop #logger if no module-level logger method has been injected.
+  extend RubyLogger
+end
+
+# Holds state for a fibonacci series
+class Fibber
+  def initialize(limit)
+    fail "bad limit: got #{limit}, want limit > 0" if limit < 1
+    @limit = limit
+  end
+
+  def generator
+    return enum_for(:generator) unless block_given?
+    idx, current, previous = 0, 1, 1
+    until idx == @limit
+      if idx.zero? || idx == 1
+        yield Math::Num.new(num: 1)
+        idx += 1
+        next
+      end
+      tmp = current
+      current = previous + current
+      previous = tmp
+      yield Math::Num.new(num: current)
+      idx += 1
+    end
+  end
+end
+
+# A EnumeratorQueue wraps a Queue to yield the items added to it.
+class EnumeratorQueue
+  extend Forwardable
+  def_delegators :@q, :push
+
+  def initialize(sentinel)
+    @q = Queue.new
+    @sentinel = sentinel
+  end
+
+  def each_item
+    return enum_for(:each_item) unless block_given?
+    loop do
+      r = @q.pop
+      break if r.equal?(@sentinel)
+      fail r if r.is_a? Exception
+      yield r
+    end
+  end
+end
+
+# The Math::Math:: module occurs because the service has the same name as its
+# package. That practice should be avoided by defining real services.
+class Calculator < Math::Math::Service
+  def div(div_args, _call)
+    if div_args.divisor.zero?
+      # To send non-OK status handlers raise a StatusError with the code and
+      # and detail they want sent as a Status.
+      fail GRPC::StatusError.new(GRPC::Status::INVALID_ARGUMENT,
+                                 'divisor cannot be 0')
+    end
+
+    Math::DivReply.new(quotient: div_args.dividend / div_args.divisor,
+                       remainder: div_args.dividend % div_args.divisor)
+  end
+
+  def sum(call)
+    # the requests are accesible as the Enumerator call#each_request
+    nums = call.each_remote_read.collect(&:num)
+    sum = nums.inject { |s, x| s + x }
+    Math::Num.new(num: sum)
+  end
+
+  def fib(fib_args, _call)
+    if fib_args.limit < 1
+      fail StatusError.new(Status::INVALID_ARGUMENT, 'limit must be >= 0')
+    end
+
+    # return an Enumerator of Nums
+    Fibber.new(fib_args.limit).generator
+    # just return the generator, GRPC::GenericServer sends each actual response
+  end
+
+  def div_many(requests)
+    # requests is an lazy Enumerator of the requests sent by the client.
+    q = EnumeratorQueue.new(self)
+    t = Thread.new do
+      begin
+        requests.each do |req|
+          GRPC.logger.info("read #{req.inspect}")
+          resp = Math::DivReply.new(quotient: req.dividend / req.divisor,
+                                    remainder: req.dividend % req.divisor)
+          q.push(resp)
+          Thread.pass  # let the internal Bidi threads run
+        end
+        GRPC.logger.info('finished reads')
+        q.push(self)
+      rescue StandardError => e
+        q.push(e)  # share the exception with the enumerator
+        raise e
+      end
+    end
+    t.priority = -2  # hint that the div_many thread should not be favoured
+    q.each_item
+  end
+end
+
+def load_test_certs
+  this_dir = File.expand_path(File.dirname(__FILE__))
+  data_dir = File.join(File.dirname(this_dir), 'spec/testdata')
+  files = ['ca.pem', 'server1.key', 'server1.pem']
+  files.map { |f| File.open(File.join(data_dir, f)).read }
+end
+
+def test_server_creds
+  certs = load_test_certs
+  GRPC::Core::ServerCredentials.new(
+    nil, [{ private_key: certs[1], cert_chain: certs[2] }], false)
+end
+
+def main
+  options = {
+    'host' => 'localhost:7071',
+    'secure' => false
+  }
+  OptionParser.new do |opts|
+    opts.banner = 'Usage: [--host <hostname>:<port>] [--secure|-s]'
+    opts.on('--host HOST', '<hostname>:<port>') do |v|
+      options['host'] = v
+    end
+    opts.on('-s', '--secure', 'access using test creds') do |v|
+      options['secure'] = v
+    end
+  end.parse!
+
+  s = GRPC::RpcServer.new
+  if options['secure']
+    s.add_http2_port(options['host'], test_server_creds)
+    GRPC.logger.info("... running securely on #{options['host']}")
+  else
+    s.add_http2_port(options['host'], :this_port_is_insecure)
+    GRPC.logger.info("... running insecurely on #{options['host']}")
+  end
+
+  s.handle(Calculator)
+  s.run_till_terminated
+end
+
+main