Initial checkin of gRPC to third_party/

third_party/grpc/src/ruby/bin/apis/pubsub_demo.rb

Index: third_party/grpc/src/ruby/bin/apis/pubsub_demo.rb
diff --git a/third_party/grpc/src/ruby/bin/apis/pubsub_demo.rb b/third_party/grpc/src/ruby/bin/apis/pubsub_demo.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.
+
+# pubsub_demo demos accesses the Google PubSub API via its gRPC interface
+#
+# $ GOOGLE_APPLICATION_CREDENTIALS=<path_to_service_account_key_file> \
+#   path/to/pubsub_demo.rb \
+#   [--action=<chosen_demo_action> ]
+#
+# There are options related to the chosen action, see #parse_args below.
+# - the possible actions are given by the method names of NamedAction class
+# - the default action is list_some_topics
+
+this_dir = File.expand_path(File.dirname(__FILE__))
+lib_dir = File.join(File.dirname(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 'optparse'
+
+require 'grpc'
+require 'googleauth'
+require 'google/protobuf'
+
+require 'google/protobuf/empty'
+require 'tech/pubsub/proto/pubsub'
+require 'tech/pubsub/proto/pubsub_services'
+
+# creates a SSL Credentials from the production certificates.
+def ssl_creds
+  GRPC::Core::ChannelCredentials.new()
+end
+
+# Builds the metadata authentication update proc.
+def auth_proc(opts)
+  auth_creds = Google::Auth.get_application_default
+  return auth_creds.updater_proc
+end
+
+# Creates a stub for accessing the publisher service.
+def publisher_stub(opts)
+  address = "#{opts.host}:#{opts.port}"
+  stub_clz = Tech::Pubsub::PublisherService::Stub # shorter
+  GRPC.logger.info("... access PublisherService at #{address}")
+  call_creds = GRPC::Core::CallCredentials.new(auth_proc(opts))
+  combined_creds = ssl_creds.compose(call_creds)
+  stub_clz.new(address, creds: combined_creds,
+               GRPC::Core::Channel::SSL_TARGET => opts.host)
+end
+
+# Creates a stub for accessing the subscriber service.
+def subscriber_stub(opts)
+  address = "#{opts.host}:#{opts.port}"
+  stub_clz = Tech::Pubsub::SubscriberService::Stub # shorter
+  GRPC.logger.info("... access SubscriberService at #{address}")
+  call_creds = GRPC::Core::CallCredentials.new(auth_proc(opts))
+  combined_creds = ssl_creds.compose(call_creds)
+  stub_clz.new(address, creds: combined_creds,
+               GRPC::Core::Channel::SSL_TARGET => opts.host)
+end
+
+# defines methods corresponding to each interop test case.
+class NamedActions
+  include Tech::Pubsub
+
+  # Initializes NamedActions
+  #
+  # @param pub [Stub] a stub for accessing the publisher service
+  # @param sub [Stub] a stub for accessing the publisher service
+  # @param args [Args] provides access to the command line
+  def initialize(pub, sub, args)
+    @pub = pub
+    @sub = sub
+    @args = args
+  end
+
+  # Removes the test topic if it exists
+  def remove_topic
+    name = test_topic_name
+    p "... removing Topic #{name}"
+    @pub.delete_topic(DeleteTopicRequest.new(topic: name))
+    p "removed Topic: #{name} OK"
+  rescue GRPC::BadStatus => e
+    p "Could not delete a topics: rpc failed with '#{e}'"
+  end
+
+  # Creates a test topic
+  def create_topic
+    name = test_topic_name
+    p "... creating Topic #{name}"
+    resp = @pub.create_topic(Topic.new(name: name))
+    p "created Topic: #{resp.name} OK"
+  rescue GRPC::BadStatus => e
+    p "Could not create a topics: rpc failed with '#{e}'"
+  end
+
+  # Lists topics in the project
+  def list_some_topics
+    p 'Listing topics'
+    p '-------------_'
+    list_project_topics.topic.each { |t| p t.name }
+  rescue GRPC::BadStatus => e
+    p "Could not list topics: rpc failed with '#{e}'"
+  end
+
+  # Checks if a topics exists in a project
+  def check_exists
+    name = test_topic_name
+    p "... checking for topic #{name}"
+    exists = topic_exists?(name)
+    p "#{name} is a topic" if exists
+    p "#{name} is not a topic" unless exists
+  rescue GRPC::BadStatus => e
+    p "Could not check for a topics: rpc failed with '#{e}'"
+  end
+
+  # Publishes some messages
+  def random_pub_sub
+    topic_name, sub_name = test_topic_name, test_sub_name
+    create_topic_if_needed(topic_name)
+    @sub.create_subscription(Subscription.new(name: sub_name,
+                                              topic: topic_name))
+    msg_count = rand(10..30)
+    msg_count.times do |x|
+      msg = PubsubMessage.new(data: "message #{x}")
+      @pub.publish(PublishRequest.new(topic: topic_name, message: msg))
+    end
+    p "Sent #{msg_count} messages to #{topic_name}, checking for them now."
+    batch = @sub.pull_batch(PullBatchRequest.new(subscription: sub_name,
+                                                 max_events: msg_count))
+    ack_ids = batch.pull_responses.map { |x| x.ack_id }
+    p "Got #{ack_ids.size} messages; acknowledging them.."
+    @sub.acknowledge(AcknowledgeRequest.new(subscription: sub_name,
+                                            ack_id: ack_ids))
+    p "Test messages were acknowledged OK, deleting the subscription"
+    del_req = DeleteSubscriptionRequest.new(subscription: sub_name)
+    @sub.delete_subscription(del_req)
+  rescue GRPC::BadStatus => e
+    p "Could not do random pub sub: rpc failed with '#{e}'"
+  end
+
+  private
+
+  # test_topic_name is the topic name to use in this test.
+  def test_topic_name
+    unless @args.topic_name.nil?
+      return "/topics/#{@args.project_id}/#{@args.topic_name}"
+    end
+    now_text = Time.now.utc.strftime('%Y%m%d%H%M%S%L')
+    "/topics/#{@args.project_id}/#{ENV['USER']}-#{now_text}"
+  end
+
+  # test_sub_name is the subscription name to use in this test.
+  def test_sub_name
+    unless @args.sub_name.nil?
+      return "/subscriptions/#{@args.project_id}/#{@args.sub_name}"
+    end
+    now_text = Time.now.utc.strftime('%Y%m%d%H%M%S%L')
+    "/subscriptions/#{@args.project_id}/#{ENV['USER']}-#{now_text}"
+  end
+
+  # determines if the topic name exists
+  def topic_exists?(name)
+    topics = list_project_topics.topic.map { |t| t.name }
+    topics.include?(name)
+  end
+
+  def create_topic_if_needed(name)
+    return if topic_exists?(name)
+    @pub.create_topic(Topic.new(name: name))
+  end
+
+  def list_project_topics
+    q = "cloud.googleapis.com/project in (/projects/#{@args.project_id})"
+    @pub.list_topics(ListTopicsRequest.new(query: q))
+  end
+end
+
+# Args is used to hold the command line info.
+Args = Struct.new(:host, :port, :action, :project_id, :topic_name,
+                  :sub_name)
+
+# validates the the command line options, returning them as an Arg.
+def parse_args
+  args = Args.new('pubsub-staging.googleapis.com',
+                   443, 'list_some_topics', 'stoked-keyword-656')
+  OptionParser.new do |opts|
+    opts.on('--server_host SERVER_HOST', 'server hostname') do |v|
+      args.host = v
+    end
+    opts.on('--server_port SERVER_PORT', 'server port') do |v|
+      args.port = v
+    end
+
+    # instance_methods(false) gives only the methods defined in that class.
+    scenes = NamedActions.instance_methods(false).map { |t| t.to_s }
+    scene_list = scenes.join(',')
+    opts.on("--action CODE", scenes, {}, 'pick a demo action',
+            "  (#{scene_list})") do |v|
+      args.action = v
+    end
+
+    # Set the remaining values.
+    %w(project_id topic_name sub_name).each do |o|
+      opts.on("--#{o} VALUE", "#{o}") do |v|
+        args[o] = v
+      end
+    end
+  end.parse!
+  _check_args(args)
+end
+
+def _check_args(args)
+  %w(host port action).each do |a|
+    if args[a].nil?
+      raise OptionParser::MissingArgument.new("please specify --#{a}")
+    end
+  end
+  args
+end
+
+def main
+  args = parse_args
+  pub, sub = publisher_stub(args), subscriber_stub(args)
+  NamedActions.new(pub, sub, args).method(args.action).call
+end
+
+main