Extracted runtime command with improved options

Gemfile

@@ -11,6 +11,7 @@ gem "simplecov", require: false, group: :test
 
 gem "ffi-rzmq"
 gem "zeitwerk"
+gem "docopt"
 
 group :development, :test do
   # gem "bundler"

Gemfile.lock

@@ -33,6 +33,7 @@ GEM
       aws-eventstream (~> 1.0, >= 1.0.2)
     concurrent-ruby (1.1.5)
     docile (1.3.2)
+    docopt (0.6.1)
     ffi (1.11.1)
     ffi-rzmq (2.0.7)
       ffi-rzmq-core (>= 1.0.7)
@@ -69,6 +70,7 @@ DEPENDENCIES
   activesupport
   aws-sdk-ecr
   aws-sdk-s3
+  docopt
   ffi-rzmq
   mandate
   minitest

bin/router

@@ -3,9 +3,4 @@ require "bundler/setup"
 $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 
 require "pipeline"
-
-Pipeline.load_config(File.expand_path('../../config/pipeline.yml', __FILE__))
-context = ZMQ::Context.new
-router = Pipeline::Rpc::Router.new(context)
-
-router.run
+Pipeline::Cmd::RouterDaemon.(ARGV)

bin/worker

@@ -4,9 +4,4 @@ $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 
 require "pipeline"
 
-worker_identity = ARGV[0]
-channel_address = ARGV[1]
-env_base = ARGV[2]
-
-daemon = Pipeline::Rpc::Worker::Daemon.new(worker_identity, channel_address, env_base)
-daemon.listen
+Pipeline::Cmd::WorkerDaemon.(ARGV)

lib/pipeline/cmd/router_daemon.rb

@@ -0,0 +1,50 @@
+require "docopt"
+
+module Pipeline::Cmd
+
+  class RouterDaemon
+
+    SPEC = <<-DOCOPT
+    Exercism router.
+
+    Usage:
+      #{__FILE__} <configuration_file> [--force-worker-restart]
+      #{__FILE__} -h | --help
+      #{__FILE__} --version
+
+    DOCOPT
+
+    include Mandate
+
+    initialize_with :argv
+
+    def call
+      puts "*** Exercism Router ***"
+      router.force_worker_restart! if restart_workers?
+      router.run
+    end
+
+    def options
+      @options ||= begin
+        Docopt::docopt(SPEC, argv: argv)
+      rescue Docopt::Exit => e
+        puts e.message
+        exit 1
+      end
+    end
+
+    def restart_workers?
+      options["--force-worker-restart"] == true
+    end
+
+    def router
+      @router ||= begin
+        config_file = options["<configuration_file>"]
+        context = ZMQ::Context.new
+        Pipeline.load_config(config_file)
+        Pipeline::Rpc::Router.new(context)
+      end
+    end
+
+  end
+end

lib/pipeline/cmd/worker_daemon.rb

@@ -0,0 +1,65 @@
+require "docopt"
+
+module Pipeline::Cmd
+
+  class WorkerDaemon
+
+    SPEC = <<-DOCOPT
+    Exercism worker.
+
+    Usage:
+      #{__FILE__} (listen|configure) <identity> <channel_address> <work_folder> [--dryrun]
+      #{__FILE__} -h | --help
+      #{__FILE__} --version
+
+    DOCOPT
+
+    include Mandate
+
+    initialize_with :argv
+
+    def call
+      puts "*** Exercism Worker ***"
+
+      begin
+        daemon.bootstrap
+        exit 0 if dryrun?
+
+        daemon.configure
+        exit 0 if configure?
+
+        daemon.listen
+      rescue Pipeline::Rpc::Worker::DaemonRestartException
+        puts "Restarting Daemon"
+        retry
+      end
+    end
+
+    def options
+      @options ||= begin
+        Docopt::docopt(SPEC, argv: argv)
+      rescue Docopt::Exit => e
+        puts e.message
+        exit 1
+      end
+    end
+
+    def dryrun?
+      options["--dryrun"] == true
+    end
+
+    def configure?
+      options["configure"] == true
+    end
+
+    def daemon
+      @daemon ||= begin
+        worker_identity = options["<identity>"]
+        channel_address = options["<channel_address>"]
+        env_base = options["<work_folder>"]
+        Pipeline::Rpc::Worker::Daemon.new(worker_identity, channel_address, env_base)
+      end
+    end
+
+  end
+end

lib/pipeline/rpc/notification_socket.rb

@@ -10,8 +10,10 @@ module Pipeline::Rpc
       @socket.bind("tcp://*:#{@port}")
     end
 
-    def emit_configuration(configuration)
-      @socket.send_string(configuration.to_json)
+    def emit(msg)
+      raw = msg.to_json
+      puts "SENDING #{raw}"
+      @socket.send_string(raw)
     end
 
   end

lib/pipeline/rpc/router.rb

@@ -29,7 +29,7 @@ module Pipeline::Rpc
         test_runners: {
           "*" => 5561,
           "ruby" => 33001,
-          "csharp" => 33002,
+          "csharp" => 33002
         },
         representers: {
           "*" => 5562
@@ -48,11 +48,16 @@ module Pipeline::Rpc
       @notification_socket = NotificationSocket.new(zmq_context, @notification_port)
     end
 
+    def force_worker_restart!
+      @force_restart_at = Time.now
+    end
+
     def run
       Thread.new do
         response_socket.run_heartbeater
       end
 
+
       poller.listen_for_messages do |msg|
         case msg
         when FrontEndRequest
@@ -157,8 +162,9 @@ module Pipeline::Rpc
         action: "configure",
         specs: container_versions
       }
+      m[:force_restart_at] = @force_restart_at.to_i if @force_restart_at
       set_temp_credentials(m)
-      notification_socket.emit_configuration(m)
+      notification_socket.emit(m)
     end
 
     def respond_with_worker_config(req)
@@ -180,14 +186,10 @@ module Pipeline::Rpc
       channel_entry = @backend_channels[channel]
       puts channel_entry.keys
       topics.each do |topic|
-        unless channel_entry.has_key?(topic)
-          puts "RESET #{topic}"
-          topic = "*"
-        end
+        next unless channel_entry.has_key?(topic)
         port = channel_entry[topic].port
         workqueue_addresses << "tcp://#{@public_hostname}:#{port}"
       end
-      workqueue_addresses.uniq!
 
       analyzer_spec[:channel] = {
         channel: channel,

lib/pipeline/rpc/worker/configure_action.rb

@@ -2,27 +2,44 @@ module Pipeline::Rpc::Worker
 
   class ConfigureAction < WorkerAction
 
-    def initialize(channel, request)
+    def initialize(channel, request, topic_scopes)
       @channel = channel
       @request = request
+      @topic_scopes = topic_scopes
     end
 
-    def invoke
+    def invoke      
       spec = request["specs"][@channel]
+      puts "Configuing #{@channel} with #{spec}"
       credentials = parse_credentials(request)
       raise "No spec received" if spec.nil?
       spec.each do |language_slug, versions|
-        puts "Preparing #{language_slug} #{versions}"
-        versions.each do |version|
-          if environment.released?(language_slug, version)
-            puts "Already installed #{language_slug}:#{version}"
-          else
-            puts "Installed #{language_slug}"
-            environment.release(@channel, language_slug, version, credentials)
+        if should_install?(language_slug)
+          puts "Preparing #{language_slug} #{versions}"
+          versions.each do |version|
+            configure(language_slug, version, credentials)
           end
+        else
+          puts "Skipping configuration of #{language_slug}"
         end
       end
     end
+
+    private
+
+    def should_install?(language_slug)
+       @topic_scopes.include?("*") || @topic_scopes.include?(language_slug)
+    end
+
+    def configure(language_slug, version, credentials)
+      if environment.released?(language_slug, version)
+        puts "Already installed #{language_slug}:#{version}"
+      else
+        puts "Installed #{language_slug}"
+        environment.release(@channel, language_slug, version, credentials)
+      end
+    end
+
   end
 
 end

lib/pipeline/rpc/worker/daemon.rb

@@ -1,5 +1,8 @@
 module Pipeline::Rpc::Worker
 
+  class DaemonRestartException < StandardError
+  end
+
   class Daemon
 
     attr_reader :identity, :context, :incoming, :outgoing, :environment
@@ -18,6 +21,7 @@ module Pipeline::Rpc::Worker
         query = CGI::parse(channel_address.query)
         @topics = query["topic"] if query["topic"]
       end
+      @topics = ["*"] if @topics.nil? || @topics.empty?
 
       @context = ZMQ::Context.new(1)
       @incoming = context.socket(ZMQ::PULL)
@@ -26,7 +30,14 @@ module Pipeline::Rpc::Worker
       @environment = Pipeline::Runtime::RuntimeEnvironment.new(env_base)
     end
 
-    def setup
+    def bootstrap_and_listen
+      bootstrap
+      configure
+      connect
+      poll_messages
+    end
+
+    def bootstrap
       @setup = context.socket(ZMQ::REQ)
       @setup.setsockopt(ZMQ::LINGER, 0)
       puts @control_queue
@@ -39,41 +50,48 @@ module Pipeline::Rpc::Worker
       @setup.send_string(request.to_json)
       msg = ""
       @setup.recv_string(msg)
-      msg = JSON.parse(msg)
-      puts "Bootstrap with #{msg}"
-
+      @bootstrap = JSON.parse(msg)
+      puts "Bootstrap with #{JSON.pretty_generate(@bootstrap)}"
       @setup.close
+    end
 
+    def configure
       environment.prepare
-
-      action = Pipeline::Rpc::Worker::ConfigureAction.new(@channel, msg)
+      action = Pipeline::Rpc::Worker::ConfigureAction.new(@channel, @bootstrap, @topics)
       action.environment = environment
       action.invoke
+    end
 
-      response_address = msg["channel"]["response_address"]
-      workqueue_addresses = msg["channel"]["workqueue_addresses"]
-      notification_address = msg["channel"]["notification_address"]
+    def listen
+      connect
+      poll_messages
+    end
+
+    private
+
+    def connect
+      channel_defn = @bootstrap["channel"]
+      response_address = channel_defn["response_address"]
+      workqueue_addresses  =channel_defn["workqueue_addresses"]
+      notification_address = channel_defn["notification_address"]
       @outgoing = context.socket(ZMQ::PUB)
       @outgoing.connect(response_address)
       workqueue_addresses.each do |workqueue_address|
         incoming.connect(workqueue_address)
       end
       @notifications.connect(notification_address)
-    end
-
-    def listen
-      setup
 
       @incoming_wrapper = Pipeline::Rpc::Worker::WorkSocketWrapper.new(incoming)
-      @noificationincoming_wrapper = Pipeline::Rpc::Worker::NotificationSocketWrapper.new(@notifications, @channel)
+      @noificationincoming_wrapper = Pipeline::Rpc::Worker::NotificationSocketWrapper.new(@notifications, @channel, @topics)
 
       @poller = Pipeline::Rpc::ChannelPoller.new
       @poller.register(@incoming_wrapper)
       @poller.register(@noificationincoming_wrapper)
+    end
 
+    def poll_messages
       loop do
         msg = []
-
         @poller.listen_for_messages do |action_task|
           unless action_task.nil?
             action_task.environment = environment
@@ -84,7 +102,6 @@ module Pipeline::Rpc::Worker
             end
           end
         end
-
       end
     end
 

lib/pipeline/rpc/worker/notification_socket_wrapper.rb

@@ -1,11 +1,13 @@
 module Pipeline::Rpc::Worker
   class NotificationSocketWrapper
 
-    attr_reader :socket, :channel
+    attr_reader :socket, :channel, :topic_scopes
 
-    def initialize(socket, channel)
+    def initialize(socket, channel, topic_scopes)
       @socket = socket
       @channel = channel
+      @topic_scopes = topic_scopes
+      @start_at = Time.now.to_i
     end
 
     def recv
@@ -17,11 +19,19 @@ module Pipeline::Rpc::Worker
       action = request["action"]
 
       if action == "configure"
-        a = Pipeline::Rpc::Worker::ConfigureAction.new(channel, request)
+
+        force_restart_at = request["force_restart_at"]
+        if force_restart_at && force_restart_at > @start_at
+          raise DaemonRestartException
+        end
+
+
+        a = Pipeline::Rpc::Worker::ConfigureAction.new(channel, request, topic_scopes)
         a.request = request
         a
       else
         puts "HERE ELSE: #{request}"
+        exit 1
       end
     end