Update ruby tutorial one

ruby/receive.rb

@@ -1,21 +1,19 @@
 #!/usr/bin/env ruby
-# encoding: utf-8
+require 'bunny'
 
-require "bunny"
+connection = Bunny.new(automatically_recover: false)
+connection.start
 
-conn = Bunny.new(:automatically_recover => false)
-conn.start
-
-ch   = conn.create_channel
-q    = ch.queue("hello")
+channel = connection.create_channel
+queue = channel.queue('hello')
 
 begin
-  puts " [*] Waiting for messages. To exit press CTRL+C"
-  q.subscribe(:block => true) do |delivery_info, properties, body|
+  puts ' [*] Waiting for messages. To exit press CTRL+C'
+  queue.subscribe(block: true) do |_delivery_info, _properties, body|
     puts " [x] Received #{body}"
   end
 rescue Interrupt => _
-  conn.close
+  connection.close
 
   exit(0)
 end

ruby/send.rb

@@ -1,15 +1,13 @@
 #!/usr/bin/env ruby
-# encoding: utf-8
+require 'bunny'
 
-require "bunny"
+connection = Bunny.new(automatically_recover: false)
+connection.start
 
-conn = Bunny.new(:automatically_recover => false)
-conn.start
+channel = connection.create_channel
+queue = channel.queue('hello')
 
-ch   = conn.create_channel
-q    = ch.queue("hello")
-
-ch.default_exchange.publish("Hello World!", :routing_key => q.name)
+channel.default_exchange.publish('Hello World!', routing_key: queue.name)
 puts " [x] Sent 'Hello World!'"
 
-conn.close
+connection.close

ruby/worker.rb

@@ -1,25 +1,23 @@
 #!/usr/bin/env ruby
-# encoding: utf-8
+require 'bunny'
 
-require "bunny"
+connection = Bunny.new(automatically_recover: false)
+connection.start
 
-conn = Bunny.new(:automatically_recover => false)
-conn.start
+channel = connection.create_channel
+queue = channel.queue('task_queue', durable: true)
 
-ch   = conn.create_channel
-q    = ch.queue("task_queue", :durable => true)
-
-ch.prefetch(1)
-puts " [*] Waiting for messages. To exit press CTRL+C"
+channel.prefetch(1)
+puts ' [*] Waiting for messages. To exit press CTRL+C'
 
 begin
-  q.subscribe(:manual_ack => true, :block => true) do |delivery_info, properties, body|
+  queue.subscribe(manual_ack: true, block: true) do |delivery_info, _properties, body|
     puts " [x] Received '#{body}'"
     # imitate some work
-    sleep body.count(".").to_i
-    puts " [x] Done"
-    ch.ack(delivery_info.delivery_tag)
+    sleep body.count('.').to_i
+    puts ' [x] Done'
+    channel.ack(delivery_info.delivery_tag)
   end
 rescue Interrupt => _
-  conn.close
+  connection.close
 end