basic proxy and consumer done

consumer/bettermail_consumer.rb

@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require 'dotenv/load'
+require 'pg'
+require 'mail'
+require 'bunny'
+
+# Server class
+class BettermailConsumer
+  def initialize
+    @pg = PG::Connection.new(ENV['DATABASE_URL'])
+  end
+
+  def start
+    begin
+      puts ' [*] Waiting for messages. To exit press CTRL+C'
+      mail_queue = bunny_channel.queue(ENV['RABBIT_MAIL_QUEUE'])
+      mail_queue.subscribe(block: true) do |_delivery_info, _properties, body|
+        mail = Mail.read_from_string(body)
+        puts mail
+      end
+      sns_queue = bunny_channel.queue(ENV['RABBIT_SNS_QUEUE'])
+      sns_queue.subscribe(block: true) do |_delivery_info, _properties, body|
+        puts " [x] Received #{_delivery_info}"
+      end
+    rescue Interrupt => _
+      stop
+    end
+
+  end
+
+  def stop
+    @bunny_conn&.close
+    @pg&.close
+  end
+
+  def bunny_channel
+    if @bunny_channel.nil?
+      @bunny_conn = Bunny.new
+      @bunny_conn.start
+      @bunny_channel = @bunny_conn.create_channel
+    end
+    @bunny_channel
+  end
+end
+
+service_name='BetterMail::Consumer'
+# Create a new server instance for listening at localhost interfaces 127.0.0.1:2525
+# and accepting a maximum of 4 simultaneous connections per default
+service = BettermailConsumer.new
+
+# save flag for Ctrl-C pressed
+flag_status_ctrl_c_pressed = false
+
+# try to gracefully shutdown on Ctrl-C
+trap('INT') do
+  # print an empty line right after ^C
+  puts
+  # notify flag about Ctrl-C was pressed
+  flag_status_ctrl_c_pressed = true
+  # signal exit to app
+  exit 0
+end
+
+# Output for debug
+puts("Starting #{service_name}")
+
+# setup exit code
+at_exit do
+  # check to shutdown connection
+  if service
+    # Output for debug
+    puts('Ctrl-C interrupted, exit now...') if flag_status_ctrl_c_pressed
+    # info about shutdown
+    puts("Shutdown #{service_name}...")
+    # stop all threads and connections gracefully
+    service.stop
+  end
+
+  # Output for debug
+  puts "#{service_name} stopped!"
+end
+
+# Start the server
+service.start
+
+# Run on server forever
+service.join