RabbitMQ : Use on Ruby2021/06/21

	This is an example to use RabbitMQ on Ruby.
[1]	Install required packages.

[root@dlp ~]#

dnf -y install ruby-devel rpm-build gcc make

[2]	This is an example of sending message on Ruby. For example, connect with RabbitMQ on [localhost] with a user [serverworld], virtualhost [my_vhost].

[cent@dlp ~]$

gem install bunny

[cent@dlp ~]$

vi send_msg.rb

require "bunny"

connection = Bunny.new(
    :hostname => "127.0.0.1",
    :port => 5672,
    :vhost => "/my_vhost",
    :user => "serverworld",
    :pass => "password",
)
connection.start

channel = connection.create_channel

q = channel.queue("Hello_World")
channel.default_exchange.publish("Hello RabbitMQ World!", :routing_key => q.name)
puts " [x] Sent 'Hello RabbitMQ World!'"

connection.close

[cent@dlp ~]$

ruby send_msg.rb

 [x] Sent 'Hello RabbitMQ World!'

[3]	This is an example of receiving message on Ruby.

[cent@node01 ~]$

gem install bunny

[cent@node01 ~]$

vi receive_msg.rb

require "bunny"

Signal.trap(:INT){
    puts "Exited from receiving queues."
    exit(0)
}

connection = Bunny.new(
    :hostname => "10.0.0.30",
    :port => 5672,
    :vhost => "/my_vhost",
    :user => "serverworld",
    :pass => "password",
)
connection.start

channel = connection.create_channel
q = channel.queue("Hello_World")

puts " [*] Waiting for messages in #{q.name}. To exit press CTRL+C"
q.subscribe(:block => true) do |delivery_info, properties, body|
    puts " [x] Received #{body}"

    delivery_info.consumer.cancel
end

[cent@node01 ~]$

ruby receive_msg.rb

 [*] Waiting for messages in Hello_World. To exit press CTRL+C
 [x] Received Hello RabbitMQ World!

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