Timeout Issue When Publishing Messages to RabbitMQ Queue in Ruby on Rails Using Bunny Gem

rubyonrails-talk
1

I’m facing a timeout issue when attempting to publish messages to a RabbitMQ queue in my Ruby on Rails application. I’m using the Bunny gem for connection and message publishing. The connection to RabbitMQ is successfully established, but when I try to publish a message, it times out. Interestingly, running the same publishing code directly through Rails Console works perfectly.

Here’s the setup for my connection initializer:

# config/initializers/rabbitmq.rb
require 'bunny'

unless Rails.env.test?
  RABBITMQ_CONN = Bunny.new(
    host: ENV['RABBITMQ_HOST'] || 'localhost',
    port: ENV['RABBITMQ_PORT'] || 5672,
    username: ENV['RABBITMQ_USER'] || 'guest',
    password: ENV['RABBITMQ_PASSWORD'] || 'guest'
  )

  RABBITMQ_CONN.start
end

And here is the service responsible for publishing messages:

# app/service/rabbitmq/point_calculations_publisher.rb
class Rabbitmq::PointCalculationsPublisher
  def self.publish(message)
    channel = RABBITMQ_CONN.create_channel
    queue = channel.queue('point_calculations', durable: true)
    queue.publish(message.to_json, persistent: true)
  ensure
    channel&.close
  end
end

Environment Details: Ruby version: 2.5.6 Rails version: 5.2 Bunny gem version: 2.19 Troubleshooting Steps Taken: Verified that the connection works, as I can successfully connect. Tested publishing through Rails Console, which works as expected without timeouts. Additional Context: The timeout occurs only when publishing within the Rails application itself. I suspect it might be related to how the Bunny connection is being handled in production vs. Rails Console.

Any insights or solutions from those who have encountered similar issues would be highly appreciated!

3

**second try How you’re publishing is valid, but not a common pattern. Obviously I don’t know your use case, but why would you need to publish to the queue directly? Seeing that your queue is durable, you might as well create it be hand, and publish to it via the topic exchange. It’s difficult to assume what the problem is without the actual error and stack trace but I have a feeling it might be with the channel dealing with the queue over and over, if that code executed often.