Class: Watership::Consumer

Inherits:
Object
  • Object
show all
Defined in:
lib/watership/consumer.rb

Instance Method Summary collapse

Constructor Details

#initialize(consumer, url, channel_options = {}, queue_options = {}) ⇒ Consumer

Returns a new instance of Consumer.



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# File 'lib/watership/consumer.rb', line 5

def initialize(consumer, url, channel_options = {}, queue_options = {})
  @consumer = consumer
  @url = url
  @prefetch = channel_options.delete(:prefetch) || Integer(ENV.fetch("RABBIT_CONSUMER_PREFETCH", 200))
  @channel_opts = {durable: true}.merge(channel_options)
  @queue_opts = {block: true, ack: true}.merge(queue_options)
end

Instance Method Details

#consume ⇒ Object 



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# File 'lib/watership/consumer.rb', line 13

def consume
  Thread.abort_on_exception = true
  begin
    queue.subscribe(@queue_opts) do |delivery_info, properties, payload|
      success = false
      begin
        @consumer.call(JSON.parse(payload))
        success = true
      rescue StandardError => exception
        logger.error "Error thrown in subscribe block"
        logger.error exception.message
        logger.error exception.backtrace.join("\n")
        Airbrake.notify(exception) if defined?(AirBrake)
        logger.info "Rejecting in rabbit"
        throw(:terminate)
      rescue Interrupt => exception
        logger.error "Interrupt in subscribe block"
        logger.warn "Stopped gracefully."
        throw(:terminate)
      ensure
        if success
          logger.info "Acking message"
          channel.acknowledge(delivery_info.delivery_tag, false)
        else
          logger.info "Rejecting message"
          channel.reject(delivery_info.delivery_tag, true)
        end
      end
    end
  ensure
    logger.info "Closing Channel"
    channel.close
  end
end