Class: HonestPubsub::Subscriber

Inherits:
Object
  • Object
show all
Defined in:
lib/honest_pubsub/subscriber.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(routing_key, durable = true, topic = "honest") ⇒ Subscriber

Returns a new instance of Subscriber.



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# File 'lib/honest_pubsub/subscriber.rb', line 7

def initialize(routing_key, durable = true, topic="honest")
  @initial_key = routing_key
  @durable = durable
  @topic = topic

  if @initial_key.present?
    @routing_key = "#{@topic}.#{@initial_key}.#"
  else
    @routing_key = "#{@topic}.#"
  end
  @logger = ::HonestPubsub::Logger.new

  self
end

Instance Attribute Details

#channel ⇒ Object (readonly)

Returns the value of attribute channel.



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# File 'lib/honest_pubsub/subscriber.rb', line 5

def channel
  @channel
end

#exchange ⇒ Object (readonly)

Returns the value of attribute exchange.



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# File 'lib/honest_pubsub/subscriber.rb', line 4

def exchange
  @exchange
end

#listener ⇒ Object (readonly)

Returns the value of attribute listener.



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# File 'lib/honest_pubsub/subscriber.rb', line 3

def listener
  @listener
end

Instance Method Details

#start(name, blocking = false) ⇒ Object

name - used to ensure that certain consumers are actually listening to an exchange pass in a lambda for this method to work. We might only want to expose the content instead of all 3 chunks.



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# File 'lib/honest_pubsub/subscriber.rb', line 25

def start(name, blocking=false)
  @connection = Bunny.new(Configuration.configuration[:connection])
  begin
    @connection.start
  rescue => e
    Airbrake.notify("RabbitMQ unreachable!", params: { message: e.message}, environment_name: ENV['RAILS_ENV'] )
    raise e
  end

  @channel = @connection.create_channel
  @exchange = @channel.topic(@topic, :durable=>@durable, :auto_delete=>false)

  # FIX!!! -thl
  # Need to ensure that the ids for a server will be reproducible in case a server
  # goes down and has to get restarted.
  if @initial_key.present?
    @queue = "#{@initial_key}.#{name}"
  else
    @queue = "#{name}"
  end

  queue_arguments = {}
  queue_arguments["x-dead-letter-exchange"] = Configuration.configuration[:dead_letter] if Configuration.configuration[:dead_letter].present?
  @listener = @channel.queue(@queue, :arguments=>queue_arguments ).bind(@exchange, :routing_key => @routing_key, :exclusive=>false)
  # Parameters for subscribe that might be useful:
  # :block=>true - Used for long running consumer applications.  (backend servers?)
  @consumer = @listener.subscribe(:consumer_tag=>name, :block=>blocking)
  @consumer.on_delivery do |delivery_info, properties, contents|
    HonestPubsub.logger.debug( "Message delivery with contents: #{contents}")
    if delivery_info[:redelivered]
      Airbrake.notify("PubSub Message redelivery", params: {info: delivery_info, props: properties, contents: contents}, environment_name: ENV['RAILS_ENV'] )
    end
    message = ::HonestPubsub::Message.new.parse(contents)
    @logger.log_receive(delivery_info[:routing_key], message)
    yield delivery_info, properties, message
    true
  end
end

#teardown ⇒ Object 



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# File 'lib/honest_pubsub/subscriber.rb', line 64

def teardown
  @consumer.cancel if @consumer.present?
  @connection.close if @connection.present?
end