Class: Franz::Output::RabbitMQ

Inherits:
Object
  • Object
show all
Defined in:
lib/franz/output/rabbitmq.rb

Overview

RabbitMQ output for Franz. You must declare an x-consistent-hash type exchange, as we generate random Integers for routing keys.

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ RabbitMQ

Start a new output in the background. We’ll consume from the input queue and ship events to the configured RabbitMQ cluster.

Parameters:

  • opts (Hash) (defaults to: {}) —

    options for the output

Options Hash (opts):

  • :input (Queue) — default: [] —

    “input” queue

  • :output (Hash) — default: {} —

    “output” configuration



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# File 'lib/franz/output/rabbitmq.rb', line 20

def initialize opts={}
  opts = {
    logger: Logger.new(STDOUT),
    tags: [],
    input: [],
    output: {
      exchange: {
        name: 'test',
        durable: true
      },
      connection: {
        host: 'localhost',
        port: 5672
      }
    }
  }.deep_merge!(opts)

  @statz = opts[:statz] || Franz::Stats.new
  @statz.create :num_output, 0

  @logger = opts[:logger]

  rabbit = Bunny.new opts[:output][:connection].merge({
    network_recovery_interval: 10.0,
    continuation_timeout: 10_000,
    threaded: false,
    logger: @logger
  })

  rabbit.start

  channel  = rabbit.create_channel
  exchange = opts[:output][:exchange].delete(:name)
  exchange = channel.exchange exchange, \
    { type: 'x-consistent-hash' }.merge(opts[:output][:exchange])

  @stop = false
  @foreground = opts[:foreground]

  @thread = Thread.new do
    rand = Random.new
    until @stop
      event = opts[:input].shift

      unless opts[:tags].empty?
        event['tags'] ||= []
        event['tags']  += opts[:tags]
      end

      log.debug \
        event: 'publish',
        raw: event

      exchange.publish \
        JSON::generate(event),
        routing_key: rand.rand(10_000),
        persistent: false

      @statz.inc :num_output
    end
  end

  log.info event: 'output started'

  @thread.join if @foreground
end

Instance Method Details

#join ⇒ Object

Join the Output thread. Effectively only once.



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# File 'lib/franz/output/rabbitmq.rb', line 88

def join
  return if @foreground
  @foreground = true
  @thread.join
end

#stop ⇒ Object

Stop the Output thread. Effectively only once.



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# File 'lib/franz/output/rabbitmq.rb', line 95

def stop
  return if @foreground
  @foreground = true
  @thread.kill
  log.info event: 'output stopped'
end