Class: Slnky::Transport::Rabbit

Inherits:
Object
  • Object
show all
Defined in:
lib/slnky/transport.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Rabbit

attr_reader :queues



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# File 'lib/slnky/transport.rb', line 18

def initialize
  @config = Slnky.config
  @host = @config.rabbit.host
  @port = @config.rabbit.port
  @user = @config.rabbit.user
  @pass = @config.rabbit.pass
  userpass = @user ? "#{@user}:#{@pass}@" : ""
  @url = "amqp://#{userpass}#{@host}:#{@port}"
  @channel = nil
  @exchanges = {}
  @queues = {}
end

Instance Attribute Details

#channel ⇒ Object (readonly)

Returns the value of attribute channel.



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# File 'lib/slnky/transport.rb', line 14

def channel
  @channel
end

#exchanges ⇒ Object (readonly)

Returns the value of attribute exchanges.



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# File 'lib/slnky/transport.rb', line 15

def exchanges
  @exchanges
end

Instance Method Details

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/slnky/transport.rb', line 71

def connected?
  @channel != nil
end

#exchange(desc, type) ⇒ Object 



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# File 'lib/slnky/transport.rb', line 75

def exchange(desc, type)
  raise 'attempting to create exchange without channel' unless @channel
  name = "slnky.#{desc}"
  @exchanges[desc] =
      case type
        when :fanout
          @channel.fanout(name)
        when :direct
          @channel.direct(name)
        else
          raise "unknown exchange type: #{ex.type}"
      end
end

#queue(desc, exchange = 'events', options = {}) ⇒ Object 



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# File 'lib/slnky/transport.rb', line 89

def queue(desc, exchange='events', options={})
  raise 'attempting to create queue without channel' unless @channel
  name = "service.#{desc}.#{exchange}"
  @queues[name] ||= begin
    options = {
        durable: true
    }.merge(options)
    routing = options.delete(:routing_key)
    bindoptions = routing ? {routing_key: routing} : {}
    @channel.queue(name, options).bind(@exchanges[exchange], bindoptions)
  end
end

#start!(service, &block) ⇒ Object 



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# File 'lib/slnky/transport.rb', line 31

def start!(service, &block)
  AMQP.start(@url) do |connection|
    @connection = connection
    @channel = AMQP::Channel.new(@connection)
    @channel.on_error do |ch, channel_close|
      raise "Channel-level exception: #{channel_close.reply_text}"
    end

    Signal.trap("INT", proc { self.stop!('Interrupted') })
    Signal.trap("TERM", proc { self.stop!('Terminated') })

    exchange('events', :fanout)
    exchange('logs', :fanout)
    exchange('response', :direct)

    yield self if block_given?

    if service.is_a?(Slnky::Service::Base)
      queue(service.name, 'events').subscribe do |raw|
        event = Slnky::Message.parse(raw)
        service.subscriber.for(event.name) do |name, method|
          service.send(method.to_sym, event.name, event.payload)
        end
      end

      service.timers.each do |seconds, method|
        EventMachine.add_periodic_timer(seconds) do
          service.send(method.to_sym)
        end
      end
    end
  end
end

#stop!(msg = nil) ⇒ Object 



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# File 'lib/slnky/transport.rb', line 65

def stop!(msg=nil)
  return unless @connection
  puts "#{Time.now}: stopping (#{msg})" if msg
  @connection.close { EventMachine.stop { exit } }
end