Class: Slnky::Service::Base

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

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(url, options = {}) ⇒ Base

Returns a new instance of Base.



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

def initialize(url, options={})
  @server = url
  @name = self.class.name.split('::').last.downcase
  @environment = options.delete(:env) || options.delete(:environment) || 'development'
  @config = load_config(options)

  @subscriptions = self.class.subscriptions || Slnky::Service::Subscriptions.new
  @periodics = self.class.periodics || Slnky::Service::Periodics.new
  @hostname = Socket.gethostname
  @ipaddress = Socket.ip_address_list.find { |ai| ai.ipv4? && !ai.ipv4_loopback? }.ip_address
end

Class Attribute Details

.periodics ⇒ Object (readonly)

Returns the value of attribute periodics.



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# File 'lib/slnky/service.rb', line 135

def periodics
  @periodics
end

.subscriptions ⇒ Object (readonly)

Returns the value of attribute subscriptions.



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# File 'lib/slnky/service.rb', line 134

def subscriptions
  @subscriptions
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/slnky/service.rb', line 16

def config
  @config
end

Class Method Details

.periodic(seconds, method) ⇒ Object Also known as: timer 



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# File 'lib/slnky/service.rb', line 142

def periodic(seconds, method)
  @periodics ||= Slnky::Service::Periodics.new
  @periodics.add(seconds, method)
end

.subscribe(name, method) ⇒ Object 



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# File 'lib/slnky/service.rb', line 137

def subscribe(name, method)
  @subscriptions ||= Slnky::Service::Subscriptions.new
  @subscriptions.add(name, method)
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/slnky/service.rb', line 30

def start
  AMQP.start("amqp://#{config.rabbit.host}:#{config.rabbit.port}") do |connection|
    @channel = AMQP::Channel.new(connection)
    @channel.on_error do |ch, channel_close|
      raise "Channel-level exception: #{channel_close.reply_text}"
    end

    @exchanges = Slnky::Service::Exchanges.new(@channel)
    @exchanges.create('events')
    @exchanges.create('logs')

    @queues = Slnky::Service::Queues.new(@channel)
    @queues.create(@name, @exchanges['events'])

    stopper = Proc.new do
      puts "#{Time.now}: stopping"
      connection.close { EventMachine.stop }
    end

    Signal.trap("INT", stopper)
    Signal.trap("TERM", stopper)

    log :info, "running"

    run

    @subscriptions.each do |name, method|
      log :info, "subscribed to: #{name} -> #{self.class.name}.#{method}"
    end

    @queues[@name].subscribe do |raw|
      message = parse(raw)
      event = message.name
      data = message.payload
      @subscriptions.for(event) do |name, method|
        self.send(method.to_sym, event, data)
      end
      if event == 'slnky.service.restart'
        # if we get this event, just stop. upstart will start us again.
        log :warn, "received restart event"
        stopper.call
      end
    end

    @periodics.each do |seconds, method|
      EventMachine.add_periodic_timer(seconds) do
        self.send(method.to_sym)
      end
    end
  end
end