Class: Slnky::Service::Base

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

Instance Method Summary collapse

Constructor Details

#initialize(url, env = 'development') ⇒ Base

Returns a new instance of Base.



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# File 'lib/slnky/service.rb', line 10

def initialize(url, env='development')
  @server = url
  @environment = env
  @name = self.class.name.split('::').last.downcase
  json = open("#{@server}/configs/#{@name}") {|f| f.read }
  @config = JSON.parse(json)
  @host = @config['rabbit']['host']
  @port = @config['rabbit']['port']
  @subscriptions = {}
  @periodics = []
  @exchanges = {}
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/slnky/service.rb', line 23

def start
  AMQP.start("amqp://#{@host}:#{@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['events'] = @channel.fanout("slnky.events")
    @exchanges['logs'] = @channel.fanout("slnky.logs")

    log :info, "slnky.service.#{@name}: running"

    run

    @subscriptions.each do |name, block|
      log :info, "slnky.service.#{@name}: subscribed to: #{name}"
    end

    @channel.queue("service.#{@name}.events", durable: true).bind(@exchanges['events']).subscribe do |raw|
      payload = parse(raw)
      if @subscriptions[payload.name]
        @subscriptions[payload.name].call(payload)
      end
      # TODO: support this better
      if @subscriptions['*']
        @subscriptions['*'].call(payload)
      end
    end

    @periodics.each do |p|
      EventMachine.add_periodic_timer(p[:timer]) do
        b = p[:block]
        instance_eval &b
      end
    end

    stopper = Proc.new do
      puts 'stopping'
      # TODO: log :warn, "slnky.service.#{@name}: stopping"
      connection.close { EventMachine.stop }
    end

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