Module: Cargosocket::Stream

Defined in:
lib/cargosocket/stream.rb

Constant Summary collapse

WS_OPT_KEYS = 
%w{host port debug secure secure_proxy tls_options
close_timeout outbound_limit}.map(&:to_sym)

Class Method Summary collapse

Class Method Details

.call(cargoenv) ⇒ Object 



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# File 'lib/cargosocket/stream.rb', line 7

def self.call(cargoenv)
  raise "requires stream adapter" unless cargoenv[:adapter]

  EM.run do
    ws_config = WS_OPT_KEYS.reduce({}) do |acc, key|
      acc[key] = cargoenv[key] if cargoenv.has_key?(key)
      next acc
    end
    EM::WebSocket.run(ws_config){ |ws| config_socket(cargoenv, ws) }
  end
end

.config_socket(cargoenv, ws) ⇒ Object 



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# File 'lib/cargosocket/stream.rb', line 19

def self.config_socket(cargoenv, ws)
  ws.onopen do |w|
    path = w.path.sub(/^\//, '')
    periodic_ping(cargoenv, ws)
    EM.add_timer(0.5){ setup_connection(cargoenv, ws, path, w.query) }
  end
end

.periodic_ping(cargoenv, ws) ⇒ Object 



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# File 'lib/cargosocket/stream.rb', line 27

def self.periodic_ping(cargoenv, ws)
  EM.add_periodic_timer(cargoenv[:ping_timer] || 5){ ws.ping }
end

.setup_connection(cargoenv, ws, path, query) ⇒ Object 



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# File 'lib/cargosocket/stream.rb', line 31

def self.setup_connection(cargoenv, ws, path, query)
  cb_adapter = StreamAdapters::CargobullAdapter

  channels = cb_adapter.channels(cargoenv, path, query)
  ref = cb_adapter.reference(cargoenv, path, query)
  if channels && ref
    state = cargoenv[:adapter].subscribe(*channels) do |channel, message|
      cb_adapter.pop(cargoenv, path, ref, channel, message,
        &ws.method(:send))
    end

    state.keys.each do |channel|
      cb_adapter.subscribe(cargoenv, path, ref, channel) do |v|
        cargoenv[:adapter].push(channel, v)
      end
    end

    ws.onmessage do |message|
      state.keys.each do |channel|
        cb_adapter.push(cargoenv, path, ref, channel,
          message.strip){ |v| cargoenv[:adapter].push(channel, v) }
      end
    end

    ws.onerror do |error|
      cargoenv[:adapter].unsubscribe(state) do |channel|
        cb_adapter.error(cargoenv, path, ref, channel) do |v|
          cargoenv[:adapter].push(channel, v)
        end
      end
    end

    ws.onclose do
      cargoenv[:adapter].unsubscribe(state) do |channel|
        cb_adapter.unsubscribe(cargoenv, path, ref, channel) do |v|
          cargoenv[:adapter].push(channel, v)
        end
      end
    end
  else
    ws.close(3001, channels.inspect || ref.to_s || "unknown")
  end
end