Class: RubyPitaya::NatsConnector

Inherits:
Object
  • Object
show all
Defined in:
lib/rubypitaya/core/nats_connector.rb

Constant Summary collapse

REQUEST_TYPE_SYS = 
0
REQUEST_TYPE_USER = 
1
MESSAGE_TYPE_REQUEST = 
0
MESSAGE_TYPE_NOTIFY = 
1
MESSAGE_TYPE_RESPONSE = 
2
MESSAGE_TYPE_PUSH = 
3

Instance Method Summary collapse

Constructor Details

#initialize(nats_address, server_uuid, server_name, n_threads, log) ⇒ NatsConnector

Returns a new instance of NatsConnector.



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# File 'lib/rubypitaya/core/nats_connector.rb', line 18

def initialize(nats_address, server_uuid, server_name, n_threads, log)
  @nats_address = nats_address
  @server_uuid = server_uuid
  @server_name = server_name
  @n_threads = n_threads
  @log = log
  @nats = nil
  @subscribe = nil
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/rubypitaya/core/nats_connector.rb', line 28

def connect
  self.disconnect

  @nats = NATS.connect(servers: [@nats_address])
  @subscribe = @nats.subscribe(subscribe_topic)

  @queue = Thread::Queue.new
  @threads = []

  @n_threads.times do |i|
    @threads << Thread.new do
      loop do
        data, reply = @queue.pop

        request = NatsRequest.decode(data).to_h

        response = yield request

        nats_response = NatsResponse.new(data: response.force_encoding('ascii-8bit'))
        nats_response_encoded = NatsResponse.encode(nats_response)

        @nats.publish(reply, nats_response_encoded)

      rescue Exception => error
        @log.error "NATS ERROR: #{error.message}} \n #{error.backtrace.join("\n")}"
      end
    end
  end

  loop do
    message = @subscribe.pending_queue.pop
    @subscribe.synchronize do
      @subscribe.pending_size -= message.data.size
    end

    @queue << [message.data, message.reply]
  end
end

#disconnect ⇒ Object 



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# File 'lib/rubypitaya/core/nats_connector.rb', line 67

def disconnect
  @threads.map(&:kill) unless @threads.nil?
  @queue.close unless @queue.nil?
  @subscribe.unsubscribe unless @subscribe.nil?
  @nats.close unless @nats.nil?

  @threads = nil
  @queue = nil
  @subscribe = nil
  @nats = nil
end

#get_frontend_topic(frontend_id) ⇒ Object 



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# File 'lib/rubypitaya/core/nats_connector.rb', line 130

def get_frontend_topic(frontend_id)
  "pitaya/servers/connector/#{frontend_id}"
end

#get_user_message_topic(uid) ⇒ Object 



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# File 'lib/rubypitaya/core/nats_connector.rb', line 134

def get_user_message_topic(uid)
  "pitaya/connector/user/#{uid}/push"
end

#push_to_frontend(session, message_route, payload) ⇒ Object 



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# File 'lib/rubypitaya/core/nats_connector.rb', line 79

def push_to_frontend(session, message_route, payload)
  frontend_topic = get_frontend_topic(session.frontend_id)

  nats_message = NatsMessage.new(
    route: message_route,
    data: payload,
    reply: @server_uuid,
    type: MESSAGE_TYPE_REQUEST,
  )

  nats_session = NatsSession.new(
    id: session.id,
    uid: session.uid.to_s,
    data: session.data.to_json,
  )

  nats_request = NatsRequest.new(
    type: REQUEST_TYPE_USER,
    session: nats_session,
    msg: nats_message,
    frontendID: session.frontend_id,
    metadata: session.metadata.to_json,
  )

  request = NatsRequest.encode(nats_request)

  nats_response = @nats.request(frontend_topic, request)

  response = NatsResponse.decode(nats_response.data).to_h

  response
end

#push_to_user(uid, message_route, payload) ⇒ Object 



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# File 'lib/rubypitaya/core/nats_connector.rb', line 112

def push_to_user(uid, message_route, payload)
  user_topic = get_user_message_topic(uid)

  nats_push = NatsPush.new(
    route: message_route,
    uid: uid,
    data: payload.to_json,
  )

  @nats.publish(user_topic, nats_push)

  0
end

#subscribe_topic ⇒ Object 



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# File 'lib/rubypitaya/core/nats_connector.rb', line 126

def subscribe_topic
  "pitaya/servers/#{@server_name}/#{@server_uuid}"
end