Class: Rubee::WebSocket

Inherits:
Object
  • Object
show all
Defined in:
lib/rubee/websocket/websocket.rb

Class Method Summary collapse

Class Method Details

.call(env, &controller_block) ⇒ Object 



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# File 'lib/rubee/websocket/websocket.rb', line 12

def call(env, &controller_block)
  unless env['rack.hijack']
    return [500, { 'Content-Type' => 'text/plain' }, ['Hijack not supported']]
  end

  env['rack.hijack'].call
  io = env['rack.hijack_io']

  handshake = ::WebSocket::Handshake::Server.new
  handshake.from_rack(env)
  unless handshake.valid?
    io.write("HTTP/1.1 400 Bad Request\r\n\r\n")
    io.close
    return [-1, {}, []]
  end

  io.write(handshake.to_s)
  incoming = ::WebSocket::Frame::Incoming::Server.new(version: handshake.version)

  outgoing = ->(data) do
    frame = ::WebSocket::Frame::Outgoing::Server.new(
      version: handshake.version,
      type: :text,
      data: data.to_json
    )
    io.write(frame.to_s)
  rescue IOError
    nil
  end

  # --- Listen to incoming data ---
  Thread.new do
    loop do
      data = io.readpartial(1024)
      incoming << data

      while (frame = incoming.next)
        case frame.type
        when :text
          out = controller_out(frame, outgoing, &controller_block)
          outgoing.call(**out)

        when :close
          # Client closed connection
          handle_close(frame, io, handshake)
          break
        end
      end
    end
  rescue EOFError, IOError
    begin
      handle_close(frame, io, handshake)
    rescue
      nil
    end
  end

  [101, handshake.headers, []]
end

.controller_out(frame, io, &block) ⇒ Object 



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# File 'lib/rubee/websocket/websocket.rb', line 90

def controller_out(frame, io, &block)
  payload_hash = payload(frame)
  action  = payload_hash["action"]
  channel = payload_hash["channel"]
  message = payload_hash["message"]
  options = payload_hash.select { |k, _| !["action", "channel", "message"].include?(k) }
  options.merge!(io:)

  block.call(channel:, message:, action:, options:)
end

.handle_close(frame, io, handshake) ⇒ Object 



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# File 'lib/rubee/websocket/websocket.rb', line 78

def handle_close(frame, io, handshake)
  payload_hash = payload(frame)
  channel = payload_hash["channel"]
  subcriber = payload_hash["subcriber"]
  ::Rubee::WebSocketConnections.instance.remove("#{channel}:#{subcriber}", io)
  io.write(::WebSocket::Frame::Outgoing::Server.new(
    version: handshake.version,
    type: :close
  ).to_s)
  io.close
end

.payload(frame) ⇒ Object 



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# File 'lib/rubee/websocket/websocket.rb', line 72

def payload(frame)
  JSON.parse(frame.data)
rescue
  {}
end