Class: Tina4::WebSocket

Inherits:
Object
  • Object
show all
Defined in:
lib/tina4/websocket.rb

Constant Summary collapse

GUID = 
"258EAFA5-E914-47DA-95CA-5AB5DC11AD37"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ WebSocket

Returns a new instance of WebSocket.



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# File 'lib/tina4/websocket.rb', line 13

def initialize
  @connections = {}
  @handlers = {
    open: [],
    message: [],
    close: [],
    error: []
  }
  @rooms = {}  # room_name => Set of conn_ids
end

Instance Attribute Details

#connections ⇒ Object (readonly)

Returns the value of attribute connections.



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# File 'lib/tina4/websocket.rb', line 11

def connections
  @connections
end

Instance Method Details

#broadcast(message, exclude: nil, path: nil) ⇒ Object 



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# File 'lib/tina4/websocket.rb', line 81

def broadcast(message, exclude: nil, path: nil)
  @connections.each do |id, conn|
    next if exclude && id == exclude
    next if path && conn.path != path
    conn.send_text(message)
  end
end

#broadcast_to_room(room_name, message, exclude: nil) ⇒ Object 



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# File 'lib/tina4/websocket.rb', line 109

def broadcast_to_room(room_name, message, exclude: nil)
  (get_room_connections(room_name)).each do |conn|
    next if exclude && conn.id == exclude
    conn.send_text(message)
  end
end

#get_room_connections(room_name) ⇒ Object 



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# File 'lib/tina4/websocket.rb', line 104

def get_room_connections(room_name)
  ids = @rooms[room_name] || Set.new
  ids.filter_map { |id| @connections[id] }
end

#handle_upgrade(env, socket) ⇒ Object 



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# File 'lib/tina4/websocket.rb', line 33

def handle_upgrade(env, socket)
  key = env["HTTP_SEC_WEBSOCKET_KEY"]
  return unless key

  accept = Base64.strict_encode64(
    Digest::SHA1.digest("#{key}#{GUID}")
  )

  response = "HTTP/1.1 101 Switching Protocols\r\n" \
             "Upgrade: websocket\r\n" \
             "Connection: Upgrade\r\n" \
             "Sec-WebSocket-Accept: #{accept}\r\n\r\n"

  socket.write(response)

  conn_id = SecureRandom.hex(16)
  ws_path = env["REQUEST_PATH"] || env["PATH_INFO"] || "/"
  connection = WebSocketConnection.new(conn_id, socket, ws_server: self, path: ws_path)
  @connections[conn_id] = connection

  emit(:open, connection)

  Thread.new do
    begin
      loop do
        frame = connection.read_frame
        break unless frame

        case frame[:opcode]
        when 0x1 # Text
          emit(:message, connection, frame[:data])
        when 0x8 # Close
          break
        when 0x9 # Ping
          connection.send_pong(frame[:data])
        end
      end
    rescue => e
      emit(:error, connection, e)
    ensure
      @connections.delete(conn_id)
      remove_from_all_rooms(conn_id)
      emit(:close, connection)
      socket.close rescue nil
    end
  end
end

#join_room_for(conn_id, room_name) ⇒ Object

── Rooms ──────────────────────────────────────────────────



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# File 'lib/tina4/websocket.rb', line 91

def join_room_for(conn_id, room_name)
  @rooms[room_name] ||= Set.new
  @rooms[room_name].add(conn_id)
end

#leave_room_for(conn_id, room_name) ⇒ Object 



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# File 'lib/tina4/websocket.rb', line 96

def leave_room_for(conn_id, room_name)
  @rooms[room_name]&.delete(conn_id)
end

#on(event, &block) ⇒ Object 



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# File 'lib/tina4/websocket.rb', line 24

def on(event, &block)
  @handlers[event.to_sym] << block if @handlers.key?(event.to_sym)
end

#room_count(room_name) ⇒ Object 



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# File 'lib/tina4/websocket.rb', line 100

def room_count(room_name)
  (@rooms[room_name] || Set.new).size
end

#upgrade?(env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tina4/websocket.rb', line 28

def upgrade?(env)
  upgrade = env["HTTP_UPGRADE"] || ""
  upgrade.downcase == "websocket"
end