RelayConnection = ref object of Connection
  conn*: Connection
  limitDuration*: uint32
  limitData*: uint64
  dataSent*: uint64

proc new(T: typedesc[RelayConnection]; conn: Connection; limitDuration: uint32;
         limitData: uint64): T:type {....raises: [].}

method closeImpl(self: RelayConnection): Future[void] {.async: (...raises: []),
    ...raises: [], tags: [].}

method getWrapped(self: RelayConnection): Connection {....raises: [], tags: [].}

method readOnce(self: RelayConnection; pbytes: pointer; nbytes: int): Future[int] {.
    async: (...raises: [CancelledError, LPStreamError], raw: true), ...raises: [],
    tags: [].}

method write(self: RelayConnection; msg: seq[byte]): Future[void] {.
    async: (...raises: [CancelledError, LPStreamError]), ...raises: [], tags: [].}