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] {.stackTrace: false,
    ...raises: [], gcsafe, raises: [], raises: [], tags: [RootEffect].}

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

method readOnce(self: RelayConnection; pbytes: pointer; nbytes: int): Future[int] {.
    stackTrace: false, ...raises: [], gcsafe, raises: [], raises: [],
    tags: [RootEffect].}

method write(self: RelayConnection; msg: seq[byte]): Future[void] {.
    stackTrace: false, ...raises: [], gcsafe, raises: [], raises: [],
    tags: [RootEffect].}