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

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

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

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