Source file dns_forward_error.ml

(*
 * Copyright (C) 2016 David Scott <dave@recoil.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *)
open Lwt.Infix

type 'a t = ('a, [ `Msg of string ]) Lwt_result.t

let errorf fmt = Fmt.kstrf (fun s -> Lwt.return (Error (`Msg s))) fmt

module FromFlowError(Flow: Mirage_flow_lwt.S) = struct
  let (>>=) m f = m >>= function
    | `Eof     -> errorf "Unexpected end of file"
    | `Error e -> errorf "%a" Flow.pp_error e
    | `Ok x    -> f x
end

module Infix = Lwt_result.Infix