Source file `logs_async.ml`

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(*---------------------------------------------------------------------------
  Copyright (c) 2019 Vincent Bernardoff
  Copyright (c) 2015 Daniel C. Bünzli. All rights reserved.
  Distributed under the ISC license, see terms at the end of the file.
  ---------------------------------------------------------------------------*)

open Async_kernel

type 'a log = ('a, unit Deferred.t) Logs.msgf -> unit Deferred.t

let kmsg k ?(src = Logs.default) level msgf =
  match Logs.Src.level src with
  | None -> k ()
  | Some level' when level > level' ->
    if level = Logs.Error
    then Logs.incr_err_count ()
    else if level = Logs.Warning
    then Logs.incr_warn_count ()
    else ();
    k ()
  | Some _ ->
    if level = Logs.Error
    then Logs.incr_err_count ()
    else if level = Logs.Warning
    then Logs.incr_warn_count ()
    else ();
    let iv = Ivar.create () in
    let k () = Deferred.bind (Ivar.read iv) ~f:k in
    let over () = Ivar.fill_exn iv () in
    Logs.report src level ~over k msgf
;;

let kunit _ = Deferred.unit
let msg ?src level msgf = kmsg kunit ?src level msgf
let app ?src msgf = kmsg kunit ?src Logs.App msgf
let err ?src msgf = kmsg kunit ?src Logs.Error msgf
let warn ?src msgf = kmsg kunit ?src Logs.Warning msgf
let info ?src msgf = kmsg kunit ?src Logs.Info msgf
let debug ?src msgf = kmsg kunit ?src Logs.Debug msgf

let on_error ?src ?(level = Logs.Error) ?header ?tags ~pp ~use t =
  Deferred.bind t ~f:(function
    | Ok v -> Deferred.return v
    | Error e ->
      kmsg (fun () -> use e) ?src level @@ fun m -> m ?header ?tags "@[%a@]" pp e)
;;

let on_error_msg ?src ?(level = Logs.Error) ?header ?tags ~use t =
  Deferred.bind t ~f:(function
    | Ok v -> Deferred.return v
    | Error (`Msg e) ->
      kmsg use ?src level @@ fun m -> m ?header ?tags "@[%a@]" Format.pp_print_text e)
;;

(* Source specific functions *)

module type LOG = sig
  val msg : Logs.level -> 'a log
  val app : 'a log
  val err : 'a log
  val warn : 'a log
  val info : 'a log
  val debug : 'a log

  val kmsg
    :  ?over:(unit -> unit)
    -> (unit -> 'b Deferred.t)
    -> Logs.level
    -> ('a, 'b Deferred.t) Logs.msgf
    -> 'b Deferred.t

  val on_error
    :  ?level:Logs.level
    -> ?header:string
    -> ?tags:Logs.Tag.set
    -> pp:(Format.formatter -> 'b -> unit)
    -> use:('b -> 'a Deferred.t)
    -> ('a, 'b) result Deferred.t
    -> 'a Deferred.t

  val on_error_msg
    :  ?level:Logs.level
    -> ?header:string
    -> ?tags:Logs.Tag.set
    -> use:(unit -> 'a Deferred.t)
    -> ('a, [ `Msg of string ]) result Deferred.t
    -> 'a Deferred.t
end

let src_log src =
  let module Log = struct
    let msg level msgf = msg ~src level msgf
    let kmsg ?over:_ k level msgf = kmsg k ~src level msgf
    let app msgf = msg Logs.App msgf
    let err msgf = msg Logs.Error msgf
    let warn msgf = msg Logs.Warning msgf
    let info msgf = msg Logs.Info msgf
    let debug msgf = msg Logs.Debug msgf

    let on_error ?level ?header ?tags ~pp ~use =
      on_error ~src ?level ?header ?tags ~pp ~use
    ;;

    let on_error_msg ?level ?header ?tags ~use =
      on_error_msg ~src ?level ?header ?tags ~use
    ;;
  end
  in
  (module Log : LOG)
;;

(*---------------------------------------------------------------------------
  Copyright (c) 2019 Vincent Bernardoff
  Copyright (c) 2015 Daniel C. Bünzli

  Permission to use, copy, modify, and/or 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.
  ---------------------------------------------------------------------------*)