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(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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(* copy of this software and associated documentation files (the "Software"),*)
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module Output : sig
  type t =
    | Null
    | Stdout
    | Stderr
    | File of string
    | Syslog of Lwt_log.syslog_facility

  val encoding : t Data_encoding.t

  val of_string : string -> t option

  val to_string : t -> string

  val pp : Format.formatter -> t -> unit
end

type cfg = {
  output : Output.t;
  default_level : Internal_event.level;
  rules : string option;
  template : Lwt_log_core.template;
}

val default_cfg : cfg

val create_cfg :
  ?output:Output.t ->
  ?default_level:Internal_event.level ->
  ?rules:string ->
  ?template:Lwt_log_core.template ->
  unit ->
  cfg

val cfg_encoding : cfg Data_encoding.t

(** Configure the event-logging sink defined in
    {!Internal_event.Lwt_log_sink} by merging the contents of [?cfg]
    (default: {!default_cfg}) and the value of the ["TEZOS_LOG"]
    environment variable. *)
val initialize : ?cfg:cfg -> unit -> unit Lwt.t