Source file `config_service.ml`

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open Base
module Sig = Config_service_sig

module Make (Log : Log.Service.Sig.SERVICE) : Sig.SERVICE = struct
  let lifecycle =
    Core.Container.Lifecycle.make "config" ~dependencies:[ Log.lifecycle ]
      (fun ctx -> Lwt.return ctx)
      (fun _ -> Lwt.return ())

  let register_config config =
    Log.debug (fun m -> m "CONFIG: Register config");
    Config_core.Internal.register config

  let is_testing () =
    Sys.getenv "SIHL_ENV"
    |> Option.value ~default:"development"
    |> String.equal "test"

  let is_production () =
    Sys.getenv "SIHL_ENV"
    |> Option.value ~default:"development"
    |> String.equal "production"

  let read_string_default ~default key =
    let value =
      Option.first_some (Sys.getenv key)
        (Map.find (Config_core.Internal.get ()) key)
    in
    Option.value value ~default

  let read_string_opt key =
    Option.first_some (Sys.getenv key)
      (Map.find (Config_core.Internal.get ()) key)

  let read_string ?default key =
    let value = read_string_opt key in
    match (default, value) with
    | _, Some value -> value
    | Some default, None -> default
    | None, None ->
        raise
          (Config_core.Exception
             (Printf.sprintf "CONFIG: Configuration %s not found" key))

  let read_int_opt key =
    let value =
      Option.first_some (Sys.getenv key)
        (Map.find (Config_core.Internal.get ()) key)
    in
    Option.bind value ~f:(fun value ->
        Option.try_with (fun () -> Base.Int.of_string value))

  let read_int ?default key =
    let value = read_int_opt key in
    match (default, value) with
    | _, Some value -> value
    | Some default, None -> default
    | None, None ->
        raise
          (Config_core.Exception
             (Printf.sprintf "CONFIG: Configuration %s not found" key))

  let read_bool_opt key =
    let value =
      Option.first_some (Sys.getenv key)
        (Map.find (Config_core.Internal.get ()) key)
    in
    Option.bind value ~f:(fun value ->
        Option.try_with (fun () -> Base.Bool.of_string value))

  let read_bool ?default key =
    let value = read_bool_opt key in
    match (default, value) with
    | _, Some value -> value
    | Some default, None -> default
    | None, None ->
        raise
          (Config_core.Exception
             (Printf.sprintf "CONFIG: Configuration %s not found" key))
end