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Add Monitor.exn_to_error #5

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Add Monitor.exn_to_error #5

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14 changes: 14 additions & 0 deletions src/monitor.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -243,6 +243,20 @@ let send_exn t ?backtrace exn =
loop t
;;

let exn_to_error exn =
match exn with
| Error_ {exn; backtrace; _} ->
let backtrace =
match backtrace with
| Some backtrace -> `This (Backtrace.to_string backtrace)
| None -> `Get
in
Error.tag ~tag:"monitor.ml.Error"
(Error.of_exn ~backtrace exn)
| exn ->
Error.of_exn ~backtrace:`Get exn
;;

module Exported_for_scheduler = struct
let within_context context f =
Scheduler.(with_execution_context (t ())) context ~f:(fun () ->
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6 changes: 6 additions & 0 deletions src/monitor.mli
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,12 @@ val get_next_error : t -> exn Deferred.t
backtrace from the error (see discussion in [try_with]). *)
val extract_exn : exn -> exn

(** [exn_to_error] extracts the exn from an error exn that comes from a monitor,
repackaging it into an [Error.t]. If it is not supplied such an error exn, the
backtrace is inferred and the exn is packaged as given.
*)
val exn_to_error : exn -> Error.t

(** [has_seen_error t] returns true iff the monitor has ever seen an error. *)
val has_seen_error : t -> bool

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