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Add Service.fail_lwt convenience function #229

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Apr 27, 2021
Merged

Add Service.fail_lwt convenience function #229

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6 changes: 6 additions & 0 deletions capnp-rpc-lwt/capnp_rpc_lwt.mli
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Original file line number Diff line number Diff line change
Expand Up @@ -252,6 +252,12 @@ module Service : sig

val fail : ?ty:Capnp_rpc.Exception.ty -> ('a, Format.formatter, unit, 'b StructRef.t) format4 -> 'a
(** [fail msg] is an exception with reason [msg]. *)

val fail_lwt :
?ty:Capnp_rpc.Exception.ty ->
('a, Format.formatter, unit, (_, [> `Capnp of Capnp_rpc.Error.t]) Lwt_result.t) format4 ->
'a
(** [fail_lwt msg] is like [fail msg], but can be used with [return_lwt]. *)
end

(**/**)
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8 changes: 6 additions & 2 deletions capnp-rpc-lwt/service.ml
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Expand Up @@ -62,8 +62,8 @@ let return_empty () =
return @@ Response.create_empty ()

(* A convenient way to implement a simple blocking local function, where
pipelining is not supported (further messages will be queued up at this
host until it returns). *)
pipelining is not supported (messages sent to the result promise will be
queued up at this host until it returns). *)
let return_lwt fn =
let result, resolver = Local_struct_promise.make () in
Lwt.async (fun () ->
Expand All @@ -81,3 +81,7 @@ let return_lwt fn =
result

let fail = Core_types.fail

let fail_lwt ?ty fmt =
fmt |> Fmt.kstr @@ fun msg ->
Lwt_result.fail (`Capnp (`Exception (Capnp_rpc.Exception.v ?ty msg)))