~ syntax stuff

unikernel/unikernel.ml

@@ -148,38 +148,45 @@ struct
   end
 
   let tls certificate_ro key_ro =
-    let ( >>= ) = Lwt_result.bind in
-    Keys_ro.list key_ro Mirage_kv.Key.empty
-    |> map_err_to_string Keys_ro.pp_error
-    >>= fun keys ->
+    let ( let*? ) = Lwt_result.bind in
+    let ( let+? ) x f = Lwt_result.map f x in
+    let*? keys =
+      Keys_ro.list key_ro Mirage_kv.Key.empty
+      |> map_err_to_string Keys_ro.pp_error
+    in
     let keys = List.filter (fun (_, t) -> t = `Value) keys in
-    Certificates_ro.list certificate_ro Mirage_kv.Key.empty
-    |> map_err_to_string Certificates_ro.pp_error
-    >>= fun certificates ->
+    let*? certificates =
+      Certificates_ro.list certificate_ro Mirage_kv.Key.empty
+      |> map_err_to_string Certificates_ro.pp_error
+    in
     let certificates = List.filter (fun (_, t) -> t = `Value) certificates in
     let fold acc (name, _) =
       match Mirage_kv.Key.basename name with
       | ".gitkeep" -> Lwt.return acc
       | _ ->
-          Certificates_ro.get certificate_ro name
-          |> map_err_to_string Certificates_ro.pp_error
-          >>= (Lwt.return <.> X509.Certificate.decode_pem_multiple)
-          >>= fun certificates ->
-          Lwt.return acc >>= fun acc ->
-          Lwt.return_ok ((name, certificates) :: acc)
+          let*? data =
+            Certificates_ro.get certificate_ro name
+            |> map_err_to_string Certificates_ro.pp_error
+          in
+          let*? certificates =
+            Lwt.return (X509.Certificate.decode_pem_multiple data)
+          in
+          let+? acc = Lwt.return acc in
+          (name, certificates) :: acc
     in
-    Lwt_list.fold_left_s fold (Ok []) certificates >>= fun certificates ->
+    let*? certificates = Lwt_list.fold_left_s fold (Ok []) certificates in
     let fold acc (name, _) =
       match Mirage_kv.Key.basename name with
       | ".gitkeep" -> Lwt.return acc
       | _ ->
-          Keys_ro.get key_ro name
-          |> map_err_to_string Keys_ro.pp_error
-          >>= (Lwt.return <.> X509.Private_key.decode_pem)
-          >>= fun key ->
-          Lwt.return acc >>= fun acc -> Lwt.return_ok ((name, key) :: acc)
+          let*? data =
+            Keys_ro.get key_ro name |> map_err_to_string Keys_ro.pp_error
+          in
+          let*? key = Lwt.return (X509.Private_key.decode_pem data) in
+          let+? acc = Lwt.return acc in
+          (name, key) :: acc
     in
-    Lwt_list.fold_left_s fold (Ok []) keys >>= fun keys ->
+    let+? keys = Lwt_list.fold_left_s fold (Ok []) keys in
     let tbl = Hashtbl.create 0x10 in
     List.iter
       (fun (name, certificates) ->
@@ -188,9 +195,9 @@ struct
         | None -> ())
       certificates;
     match Hashtbl.fold (fun _ certchain acc -> certchain :: acc) tbl [] with
-    | [] -> Lwt.return_ok `None
-    | [ certchain ] -> Lwt.return_ok (`Single certchain)
-    | certchains -> Lwt.return_ok (`Multiple certchains)
+    | [] -> `None
+    | [ certchain ] -> `Single certchain
+    | certchains -> `Multiple certchains
 
   let http_1_1_request_handler ~ctx ~authenticator flow _edn =
     let module R = (val Mimic.repr HTTP_server.tcp_protocol) in