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|
open Lwt.Syntax
open Lwt.Infix
open Lwt_react
type state =
| Disconnected
| Connecting
| Connected of Portal.t * Stream.features
(** [connect domain config] is a promise containing the portal connected to the XMPP
server located at [domain], and all its supported features.
Basically, it conforms to {{:
https://datatracker.ietf.org/doc/html/rfc6120#section-4.3 }}, and gets the provided
Portal in a "ready" state. *)
let connect (domain : string) (config : Stream.config) : (Portal.t * Stream.features) Lwt.t =
let open Portal in
let open Stream in
let* portal = connect domain
in
let needs_restart = function
| Feature.Mechanisms _ | STARTTLS -> true
| _ -> false
in
let+ features =
let rec handle_features (features : Stream.features) : Stream.features Lwt.t =
match features with
| feature :: rest ->
let* () = negotiate feature portal config
in if needs_restart (Feature.unwrap feature)
then start domain portal >>= handle_features
else handle_features rest
| features -> Lwt.return features
in start domain portal >>= handle_features
in (portal, features)
let create (domain : string) (config : Stream.config) : (state signal * (unit -> unit)) Lwt.t =
let state, update = S.create Disconnected in
let+ () = S.map_s
(function
| Connecting -> let+ portal, features = connect domain config
in update (Connected (portal, features))
| _ -> Lwt.return_unit)
state >|= S.keep;
in state, (fun () -> update Connecting)
|
