lanonna/pam/bin/mq.ml

open Amqp_client_lwt

let handle_consumer_exn _exn =
  Lwt.return_unit (* TODO *)

let no_routing_key = `Queue ""

type rabbit_actor = {queue: Queue.t; channel: Channel.no_confirm Channel.t; connection: Connection.t}

let init (mq_url, mq_user, mq_password) consume_fn =
  (* Init rabbitmq client *)
  let%lwt connection = Amqp.Connection.connect ~credentials:(mq_user, mq_password) ~id:"pam" mq_url in
  let%lwt channel = Amqp.Connection.open_channel ~id:"pam" Amqp.Channel.no_confirm connection in
  let%lwt queue = Amqp.Queue.declare channel "pam" in
  let _ = Pamlog.info "Initialized rabbitmq client" in

  (* Establish consumer *)
  let%lwt (_ampq_consumer, reader) = Amqp.Queue.consume ~no_ack:true ~id:"" channel queue in
  let _ = Thread.spawn ~exn_handler:handle_consumer_exn (Thread.Pipe.iter_without_pushback reader ~f:consume_fn) in
  Lwt.return {queue=queue; channel=channel; connection=connection}

let shutdown {queue=_queue; channel; connection} =
  let ignore_exn = fun _ -> Lwt.return_unit in
  let%lwt _ = Lwt.catch (fun () -> Amqp.Channel.close channel) ignore_exn in
  let%lwt _ = Lwt.catch (fun () -> Amqp.Connection.close connection) ignore_exn in
  Lwt.return_unit


let mq_publish {queue=_; channel=channel; connection=_} msg =
  let _ = Pamlog.info [%string "GOT MSG FOR MQ:: %{msg}"] in
  let%lwt _ =
    Message.make msg
    |> Exchange.publish channel Exchange.default  ~routing_key:"lanonna"
  in Lwt.return_unit

let error_msg_to_json_format room_id error =
  let open Yojson.Basic in
  let content = [%string {|Pam è entrata in errore: %{error}| |}] in
  let d = `Assoc [
      ("content", `String content);
      ("source_message_id", `Null);
      ("room_id", `String room_id);
      ("as_reply", `Bool false);
      ("as_markdown", `Bool true)
    ] in
  to_string d