core hello world /

open Core.Std
open Async.Std

let port_arg () =
    flag "-port" (optional_with_default 8124 int)
      ~doc:" Broker's port"

let host_arg () =
    flag "-hostname" (optional_with_default "" string)
      ~doc:" Broker's hostname"

let with_rpc_conn f ~host ~port = "starting RPC connection to %s:%d" host port;
    (Tcp.to_host_and_port host port)
    ~timeout:(sec 1.)
    (fun r w -> "Connection established";
      Rpc.Connection.create r w ~connection_state:()
      >>= function
      | Error exn -> "Received error";
        raise exn
      | Ok conn -> "Calling handling function";
        f conn

let start_server ~env ?(stop=Deferred.never ()) ~implementations ~port () = "starting server on %d" port;
  let implementations =
    Rpc.Implementations.create_exn ~implementations
      ~on_unknown_rpc:(`Call (fun ~rpc_tag ~version -> "Unexpected RPC, tag %s, version %d" rpc_tag version))
  in "About to start TCP server";
    ~on_handler_error:(`Call (fun _ exn -> Log.Global.sexp exn Exn.sexp_of_t))
    (Tcp.on_port port)
    (fun _addr r w ->
      Rpc.Connection.server_with_close r w
          `Call (fun exn -> Log.Global.sexp exn Exn.sexp_of_t; return ()))
  >>= fun server -> "TCP server started, waiting for close";
    [ (stop >>= fun () -> Tcp.Server.close server)
    ; Tcp.Server.close_finished server ]
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