(* This is a webserver built from the Netplex and Nethttpd components.
 * It is configured in the netplex.cfg file. 
 * Note: start program with option "-conf netplex.cfg" 
 *)

(**********************************************************************)
(* Dynamic page: The "adder", known from cgi                          *)
(**********************************************************************)

open Printf;;

let text = Netencoding.Html.encode_from_latin1;;
(* This function encodes "<", ">", "&", double quotes, and Latin 1 characters 
 * as character entities. E.g. text "<" = "&lt;", and text "ä" = "&auml;"
 *)

let begin_page cgi title =
  (* Output the beginning of the page with the passed [title]. *)
  let out = cgi # output # output_string in
  out "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n";
  out "<HTML>\n";
  out "<HEAD>\n";
  out ("<TITLE>" ^ text title ^ "</TITLE>\n");
  out ("<STYLE TYPE=\"text/css\">\n");
  out "body { background: white; color: black; }\n";
  out "</STYLE>\n";
  out "</HEAD>\n";
  out "<BODY>\n";
  out ("<H1>" ^ text title ^ "</H1>\n")
;;


let end_page cgi =
  let out = cgi # output # output_string in
  out "</BODY>\n";
  out "</HTML>\n"
;;


let generate_query_page (cgi : Netcgi.cgi_activation) =
  (* Display the query form. *)
  begin_page cgi "Add Two Numbers";
  let out = cgi # output # output_string in
  out "<P>This CGI page can perform additions. Please enter two integers,\n";
  out "and press the button!\n";
  out (sprintf "<P><FORM METHOD=GET ACTION=\"%s\">\n" 
	 (text (cgi#url())));
  (* Note that cgi#url() returns the URL of this script (without ? clause).
   * We pass this string through the text function to avoid problems with
   * some characters.
   *)
  out "<INPUT TYPE=TEXT NAME=\"x\"> + <INPUT TYPE=TEXT NAME=\"y\"> = ";
  out "<INPUT TYPE=SUBMIT NAME=\"button\" VALUE=\"Go!\">\n";
  (* The hidden field only indicates that now the result page should
   * be consulted.
   *)
  out "<INPUT TYPE=HIDDEN NAME=\"page\" VALUE=\"result\">\n";
  out "</FORM>\n";
  end_page cgi
;;


let generate_result_page (cgi : Netcgi.cgi_activation) =
  (* Compute the result, and display it *)
  begin_page cgi "Sum";
  let out = cgi # output # output_string in
  out "<P>The result is:\n";
  let x = cgi # argument_value "x" in
  let y = cgi # argument_value "y" in
  let sum = (int_of_string x) + (int_of_string y) in
  out (sprintf "<P>%s + %s = %d\n" x y sum);
  out (sprintf "<P><A HREF=\"%s\">Add further numbers</A>\n" 
	 (text (cgi#url 
		  ~with_query_string:
		                   (`Args [new Netcgi.simple_argument "page" "query"])
		  ()
	       )));
  (* Here, the URL contains the CGI argument "page", but no other arguments. *)
  end_page cgi
;;


let generate_page (cgi : Netcgi.cgi_activation) =
  (* Check which page is to be displayed. This is contained in the CGI
   * argument "page".
   *)
  match cgi # argument_value "page" with
      "" ->
	(* The argument is the empty string, or the argument is missing.
	 * This is the same like the page "query".
	 *)
	generate_query_page cgi
    | "query" ->
	generate_query_page cgi
    | "result" ->
	generate_result_page cgi
    | _ ->
	assert false
;;


let process (cgi : Netcgi.cgi_activation) =
  (* The [try] block catches errors during the page generation. *)
  try
    (* Set the header. The header specifies that the page must not be
     * cached. This is important for dynamic pages called by the GET
     * method, otherwise the browser might display an old version of
     * the page.
     * Furthermore, we set the content type and the character set.
     * Note that the header is not sent immediately to the browser because
     * we have enabled HTML buffering.
     *)
    cgi # set_header 
      ~cache:`No_cache 
      ~content_type:"text/html; charset=\"iso-8859-1\""
      ();

    generate_page cgi;

    (* After the page has been fully generated, we can send it to the
     * browser. 
     *)
    cgi # output # commit_work();
  with
      error ->
	(* An error has happened. Generate now an error page instead of
	 * the current page. By rolling back the output buffer, any 
	 * uncomitted material is deleted.
	 *)
	cgi # output # rollback_work();

	(* We change the header here only to demonstrate that this is
	 * possible.
	 *)
	cgi # set_header 
	  ~status:`Forbidden                  (* Indicate the error *)
	  ~cache:`No_cache 
	  ~content_type:"text/html; charset=\"iso-8859-1\""
	  ();

	begin_page cgi "Software error";
        cgi # output # output_string "While processing the request an O'Caml exception has been raised:<BR>";
        cgi # output # output_string ("<TT>" ^ text(Printexc.to_string error) ^ "</TT><BR>");
	end_page cgi;

	(* Now commit the error page: *)
	cgi # output # commit_work()
;;


(**********************************************************************)
(* Create the webserver                                               *)
(**********************************************************************)


let start() =
  let (opt_list, cmdline_cfg) = Netplex_main.args() in

  let use_mt = ref false in

  let opt_list' =
    [ "-mt", Arg.Set use_mt,
      "  Use multi-threading instead of multi-processing";

      "-debug", Arg.String (fun s -> Netlog.Debug.enable_module s),
      "<module>  Enable debug messages for <module>";

      "-debug-all", Arg.Unit (fun () -> Netlog.Debug.enable_all()),
      "  Enable all debug messages";

      "-debug-list", Arg.Unit (fun () -> 
                                 List.iter print_endline (Netlog.Debug.names());
                                 exit 0),
      "  Show possible modules for -debug, then exit";

      "-debug-win32", Arg.Unit (fun () -> 
                                  Netsys_win32.Debug.debug_c_wrapper true),
      "  Special debug log of Win32 wrapper"

    ] @ opt_list in

  Arg.parse 
    opt_list'
    (fun s -> raise (Arg.Bad ("Don't know what to do with: " ^ s)))
    "usage: netplex [options]";
  let parallelizer = 
    if !use_mt then
      Netplex_mt.mt()     (* multi-threading *)
    else
      Netplex_mp.mp() in  (* multi-processing *)
  let adder =
    { Nethttpd_services.dyn_handler = (fun _ -> process);
      dyn_activation = Nethttpd_services.std_activation `Std_activation_buffered;
      dyn_uri = None;                 (* not needed *)
      dyn_translator = (fun _ -> ""); (* not needed *)
      dyn_accept_all_conditionals = false;
    } in
  let nethttpd_factory = 
    Nethttpd_plex.nethttpd_factory
      ~handlers:[ "adder", adder ]
      () in
  Netplex_main.startup
    parallelizer
    Netplex_log.logger_factories   (* allow all built-in logging styles *)
    Netplex_workload.workload_manager_factories (* ... all ways of workload management *)
    [ nethttpd_factory ]           (* make this nethttpd available *)
    cmdline_cfg
;;

Printexc.record_backtrace true;
Netsys_signal.init();
start();;
