Skip to content

GitLab

Switch branch/tag
Find file Normal viewHistoryPermalink
webiface.ml 7.96 KB
Newer Older
Pietro Abate's avatar
[r2002-11-10 04:37:17 by cvscast] Empty log message    
Pietro Abate committed
1
2
3
4
5
6 
(* TODO:
   - correct error messages, not failwith "..."
   - HTML design, logo
   - dump
*)
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
7 
open Netcgi
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
8 
exception Timeout
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
9
Pietro Abate's avatar
[r2002-11-10 13:06:17 by cvscast] Empty log message    
Pietro Abate committed
10
11
12
13
14
15 
let operating_type = Netcgi.buffered_transactional_optype
let cgi = new Netcgi.std_activation ~operating_type ()

let fatal_error title s =
  cgi # output # rollback_work();
  cgi # set_header
Pietro Abate's avatar
[r2002-11-10 13:12:27 by cvscast] Empty log message    
Pietro Abate committed
16 
    ~content_type:"text/html; charset=\"iso-8859-1\""
Pietro Abate's avatar
[r2002-11-10 13:06:17 by cvscast] Empty log message    
Pietro Abate committed
17
18
19
20 
    ~cache:`No_cache 
    ();
  cgi # output # output_string ("<h1>" ^ title ^ "</h1>");
  cgi # output # output_string s;
Pietro Abate's avatar
[r2002-11-10 13:50:17 by cvscast] Empty log message    
Pietro Abate committed
21 
  cgi # output # output_string "\n";
Pietro Abate's avatar
[r2002-11-10 13:06:17 by cvscast] Empty log message    
Pietro Abate committed
22 
  cgi # output # commit_work();
Pietro Abate's avatar
[r2002-11-10 13:45:59 by cvscast] Empty log message    
Pietro Abate committed
23
24 
  cgi # finalize ();
  exit 0
Pietro Abate's avatar
[r2002-11-10 13:06:17 by cvscast] Empty log message    
Pietro Abate committed
25
26
Pietro Abate's avatar
[r2002-11-10 04:37:17 by cvscast] Empty log message    
Pietro Abate committed
27
28 
(* Configuration *)
Pietro Abate's avatar
[r2002-11-25 23:34:14 by cvscast] Empty log message    
Pietro Abate committed
29 
let session_dirs = [ "/home/beppe/sessions"; "/home/frisch/sessions"; "/users/formel/cduce/sessions"]
Pietro Abate's avatar
[r2002-11-10 12:56:43 by cvscast] Empty log message    
Pietro Abate committed
30
31 
let session_dir = 
  try List.find Sys.file_exists session_dirs
Pietro Abate's avatar
[r2002-11-10 13:06:17 by cvscast] Empty log message    
Pietro Abate committed
32
33 
  with Not_found -> fatal_error "Internal error" 
    "Cannot find sessions directory"
Pietro Abate's avatar
[r2002-11-10 04:37:17 by cvscast] Empty log message    
Pietro Abate committed
34
35
36
37
38 
let timeout = 60 * 5  (* seconds *)
let max_sess = 10

(*****************)
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
39
Pietro Abate's avatar
[r2002-11-16 00:26:48 by cvscast] Empty log message    
Pietro Abate committed
40
41
42
43
44
45 
(* Loading examples *)

let example code = 
  try List.assoc code Examples.examples
  with Not_found -> ""
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
46
47
48
49
50
51
52 
let begin_table =
"<table width='100%' border=0 cellspacing=0 cellpadding=2 bgcolor=black>
<tr><td>
<table width='100%' border=0 cellspacing=0 cellpadding=3 bgcolor=white>
<tr><td>"

let end_table = "</td></tr></table></td></tr></table><br>"
Pietro Abate's avatar
[r2002-11-16 00:26:48 by cvscast] Empty log message    
Pietro Abate committed
53
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
54
55
56
57 
let persistant = ref false
let session_id = ref ""

let html_header p =
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
58
59
60
61
62
63 
  p "<html><head><title>CDuce online prototype</title></head>";
  p "<body bgcolor='#BBDDFF'>";
  p begin_table;
  p "<h1>CDuce online prototype</h1>";
  p end_table;
Pietro Abate's avatar
[r2002-11-10 16:20:52 by cvscast] Empty log message    
Pietro Abate committed
64 
  if !persistant then
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
65
66 
    (p begin_table;
     p "You're running the CDuce prototype in session mode: values and
Pietro Abate's avatar
[r2002-11-10 16:20:52 by cvscast] Empty log message    
Pietro Abate committed
67
68 
types accepted by CDuce when you click 'Submit' will be available
for subsequent requests.";
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
69
70
71
72
73 
(*     p "<small> (session #"; p !session_id; p ")</small>"; *)
     p end_table)
  else
    (p begin_table;
     p "This page is a front-end to a prototype implementation of CDuce.";
Pietro Abate's avatar
[r2002-11-16 11:53:47 by cvscast] Empty log message    
Pietro Abate committed
74 
     p "You can start from one of the predefined examples below or try ";
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
75
76
77
78
79 
     p "with you own program...";
     p "The session mode remembers CDuce definitions across requests.";
     p Examples.present;
     p end_table)
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
80
81 

let html_form p content =
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
82
83 
  p begin_table;
  p "<h2>Input</h2>";
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
84 
  p "<form method=post>";
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
85 
  p "<input type=submit name=exec value='Submit to CDuce'>";
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
86 
  if !persistant then(
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
87
88
89 
    p "<input type=submit name=dump value='Show current environment'>";
    p "<input type=submit name=close value='Close session'>";
    p "<input type=hidden name=session value='"; p !session_id; p "'>";
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
90
91
92
93 
  ) else (
    p "<input type=submit name=open value=\"Initiate session\">";
  );
  p "<br><textarea name=prog cols=80 rows=25>"; p content; p "</textarea>";
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
94
95 
  p "</form>";
  p end_table
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
96
97
98 


let html_footer p =
Pietro Abate's avatar
[r2002-11-10 13:50:17 by cvscast] Empty log message    
Pietro Abate committed
99 
  p "</body></html>\n"
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139 


let () =
  Random.self_init (); 
  State.close ()

let session_file sid =
  Filename.concat session_dir sid

let gen_session_id () =  string_of_int (Random.bits ())

let check_session_id sid =
  try ignore (int_of_string sid)
  with _ -> failwith "Invalid session id"

let close_session sid =
  check_session_id sid;
  try Unix.unlink (session_file sid)
  with Unix.Unix_error (_,_,_) -> ()

let flush_sessions () =
  let time = Unix.time () -. (float timeout) in
  let n = ref 0 in
  let dir = Unix.opendir session_dir in 
  try while true do
    let f = session_file (Unix.readdir dir) in
    let st = Unix.stat f in
    if (st.Unix.st_kind = Unix.S_REG) then
      if  (st.Unix.st_mtime < time) 
      then Unix.unlink f
      else incr n
  done; assert false with End_of_file ->
    Unix.closedir dir;
    !n


let cmds = [ "open", `Open;
	     "close", `Close;
	     "dump", `Dump;
	     "exec", `Exec;
Pietro Abate's avatar
[r2002-11-16 00:26:48 by cvscast] Empty log message    
Pietro Abate committed
140 
	     "example", `Example;
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
141
142 
	     "new", `New;
	   ]
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
143
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162 
let cut p w s =
  let rec aux i x =
    if i < String.length s then
      match s.[i] with
	| '\n' -> p '\n'; aux (i + 1) 0
	| '\r' -> aux (i + 1) 0
	| c -> 
	    let x = if x = w then (p '\\'; p '\n'; p ':'; 2) else (x + 1) in
	    p c; 
	    if c = '&' then
	      let rec ent i =
		p s.[i];
		if (s.[i] = ';') then aux (i + 1) x else ent (i + 1) in
	      ent (i + 1)
	    else
	      aux (i + 1) x
  in
  aux 0 0
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
163 
let main (cgi : Netcgi.std_activation) =
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
164
165 
  let p = cgi # output # output_string in
  let clicked s = cgi # argument_value s <> "" in
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
166 
  try
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
167 
    let nb_sessions = flush_sessions () in
Pietro Abate's avatar
[r2002-11-10 01:10:37 by cvscast] Empty log message    
Pietro Abate committed
168
169
170 
    cgi # set_header
      ~content_type:"text/html; charset=\"iso-8859-1\""
      ();
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
171
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
172
173
174
175
176
177
178
179 
    let cmd = 
      try snd (List.find (fun (x,y) -> clicked x) cmds)
      with Not_found -> `New in

    let sid = match cmd with
      | `Open ->
	  if (nb_sessions >= max_sess) then
	    failwith "Too many open sessions ...";
Pietro Abate's avatar
[r2002-11-10 04:37:17 by cvscast] Empty log message    
Pietro Abate committed
180
181
182
183
184 
	  let sid = gen_session_id () in
	  (* touch the session file ... *)
	  let chan = open_out_bin (session_file sid) in
	  close_out chan;
	  sid
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
185
186
187
188
189
190
191
192
193 
      | `Close -> close_session (cgi # argument_value "session"); ""
      | `New ->  ""
      | _ -> cgi # argument_value "session"
    in
    session_id := sid;
    persistant := !session_id <> "";
    if !persistant then check_session_id !session_id;
      
    let dialog content = html_form p content in
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
194
195
196 

    let load_state () =
      if !persistant then
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
197
198 
	try
	  let chan = open_in_bin (session_file !session_id) in
Pietro Abate's avatar
[r2002-11-10 04:37:17 by cvscast] Empty log message    
Pietro Abate committed
199
200
201 
	  if in_channel_length chan > 0 then
	    (let s = Marshal.from_channel chan in
	     State.set s);
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
202 
	  close_in chan;
Pietro Abate's avatar
[r2002-11-10 04:37:17 by cvscast] Empty log message    
Pietro Abate committed
203
204 
	with Sys_error _ ->
	  failwith "This session has expired ..."
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
205 
    in
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
206
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
207
208
209
210
211
212
213
214
215
216
217
218 
    let store_state () =
      if !persistant then
	let s = State.get () in
	let chan = open_out_bin (session_file !session_id) in
	Marshal.to_channel chan s [ Marshal.Closures ];
	close_out chan
    in
    
    let exec src =
      let ppf = Format.str_formatter
      and input = Stream.of_string src in
      Location.set_source (`String src);
Pietro Abate's avatar
[r2002-11-16 00:26:48 by cvscast] Empty log message    
Pietro Abate committed
219 
      Location.set_protected true;
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
220
Pietro Abate's avatar
[r2002-11-16 11:53:47 by cvscast] Empty log message    
Pietro Abate committed
221 
      Location.warning_ppf := ppf;
Pietro Abate's avatar
[r2002-11-13 23:21:38 by cvscast] Empty log message    
Pietro Abate committed
222 
      let ok = Cduce.run ppf ppf input in
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
223
224 
      if ok then Format.fprintf ppf "@\nOk.@\n";
      let res = Format.flush_str_formatter () in
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
225
226
227
228 
      p begin_table;
      p "<h2>Results</h2>";
      p "<pre>"; cut (cgi # output # output_char) 80 res;  p "</pre>";
      p end_table;
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
229
230 
      if ok then (dialog ""; store_state ()) else dialog src;
    in
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
231
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
232
233
234
235
236
237 
    let dump src =
      let ppf = Format.str_formatter in

      Cduce.dump_env ppf;

      let res = Format.flush_str_formatter () in
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
238
239
240
241 
      p begin_table;
      p "<h2>Current session environment</h2>";
      p ("<pre>" ^ res ^ "</pre>");
      p end_table;
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
242 
      dialog src
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
243
244 
    in
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
245 
    Location.set_viewport `Html;
Pietro Abate's avatar
[r2002-11-10 22:26:37 by cvscast] Passage au type XML    
Pietro Abate committed
246
247 
    load_state ();
    store_state ();  (* Just touch the file ... *)
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
248
249
250
251
252
253 
    html_header p;
    let prog = cgi # argument_value "prog" in
    (match cmd with
       | `Exec -> exec prog
       | `Open -> dialog prog
       | `New -> dialog ""
Pietro Abate's avatar
[r2002-11-10 16:13:31 by cvscast] Empty log message    
Pietro Abate committed
254 
       | `Dump -> dump prog
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
255 
       | `Close -> dialog ""
Pietro Abate's avatar
[r2002-11-16 00:26:48 by cvscast] Empty log message    
Pietro Abate committed
256 
       | `Example -> dialog (example (cgi # argument_value "example"))
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
257 
    );
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
258
259
260
261
262
263
264
265
266
267
268 
    p begin_table;
    p "<h2>About the prototype</h2>";
    p "CDuce is under active development; some features may not work properly.";
    p "We are planning a beta release for the beginning of 2003. ";
    p "The prototype is written in ";
    p "<a href='http://www.caml.inria.fr'>Objective Caml</a>, ";
    p "and uses several OCaml packages: ";
    p "<a href='http://caml.inria.fr/camlp4'>Camlp4</a>, ";
    p "<a href='http://ocamlnet.sourceforge.net/'>OCamlnet</a>, ";
    p "<a href='http://www.ocaml-programming.de/programming/pxp.html'>PXP</a>, ";
    p "<a href='http://www.eleves.ens.fr/home/frisch/soft#wlex'>wlex</a>.";
Pietro Abate's avatar
[r2002-11-16 22:17:14 by cvscast] Empty log message    
Pietro Abate committed
269 
    p "<p>";
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
270
271
272 
    p "<a href='mailto:Alain.Frisch@ens.fr'>Webmaster</a>";
    p end_table;
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
273 
    html_footer p;
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
274
275
276 
    cgi # output # commit_work()
  with
      exn ->
Pietro Abate's avatar
[r2002-11-10 13:45:59 by cvscast] Empty log message    
Pietro Abate committed
277
278
279 
	let msg = 
	  match exn with
	    | Unix.Unix_error (e,f,arg) ->
Pietro Abate's avatar
[r2002-11-10 04:26:26 by cvscast] Empty log message    
Pietro Abate committed
280
281
282 
		"System error: " ^ (Unix.error_message e) ^ 
		"; function " ^ f ^ 
		"; argument " ^ arg
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
283
284 
	    | Timeout ->
		"Timeout reached ! This prototype limits computation time ..."
Pietro Abate's avatar
[r2002-11-10 13:45:59 by cvscast] Empty log message    
Pietro Abate committed
285
286
287
288 
	    | exn ->
	      Printexc.to_string exn
	in
	fatal_error "Internal software error!" msg
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
289
290 

let () =
Pietro Abate's avatar
[r2002-11-25 23:29:46 by cvscast] Empty log message    
Pietro Abate committed
291 
  ignore (Unix.alarm 20);
Pietro Abate's avatar
[r2002-11-16 11:03:56 by cvscast] Empty log message    
Pietro Abate committed
292 
  Sys.set_signal Sys.sigalrm (Sys.Signal_handle (fun _ -> raise Timeout));
Pietro Abate's avatar
[r2002-11-09 10:42:14 by cvscast] Empty log message  
Pietro Abate committed
293
294
295 
  main cgi;
  cgi # finalize ()