1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
26 exception XsltProcessorCouldNotSend;;
27 exception XsltProcessorCouldNotReceive;;
29 let portserver = 12345;;
30 let portclient = 12346;;
31 let time_to_wait = 10;;
33 let rec process uri usecache mode =
34 let module U = Unix in
35 let uri = UriManager.string_of_uri uri in
36 let pid = string_of_int (U.getpid ())
38 let uri' = Str.replace_first (Str.regexp ".*:") "" uri in
39 Str.global_replace (Str.regexp "/") "_"
40 (Str.global_replace (Str.regexp "_") "__" uri')
41 in let tmpfile = "/tmp/helm_" ^ filename' ^ "_" ^ pid in
42 (* test if the cache can be used *)
43 let tmp_file_exists = Sys.file_exists tmpfile in
44 if usecache && tmp_file_exists then
47 let url = Configuration.getter_url ^ uri in
48 (* purge the cache if asked to *)
49 if not usecache && tmp_file_exists then
51 (* let string_to_send = mode ^ " " ^ url ^ " " ^ tmpfile in *)
52 let string_to_send = "apply " ^ url ^ " " ^ tmpfile ^
55 | "theory" -> " T1 T2"
57 (* next function is for looping in case the server is not responding *)
58 let socketserver = U.socket U.PF_INET U.SOCK_DGRAM 0 in
59 let rec contact_server () =
61 U.sendto socketserver string_to_send 0 (String.length string_to_send)
62 [] (U.ADDR_INET(U.inet_addr_any,portserver))
64 if n = -1 then raise XsltProcessorCouldNotSend ;
65 let process_signal _ = () in
66 Sys.set_signal Sys.sigalrm (Sys.Signal_handle process_signal) ;
67 (* if the server does not respond, repeat the query *)
68 ignore (U.alarm time_to_wait) ;
70 if U.recv socketserver "" 0 0 [] = -1 then
71 raise XsltProcessorCouldNotReceive ;
72 ignore (U.alarm 0) ; (* stop the bomb *)
73 Sys.set_signal Sys.sigalrm Sys.Signal_default ;
74 U.close socketserver ;
77 U.Unix_error(_,"recv",_) ->
78 print_endline "Xaland server not responding. Retrying..." ;