+++ /dev/null
-(*
- * Copyright (C) 2003:
- * Stefano Zacchiroli <zack@cs.unibo.it>
- * for the HELM Team http://helm.cs.unibo.it/
- *
- * This file is part of HELM, an Hypertextual, Electronic
- * Library of Mathematics, developed at the Computer Science
- * Department, University of Bologna, Italy.
- *
- * HELM is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * HELM is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HELM; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- *
- * For details, see the HELM World-Wide-Web page,
- * http://helm.cs.unibo.it/
- *)
-
-(* TODO cache expires control!!! *)
-(* TODO uwobo loop:
- if two large proof (already in cache) are requested at the same time by two
- clients, uwobo (java implementation, not yet tested with the OCaml one)
- starts looping sending output to one of the client *)
-
-open Http_getter_common;;
-open Http_getter_debugger;;
-open Http_getter_misc;;
-open Http_getter_types;;
-open Printf;;
-
- (* expose ThreadSafe.threadSafe methods *)
-class threadSafe =
- object
- inherit ThreadSafe.threadSafe
- method virtual doCritical : 'a. 'a lazy_t -> 'a
- method virtual doReader : 'a. 'a lazy_t -> 'a
- method virtual doWriter : 'a. 'a lazy_t -> 'a
- end
-;;
-let threadSafe = new threadSafe ;;
-
-let resource_type_of_url = function
- | url when Pcre.pmatch ~pat:"\\.xml\\.gz$" url -> Enc_gzipped
- | url when Pcre.pmatch ~pat:"\\.xml$" url -> Enc_normal
- | url -> raise (Http_getter_invalid_URL url)
-let extension_of_resource_type = function
- | Enc_normal -> "xml"
- | Enc_gzipped -> "xml.gz"
-
- (* basename = resource name without trailing ".gz", if any *)
-let is_in_cache basename =
- Sys.file_exists
- (match Http_getter_env.cache_mode with
- | Enc_normal -> basename
- | Enc_gzipped -> basename ^ ".gz")
-
-let respond_xml ?(enc = Enc_normal) ?(patch = true) ~url ~uri outchan =
- let resource_type = resource_type_of_url url in
- let extension = extension_of_resource_type resource_type in
- let downloadname =
- match http_getter_uri_of_string uri with (* parse uri *)
- | Cic_uri (Cic baseuri) | Cic_uri (Theory baseuri) ->
- (* assumption: baseuri starts with "/" *)
- sprintf "%s%s.%s" Http_getter_env.cic_dir baseuri extension
- | Nuprl_uri baseuri ->
- (* assumption: baseuri starts with "/" *)
- sprintf "%s%s.%s" Http_getter_env.nuprl_dir baseuri extension
- | Rdf_uri (prefix, ((Cic baseuri) as qbaseuri))
- | Rdf_uri (prefix, ((Theory baseuri) as qbaseuri)) ->
- let escaped_prefix =
- (Pcre.replace ~pat:"/" ~templ:"_"
- (Pcre.replace ~pat:"_" ~templ:"__"
- (prefix ^
- (match qbaseuri with
- | Cic _ -> "//cic:"
- | Theory _ -> "//theory:"))))
- in
- sprintf "%s/%s%s.%s"
- Http_getter_env.rdf_dir escaped_prefix baseuri extension
- in
- let patch_fun =
- if patch then Http_getter_common.patch_xml else (fun x -> x)
- in
- let basename = Pcre.replace ~pat:"\\.gz$" downloadname in
- let contype = "text/xml" in
- (* File cache if needed and return a short circuit file.
- Short circuit is needed in situation like:
- resource type = normal, cache type = gzipped, required encoding = normal
- we would like to avoid normal -> gzipped -> normal conversions. To avoid
- this tmp_short_circuit is used to remember the name of the intermediate
- file name *)
- let fill_cache () =
- threadSafe#doWriter (lazy(
- if not (is_in_cache basename) then begin (* cache MISS *)
- debug_print "Cache MISS :-(";
- mkdir ~parents:true (Filename.dirname downloadname);
- match (resource_type, Http_getter_env.cache_mode) with
- | Enc_normal, Enc_normal | Enc_gzipped, Enc_gzipped ->
- wget ~output:downloadname url;
- None
- | Enc_normal, Enc_gzipped -> (* resource normal, cache gzipped *)
- let tmp = tempfile () in
- wget ~output:tmp url;
- gzip ~output:(basename ^ ".gz") ~keep:true tmp; (* fill cache *)
- if enc = Enc_normal then (* user wants normal: don't delete it! *)
- Some (tmp, enc)
- else begin
- Sys.remove tmp;
- None
- end
- | Enc_gzipped, Enc_normal -> (* resource gzipped, cache normal *)
- let tmp = tempfile () in
- wget ~output:tmp url;
- gunzip ~output:basename ~keep:true tmp; (* fill cache *)
- if enc = Enc_gzipped then (* user wants gzipped: don't delete it! *)
- Some (tmp, enc)
- else begin
- Sys.remove tmp;
- None
- end
- end else begin
- debug_print "Cache HIT :-)";
- None
- end
- )) in
- let tmp_short_circuit = fill_cache () in
- threadSafe#doReader (lazy(
- assert (is_in_cache basename);
- match (enc, Http_getter_env.cache_mode) with
- | Enc_normal, Enc_normal | Enc_gzipped, Enc_gzipped ->
- (* resource in cache is already in the required format *)
- (match enc with
- | Enc_normal ->
- debug_print "No format mangling required (encoding = normal)";
- return_file ~fname:basename ~contype ~patch_fun outchan
- | Enc_gzipped ->
- debug_print "No format mangling required (encoding = gzipped)";
- return_file
- ~fname:(basename ^ ".gz") ~contype ~contenc:"x-gzip"
- ~patch_fun ~gunzip:true
- outchan)
- | Enc_normal, Enc_gzipped | Enc_gzipped, Enc_normal ->
- (match tmp_short_circuit with
- | None -> (* no short circuit possible, use cache *)
- debug_print "No short circuit available, use cache";
- let tmp = tempfile () in
- (match enc with
- | Enc_normal ->
- (* required format is normal, cached version is gzipped *)
- gunzip (* gunzip to tmp *)
- ~output:tmp ~keep:true (basename ^ ".gz");
- return_file ~fname:tmp ~contype ~patch_fun outchan;
- | Enc_gzipped ->
- (* required format is gzipped, cached version is normal *)
- gzip ~output:tmp ~keep:true basename; (* gzip to tmp *)
- return_file
- ~fname:tmp ~contype ~contenc:"x-gzip"
- ~patch_fun ~gunzip:true
- outchan);
- Sys.remove tmp
- | Some (fname, Enc_normal) -> (* short circuit available, use it! *)
- debug_print "Using short circuit (encoding = normal)";
- return_file ~fname ~contype ~patch_fun outchan;
- Sys.remove fname
- | Some (fname, Enc_gzipped) -> (* short circuit available, use it! *)
- debug_print "Using short circuit (encoding = gzipped)";
- return_file
- ~fname ~contype ~contenc:"x-gzip" ~patch_fun ~gunzip:true outchan;
- Sys.remove fname)
- ))
-;;
-
- (* TODO enc is not yet supported *)
-let respond_xsl ?(enc = Enc_normal) ?(patch = true) ~url outchan =
- let patch_fun =
- if patch then Http_getter_common.patch_xsl else (fun x -> x)
- in
- let fname = tempfile () in
- wget ~output:fname url;
- return_file ~fname ~contype:"text/xml" ~patch_fun outchan;
- Sys.remove fname
-;;
-
- (* TODO enc is not yet supported *)
-let respond_dtd ?(enc = Enc_normal) ?(patch = true) ~url outchan =
- let patch_fun =
- if patch then Http_getter_common.patch_dtd else (fun x -> x)
- in
- if Sys.file_exists url then
- (* TODO check this: old getter here used text/xml *)
- return_file ~fname:url ~contype:"text/plain" ~patch_fun outchan
- else
- return_html_error ("Can't find DTD: " ^ url) outchan
-
projects / helm.git / blobdiff