113 lines
3.6 KiB
Prolog
113 lines
3.6 KiB
Prolog
/* Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: J.Wielemaker@uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 2009, University of Amsterdam
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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As a special exception, if you link this library with other files,
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compiled with a Free Software compiler, to produce an executable, this
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library does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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:- module(http_exception,
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[ map_exception_to_http_status/3
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]).
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/** <module> Internal module of the HTTP server
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@see http_header.pl, http_wrapper.pl
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*/
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%% map_exception_to_http_status(+Exception, -Reply, -HdrExtra)
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%
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% Map certain defined exceptions to special reply codes. The
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% http(not_modified) provides backward compatibility to
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% http_reply(not_modified).
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map_exception_to_http_status(http(not_modified),
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not_modified,
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[connection('Keep-Alive')]) :- !.
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map_exception_to_http_status(http_reply(Reply),
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Reply,
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[connection(Close)]) :- !,
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( keep_alive(Reply)
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-> Close = 'Keep-Alive'
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; Close = close
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).
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map_exception_to_http_status(http_reply(Reply, HdrExtra0),
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Reply,
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HdrExtra) :- !,
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( memberchk(close(_), HdrExtra0)
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-> HdrExtra = HdrExtra0
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; HdrExtra = [close(Close)|HdrExtra0],
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( keep_alive(Reply)
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-> Close = 'Keep-Alive'
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; Close = close
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)
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).
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map_exception_to_http_status(error(existence_error(http_location, Location), _),
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not_found(Location),
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[connection(close)]) :- !.
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map_exception_to_http_status(error(permission_error(_, http_location, Location), _),
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forbidden(Location),
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[connection(close)]) :- !.
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map_exception_to_http_status(error(threads_in_pool(_Pool), _),
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busy,
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[connection(close)]) :- !.
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map_exception_to_http_status(E,
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resource_error(E),
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[connection(close)]) :-
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resource_error(E), !.
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map_exception_to_http_status(E,
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bad_request(E),
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[connection(close)]) :-
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bad_request_error(E), !.
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map_exception_to_http_status(E,
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server_error(E),
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[connection(close)]).
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resource_error(error(resource_error(_), _)).
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bad_request_error(error(domain_error(http_request, _), _)).
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%% keep_alive(+Reply) is semidet.
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%
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% If true for Reply, the default is to keep the connection open.
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keep_alive(not_modified).
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keep_alive(file(_Type, _File)).
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keep_alive(tmp_file(_Type, _File)).
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keep_alive(stream(_In, _Len)).
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keep_alive(cgi_stream(_In, _Len)).
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/*******************************
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* IDE SUPPORT *
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*******************************/
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% See library('trace/exceptions')
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:- multifile
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prolog:general_exception/2.
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prolog:general_exception(http_reply(_), http_reply(_)).
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prolog:general_exception(http_reply(_,_), http_reply(_,_)).
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