(* Copyright (C) 2002, HELM Team.
*
* 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://cs.unibo.it/helm/.
*)
open Printf;;
(* debugging settings *)
let debug = true;;
let debug_level = `Debug;;
let debug_print s = if debug then prerr_endline s;;
let http_debug = false;;
Http_common.debug := http_debug;;
(* environment settings *)
let daemon_name = "UWOBO OCaml";;
let default_port = 8082;;
let port_env_var = "UWOBO_PORT";;
let port =
try
int_of_string (Sys.getenv port_env_var)
with
| Not_found -> default_port
| Failure "int_of_string" ->
prerr_endline "Warning: invalid port, reverting to default";
default_port
in
(* facilities *)
let pp_error = sprintf "
Error: %s
" in
let invocation_error msg outchan =
(* return an ok (200) http response, which display in html an invocation error
message *)
Http_daemon.respond ~body:(pp_error msg) outchan
in
let bad_request body outchan = (* return a bad request http response *)
Http_daemon.respond_error ~status:(`Client_error `Bad_request) ~body outchan
in
(* values common to all threads *)
let syslogger = new Uwobo_logger.sysLogger ~level:debug_level () in
syslogger#enable;
let styles = new Uwobo_styles.styles in
let styles_mutex = Mutex.create () in
let usage_string = "Help message: not yet written!!" in (* TODO *)
(* thread action *)
let callback req outchan =
try
syslogger#log `Debug (sprintf "Received request: %s" req#path);
(match req#path with
| "/add" ->
(let bindings = req#paramAll "bind" in
if bindings = [] then
invocation_error "No [key,stylesheet] binding provided" outchan
else begin
let log = new Uwobo_logger.processingLogger () in
List.iter
(fun binding -> (* add a binding *)
let pieces = Pcre.split ~pat:"," binding in
match pieces with
| [key; style] ->
log#log (sprintf "adding binding <%s,%s>" key style);
Mutex.lock styles_mutex;
(try
styles#add key style;
with e ->
log#log
(sprintf
"failure while adding <%s,%s>: exception %s"
key style (Printexc.to_string e)));
Mutex.unlock styles_mutex
| _ -> log#log (sprintf "invalid binding %s" binding))
bindings;
Http_daemon.respond ~body:log#asHtml outchan
end)
| "/remove" -> (* TODO this branch is almost identical to "/reload" one *)
(let log = new Uwobo_logger.processingLogger () in
let keys =
try
Pcre.split ~pat:"," (req#param "keys")
with Http_request.Param_not_found _ -> []
in
(match keys with
| [] -> (* no key provided, unload all stylesheets *)
log#log "removing all stylesheets ...";
Mutex.lock styles_mutex;
(try
styles#removeAll
with e ->
log#log
(sprintf
"failure while removing all stylesheets: exception %s"
(Printexc.to_string e)));
Mutex.unlock styles_mutex
| keys ->
List.iter
(fun key -> (* remove a single stylesheet *)
Mutex.lock styles_mutex;
log#log (sprintf "removing stylesheet %s" key);
(try
styles#remove key
with e ->
log#log
(sprintf
"failure while removing stylesheet %s: exception %s"
key (Printexc.to_string e)));
Mutex.unlock styles_mutex)
keys);
Http_daemon.respond ~body:log#asHtml outchan)
| "/list" ->
(let log = new Uwobo_logger.processingLogger () in
log#log "Stylesheet list:";
styles#iterKeys (fun k -> log#log (styles#getInfo k));
Http_daemon.respond ~body:log#asHtml outchan)
| "/reload" -> (* TODO this branch is almost identical to "/remove" one *)
(let log = new Uwobo_logger.processingLogger () in
let keys =
try
Pcre.split ~pat:"," (req#param "keys")
with Http_request.Param_not_found _ -> []
in
(match keys with
| [] -> (* no key provided, reload all stylesheets *)
log#log "reloading all stylesheets ...";
Mutex.lock styles_mutex;
(try
styles#reloadAll
with e ->
log#log
(sprintf
"failure while reloading all stylesheets: exception %s"
(Printexc.to_string e)));
Mutex.unlock styles_mutex
| keys ->
List.iter
(fun key -> (* reload a single stylesheet *)
Mutex.lock styles_mutex;
log#log (sprintf "reloading stylesheet %s" key);
(try
styles#reload key
with e ->
log#log
(sprintf
"failure while reloading stylesheet %s: exception %s"
key (Printexc.to_string e)));
Mutex.unlock styles_mutex)
keys);
Http_daemon.respond ~body:log#asHtml outchan)
| "/apply" ->
(let logger = new Uwobo_logger.processingLogger () in
let xmluri = req#param "xmluri" in
let keys = Pcre.split ~pat:"," (req#param "keys") in
(* notation: "local" parameters are those defined on a per-stylesheet
pasis (i.e. param.key.param=value), "global" parameters are those
defined for all stylesheets (i.e. param.param=value) *)
let is_global_param x = Pcre.pmatch ~pat:"^param(\\.[^.]+){1}$" x in
let is_local_param x = Pcre.pmatch ~pat:"^param(\\.[^.]+){2}$" x in
let is_property x = Pcre.pmatch ~pat:"^prop\\.[^.]+$" x in
let (params, props) =
List.fold_left
(fun (old_params, old_properties) (name, value) ->
match name with
| name when is_global_param name ->
let name = Pcre.replace ~pat:"^param\\." name in
((fun x -> (old_params x) @ [name, value]),
old_properties)
| name when is_local_param name ->
let pieces = Pcre.extract ~pat:"^param\\.([^.]+)\\.(.*)" name in
let (key, name) = (pieces.(1), pieces.(2)) in
((function
| x when x = key -> [name, value] @ (old_params x)
| x -> old_params x),
old_properties)
| name when is_property name ->
let name = Pcre.replace ~pat:"^prop\\." name in
(old_params, ((name, value) :: old_properties))
| _ -> (old_params, old_properties))
((fun _ -> []), []) (* no parameters, no properties *)
req#params
in
Uwobo_engine.apply
~logger ~styles ~keys ~input:xmluri ~params ~props outchan)
| "/help" -> Http_daemon.respond ~body:usage_string outchan
| invalid_request ->
Http_daemon.respond_error ~status:(`Client_error `Bad_request) outchan)
with
| Http_request.Param_not_found attr_name ->
bad_request (sprintf "Parameter '%s' is missing" attr_name) outchan
| exc ->
Http_daemon.respond
~body:(pp_error ("Uncaught exception: " ^ (Printexc.to_string exc)))
outchan
in
(* daemon initialization *)
syslogger#log
`Notice
(sprintf "%s started and listening on port %d" daemon_name port);
syslogger#log `Notice (sprintf "current directory is %s" (Sys.getcwd ()));
Http_daemon.start' ~port ~mode:`Thread callback;
syslogger#log `Notice (sprintf "%s is terminating, bye!" daemon_name)