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/*
This file is part of rt-app - https://launchpad.net/rt-app
Copyright (C) 2010 Giacomo Bagnoli <g.bagnoli@asidev.com>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "rt-app_parse_config.h"
#define PFX "[json] "
#define PFL " "PFX
#define PIN PFX" "
#define JSON_FILE_BUF_SIZE 4096
static inline void
assure_type_is(struct json_object *obj,
struct json_object *parent,
const char *key,
enum json_type type)
{
if (!json_object_is_type(obj, type)) {
log_critical("Invalid type for key %s", key);
log_critical("%s", json_object_to_json_string(parent));
exit(EXIT_INV_CONFIG);
}
}
static inline struct json_object*
get_in_object(struct json_object *where,
const char *what,
boolean nullable)
{
struct json_object *to;
to = json_object_object_get(where, what);
if (is_error(to)) {
log_critical(PFX "Error while parsing config:\n" PFL
"%s", json_tokener_errors[-(unsigned long)to]);
exit(EXIT_INV_CONFIG);
}
if (!nullable && strcmp(json_object_to_json_string(to), "null") == 0) {
log_critical(PFX "Cannot find key %s", what);
exit(EXIT_INV_CONFIG);
}
return to;
}
static inline int
get_int_value_from(struct json_object *where,
const char *key)
{
struct json_object *value;
int i_value;
value = get_in_object(where, key, TRUE);
assure_type_is(value, where, key, json_type_int);
i_value = json_object_get_int(value);
json_object_put(value);
log_debug(PIN "key: %s, value: %d, type <int>", key, i_value);
return i_value;
}
static inline int
get_bool_value_from(struct json_object *where,
const char *key)
{
struct json_object *value;
boolean b_value;
value = get_in_object(where, key, TRUE);
assure_type_is(value, where, key, json_type_boolean);
b_value = json_object_get_boolean(value);
json_object_put(value);
log_debug(PIN "key: %s, value: %d, type <bool>", key, b_value);
return b_value;
}
static inline char*
get_string_value_from(struct json_object *where,
const char *key)
{
struct json_object *value;
char *s_value;
value = get_in_object(where, key, TRUE);
if (!value || json_object_is_type(value, json_type_null)) {
log_debug(PIN "key: %s, value: NULL, type <string>", key);
return NULL;
}
assure_type_is(value, where, key, json_type_string);
s_value = strdup(json_object_get_string(value));
json_object_put(value);
log_debug(PIN "key: %s, value: %s, type <string>", key, s_value);
return s_value;
}
static void
parse_resources(struct json_object *resources, rtapp_options_t *opts)
{
// TODO
}
static void
parse_tasks(struct json_object *tasks, rtapp_options_t *opts)
{
// TODO
}
static void
parse_global(struct json_object *global, rtapp_options_t *opts)
{
char *policy;
log_debug(PFX "Parsing global section");
opts->spacing = get_int_value_from(global, "spacing");
opts->duration = get_int_value_from(global, "duration");
opts->gnuplot = get_bool_value_from(global, "gnuplot");
policy = get_string_value_from(global, "default_policy");
if (string_to_policy(policy, &opts->policy) != 0) {
log_critical(PFX "Invalid policy %s", policy);
exit(EXIT_INV_CONFIG);
}
opts->logdir = get_string_value_from(global, "logdir");
opts->lock_pages = get_bool_value_from(global, "lock_pages");
opts->logbasename = get_string_value_from(global, "log_basename");
#ifdef AQUOSA
opts->fragment = get_int_value_from(global, "fragment");
#endif
}
static void
get_opts_from_json_object(struct json_object *root, rtapp_options_t *opts)
{
struct json_object *global, *tasks, *resources;
if (is_error(root)) {
log_error(PFX "Error while parsing input JSON: %s",
json_tokener_errors[-(unsigned long)root]);
exit(EXIT_INV_CONFIG);
}
log_info(PFX "Successfully parsed input JSON");
log_debug(PFX "root : %s", json_object_to_json_string(root));
global = get_in_object(root, "global", FALSE);
log_debug(PFX "global : %s", json_object_to_json_string(global));
tasks = get_in_object(root, "tasks", FALSE);
log_debug(PFX "tasks : %s", json_object_to_json_string(tasks));
resources = get_in_object(root, "resources", FALSE);
log_debug(PFX "resources: %s", json_object_to_json_string(resources));
parse_resources(resources, opts);
parse_global(global, opts);
parse_tasks(global, opts);
}
void
parse_config_stdin(rtapp_options_t *opts)
{
/* read from stdin until EOF, write to temp file and parse
* as a "normal" config file */
size_t in_length;
char buf[JSON_FILE_BUF_SIZE];
struct json_object *js;
log_info(PFX "Reading JSON config from stdin...");
in_length = fread(buf, sizeof(char), JSON_FILE_BUF_SIZE, stdin);
buf[in_length] = '\0';
js = json_tokener_parse(buf);
get_opts_from_json_object(js, opts);
return;
}
void
parse_config(const char *filename, rtapp_options_t *opts)
{
int done;
char *fn = strdup(filename);
struct json_object *js;
log_info(PFX "Reading JSON config from %s", fn);
js = json_object_from_file(fn);
get_opts_from_json_object(js, opts);
return;
}
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