src/lib/psensor_json.c

   1 /*
   2     Copyright (C) 2010-2011 jeanfi@gmail.com
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17     02110-1301 USA
  18 */
  19
  20 #include <string.h>
  21
  22 #include "psensor_json.h"
  23
  24 #define ATT_SENSOR_ID "id"
  25 #define ATT_SENSOR_NAME "name"
  26 #define ATT_SENSOR_TYPE "type"
  27 #define ATT_SENSOR_MIN "min"
  28 #define ATT_SENSOR_MAX "max"
  29 #define ATT_SENSOR_LAST_MEASURE "last_measure"
  30 #define ATT_SENSOR_MEASURES "measures"
  31 #define ATT_MEASURE_VALUE "value"
  32 #define ATT_MEASURE_TIME "time"
  33
  34 static json_object *
  35 measure_to_json_object(struct measure *m)
  36 {
  37         json_object *o = json_object_new_object();
  38
  39         json_object_object_add(o,
  40                                ATT_MEASURE_VALUE,
  41                                json_object_new_double(m->value.d_num));
  42         json_object_object_add(o, ATT_MEASURE_TIME,
  43                                json_object_new_int((m->time).tv_sec));
  44         return o;
  45 }
  46
  47 static json_object *
  48 measures_to_json_object(struct psensor *s)
  49 {
  50         json_object *o;
  51         int i;
  52
  53         o = json_object_new_array();
  54
  55         for (i = 0; i < s->values_max_length; i++)
  56                 if (s->measures[i].time.tv_sec)
  57                         json_object_array_add
  58                                 (o, measure_to_json_object(&s->measures[i]));
  59
  60
  61         return o;
  62 }
  63
  64 static json_object *sensor_to_json(struct psensor *s)
  65 {
  66         json_object *mo, *obj;
  67         struct measure *m;
  68
  69         obj = json_object_new_object();
  70
  71         json_object_object_add(obj,
  72                                ATT_SENSOR_ID,
  73                                json_object_new_string(s->id));
  74         json_object_object_add(obj,
  75                                ATT_SENSOR_NAME,
  76                                json_object_new_string(s->name));
  77         json_object_object_add(obj,
  78                                ATT_SENSOR_TYPE, json_object_new_int(s->type));
  79         json_object_object_add(obj,
  80                                ATT_SENSOR_MIN, json_object_new_double(s->min));
  81         json_object_object_add(obj,
  82                                ATT_SENSOR_MAX, json_object_new_double(s->max));
  83         json_object_object_add(obj,
  84                                ATT_SENSOR_MEASURES,
  85                                measures_to_json_object(s));
  86
  87         m = psensor_get_current_measure(s);
  88         mo = json_object_new_object();
  89         json_object_object_add(mo,
  90                                ATT_MEASURE_VALUE,
  91                                json_object_new_double(m->value.d_num));
  92         json_object_object_add(mo, ATT_MEASURE_TIME,
  93                                json_object_new_int((m->time).tv_sec));
  94         json_object_object_add(obj, ATT_SENSOR_LAST_MEASURE, mo);
  95
  96         return obj;
  97 }
  98
  99 char *sensor_to_json_string(struct psensor *s)
 100 {
 101         char *str;
 102         json_object *obj = sensor_to_json(s);
 103
 104         str = strdup(json_object_to_json_string(obj));
 105
 106         json_object_put(obj);
 107
 108         return str;
 109 }
 110
 111 char *sensors_to_json_string(struct psensor **sensors)
 112 {
 113         struct psensor **sensors_cur;
 114         char *str;
 115         json_object *obj = json_object_new_array();
 116
 117         sensors_cur = sensors;
 118
 119         while (*sensors_cur) {
 120                 struct psensor *s = *sensors_cur;
 121
 122                 json_object_array_add(obj, sensor_to_json(s));
 123
 124                 sensors_cur++;
 125         }
 126
 127         str = strdup(json_object_to_json_string(obj));
 128
 129         json_object_put(obj);
 130
 131         return str;
 132 }
 133