lib/json_print.c

   1 /*
   2  * json_print.c         "print regular or json output, based on json_writer".
   3  *
   4  *             This program is free software; you can redistribute it and/or
   5  *             modify it under the terms of the GNU General Public License
   6  *             as published by the Free Software Foundation; either version
   7  *             2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:    Julien Fortin, <julien@cumulusnetworks.com>
  10  */
  11
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14
  15 #include "utils.h"
  16 #include "json_print.h"
  17
  18 static json_writer_t *_jw;
  19
  20 #define _IS_JSON_CONTEXT(type) ((type & PRINT_JSON || type & PRINT_ANY) && _jw)
  21 #define _IS_FP_CONTEXT(type) (!_jw && (type & PRINT_FP || type & PRINT_ANY))
  22
  23 void new_json_obj(int json)
  24 {
  25         if (json) {
  26                 _jw = jsonw_new(stdout);
  27                 if (!_jw) {
  28                         perror("json object");
  29                         exit(1);
  30                 }
  31                 if (show_pretty)
  32                         jsonw_pretty(_jw, true);
  33                 jsonw_start_array(_jw);
  34         }
  35 }
  36
  37 void delete_json_obj(void)
  38 {
  39         if (_jw) {
  40                 jsonw_end_array(_jw);
  41                 jsonw_destroy(&_jw);
  42         }
  43 }
  44
  45 bool is_json_context(void)
  46 {
  47         return _jw != NULL;
  48 }
  49
  50 json_writer_t *get_json_writer(void)
  51 {
  52         return _jw;
  53 }
  54
  55 void open_json_object(const char *str)
  56 {
  57         if (_IS_JSON_CONTEXT(PRINT_JSON)) {
  58                 if (str)
  59                         jsonw_name(_jw, str);
  60                 jsonw_start_object(_jw);
  61         }
  62 }
  63
  64 void close_json_object(void)
  65 {
  66         if (_IS_JSON_CONTEXT(PRINT_JSON))
  67                 jsonw_end_object(_jw);
  68 }
  69
  70 /*
  71  * Start json array or string array using
  72  * the provided string as json key (if not null)
  73  * or as array delimiter in non-json context.
  74  */
  75 void open_json_array(enum output_type type, const char *str)
  76 {
  77         if (_IS_JSON_CONTEXT(type)) {
  78                 if (str)
  79                         jsonw_name(_jw, str);
  80                 jsonw_start_array(_jw);
  81         } else if (_IS_FP_CONTEXT(type)) {
  82                 printf("%s", str);
  83         }
  84 }
  85
  86 /*
  87  * End json array or string array
  88  */
  89 void close_json_array(enum output_type type, const char *str)
  90 {
  91         if (_IS_JSON_CONTEXT(type)) {
  92                 jsonw_end_array(_jw);
  93         } else if (_IS_FP_CONTEXT(type)) {
  94                 printf("%s", str);
  95         }
  96 }
  97
  98 /*
  99  * pre-processor directive to generate similar
 100  * functions handling different types
 101  */
 102 #define _PRINT_FUNC(type_name, type)                                    \
 103         void print_color_##type_name(enum output_type t,                \
 104                                      enum color_attr color,             \
 105                                      const char *key,                   \
 106                                      const char *fmt,                   \
 107                                      type value)                        \
 108         {                                                               \
 109                 if (_IS_JSON_CONTEXT(t)) {                              \
 110                         if (!key)                                       \
 111                                 jsonw_##type_name(_jw, value);          \
 112                         else                                            \
 113                                 jsonw_##type_name##_field(_jw, key, value); \
 114                 } else if (_IS_FP_CONTEXT(t)) {                         \
 115                         color_fprintf(stdout, color, fmt, value);          \
 116                 }                                                       \
 117         }
 118 _PRINT_FUNC(int, int);
 119 _PRINT_FUNC(hu, unsigned short);
 120 _PRINT_FUNC(uint, uint64_t);
 121 _PRINT_FUNC(lluint, unsigned long long int);
 122 _PRINT_FUNC(float, double);
 123 #undef _PRINT_FUNC
 124
 125 void print_color_string(enum output_type type,
 126                         enum color_attr color,
 127                         const char *key,
 128                         const char *fmt,
 129                         const char *value)
 130 {
 131         if (_IS_JSON_CONTEXT(type)) {
 132                 if (key && !value)
 133                         jsonw_name(_jw, key);
 134                 else if (!key && value)
 135                         jsonw_string(_jw, value);
 136                 else
 137                         jsonw_string_field(_jw, key, value);
 138         } else if (_IS_FP_CONTEXT(type)) {
 139                 color_fprintf(stdout, color, fmt, value);
 140         }
 141 }
 142
 143 /*
 144  * value's type is bool. When using this function in FP context you can't pass
 145  * a value to it, you will need to use "is_json_context()" to have different
 146  * branch for json and regular output. grep -r "print_bool" for example
 147  */
 148 void print_color_bool(enum output_type type,
 149                       enum color_attr color,
 150                       const char *key,
 151                       const char *fmt,
 152                       bool value)
 153 {
 154         if (_IS_JSON_CONTEXT(type)) {
 155                 if (key)
 156                         jsonw_bool_field(_jw, key, value);
 157                 else
 158                         jsonw_bool(_jw, value);
 159         } else if (_IS_FP_CONTEXT(type)) {
 160                 color_fprintf(stdout, color, fmt, value ? "true" : "false");
 161         }
 162 }
 163
 164 /*
 165  * In JSON context uses hardcode %#x format: 42 -> 0x2a
 166  */
 167 void print_color_0xhex(enum output_type type,
 168                        enum color_attr color,
 169                        const char *key,
 170                        const char *fmt,
 171                        unsigned int hex)
 172 {
 173         if (_IS_JSON_CONTEXT(type)) {
 174                 SPRINT_BUF(b1);
 175
 176                 snprintf(b1, sizeof(b1), "%#x", hex);
 177                 print_string(PRINT_JSON, key, NULL, b1);
 178         } else if (_IS_FP_CONTEXT(type)) {
 179                 color_fprintf(stdout, color, fmt, hex);
 180         }
 181 }
 182
 183 void print_color_hex(enum output_type type,
 184                      enum color_attr color,
 185                      const char *key,
 186                      const char *fmt,
 187                      unsigned int hex)
 188 {
 189         if (_IS_JSON_CONTEXT(type)) {
 190                 SPRINT_BUF(b1);
 191
 192                 snprintf(b1, sizeof(b1), "%x", hex);
 193                 if (key)
 194                         jsonw_string_field(_jw, key, b1);
 195                 else
 196                         jsonw_string(_jw, b1);
 197         } else if (_IS_FP_CONTEXT(type)) {
 198                 color_fprintf(stdout, color, fmt, hex);
 199         }
 200 }
 201
 202 /*
 203  * In JSON context we don't use the argument "value" we simply call jsonw_null
 204  * whereas FP context can use "value" to output anything
 205  */
 206 void print_color_null(enum output_type type,
 207                       enum color_attr color,
 208                       const char *key,
 209                       const char *fmt,
 210                       const char *value)
 211 {
 212         if (_IS_JSON_CONTEXT(type)) {
 213                 if (key)
 214                         jsonw_null_field(_jw, key);
 215                 else
 216                         jsonw_null(_jw);
 217         } else if (_IS_FP_CONTEXT(type)) {
 218                 color_fprintf(stdout, color, fmt, value);
 219         }
 220 }