src/rrd2json.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <pthread.h>
   5 #include <sys/time.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8
   9 #include "log.h"
  10 #include "common.h"
  11 #include "rrd2json.h"
  12
  13 #define HOSTNAME_MAX 1024
  14 char *hostname = "unknown";
  15
  16 void rrd_stats_api_v1_chart(RRDSET *st, BUFFER *wb)
  17 {
  18         pthread_rwlock_rdlock(&st->rwlock);
  19
  20         buffer_sprintf(wb,
  21                 "\t\t{\n"
  22                 "\t\t\t\"id\": \"%s\",\n"
  23                 "\t\t\t\"name\": \"%s\",\n"
  24                 "\t\t\t\"type\": \"%s\",\n"
  25                 "\t\t\t\"family\": \"%s\",\n"
  26                 "\t\t\t\"title\": \"%s\",\n"
  27                 "\t\t\t\"priority\": %ld,\n"
  28                 "\t\t\t\"enabled\": %s,\n"
  29                 "\t\t\t\"units\": \"%s\",\n"
  30                 "\t\t\t\"data_url\": \"/api/v1/data?chart=%s\",\n"
  31                 "\t\t\t\"chart_type\": \"%s\",\n"
  32                 "\t\t\t\"duration\": %ld,\n"
  33                 "\t\t\t\"first_entry\": %lu,\n"
  34                 "\t\t\t\"last_entry\": %lu,\n"
  35                 "\t\t\t\"update_every\": %d,\n"
  36                 "\t\t\t\"dimensions\": {\n"
  37                 , st->id
  38                 , st->name
  39                 , st->type
  40                 , st->family
  41                 , st->title
  42                 , st->priority
  43                 , st->enabled?"true":"false"
  44                 , st->units
  45                 , st->name
  46                 , rrdset_type_name(st->chart_type)
  47                 , st->entries * st->update_every
  48                 , rrdset_first_entry_t(st)
  49                 , rrdset_last_entry_t(st)
  50                 , st->update_every
  51                 );
  52
  53         unsigned long memory = st->memsize;
  54
  55         int c = 0;
  56         RRDDIM *rd;
  57         for(rd = st->dimensions; rd ; rd = rd->next) {
  58                 if(rd->flags & RRDDIM_FLAG_HIDDEN) continue;
  59
  60                 memory += rd->memsize;
  61
  62                 buffer_sprintf(wb,
  63                         "%s"
  64                         "\t\t\t\t\"%s\": { \"name\": \"%s\" }"
  65                         , c?",\n":""
  66                         , rd->id
  67                         , rd->name
  68                         );
  69
  70                 c++;
  71         }
  72
  73         buffer_sprintf(wb,
  74                 "\n\t\t\t}\n"
  75                 "\t\t}"
  76                 );
  77
  78         pthread_rwlock_unlock(&st->rwlock);
  79 }
  80
  81 void rrd_stats_api_v1_charts(BUFFER *wb)
  82 {
  83         long c;
  84         RRDSET *st;
  85
  86         buffer_sprintf(wb, "{\n"
  87                    "\t\"hostname\": \"%s\""
  88                 ",\n\t\"update_every\": %d"
  89                 ",\n\t\"history\": %d"
  90                 ",\n\t\"charts\": {"
  91                 , hostname
  92                 , rrd_update_every
  93                 , rrd_default_history_entries
  94                 );
  95
  96         pthread_rwlock_rdlock(&rrdset_root_rwlock);
  97         for(st = rrdset_root, c = 0; st ; st = st->next) {
  98                 if(st->enabled) {
  99                         if(c) buffer_strcat(wb, ",");
 100                         buffer_strcat(wb, "\n\t\t\"");
 101                         buffer_strcat(wb, st->id);
 102                         buffer_strcat(wb, "\": ");
 103                         rrd_stats_api_v1_chart(st, wb);
 104                         c++;
 105                 }
 106         }
 107         pthread_rwlock_unlock(&rrdset_root_rwlock);
 108
 109         buffer_strcat(wb, "\n\t}\n}\n");
 110 }
 111
 112
 113 unsigned long rrd_stats_one_json(RRDSET *st, char *options, BUFFER *wb)
 114 {
 115         time_t now = time(NULL);
 116
 117         pthread_rwlock_rdlock(&st->rwlock);
 118
 119         buffer_sprintf(wb,
 120                 "\t\t{\n"
 121                 "\t\t\t\"id\": \"%s\",\n"
 122                 "\t\t\t\"name\": \"%s\",\n"
 123                 "\t\t\t\"type\": \"%s\",\n"
 124                 "\t\t\t\"family\": \"%s\",\n"
 125                 "\t\t\t\"title\": \"%s\",\n"
 126                 "\t\t\t\"priority\": %ld,\n"
 127                 "\t\t\t\"enabled\": %d,\n"
 128                 "\t\t\t\"units\": \"%s\",\n"
 129                 "\t\t\t\"url\": \"/data/%s/%s\",\n"
 130                 "\t\t\t\"chart_type\": \"%s\",\n"
 131                 "\t\t\t\"counter\": %ld,\n"
 132                 "\t\t\t\"entries\": %ld,\n"
 133                 "\t\t\t\"first_entry_t\": %lu,\n"
 134                 "\t\t\t\"last_entry\": %ld,\n"
 135                 "\t\t\t\"last_entry_t\": %lu,\n"
 136                 "\t\t\t\"last_entry_secs_ago\": %lu,\n"
 137                 "\t\t\t\"update_every\": %d,\n"
 138                 "\t\t\t\"isdetail\": %d,\n"
 139                 "\t\t\t\"usec_since_last_update\": %llu,\n"
 140                 "\t\t\t\"collected_total\": " TOTAL_NUMBER_FORMAT ",\n"
 141                 "\t\t\t\"last_collected_total\": " TOTAL_NUMBER_FORMAT ",\n"
 142                 "\t\t\t\"dimensions\": [\n"
 143                 , st->id
 144                 , st->name
 145                 , st->type
 146                 , st->family
 147                 , st->title
 148                 , st->priority
 149                 , st->enabled
 150                 , st->units
 151                 , st->name, options?options:""
 152                 , rrdset_type_name(st->chart_type)
 153                 , st->counter
 154                 , st->entries
 155                 , rrdset_first_entry_t(st)
 156                 , rrdset_last_slot(st)
 157                 , rrdset_last_entry_t(st)
 158                 , (now < rrdset_last_entry_t(st)) ? (time_t)0 : now - rrdset_last_entry_t(st)
 159                 , st->update_every
 160                 , st->isdetail
 161                 , st->usec_since_last_update
 162                 , st->collected_total
 163                 , st->last_collected_total
 164                 );
 165
 166         unsigned long memory = st->memsize;
 167
 168         RRDDIM *rd;
 169         for(rd = st->dimensions; rd ; rd = rd->next) {
 170
 171                 memory += rd->memsize;
 172
 173                 buffer_sprintf(wb,
 174                         "\t\t\t\t{\n"
 175                         "\t\t\t\t\t\"id\": \"%s\",\n"
 176                         "\t\t\t\t\t\"name\": \"%s\",\n"
 177                         "\t\t\t\t\t\"entries\": %ld,\n"
 178                         "\t\t\t\t\t\"isHidden\": %d,\n"
 179                         "\t\t\t\t\t\"algorithm\": \"%s\",\n"
 180                         "\t\t\t\t\t\"multiplier\": %ld,\n"
 181                         "\t\t\t\t\t\"divisor\": %ld,\n"
 182                         "\t\t\t\t\t\"last_entry_t\": %lu,\n"
 183                         "\t\t\t\t\t\"collected_value\": " COLLECTED_NUMBER_FORMAT ",\n"
 184                         "\t\t\t\t\t\"calculated_value\": " CALCULATED_NUMBER_FORMAT ",\n"
 185                         "\t\t\t\t\t\"last_collected_value\": " COLLECTED_NUMBER_FORMAT ",\n"
 186                         "\t\t\t\t\t\"last_calculated_value\": " CALCULATED_NUMBER_FORMAT ",\n"
 187                         "\t\t\t\t\t\"memory\": %lu\n"
 188                         "\t\t\t\t}%s\n"
 189                         , rd->id
 190                         , rd->name
 191                         , rd->entries
 192                         , (rd->flags & RRDDIM_FLAG_HIDDEN)?1:0
 193                         , rrddim_algorithm_name(rd->algorithm)
 194                         , rd->multiplier
 195                         , rd->divisor
 196                         , rd->last_collected_time.tv_sec
 197                         , rd->collected_value
 198                         , rd->calculated_value
 199                         , rd->last_collected_value
 200                         , rd->last_calculated_value
 201                         , rd->memsize
 202                         , rd->next?",":""
 203                         );
 204         }
 205
 206         buffer_sprintf(wb,
 207                 "\t\t\t],\n"
 208                 "\t\t\t\"memory\" : %lu\n"
 209                 "\t\t}"
 210                 , memory
 211                 );
 212
 213         pthread_rwlock_unlock(&st->rwlock);
 214         return memory;
 215 }
 216
 217 #define RRD_GRAPH_JSON_HEADER "{\n\t\"charts\": [\n"
 218 #define RRD_GRAPH_JSON_FOOTER "\n\t]\n}\n"
 219
 220 void rrd_stats_graph_json(RRDSET *st, char *options, BUFFER *wb)
 221 {
 222         buffer_strcat(wb, RRD_GRAPH_JSON_HEADER);
 223         rrd_stats_one_json(st, options, wb);
 224         buffer_strcat(wb, RRD_GRAPH_JSON_FOOTER);
 225 }
 226
 227 void rrd_stats_all_json(BUFFER *wb)
 228 {
 229         unsigned long memory = 0;
 230         long c;
 231         RRDSET *st;
 232
 233         buffer_strcat(wb, RRD_GRAPH_JSON_HEADER);
 234
 235         pthread_rwlock_rdlock(&rrdset_root_rwlock);
 236         for(st = rrdset_root, c = 0; st ; st = st->next) {
 237                 if(st->enabled) {
 238                         if(c) buffer_strcat(wb, ",\n");
 239                         memory += rrd_stats_one_json(st, NULL, wb);
 240                         c++;
 241                 }
 242         }
 243         pthread_rwlock_unlock(&rrdset_root_rwlock);
 244
 245         buffer_sprintf(wb, "\n\t],\n"
 246                 "\t\"hostname\": \"%s\",\n"
 247                 "\t\"update_every\": %d,\n"
 248                 "\t\"history\": %d,\n"
 249                 "\t\"memory\": %lu\n"
 250                 "}\n"
 251                 , hostname
 252                 , rrd_update_every
 253                 , rrd_default_history_entries
 254                 , memory
 255                 );
 256 }
 257
 258
 259
 260 // ----------------------------------------------------------------------------
 261
 262 // RRDR options
 263 #define RRDR_EMPTY      0x01 // the dimension contains / the value is empty (null)
 264 #define RRDR_RESET      0x02 // the dimension contains / the value is reset
 265 #define RRDR_HIDDEN     0x04 // the dimension contains / the value is hidden
 266 #define RRDR_NONZERO    0x08 // the dimension contains / the value is non-zero
 267
 268
 269 typedef struct rrdresult {
 270         RRDSET *st;                     // the chart this result refers to
 271
 272         int d;                                  // the number of dimensions
 273         int n;                                  // the number of values in the arrays
 274         int rows;                       // the number of rows used
 275
 276         uint8_t *od;                    // the options for the dimensions
 277
 278         time_t *t;                              // array of n timestamps
 279         calculated_number *v;   // array n x d values
 280         uint8_t *o;                             // array n x d options
 281
 282         int c;                                  // current line ( -1 ~ n ), ( -1 = none, use rrdr_rows() to get number of rows )
 283
 284         int group;                              // how many collected values were grouped for each row
 285         int update_every;               // what is the suggested update frequency in seconds
 286
 287         calculated_number min;
 288         calculated_number max;
 289
 290         time_t before;
 291         time_t after;
 292
 293         int has_st_lock;                // if st is read locked by us
 294 } RRDR;
 295
 296 #define rrdr_rows(r) ((r)->rows)
 297
 298 /*
 299 static void rrdr_dump(RRDR *r)
 300 {
 301         long c, i;
 302         RRDDIM *d;
 303
 304         fprintf(stderr, "\nCHART %s (%s)\n", r->st->id, r->st->name);
 305
 306         for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 307                 fprintf(stderr, "DIMENSION %s (%s), %s%s%s%s\n"
 308                                 , d->id
 309                                 , d->name
 310                                 , (r->od[c] & RRDR_EMPTY)?"EMPTY ":""
 311                                 , (r->od[c] & RRDR_RESET)?"RESET ":""
 312                                 , (r->od[c] & RRDR_HIDDEN)?"HIDDEN ":""
 313                                 , (r->od[c] & RRDR_NONZERO)?"NONZERO ":""
 314                                 );
 315         }
 316
 317         if(r->rows <= 0) {
 318                 fprintf(stderr, "RRDR does not have any values in it.\n");
 319                 return;
 320         }
 321
 322         fprintf(stderr, "RRDR includes %d values in it:\n", r->rows);
 323
 324         // for each line in the array
 325         for(i = 0; i < r->rows ;i++) {
 326                 calculated_number *cn = &r->v[ i * r->d ];
 327                 uint8_t *co = &r->o[ i * r->d ];
 328
 329                 // print the id and the timestamp of the line
 330                 fprintf(stderr, "%ld %ld ", i + 1, r->t[i]);
 331
 332                 // for each dimension
 333                 for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 334                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 335                         if(unlikely(!(r->od[c] & RRDR_NONZERO))) continue;
 336
 337                         if(co[c] & RRDR_EMPTY)
 338                                 fprintf(stderr, "null ");
 339                         else
 340                                 fprintf(stderr, CALCULATED_NUMBER_FORMAT " %s%s%s%s "
 341                                         , cn[c]
 342                                         , (co[c] & RRDR_EMPTY)?"E":" "
 343                                         , (co[c] & RRDR_RESET)?"R":" "
 344                                         , (co[c] & RRDR_HIDDEN)?"H":" "
 345                                         , (co[c] & RRDR_NONZERO)?"N":" "
 346                                         );
 347                 }
 348
 349                 fprintf(stderr, "\n");
 350         }
 351 }
 352 */
 353
 354 void rrdr_disable_not_selected_dimensions(RRDR *r, const char *dims)
 355 {
 356         char b[strlen(dims) + 1];
 357         char *o = b, *tok;
 358         strcpy(o, dims);
 359
 360         long c;
 361         RRDDIM *d;
 362
 363         // disable all of them
 364         for(c = 0, d = r->st->dimensions; d ;c++, d = d->next)
 365                 r->od[c] |= RRDR_HIDDEN;
 366
 367         while(o && *o && (tok = mystrsep(&o, ", |"))) {
 368                 if(!*tok) continue;
 369
 370                 // find it and enable it
 371                 for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 372                         if(!strcmp(d->name, tok)) {
 373                                 r->od[c] &= ~RRDR_HIDDEN;
 374                         }
 375                 }
 376         }
 377 }
 378
 379 void rrdr_buffer_print_format(BUFFER *wb, uint32_t format)
 380 {
 381         switch(format) {
 382         case DATASOURCE_JSON:
 383                 buffer_strcat(wb, DATASOURCE_FORMAT_JSON);
 384                 break;
 385
 386         case DATASOURCE_DATATABLE_JSON:
 387                 buffer_strcat(wb, DATASOURCE_FORMAT_DATATABLE_JSON);
 388                 break;
 389
 390         case DATASOURCE_DATATABLE_JSONP:
 391                 buffer_strcat(wb, DATASOURCE_FORMAT_DATATABLE_JSONP);
 392                 break;
 393
 394         case DATASOURCE_JSONP:
 395                 buffer_strcat(wb, DATASOURCE_FORMAT_JSONP);
 396                 break;
 397
 398         case DATASOURCE_SSV:
 399                 buffer_strcat(wb, DATASOURCE_FORMAT_SSV);
 400                 break;
 401
 402         case DATASOURCE_CSV:
 403                 buffer_strcat(wb, DATASOURCE_FORMAT_CSV);
 404                 break;
 405
 406         case DATASOURCE_TSV:
 407                 buffer_strcat(wb, DATASOURCE_FORMAT_TSV);
 408                 break;
 409
 410         case DATASOURCE_HTML:
 411                 buffer_strcat(wb, DATASOURCE_FORMAT_HTML);
 412                 break;
 413
 414         case DATASOURCE_JS_ARRAY:
 415                 buffer_strcat(wb, DATASOURCE_FORMAT_JS_ARRAY);
 416                 break;
 417
 418         case DATASOURCE_SSV_COMMA:
 419                 buffer_strcat(wb, DATASOURCE_FORMAT_SSV_COMMA);
 420                 break;
 421
 422         default:
 423                 buffer_strcat(wb, "unknown");
 424                 break;
 425         }
 426 }
 427
 428 uint32_t rrdr_check_options(RRDR *r, uint32_t options)
 429 {
 430         if(options & RRDR_OPTION_NONZERO) {
 431                 long c, i;
 432                 RRDDIM *rd;
 433
 434                 // find how many dimensions are not zero
 435                 for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ; c++, rd = rd->next) {
 436                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 437                         if(unlikely(!(r->od[c] & RRDR_NONZERO))) continue;
 438                         i++;
 439                 }
 440
 441                 // if with nonzero we get i = 0
 442                 // but c != 0, then disable nonzero
 443                 // to show all dimensions
 444                 if(!i) options &= ~RRDR_OPTION_NONZERO;
 445         }
 446
 447         return options;
 448 }
 449
 450 void rrdr_json_wrapper_begin(RRDR *r, BUFFER *wb, uint32_t format, uint32_t options, int string_value)
 451 {
 452         int rows = rrdr_rows(r);
 453         long c, i;
 454         RRDDIM *rd;
 455
 456         //info("JSONWRAPPER(): %s: BEGIN", r->st->id);
 457         char kq[2] = "",                                        // key quote
 458                 sq[2] = "";                                             // string quote
 459
 460         if( options & RRDR_OPTION_GOOGLE_JSON ) {
 461                 kq[0] = '\0';
 462                 sq[0] = '\'';
 463         }
 464         else {
 465                 kq[0] = '"';
 466                 sq[0] = '"';
 467         }
 468
 469         buffer_sprintf(wb, "{\n"
 470                         "       %sapi%s: 1,\n"
 471                         "       %sid%s: %s%s%s,\n"
 472                         "       %sname%s: %s%s%s,\n"
 473                         "       %sview_update_every%s: %d,\n"
 474                         "       %supdate_every%s: %d,\n"
 475                         "       %sfirst_entry_t%s: %u,\n"
 476                         "       %slast_entry_t%s: %u,\n"
 477                         "       %smin%s: "
 478                         , kq, kq
 479                         , kq, kq, sq, r->st->id, sq
 480                         , kq, kq, sq, r->st->name, sq
 481                         , kq, kq, r->update_every
 482                         , kq, kq, r->st->update_every
 483                         , kq, kq, rrdset_first_entry_t(r->st)
 484                         , kq, kq, rrdset_last_entry_t(r->st)
 485                         , kq, kq);
 486
 487         buffer_rrd_value(wb, r->min);
 488         buffer_sprintf(wb, ",\n %smax%s: ", kq, kq);
 489         buffer_rrd_value(wb, r->max);
 490         buffer_sprintf(wb, ",\n"
 491                         "       %sbefore%s: %u,\n"
 492                         "       %safter%s: %u,\n"
 493                         "       %sdimension_names%s: ["
 494                         , kq, kq, r->before
 495                         , kq, kq, r->after
 496                         , kq, kq);
 497
 498         for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
 499                 if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 500                 if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 501
 502                 if(i) buffer_strcat(wb, ", ");
 503                 buffer_strcat(wb, sq);
 504                 buffer_strcat(wb, rd->name);
 505                 buffer_strcat(wb, sq);
 506                 i++;
 507         }
 508         if(!i) {
 509 #ifdef NETDATA_INTERNAL_CHECKS
 510                 error("RRDR is empty for %s (RRDR has %d dimensions, options is 0x%08x)", r->st->id, r->d, options);
 511 #endif
 512                 rows = 0;
 513                 buffer_strcat(wb, sq);
 514                 buffer_strcat(wb, "no data");
 515                 buffer_strcat(wb, sq);
 516         }
 517
 518         buffer_sprintf(wb, "],\n"
 519                         "       %sdimension_ids%s: ["
 520                         , kq, kq);
 521
 522         for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
 523                 if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 524                 if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 525
 526                 if(i) buffer_strcat(wb, ", ");
 527                 buffer_strcat(wb, sq);
 528                 buffer_strcat(wb, rd->id);
 529                 buffer_strcat(wb, sq);
 530                 i++;
 531         }
 532         if(!i) {
 533                 rows = 0;
 534                 buffer_strcat(wb, sq);
 535                 buffer_strcat(wb, "no data");
 536                 buffer_strcat(wb, sq);
 537         }
 538
 539         buffer_sprintf(wb, "],\n"
 540                         "       %slatest_values%s: ["
 541                         , kq, kq);
 542
 543         for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
 544                 if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 545                 if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 546
 547                 if(i) buffer_strcat(wb, ", ");
 548                 i++;
 549
 550                 storage_number n = rd->values[rrdset_last_slot(r->st)];
 551
 552                 if(!does_storage_number_exist(n))
 553                         buffer_strcat(wb, "null");
 554                 else
 555                         buffer_rrd_value(wb, unpack_storage_number(n));
 556         }
 557         if(!i) {
 558                 rows = 0;
 559                 buffer_strcat(wb, "null");
 560         }
 561
 562         buffer_sprintf(wb, "],\n"
 563                         "       %sresult_latest_values%s: ["
 564                         , kq, kq);
 565
 566         i = 0;
 567         if(rows) {
 568                 for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
 569                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 570                         if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 571
 572                         if(i) buffer_strcat(wb, ", ");
 573                         i++;
 574
 575                         calculated_number *cn = &r->v[ (0) * r->d ];
 576                         uint8_t *co = &r->o[ (0) * r->d ];
 577
 578                         if(co[c] & RRDR_EMPTY)
 579                                 buffer_strcat(wb, "null");
 580                         else
 581                                 buffer_rrd_value(wb, cn[c]);
 582                 }
 583         }
 584         if(!i) {
 585                 rows = 0;
 586                 buffer_strcat(wb, "null");
 587         }
 588
 589         buffer_sprintf(wb, "],\n"
 590                         "       %sdimensions%s: %d,\n"
 591                         "       %spoints%s: %d,\n"
 592                         "       %sformat%s: %s"
 593                         , kq, kq, i
 594                         , kq, kq, rows
 595                         , kq, kq, sq
 596                         );
 597
 598         rrdr_buffer_print_format(wb, format);
 599
 600         buffer_sprintf(wb, "%s,\n"
 601                         "       %sresult%s: "
 602                         , sq
 603                         , kq, kq
 604                         );
 605
 606         if(string_value) buffer_strcat(wb, sq);
 607         //info("JSONWRAPPER(): %s: END", r->st->id);
 608 }
 609
 610 void rrdr_json_wrapper_end(RRDR *r, BUFFER *wb, uint32_t format, uint32_t options, int string_value)
 611 {
 612         if(r) {;}
 613         if(format) {;}
 614
 615         char sq[2] = "";                                                // string quote
 616
 617         if( options & RRDR_OPTION_GOOGLE_JSON )
 618                 sq[0] = '\'';
 619         else
 620                 sq[0] = '"';
 621
 622         if(string_value) buffer_strcat(wb, sq);
 623         buffer_strcat(wb, "\n}\n");
 624 }
 625
 626 #define JSON_DATES_JS 1
 627 #define JSON_DATES_TIMESTAMP 2
 628
 629 static void rrdr2json(RRDR *r, BUFFER *wb, uint32_t options, int datatable)
 630 {
 631         //info("RRD2JSON(): %s: BEGIN", r->st->id);
 632         int row_annotations = 0, dates = JSON_DATES_JS, dates_with_new = 0;
 633         char kq[2] = "",                                        // key quote
 634                 sq[2] = "",                                             // string quote
 635                 pre_label[101] = "",                    // before each label
 636                 post_label[101] = "",                   // after each label
 637                 pre_date[101] = "",                             // the beginning of line, to the date
 638                 post_date[101] = "",                    // closing the date
 639                 pre_value[101] = "",                    // before each value
 640                 post_value[101] = "",                   // after each value
 641                 post_line[101] = "",                    // at the end of each row
 642                 normal_annotation[201] = "",    // default row annotation
 643                 overflow_annotation[201] = "",  // overflow row annotation
 644                 data_begin[101] = "",                   // between labels and values
 645                 finish[101] = "";                               // at the end of everything
 646
 647         if(datatable) {
 648                 dates = JSON_DATES_JS;
 649                 if( options & RRDR_OPTION_GOOGLE_JSON ) {
 650                         kq[0] = '\0';
 651                         sq[0] = '\'';
 652                 }
 653                 else {
 654                         kq[0] = '"';
 655                         sq[0] = '"';
 656                 }
 657                 row_annotations = 1;
 658                 snprintf(pre_date,   100, "             {%sc%s:[{%sv%s:%s", kq, kq, kq, kq, sq);
 659                 snprintf(post_date,  100, "%s}", sq);
 660                 snprintf(pre_label,  100, ",\n          {%sid%s:%s%s,%slabel%s:%s", kq, kq, sq, sq, kq, kq, sq);
 661                 snprintf(post_label, 100, "%s,%spattern%s:%s%s,%stype%s:%snumber%s}", sq, kq, kq, sq, sq, kq, kq, sq, sq);
 662                 snprintf(pre_value,  100, ",{%sv%s:", kq, kq);
 663                 snprintf(post_value, 100, "}");
 664                 snprintf(post_line,  100, "]}");
 665                 snprintf(data_begin, 100, "\n   ],\n    %srows%s:\n     [\n", kq, kq);
 666                 snprintf(finish,     100, "\n   ]\n}\n");
 667
 668                 snprintf(overflow_annotation, 200, ",{%sv%s:%sRESET OR OVERFLOW%s},{%sv%s:%sThe counters have been wrapped.%s}", kq, kq, sq, sq, kq, kq, sq, sq);
 669                 snprintf(normal_annotation,   200, ",{%sv%s:null},{%sv%s:null}", kq, kq, kq, kq);
 670
 671                 buffer_sprintf(wb, "{\n %scols%s:\n     [\n", kq, kq, kq, kq);
 672                 buffer_sprintf(wb, "            {%sid%s:%s%s,%slabel%s:%stime%s,%spattern%s:%s%s,%stype%s:%sdatetime%s},\n", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq);
 673                 buffer_sprintf(wb, "            {%sid%s:%s%s,%slabel%s:%s%s,%spattern%s:%s%s,%stype%s:%sstring%s,%sp%s:{%srole%s:%sannotation%s}},\n", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, kq, kq, sq, sq);
 674                 buffer_sprintf(wb, "            {%sid%s:%s%s,%slabel%s:%s%s,%spattern%s:%s%s,%stype%s:%sstring%s,%sp%s:{%srole%s:%sannotationText%s}}", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, kq, kq, sq, sq);
 675
 676                 // remove the valueobjects flag
 677                 // google wants its own keys
 678                 if(options & RRDR_OPTION_OBJECTSROWS)
 679                         options &= ~RRDR_OPTION_OBJECTSROWS;
 680         }
 681         else {
 682                 kq[0] = '"';
 683                 sq[0] = '"';
 684                 if((options & RRDR_OPTION_SECONDS) || (options & RRDR_OPTION_MILLISECONDS)) {
 685                         dates = JSON_DATES_TIMESTAMP;
 686                         dates_with_new = 0;
 687                 }
 688                 else {
 689                         dates = JSON_DATES_JS;
 690                         dates_with_new = 1;
 691                 }
 692                 if( options & RRDR_OPTION_OBJECTSROWS )
 693                         snprintf(pre_date,   100, "             { ");
 694                 else
 695                         snprintf(pre_date,   100, "             [ ");
 696                 snprintf(pre_label,  100, ", \"");
 697                 snprintf(post_label, 100, "\"");
 698                 snprintf(pre_value,  100, ", ");
 699                 if( options & RRDR_OPTION_OBJECTSROWS )
 700                         snprintf(post_line,  100, "}");
 701                 else
 702                         snprintf(post_line,  100, "]");
 703                 snprintf(data_begin, 100, "],\n %sdata%s:\n     [\n", kq, kq);
 704                 snprintf(finish,     100, "\n   ]\n}\n");
 705
 706                 buffer_sprintf(wb, "{\n %slabels%s: [", kq, kq);
 707                 buffer_sprintf(wb, "%stime%s", sq, sq);
 708         }
 709
 710         // -------------------------------------------------------------------------
 711         // print the JSON header
 712
 713         long c, i;
 714         RRDDIM *rd;
 715
 716         // print the header lines
 717         for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
 718                 if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 719                 if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 720
 721                 buffer_strcat(wb, pre_label);
 722                 buffer_strcat(wb, rd->name);
 723                 buffer_strcat(wb, post_label);
 724                 i++;
 725         }
 726         if(!i) {
 727                 buffer_strcat(wb, pre_label);
 728                 buffer_strcat(wb, "no data");
 729                 buffer_strcat(wb, post_label);
 730         }
 731
 732         // print the begin of row data
 733         buffer_strcat(wb, data_begin);
 734
 735         // if all dimensions are hidden, print a null
 736         if(!i) {
 737                 buffer_strcat(wb, finish);
 738                 return;
 739         }
 740
 741         long start = 0, end = rrdr_rows(r), step = 1;
 742         if((options & RRDR_OPTION_REVERSED)) {
 743                 start = rrdr_rows(r) - 1;
 744                 end = -1;
 745                 step = -1;
 746         }
 747
 748         // for each line in the array
 749         for(i = start; i != end ;i += step) {
 750                 calculated_number *cn = &r->v[ i * r->d ];
 751                 uint8_t *co = &r->o[ i * r->d ];
 752
 753                 time_t now = r->t[i];
 754
 755                 if(dates == JSON_DATES_JS) {
 756                         // generate the local date time
 757                         struct tm tmbuf, *tm = localtime_r(&now, &tmbuf);
 758                         if(!tm) { error("localtime_r() failed."); continue; }
 759
 760                         if(likely(i != start)) buffer_strcat(wb, ",\n");
 761                         buffer_strcat(wb, pre_date);
 762
 763                         if( options & RRDR_OPTION_OBJECTSROWS )
 764                                 buffer_sprintf(wb, "%stime%s: ", kq, kq);
 765
 766                         if(dates_with_new)
 767                                 buffer_strcat(wb, "new ");
 768
 769                         buffer_jsdate(wb, tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
 770
 771                         buffer_strcat(wb, post_date);
 772
 773                         if(row_annotations) {
 774                                 // google supports one annotation per row
 775                                 int annotation_found = 0;
 776                                 for(c = 0, rd = r->st->dimensions; rd ;c++, rd = rd->next) {
 777                                         if(co[c] & RRDR_RESET) {
 778                                                 buffer_strcat(wb, overflow_annotation);
 779                                                 annotation_found = 1;
 780                                                 break;
 781                                         }
 782                                 }
 783                                 if(!annotation_found)
 784                                         buffer_strcat(wb, normal_annotation);
 785                         }
 786                 }
 787                 else {
 788                         // print the timestamp of the line
 789                         if(likely(i != start)) buffer_strcat(wb, ",\n");
 790                         buffer_strcat(wb, pre_date);
 791
 792                         if( options & RRDR_OPTION_OBJECTSROWS )
 793                                 buffer_sprintf(wb, "%stime%s: ", kq, kq);
 794
 795                         buffer_rrd_value(wb, (calculated_number)r->t[i]);
 796                         // in ms
 797                         if(options & RRDR_OPTION_MILLISECONDS) buffer_strcat(wb, "000");
 798
 799                         buffer_strcat(wb, post_date);
 800                 }
 801
 802                 // for each dimension
 803                 for(c = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
 804                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 805                         if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 806
 807                         calculated_number n = cn[c];
 808
 809                         buffer_strcat(wb, pre_value);
 810
 811                         if( options & RRDR_OPTION_OBJECTSROWS )
 812                                 buffer_sprintf(wb, "%s%s%s: ", kq, rd->name, kq);
 813
 814                         if(co[c] & RRDR_EMPTY) {
 815                                 if(options & RRDR_OPTION_NULL2ZERO)
 816                                         buffer_strcat(wb, "0");
 817                                 else
 818                                         buffer_strcat(wb, "null");
 819                         }
 820                         else if((options & RRDR_OPTION_ABSOLUTE))
 821                                 buffer_rrd_value(wb, (n<0)?-n:n);
 822                         else
 823                                 buffer_rrd_value(wb, n);
 824
 825                         buffer_strcat(wb, post_value);
 826                 }
 827
 828                 buffer_strcat(wb, post_line);
 829         }
 830
 831         buffer_strcat(wb, finish);
 832         //info("RRD2JSON(): %s: END", r->st->id);
 833 }
 834
 835 static void rrdr2csv(RRDR *r, BUFFER *wb, uint32_t options, const char *startline, const char *separator, const char *endline)
 836 {
 837         //info("RRD2CSV(): %s: BEGIN", r->st->id);
 838         long c, i;
 839         RRDDIM *d;
 840
 841         // print the csv header
 842         for(c = 0, i = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
 843                 if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 844                 if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 845
 846                 if(!i) {
 847                         buffer_strcat(wb, startline);
 848                         buffer_strcat(wb, "time");
 849                 }
 850                 buffer_strcat(wb, separator);
 851                 buffer_strcat(wb, d->name);
 852                 i++;
 853         }
 854         buffer_strcat(wb, endline);
 855
 856         if(!i) {
 857                 // no dimensions present
 858                 return;
 859         }
 860
 861         long start = 0, end = rrdr_rows(r), step = 1;
 862         if((options & RRDR_OPTION_REVERSED)) {
 863                 start = rrdr_rows(r) - 1;
 864                 end = -1;
 865                 step = -1;
 866         }
 867
 868         // for each line in the array
 869         for(i = start; i != end ;i += step) {
 870                 calculated_number *cn = &r->v[ i * r->d ];
 871                 uint8_t *co = &r->o[ i * r->d ];
 872
 873                 buffer_strcat(wb, startline);
 874
 875                 time_t now = r->t[i];
 876
 877                 if((options & RRDR_OPTION_SECONDS) || (options & RRDR_OPTION_MILLISECONDS)) {
 878                         // print the timestamp of the line
 879                         buffer_rrd_value(wb, (calculated_number)now);
 880                         // in ms
 881                         if(options & RRDR_OPTION_MILLISECONDS) buffer_strcat(wb, "000");
 882                 }
 883                 else {
 884                         // generate the local date time
 885                         struct tm tmbuf, *tm = localtime_r(&now, &tmbuf);
 886                         if(!tm) { error("localtime() failed."); continue; }
 887                         buffer_date(wb, tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
 888                 }
 889
 890                 // for each dimension
 891                 for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
 892                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 893                         if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 894
 895                         buffer_strcat(wb, separator);
 896
 897                         calculated_number n = cn[c];
 898
 899                         if(co[c] & RRDR_EMPTY) {
 900                                 if(options & RRDR_OPTION_NULL2ZERO)
 901                                         buffer_strcat(wb, "0");
 902                                 else
 903                                         buffer_strcat(wb, "null");
 904                         }
 905                         else if((options & RRDR_OPTION_ABSOLUTE))
 906                                 buffer_rrd_value(wb, (n<0)?-n:n);
 907                         else
 908                                 buffer_rrd_value(wb, n);
 909                 }
 910
 911                 buffer_strcat(wb, endline);
 912         }
 913         //info("RRD2CSV(): %s: END", r->st->id);
 914 }
 915
 916 static void rrdr2ssv(RRDR *r, BUFFER *wb, uint32_t options, const char *prefix, const char *separator, const char *suffix)
 917 {
 918         //info("RRD2SSV(): %s: BEGIN", r->st->id);
 919         long c, i;
 920         RRDDIM *d;
 921
 922         buffer_strcat(wb, prefix);
 923         long start = 0, end = rrdr_rows(r), step = 1;
 924         if((options & RRDR_OPTION_REVERSED)) {
 925                 start = rrdr_rows(r) - 1;
 926                 end = -1;
 927                 step = -1;
 928         }
 929
 930         // for each line in the array
 931         for(i = start; i != end ;i += step) {
 932
 933                 calculated_number *cn = &r->v[ i * r->d ];
 934                 uint8_t *co = &r->o[ i * r->d ];
 935
 936                 calculated_number sum = 0, min = 0, max = 0;
 937                 int all_null = 1, init = 1;
 938
 939                 // for each dimension
 940                 for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
 941                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 942                         if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 943
 944                         calculated_number n = cn[c];
 945
 946                         if(unlikely(init)) {
 947                                 if(n > 0) {
 948                                         min = 0;
 949                                         max = n;
 950                                 }
 951                                 else {
 952                                         min = n;
 953                                         max = 0;
 954                                 }
 955                                 init = 0;
 956                         }
 957
 958                         if(likely(!(co[c] & RRDR_EMPTY))) {
 959                                 all_null = 0;
 960                                 if((options & RRDR_OPTION_ABSOLUTE) && n < 0) n = -n;
 961                                 sum += n;
 962                         }
 963
 964                         if(n < min) min = n;
 965                         if(n > max) max = n;
 966                 }
 967
 968                 if(likely(i != start))
 969                         buffer_strcat(wb, separator);
 970
 971                 if(all_null) {
 972                         if(options & RRDR_OPTION_NULL2ZERO)
 973                                 buffer_strcat(wb, "0");
 974                         else
 975                                 buffer_strcat(wb, "null");
 976                 }
 977                 else if(options & RRDR_OPTION_MIN2MAX)
 978                         buffer_rrd_value(wb, max - min);
 979                 else
 980                         buffer_rrd_value(wb, sum);
 981         }
 982         buffer_strcat(wb, suffix);
 983         //info("RRD2SSV(): %s: END", r->st->id);
 984 }
 985
 986 inline static calculated_number *rrdr_line_values(RRDR *r)
 987 {
 988         return &r->v[ r->c * r->d ];
 989 }
 990
 991 inline static uint8_t *rrdr_line_options(RRDR *r)
 992 {
 993         return &r->o[ r->c * r->d ];
 994 }
 995
 996 inline static int rrdr_line_init(RRDR *r, time_t t)
 997 {
 998         r->c++;
 999
1000         if(unlikely(r->c >= r->n)) {
1001                 error("requested to step above RRDR size for chart %s", r->st->name);
1002                 r->c = r->n - 1;
1003         }
1004
1005         // save the time
1006         r->t[r->c] = t;
1007
1008         return 1;
1009 }
1010
1011 inline static void rrdr_lock_rrdset(RRDR *r) {
1012         if(unlikely(!r)) {
1013                 error("NULL value given!");
1014                 return;
1015         }
1016
1017         pthread_rwlock_rdlock(&r->st->rwlock);
1018         r->has_st_lock = 1;
1019 }
1020
1021 inline static void rrdr_unlock_rrdset(RRDR *r) {
1022         if(unlikely(!r)) {
1023                 error("NULL value given!");
1024                 return;
1025         }
1026
1027         if(likely(r->has_st_lock)) {
1028                 pthread_rwlock_unlock(&r->st->rwlock);
1029                 r->has_st_lock = 0;
1030         }
1031 }
1032
1033 inline static void rrdr_free(RRDR *r)
1034 {
1035         if(unlikely(!r)) {
1036                 error("NULL value given!");
1037                 return;
1038         }
1039
1040         rrdr_unlock_rrdset(r);
1041         if(likely(r->t)) free(r->t);
1042         if(likely(r->v)) free(r->v);
1043         if(likely(r->o)) free(r->o);
1044         if(likely(r->od)) free(r->od);
1045         free(r);
1046 }
1047
1048 inline void rrdr_done(RRDR *r)
1049 {
1050         r->rows = r->c + 1;
1051         r->c = 0;
1052 }
1053
1054 static RRDR *rrdr_create(RRDSET *st, int n)
1055 {
1056         if(unlikely(!st)) {
1057                 error("NULL value given!");
1058                 return NULL;
1059         }
1060
1061         RRDR *r = calloc(1, sizeof(RRDR));
1062         if(unlikely(!r)) goto cleanup;
1063
1064         r->st = st;
1065
1066         rrdr_lock_rrdset(r);
1067
1068         RRDDIM *rd;
1069         for(rd = st->dimensions ; rd ; rd = rd->next) r->d++;
1070
1071         r->n = n;
1072
1073         r->t = malloc(n * sizeof(time_t));
1074         if(unlikely(!r->t)) goto cleanup;
1075
1076         r->v = malloc(n * r->d * sizeof(calculated_number));
1077         if(unlikely(!r->v)) goto cleanup;
1078
1079         r->o = malloc(n * r->d * sizeof(uint8_t));
1080         if(unlikely(!r->o)) goto cleanup;
1081
1082         r->od = malloc(r->d * sizeof(uint8_t));
1083         if(unlikely(!r->od)) goto cleanup;
1084
1085         r->c = -1;
1086
1087         r->group = 1;
1088         r->update_every = 1;
1089
1090         return r;
1091
1092 cleanup:
1093         error("Cannot allocate RRDR memory for %d entries", n);
1094         if(likely(r)) rrdr_free(r);
1095         return NULL;
1096 }
1097
1098 RRDR *rrd2rrdr(RRDSET *st, long points, long long after, long long before, int group_method)
1099 {
1100         int debug = st->debug;
1101
1102         time_t first_entry_t = rrdset_first_entry_t(st);
1103         time_t last_entry_t = rrdset_last_entry_t(st);
1104
1105         if(before == 0 && after == 0) {
1106                 before = last_entry_t;
1107                 after = first_entry_t;
1108         }
1109
1110         // allow relative for before and after
1111         if(before <= st->update_every * st->entries)
1112                 before = last_entry_t + before;
1113
1114         if(after <= st->update_every * st->entries)
1115                 after = last_entry_t + after;
1116
1117         // make sure they are within our timeframe
1118         if(before > last_entry_t) before = last_entry_t;
1119         if(before < first_entry_t) before = first_entry_t;
1120
1121         if(after > last_entry_t) after = last_entry_t;
1122         if(after < first_entry_t) after = first_entry_t;
1123
1124         // check if they are upside down
1125         if(after > before) {
1126                 time_t tmp = before;
1127                 before = after;
1128                 after = tmp;
1129         }
1130
1131         // the duration of the chart
1132         time_t duration = before - after;
1133         long available_points = duration / st->update_every;
1134
1135         if(duration <= 0 || available_points <= 0)
1136                 return rrdr_create(st, 1);
1137
1138         // check the wanted points
1139         if(points < 0) points = -points;
1140         if(points > available_points) points = available_points;
1141         if(points == 0) points = available_points;
1142
1143         // calculate proper grouping of source data
1144         long group = available_points / points;
1145         if(group <= 0) group = 1;
1146
1147         // round group to the closest integer
1148         if(available_points % points > points / 2) group++;
1149
1150         time_t after_new = after - (after % (group * st->update_every));
1151         time_t before_new = before - (before % (group * st->update_every));
1152         long points_new = (before_new - after_new) / st->update_every / group;
1153
1154         // find the starting and ending slots in our round robin db
1155         long    start_at_slot = rrdset_time2slot(st, before_new),
1156                         stop_at_slot = rrdset_time2slot(st, after_new);
1157
1158 #ifdef NETDATA_INTERNAL_CHECKS
1159         if(after_new < first_entry_t) {
1160                 error("after_new %u is too small, minimum %u", after_new, first_entry_t);
1161         }
1162         if(after_new > last_entry_t) {
1163                 error("after_new %u is too big, maximum %u", after_new, last_entry_t);
1164         }
1165         if(before_new < first_entry_t) {
1166                 error("before_new %u is too small, minimum %u", before_new, first_entry_t);
1167         }
1168         if(before_new > last_entry_t) {
1169                 error("before_new %u is too big, maximum %u", before_new, last_entry_t);
1170         }
1171         if(start_at_slot < 0 || start_at_slot >= st->entries) {
1172                 error("start_at_slot is invalid %ld, expected %ld to %ld", start_at_slot, 0, st->entries - 1);
1173         }
1174         if(stop_at_slot < 0 || stop_at_slot >= st->entries) {
1175                 error("stop_at_slot is invalid %ld, expected %ld to %ld", stop_at_slot, 0, st->entries - 1);
1176         }
1177         if(points_new > (before_new - after_new) / group / st->update_every + 1) {
1178                 error("points_new %ld is more than points %ld", points_new, (before_new - after_new) / group / st->update_every + 1);
1179         }
1180 #endif
1181
1182         //info("RRD2RRDR(): %s: wanted %ld points, got %ld - group=%ld, wanted duration=%u, got %u - wanted %ld - %ld, got %ld - %ld", st->id, points, points_new, group, before - after, before_new - after_new, after, before, after_new, before_new);
1183
1184         after = after_new;
1185         before = before_new;
1186         duration = before - after;
1187         points = points_new;
1188
1189         // Now we have:
1190         // before = the end time of the calculation
1191         // after = the start time of the calculation
1192         // duration = the duration of the calculation
1193         // group = the number of source points to aggregate / group together
1194         // method = the method of grouping source points
1195         // points = the number of points to generate
1196
1197
1198         // -------------------------------------------------------------------------
1199         // initialize our result set
1200
1201         RRDR *r = rrdr_create(st, points);
1202         if(!r) {
1203 #ifdef NETDATA_INTERNAL_CHECKS
1204                 error("Cannot create RRDR for %s, after=%u, before=%u, duration=%u, points=%d", st->id, after, before, duration, points);
1205 #endif
1206                 return NULL;
1207         }
1208         if(!r->d) {
1209 #ifdef NETDATA_INTERNAL_CHECKS
1210                 error("Returning empty RRDR (no dimensions in RRDSET) for %s, after=%u, before=%u, duration=%u, points=%d", st->id, after, before, duration, points);
1211 #endif
1212                 return r;
1213         }
1214
1215         // find how many dimensions we have
1216         long dimensions = r->d;
1217
1218
1219         // -------------------------------------------------------------------------
1220         // checks for debugging
1221
1222         if(debug) debug(D_RRD_STATS, "INFO %s first_t: %lu, last_t: %lu, all_duration: %lu, after: %lu, before: %lu, duration: %lu, points: %ld, group: %ld"
1223                         , st->id
1224                         , first_entry_t
1225                         , last_entry_t
1226                         , last_entry_t - first_entry_t
1227                         , after
1228                         , before
1229                         , duration
1230                         , points
1231                         , group
1232                         );
1233
1234
1235         // -------------------------------------------------------------------------
1236         // temp arrays for keeping values per dimension
1237
1238         calculated_number       group_values[dimensions]; // keep sums when grouping
1239         long                            group_counts[dimensions]; // keep the number of values added to group_values
1240         uint8_t                         group_options[dimensions];
1241         uint8_t                         found_non_zero[dimensions];
1242
1243
1244         // initialize them
1245         RRDDIM *rd;
1246         long c;
1247         for( rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1248                 group_values[c] = 0;
1249                 group_counts[c] = 0;
1250                 group_options[c] = 0;
1251                 found_non_zero[c] = 0;
1252         }
1253
1254
1255         // -------------------------------------------------------------------------
1256         // the main loop
1257
1258         time_t  now = rrdset_slot2time(st, start_at_slot),
1259                         dt = st->update_every,
1260                         group_start_t = 0;
1261
1262         if(unlikely(debug)) debug(D_RRD_STATS, "BEGIN %s after_t: %lu (stop_at_t: %ld), before_t: %lu (start_at_t: %ld), start_t(now): %lu, current_entry: %ld, entries: %ld"
1263                         , st->id
1264                         , after
1265                         , stop_at_slot
1266                         , before
1267                         , start_at_slot
1268                         , now
1269                         , st->current_entry
1270                         , st->entries
1271                         );
1272
1273         r->group = group;
1274         r->update_every = group * st->update_every;
1275         r->before = now;
1276         r->after = now;
1277
1278         //info("RRD2RRDR(): %s: STARTING", st->id);
1279
1280         long slot = start_at_slot, counter = 0, stop_now = 0, added = 0, group_count = 0, add_this = 0;
1281         for(; !stop_now ; now -= dt, slot--, counter++) {
1282                 if(unlikely(slot < 0)) slot = st->entries - 1;
1283                 if(unlikely(slot == stop_at_slot)) stop_now = counter;
1284
1285                 if(unlikely(debug)) debug(D_RRD_STATS, "ROW %s slot: %ld, entries_counter: %ld, group_count: %ld, added: %ld, now: %lu, %s %s"
1286                                 , st->id
1287                                 , slot
1288                                 , counter
1289                                 , group_count + 1
1290                                 , added
1291                                 , now
1292                                 , (group_count + 1 == group)?"PRINT":"  -  "
1293                                 , (now >= after && now <= before)?"RANGE":"  -  "
1294                                 );
1295
1296                 // make sure we return data in the proper time range
1297                 if(unlikely(now > before)) continue;
1298                 if(unlikely(now < after)) break;
1299
1300                 if(unlikely(group_count == 0)) {
1301                         group_start_t = now;
1302                 }
1303                 group_count++;
1304
1305                 if(unlikely(group_count == group)) {
1306                         if(unlikely(added >= points)) break;
1307                         add_this = 1;
1308                 }
1309
1310                 // do the calculations
1311                 for(rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1312                         storage_number n = rd->values[slot];
1313                         if(unlikely(!does_storage_number_exist(n))) continue;
1314
1315                         group_counts[c]++;
1316
1317                         calculated_number value = unpack_storage_number(n);
1318                         if(likely(value != 0.0)) {
1319                                 group_options[c] |= RRDR_NONZERO;
1320                                 found_non_zero[c] = 1;
1321                         }
1322
1323                         if(unlikely(did_storage_number_reset(n)))
1324                                 group_options[c] |= RRDR_RESET;
1325
1326                         switch(group_method) {
1327                                 case GROUP_MAX:
1328                                         if(unlikely(abs(value) > abs(group_values[c])))
1329                                                 group_values[c] = value;
1330                                         break;
1331
1332                                 default:
1333                                 case GROUP_SUM:
1334                                 case GROUP_AVERAGE:
1335                                         group_values[c] += value;
1336                                         break;
1337                         }
1338                 }
1339
1340                 // added it
1341                 if(unlikely(add_this)) {
1342                         if(unlikely(!rrdr_line_init(r, group_start_t))) break;
1343
1344                         r->after = now;
1345
1346                         calculated_number *cn = rrdr_line_values(r);
1347                         uint8_t *co = rrdr_line_options(r);
1348
1349                         for(rd = st->dimensions, c = 0 ; likely(rd && c < dimensions) ; rd = rd->next, c++) {
1350
1351                                 // update the dimension options
1352                                 if(likely(found_non_zero[c])) r->od[c] |= RRDR_NONZERO;
1353                                 if(unlikely(rd->flags & RRDDIM_FLAG_HIDDEN)) r->od[c] |= RRDR_HIDDEN;
1354
1355                                 // store the specific point options
1356                                 co[c] = group_options[c];
1357
1358                                 // store the value
1359                                 if(unlikely(group_counts[c] == 0)) {
1360                                         cn[c] = 0.0;
1361                                         co[c] |= RRDR_EMPTY;
1362                                 }
1363                                 else if(unlikely(group_method == GROUP_AVERAGE)) {
1364                                         cn[c] = group_values[c] / group_counts[c];
1365                                 }
1366                                 else {
1367                                         cn[c] = group_values[c];
1368                                 }
1369
1370                                 if(cn[c] < r->min) r->min = cn[c];
1371                                 if(cn[c] > r->max) r->max = cn[c];
1372
1373                                 // reset them for the next loop
1374                                 group_values[c] = 0;
1375                                 group_counts[c] = 0;
1376                                 group_options[c] = 0;
1377                         }
1378
1379                         added++;
1380                         group_count = 0;
1381                         add_this = 0;
1382                 }
1383         }
1384
1385         rrdr_done(r);
1386         //info("RRD2RRDR(): %s: END %ld loops made, %ld points generated", st->id, counter, rrdr_rows(r));
1387         //error("SHIFT: %s: wanted %ld points, got %ld", st->id, points, rrdr_rows(r));
1388         return r;
1389 }
1390
1391 int rrd2format(RRDSET *st, BUFFER *wb, BUFFER *dimensions, uint32_t format, long points, long long after, long long before, int group_method, uint32_t options, time_t *latest_timestamp)
1392 {
1393         RRDR *r = rrd2rrdr(st, points, after, before, group_method);
1394         if(!r) {
1395                 buffer_strcat(wb, "Cannot generate output with these parameters on this chart.");
1396                 return 500;
1397         }
1398
1399         options = rrdr_check_options(r, options);
1400
1401         if(dimensions)
1402                 rrdr_disable_not_selected_dimensions(r, buffer_tostring(dimensions));
1403
1404         if(latest_timestamp && rrdr_rows(r) > 0)
1405                 *latest_timestamp = r->before;
1406
1407         switch(format) {
1408         case DATASOURCE_SSV:
1409                 if(options & RRDR_OPTION_JSON_WRAP) {
1410                         wb->contenttype = CT_APPLICATION_JSON;
1411                         rrdr_json_wrapper_begin(r, wb, format, options, 1);
1412                         rrdr2ssv(r, wb, options, "", " ", "");
1413                         rrdr_json_wrapper_end(r, wb, format, options, 1);
1414                 }
1415                 else {
1416                         wb->contenttype = CT_TEXT_PLAIN;
1417                         rrdr2ssv(r, wb, options, "", " ", "");
1418                 }
1419                 break;
1420
1421         case DATASOURCE_SSV_COMMA:
1422                 if(options & RRDR_OPTION_JSON_WRAP) {
1423                         wb->contenttype = CT_APPLICATION_JSON;
1424                         rrdr_json_wrapper_begin(r, wb, format, options, 1);
1425                         rrdr2ssv(r, wb, options, "", ",", "");
1426                         rrdr_json_wrapper_end(r, wb, format, options, 1);
1427                 }
1428                 else {
1429                         wb->contenttype = CT_TEXT_PLAIN;
1430                         rrdr2ssv(r, wb, options, "", ",", "");
1431                 }
1432                 break;
1433
1434         case DATASOURCE_JS_ARRAY:
1435                 if(options & RRDR_OPTION_JSON_WRAP) {
1436                         wb->contenttype = CT_APPLICATION_JSON;
1437                         rrdr_json_wrapper_begin(r, wb, format, options, 0);
1438                         rrdr2ssv(r, wb, options, "[", ",", "]");
1439                         rrdr_json_wrapper_end(r, wb, format, options, 0);
1440                 }
1441                 else {
1442                         wb->contenttype = CT_APPLICATION_JSON;
1443                         rrdr2ssv(r, wb, options, "[", ",", "]");
1444                 }
1445                 break;
1446
1447         case DATASOURCE_CSV:
1448                 if(options & RRDR_OPTION_JSON_WRAP) {
1449                         wb->contenttype = CT_APPLICATION_JSON;
1450                         rrdr_json_wrapper_begin(r, wb, format, options, 1);
1451                         rrdr2csv(r, wb, options, "", ",", "\\n");
1452                         rrdr_json_wrapper_end(r, wb, format, options, 1);
1453                 }
1454                 else {
1455                         wb->contenttype = CT_TEXT_PLAIN;
1456                         rrdr2csv(r, wb, options, "", ",", "\r\n");
1457                 }
1458                 break;
1459
1460         case DATASOURCE_TSV:
1461                 if(options & RRDR_OPTION_JSON_WRAP) {
1462                         wb->contenttype = CT_APPLICATION_JSON;
1463                         rrdr_json_wrapper_begin(r, wb, format, options, 1);
1464                         rrdr2csv(r, wb, options, "", "\t", "\\n");
1465                         rrdr_json_wrapper_end(r, wb, format, options, 1);
1466                 }
1467                 else {
1468                         wb->contenttype = CT_TEXT_PLAIN;
1469                         rrdr2csv(r, wb, options, "", "\t", "\r\n");
1470                 }
1471                 break;
1472
1473         case DATASOURCE_HTML:
1474                 if(options & RRDR_OPTION_JSON_WRAP) {
1475                         wb->contenttype = CT_APPLICATION_JSON;
1476                         rrdr_json_wrapper_begin(r, wb, format, options, 1);
1477                         buffer_strcat(wb, "<html>\\n<center>\\n<table border=\\\"0\\\" cellpadding=\\\"5\\\" cellspacing=\\\"5\\\">\\n");
1478                         rrdr2csv(r, wb, options, "<tr><td>", "</td><td>", "</td></tr>\\n");
1479                         buffer_strcat(wb, "</table>\\n</center>\\n</html>\\n");
1480                         rrdr_json_wrapper_end(r, wb, format, options, 1);
1481                 }
1482                 else {
1483                         wb->contenttype = CT_TEXT_HTML;
1484                         buffer_strcat(wb, "<html>\n<center>\n<table border=\"0\" cellpadding=\"5\" cellspacing=\"5\">\n");
1485                         rrdr2csv(r, wb, options, "<tr><td>", "</td><td>", "</td></tr>\n");
1486                         buffer_strcat(wb, "</table>\n</center>\n</html>\n");
1487                 }
1488                 break;
1489
1490         case DATASOURCE_DATATABLE_JSONP:
1491                 wb->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1492
1493                 if(options & RRDR_OPTION_JSON_WRAP)
1494                         rrdr_json_wrapper_begin(r, wb, format, options, 0);
1495
1496                 rrdr2json(r, wb, options, 1);
1497
1498                 if(options & RRDR_OPTION_JSON_WRAP)
1499                         rrdr_json_wrapper_end(r, wb, format, options, 0);
1500                 break;
1501
1502         case DATASOURCE_DATATABLE_JSON:
1503                 wb->contenttype = CT_APPLICATION_JSON;
1504
1505                 if(options & RRDR_OPTION_JSON_WRAP)
1506                         rrdr_json_wrapper_begin(r, wb, format, options, 0);
1507
1508                 rrdr2json(r, wb, options, 1);
1509
1510                 if(options & RRDR_OPTION_JSON_WRAP)
1511                         rrdr_json_wrapper_end(r, wb, format, options, 0);
1512                 break;
1513
1514         case DATASOURCE_JSONP:
1515                 wb->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1516                 if(options & RRDR_OPTION_JSON_WRAP)
1517                         rrdr_json_wrapper_begin(r, wb, format, options, 0);
1518
1519                 rrdr2json(r, wb, options, 0);
1520
1521                 if(options & RRDR_OPTION_JSON_WRAP)
1522                         rrdr_json_wrapper_end(r, wb, format, options, 0);
1523                 break;
1524
1525         case DATASOURCE_JSON:
1526         default:
1527                 wb->contenttype = CT_APPLICATION_JSON;
1528
1529                 if(options & RRDR_OPTION_JSON_WRAP)
1530                         rrdr_json_wrapper_begin(r, wb, format, options, 0);
1531
1532                 rrdr2json(r, wb, options, 0);
1533
1534                 if(options & RRDR_OPTION_JSON_WRAP)
1535                         rrdr_json_wrapper_end(r, wb, format, options, 0);
1536                 break;
1537         }
1538
1539         rrdr_free(r);
1540         return 200;
1541 }
1542
1543 unsigned long rrd_stats_json(int type, RRDSET *st, BUFFER *wb, int points, int group, int group_method, time_t after, time_t before, int only_non_zero)
1544 {
1545         int c;
1546         pthread_rwlock_rdlock(&st->rwlock);
1547
1548
1549         // -------------------------------------------------------------------------
1550         // switch from JSON to google JSON
1551
1552         char kq[2] = "\"";
1553         char sq[2] = "\"";
1554         switch(type) {
1555                 case DATASOURCE_DATATABLE_JSON:
1556                 case DATASOURCE_DATATABLE_JSONP:
1557                         kq[0] = '\0';
1558                         sq[0] = '\'';
1559                         break;
1560
1561                 case DATASOURCE_JSON:
1562                 default:
1563                         break;
1564         }
1565
1566
1567         // -------------------------------------------------------------------------
1568         // validate the parameters
1569
1570         if(points < 1) points = 1;
1571         if(group < 1) group = 1;
1572
1573         if(before == 0 || before > rrdset_last_entry_t(st)) before = rrdset_last_entry_t(st);
1574         if(after  == 0 || after < rrdset_first_entry_t(st)) after = rrdset_first_entry_t(st);
1575
1576         // ---
1577
1578         // our return value (the last timestamp printed)
1579         // this is required to detect re-transmit in google JSONP
1580         time_t last_timestamp = 0;
1581
1582
1583         // -------------------------------------------------------------------------
1584         // find how many dimensions we have
1585
1586         int dimensions = 0;
1587         RRDDIM *rd;
1588         for( rd = st->dimensions ; rd ; rd = rd->next) dimensions++;
1589         if(!dimensions) {
1590                 pthread_rwlock_unlock(&st->rwlock);
1591                 buffer_strcat(wb, "No dimensions yet.");
1592                 return 0;
1593         }
1594
1595
1596         // -------------------------------------------------------------------------
1597         // prepare various strings, to speed up the loop
1598
1599         char overflow_annotation[201]; snprintf(overflow_annotation, 200, ",{%sv%s:%sRESET OR OVERFLOW%s},{%sv%s:%sThe counters have been wrapped.%s}", kq, kq, sq, sq, kq, kq, sq, sq);
1600         char normal_annotation[201];   snprintf(normal_annotation,   200, ",{%sv%s:null},{%sv%s:null}", kq, kq, kq, kq);
1601         char pre_date[51];             snprintf(pre_date,             50, "             {%sc%s:[{%sv%s:%s", kq, kq, kq, kq, sq);
1602         char post_date[21];            snprintf(post_date,            20, "%s}", sq);
1603         char pre_value[21];            snprintf(pre_value,            20, ",{%sv%s:", kq, kq);
1604         char post_value[21];           snprintf(post_value,           20, "}");
1605
1606
1607         // -------------------------------------------------------------------------
1608         // checks for debugging
1609
1610         if(st->debug) {
1611                 debug(D_RRD_STATS, "%s first_entry_t = %lu, last_entry_t = %lu, duration = %lu, after = %lu, before = %lu, duration = %lu, entries_to_show = %lu, group = %lu"
1612                         , st->id
1613                         , rrdset_first_entry_t(st)
1614                         , rrdset_last_entry_t(st)
1615                         , rrdset_last_entry_t(st) - rrdset_first_entry_t(st)
1616                         , after
1617                         , before
1618                         , before - after
1619                         , points
1620                         , group
1621                         );
1622
1623                 if(before < after)
1624                         debug(D_RRD_STATS, "WARNING: %s The newest value in the database (%lu) is earlier than the oldest (%lu)", st->name, before, after);
1625
1626                 if((before - after) > st->entries * st->update_every)
1627                         debug(D_RRD_STATS, "WARNING: %s The time difference between the oldest and the newest entries (%lu) is higher than the capacity of the database (%lu)", st->name, before - after, st->entries * st->update_every);
1628         }
1629
1630
1631         // -------------------------------------------------------------------------
1632         // temp arrays for keeping values per dimension
1633
1634         calculated_number group_values[dimensions]; // keep sums when grouping
1635         int               print_hidden[dimensions]; // keep hidden flags
1636         int               found_non_zero[dimensions];
1637         int               found_non_existing[dimensions];
1638
1639         // initialize them
1640         for( rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1641                 group_values[c] = 0;
1642                 print_hidden[c] = (rd->flags & RRDDIM_FLAG_HIDDEN)?1:0;
1643                 found_non_zero[c] = 0;
1644                 found_non_existing[c] = 0;
1645         }
1646
1647
1648         // error("OLD: points=%d after=%d before=%d group=%d, duration=%d", entries_to_show, before - (st->update_every * group * entries_to_show), before, group, before - after + 1);
1649         // rrd2array(st, entries_to_show, before - (st->update_every * group * entries_to_show), before, group_method, only_non_zero);
1650         // rrd2rrdr(st, entries_to_show, before - (st->update_every * group * entries_to_show), before, group_method);
1651
1652         // -------------------------------------------------------------------------
1653         // remove dimensions that contain only zeros
1654
1655         int max_loop = 1;
1656         if(only_non_zero) max_loop = 2;
1657
1658         for(; max_loop ; max_loop--) {
1659
1660                 // -------------------------------------------------------------------------
1661                 // print the JSON header
1662
1663                 buffer_sprintf(wb, "{\n %scols%s:\n     [\n", kq, kq);
1664                 buffer_sprintf(wb, "            {%sid%s:%s%s,%slabel%s:%stime%s,%spattern%s:%s%s,%stype%s:%sdatetime%s},\n", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq);
1665                 buffer_sprintf(wb, "            {%sid%s:%s%s,%slabel%s:%s%s,%spattern%s:%s%s,%stype%s:%sstring%s,%sp%s:{%srole%s:%sannotation%s}},\n", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, kq, kq, sq, sq);
1666                 buffer_sprintf(wb, "            {%sid%s:%s%s,%slabel%s:%s%s,%spattern%s:%s%s,%stype%s:%sstring%s,%sp%s:{%srole%s:%sannotationText%s}}", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, kq, kq, sq, sq);
1667
1668                 // print the header for each dimension
1669                 // and update the print_hidden array for the dimensions that should be hidden
1670                 int pc = 0;
1671                 for( rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1672                         if(!print_hidden[c]) {
1673                                 pc++;
1674                                 buffer_sprintf(wb, ",\n         {%sid%s:%s%s,%slabel%s:%s%s%s,%spattern%s:%s%s,%stype%s:%snumber%s}", kq, kq, sq, sq, kq, kq, sq, rd->name, sq, kq, kq, sq, sq, kq, kq, sq, sq);
1675                         }
1676                 }
1677                 if(!pc) {
1678                         buffer_sprintf(wb, ",\n         {%sid%s:%s%s,%slabel%s:%s%s%s,%spattern%s:%s%s,%stype%s:%snumber%s}", kq, kq, sq, sq, kq, kq, sq, "no data", sq, kq, kq, sq, sq, kq, kq, sq, sq);
1679                 }
1680
1681                 // print the begin of row data
1682                 buffer_sprintf(wb, "\n  ],\n    %srows%s:\n     [\n", kq, kq);
1683
1684
1685                 // -------------------------------------------------------------------------
1686                 // the main loop
1687
1688                 int annotate_reset = 0;
1689                 int annotation_count = 0;
1690
1691                 long    t = rrdset_time2slot(st, before),
1692                                 stop_at_t = rrdset_time2slot(st, after),
1693                                 stop_now = 0;
1694
1695                 t -= t % group;
1696
1697                 time_t  now = rrdset_slot2time(st, t),
1698                                 dt = st->update_every;
1699
1700                 long count = 0, printed = 0, group_count = 0;
1701                 last_timestamp = 0;
1702
1703                 if(st->debug) debug(D_RRD_STATS, "%s: REQUEST after:%lu before:%lu, points:%d, group:%d, CHART cur:%ld first: %lu last:%lu, CALC start_t:%ld, stop_t:%ld"
1704                                         , st->id
1705                                         , after
1706                                         , before
1707                                         , points
1708                                         , group
1709                                         , st->current_entry
1710                                         , rrdset_first_entry_t(st)
1711                                         , rrdset_last_entry_t(st)
1712                                         , t
1713                                         , stop_at_t
1714                                         );
1715
1716                 long counter = 0;
1717                 for(; !stop_now ; now -= dt, t--, counter++) {
1718                         if(t < 0) t = st->entries - 1;
1719                         if(t == stop_at_t) stop_now = counter;
1720
1721                         int print_this = 0;
1722
1723                         if(st->debug) debug(D_RRD_STATS, "%s t = %ld, count = %ld, group_count = %ld, printed = %ld, now = %lu, %s %s"
1724                                         , st->id
1725                                         , t
1726                                         , count + 1
1727                                         , group_count + 1
1728                                         , printed
1729                                         , now
1730                                         , (group_count + 1 == group)?"PRINT":"  -  "
1731                                         , (now >= after && now <= before)?"RANGE":"  -  "
1732                                         );
1733
1734
1735                         // make sure we return data in the proper time range
1736                         if(now > before) continue;
1737                         if(now < after) break;
1738
1739                         //if(rrdset_slot2time(st, t) != now)
1740                         //      error("%s: slot=%ld, now=%ld, slot2time=%ld, diff=%ld, last_entry_t=%ld, rrdset_last_slot=%ld", st->id, t, now, rrdset_slot2time(st,t), now - rrdset_slot2time(st,t), rrdset_last_entry_t(st), rrdset_last_slot(st));
1741
1742                         count++;
1743                         group_count++;
1744
1745                         // check if we have to print this now
1746                         if(group_count == group) {
1747                                 if(printed >= points) {
1748                                         // debug(D_RRD_STATS, "Already printed all rows. Stopping.");
1749                                         break;
1750                                 }
1751
1752                                 // generate the local date time
1753                                 struct tm tmbuf, *tm = localtime_r(&now, &tmbuf);
1754                                 if(!tm) { error("localtime() failed."); continue; }
1755                                 if(now > last_timestamp) last_timestamp = now;
1756
1757                                 if(printed) buffer_strcat(wb, "]},\n");
1758                                 buffer_strcat(wb, pre_date);
1759                                 buffer_jsdate(wb, tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
1760                                 buffer_strcat(wb, post_date);
1761
1762                                 print_this = 1;
1763                         }
1764
1765                         // do the calculations
1766                         for(rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1767                                 storage_number n = rd->values[t];
1768                                 calculated_number value = unpack_storage_number(n);
1769
1770                                 if(!does_storage_number_exist(n)) {
1771                                         value = 0.0;
1772                                         found_non_existing[c]++;
1773                                 }
1774                                 if(did_storage_number_reset(n)) annotate_reset = 1;
1775
1776                                 switch(group_method) {
1777                                         case GROUP_MAX:
1778                                                 if(abs(value) > abs(group_values[c])) group_values[c] = value;
1779                                                 break;
1780
1781                                         case GROUP_SUM:
1782                                                 group_values[c] += value;
1783                                                 break;
1784
1785                                         default:
1786                                         case GROUP_AVERAGE:
1787                                                 group_values[c] += value;
1788                                                 if(print_this) group_values[c] /= ( group_count - found_non_existing[c] );
1789                                                 break;
1790                                 }
1791                         }
1792
1793                         if(print_this) {
1794                                 if(annotate_reset) {
1795                                         annotation_count++;
1796                                         buffer_strcat(wb, overflow_annotation);
1797                                         annotate_reset = 0;
1798                                 }
1799                                 else
1800                                         buffer_strcat(wb, normal_annotation);
1801
1802                                 pc = 0;
1803                                 for(c = 0 ; c < dimensions ; c++) {
1804                                         if(found_non_existing[c] == group_count) {
1805                                                 // all entries are non-existing
1806                                                 pc++;
1807                                                 buffer_strcat(wb, pre_value);
1808                                                 buffer_strcat(wb, "null");
1809                                                 buffer_strcat(wb, post_value);
1810                                         }
1811                                         else if(!print_hidden[c]) {
1812                                                 pc++;
1813                                                 buffer_strcat(wb, pre_value);
1814                                                 buffer_rrd_value(wb, group_values[c]);
1815                                                 buffer_strcat(wb, post_value);
1816
1817                                                 if(group_values[c]) found_non_zero[c]++;
1818                                         }
1819
1820                                         // reset them for the next loop
1821                                         group_values[c] = 0;
1822                                         found_non_existing[c] = 0;
1823                                 }
1824
1825                                 // if all dimensions are hidden, print a null
1826                                 if(!pc) {
1827                                         buffer_strcat(wb, pre_value);
1828                                         buffer_strcat(wb, "null");
1829                                         buffer_strcat(wb, post_value);
1830                                 }
1831
1832                                 printed++;
1833                                 group_count = 0;
1834                         }
1835                 }
1836
1837                 if(printed) buffer_strcat(wb, "]}");
1838                 buffer_strcat(wb, "\n   ]\n}\n");
1839
1840                 if(only_non_zero && max_loop > 1) {
1841                         int changed = 0;
1842                         for(rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1843                                 group_values[c] = 0;
1844                                 found_non_existing[c] = 0;
1845
1846                                 if(!print_hidden[c] && !found_non_zero[c]) {
1847                                         changed = 1;
1848                                         print_hidden[c] = 1;
1849                                 }
1850                         }
1851
1852                         if(changed) buffer_flush(wb);
1853                         else break;
1854                 }
1855                 else break;
1856
1857         } // max_loop
1858
1859         debug(D_RRD_STATS, "RRD_STATS_JSON: %s total %ld bytes", st->name, wb->len);
1860
1861         pthread_rwlock_unlock(&st->rwlock);
1862         return last_timestamp;
1863 }