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 group;                              // how many collected values were grouped for each row
 273         int update_every;               // what is the suggested update frequency in seconds
 274
 275         int d;                                  // the number of dimensions
 276         int n;                                  // the number of values in the arrays
 277
 278         uint8_t *od;                    // the options for the dimensions
 279
 280         time_t *t;                              // array of n timestamps
 281         calculated_number *v;   // array n x d values
 282         uint8_t *o;                             // array n x d options
 283
 284         int c;                                  // current line ( -1 ~ n ), ( -1 = none, use rrdr_rows() to get number of rows )
 285
 286         int has_st_lock;                // if st is read locked by us
 287 } RRDR;
 288
 289 #define rrdr_rows(r) ((r)->c + 1)
 290
 291 /*
 292 static void rrdr_dump(RRDR *r)
 293 {
 294         long c, i;
 295         RRDDIM *d;
 296
 297         fprintf(stderr, "\nCHART %s (%s)\n", r->st->id, r->st->name);
 298
 299         for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 300                 fprintf(stderr, "DIMENSION %s (%s), %s%s%s%s\n"
 301                                 , d->id
 302                                 , d->name
 303                                 , (r->od[c] & RRDR_EMPTY)?"EMPTY ":""
 304                                 , (r->od[c] & RRDR_RESET)?"RESET ":""
 305                                 , (r->od[c] & RRDR_HIDDEN)?"HIDDEN ":""
 306                                 , (r->od[c] & RRDR_NONZERO)?"NONZERO ":""
 307                                 );
 308         }
 309
 310         if(r->c < 0) {
 311                 fprintf(stderr, "RRDR does not have any values in it.\n");
 312                 return;
 313         }
 314
 315         fprintf(stderr, "RRDR includes %d values in it:\n", r->c + 1);
 316
 317         // for each line in the array
 318         for(i = 0; i <= r->c ;i++) {
 319                 calculated_number *cn = &r->v[ i * r->d ];
 320                 uint8_t *co = &r->o[ i * r->d ];
 321
 322                 // print the id and the timestamp of the line
 323                 fprintf(stderr, "%ld %ld ", i + 1, r->t[i]);
 324
 325                 // for each dimension
 326                 for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 327                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 328                         if(unlikely(!(r->od[c] & RRDR_NONZERO))) continue;
 329
 330                         if(co[c] & RRDR_EMPTY)
 331                                 fprintf(stderr, "null ");
 332                         else
 333                                 fprintf(stderr, CALCULATED_NUMBER_FORMAT " %s%s%s%s "
 334                                         , cn[c]
 335                                         , (co[c] & RRDR_EMPTY)?"E":" "
 336                                         , (co[c] & RRDR_RESET)?"R":" "
 337                                         , (co[c] & RRDR_HIDDEN)?"H":" "
 338                                         , (co[c] & RRDR_NONZERO)?"N":" "
 339                                         );
 340                 }
 341
 342                 fprintf(stderr, "\n");
 343         }
 344 }
 345 */
 346
 347 void rrdr_disable_not_selected_dimensions(RRDR *r, const char *dims)
 348 {
 349         char b[strlen(dims) + 1];
 350         char *o = b, *tok;
 351         strcpy(o, dims);
 352
 353         long c;
 354         RRDDIM *d;
 355
 356         // disable all of them
 357         for(c = 0, d = r->st->dimensions; d ;c++, d = d->next)
 358                 r->od[c] |= RRDR_HIDDEN;
 359
 360         while(o && *o && (tok = mystrsep(&o, ", |"))) {
 361                 if(!*tok) continue;
 362
 363                 // find it and enable it
 364                 for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 365                         if(!strcmp(d->name, tok)) {
 366                                 r->od[c] &= ~RRDR_HIDDEN;
 367                         }
 368                 }
 369         }
 370 }
 371
 372 #define JSON_DATES_JS 1
 373 #define JSON_DATES_TIMESTAMP 2
 374
 375 static void rrdr2json(RRDR *r, BUFFER *wb, uint32_t options, int datatable)
 376 {
 377         int annotations = 0, dates = JSON_DATES_JS, dates_with_new = 0;
 378         char kq[2] = "",                                        // key quote
 379                 sq[2] = "",                                             // string quote
 380                 pre_label[101] = "",                    // before each label
 381                 post_label[101] = "",                   // after each label
 382                 pre_date[101] = "",                             // the beginning of line, to the date
 383                 post_date[101] = "",                    // closing the date
 384                 pre_value[101] = "",                    // before each value
 385                 post_value[101] = "",                   // after each value
 386                 post_line[101] = "",                    // at the end of each row
 387                 normal_annotation[201] = "",    // default row annotation
 388                 overflow_annotation[201] = "",  // overflow row annotation
 389                 data_begin[101] = "",                   // between labels and values
 390                 finish[101] = "";                               // at the end of everything
 391
 392         if(datatable) {
 393                 dates = JSON_DATES_JS;
 394                 if( options & RRDR_OPTION_GOOGLE_JSON ) {
 395                         kq[0] = '\0';
 396                         sq[0] = '\'';
 397                 }
 398                 else {
 399                         kq[0] = '"';
 400                         sq[0] = '"';
 401                 }
 402                 annotations = 1;
 403                 snprintf(pre_date,   100, "             {%sc%s:[{%sv%s:%s", kq, kq, kq, kq, sq);
 404                 snprintf(post_date,  100, "%s}", sq);
 405                 snprintf(pre_label,  100, ",\n          {%sid%s:%s%s,%slabel%s:%s", kq, kq, sq, sq, kq, kq, sq);
 406                 snprintf(post_label, 100, "%s,%spattern%s:%s%s,%stype%s:%snumber%s}", sq, kq, kq, sq, sq, kq, kq, sq, sq);
 407                 snprintf(pre_value,  100, ",{%sv%s:", kq, kq);
 408                 snprintf(post_value, 100, "}");
 409                 snprintf(post_line,  100, "]}");
 410                 snprintf(data_begin, 100, "\n   ],\n    %srows%s:\n     [\n", kq, kq);
 411                 snprintf(finish,     100, "\n   ]\n}\n");
 412
 413                 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);
 414                 snprintf(normal_annotation,   200, ",{%sv%s:null},{%sv%s:null}", kq, kq, kq, kq);
 415
 416                 buffer_sprintf(wb, "{\n %supdate_every%s: %d,\n %scols%s:\n     [\n", kq, kq, r->update_every, kq, kq, kq, kq);
 417                 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);
 418                 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);
 419                 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);
 420
 421                 // remove the valueobjects flag
 422                 // google wants its own keys
 423                 if(options & RRDR_OPTION_OBJECTSROWS)
 424                         options &= ~RRDR_OPTION_OBJECTSROWS;
 425         }
 426         else {
 427                 kq[0] = '"';
 428                 sq[0] = '"';
 429                 if((options & RRDR_OPTION_SECONDS) || (options & RRDR_OPTION_MILLISECONDS)) {
 430                         dates = JSON_DATES_TIMESTAMP;
 431                         dates_with_new = 0;
 432                 }
 433                 else {
 434                         dates = JSON_DATES_JS;
 435                         dates_with_new = 1;
 436                 }
 437                 if( options & RRDR_OPTION_OBJECTSROWS )
 438                         snprintf(pre_date,   100, "             { ");
 439                 else
 440                         snprintf(pre_date,   100, "             [ ");
 441                 snprintf(pre_label,  100, ", \"");
 442                 snprintf(post_label, 100, "\"");
 443                 snprintf(pre_value,  100, ", ");
 444                 if( options & RRDR_OPTION_OBJECTSROWS )
 445                         snprintf(post_line,  100, "}");
 446                 else
 447                         snprintf(post_line,  100, "]");
 448                 snprintf(data_begin, 100, "],\n %sdata%s:\n     [\n", kq, kq);
 449                 snprintf(finish,     100, "\n   ]\n}\n");
 450
 451                 buffer_sprintf(wb, "{\n %supdate_every%s: %d,\n %slabels%s: [", kq, kq, r->update_every, kq, kq);
 452                 buffer_sprintf(wb, "%stime%s", sq, sq);
 453         }
 454
 455         // -------------------------------------------------------------------------
 456         // print the JSON header
 457
 458         long c, i;
 459         RRDDIM *rd;
 460
 461         // print the csv header
 462         for(c = 0, i = 0, rd = r->st->dimensions; rd ;c++, rd = rd->next) {
 463                 if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 464                 if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 465
 466                 buffer_strcat(wb, pre_label);
 467                 buffer_strcat(wb, rd->name);
 468                 buffer_strcat(wb, post_label);
 469                 i++;
 470         }
 471         if(!i) {
 472                 buffer_strcat(wb, pre_label);
 473                 buffer_strcat(wb, "no data");
 474                 buffer_strcat(wb, post_label);
 475         }
 476
 477         // print the begin of row data
 478         buffer_strcat(wb, data_begin);
 479
 480         // if all dimensions are hidden, print a null
 481         if(!i) {
 482                 buffer_strcat(wb, pre_value);
 483                 if(options & RRDR_OPTION_NULL2ZERO)
 484                         buffer_strcat(wb, "0");
 485                 else
 486                         buffer_strcat(wb, "null");
 487                 buffer_strcat(wb, post_value);
 488         }
 489
 490         long start = 0, end = rrdr_rows(r), step = 1;
 491         if((options & RRDR_OPTION_REVERSED)) {
 492                 start = rrdr_rows(r) - 1;
 493                 end = -1;
 494                 step = -1;
 495         }
 496
 497         // for each line in the array
 498         for(i = start; i != end ;i += step) {
 499                 calculated_number *cn = &r->v[ i * r->d ];
 500                 uint8_t *co = &r->o[ i * r->d ];
 501
 502                 time_t now = r->t[i];
 503
 504                 if(dates == JSON_DATES_JS) {
 505                         // generate the local date time
 506                         struct tm *tm = localtime(&now);
 507                         if(!tm) { error("localtime() failed."); continue; }
 508
 509                         if(likely(i != start)) buffer_strcat(wb, ",\n");
 510                         buffer_strcat(wb, pre_date);
 511
 512                         if( options & RRDR_OPTION_OBJECTSROWS )
 513                                 buffer_sprintf(wb, "%stime%s: ", kq, kq);
 514
 515                         if(dates_with_new)
 516                                 buffer_strcat(wb, "new ");
 517
 518                         buffer_jsdate(wb, tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
 519
 520                         buffer_strcat(wb, post_date);
 521
 522                         if(annotations) {
 523                                 if(co[c] & RRDR_RESET)
 524                                         buffer_strcat(wb, overflow_annotation);
 525                                 else
 526                                         buffer_strcat(wb, normal_annotation);
 527                         }
 528                 }
 529                 else {
 530                         // print the timestamp of the line
 531                         if(likely(i != start)) buffer_strcat(wb, ",\n");
 532                         buffer_strcat(wb, pre_date);
 533
 534                         if( options & RRDR_OPTION_OBJECTSROWS )
 535                                 buffer_sprintf(wb, "%stime%s: ", kq, kq);
 536
 537                         buffer_rrd_value(wb, (calculated_number)r->t[i]);
 538                         // in ms
 539                         if(options & RRDR_OPTION_MILLISECONDS) buffer_strcat(wb, "000");
 540
 541                         buffer_strcat(wb, post_date);
 542                 }
 543
 544                 // for each dimension
 545                 for(c = 0, rd = r->st->dimensions; rd ;c++, rd = rd->next) {
 546                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 547                         if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 548
 549                         calculated_number n = cn[c];
 550
 551                         buffer_strcat(wb, pre_value);
 552
 553                         if( options & RRDR_OPTION_OBJECTSROWS )
 554                                 buffer_sprintf(wb, "%s%s%s: ", kq, rd->name, kq);
 555
 556                         if(co[c] & RRDR_EMPTY) {
 557                                 if(options & RRDR_OPTION_NULL2ZERO)
 558                                         buffer_strcat(wb, "0");
 559                                 else
 560                                         buffer_strcat(wb, "null");
 561                         }
 562                         else if((options & RRDR_OPTION_ABSOLUTE))
 563                                 buffer_rrd_value(wb, (n<0)?-n:n);
 564                         else
 565                                 buffer_rrd_value(wb, n);
 566
 567                         buffer_strcat(wb, post_value);
 568                 }
 569
 570                 buffer_strcat(wb, post_line);
 571         }
 572
 573         buffer_strcat(wb, finish);
 574 }
 575
 576 static void rrdr2csv(RRDR *r, BUFFER *wb, uint32_t options, const char *startline, const char *separator, const char *endline)
 577 {
 578         long c, i;
 579         RRDDIM *d;
 580
 581         // print the csv header
 582         for(c = 0, i = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 583                 if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 584                 if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 585
 586                 if(!i) {
 587                         buffer_strcat(wb, startline);
 588                         buffer_strcat(wb, "time");
 589                 }
 590                 buffer_strcat(wb, separator);
 591                 buffer_strcat(wb, d->name);
 592                 i++;
 593         }
 594         buffer_strcat(wb, endline);
 595
 596         if(!i) {
 597                 // no dimensions present
 598                 return;
 599         }
 600
 601         long start = 0, end = rrdr_rows(r), step = 1;
 602         if((options & RRDR_OPTION_REVERSED)) {
 603                 start = rrdr_rows(r) - 1;
 604                 end = -1;
 605                 step = -1;
 606         }
 607
 608         // for each line in the array
 609         for(i = start; i != end ;i += step) {
 610                 calculated_number *cn = &r->v[ i * r->d ];
 611                 uint8_t *co = &r->o[ i * r->d ];
 612
 613                 buffer_strcat(wb, startline);
 614
 615                 time_t now = r->t[i];
 616
 617                 if((options & RRDR_OPTION_SECONDS) || (options & RRDR_OPTION_MILLISECONDS)) {
 618                         // print the timestamp of the line
 619                         buffer_rrd_value(wb, (calculated_number)now);
 620                         // in ms
 621                         if(options & RRDR_OPTION_MILLISECONDS) buffer_strcat(wb, "000");
 622                 }
 623                 else {
 624                         // generate the local date time
 625                         struct tm *tm = localtime(&now);
 626                         if(!tm) { error("localtime() failed."); continue; }
 627                         buffer_date(wb, tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
 628                 }
 629
 630                 // for each dimension
 631                 for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 632                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 633                         if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 634
 635                         buffer_strcat(wb, separator);
 636
 637                         calculated_number n = cn[c];
 638
 639                         if(co[c] & RRDR_EMPTY) {
 640                                 if(options & RRDR_OPTION_NULL2ZERO)
 641                                         buffer_strcat(wb, "0");
 642                                 else
 643                                         buffer_strcat(wb, "null");
 644                         }
 645                         else if((options & RRDR_OPTION_ABSOLUTE))
 646                                 buffer_rrd_value(wb, (n<0)?-n:n);
 647                         else
 648                                 buffer_rrd_value(wb, n);
 649                 }
 650
 651                 buffer_strcat(wb, endline);
 652         }
 653 }
 654
 655 static void rrdr2ssv(RRDR *r, BUFFER *out, uint32_t options, const char *prefix, const char *separator, const char *suffix)
 656 {
 657         long c, i;
 658         RRDDIM *d;
 659
 660         buffer_strcat(out, prefix);
 661         long start = 0, end = rrdr_rows(r), step = 1;
 662         if((options & RRDR_OPTION_REVERSED)) {
 663                 start = rrdr_rows(r) - 1;
 664                 end = -1;
 665                 step = -1;
 666         }
 667
 668         // for each line in the array
 669         for(i = start; i != end ;i += step) {
 670
 671                 calculated_number *cn = &r->v[ i * r->d ];
 672                 uint8_t *co = &r->o[ i * r->d ];
 673
 674                 calculated_number sum = 0, min = 0, max = 0;
 675                 int all_null = 1, init = 1;
 676
 677                 // for each dimension
 678                 for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
 679                         if(unlikely(r->od[c] & RRDR_HIDDEN)) continue;
 680                         if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_NONZERO))) continue;
 681
 682                         calculated_number n = cn[c];
 683
 684                         if(unlikely(init)) {
 685                                 if(n > 0) {
 686                                         min = 0;
 687                                         max = n;
 688                                 }
 689                                 else {
 690                                         min = n;
 691                                         max = 0;
 692                                 }
 693                                 init = 0;
 694                         }
 695
 696                         if(likely(!(co[c] & RRDR_EMPTY))) {
 697                                 all_null = 0;
 698                                 if((options & RRDR_OPTION_ABSOLUTE) && n < 0) n = -n;
 699                                 sum += n;
 700                         }
 701
 702                         if(n < min) min = n;
 703                         if(n > max) max = n;
 704                 }
 705
 706                 if(likely(i != start))
 707                         buffer_strcat(out, separator);
 708
 709                 if(all_null) {
 710                         if(options & RRDR_OPTION_NULL2ZERO)
 711                                 buffer_strcat(out, "0");
 712                         else
 713                                 buffer_strcat(out, "null");
 714                 }
 715                 else if(options & RRDR_OPTION_MIN2MAX)
 716                         buffer_rrd_value(out, max - min);
 717                 else
 718                         buffer_rrd_value(out, sum);
 719         }
 720         buffer_strcat(out, suffix);
 721 }
 722
 723 inline static calculated_number *rrdr_line_values(RRDR *r)
 724 {
 725         return &r->v[ r->c * r->d ];
 726 }
 727
 728 inline static uint8_t *rrdr_line_options(RRDR *r)
 729 {
 730         return &r->o[ r->c * r->d ];
 731 }
 732
 733 inline static int rrdr_line_init(RRDR *r, time_t t)
 734 {
 735         r->c++;
 736         if(unlikely(r->c >= r->n)) {
 737                 r->c = r->n - 1;
 738                 return 0;
 739         }
 740
 741         // save the time
 742         r->t[r->c] = t;
 743
 744         return 1;
 745 }
 746
 747 inline static void rrdr_lock_rrdset(RRDR *r) {
 748         if(unlikely(!r)) {
 749                 error("NULL value given!");
 750                 return;
 751         }
 752
 753         pthread_rwlock_rdlock(&r->st->rwlock);
 754         r->has_st_lock = 1;
 755 }
 756
 757 inline static void rrdr_unlock_rrdset(RRDR *r) {
 758         if(unlikely(!r)) {
 759                 error("NULL value given!");
 760                 return;
 761         }
 762
 763         if(likely(r->has_st_lock)) {
 764                 pthread_rwlock_unlock(&r->st->rwlock);
 765                 r->has_st_lock = 0;
 766         }
 767 }
 768
 769 inline static void rrdr_free(RRDR *r)
 770 {
 771         if(unlikely(!r)) {
 772                 error("NULL value given!");
 773                 return;
 774         }
 775
 776         rrdr_unlock_rrdset(r);
 777         if(likely(r->t)) free(r->t);
 778         if(likely(r->v)) free(r->v);
 779         if(likely(r->o)) free(r->o);
 780         if(likely(r->od)) free(r->od);
 781         free(r);
 782 }
 783
 784 static RRDR *rrdr_create(RRDSET *st, int n)
 785 {
 786         if(unlikely(!st)) {
 787                 error("NULL value given!");
 788                 return NULL;
 789         }
 790
 791         RRDR *r = calloc(1, sizeof(RRDR));
 792         if(unlikely(!r)) goto cleanup;
 793
 794         r->st = st;
 795
 796         rrdr_lock_rrdset(r);
 797
 798         RRDDIM *rd;
 799         for(rd = st->dimensions ; rd ; rd = rd->next) r->d++;
 800
 801         r->n = n;
 802         r->t = malloc(n * sizeof(time_t));
 803         if(unlikely(!r->t)) goto cleanup;
 804
 805         r->v = malloc(n * r->d * sizeof(calculated_number));
 806         if(unlikely(!r->v)) goto cleanup;
 807
 808         r->o = malloc(n * r->d * sizeof(uint8_t));
 809         if(unlikely(!r->o)) goto cleanup;
 810
 811         r->od = calloc(r->d, sizeof(uint8_t));
 812         if(unlikely(!r->od)) goto cleanup;
 813
 814         r->c = -1;
 815
 816         return r;
 817
 818 cleanup:
 819         error("Cannot allocate memory");
 820         if(likely(r)) rrdr_free(r);
 821         return NULL;
 822 }
 823
 824 RRDR *rrd2rrdr(RRDSET *st, long points, long long after, long long before, int group_method)
 825 {
 826         int debug = st->debug;
 827
 828         time_t first_entry_t = rrdset_first_entry_t(st);
 829         time_t last_entry_t = rrdset_last_entry_t(st);
 830
 831         if(before == 0 && after == 0) {
 832                 before = last_entry_t;
 833                 after = first_entry_t;
 834         }
 835
 836         // allow relative for before and after
 837         if(before <= st->update_every * st->entries) before = last_entry_t + before;
 838         if(after <= st->update_every * st->entries) after = last_entry_t + after;
 839
 840         // make sure they are within our timeframe
 841         if(before > last_entry_t) before = last_entry_t;
 842         if(before < first_entry_t) before = first_entry_t;
 843
 844         if(after > last_entry_t) after = last_entry_t;
 845         if(after < first_entry_t) after = first_entry_t;
 846
 847         // check if they are upside down
 848         if(after > before) {
 849                 time_t tmp = before;
 850                 before = after;
 851                 after = tmp;
 852         }
 853
 854         // the duration of the chart
 855         time_t duration = before - after;
 856         if(duration <= 0) return NULL;
 857
 858         // check the required points
 859         if(points > duration / st->update_every) points = 0;
 860         if(points <= 0) points = duration / st->update_every;
 861
 862         // calculate proper grouping of source data
 863         long group = duration / points;
 864         if(group <= 0) group = 1;
 865         if(duration / group > points) group++;
 866
 867         // error("NEW: points=%d after=%d before=%d group=%d, duration=%d", points, after, before, group, duration);
 868
 869         // Now we have:
 870         // before = the end time of the calculation
 871         // after = the start time of the calculation
 872         // duration = the duration of the calculation
 873         // group = the number of source points to aggregate / group together
 874         // method = the method of grouping source points
 875         // points = the number of points to generate
 876
 877
 878         // -------------------------------------------------------------------------
 879         // initialize our result set
 880
 881         RRDR *r = rrdr_create(st, points);
 882         if(!r) return NULL;
 883         if(!r->d) {
 884                 rrdr_free(r);
 885                 return NULL;
 886         }
 887
 888         // find how many dimensions we have
 889         long dimensions = r->d;
 890
 891
 892         // -------------------------------------------------------------------------
 893         // checks for debugging
 894
 895         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"
 896                         , st->id
 897                         , first_entry_t
 898                         , last_entry_t
 899                         , last_entry_t - first_entry_t
 900                         , after
 901                         , before
 902                         , duration
 903                         , points
 904                         , group
 905                         );
 906
 907
 908         // -------------------------------------------------------------------------
 909         // temp arrays for keeping values per dimension
 910
 911         calculated_number       group_values[dimensions]; // keep sums when grouping
 912         long                            group_counts[dimensions]; // keep the number of values added to group_values
 913         uint8_t                         group_options[dimensions];
 914         uint8_t                         found_non_zero[dimensions];
 915
 916
 917         // initialize them
 918         RRDDIM *rd;
 919         long c;
 920         for( rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
 921                 group_values[c] = 0;
 922                 group_counts[c] = 0;
 923                 group_options[c] = 0;
 924                 found_non_zero[c] = 0;
 925         }
 926
 927
 928         // -------------------------------------------------------------------------
 929         // the main loop
 930
 931         long    start_at_slot = rrdset_time2slot(st, before), // rrdset_last_slot(st),
 932                         stop_at_slot = rrdset_time2slot(st, after);
 933
 934         time_t  now = rrdset_slot2time(st, start_at_slot),
 935                         dt = st->update_every,
 936                         group_start_t = 0;
 937
 938         if(unlikely(debug)) debug(D_RRD_STATS, "INFO  %s after_t: %lu (stop_at_t: %ld), before_t: %lu (start_at_t: %ld), start_t(now): %lu, current_entry: %ld, entries: %ld"
 939                         , st->id
 940                         , after
 941                         , stop_at_slot
 942                         , before
 943                         , start_at_slot
 944                         , now
 945                         , st->current_entry
 946                         , st->entries
 947                         );
 948
 949         // align to group for proper panning of data
 950         start_at_slot -= start_at_slot % group;
 951         stop_at_slot -= stop_at_slot % group;
 952         now = rrdset_slot2time(st, start_at_slot);
 953
 954         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"
 955                         , st->id
 956                         , after
 957                         , stop_at_slot
 958                         , before
 959                         , start_at_slot
 960                         , now
 961                         , st->current_entry
 962                         , st->entries
 963                         );
 964
 965         r->group = group;
 966         r->update_every = group * st->update_every;
 967
 968         long slot = start_at_slot, counter = 0, stop_now = 0, added = 0, group_count = 0, add_this = 0;
 969         for(; !stop_now ; now -= dt, slot--, counter++) {
 970                 if(unlikely(slot < 0)) slot = st->entries - 1;
 971                 if(unlikely(slot == stop_at_slot)) stop_now = counter;
 972
 973                 if(unlikely(debug)) debug(D_RRD_STATS, "ROW %s slot: %ld, entries_counter: %ld, group_count: %ld, added: %ld, now: %lu, %s %s"
 974                                 , st->id
 975                                 , slot
 976                                 , counter
 977                                 , group_count + 1
 978                                 , added
 979                                 , now
 980                                 , (group_count + 1 == group)?"PRINT":"  -  "
 981                                 , (now >= after && now <= before)?"RANGE":"  -  "
 982                                 );
 983
 984                 // make sure we return data in the proper time range
 985                 if(unlikely(now > before)) continue;
 986                 if(unlikely(now < after)) break;
 987
 988                 if(unlikely(group_count == 0)) group_start_t = now;
 989                 group_count++;
 990
 991                 if(unlikely(group_count == group)) {
 992                         if(unlikely(added >= points)) break;
 993                         add_this = 1;
 994                 }
 995
 996                 // do the calculations
 997                 for(rd = st->dimensions, c = 0 ; likely(rd && c < dimensions) ; rd = rd->next, c++) {
 998                         storage_number n = rd->values[slot];
 999                         if(unlikely(!does_storage_number_exist(n))) continue;
1000
1001                         group_counts[c]++;
1002
1003                         calculated_number value = unpack_storage_number(n);
1004                         if(likely(value != 0.0)) {
1005                                 group_options[c] |= RRDR_NONZERO;
1006                                 found_non_zero[c] = 1;
1007                         }
1008
1009                         if(unlikely(did_storage_number_reset(n)))
1010                                 group_options[c] |= RRDR_RESET;
1011
1012                         switch(group_method) {
1013                                 case GROUP_MAX:
1014                                         if(unlikely(abs(value) > abs(group_values[c])))
1015                                                 group_values[c] = value;
1016                                         break;
1017
1018                                 default:
1019                                 case GROUP_SUM:
1020                                 case GROUP_AVERAGE:
1021                                         group_values[c] += value;
1022                                         break;
1023                         }
1024                 }
1025
1026                 // added it
1027                 if(unlikely(add_this)) {
1028                         if(unlikely(!rrdr_line_init(r, group_start_t))) break;
1029
1030                         calculated_number *cn = rrdr_line_values(r);
1031                         uint8_t *co = rrdr_line_options(r);
1032
1033                         for(rd = st->dimensions, c = 0 ; likely(rd && c < dimensions) ; rd = rd->next, c++) {
1034
1035                                 // update the dimension options
1036                                 if(likely(found_non_zero[c])) r->od[c] |= RRDR_NONZERO;
1037                                 if(unlikely(rd->flags & RRDDIM_FLAG_HIDDEN)) r->od[c] |= RRDR_HIDDEN;
1038
1039                                 // store the specific point options
1040                                 co[c] = group_options[c];
1041
1042                                 // store the value
1043                                 if(unlikely(group_counts[c] == 0)) {
1044                                         cn[c] = 0.0;
1045                                         co[c] |= RRDR_EMPTY;
1046                                 }
1047                                 else if(unlikely(group_method == GROUP_AVERAGE)) {
1048                                         cn[c] = group_values[c] / group_counts[c];
1049                                 }
1050                                 else {
1051                                         cn[c] = group_values[c];
1052                                 }
1053
1054                                 // reset them for the next loop
1055                                 group_values[c] = 0;
1056                                 group_counts[c] = 0;
1057                                 group_options[c] = 0;
1058                         }
1059
1060                         added++;
1061                         group_count = 0;
1062                         add_this = 0;
1063                 }
1064         }
1065
1066         return r;
1067 }
1068
1069 int rrd2format(RRDSET *st, BUFFER *out, BUFFER *dimensions, uint32_t format, long points, long long after, long long before, int group_method, uint32_t options, time_t *latest_timestamp)
1070 {
1071         RRDR *rrdr = rrd2rrdr(st, points, after, before, group_method);
1072         if(!rrdr) {
1073                 buffer_strcat(out, "Cannot generate output with these parameters on this chart.");
1074                 return 500;
1075         }
1076
1077         if(dimensions)
1078                 rrdr_disable_not_selected_dimensions(rrdr, buffer_tostring(dimensions));
1079
1080         if(latest_timestamp && rrdr_rows(rrdr) > 0)
1081                 *latest_timestamp = rrdr->t[rrdr_rows(rrdr) - 1];
1082
1083         switch(format) {
1084         case DATASOURCE_SSV:
1085                 out->contenttype = CT_TEXT_PLAIN;
1086                 rrdr2ssv(rrdr, out, options, "", " ", "");
1087                 break;
1088
1089         case DATASOURCE_SSV_COMMA:
1090                 out->contenttype = CT_TEXT_PLAIN;
1091                 rrdr2ssv(rrdr, out, options, "", ",", "");
1092                 break;
1093
1094         case DATASOURCE_JS_ARRAY:
1095                 out->contenttype = CT_APPLICATION_JSON;
1096                 rrdr2ssv(rrdr, out, options, "[", ",", "]");
1097                 break;
1098
1099         case DATASOURCE_CSV:
1100                 out->contenttype = CT_TEXT_PLAIN;
1101                 rrdr2csv(rrdr, out, options, "", ",", "\r\n");
1102                 break;
1103
1104         case DATASOURCE_TSV:
1105                 out->contenttype = CT_TEXT_PLAIN;
1106                 rrdr2csv(rrdr, out, options, "", "\t", "\r\n");
1107                 break;
1108
1109         case DATASOURCE_HTML:
1110                 out->contenttype = CT_TEXT_HTML;
1111                 buffer_strcat(out, "<html>\n<center><table border=\"0\" cellpadding=\"5\" cellspacing=\"5\">");
1112                 rrdr2csv(rrdr, out, options, "<tr><td>", "</td><td>", "</td></tr>\n");
1113                 buffer_strcat(out, "</table>\n</center>\n</html>\n");
1114                 break;
1115
1116         case DATASOURCE_DATATABLE_JSONP:
1117                 out->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1118                 rrdr2json(rrdr, out, options, 1);
1119                 break;
1120
1121         case DATASOURCE_DATATABLE_JSON:
1122                 out->contenttype = CT_APPLICATION_JSON;
1123                 rrdr2json(rrdr, out, options, 1);
1124                 break;
1125
1126         case DATASOURCE_JSONP:
1127                 out->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1128                 rrdr2json(rrdr, out, options, 0);
1129                 break;
1130
1131         case DATASOURCE_JSON:
1132         default:
1133                 out->contenttype = CT_APPLICATION_JSON;
1134                 rrdr2json(rrdr, out, options, 0);
1135                 break;
1136         }
1137
1138         rrdr_free(rrdr);
1139         return 200;
1140 }
1141
1142 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)
1143 {
1144         int c;
1145         pthread_rwlock_rdlock(&st->rwlock);
1146
1147
1148         // -------------------------------------------------------------------------
1149         // switch from JSON to google JSON
1150
1151         char kq[2] = "\"";
1152         char sq[2] = "\"";
1153         switch(type) {
1154                 case DATASOURCE_DATATABLE_JSON:
1155                 case DATASOURCE_DATATABLE_JSONP:
1156                         kq[0] = '\0';
1157                         sq[0] = '\'';
1158                         break;
1159
1160                 case DATASOURCE_JSON:
1161                 default:
1162                         break;
1163         }
1164
1165
1166         // -------------------------------------------------------------------------
1167         // validate the parameters
1168
1169         if(points < 1) points = 1;
1170         if(group < 1) group = 1;
1171
1172         if(before == 0 || before > rrdset_last_entry_t(st)) before = rrdset_last_entry_t(st);
1173         if(after  == 0 || after < rrdset_first_entry_t(st)) after = rrdset_first_entry_t(st);
1174
1175         // ---
1176
1177         // our return value (the last timestamp printed)
1178         // this is required to detect re-transmit in google JSONP
1179         time_t last_timestamp = 0;
1180
1181
1182         // -------------------------------------------------------------------------
1183         // find how many dimensions we have
1184
1185         int dimensions = 0;
1186         RRDDIM *rd;
1187         for( rd = st->dimensions ; rd ; rd = rd->next) dimensions++;
1188         if(!dimensions) {
1189                 pthread_rwlock_unlock(&st->rwlock);
1190                 buffer_strcat(wb, "No dimensions yet.");
1191                 return 0;
1192         }
1193
1194
1195         // -------------------------------------------------------------------------
1196         // prepare various strings, to speed up the loop
1197
1198         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);
1199         char normal_annotation[201];   snprintf(normal_annotation,   200, ",{%sv%s:null},{%sv%s:null}", kq, kq, kq, kq);
1200         char pre_date[51];             snprintf(pre_date,             50, "             {%sc%s:[{%sv%s:%s", kq, kq, kq, kq, sq);
1201         char post_date[21];            snprintf(post_date,            20, "%s}", sq);
1202         char pre_value[21];            snprintf(pre_value,            20, ",{%sv%s:", kq, kq);
1203         char post_value[21];           snprintf(post_value,           20, "}");
1204
1205
1206         // -------------------------------------------------------------------------
1207         // checks for debugging
1208
1209         if(st->debug) {
1210                 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"
1211                         , st->id
1212                         , rrdset_first_entry_t(st)
1213                         , rrdset_last_entry_t(st)
1214                         , rrdset_last_entry_t(st) - rrdset_first_entry_t(st)
1215                         , after
1216                         , before
1217                         , before - after
1218                         , points
1219                         , group
1220                         );
1221
1222                 if(before < after)
1223                         debug(D_RRD_STATS, "WARNING: %s The newest value in the database (%lu) is earlier than the oldest (%lu)", st->name, before, after);
1224
1225                 if((before - after) > st->entries * st->update_every)
1226                         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);
1227         }
1228
1229
1230         // -------------------------------------------------------------------------
1231         // temp arrays for keeping values per dimension
1232
1233         calculated_number group_values[dimensions]; // keep sums when grouping
1234         int               print_hidden[dimensions]; // keep hidden flags
1235         int               found_non_zero[dimensions];
1236         int               found_non_existing[dimensions];
1237
1238         // initialize them
1239         for( rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1240                 group_values[c] = 0;
1241                 print_hidden[c] = (rd->flags & RRDDIM_FLAG_HIDDEN)?1:0;
1242                 found_non_zero[c] = 0;
1243                 found_non_existing[c] = 0;
1244         }
1245
1246
1247         // 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);
1248         // rrd2array(st, entries_to_show, before - (st->update_every * group * entries_to_show), before, group_method, only_non_zero);
1249         // rrd2rrdr(st, entries_to_show, before - (st->update_every * group * entries_to_show), before, group_method);
1250
1251         // -------------------------------------------------------------------------
1252         // remove dimensions that contain only zeros
1253
1254         int max_loop = 1;
1255         if(only_non_zero) max_loop = 2;
1256
1257         for(; max_loop ; max_loop--) {
1258
1259                 // -------------------------------------------------------------------------
1260                 // print the JSON header
1261
1262                 buffer_sprintf(wb, "{\n %scols%s:\n     [\n", kq, kq);
1263                 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);
1264                 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);
1265                 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);
1266
1267                 // print the header for each dimension
1268                 // and update the print_hidden array for the dimensions that should be hidden
1269                 int pc = 0;
1270                 for( rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1271                         if(!print_hidden[c]) {
1272                                 pc++;
1273                                 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);
1274                         }
1275                 }
1276                 if(!pc) {
1277                         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);
1278                 }
1279
1280                 // print the begin of row data
1281                 buffer_sprintf(wb, "\n  ],\n    %srows%s:\n     [\n", kq, kq);
1282
1283
1284                 // -------------------------------------------------------------------------
1285                 // the main loop
1286
1287                 int annotate_reset = 0;
1288                 int annotation_count = 0;
1289
1290                 long    t = rrdset_time2slot(st, before),
1291                                 stop_at_t = rrdset_time2slot(st, after),
1292                                 stop_now = 0;
1293
1294                 t -= t % group;
1295
1296                 time_t  now = rrdset_slot2time(st, t),
1297                                 dt = st->update_every;
1298
1299                 long count = 0, printed = 0, group_count = 0;
1300                 last_timestamp = 0;
1301
1302                 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"
1303                                         , st->id
1304                                         , after
1305                                         , before
1306                                         , points
1307                                         , group
1308                                         , st->current_entry
1309                                         , rrdset_first_entry_t(st)
1310                                         , rrdset_last_entry_t(st)
1311                                         , t
1312                                         , stop_at_t
1313                                         );
1314
1315                 for(; !stop_now ; now -= dt, t--) {
1316                         if(t < 0) t = st->entries - 1;
1317                         if(t == stop_at_t) stop_now = 1;
1318
1319                         int print_this = 0;
1320
1321                         if(st->debug) debug(D_RRD_STATS, "%s t = %ld, count = %ld, group_count = %ld, printed = %ld, now = %lu, %s %s"
1322                                         , st->id
1323                                         , t
1324                                         , count + 1
1325                                         , group_count + 1
1326                                         , printed
1327                                         , now
1328                                         , (group_count + 1 == group)?"PRINT":"  -  "
1329                                         , (now >= after && now <= before)?"RANGE":"  -  "
1330                                         );
1331
1332
1333                         // make sure we return data in the proper time range
1334                         if(now > before) continue;
1335                         if(now < after) break;
1336
1337                         //if(rrdset_slot2time(st, t) != now)
1338                         //      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));
1339
1340                         count++;
1341                         group_count++;
1342
1343                         // check if we have to print this now
1344                         if(group_count == group) {
1345                                 if(printed >= points) {
1346                                         // debug(D_RRD_STATS, "Already printed all rows. Stopping.");
1347                                         break;
1348                                 }
1349
1350                                 // generate the local date time
1351                                 struct tm *tm = localtime(&now);
1352                                 if(!tm) { error("localtime() failed."); continue; }
1353                                 if(now > last_timestamp) last_timestamp = now;
1354
1355                                 if(printed) buffer_strcat(wb, "]},\n");
1356                                 buffer_strcat(wb, pre_date);
1357                                 buffer_jsdate(wb, tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
1358                                 buffer_strcat(wb, post_date);
1359
1360                                 print_this = 1;
1361                         }
1362
1363                         // do the calculations
1364                         for(rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1365                                 storage_number n = rd->values[t];
1366                                 calculated_number value = unpack_storage_number(n);
1367
1368                                 if(!does_storage_number_exist(n)) {
1369                                         value = 0.0;
1370                                         found_non_existing[c]++;
1371                                 }
1372                                 if(did_storage_number_reset(n)) annotate_reset = 1;
1373
1374                                 switch(group_method) {
1375                                         case GROUP_MAX:
1376                                                 if(abs(value) > abs(group_values[c])) group_values[c] = value;
1377                                                 break;
1378
1379                                         case GROUP_SUM:
1380                                                 group_values[c] += value;
1381                                                 break;
1382
1383                                         default:
1384                                         case GROUP_AVERAGE:
1385                                                 group_values[c] += value;
1386                                                 if(print_this) group_values[c] /= ( group_count - found_non_existing[c] );
1387                                                 break;
1388                                 }
1389                         }
1390
1391                         if(print_this) {
1392                                 if(annotate_reset) {
1393                                         annotation_count++;
1394                                         buffer_strcat(wb, overflow_annotation);
1395                                         annotate_reset = 0;
1396                                 }
1397                                 else
1398                                         buffer_strcat(wb, normal_annotation);
1399
1400                                 pc = 0;
1401                                 for(c = 0 ; c < dimensions ; c++) {
1402                                         if(found_non_existing[c] == group_count) {
1403                                                 // all entries are non-existing
1404                                                 pc++;
1405                                                 buffer_strcat(wb, pre_value);
1406                                                 buffer_strcat(wb, "null");
1407                                                 buffer_strcat(wb, post_value);
1408                                         }
1409                                         else if(!print_hidden[c]) {
1410                                                 pc++;
1411                                                 buffer_strcat(wb, pre_value);
1412                                                 buffer_rrd_value(wb, group_values[c]);
1413                                                 buffer_strcat(wb, post_value);
1414
1415                                                 if(group_values[c]) found_non_zero[c]++;
1416                                         }
1417
1418                                         // reset them for the next loop
1419                                         group_values[c] = 0;
1420                                         found_non_existing[c] = 0;
1421                                 }
1422
1423                                 // if all dimensions are hidden, print a null
1424                                 if(!pc) {
1425                                         buffer_strcat(wb, pre_value);
1426                                         buffer_strcat(wb, "null");
1427                                         buffer_strcat(wb, post_value);
1428                                 }
1429
1430                                 printed++;
1431                                 group_count = 0;
1432                         }
1433                 }
1434
1435                 if(printed) buffer_strcat(wb, "]}");
1436                 buffer_strcat(wb, "\n   ]\n}\n");
1437
1438                 if(only_non_zero && max_loop > 1) {
1439                         int changed = 0;
1440                         for(rd = st->dimensions, c = 0 ; rd && c < dimensions ; rd = rd->next, c++) {
1441                                 group_values[c] = 0;
1442                                 found_non_existing[c] = 0;
1443
1444                                 if(!print_hidden[c] && !found_non_zero[c]) {
1445                                         changed = 1;
1446                                         print_hidden[c] = 1;
1447                                 }
1448                         }
1449
1450                         if(changed) buffer_flush(wb);
1451                         else break;
1452                 }
1453                 else break;
1454
1455         } // max_loop
1456
1457         debug(D_RRD_STATS, "RRD_STATS_JSON: %s total %ld bytes", st->name, wb->len);
1458
1459         pthread_rwlock_unlock(&st->rwlock);
1460         return last_timestamp;
1461 }