src/backends.c

   1 #include "common.h"
   2
   3 #define BACKEND_SOURCE_DATA_AS_COLLECTED 0x00000001
   4 #define BACKEND_SOURCE_DATA_AVERAGE      0x00000002
   5 #define BACKEND_SOURCE_DATA_SUM          0x00000004
   6
   7 static inline calculated_number backend_calculate_value_from_stored_data(RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
   8     time_t first_t = rrdset_first_entry_t(st);
   9     time_t last_t = rrdset_last_entry_t(st);
  10
  11     if(unlikely(before < first_t || after > last_t))
  12         // the chart has not been updated in the wanted timeframe
  13         return NAN;
  14
  15     // align the time-frame
  16     // for 'after' also skip the first value by adding st->update_every
  17     after  = after  - after  % st->update_every + st->update_every;
  18     before = before - before % st->update_every;
  19
  20     if(unlikely(after < first_t))
  21         after = first_t;
  22
  23     if(unlikely(after > before))
  24         // this can happen when the st->update_every > before - after
  25         before = after;
  26
  27     if(unlikely(before > last_t))
  28         before = last_t;
  29
  30     size_t counter = 0;
  31     calculated_number sum = 0;
  32
  33     long    start_at_slot = rrdset_time2slot(st, before),
  34             stop_at_slot  = rrdset_time2slot(st, after),
  35             slot, stop_now = 0;
  36
  37     for(slot = start_at_slot; !stop_now ; slot--) {
  38         if(unlikely(slot < 0)) slot = st->entries - 1;
  39         if(unlikely(slot == stop_at_slot)) stop_now = 1;
  40
  41         storage_number n = rd->values[slot];
  42         if(unlikely(!does_storage_number_exist(n))) continue;
  43
  44         calculated_number value = unpack_storage_number(n);
  45         sum += value;
  46         counter++;
  47     }
  48
  49     if(unlikely(!counter))
  50         return NAN;
  51
  52     if(unlikely(options & BACKEND_SOURCE_DATA_SUM))
  53         return sum;
  54
  55     return sum / (calculated_number)counter;
  56 }
  57
  58 static inline int format_dimension_collected_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
  59     (void)host;
  60     (void)after;
  61     (void)before;
  62     (void)options;
  63     buffer_sprintf(b, "%s.%s.%s.%s " COLLECTED_NUMBER_FORMAT " %u\n", prefix, hostname, st->id, rd->id, rd->last_collected_value, (uint32_t)rd->last_collected_time.tv_sec);
  64     return 1;
  65 }
  66
  67 static inline int format_dimension_stored_graphite_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
  68     (void)host;
  69     calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
  70     if(!isnan(value)) {
  71         buffer_sprintf(b, "%s.%s.%s.%s " CALCULATED_NUMBER_FORMAT " %u\n", prefix, hostname, st->id, rd->id, value, (uint32_t) before);
  72         return 1;
  73     }
  74     return 0;
  75 }
  76
  77 static inline int format_dimension_collected_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
  78     (void)host;
  79     (void)after;
  80     (void)before;
  81     (void)options;
  82     buffer_sprintf(b, "put %s.%s.%s %u " COLLECTED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t)rd->last_collected_time.tv_sec, rd->last_collected_value, hostname);
  83     return 1;
  84 }
  85
  86 static inline int format_dimension_stored_opentsdb_telnet(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
  87     (void)host;
  88     calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
  89     if(!isnan(value)) {
  90         buffer_sprintf(b, "put %s.%s.%s %u " CALCULATED_NUMBER_FORMAT " host=%s\n", prefix, st->id, rd->id, (uint32_t) before, value, hostname);
  91         return 1;
  92     }
  93     return 0;
  94 }
  95
  96 static inline int format_dimension_collected_json_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
  97     (void)host;
  98     (void)after;
  99     (void)before;
 100     (void)options;
 101     buffer_sprintf(b, "{"
 102         "\"prefix\":\"%s\","
 103         "\"hostname\":\"%s\","
 104
 105         "\"type\":\"%s\","
 106         "\"family\":\"%s\","
 107         "\"context\": \"%s\","
 108         "\"units\": \"%s\","
 109         "\"title\": \"%s\","
 110
 111         "\"id\":\"%s\","
 112         "\"subid\":\"%s\","
 113         "\"value\":" COLLECTED_NUMBER_FORMAT ","
 114         "\"timestamp\": %u}\n", prefix, hostname, st->type, st->family, st->context, st->units, st->title, st->id, rd->id, rd->last_collected_value, (uint32_t)rd->last_collected_time.tv_sec);
 115     return 1;
 116 }
 117
 118 static inline int format_dimension_stored_json_plaintext(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) {
 119     (void)host;
 120     calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, options);
 121     if(!isnan(value)) {
 122         buffer_sprintf(b, "{"
 123             "\"prefix\":\"%s\","
 124             "\"hostname\":\"%s\","
 125
 126             "\"type\":\"%s\","
 127             "\"family\":\"%s\","
 128             "\"context\": \"%s\","
 129             "\"units\": \"%s\","
 130             "\"title\": \"%s\","
 131
 132             "\"id\":\"%s\","
 133             "\"subid\":\"%s\","
 134             "\"value\":" CALCULATED_NUMBER_FORMAT ","
 135             "\"timestamp\": %u}\n", prefix, hostname, st->type, st->family, st->context, st->units, st->title, st->id, rd->id, value, (uint32_t)before);
 136         return 1;
 137     }
 138     return 0;
 139 }
 140
 141 static inline int process_graphite_response(BUFFER *b) {
 142     char sample[1024];
 143     const char *s = buffer_tostring(b);
 144     char *d = sample, *e = &sample[sizeof(sample) - 1];
 145
 146     for(; *s && d < e ;s++) {
 147         char c = *s;
 148         if(unlikely(!isprint(c))) c = ' ';
 149         *d++ = c;
 150     }
 151     *d = '\0';
 152
 153     info("Received %zu bytes from graphite backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
 154     buffer_flush(b);
 155     return 0;
 156 }
 157
 158 static inline int process_json_response(BUFFER *b) {
 159     char sample[1024];
 160     const char *s = buffer_tostring(b);
 161     char *d = sample, *e = &sample[sizeof(sample) - 1];
 162
 163     for(; *s && d < e ;s++) {
 164         char c = *s;
 165         if(unlikely(!isprint(c))) c = ' ';
 166         *d++ = c;
 167     }
 168     *d = '\0';
 169
 170     info("Received %zu bytes from json backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
 171     buffer_flush(b);
 172     return 0;
 173 }
 174
 175 static inline int process_opentsdb_response(BUFFER *b) {
 176     char sample[1024];
 177     const char *s = buffer_tostring(b);
 178     char *d = sample, *e = &sample[sizeof(sample) - 1];
 179
 180     for(; *s && d < e ;s++) {
 181         char c = *s;
 182         if(unlikely(!isprint(c))) c = ' ';
 183         *d++ = c;
 184     }
 185     *d = '\0';
 186
 187     info("Received %zu bytes from opentsdb backend. Ignoring them. Sample: '%s'", buffer_strlen(b), sample);
 188     buffer_flush(b);
 189     return 0;
 190 }
 191
 192 void *backends_main(void *ptr) {
 193     struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
 194
 195     BUFFER *b = buffer_create(1), *response = buffer_create(1);
 196     int (*backend_request_formatter)(BUFFER *b, const char *prefix, RRDHOST *host, const char *hostname, RRDSET *st, RRDDIM *rd, time_t after, time_t before, uint32_t options) = NULL;
 197     int (*backend_response_checker)(BUFFER *b) = NULL;
 198
 199     info("BACKEND thread created with task id %d", gettid());
 200
 201     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 202         error("Cannot set pthread cancel type to DEFERRED.");
 203
 204     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 205         error("Cannot set pthread cancel state to ENABLE.");
 206
 207     // ------------------------------------------------------------------------
 208     // collect configuration options
 209
 210     struct timeval timeout = {
 211             .tv_sec = 0,
 212             .tv_usec = 0
 213     };
 214     int default_port = 0;
 215     int sock = -1;
 216     uint32_t options;
 217     int enabled = config_get_boolean("backend", "enabled", 0);
 218     const char *source = config_get("backend", "data source", "average");
 219     const char *type = config_get("backend", "type", "graphite");
 220     const char *destination = config_get("backend", "destination", "localhost");
 221     const char *prefix = config_get("backend", "prefix", "netdata");
 222     const char *hostname = config_get("backend", "hostname", localhost.hostname);
 223     int frequency = (int)config_get_number("backend", "update every", 10);
 224     int buffer_on_failures = (int)config_get_number("backend", "buffer on failures", 10);
 225     long timeoutms = config_get_number("backend", "timeout ms", frequency * 2 * 1000);
 226
 227     // ------------------------------------------------------------------------
 228     // validate configuration options
 229     // and prepare for sending data to our backend
 230     if(!enabled || frequency < 1)
 231         goto cleanup;
 232
 233     if(!strcmp(source, "as collected")) {
 234         options = BACKEND_SOURCE_DATA_AS_COLLECTED;
 235     }
 236     else if(!strcmp(source, "average")) {
 237         options = BACKEND_SOURCE_DATA_AVERAGE;
 238     }
 239     else if(!strcmp(source, "sum") || !strcmp(source, "volume")) {
 240         options = BACKEND_SOURCE_DATA_SUM;
 241     }
 242     else {
 243         error("Invalid data source method '%s' for backend given. Disabling backed.", source);
 244         goto cleanup;
 245     }
 246
 247     if(!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) {
 248         default_port = 2003;
 249         if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
 250             backend_request_formatter = format_dimension_collected_graphite_plaintext;
 251         else
 252             backend_request_formatter = format_dimension_stored_graphite_plaintext;
 253
 254         backend_response_checker = process_graphite_response;
 255     }
 256     else if(!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) {
 257         default_port = 4242;
 258         if(options == BACKEND_SOURCE_DATA_AS_COLLECTED)
 259             backend_request_formatter = format_dimension_collected_opentsdb_telnet;
 260         else
 261             backend_request_formatter = format_dimension_stored_opentsdb_telnet;
 262
 263         backend_response_checker = process_opentsdb_response;
 264     }
 265     else if (!strcmp(type, "json") || !strcmp(type, "json:plaintext"))
 266     {
 267         default_port = 5448;
 268
 269         if (options == BACKEND_SOURCE_DATA_AS_COLLECTED)
 270         {
 271             backend_request_formatter = format_dimension_collected_json_plaintext;
 272         }
 273         else
 274         {
 275             backend_request_formatter = format_dimension_stored_json_plaintext;
 276         }
 277
 278         backend_response_checker = process_json_response;
 279     }
 280     else {
 281         error("Unknown backend type '%s'", type);
 282         goto cleanup;
 283     }
 284
 285     if(backend_request_formatter == NULL || backend_response_checker == NULL) {
 286         error("backend is misconfigured - disabling it.");
 287         goto cleanup;
 288     }
 289
 290     if(timeoutms < 1) {
 291         error("BACKED invalid timeout %ld ms given. Assuming %d ms.", timeoutms, frequency * 2 * 1000);
 292         timeoutms = frequency * 2 * 1000;
 293     }
 294     timeout.tv_sec  = (timeoutms * 1000) / 1000000;
 295     timeout.tv_usec = (timeoutms * 1000) % 1000000;
 296
 297     // ------------------------------------------------------------------------
 298     // prepare the charts for monitoring the backend
 299
 300     struct rusage thread;
 301
 302     collected_number
 303             chart_buffered_metrics = 0,
 304             chart_lost_metrics = 0,
 305             chart_sent_metrics = 0,
 306             chart_buffered_bytes = 0,
 307             chart_received_bytes = 0,
 308             chart_sent_bytes = 0,
 309             chart_receptions = 0,
 310             chart_transmission_successes = 0,
 311             chart_transmission_failures = 0,
 312             chart_data_lost_events = 0,
 313             chart_lost_bytes = 0,
 314             chart_backend_reconnects = 0,
 315             chart_backend_latency = 0;
 316
 317     RRDSET *chart_metrics = rrdset_find("netdata.backend_metrics");
 318     if(!chart_metrics) {
 319         chart_metrics = rrdset_create("netdata", "backend_metrics", NULL, "backend", NULL, "Netdata Buffered Metrics", "metrics", 130600, frequency, RRDSET_TYPE_LINE);
 320         rrddim_add(chart_metrics, "buffered", NULL,  1, 1, RRDDIM_ABSOLUTE);
 321         rrddim_add(chart_metrics, "lost",     NULL,  1, 1, RRDDIM_ABSOLUTE);
 322         rrddim_add(chart_metrics, "sent",     NULL,  1, 1, RRDDIM_ABSOLUTE);
 323     }
 324
 325     RRDSET *chart_bytes = rrdset_find("netdata.backend_bytes");
 326     if(!chart_bytes) {
 327         chart_bytes = rrdset_create("netdata", "backend_bytes", NULL, "backend", NULL, "Netdata Backend Data Size", "KB", 130610, frequency, RRDSET_TYPE_AREA);
 328         rrddim_add(chart_bytes, "buffered", NULL, 1, 1024, RRDDIM_ABSOLUTE);
 329         rrddim_add(chart_bytes, "lost",     NULL, 1, 1024, RRDDIM_ABSOLUTE);
 330         rrddim_add(chart_bytes, "sent",     NULL, 1, 1024, RRDDIM_ABSOLUTE);
 331         rrddim_add(chart_bytes, "received", NULL, 1, 1024, RRDDIM_ABSOLUTE);
 332     }
 333
 334     RRDSET *chart_ops = rrdset_find("netdata.backend_ops");
 335     if(!chart_ops) {
 336         chart_ops = rrdset_create("netdata", "backend_ops", NULL, "backend", NULL, "Netdata Backend Operations", "operations", 130630, frequency, RRDSET_TYPE_LINE);
 337         rrddim_add(chart_ops, "write",     NULL, 1, 1, RRDDIM_ABSOLUTE);
 338         rrddim_add(chart_ops, "discard",   NULL, 1, 1, RRDDIM_ABSOLUTE);
 339         rrddim_add(chart_ops, "reconnect", NULL, 1, 1, RRDDIM_ABSOLUTE);
 340         rrddim_add(chart_ops, "failure",   NULL, 1, 1, RRDDIM_ABSOLUTE);
 341         rrddim_add(chart_ops, "read",      NULL, 1, 1, RRDDIM_ABSOLUTE);
 342     }
 343
 344     /*
 345      * this is misleading - we can only measure the time we need to send data
 346      * this time is not related to the time required for the data to travel to
 347      * the backend database and the time that server needed to process them
 348      *
 349      * issue #1432 and https://www.softlab.ntua.gr/facilities/documentation/unix/unix-socket-faq/unix-socket-faq-2.html
 350      *
 351     RRDSET *chart_latency = rrdset_find("netdata.backend_latency");
 352     if(!chart_latency) {
 353         chart_latency = rrdset_create("netdata", "backend_latency", NULL, "backend", NULL, "Netdata Backend Latency", "ms", 130620, frequency, RRDSET_TYPE_AREA);
 354         rrddim_add(chart_latency, "latency",   NULL,  1, 1000, RRDDIM_ABSOLUTE);
 355     }
 356     */
 357
 358     RRDSET *chart_rusage = rrdset_find("netdata.backend_thread_cpu");
 359     if(!chart_rusage) {
 360         chart_rusage = rrdset_create("netdata", "backend_thread_cpu", NULL, "backend", NULL, "NetData Backend Thread CPU usage", "milliseconds/s", 130630, frequency, RRDSET_TYPE_STACKED);
 361         rrddim_add(chart_rusage, "user",   NULL, 1, 1000, RRDDIM_INCREMENTAL);
 362         rrddim_add(chart_rusage, "system", NULL, 1, 1000, RRDDIM_INCREMENTAL);
 363     }
 364
 365     // ------------------------------------------------------------------------
 366     // prepare the backend main loop
 367
 368     info("BACKEND configured ('%s' on '%s' sending '%s' data, every %d seconds, as host '%s', with prefix '%s')", type, destination, source, frequency, hostname, prefix);
 369
 370     usec_t step_ut = frequency * USEC_PER_SEC;
 371     time_t after = now_realtime_sec();
 372     int failures = 0;
 373     heartbeat_t hb;
 374     heartbeat_init(&hb);
 375
 376     for(;;) {
 377         // ------------------------------------------------------------------------
 378         // Wait for the next iteration point.
 379         heartbeat_next(&hb, step_ut);
 380         time_t before = now_realtime_sec();
 381
 382         // ------------------------------------------------------------------------
 383         // add to the buffer the data we need to send to the backend
 384         RRDSET *st;
 385         int pthreadoldcancelstate;
 386
 387         if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
 388             error("Cannot set pthread cancel state to DISABLE.");
 389
 390         rrdhost_rdlock(&localhost);
 391         for(st = localhost.rrdset_root; st ;st = st->next) {
 392             pthread_rwlock_rdlock(&st->rwlock);
 393
 394             RRDDIM *rd;
 395             for(rd = st->dimensions; rd ;rd = rd->next) {
 396                 if(rd->last_collected_time.tv_sec >= after)
 397                     chart_buffered_metrics += backend_request_formatter(b, prefix, &localhost, hostname, st, rd, after, before, options);
 398             }
 399
 400             pthread_rwlock_unlock(&st->rwlock);
 401         }
 402         rrdhost_unlock(&localhost);
 403
 404         if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
 405             error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
 406
 407         // ------------------------------------------------------------------------
 408
 409         chart_buffered_bytes = (collected_number)buffer_strlen(b);
 410
 411         // reset the monitoring chart counters
 412         chart_received_bytes =
 413         chart_sent_bytes =
 414         chart_sent_metrics =
 415         chart_lost_metrics =
 416         chart_transmission_successes =
 417         chart_transmission_failures =
 418         chart_data_lost_events =
 419         chart_lost_bytes =
 420         chart_backend_reconnects =
 421         chart_backend_latency = 0;
 422
 423         if(unlikely(netdata_exit)) break;
 424
 425         //fprintf(stderr, "\nBACKEND BEGIN:\n%s\nBACKEND END\n", buffer_tostring(b)); // FIXME
 426         //fprintf(stderr, "after = %lu, before = %lu\n", after, before);
 427
 428         // prepare for the next iteration
 429         // to add incrementally data to buffer
 430         after = before;
 431
 432         // ------------------------------------------------------------------------
 433         // if we are connected, receive a response, without blocking
 434
 435         if(likely(sock != -1)) {
 436             errno = 0;
 437
 438             // loop through to collect all data
 439             while(sock != -1 && errno != EWOULDBLOCK) {
 440                 buffer_need_bytes(response, 4096);
 441
 442                 ssize_t r = recv(sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
 443                 if(likely(r > 0)) {
 444                     // we received some data
 445                     response->len += r;
 446                     chart_received_bytes += r;
 447                     chart_receptions++;
 448                 }
 449                 else if(r == 0) {
 450                     error("Backend '%s' closed the socket", destination);
 451                     close(sock);
 452                     sock = -1;
 453                 }
 454                 else {
 455                     // failed to receive data
 456                     if(errno != EAGAIN && errno != EWOULDBLOCK) {
 457                         error("Cannot receive data from backend '%s'.", destination);
 458                     }
 459                 }
 460             }
 461
 462             // if we received data, process them
 463             if(buffer_strlen(response))
 464                 backend_response_checker(response);
 465         }
 466
 467         // ------------------------------------------------------------------------
 468         // if we are not connected, connect to a backend server
 469
 470         if(unlikely(sock == -1)) {
 471             usec_t start_ut = now_monotonic_usec();
 472             const char *s = destination;
 473             while(*s) {
 474                 const char *e = s;
 475
 476                 // skip separators, moving both s(tart) and e(nd)
 477                 while(isspace(*e) || *e == ',') s = ++e;
 478
 479                 // move e(nd) to the first separator
 480                 while(*e && !isspace(*e) && *e != ',') e++;
 481
 482                 // is there anything?
 483                 if(!*s || s == e) break;
 484
 485                 char buf[e - s + 1];
 486                 strncpyz(buf, s, e - s);
 487                 chart_backend_reconnects++;
 488                 sock = connect_to(buf, default_port, &timeout);
 489                 if(sock != -1) break;
 490                 s = e;
 491             }
 492             chart_backend_latency += now_monotonic_usec() - start_ut;
 493         }
 494
 495         if(unlikely(netdata_exit)) break;
 496
 497         // ------------------------------------------------------------------------
 498         // if we are connected, send our buffer to the backend server
 499
 500         if(likely(sock != -1)) {
 501             size_t len = buffer_strlen(b);
 502             usec_t start_ut = now_monotonic_usec();
 503             int flags = 0;
 504 #ifdef MSG_NOSIGNAL
 505             flags += MSG_NOSIGNAL;
 506 #endif
 507
 508             ssize_t written = send(sock, buffer_tostring(b), len, flags);
 509             chart_backend_latency += now_monotonic_usec() - start_ut;
 510             if(written != -1 && (size_t)written == len) {
 511                 // we sent the data successfully
 512                 chart_transmission_successes++;
 513                 chart_sent_bytes += written;
 514                 chart_sent_metrics = chart_buffered_metrics;
 515
 516                 // reset the failures count
 517                 failures = 0;
 518
 519                 // empty the buffer
 520                 buffer_flush(b);
 521             }
 522             else {
 523                 // oops! we couldn't send (all or some of the) data
 524                 error("Failed to write data to database backend '%s'. Willing to write %zu bytes, wrote %zd bytes. Will re-connect.", destination, len, written);
 525                 chart_transmission_failures++;
 526
 527                 if(written != -1)
 528                     chart_sent_bytes += written;
 529
 530                 // increment the counter we check for data loss
 531                 failures++;
 532
 533                 // close the socket - we will re-open it next time
 534                 close(sock);
 535                 sock = -1;
 536             }
 537         }
 538         else {
 539             error("Failed to update database backend '%s'", destination);
 540             chart_transmission_failures++;
 541
 542             // increment the counter we check for data loss
 543             failures++;
 544         }
 545
 546         if(failures > buffer_on_failures) {
 547             // too bad! we are going to lose data
 548             chart_lost_bytes += buffer_strlen(b);
 549             error("Reached %d backend failures. Flushing buffers to protect this host - this results in data loss on back-end server '%s'", failures, destination);
 550             buffer_flush(b);
 551             failures = 0;
 552             chart_data_lost_events++;
 553             chart_lost_metrics = chart_buffered_metrics;
 554         }
 555
 556         if(unlikely(netdata_exit)) break;
 557
 558         // ------------------------------------------------------------------------
 559         // update the monitoring charts
 560
 561         if(chart_ops->counter_done) rrdset_next(chart_ops);
 562         rrddim_set(chart_ops, "read",         chart_receptions);
 563         rrddim_set(chart_ops, "write",        chart_transmission_successes);
 564         rrddim_set(chart_ops, "discard",      chart_data_lost_events);
 565         rrddim_set(chart_ops, "failure",      chart_transmission_failures);
 566         rrddim_set(chart_ops, "reconnect",    chart_backend_reconnects);
 567         rrdset_done(chart_ops);
 568
 569         if(chart_metrics->counter_done) rrdset_next(chart_metrics);
 570         rrddim_set(chart_metrics, "buffered", chart_buffered_metrics);
 571         rrddim_set(chart_metrics, "lost",     chart_lost_metrics);
 572         rrddim_set(chart_metrics, "sent",     chart_sent_metrics);
 573         rrdset_done(chart_metrics);
 574
 575         if(chart_bytes->counter_done) rrdset_next(chart_bytes);
 576         rrddim_set(chart_bytes, "buffered",   chart_buffered_bytes);
 577         rrddim_set(chart_bytes, "lost",       chart_lost_bytes);
 578         rrddim_set(chart_bytes, "sent",       chart_sent_bytes);
 579         rrddim_set(chart_bytes, "received",   chart_received_bytes);
 580         rrdset_done(chart_bytes);
 581
 582         /*
 583         if(chart_latency->counter_done) rrdset_next(chart_latency);
 584         rrddim_set(chart_latency, "latency",  chart_backend_latency);
 585         rrdset_done(chart_latency);
 586         */
 587
 588         getrusage(RUSAGE_THREAD, &thread);
 589         if(chart_rusage->counter_done) rrdset_next(chart_rusage);
 590         rrddim_set(chart_rusage, "user",   thread.ru_utime.tv_sec * 1000000ULL + thread.ru_utime.tv_usec);
 591         rrddim_set(chart_rusage, "system", thread.ru_stime.tv_sec * 1000000ULL + thread.ru_stime.tv_usec);
 592         rrdset_done(chart_rusage);
 593
 594         if(likely(buffer_strlen(b) == 0))
 595             chart_buffered_metrics = 0;
 596
 597         if(unlikely(netdata_exit)) break;
 598     }
 599
 600 cleanup:
 601     if(sock != -1)
 602         close(sock);
 603
 604     buffer_free(b);
 605     buffer_free(response);
 606
 607     info("BACKEND thread exiting");
 608
 609     static_thread->enabled = 0;
 610     pthread_exit(NULL);
 611     return NULL;
 612 }