src/rrdpush.c

   1 #include "common.h"
   2
   3 /*
   4  * rrdpush
   5  *
   6  * 3 threads are involved for all stream operations
   7  *
   8  * 1. a random data collection thread, calling rrdset_done_push()
   9  *    this is called for each chart.
  10  *
  11  *    the output of this work is kept in a BUFFER in RRDHOST
  12  *    the sender thread is signalled via a pipe (also in RRDHOST)
  13  *
  14  * 2. a sender thread running at the sending netdata
  15  *    this is spawned automatically on the first chart to be pushed
  16  *
  17  *    It tries to push the metrics to the remote netdata, as fast
  18  *    as possible (i.e. immediately after they are collected).
  19  *
  20  * 3. a receiver thread, running at the receiving netdata
  21  *    this is spawned automatically when the sender connects to
  22  *    the receiver.
  23  *
  24  */
  25
  26 #define START_STREAMING_PROMPT "Hit me baby, push them over..."
  27
  28 int default_rrdpush_enabled = 0;
  29 char *default_rrdpush_destination = NULL;
  30 char *default_rrdpush_api_key = NULL;
  31
  32 int rrdpush_init() {
  33     default_rrdpush_enabled     = appconfig_get_boolean(&stream_config, CONFIG_SECTION_STREAM, "enabled", default_rrdpush_enabled);
  34     default_rrdpush_destination = appconfig_get(&stream_config, CONFIG_SECTION_STREAM, "destination", "");
  35     default_rrdpush_api_key     = appconfig_get(&stream_config, CONFIG_SECTION_STREAM, "api key", "");
  36     rrdhost_free_orphan_time    = appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "free orphan hosts after seconds", rrdhost_free_orphan_time);
  37
  38     if(default_rrdpush_enabled && (!default_rrdpush_destination || !*default_rrdpush_destination || !default_rrdpush_api_key || !*default_rrdpush_api_key)) {
  39         error("STREAM [send]: cannot enable sending thread - information is missing.");
  40         default_rrdpush_enabled = 0;
  41     }
  42
  43     return default_rrdpush_enabled;
  44 }
  45
  46 #define CONNECTED_TO_SIZE 100
  47
  48 // data collection happens from multiple threads
  49 // each of these threads calls rrdset_done()
  50 // which in turn calls rrdset_done_push()
  51 // which uses this pipe to notify the streaming thread
  52 // that there are more data ready to be sent
  53 #define PIPE_READ 0
  54 #define PIPE_WRITE 1
  55
  56 // to have the remote netdata re-sync the charts
  57 // to its current clock, we send for this many
  58 // iterations a BEGIN line without microseconds
  59 // this is for the first iterations of each chart
  60 static unsigned int remote_clock_resync_iterations = 60;
  61
  62 #define rrdpush_lock(host) pthread_mutex_lock(&((host)->rrdpush_mutex))
  63 #define rrdpush_unlock(host) pthread_mutex_unlock(&((host)->rrdpush_mutex))
  64
  65 // checks if the current chart definition has been sent
  66 static inline int need_to_send_chart_definition(RRDSET *st) {
  67     RRDDIM *rd;
  68     rrddim_foreach_read(rd, st)
  69         if(!rd->exposed)
  70             return 1;
  71
  72     return 0;
  73 }
  74
  75 // sends the current chart definition
  76 static inline void send_chart_definition(RRDSET *st) {
  77     buffer_sprintf(st->rrdhost->rrdpush_buffer, "CHART '%s' '%s' '%s' '%s' '%s' '%s' '%s' %ld %d\n"
  78                 , st->id
  79                 , st->name
  80                 , st->title
  81                 , st->units
  82                 , st->family
  83                 , st->context
  84                 , rrdset_type_name(st->chart_type)
  85                 , st->priority
  86                 , st->update_every
  87     );
  88
  89     RRDDIM *rd;
  90     rrddim_foreach_read(rd, st) {
  91         buffer_sprintf(st->rrdhost->rrdpush_buffer, "DIMENSION '%s' '%s' '%s' " COLLECTED_NUMBER_FORMAT " " COLLECTED_NUMBER_FORMAT " '%s %s'\n"
  92                        , rd->id
  93                        , rd->name
  94                        , rrd_algorithm_name(rd->algorithm)
  95                        , rd->multiplier
  96                        , rd->divisor
  97                        , rrddim_flag_check(rd, RRDDIM_FLAG_HIDDEN)?"hidden":""
  98                        , rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)?"noreset":""
  99         );
 100         rd->exposed = 1;
 101     }
 102 }
 103
 104 // sends the current chart dimensions
 105 static inline void send_chart_metrics(RRDSET *st) {
 106     buffer_sprintf(st->rrdhost->rrdpush_buffer, "BEGIN %s %llu\n", st->id, (st->counter_done > remote_clock_resync_iterations)?st->usec_since_last_update:0);
 107
 108     RRDDIM *rd;
 109     rrddim_foreach_read(rd, st) {
 110         if(rd->updated && rd->exposed)
 111             buffer_sprintf(st->rrdhost->rrdpush_buffer, "SET %s = " COLLECTED_NUMBER_FORMAT "\n"
 112                        , rd->id
 113                        , rd->collected_value
 114         );
 115     }
 116
 117     buffer_strcat(st->rrdhost->rrdpush_buffer, "END\n");
 118 }
 119
 120 void rrdpush_sender_thread_spawn(RRDHOST *host);
 121
 122 void rrdset_done_push(RRDSET *st) {
 123     RRDHOST *host = st->rrdhost;
 124
 125     if(unlikely(!rrdset_flag_check(st, RRDSET_FLAG_ENABLED)))
 126         return;
 127
 128     rrdpush_lock(host);
 129
 130     if(unlikely(host->rrdpush_enabled && !host->rrdpush_spawn))
 131         rrdpush_sender_thread_spawn(host);
 132
 133     if(unlikely(!host->rrdpush_buffer || !host->rrdpush_connected)) {
 134         if(unlikely(!host->rrdpush_error_shown))
 135             error("STREAM %s [send]: not ready - discarding collected metrics.", host->hostname);
 136
 137         host->rrdpush_error_shown = 1;
 138
 139         rrdpush_unlock(host);
 140         return;
 141     }
 142     else if(unlikely(host->rrdpush_error_shown)) {
 143         info("STREAM %s [send]: ready - sending metrics...", host->hostname);
 144         host->rrdpush_error_shown = 0;
 145     }
 146
 147     if(need_to_send_chart_definition(st))
 148         send_chart_definition(st);
 149
 150     send_chart_metrics(st);
 151
 152     // signal the sender there are more data
 153     if(write(host->rrdpush_pipe[PIPE_WRITE], " ", 1) == -1)
 154         error("STREAM %s [send]: cannot write to internal pipe", host->hostname);
 155
 156     rrdpush_unlock(host);
 157 }
 158
 159 // ----------------------------------------------------------------------------
 160 // rrdpush sender thread
 161
 162 // resets all the chart, so that their definitions
 163 // will be resent to the central netdata
 164 static void rrdpush_sender_thread_reset_all_charts(RRDHOST *host) {
 165     rrdhost_rdlock(host);
 166
 167     RRDSET *st;
 168     rrdset_foreach_read(st, host) {
 169
 170         // make it re-align the current time
 171         // on the remote host
 172         st->counter_done = 0;
 173
 174         rrdset_rdlock(st);
 175
 176         RRDDIM *rd;
 177         rrddim_foreach_read(rd, st)
 178             rd->exposed = 0;
 179
 180         rrdset_unlock(st);
 181     }
 182
 183     rrdhost_unlock(host);
 184 }
 185
 186 static inline void rrdpush_sender_thread_data_flush(RRDHOST *host) {
 187     rrdpush_lock(host);
 188
 189     if(buffer_strlen(host->rrdpush_buffer))
 190         error("STREAM %s [send]: discarding %zu bytes of metrics already in the buffer.", host->hostname, buffer_strlen(host->rrdpush_buffer));
 191
 192     buffer_flush(host->rrdpush_buffer);
 193
 194     rrdpush_sender_thread_reset_all_charts(host);
 195
 196     rrdpush_unlock(host);
 197 }
 198
 199 static void rrdpush_sender_thread_cleanup_locked_all(RRDHOST *host) {
 200     host->rrdpush_connected = 0;
 201
 202     if(host->rrdpush_socket != -1) {
 203         close(host->rrdpush_socket);
 204         host->rrdpush_socket = -1;
 205     }
 206
 207     // close the pipe
 208     if(host->rrdpush_pipe[PIPE_READ] != -1) {
 209         close(host->rrdpush_pipe[PIPE_READ]);
 210         host->rrdpush_pipe[PIPE_READ] = -1;
 211     }
 212
 213     if(host->rrdpush_pipe[PIPE_WRITE] != -1) {
 214         close(host->rrdpush_pipe[PIPE_WRITE]);
 215         host->rrdpush_pipe[PIPE_WRITE] = -1;
 216     }
 217
 218     buffer_free(host->rrdpush_buffer);
 219     host->rrdpush_buffer = NULL;
 220
 221     host->rrdpush_spawn = 0;
 222 }
 223
 224 void rrdpush_sender_thread_stop(RRDHOST *host) {
 225     rrdpush_lock(host);
 226     rrdhost_wrlock(host);
 227
 228     if(host->rrdpush_spawn) {
 229         info("STREAM %s [send]: stopping sending thread...", host->hostname);
 230         pthread_cancel(host->rrdpush_thread);
 231         rrdpush_sender_thread_cleanup_locked_all(host);
 232     }
 233
 234     rrdhost_unlock(host);
 235     rrdpush_unlock(host);
 236 }
 237
 238 void *rrdpush_sender_thread(void *ptr) {
 239     RRDHOST *host = (RRDHOST *)ptr;
 240
 241     info("STREAM %s [send]: thread created (task id %d)", host->hostname, gettid());
 242
 243     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 244         error("STREAM %s [send]: cannot set pthread cancel type to DEFERRED.", host->hostname);
 245
 246     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 247         error("STREAM %s [send]: cannot set pthread cancel state to ENABLE.", host->hostname);
 248
 249     int timeout = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "timeout seconds", 60);
 250     int default_port = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "default port", 19999);
 251     size_t max_size = (size_t)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "buffer size bytes", 1024 * 1024);
 252     unsigned int reconnect_delay = (unsigned int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "reconnect delay seconds", 5);
 253     remote_clock_resync_iterations = (unsigned int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "initial clock resync iterations", remote_clock_resync_iterations);
 254     char connected_to[CONNECTED_TO_SIZE + 1] = "";
 255
 256     if(!host->rrdpush_enabled || !host->rrdpush_destination || !*host->rrdpush_destination || !host->rrdpush_api_key || !*host->rrdpush_api_key)
 257         goto cleanup;
 258
 259     // initialize rrdpush globals
 260     host->rrdpush_buffer = buffer_create(1);
 261     host->rrdpush_connected = 0;
 262     if(pipe(host->rrdpush_pipe) == -1) fatal("STREAM %s [send]: cannot create required pipe.", host->hostname);
 263
 264     // initialize local variables
 265     size_t begin = 0;
 266     size_t reconnects_counter = 0;
 267     size_t sent_bytes = 0;
 268     size_t sent_connection = 0;
 269
 270     struct timeval tv = {
 271             .tv_sec = timeout,
 272             .tv_usec = 0
 273     };
 274
 275     struct pollfd fds[2], *ifd, *ofd;
 276     nfds_t fdmax;
 277
 278     ifd = &fds[0];
 279     ofd = &fds[1];
 280
 281     for(; host->rrdpush_enabled && !netdata_exit ;) {
 282
 283         if(unlikely(host->rrdpush_socket == -1)) {
 284             // stop appending data into rrdpush_buffer
 285             // they will be lost, so there is no point to do it
 286             host->rrdpush_connected = 0;
 287
 288             info("STREAM %s [send to %s]: connecting...", host->hostname, host->rrdpush_destination);
 289             host->rrdpush_socket = connect_to_one_of(host->rrdpush_destination, default_port, &tv, &reconnects_counter, connected_to, CONNECTED_TO_SIZE);
 290
 291             if(unlikely(host->rrdpush_socket == -1)) {
 292                 error("STREAM %s [send to %s]: failed to connect", host->hostname, host->rrdpush_destination);
 293                 sleep(reconnect_delay);
 294                 continue;
 295             }
 296
 297             info("STREAM %s [send to %s]: initializing communication...", host->hostname, connected_to);
 298
 299             char http[1000 + 1];
 300             snprintfz(http, 1000,
 301                     "STREAM key=%s&hostname=%s&machine_guid=%s&os=%s&update_every=%d HTTP/1.1\r\n"
 302                     "User-Agent: netdata-push-service/%s\r\n"
 303                     "Accept: */*\r\n\r\n"
 304                       , host->rrdpush_api_key
 305                       , host->hostname
 306                       , host->machine_guid
 307                       , host->os
 308                       , default_rrd_update_every
 309                       , program_version
 310             );
 311
 312             if(send_timeout(host->rrdpush_socket, http, strlen(http), 0, timeout) == -1) {
 313                 close(host->rrdpush_socket);
 314                 host->rrdpush_socket = -1;
 315                 error("STREAM %s [send to %s]: failed to send http header to netdata", host->hostname, connected_to);
 316                 sleep(reconnect_delay);
 317                 continue;
 318             }
 319
 320             info("STREAM %s [send to %s]: waiting response from remote netdata...", host->hostname, connected_to);
 321
 322             if(recv_timeout(host->rrdpush_socket, http, 1000, 0, timeout) == -1) {
 323                 close(host->rrdpush_socket);
 324                 host->rrdpush_socket = -1;
 325                 error("STREAM %s [send to %s]: failed to initialize communication", host->hostname, connected_to);
 326                 sleep(reconnect_delay);
 327                 continue;
 328             }
 329
 330             if(strncmp(http, START_STREAMING_PROMPT, strlen(START_STREAMING_PROMPT))) {
 331                 close(host->rrdpush_socket);
 332                 host->rrdpush_socket = -1;
 333                 error("STREAM %s [send to %s]: server is not replying properly.", host->hostname, connected_to);
 334                 sleep(reconnect_delay);
 335                 continue;
 336             }
 337
 338             info("STREAM %s [send to %s]: established communication - sending metrics...", host->hostname, connected_to);
 339
 340             if(fcntl(host->rrdpush_socket, F_SETFL, O_NONBLOCK) < 0)
 341                 error("STREAM %s [send to %s]: cannot set non-blocking mode for socket.", host->hostname, connected_to);
 342
 343             rrdpush_sender_thread_data_flush(host);
 344             sent_connection = 0;
 345
 346             // allow appending data into rrdpush_buffer
 347             host->rrdpush_connected = 1;
 348         }
 349
 350         ifd->fd = host->rrdpush_pipe[PIPE_READ];
 351         ifd->events = POLLIN;
 352         ifd->revents = 0;
 353
 354         ofd->fd = host->rrdpush_socket;
 355         ofd->revents = 0;
 356         if(begin < buffer_strlen(host->rrdpush_buffer)) {
 357             ofd->events = POLLOUT;
 358             fdmax = 2;
 359         }
 360         else {
 361             ofd->events = 0;
 362             fdmax = 1;
 363         }
 364
 365         if(netdata_exit) break;
 366         int retval = poll(fds, fdmax, timeout * 1000);
 367         if(netdata_exit) break;
 368
 369         if(unlikely(retval == -1)) {
 370             if(errno == EAGAIN || errno == EINTR)
 371                 continue;
 372
 373             error("STREAM %s [send to %s]: failed to poll().", host->hostname, connected_to);
 374             close(host->rrdpush_socket);
 375             host->rrdpush_socket = -1;
 376             break;
 377         }
 378         else if(unlikely(!retval)) {
 379             // timeout
 380             continue;
 381         }
 382
 383         if(ifd->revents & POLLIN) {
 384             char buffer[1000 + 1];
 385             if(read(host->rrdpush_pipe[PIPE_READ], buffer, 1000) == -1)
 386                 error("STREAM %s [send to %s]: cannot read from internal pipe.", host->hostname, connected_to);
 387         }
 388
 389         if(ofd->revents & POLLOUT && begin < buffer_strlen(host->rrdpush_buffer)) {
 390
 391             // BEGIN RRDPUSH LOCKED SESSION
 392
 393             // during this session, data collectors
 394             // will not be able to append data to our buffer
 395             // but the socket is in non-blocking mode
 396             // so, we will not block at send()
 397
 398             if(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL) != 0)
 399                 error("STREAM %s [send]: cannot set pthread cancel state to DISABLE.", host->hostname);
 400
 401             rrdpush_lock(host);
 402
 403             ssize_t ret = send(host->rrdpush_socket, &host->rrdpush_buffer->buffer[begin], buffer_strlen(host->rrdpush_buffer) - begin, MSG_DONTWAIT);
 404             if(ret == -1) {
 405                 if(errno != EAGAIN && errno != EINTR) {
 406                     error("STREAM %s [send to %s]: failed to send metrics - closing connection - we have sent %zu bytes on this connection.", host->hostname, connected_to, sent_connection);
 407                     close(host->rrdpush_socket);
 408                     host->rrdpush_socket = -1;
 409                 }
 410             }
 411             else {
 412                 sent_connection += ret;
 413                 sent_bytes += ret;
 414                 begin += ret;
 415                 if(begin == buffer_strlen(host->rrdpush_buffer)) {
 416                     // we send it all
 417
 418                     buffer_flush(host->rrdpush_buffer);
 419                     begin = 0;
 420                 }
 421             }
 422
 423             rrdpush_unlock(host);
 424
 425             if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 426                 error("STREAM %s [send]: cannot set pthread cancel state to ENABLE.", host->hostname);
 427
 428             // END RRDPUSH LOCKED SESSION
 429         }
 430
 431         // protection from overflow
 432         if(host->rrdpush_buffer->len > max_size) {
 433             errno = 0;
 434             error("STREAM %s [send to %s]: too many data pending - buffer is %zu bytes long, %zu unsent - we have sent %zu bytes in total, %zu on this connection. Closing connection to flush the data.", host->hostname, connected_to, host->rrdpush_buffer->len, host->rrdpush_buffer->len - begin, sent_bytes, sent_connection);
 435             if(host->rrdpush_socket != -1) {
 436                 close(host->rrdpush_socket);
 437                 host->rrdpush_socket = -1;
 438             }
 439         }
 440     }
 441
 442 cleanup:
 443     debug(D_WEB_CLIENT, "STREAM %s [send]: sending thread exits.", host->hostname);
 444
 445     rrdpush_lock(host);
 446     rrdhost_wrlock(host);
 447     rrdpush_sender_thread_cleanup_locked_all(host);
 448     rrdhost_unlock(host);
 449     rrdpush_unlock(host);
 450
 451     pthread_exit(NULL);
 452     return NULL;
 453 }
 454
 455
 456 // ----------------------------------------------------------------------------
 457 // rrdpush receiver thread
 458
 459 int rrdpush_receive(int fd, const char *key, const char *hostname, const char *machine_guid, const char *os, int update_every, char *client_ip, char *client_port) {
 460     RRDHOST *host;
 461     int history = default_rrd_history_entries;
 462     RRD_MEMORY_MODE mode = default_rrd_memory_mode;
 463     int health_enabled = default_health_enabled;
 464     int rrdpush_enabled = default_rrdpush_enabled;
 465     char *rrdpush_destination = default_rrdpush_destination;
 466     char *rrdpush_api_key = default_rrdpush_api_key;
 467     time_t alarms_delay = 60;
 468
 469     update_every = (int)appconfig_get_number(&stream_config, machine_guid, "update every", update_every);
 470     if(update_every < 0) update_every = 1;
 471
 472     history = (int)appconfig_get_number(&stream_config, key, "default history", history);
 473     history = (int)appconfig_get_number(&stream_config, machine_guid, "history", history);
 474     if(history < 5) history = 5;
 475
 476     mode = rrd_memory_mode_id(appconfig_get(&stream_config, key, "default memory mode", rrd_memory_mode_name(mode)));
 477     mode = rrd_memory_mode_id(appconfig_get(&stream_config, machine_guid, "memory mode", rrd_memory_mode_name(mode)));
 478
 479     health_enabled = appconfig_get_boolean_ondemand(&stream_config, key, "health enabled by default", health_enabled);
 480     health_enabled = appconfig_get_boolean_ondemand(&stream_config, machine_guid, "health enabled", health_enabled);
 481
 482     alarms_delay = appconfig_get_number(&stream_config, key, "default postpone alarms on connect seconds", alarms_delay);
 483     alarms_delay = appconfig_get_number(&stream_config, machine_guid, "postpone alarms on connect seconds", alarms_delay);
 484
 485     rrdpush_enabled = appconfig_get_boolean(&stream_config, key, "default proxy enabled", rrdpush_enabled);
 486     rrdpush_enabled = appconfig_get_boolean(&stream_config, machine_guid, "proxy enabled", rrdpush_enabled);
 487
 488     rrdpush_destination = appconfig_get(&stream_config, key, "default proxy destination", rrdpush_destination);
 489     rrdpush_destination = appconfig_get(&stream_config, machine_guid, "proxy destination", rrdpush_destination);
 490
 491     rrdpush_api_key = appconfig_get(&stream_config, key, "default proxy api key", rrdpush_api_key);
 492     rrdpush_api_key = appconfig_get(&stream_config, machine_guid, "proxy api key", rrdpush_api_key);
 493
 494     if(!strcmp(machine_guid, "localhost"))
 495         host = localhost;
 496     else
 497         host = rrdhost_find_or_create(
 498                 hostname
 499                 , machine_guid
 500                 , os
 501                 , update_every
 502                 , history
 503                 , mode
 504                 , (health_enabled != CONFIG_BOOLEAN_NO)
 505                 , (rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key)
 506                 , rrdpush_destination
 507                 , rrdpush_api_key
 508         );
 509
 510     if(!host) {
 511         close(fd);
 512         error("STREAM %s [receive from [%s]:%s]: failed to find/create host structure.", hostname, client_ip, client_port);
 513         return 1;
 514     }
 515
 516 #ifdef NETDATA_INTERNAL_CHECKS
 517     info("STREAM %s [receive from [%s]:%s]: client willing to stream metrics for host '%s' with machine_guid '%s': update every = %d, history = %d, memory mode = %s, health %s"
 518          , hostname
 519          , client_ip
 520          , client_port
 521          , host->hostname
 522          , host->machine_guid
 523          , host->rrd_update_every
 524          , host->rrd_history_entries
 525          , rrd_memory_mode_name(host->rrd_memory_mode)
 526          , (health_enabled == CONFIG_BOOLEAN_NO)?"disabled":((health_enabled == CONFIG_BOOLEAN_YES)?"enabled":"auto")
 527     );
 528 #endif // NETDATA_INTERNAL_CHECKS
 529
 530     struct plugind cd = {
 531             .enabled = 1,
 532             .update_every = default_rrd_update_every,
 533             .pid = 0,
 534             .serial_failures = 0,
 535             .successful_collections = 0,
 536             .obsolete = 0,
 537             .started_t = now_realtime_sec(),
 538             .next = NULL,
 539     };
 540
 541     // put the client IP and port into the buffers used by plugins.d
 542     snprintfz(cd.id,           CONFIG_MAX_NAME,  "%s:%s", client_ip, client_port);
 543     snprintfz(cd.filename,     FILENAME_MAX,     "%s:%s", client_ip, client_port);
 544     snprintfz(cd.fullfilename, FILENAME_MAX,     "%s:%s", client_ip, client_port);
 545     snprintfz(cd.cmd,          PLUGINSD_CMD_MAX, "%s:%s", client_ip, client_port);
 546
 547     info("STREAM %s [receive from [%s]:%s]: initializing communication...", host->hostname, client_ip, client_port);
 548     if(send_timeout(fd, START_STREAMING_PROMPT, strlen(START_STREAMING_PROMPT), 0, 60) != strlen(START_STREAMING_PROMPT)) {
 549         error("STREAM %s [receive from [%s]:%s]: cannot send ready command.", host->hostname, client_ip, client_port);
 550         close(fd);
 551         return 0;
 552     }
 553
 554     // remove the non-blocking flag from the socket
 555     if(fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) & ~O_NONBLOCK) == -1)
 556         error("STREAM %s [receive from [%s]:%s]: cannot remove the non-blocking flag from socket %d", host->hostname, client_ip, client_port, fd);
 557
 558     // convert the socket to a FILE *
 559     FILE *fp = fdopen(fd, "r");
 560     if(!fp) {
 561         error("STREAM %s [receive from [%s]:%s]: failed to get a FILE for FD %d.", host->hostname, client_ip, client_port, fd);
 562         close(fd);
 563         return 0;
 564     }
 565
 566     rrdhost_wrlock(host);
 567     host->connected_senders++;
 568     if(health_enabled != CONFIG_BOOLEAN_NO)
 569         host->health_delay_up_to = now_realtime_sec() + alarms_delay;
 570     rrdhost_unlock(host);
 571
 572     // call the plugins.d processor to receive the metrics
 573     info("STREAM %s [receive from [%s]:%s]: receiving metrics...", host->hostname, client_ip, client_port);
 574     size_t count = pluginsd_process(host, &cd, fp, 1);
 575     error("STREAM %s [receive from [%s]:%s]: disconnected (completed updates %zu).", host->hostname, client_ip, client_port, count);
 576
 577     rrdhost_wrlock(host);
 578     host->connected_senders--;
 579     if(!host->connected_senders) {
 580         if(health_enabled == CONFIG_BOOLEAN_AUTO)
 581             host->health_enabled = 0;
 582
 583         host->senders_disconnected_time = now_realtime_sec();
 584     }
 585     rrdhost_unlock(host);
 586
 587     rrdpush_sender_thread_stop(host);
 588
 589     // cleanup
 590     fclose(fp);
 591
 592     return (int)count;
 593 }
 594
 595 struct rrdpush_thread {
 596     int fd;
 597     char *key;
 598     char *hostname;
 599     char *machine_guid;
 600     char *os;
 601     char *client_ip;
 602     char *client_port;
 603     int update_every;
 604 };
 605
 606 void *rrdpush_receiver_thread(void *ptr) {
 607     struct rrdpush_thread *rpt = (struct rrdpush_thread *)ptr;
 608
 609     if (pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 610         error("STREAM %s [receive]: cannot set pthread cancel type to DEFERRED.", rpt->hostname);
 611
 612     if (pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 613         error("STREAM %s [receive]: cannot set pthread cancel state to ENABLE.", rpt->hostname);
 614
 615
 616     info("STREAM %s [%s]:%s: receive thread created (task id %d)", rpt->hostname, rpt->client_ip, rpt->client_port, gettid());
 617     rrdpush_receive(rpt->fd, rpt->key, rpt->hostname, rpt->machine_guid, rpt->os, rpt->update_every, rpt->client_ip, rpt->client_port);
 618     info("STREAM %s [receive from [%s]:%s]: receive thread ended (task id %d)", rpt->hostname, rpt->client_ip, rpt->client_port, gettid());
 619
 620     freez(rpt->key);
 621     freez(rpt->hostname);
 622     freez(rpt->machine_guid);
 623     freez(rpt->os);
 624     freez(rpt->client_ip);
 625     freez(rpt->client_port);
 626     freez(rpt);
 627
 628     pthread_exit(NULL);
 629     return NULL;
 630 }
 631
 632 void rrdpush_sender_thread_spawn(RRDHOST *host) {
 633     rrdhost_wrlock(host);
 634
 635     if(!host->rrdpush_spawn) {
 636         if(pthread_create(&host->rrdpush_thread, NULL, rrdpush_sender_thread, (void *) host))
 637             error("STREAM %s [send]: failed to create new thread for client.", host->hostname);
 638
 639         else if(pthread_detach(host->rrdpush_thread))
 640             error("STREAM %s [send]: cannot request detach newly created thread.", host->hostname);
 641
 642         host->rrdpush_spawn = 1;
 643     }
 644
 645     rrdhost_unlock(host);
 646 }
 647
 648 int rrdpush_receiver_thread_spawn(RRDHOST *host, struct web_client *w, char *url) {
 649     (void)host;
 650
 651     info("STREAM [receive from [%s]:%s]: new client connection.", w->client_ip, w->client_port);
 652
 653     char *key = NULL, *hostname = NULL, *machine_guid = NULL, *os = "unknown";
 654     int update_every = default_rrd_update_every;
 655     char buf[GUID_LEN + 1];
 656
 657     while(url) {
 658         char *value = mystrsep(&url, "?&");
 659         if(!value || !*value) continue;
 660
 661         char *name = mystrsep(&value, "=");
 662         if(!name || !*name) continue;
 663         if(!value || !*value) continue;
 664
 665         if(!strcmp(name, "key"))
 666             key = value;
 667         else if(!strcmp(name, "hostname"))
 668             hostname = value;
 669         else if(!strcmp(name, "machine_guid"))
 670             machine_guid = value;
 671         else if(!strcmp(name, "update_every"))
 672             update_every = (int)strtoul(value, NULL, 0);
 673         else if(!strcmp(name, "os"))
 674             os = value;
 675     }
 676
 677     if(!key || !*key) {
 678         error("STREAM [receive from [%s]:%s]: request without an API key. Forbidding access.", w->client_ip, w->client_port);
 679         buffer_flush(w->response.data);
 680         buffer_sprintf(w->response.data, "You need an API key for this request.");
 681         return 401;
 682     }
 683
 684     if(!hostname || !*hostname) {
 685         error("STREAM [receive from [%s]:%s]: request without a hostname. Forbidding access.", w->client_ip, w->client_port);
 686         buffer_flush(w->response.data);
 687         buffer_sprintf(w->response.data, "You need to send a hostname too.");
 688         return 400;
 689     }
 690
 691     if(!machine_guid || !*machine_guid) {
 692         error("STREAM [receive from [%s]:%s]: request without a machine GUID. Forbidding access.", w->client_ip, w->client_port);
 693         buffer_flush(w->response.data);
 694         buffer_sprintf(w->response.data, "You need to send a machine GUID too.");
 695         return 400;
 696     }
 697
 698     if(regenerate_guid(key, buf) == -1) {
 699         error("STREAM [receive from [%s]:%s]: API key '%s' is not valid GUID. Forbidding access.", w->client_ip, w->client_port, key);
 700         buffer_flush(w->response.data);
 701         buffer_sprintf(w->response.data, "Your API key is invalid.");
 702         return 401;
 703     }
 704
 705     if(regenerate_guid(machine_guid, buf) == -1) {
 706         error("STREAM [receive from [%s]:%s]: machine GUID '%s' is not GUID. Forbidding access.", w->client_ip, w->client_port, key);
 707         buffer_flush(w->response.data);
 708         buffer_sprintf(w->response.data, "Your machine GUID is invalid.");
 709         return 404;
 710     }
 711
 712     if(!appconfig_get_boolean(&stream_config, key, "enabled", 0)) {
 713         error("STREAM [receive from [%s]:%s]: API key '%s' is not allowed. Forbidding access.", w->client_ip, w->client_port, machine_guid);
 714         buffer_flush(w->response.data);
 715         buffer_sprintf(w->response.data, "Your API key is not permitted access.");
 716         return 401;
 717     }
 718
 719     if(!appconfig_get_boolean(&stream_config, machine_guid, "enabled", 1)) {
 720         error("STREAM [receive from [%s]:%s]: machine GUID '%s' is not allowed. Forbidding access.", w->client_ip, w->client_port, machine_guid);
 721         buffer_flush(w->response.data);
 722         buffer_sprintf(w->response.data, "Your machine guide is not permitted access.");
 723         return 404;
 724     }
 725
 726     struct rrdpush_thread *rpt = mallocz(sizeof(struct rrdpush_thread));
 727     rpt->fd           = w->ifd;
 728     rpt->key          = strdupz(key);
 729     rpt->hostname     = strdupz(hostname);
 730     rpt->machine_guid = strdupz(machine_guid);
 731     rpt->os           = strdupz(os);
 732     rpt->client_ip    = strdupz(w->client_ip);
 733     rpt->client_port  = strdupz(w->client_port);
 734     rpt->update_every = update_every;
 735     pthread_t thread;
 736
 737     debug(D_SYSTEM, "STREAM [receive from [%s]:%s]: starting receiving thread.", w->client_ip, w->client_port);
 738
 739     if(pthread_create(&thread, NULL, rrdpush_receiver_thread, (void *)rpt))
 740         error("STREAM [receive from [%s]:%s]: failed to create new thread for client.", w->client_ip, w->client_port);
 741
 742     else if(pthread_detach(thread))
 743         error("STREAM [receive from [%s]:%s]: cannot request detach newly created thread.", w->client_ip, w->client_port);
 744
 745     // prevent the caller from closing the streaming socket
 746     if(w->ifd == w->ofd)
 747         w->ifd = w->ofd = -1;
 748     else
 749         w->ifd = -1;
 750
 751     buffer_flush(w->response.data);
 752     return 200;
 753 }