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