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     if(buffer_strlen(host->rrdpush_buffer))
 189         error("STREAM %s [send]: discarding %zu bytes of metrics already in the buffer.", host->hostname, buffer_strlen(host->rrdpush_buffer));
 190
 191     buffer_flush(host->rrdpush_buffer);
 192     rrdpush_sender_thread_reset_all_charts(host);
 193     rrdpush_unlock(host);
 194 }
 195
 196 static inline void rrdpush_sender_thread_lock(RRDHOST *host) {
 197     if(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL) != 0)
 198         error("STREAM %s [send]: cannot set pthread cancel state to DISABLE.", host->hostname);
 199
 200     rrdpush_lock(host);
 201 }
 202
 203 static inline void rrdpush_sender_thread_unlock(RRDHOST *host) {
 204     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 205         error("STREAM %s [send]: cannot set pthread cancel state to DISABLE.", host->hostname);
 206
 207     rrdpush_unlock(host);
 208 }
 209
 210 static void rrdpush_sender_thread_cleanup(RRDHOST *host) {
 211     rrdpush_lock(host);
 212
 213     host->rrdpush_connected = 0;
 214
 215     if(host->rrdpush_socket != -1) {
 216         close(host->rrdpush_socket);
 217         host->rrdpush_socket = -1;
 218     }
 219
 220     // close the pipe
 221     if(host->rrdpush_pipe[PIPE_READ] != -1) {
 222         close(host->rrdpush_pipe[PIPE_READ]);
 223         host->rrdpush_pipe[PIPE_READ] = -1;
 224     }
 225
 226     if(host->rrdpush_pipe[PIPE_WRITE] != -1) {
 227         close(host->rrdpush_pipe[PIPE_WRITE]);
 228         host->rrdpush_pipe[PIPE_WRITE] = -1;
 229     }
 230
 231     buffer_free(host->rrdpush_buffer);
 232     host->rrdpush_buffer = NULL;
 233
 234     host->rrdpush_spawn = 0;
 235
 236     rrdpush_unlock(host);
 237 }
 238
 239 void rrdpush_sender_thread_stop(RRDHOST *host) {
 240     rrdhost_check_wrlock(host);
 241
 242     if(host->rrdpush_spawn) {
 243         info("STREAM %s [send]: stopping sending thread...", host->hostname);
 244         pthread_cancel(host->rrdpush_thread);
 245         rrdpush_sender_thread_cleanup(host);
 246     }
 247 }
 248
 249 void *rrdpush_sender_thread(void *ptr) {
 250     RRDHOST *host = (RRDHOST *)ptr;
 251
 252     info("STREAM %s [send]: thread created (task id %d)", host->hostname, gettid());
 253
 254     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 255         error("STREAM %s [send]: cannot set pthread cancel type to DEFERRED.", host->hostname);
 256
 257     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 258         error("STREAM %s [send]: cannot set pthread cancel state to ENABLE.", host->hostname);
 259
 260     int timeout = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "timeout seconds", 60);
 261     int default_port = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "default port", 19999);
 262     size_t max_size = (size_t)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "buffer size bytes", 1024 * 1024);
 263     unsigned int reconnect_delay = (unsigned int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "reconnect delay seconds", 5);
 264     remote_clock_resync_iterations = (unsigned int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "initial clock resync iterations", remote_clock_resync_iterations);
 265     char connected_to[CONNECTED_TO_SIZE + 1] = "";
 266
 267     if(!host->rrdpush_enabled || !host->rrdpush_destination || !*host->rrdpush_destination || !host->rrdpush_api_key || !*host->rrdpush_api_key)
 268         goto cleanup;
 269
 270     // initialize rrdpush globals
 271     host->rrdpush_buffer = buffer_create(1);
 272     host->rrdpush_connected = 0;
 273     if(pipe(host->rrdpush_pipe) == -1) fatal("STREAM %s [send]: cannot create required pipe.", host->hostname);
 274
 275     // initialize local variables
 276     size_t begin = 0;
 277     size_t reconnects_counter = 0;
 278     size_t sent_bytes = 0;
 279     size_t sent_connection = 0;
 280
 281     struct timeval tv = {
 282             .tv_sec = timeout,
 283             .tv_usec = 0
 284     };
 285
 286     struct pollfd fds[2], *ifd, *ofd;
 287     nfds_t fdmax;
 288
 289     ifd = &fds[0];
 290     ofd = &fds[1];
 291
 292     for(; host->rrdpush_enabled && !netdata_exit ;) {
 293
 294         if(unlikely(host->rrdpush_socket == -1)) {
 295             // stop appending data into rrdpush_buffer
 296             // they will be lost, so there is no point to do it
 297             host->rrdpush_connected = 0;
 298
 299             info("STREAM %s [send to %s]: connecting...", host->hostname, host->rrdpush_destination);
 300             host->rrdpush_socket = connect_to_one_of(host->rrdpush_destination, default_port, &tv, &reconnects_counter, connected_to, CONNECTED_TO_SIZE);
 301
 302             if(unlikely(host->rrdpush_socket == -1)) {
 303                 error("STREAM %s [send to %s]: failed to connect", host->hostname, host->rrdpush_destination);
 304                 sleep(reconnect_delay);
 305                 continue;
 306             }
 307
 308             info("STREAM %s [send to %s]: initializing communication...", host->hostname, connected_to);
 309
 310             char http[1000 + 1];
 311             snprintfz(http, 1000,
 312                     "STREAM key=%s&hostname=%s&machine_guid=%s&os=%s&update_every=%d HTTP/1.1\r\n"
 313                     "User-Agent: netdata-push-service/%s\r\n"
 314                     "Accept: */*\r\n\r\n"
 315                       , host->rrdpush_api_key
 316                       , host->hostname
 317                       , host->machine_guid
 318                       , host->os
 319                       , default_rrd_update_every
 320                       , program_version
 321             );
 322
 323             if(send_timeout(host->rrdpush_socket, http, strlen(http), 0, timeout) == -1) {
 324                 close(host->rrdpush_socket);
 325                 host->rrdpush_socket = -1;
 326                 error("STREAM %s [send to %s]: failed to send http header to netdata", host->hostname, connected_to);
 327                 sleep(reconnect_delay);
 328                 continue;
 329             }
 330
 331             info("STREAM %s [send to %s]: waiting response from remote netdata...", host->hostname, connected_to);
 332
 333             if(recv_timeout(host->rrdpush_socket, http, 1000, 0, timeout) == -1) {
 334                 close(host->rrdpush_socket);
 335                 host->rrdpush_socket = -1;
 336                 error("STREAM %s [send to %s]: failed to initialize communication", host->hostname, connected_to);
 337                 sleep(reconnect_delay);
 338                 continue;
 339             }
 340
 341             if(strncmp(http, START_STREAMING_PROMPT, strlen(START_STREAMING_PROMPT))) {
 342                 close(host->rrdpush_socket);
 343                 host->rrdpush_socket = -1;
 344                 error("STREAM %s [send to %s]: server is not replying properly.", host->hostname, connected_to);
 345                 sleep(reconnect_delay);
 346                 continue;
 347             }
 348
 349             info("STREAM %s [send to %s]: established communication - sending metrics...", host->hostname, connected_to);
 350
 351             if(fcntl(host->rrdpush_socket, F_SETFL, O_NONBLOCK) < 0)
 352                 error("STREAM %s [send to %s]: cannot set non-blocking mode for socket.", host->hostname, connected_to);
 353
 354             rrdpush_sender_thread_data_flush(host);
 355             sent_connection = 0;
 356
 357             // allow appending data into rrdpush_buffer
 358             host->rrdpush_connected = 1;
 359         }
 360
 361         ifd->fd = host->rrdpush_pipe[PIPE_READ];
 362         ifd->events = POLLIN;
 363         ifd->revents = 0;
 364
 365         ofd->fd = host->rrdpush_socket;
 366         ofd->revents = 0;
 367         if(begin < buffer_strlen(host->rrdpush_buffer)) {
 368             ofd->events = POLLOUT;
 369             fdmax = 2;
 370         }
 371         else {
 372             ofd->events = 0;
 373             fdmax = 1;
 374         }
 375
 376         if(netdata_exit) break;
 377         int retval = poll(fds, fdmax, timeout * 1000);
 378         if(netdata_exit) break;
 379
 380         if(unlikely(retval == -1)) {
 381             if(errno == EAGAIN || errno == EINTR)
 382                 continue;
 383
 384             error("STREAM %s [send to %s]: failed to poll().", host->hostname, connected_to);
 385             close(host->rrdpush_socket);
 386             host->rrdpush_socket = -1;
 387             break;
 388         }
 389         else if(unlikely(!retval)) {
 390             // timeout
 391             continue;
 392         }
 393
 394         if(ifd->revents & POLLIN) {
 395             char buffer[1000 + 1];
 396             if(read(host->rrdpush_pipe[PIPE_READ], buffer, 1000) == -1)
 397                 error("STREAM %s [send to %s]: cannot read from internal pipe.", host->hostname, connected_to);
 398         }
 399
 400         if(ofd->revents & POLLOUT && begin < buffer_strlen(host->rrdpush_buffer)) {
 401             rrdpush_sender_thread_lock(host);
 402             ssize_t ret = send(host->rrdpush_socket, &host->rrdpush_buffer->buffer[begin], buffer_strlen(host->rrdpush_buffer) - begin, MSG_DONTWAIT);
 403             if(ret == -1) {
 404                 if(errno != EAGAIN && errno != EINTR) {
 405                     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);
 406                     close(host->rrdpush_socket);
 407                     host->rrdpush_socket = -1;
 408                 }
 409             }
 410             else {
 411                 sent_connection += ret;
 412                 sent_bytes += ret;
 413                 begin += ret;
 414                 if(begin == buffer_strlen(host->rrdpush_buffer)) {
 415                     buffer_flush(host->rrdpush_buffer);
 416                     begin = 0;
 417                 }
 418             }
 419             rrdpush_sender_thread_unlock(host);
 420         }
 421
 422         // protection from overflow
 423         if(host->rrdpush_buffer->len > max_size) {
 424             errno = 0;
 425             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);
 426             if(host->rrdpush_socket != -1) {
 427                 close(host->rrdpush_socket);
 428                 host->rrdpush_socket = -1;
 429             }
 430         }
 431     }
 432
 433 cleanup:
 434     debug(D_WEB_CLIENT, "STREAM %s [send]: sending thread exits.", host->hostname);
 435
 436     rrdpush_sender_thread_cleanup(host);
 437
 438     pthread_exit(NULL);
 439     return NULL;
 440 }
 441
 442
 443 // ----------------------------------------------------------------------------
 444 // rrdpush receiver thread
 445
 446 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) {
 447     RRDHOST *host;
 448     int history = default_rrd_history_entries;
 449     RRD_MEMORY_MODE mode = default_rrd_memory_mode;
 450     int health_enabled = default_health_enabled;
 451     int rrdpush_enabled = default_rrdpush_enabled;
 452     char *rrdpush_destination = default_rrdpush_destination;
 453     char *rrdpush_api_key = default_rrdpush_api_key;
 454     time_t alarms_delay = 60;
 455
 456     update_every = (int)appconfig_get_number(&stream_config, machine_guid, "update every", update_every);
 457     if(update_every < 0) update_every = 1;
 458
 459     history = (int)appconfig_get_number(&stream_config, key, "default history", history);
 460     history = (int)appconfig_get_number(&stream_config, machine_guid, "history", history);
 461     if(history < 5) history = 5;
 462
 463     mode = rrd_memory_mode_id(appconfig_get(&stream_config, key, "default memory mode", rrd_memory_mode_name(mode)));
 464     mode = rrd_memory_mode_id(appconfig_get(&stream_config, machine_guid, "memory mode", rrd_memory_mode_name(mode)));
 465
 466     health_enabled = appconfig_get_boolean_ondemand(&stream_config, key, "health enabled by default", health_enabled);
 467     health_enabled = appconfig_get_boolean_ondemand(&stream_config, machine_guid, "health enabled", health_enabled);
 468
 469     alarms_delay = appconfig_get_number(&stream_config, key, "default postpone alarms on connect seconds", alarms_delay);
 470     alarms_delay = appconfig_get_number(&stream_config, machine_guid, "postpone alarms on connect seconds", alarms_delay);
 471
 472     rrdpush_enabled = appconfig_get_boolean(&stream_config, key, "default proxy enabled", rrdpush_enabled);
 473     rrdpush_enabled = appconfig_get_boolean(&stream_config, machine_guid, "proxy enabled", rrdpush_enabled);
 474
 475     rrdpush_destination = appconfig_get(&stream_config, key, "default proxy destination", rrdpush_destination);
 476     rrdpush_destination = appconfig_get(&stream_config, machine_guid, "proxy destination", rrdpush_destination);
 477
 478     rrdpush_api_key = appconfig_get(&stream_config, key, "default proxy api key", rrdpush_api_key);
 479     rrdpush_api_key = appconfig_get(&stream_config, machine_guid, "proxy api key", rrdpush_api_key);
 480
 481     if(!strcmp(machine_guid, "localhost"))
 482         host = localhost;
 483     else
 484         host = rrdhost_find_or_create(
 485                 hostname
 486                 , machine_guid
 487                 , os
 488                 , update_every
 489                 , history
 490                 , mode
 491                 , (health_enabled != CONFIG_BOOLEAN_NO)
 492                 , (rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key)
 493                 , rrdpush_destination
 494                 , rrdpush_api_key
 495         );
 496
 497     if(!host) {
 498         close(fd);
 499         error("STREAM %s [receive from [%s]:%s]: failed to find/create host structure.", hostname, client_ip, client_port);
 500         return 1;
 501     }
 502
 503 #ifdef NETDATA_INTERNAL_CHECKS
 504     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"
 505          , hostname
 506          , client_ip
 507          , client_port
 508          , host->hostname
 509          , host->machine_guid
 510          , host->rrd_update_every
 511          , host->rrd_history_entries
 512          , rrd_memory_mode_name(host->rrd_memory_mode)
 513          , (health_enabled == CONFIG_BOOLEAN_NO)?"disabled":((health_enabled == CONFIG_BOOLEAN_YES)?"enabled":"auto")
 514     );
 515 #endif // NETDATA_INTERNAL_CHECKS
 516
 517     struct plugind cd = {
 518             .enabled = 1,
 519             .update_every = default_rrd_update_every,
 520             .pid = 0,
 521             .serial_failures = 0,
 522             .successful_collections = 0,
 523             .obsolete = 0,
 524             .started_t = now_realtime_sec(),
 525             .next = NULL,
 526     };
 527
 528     // put the client IP and port into the buffers used by plugins.d
 529     snprintfz(cd.id,           CONFIG_MAX_NAME,  "%s:%s", client_ip, client_port);
 530     snprintfz(cd.filename,     FILENAME_MAX,     "%s:%s", client_ip, client_port);
 531     snprintfz(cd.fullfilename, FILENAME_MAX,     "%s:%s", client_ip, client_port);
 532     snprintfz(cd.cmd,          PLUGINSD_CMD_MAX, "%s:%s", client_ip, client_port);
 533
 534     info("STREAM %s [receive from [%s]:%s]: initializing communication...", host->hostname, client_ip, client_port);
 535     if(send_timeout(fd, START_STREAMING_PROMPT, strlen(START_STREAMING_PROMPT), 0, 60) != strlen(START_STREAMING_PROMPT)) {
 536         error("STREAM %s [receive from [%s]:%s]: cannot send ready command.", host->hostname, client_ip, client_port);
 537         return 0;
 538     }
 539
 540     // remove the non-blocking flag from the socket
 541     if(fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) & ~O_NONBLOCK) == -1)
 542         error("STREAM %s [receive from [%s]:%s]: cannot remove the non-blocking flag from socket %d", host->hostname, client_ip, client_port, fd);
 543
 544     // convert the socket to a FILE *
 545     FILE *fp = fdopen(fd, "r");
 546     if(!fp) {
 547         error("STREAM %s [receive from [%s]:%s]: failed to get a FILE for FD %d.", host->hostname, client_ip, client_port, fd);
 548         return 0;
 549     }
 550
 551     rrdhost_wrlock(host);
 552     host->connected_senders++;
 553     if(health_enabled != CONFIG_BOOLEAN_NO)
 554         host->health_delay_up_to = now_realtime_sec() + alarms_delay;
 555     rrdhost_unlock(host);
 556
 557     // call the plugins.d processor to receive the metrics
 558     info("STREAM %s [receive from [%s]:%s]: receiving metrics...", host->hostname, client_ip, client_port);
 559     size_t count = pluginsd_process(host, &cd, fp, 1);
 560     error("STREAM %s [receive from [%s]:%s]: disconnected (completed updates %zu).", host->hostname, client_ip, client_port, count);
 561
 562     rrdhost_wrlock(host);
 563     host->connected_senders--;
 564     if(!host->connected_senders) {
 565         if(health_enabled == CONFIG_BOOLEAN_AUTO)
 566             host->health_enabled = 0;
 567
 568         host->senders_disconnected_time = now_realtime_sec();
 569
 570         rrdpush_sender_thread_stop(host);
 571     }
 572     rrdhost_unlock(host);
 573
 574     // cleanup
 575     fclose(fp);
 576
 577     return (int)count;
 578 }
 579
 580 struct rrdpush_thread {
 581     int fd;
 582     char *key;
 583     char *hostname;
 584     char *machine_guid;
 585     char *os;
 586     char *client_ip;
 587     char *client_port;
 588     int update_every;
 589 };
 590
 591 void *rrdpush_receiver_thread(void *ptr) {
 592     struct rrdpush_thread *rpt = (struct rrdpush_thread *)ptr;
 593
 594     if (pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 595         error("STREAM %s [receive]: cannot set pthread cancel type to DEFERRED.", rpt->hostname);
 596
 597     if (pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 598         error("STREAM %s [receive]: cannot set pthread cancel state to ENABLE.", rpt->hostname);
 599
 600
 601     info("STREAM %s [%s]:%s: receive thread created (task id %d)", rpt->hostname, rpt->client_ip, rpt->client_port, gettid());
 602     rrdpush_receive(rpt->fd, rpt->key, rpt->hostname, rpt->machine_guid, rpt->os, rpt->update_every, rpt->client_ip, rpt->client_port);
 603     info("STREAM %s [receive from [%s]:%s]: receive thread ended (task id %d)", rpt->hostname, rpt->client_ip, rpt->client_port, gettid());
 604
 605     close(rpt->fd);
 606     freez(rpt->key);
 607     freez(rpt->hostname);
 608     freez(rpt->machine_guid);
 609     freez(rpt->os);
 610     freez(rpt->client_ip);
 611     freez(rpt->client_port);
 612     freez(rpt);
 613
 614     pthread_exit(NULL);
 615     return NULL;
 616 }
 617
 618 void rrdpush_sender_thread_spawn(RRDHOST *host) {
 619     if(pthread_create(&host->rrdpush_thread, NULL, rrdpush_sender_thread, (void *)host))
 620         error("STREAM %s [send]: failed to create new thread for client.", host->hostname);
 621
 622     else if(pthread_detach(host->rrdpush_thread))
 623         error("STREAM %s [send]: cannot request detach newly created thread.", host->hostname);
 624
 625     host->rrdpush_spawn = 1;
 626 }
 627
 628 int rrdpush_receiver_thread_spawn(RRDHOST *host, struct web_client *w, char *url) {
 629     (void)host;
 630
 631     info("STREAM [receive from [%s]:%s]: new client connection.", w->client_ip, w->client_port);
 632
 633     char *key = NULL, *hostname = NULL, *machine_guid = NULL, *os = NULL;
 634     int update_every = default_rrd_update_every;
 635     char buf[GUID_LEN + 1];
 636
 637     while(url) {
 638         char *value = mystrsep(&url, "?&");
 639         if(!value || !*value) continue;
 640
 641         char *name = mystrsep(&value, "=");
 642         if(!name || !*name) continue;
 643         if(!value || !*value) continue;
 644
 645         if(!strcmp(name, "key"))
 646             key = value;
 647         else if(!strcmp(name, "hostname"))
 648             hostname = value;
 649         else if(!strcmp(name, "machine_guid"))
 650             machine_guid = value;
 651         else if(!strcmp(name, "update_every"))
 652             update_every = (int)strtoul(value, NULL, 0);
 653         else if(!strcmp(name, "os"))
 654             os = value;
 655     }
 656
 657     if(!key || !*key) {
 658         error("STREAM [receive from [%s]:%s]: request without an API key. Forbidding access.", w->client_ip, w->client_port);
 659         buffer_flush(w->response.data);
 660         buffer_sprintf(w->response.data, "You need an API key for this request.");
 661         return 401;
 662     }
 663
 664     if(!hostname || !*hostname) {
 665         error("STREAM [receive from [%s]:%s]: request without a hostname. Forbidding access.", w->client_ip, w->client_port);
 666         buffer_flush(w->response.data);
 667         buffer_sprintf(w->response.data, "You need to send a hostname too.");
 668         return 400;
 669     }
 670
 671     if(!machine_guid || !*machine_guid) {
 672         error("STREAM [receive from [%s]:%s]: request without a machine GUID. Forbidding access.", w->client_ip, w->client_port);
 673         buffer_flush(w->response.data);
 674         buffer_sprintf(w->response.data, "You need to send a machine GUID too.");
 675         return 400;
 676     }
 677
 678     if(regenerate_guid(key, buf) == -1) {
 679         error("STREAM [receive from [%s]:%s]: API key '%s' is not valid GUID. Forbidding access.", w->client_ip, w->client_port, key);
 680         buffer_flush(w->response.data);
 681         buffer_sprintf(w->response.data, "Your API key is invalid.");
 682         return 401;
 683     }
 684
 685     if(regenerate_guid(machine_guid, buf) == -1) {
 686         error("STREAM [receive from [%s]:%s]: machine GUID '%s' is not GUID. Forbidding access.", w->client_ip, w->client_port, key);
 687         buffer_flush(w->response.data);
 688         buffer_sprintf(w->response.data, "Your machine GUID is invalid.");
 689         return 404;
 690     }
 691
 692     if(!appconfig_get_boolean(&stream_config, key, "enabled", 0)) {
 693         error("STREAM [receive from [%s]:%s]: API key '%s' is not allowed. Forbidding access.", w->client_ip, w->client_port, machine_guid);
 694         buffer_flush(w->response.data);
 695         buffer_sprintf(w->response.data, "Your API key is not permitted access.");
 696         return 401;
 697     }
 698
 699     if(!appconfig_get_boolean(&stream_config, machine_guid, "enabled", 1)) {
 700         error("STREAM [receive from [%s]:%s]: machine GUID '%s' is not allowed. Forbidding access.", w->client_ip, w->client_port, machine_guid);
 701         buffer_flush(w->response.data);
 702         buffer_sprintf(w->response.data, "Your machine guide is not permitted access.");
 703         return 404;
 704     }
 705
 706     struct rrdpush_thread *rpt = mallocz(sizeof(struct rrdpush_thread));
 707     rpt->fd           = w->ifd;
 708     rpt->key          = strdupz(key);
 709     rpt->hostname     = strdupz(hostname);
 710     rpt->machine_guid = strdupz(machine_guid);
 711     rpt->os           = strdupz(os);
 712     rpt->client_ip    = strdupz(w->client_ip);
 713     rpt->client_port  = strdupz(w->client_port);
 714     rpt->update_every = update_every;
 715     pthread_t thread;
 716
 717     debug(D_SYSTEM, "STREAM [receive from [%s]:%s]: starting receiving thread.", w->client_ip, w->client_port);
 718
 719     if(pthread_create(&thread, NULL, rrdpush_receiver_thread, (void *)rpt))
 720         error("STREAM [receive from [%s]:%s]: failed to create new thread for client.", w->client_ip, w->client_port);
 721
 722     else if(pthread_detach(thread))
 723         error("STREAM [receive from [%s]:%s]: cannot request detach newly created thread.", w->client_ip, w->client_port);
 724
 725     // prevent the caller from closing the streaming socket
 726     if(w->ifd == w->ofd)
 727         w->ifd = w->ofd = -1;
 728     else
 729         w->ifd = -1;
 730
 731     buffer_flush(w->response.data);
 732     return 200;
 733 }