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