2 * collectd - src/zeromq.c
3 * Copyright (C) 2005-2009 Florian octo Forster
4 * Copyright (C) 2009 Aman Gupta
5 * Copyright (C) 2010 Julien Ammous
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 * Florian octo Forster <octo at verplant.org>
22 * Aman Gupta <aman at tmm1.net>
27 #include "common.h" /* auxiliary functions */
28 #include "plugin.h" /* plugin_register_*, plugin_dispatch_values */
29 #include "utils_cache.h"
35 // copy/paste from network.c ...
37 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
39 static uint64_t stats_values_not_dispatched = 0;
40 static uint64_t stats_values_dispatched = 0;
42 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
43 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
44 * +-------+-----------------------+-------------------------------+
46 * +-------+-----------------------+-------------------------------+
53 typedef struct part_header_s part_header_t;
55 // we do not want to crypt here
58 static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */
60 uint64_t time_sent = 0;
63 status = uc_meta_data_get_unsigned_int (vl,
64 "network:time_sent", &time_sent);
66 /* This is a value we already sent. Don't allow it to be received again in
67 * order to avoid looping. */
68 if ((status == 0) && (time_sent >= ((uint64_t) vl->time)))
72 } /* }}} _Bool check_receive_okay */
74 static int network_dispatch_values (value_list_t *vl, /* {{{ */
79 // DEBUG("host: %s", vl->host);
80 // DEBUG("plugin: %s", vl->plugin);
81 // DEBUG("plugin_instance: %s", vl->plugin_instance);
82 // DEBUG("type: %s", vl->type);
83 // DEBUG("type_instance: %s", vl->type_instance);
86 || (strlen (vl->host) <= 0)
87 || (strlen (vl->plugin) <= 0)
88 || (strlen (vl->type) <= 0))
91 if (!check_receive_okay (vl))
94 char name[6*DATA_MAX_NAME_LEN];
95 FORMAT_VL (name, sizeof (name), vl);
96 name[sizeof (name) - 1] = 0;
97 DEBUG ("network plugin: network_dispatch_values: "
98 "NOT dispatching %s.", name);
100 stats_values_not_dispatched++;
104 assert (vl->meta == NULL);
106 vl->meta = meta_data_create ();
107 if (vl->meta == NULL)
109 ERROR ("network plugin: meta_data_create failed.");
113 status = meta_data_add_boolean (vl->meta, "network:received", 1);
116 ERROR ("network plugin: meta_data_add_boolean failed.");
117 meta_data_destroy (vl->meta);
122 if (username != NULL)
124 status = meta_data_add_string (vl->meta, "network:username", username);
127 ERROR ("network plugin: meta_data_add_string failed.");
128 meta_data_destroy (vl->meta);
134 // DEBUG("dispatching %d values", vl->values_len);
135 plugin_dispatch_values (vl);
136 stats_values_dispatched++;
138 meta_data_destroy (vl->meta);
142 } /* }}} int network_dispatch_values */
144 static int write_part_values (char **ret_buffer, int *ret_buffer_len, const data_set_t *ds, const value_list_t *vl)
150 part_header_t pkg_ph;
151 uint16_t pkg_num_values;
152 uint8_t *pkg_values_types;
158 num_values = vl->values_len;
159 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
160 + (num_values * sizeof (uint8_t))
161 + (num_values * sizeof (value_t));
163 if (*ret_buffer_len < packet_len)
166 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
167 if (pkg_values_types == NULL)
169 ERROR ("network plugin: write_part_values: malloc failed.");
173 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
174 if (pkg_values == NULL)
176 free (pkg_values_types);
177 ERROR ("network plugin: write_part_values: malloc failed.");
181 pkg_ph.type = htons (TYPE_VALUES);
182 pkg_ph.length = htons (packet_len);
184 pkg_num_values = htons ((uint16_t) vl->values_len);
186 for (i = 0; i < num_values; i++)
188 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
189 switch (ds->ds[i].type)
191 case DS_TYPE_COUNTER:
192 pkg_values[i].counter = htonll (vl->values[i].counter);
196 pkg_values[i].gauge = htond (vl->values[i].gauge);
200 pkg_values[i].derive = htonll (vl->values[i].derive);
203 case DS_TYPE_ABSOLUTE:
204 pkg_values[i].absolute = htonll (vl->values[i].absolute);
208 free (pkg_values_types);
210 ERROR ("network plugin: write_part_values: "
211 "Unknown data source type: %i",
214 } /* switch (ds->ds[i].type) */
215 } /* for (num_values) */
218 * Use `memcpy' to write everything to the buffer, because the pointer
219 * may be unaligned and some architectures, such as SPARC, can't handle
222 packet_ptr = *ret_buffer;
224 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
225 offset += sizeof (pkg_ph);
226 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
227 offset += sizeof (pkg_num_values);
228 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
229 offset += num_values * sizeof (uint8_t);
230 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
231 offset += num_values * sizeof (value_t);
233 assert (offset == packet_len);
235 *ret_buffer = packet_ptr + packet_len;
236 *ret_buffer_len -= packet_len;
238 free (pkg_values_types);
242 } /* int write_part_values */
244 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
245 int type, uint64_t value)
250 part_header_t pkg_head;
255 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
257 if (*ret_buffer_len < packet_len)
260 pkg_head.type = htons (type);
261 pkg_head.length = htons (packet_len);
262 pkg_value = htonll (value);
264 packet_ptr = *ret_buffer;
266 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
267 offset += sizeof (pkg_head);
268 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
269 offset += sizeof (pkg_value);
271 assert (offset == packet_len);
273 *ret_buffer = packet_ptr + packet_len;
274 *ret_buffer_len -= packet_len;
277 } /* int write_part_number */
279 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
280 int type, const char *str, int str_len)
290 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
291 if (*ret_buffer_len < buffer_len)
294 pkg_type = htons (type);
295 pkg_length = htons (buffer_len);
297 buffer = *ret_buffer;
299 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
300 offset += sizeof (pkg_type);
301 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
302 offset += sizeof (pkg_length);
303 memcpy (buffer + offset, str, str_len);
305 memset (buffer + offset, '\0', 1);
308 assert (offset == buffer_len);
310 *ret_buffer = buffer + buffer_len;
311 *ret_buffer_len -= buffer_len;
314 } /* int write_part_string */
316 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
317 value_t **ret_values, int *ret_num_values)
319 char *buffer = *ret_buffer;
320 size_t buffer_len = *ret_buffer_len;
335 NOTICE ("network plugin: packet is too short: "
336 "buffer_len = %zu", buffer_len);
340 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
341 buffer += sizeof (tmp16);
342 pkg_type = ntohs (tmp16);
344 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
345 buffer += sizeof (tmp16);
346 pkg_length = ntohs (tmp16);
348 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
349 buffer += sizeof (tmp16);
350 pkg_numval = ntohs (tmp16);
352 assert (pkg_type == TYPE_VALUES);
354 exp_size = 3 * sizeof (uint16_t)
355 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
356 if ((buffer_len < 0) || (buffer_len < exp_size))
358 WARNING ("network plugin: parse_part_values: "
360 "Chunk of size %zu expected, "
361 "but buffer has only %zu bytes left.",
362 exp_size, buffer_len);
366 if (pkg_length != exp_size)
368 WARNING ("network plugin: parse_part_values: "
369 "Length and number of values "
370 "in the packet don't match.");
374 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
375 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
376 if ((pkg_types == NULL) || (pkg_values == NULL))
380 ERROR ("network plugin: parse_part_values: malloc failed.");
384 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
385 buffer += pkg_numval * sizeof (uint8_t);
386 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
387 buffer += pkg_numval * sizeof (value_t);
389 for (i = 0; i < pkg_numval; i++)
391 switch (pkg_types[i])
393 case DS_TYPE_COUNTER:
394 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
398 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
402 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
405 case DS_TYPE_ABSOLUTE:
406 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
410 NOTICE ("network plugin: parse_part_values: "
411 "Don't know how to handle data source type %"PRIu8,
416 } /* switch (pkg_types[i]) */
419 *ret_buffer = buffer;
420 *ret_buffer_len = buffer_len - pkg_length;
421 *ret_num_values = pkg_numval;
422 *ret_values = pkg_values;
427 } /* int parse_part_values */
429 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
430 value_list_t *vl_def,
431 const data_set_t *ds, const value_list_t *vl)
433 char *buffer_orig = buffer;
435 if (write_part_string (&buffer, &buffer_size, TYPE_HOST, vl->host, strlen (vl->host)) != 0)
438 if (write_part_number (&buffer, &buffer_size, TYPE_TIME, (uint64_t) vl->time))
441 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL, (uint64_t) vl->interval))
444 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN, vl->plugin, strlen (vl->plugin)) != 0)
447 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE, vl->plugin_instance, strlen (vl->plugin_instance)) != 0)
450 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE, vl->type, strlen (vl->type)) != 0)
453 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE, vl->type_instance, strlen (vl->type_instance)) != 0)
456 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
459 return (buffer - buffer_orig);
460 } /* }}} int add_to_buffer */
462 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
465 char *buffer = *ret_buffer;
466 size_t buffer_len = *ret_buffer_len;
470 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
475 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
477 WARNING ("network plugin: parse_part_number: "
479 "Chunk of size %zu expected, "
480 "but buffer has only %zu bytes left.",
481 exp_size, buffer_len);
485 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
486 buffer += sizeof (tmp16);
487 pkg_type = ntohs (tmp16);
489 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
490 buffer += sizeof (tmp16);
491 pkg_length = ntohs (tmp16);
493 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
494 buffer += sizeof (tmp64);
495 *value = ntohll (tmp64);
497 *ret_buffer = buffer;
498 *ret_buffer_len = buffer_len - pkg_length;
501 } /* int parse_part_number */
503 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
504 char *output, int output_len)
506 char *buffer = *ret_buffer;
507 size_t buffer_len = *ret_buffer_len;
510 size_t header_size = 2 * sizeof (uint16_t);
515 if ((buffer_len < 0) || (buffer_len < header_size))
517 WARNING ("network plugin: parse_part_string: "
519 "Chunk of at least size %zu expected, "
520 "but buffer has only %zu bytes left.",
521 header_size, buffer_len);
525 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
526 buffer += sizeof (tmp16);
527 pkg_type = ntohs (tmp16);
529 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
530 buffer += sizeof (tmp16);
531 pkg_length = ntohs (tmp16);
533 /* Check that packet fits in the input buffer */
534 if (pkg_length > buffer_len)
536 WARNING ("network plugin: parse_part_string: "
538 "Chunk of size %"PRIu16" received, "
539 "but buffer has only %zu bytes left.",
540 pkg_length, buffer_len);
544 /* Check that pkg_length is in the valid range */
545 if (pkg_length <= header_size)
547 WARNING ("network plugin: parse_part_string: "
549 "Header claims this packet is only %hu "
550 "bytes long.", pkg_length);
554 /* Check that the package data fits into the output buffer.
555 * The previous if-statement ensures that:
556 * `pkg_length > header_size' */
558 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
560 WARNING ("network plugin: parse_part_string: "
561 "Output buffer too small.");
565 /* All sanity checks successfull, let's copy the data over */
566 output_len = pkg_length - header_size;
567 memcpy ((void *) output, (void *) buffer, output_len);
568 buffer += output_len;
570 /* For some very weird reason '\0' doesn't do the trick on SPARC in
572 if (output[output_len - 1] != 0)
574 WARNING ("network plugin: parse_part_string: "
575 "Received string does not end "
576 "with a NULL-byte.");
580 *ret_buffer = buffer;
581 *ret_buffer_len = buffer_len - pkg_length;
584 } /* int parse_part_string */
587 static int parse_packet (void *se, /* {{{ */
588 void *buffer, size_t buffer_size, int flags,
589 const char *username)
593 value_list_t vl = VALUE_LIST_INIT;
597 int packet_was_signed = (flags & PP_SIGNED);
598 int packet_was_encrypted = (flags & PP_ENCRYPTED);
599 int printed_ignore_warning = 0;
600 #endif /* HAVE_LIBGCRYPT */
603 memset (&vl, '\0', sizeof (vl));
604 memset (&n, '\0', sizeof (n));
607 while ((status == 0) && (0 < buffer_size)
608 && ((unsigned int) buffer_size > sizeof (part_header_t)))
613 memcpy ((void *) &pkg_type,
616 memcpy ((void *) &pkg_length,
617 (void *) (buffer + sizeof (pkg_type)),
618 sizeof (pkg_length));
620 pkg_length = ntohs (pkg_length);
621 pkg_type = ntohs (pkg_type);
623 if (pkg_length > buffer_size)
625 /* Ensure that this loop terminates eventually */
626 if (pkg_length < (2 * sizeof (uint16_t)))
629 if (pkg_type == TYPE_ENCR_AES256)
631 // status = parse_part_encr_aes256 (se,
632 // &buffer, &buffer_size, flags);
635 ERROR ("network plugin: Decrypting AES256 "
637 "with status %i.", status);
642 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
643 && (packet_was_encrypted == 0))
645 if (printed_ignore_warning == 0)
647 INFO ("network plugin: Unencrypted packet or "
648 "part has been ignored.");
649 printed_ignore_warning = 1;
651 buffer = ((char *) buffer) + pkg_length;
654 #endif /* HAVE_LIBGCRYPT */
655 else if (pkg_type == TYPE_SIGN_SHA256)
657 // status = parse_part_sign_sha256 (se,
658 // &buffer, &buffer_size, flags);
661 ERROR ("network plugin: Verifying HMAC-SHA-256 "
663 "with status %i.", status);
668 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
669 && (packet_was_encrypted == 0)
670 && (packet_was_signed == 0))
672 if (printed_ignore_warning == 0)
674 INFO ("network plugin: Unsigned packet or "
675 "part has been ignored.");
676 printed_ignore_warning = 1;
678 buffer = ((char *) buffer) + pkg_length;
681 #endif /* HAVE_LIBGCRYPT */
682 else if (pkg_type == TYPE_VALUES)
684 status = parse_part_values (&buffer, &buffer_size,
685 &vl.values, &vl.values_len);
689 network_dispatch_values (&vl, username);
693 else if (pkg_type == TYPE_TIME)
696 status = parse_part_number (&buffer, &buffer_size,
700 vl.time = (time_t) tmp;
701 n.time = (time_t) tmp;
704 else if (pkg_type == TYPE_INTERVAL)
707 status = parse_part_number (&buffer, &buffer_size,
710 vl.interval = (int) tmp;
712 else if (pkg_type == TYPE_HOST)
714 status = parse_part_string (&buffer, &buffer_size,
715 vl.host, sizeof (vl.host));
717 sstrncpy (n.host, vl.host, sizeof (n.host));
719 else if (pkg_type == TYPE_PLUGIN)
721 status = parse_part_string (&buffer, &buffer_size,
722 vl.plugin, sizeof (vl.plugin));
724 sstrncpy (n.plugin, vl.plugin,
727 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
729 status = parse_part_string (&buffer, &buffer_size,
731 sizeof (vl.plugin_instance));
733 sstrncpy (n.plugin_instance,
735 sizeof (n.plugin_instance));
737 else if (pkg_type == TYPE_TYPE)
739 status = parse_part_string (&buffer, &buffer_size,
740 vl.type, sizeof (vl.type));
742 sstrncpy (n.type, vl.type, sizeof (n.type));
744 else if (pkg_type == TYPE_TYPE_INSTANCE)
746 status = parse_part_string (&buffer, &buffer_size,
748 sizeof (vl.type_instance));
750 sstrncpy (n.type_instance, vl.type_instance,
751 sizeof (n.type_instance));
753 else if (pkg_type == TYPE_MESSAGE)
755 status = parse_part_string (&buffer, &buffer_size,
756 n.message, sizeof (n.message));
762 else if ((n.severity != NOTIF_FAILURE)
763 && (n.severity != NOTIF_WARNING)
764 && (n.severity != NOTIF_OKAY))
766 INFO ("network plugin: "
767 "Ignoring notification with "
768 "unknown severity %i.",
771 else if (n.time <= 0)
773 INFO ("network plugin: "
774 "Ignoring notification with "
777 else if (strlen (n.message) <= 0)
779 INFO ("network plugin: "
780 "Ignoring notification with "
781 "an empty message.");
785 plugin_dispatch_notification (&n);
788 else if (pkg_type == TYPE_SEVERITY)
791 status = parse_part_number (&buffer, &buffer_size,
794 n.severity = (int) tmp;
798 DEBUG ("network plugin: parse_packet: Unknown part"
799 " type: 0x%04hx", pkg_type);
800 buffer = ((char *) buffer) + pkg_length;
802 } /* while (buffer_size > sizeof (part_header_t)) */
804 if (status == 0 && buffer_size > 0)
805 WARNING ("network plugin: parse_packet: Received truncated "
806 "packet, try increasing `MaxPacketSize'");
809 } /* }}} int parse_packet */
818 ////////////////////////////
819 //// END OF COPY / PASTE ///
820 ////////////////////////////
825 static const char *config_keys[] =
830 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
833 static char *zmq_listen_on = NULL;
834 static char *zmq_send_to = NULL;
837 static int thread_running = 1;
838 static pthread_t listen_thread_id;
839 static void *zmq_context = NULL;
840 static void *push_socket = NULL;
841 static void *pull_socket = NULL;
848 static int my_config (const char *key, const char *value)
850 if( strcasecmp(key, "ListenOn") == 0 ) {
851 if( zmq_listen_on != NULL ) {
853 zmq_listen_on = NULL;
856 if( (zmq_listen_on = strdup(value)) == NULL ) {
860 else if( strcasecmp(key, "SendDataTo") == 0 ) {
861 if( zmq_send_to != NULL ) {
866 if( (zmq_send_to = strdup(value)) == NULL ) {
875 static void *receive_thread (void __attribute__((unused)) *arg)
882 while( thread_running ) {
883 status = zmq_msg_init(&msg);
884 assert( status == 0 );
885 if( zmq_recv(pull_socket, &msg, 0) != 0 ) {
886 WARNING("zmq_recv : %s", zmq_strerror(errno));
890 data = zmq_msg_data(&msg);
891 data_size = zmq_msg_size(&msg);
893 parse_packet(NULL, data, data_size,
895 /* username = */ NULL);
897 DEBUG("ZeroMQ: received data, parse returned %d", status);
899 if( zmq_msg_close(&msg) != 0 ) {
900 ERROR("zmq_msg_close : %s", zmq_strerror(errno));
908 static int plugin_init (void)
910 int major, minor, patch, status;
911 zmq_version (&major, &minor, &patch);
914 // init zeromq (1 I/O thread)
915 zmq_context = zmq_init(1);
916 if( zmq_context == NULL ) {
917 ERROR("zmq_init : %s", zmq_strerror(errno));
921 // start listening socket
922 if( zmq_listen_on != NULL ) {
923 pull_socket = zmq_socket(zmq_context, ZMQ_PULL);
924 if( pull_socket == NULL ) {
925 ERROR("zmq_socket : %s", zmq_strerror(errno));
929 // and bind it to the inbound queue
930 if( zmq_bind(pull_socket, zmq_listen_on) != 0 ) {
931 ERROR("zmq_bind : %s", zmq_strerror(errno));
935 // listenining thread
936 status = pthread_create(&listen_thread_id,
937 NULL /* no attributes */,
939 NULL /* no argument */);
942 ERROR("network: pthread_create failed: %s", strerror(errno));
946 INFO("ZeroMQ listening on %s", zmq_listen_on);
950 if( zmq_send_to != NULL ) {
951 push_socket = zmq_socket(zmq_context, ZMQ_PUSH);
953 if( push_socket == NULL ) {
954 ERROR("zmq_socket : %s", zmq_strerror(errno));
958 // and connect to remote host
959 if( zmq_connect(push_socket, zmq_send_to) != 0 ) {
960 ERROR("zmq_connect : %s", zmq_strerror(errno));
964 INFO("ZeroMQ pushing to %s", zmq_send_to);
969 INFO("ZeroMQ plugin initialized (zeromq v%d.%d.%d).", major, minor, patch);
975 static int write_notification (const notification_t *n, user_data_t __attribute__((unused)) *user_data)
977 DEBUG("ZeroMQ: received notification, not implemented yet");
981 void free_data(void *data, void *hint)
986 #define PACKET_SIZE 512
988 static int write_value (const data_set_t *ds, const value_list_t *vl,
989 user_data_t __attribute__((unused)) *user_data)
993 int send_buffer_size = PACKET_SIZE, real_size;
995 // do nothing if no socket open
996 if( zmq_send_to == NULL )
999 send_buffer = malloc(PACKET_SIZE);
1000 if( send_buffer == NULL ) {
1001 ERROR("Unable to allocate memory for send_buffer, aborting write");
1006 memset(send_buffer, 0, PACKET_SIZE);
1008 real_size = add_to_buffer(send_buffer, send_buffer_size, &send_buffer_vl, ds, vl);
1010 // zeromq will free the memory when needed by calling the free_data function
1011 if( zmq_msg_init_data(&msg, send_buffer, real_size, free_data, NULL) != 0 ) {
1012 ERROR("zmq_msg_init : %s", zmq_strerror(errno));
1016 // try to send the message
1017 if( zmq_send(push_socket, &msg, ZMQ_NOBLOCK) != 0 ) {
1018 if( errno == EAGAIN ) {
1019 WARNING("ZeroMQ: Cannot send message, queue is full");
1022 ERROR("zmq_send : %s", zmq_strerror(errno));
1027 DEBUG("ZeroMQ: data sent");
1032 static int my_shutdown (void)
1038 DEBUG("ZeroMQ: shutting down");
1040 if( zmq_term(zmq_context) != 0 ) {
1041 ERROR("zmq_term : %s", zmq_strerror(errno));
1045 pthread_join(listen_thread_id, NULL);
1051 void module_register (void)
1053 plugin_register_config("zeromq", my_config, config_keys, config_keys_num);
1054 plugin_register_init("zeromq", plugin_init);
1055 plugin_register_write("zeromq", write_value,
1056 /* user_data = */ NULL);
1057 plugin_register_notification ("network", write_notification,
1058 /* user_data = */ NULL);
1059 plugin_register_shutdown ("zeromq", my_shutdown);