2 * collectd - src/aggregation.c
3 * Copyright (C) 2012 Florian Forster
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Florian Forster <octo at collectd.org>
30 #include "utils/common/common.h"
31 #include "utils/lookup/vl_lookup.h"
32 #include "utils/metadata/meta_data.h"
33 #include "utils_cache.h" /* for uc_get_rate() */
34 #include "utils_subst.h"
36 #define AGG_MATCHES_ALL(str) (strcmp("/.*/", str) == 0)
37 #define AGG_FUNC_PLACEHOLDER "%{aggregation}"
39 struct aggregation_s /* {{{ */
41 lookup_identifier_t ident;
42 unsigned int group_by;
44 unsigned int regex_fields;
48 char *set_plugin_instance;
49 char *set_type_instance;
58 typedef struct aggregation_s aggregation_t;
60 struct agg_instance_s;
61 typedef struct agg_instance_s agg_instance_t;
62 struct agg_instance_s /* {{{ */
65 lookup_identifier_t ident;
76 rate_to_value_state_t *state_num;
77 rate_to_value_state_t *state_sum;
78 rate_to_value_state_t *state_average;
79 rate_to_value_state_t *state_min;
80 rate_to_value_state_t *state_max;
81 rate_to_value_state_t *state_stddev;
86 static lookup_t *lookup;
88 static pthread_mutex_t agg_instance_list_lock = PTHREAD_MUTEX_INITIALIZER;
89 static agg_instance_t *agg_instance_list_head;
91 static bool agg_is_regex(char const *str) /* {{{ */
96 size_t len = strlen(str);
100 if ((str[0] == '/') && (str[len - 1] == '/'))
104 } /* }}} bool agg_is_regex */
106 static void agg_destroy(aggregation_t *agg) /* {{{ */
109 } /* }}} void agg_destroy */
111 /* Frees all dynamically allocated memory within the instance. */
112 static void agg_instance_destroy(agg_instance_t *inst) /* {{{ */
117 /* Remove this instance from the global list of instances. */
118 pthread_mutex_lock(&agg_instance_list_lock);
119 if (agg_instance_list_head == inst)
120 agg_instance_list_head = inst->next;
121 else if (agg_instance_list_head != NULL) {
122 agg_instance_t *prev = agg_instance_list_head;
123 while ((prev != NULL) && (prev->next != inst))
126 prev->next = inst->next;
128 pthread_mutex_unlock(&agg_instance_list_lock);
130 sfree(inst->state_num);
131 sfree(inst->state_sum);
132 sfree(inst->state_average);
133 sfree(inst->state_min);
134 sfree(inst->state_max);
135 sfree(inst->state_stddev);
137 memset(inst, 0, sizeof(*inst));
141 } /* }}} void agg_instance_destroy */
143 static int agg_instance_create_name(agg_instance_t *inst, /* {{{ */
144 value_list_t const *vl,
145 aggregation_t const *agg) {
146 #define COPY_FIELD(buffer, buffer_size, field, group_mask, all_value) \
148 if (agg->set_##field != NULL) \
149 sstrncpy(buffer, agg->set_##field, buffer_size); \
150 else if ((agg->regex_fields & group_mask) && (agg->group_by & group_mask)) \
151 sstrncpy(buffer, vl->field, buffer_size); \
152 else if ((agg->regex_fields & group_mask) && \
153 (AGG_MATCHES_ALL(agg->ident.field))) \
154 sstrncpy(buffer, all_value, buffer_size); \
156 sstrncpy(buffer, agg->ident.field, buffer_size); \
160 COPY_FIELD(inst->ident.host, sizeof(inst->ident.host), host, LU_GROUP_BY_HOST,
164 if (agg->set_plugin != NULL)
165 sstrncpy(inst->ident.plugin, agg->set_plugin, sizeof(inst->ident.plugin));
167 sstrncpy(inst->ident.plugin, "aggregation", sizeof(inst->ident.plugin));
169 /* Plugin instance */
170 if (agg->set_plugin_instance != NULL)
171 sstrncpy(inst->ident.plugin_instance, agg->set_plugin_instance,
172 sizeof(inst->ident.plugin_instance));
174 char tmp_plugin[DATA_MAX_NAME_LEN];
175 char tmp_plugin_instance[DATA_MAX_NAME_LEN] = "";
177 if ((agg->regex_fields & LU_GROUP_BY_PLUGIN) &&
178 (agg->group_by & LU_GROUP_BY_PLUGIN))
179 sstrncpy(tmp_plugin, vl->plugin, sizeof(tmp_plugin));
180 else if ((agg->regex_fields & LU_GROUP_BY_PLUGIN) &&
181 (AGG_MATCHES_ALL(agg->ident.plugin)))
182 sstrncpy(tmp_plugin, "", sizeof(tmp_plugin));
184 sstrncpy(tmp_plugin, agg->ident.plugin, sizeof(tmp_plugin));
186 if ((agg->regex_fields & LU_GROUP_BY_PLUGIN_INSTANCE) &&
187 (agg->group_by & LU_GROUP_BY_PLUGIN_INSTANCE))
188 sstrncpy(tmp_plugin_instance, vl->plugin_instance,
189 sizeof(tmp_plugin_instance));
190 else if ((agg->regex_fields & LU_GROUP_BY_PLUGIN_INSTANCE) &&
191 (AGG_MATCHES_ALL(agg->ident.plugin_instance)))
192 sstrncpy(tmp_plugin_instance, "", sizeof(tmp_plugin_instance));
194 sstrncpy(tmp_plugin_instance, agg->ident.plugin_instance,
195 sizeof(tmp_plugin_instance));
197 if ((strcmp("", tmp_plugin) == 0) && (strcmp("", tmp_plugin_instance) == 0))
198 sstrncpy(inst->ident.plugin_instance, AGG_FUNC_PLACEHOLDER,
199 sizeof(inst->ident.plugin_instance));
200 else if (strcmp("", tmp_plugin) != 0)
201 ssnprintf(inst->ident.plugin_instance,
202 sizeof(inst->ident.plugin_instance), "%s-%s", tmp_plugin,
203 AGG_FUNC_PLACEHOLDER);
204 else if (strcmp("", tmp_plugin_instance) != 0)
205 ssnprintf(inst->ident.plugin_instance,
206 sizeof(inst->ident.plugin_instance), "%s-%s",
207 tmp_plugin_instance, AGG_FUNC_PLACEHOLDER);
209 ssnprintf(inst->ident.plugin_instance,
210 sizeof(inst->ident.plugin_instance), "%s-%s-%s", tmp_plugin,
211 tmp_plugin_instance, AGG_FUNC_PLACEHOLDER);
215 sstrncpy(inst->ident.type, agg->ident.type, sizeof(inst->ident.type));
218 COPY_FIELD(inst->ident.type_instance, sizeof(inst->ident.type_instance),
219 type_instance, LU_GROUP_BY_TYPE_INSTANCE, "");
224 } /* }}} int agg_instance_create_name */
226 /* Create a new aggregation instance. */
227 static agg_instance_t *agg_instance_create(data_set_t const *ds, /* {{{ */
228 value_list_t const *vl,
229 aggregation_t *agg) {
230 DEBUG("aggregation plugin: Creating new instance.");
232 agg_instance_t *inst = calloc(1, sizeof(*inst));
234 ERROR("aggregation plugin: calloc() failed.");
237 pthread_mutex_init(&inst->lock, /* attr = */ NULL);
239 inst->ds_type = ds->ds[0].type;
241 agg_instance_create_name(inst, vl, agg);
246 #define INIT_STATE(field) \
248 inst->state_##field = NULL; \
249 if (agg->calc_##field) { \
250 inst->state_##field = calloc(1, sizeof(*inst->state_##field)); \
251 if (inst->state_##field == NULL) { \
252 agg_instance_destroy(inst); \
254 ERROR("aggregation plugin: calloc() failed."); \
269 pthread_mutex_lock(&agg_instance_list_lock);
270 inst->next = agg_instance_list_head;
271 agg_instance_list_head = inst;
272 pthread_mutex_unlock(&agg_instance_list_lock);
275 } /* }}} agg_instance_t *agg_instance_create */
277 /* Update the num, sum, min, max, ... fields of the aggregation instance, if
278 * the rate of the value list is available. Value lists with more than one data
279 * source are not supported and will return an error. Returns zero on success
280 * and non-zero otherwise. */
281 static int agg_instance_update(agg_instance_t *inst, /* {{{ */
282 data_set_t const *ds, value_list_t const *vl) {
283 if (ds->ds_num != 1) {
284 ERROR("aggregation plugin: The \"%s\" type (data set) has more than one "
285 "data source. This is currently not supported by this plugin. "
291 gauge_t *rate = uc_get_rate(ds, vl);
293 char ident[6 * DATA_MAX_NAME_LEN];
294 FORMAT_VL(ident, sizeof(ident), vl);
295 ERROR("aggregation plugin: Unable to read the current rate of \"%s\".",
300 if (isnan(rate[0])) {
305 pthread_mutex_lock(&inst->lock);
308 inst->sum += rate[0];
309 inst->squares_sum += (rate[0] * rate[0]);
311 if (isnan(inst->min) || (inst->min > rate[0]))
313 if (isnan(inst->max) || (inst->max < rate[0]))
316 pthread_mutex_unlock(&inst->lock);
320 } /* }}} int agg_instance_update */
322 static int agg_instance_read_func(agg_instance_t *inst, /* {{{ */
323 char const *func, gauge_t rate,
324 rate_to_value_state_t *state,
325 value_list_t *vl, char const *pi_prefix,
327 if (pi_prefix[0] != 0)
328 subst_string(vl->plugin_instance, sizeof(vl->plugin_instance), pi_prefix,
329 AGG_FUNC_PLACEHOLDER, func);
331 sstrncpy(vl->plugin_instance, func, sizeof(vl->plugin_instance));
335 int status = rate_to_value(&v, rate, state, inst->ds_type, t);
337 /* If this is the first iteration and rate_to_value() was asked to return a
338 * COUNTER or a DERIVE, it will return EAGAIN. Catch this and handle
340 if (status == EAGAIN)
343 WARNING("aggregation plugin: rate_to_value failed with status %i.", status);
350 plugin_dispatch_values(vl);
356 } /* }}} int agg_instance_read_func */
358 static int agg_instance_read(agg_instance_t *inst, cdtime_t t) /* {{{ */
360 value_list_t vl = VALUE_LIST_INIT;
362 /* Pre-set all the fields in the value list that will not change per
363 * aggregation type (sum, average, ...). The struct will be re-used and must
364 * therefore be dispatched using the "secure" function. */
369 vl.meta = meta_data_create();
370 if (vl.meta == NULL) {
371 ERROR("aggregation plugin: meta_data_create failed.");
374 meta_data_add_boolean(vl.meta, "aggregation:created", 1);
376 sstrncpy(vl.host, inst->ident.host, sizeof(vl.host));
377 sstrncpy(vl.plugin, inst->ident.plugin, sizeof(vl.plugin));
378 sstrncpy(vl.type, inst->ident.type, sizeof(vl.type));
379 sstrncpy(vl.type_instance, inst->ident.type_instance,
380 sizeof(vl.type_instance));
382 #define READ_FUNC(func, rate) \
384 if (inst->state_##func != NULL) { \
385 agg_instance_read_func(inst, #func, rate, inst->state_##func, &vl, \
386 inst->ident.plugin_instance, t); \
390 pthread_mutex_lock(&inst->lock);
392 READ_FUNC(num, (gauge_t)inst->num);
394 /* All other aggregations are only defined when there have been any values
397 READ_FUNC(sum, inst->sum);
398 READ_FUNC(average, (inst->sum / ((gauge_t)inst->num)));
399 READ_FUNC(min, inst->min);
400 READ_FUNC(max, inst->max);
402 sqrt((((gauge_t)inst->num) * inst->squares_sum) -
403 (inst->sum * inst->sum)) /
404 ((gauge_t)inst->num));
407 /* Reset internal state. */
410 inst->squares_sum = 0.0;
414 pthread_mutex_unlock(&inst->lock);
416 meta_data_destroy(vl.meta);
420 } /* }}} int agg_instance_read */
422 /* lookup_class_callback_t for utils_vl_lookup */
423 static void *agg_lookup_class_callback(/* {{{ */
424 data_set_t const *ds,
425 value_list_t const *vl,
427 return agg_instance_create(ds, vl, (aggregation_t *)user_class);
428 } /* }}} void *agg_class_callback */
430 /* lookup_obj_callback_t for utils_vl_lookup */
431 static int agg_lookup_obj_callback(data_set_t const *ds, /* {{{ */
432 value_list_t const *vl,
433 __attribute__((unused)) void *user_class,
435 return agg_instance_update((agg_instance_t *)user_obj, ds, vl);
436 } /* }}} int agg_lookup_obj_callback */
438 /* lookup_free_class_callback_t for utils_vl_lookup */
439 static void agg_lookup_free_class_callback(void *user_class) /* {{{ */
441 agg_destroy((aggregation_t *)user_class);
442 } /* }}} void agg_lookup_free_class_callback */
444 /* lookup_free_obj_callback_t for utils_vl_lookup */
445 static void agg_lookup_free_obj_callback(void *user_obj) /* {{{ */
447 agg_instance_destroy((agg_instance_t *)user_obj);
448 } /* }}} void agg_lookup_free_obj_callback */
451 * <Plugin "aggregation">
457 * GroupBy TypeInstance
461 * CalculateAverage true
462 * CalculateMinimum true
463 * CalculateMaximum true
464 * CalculateStddev true
468 static int agg_config_handle_group_by(oconfig_item_t const *ci, /* {{{ */
469 aggregation_t *agg) {
470 for (int i = 0; i < ci->values_num; i++) {
471 if (ci->values[i].type != OCONFIG_TYPE_STRING) {
472 ERROR("aggregation plugin: Argument %i of the \"GroupBy\" option "
478 const char *value = ci->values[i].value.string;
480 if (strcasecmp("Host", value) == 0)
481 agg->group_by |= LU_GROUP_BY_HOST;
482 else if (strcasecmp("Plugin", value) == 0)
483 agg->group_by |= LU_GROUP_BY_PLUGIN;
484 else if (strcasecmp("PluginInstance", value) == 0)
485 agg->group_by |= LU_GROUP_BY_PLUGIN_INSTANCE;
486 else if (strcasecmp("TypeInstance", value) == 0)
487 agg->group_by |= LU_GROUP_BY_TYPE_INSTANCE;
488 else if (strcasecmp("Type", value) == 0)
489 ERROR("aggregation plugin: Grouping by type is not supported.");
491 WARNING("aggregation plugin: The \"%s\" argument to the \"GroupBy\" "
492 "option is invalid and will be ignored.",
494 } /* for (ci->values) */
497 } /* }}} int agg_config_handle_group_by */
499 static int agg_config_aggregation(oconfig_item_t *ci) /* {{{ */
501 aggregation_t *agg = calloc(1, sizeof(*agg));
503 ERROR("aggregation plugin: calloc failed.");
507 sstrncpy(agg->ident.host, "/.*/", sizeof(agg->ident.host));
508 sstrncpy(agg->ident.plugin, "/.*/", sizeof(agg->ident.plugin));
509 sstrncpy(agg->ident.plugin_instance, "/.*/",
510 sizeof(agg->ident.plugin_instance));
511 sstrncpy(agg->ident.type, "/.*/", sizeof(agg->ident.type));
512 sstrncpy(agg->ident.type_instance, "/.*/", sizeof(agg->ident.type_instance));
514 for (int i = 0; i < ci->children_num; i++) {
515 oconfig_item_t *child = ci->children + i;
518 if (strcasecmp("Host", child->key) == 0)
519 status = cf_util_get_string_buffer(child, agg->ident.host,
520 sizeof(agg->ident.host));
521 else if (strcasecmp("Plugin", child->key) == 0)
522 status = cf_util_get_string_buffer(child, agg->ident.plugin,
523 sizeof(agg->ident.plugin));
524 else if (strcasecmp("PluginInstance", child->key) == 0)
525 status = cf_util_get_string_buffer(child, agg->ident.plugin_instance,
526 sizeof(agg->ident.plugin_instance));
527 else if (strcasecmp("Type", child->key) == 0)
528 status = cf_util_get_string_buffer(child, agg->ident.type,
529 sizeof(agg->ident.type));
530 else if (strcasecmp("TypeInstance", child->key) == 0)
531 status = cf_util_get_string_buffer(child, agg->ident.type_instance,
532 sizeof(agg->ident.type_instance));
533 else if (strcasecmp("SetHost", child->key) == 0)
534 status = cf_util_get_string(child, &agg->set_host);
535 else if (strcasecmp("SetPlugin", child->key) == 0)
536 status = cf_util_get_string(child, &agg->set_plugin);
537 else if (strcasecmp("SetPluginInstance", child->key) == 0)
538 status = cf_util_get_string(child, &agg->set_plugin_instance);
539 else if (strcasecmp("SetTypeInstance", child->key) == 0)
540 status = cf_util_get_string(child, &agg->set_type_instance);
541 else if (strcasecmp("GroupBy", child->key) == 0)
542 status = agg_config_handle_group_by(child, agg);
543 else if (strcasecmp("CalculateNum", child->key) == 0)
544 status = cf_util_get_boolean(child, &agg->calc_num);
545 else if (strcasecmp("CalculateSum", child->key) == 0)
546 status = cf_util_get_boolean(child, &agg->calc_sum);
547 else if (strcasecmp("CalculateAverage", child->key) == 0)
548 status = cf_util_get_boolean(child, &agg->calc_average);
549 else if (strcasecmp("CalculateMinimum", child->key) == 0)
550 status = cf_util_get_boolean(child, &agg->calc_min);
551 else if (strcasecmp("CalculateMaximum", child->key) == 0)
552 status = cf_util_get_boolean(child, &agg->calc_max);
553 else if (strcasecmp("CalculateStddev", child->key) == 0)
554 status = cf_util_get_boolean(child, &agg->calc_stddev);
556 WARNING("aggregation plugin: The \"%s\" key is not allowed inside "
557 "<Aggregation /> blocks and will be ignored.",
564 } /* for (int i = 0; i < ci->children_num; i++) */
566 if (agg_is_regex(agg->ident.host))
567 agg->regex_fields |= LU_GROUP_BY_HOST;
568 if (agg_is_regex(agg->ident.plugin))
569 agg->regex_fields |= LU_GROUP_BY_PLUGIN;
570 if (agg_is_regex(agg->ident.plugin_instance))
571 agg->regex_fields |= LU_GROUP_BY_PLUGIN_INSTANCE;
572 if (agg_is_regex(agg->ident.type_instance))
573 agg->regex_fields |= LU_GROUP_BY_TYPE_INSTANCE;
575 /* Sanity checking */
576 bool is_valid = true;
577 if (strcmp("/.*/", agg->ident.type) == 0) /* {{{ */
579 ERROR("aggregation plugin: It appears you did not specify the required "
580 "\"Type\" option in this aggregation. "
581 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
582 "Type \"%s\", TypeInstance \"%s\")",
583 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
584 agg->ident.type, agg->ident.type_instance);
586 } else if (strchr(agg->ident.type, '/') != NULL) {
587 ERROR("aggregation plugin: The \"Type\" may not contain the '/' "
588 "character. Especially, it may not be a regex. The current "
594 /* Check that there is at least one regex field without a grouping. {{{ */
595 if ((agg->regex_fields & ~agg->group_by) == 0) {
596 ERROR("aggregation plugin: An aggregation must contain at least one "
597 "wildcard. This is achieved by leaving at least one of the \"Host\", "
598 "\"Plugin\", \"PluginInstance\" and \"TypeInstance\" options blank "
599 "or using a regular expression and not grouping by that field. "
600 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
601 "Type \"%s\", TypeInstance \"%s\")",
602 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
603 agg->ident.type, agg->ident.type_instance);
607 /* Check that all grouping fields are regular expressions. {{{ */
608 if (agg->group_by & ~agg->regex_fields) {
609 ERROR("aggregation plugin: Only wildcard fields (fields for which a "
610 "regular expression is configured or which are left blank) can be "
611 "specified in the \"GroupBy\" option. "
612 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
613 "Type \"%s\", TypeInstance \"%s\")",
614 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
615 agg->ident.type, agg->ident.type_instance);
619 if (!agg->calc_num && !agg->calc_sum && !agg->calc_average /* {{{ */
620 && !agg->calc_min && !agg->calc_max && !agg->calc_stddev) {
621 ERROR("aggregation plugin: No aggregation function has been specified. "
622 "Without this, I don't know what I should be calculating. "
623 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
624 "Type \"%s\", TypeInstance \"%s\")",
625 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
626 agg->ident.type, agg->ident.type_instance);
630 if (!is_valid) { /* {{{ */
635 int status = lookup_add(lookup, &agg->ident, agg->group_by, agg);
637 ERROR("aggregation plugin: lookup_add failed with status %i.", status);
642 DEBUG("aggregation plugin: Successfully added aggregation: "
643 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
644 "Type \"%s\", TypeInstance \"%s\")",
645 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
646 agg->ident.type, agg->ident.type_instance);
648 } /* }}} int agg_config_aggregation */
650 static int agg_config(oconfig_item_t *ci) /* {{{ */
652 pthread_mutex_lock(&agg_instance_list_lock);
654 if (lookup == NULL) {
655 lookup = lookup_create(agg_lookup_class_callback, agg_lookup_obj_callback,
656 agg_lookup_free_class_callback,
657 agg_lookup_free_obj_callback);
658 if (lookup == NULL) {
659 pthread_mutex_unlock(&agg_instance_list_lock);
660 ERROR("aggregation plugin: lookup_create failed.");
665 for (int i = 0; i < ci->children_num; i++) {
666 oconfig_item_t *child = ci->children + i;
668 if (strcasecmp("Aggregation", child->key) == 0)
669 agg_config_aggregation(child);
671 WARNING("aggregation plugin: The \"%s\" key is not allowed inside "
672 "<Plugin aggregation /> blocks and will be ignored.",
676 pthread_mutex_unlock(&agg_instance_list_lock);
679 } /* }}} int agg_config */
681 static int agg_read(void) /* {{{ */
683 cdtime_t t = cdtime();
686 pthread_mutex_lock(&agg_instance_list_lock);
688 /* agg_instance_list_head only holds data, after the "write" callback has
689 * been called with a matching value list at least once. So on startup,
690 * there's a race between the aggregations read() and write() callback. If
691 * the read() callback is called first, agg_instance_list_head is NULL and
692 * "success" may be zero. This is expected and should not result in an error.
693 * Therefore we need to handle this case separately. */
694 if (agg_instance_list_head == NULL) {
695 pthread_mutex_unlock(&agg_instance_list_lock);
699 for (agg_instance_t *this = agg_instance_list_head; this != NULL;
701 int status = agg_instance_read(this, t);
703 WARNING("aggregation plugin: Reading an aggregation instance "
704 "failed with status %i.",
710 pthread_mutex_unlock(&agg_instance_list_lock);
712 return (success > 0) ? 0 : -1;
713 } /* }}} int agg_read */
715 static int agg_write(data_set_t const *ds, value_list_t const *vl, /* {{{ */
716 __attribute__((unused)) user_data_t *user_data) {
717 bool created_by_aggregation = false;
718 /* Ignore values that were created by the aggregation plugin to avoid weird
720 (void)meta_data_get_boolean(vl->meta, "aggregation:created",
721 &created_by_aggregation);
722 if (created_by_aggregation)
730 status = lookup_search(lookup, ds, vl);
736 } /* }}} int agg_write */
738 void module_register(void) {
739 plugin_register_complex_config("aggregation", agg_config);
740 plugin_register_read("aggregation", agg_read);
741 plugin_register_write("aggregation", agg_write, /* user_data = */ NULL);