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 "meta_data.h"
32 #include "utils_cache.h" /* for uc_get_rate() */
33 #include "utils_subst.h"
34 #include "utils_vl_lookup.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 = NULL;
88 static pthread_mutex_t agg_instance_list_lock = PTHREAD_MUTEX_INITIALIZER;
89 static agg_instance_t *agg_instance_list_head = NULL;
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 snprintf(inst->ident.plugin_instance, sizeof(inst->ident.plugin_instance),
202 "%s-%s", tmp_plugin, AGG_FUNC_PLACEHOLDER);
203 else if (strcmp("", tmp_plugin_instance) != 0)
204 snprintf(inst->ident.plugin_instance, sizeof(inst->ident.plugin_instance),
205 "%s-%s", tmp_plugin_instance, AGG_FUNC_PLACEHOLDER);
207 snprintf(inst->ident.plugin_instance, sizeof(inst->ident.plugin_instance),
208 "%s-%s-%s", tmp_plugin, tmp_plugin_instance,
209 AGG_FUNC_PLACEHOLDER);
213 sstrncpy(inst->ident.type, agg->ident.type, sizeof(inst->ident.type));
216 COPY_FIELD(inst->ident.type_instance, sizeof(inst->ident.type_instance),
217 type_instance, LU_GROUP_BY_TYPE_INSTANCE, "");
222 } /* }}} int agg_instance_create_name */
224 /* Create a new aggregation instance. */
225 static agg_instance_t *agg_instance_create(data_set_t const *ds, /* {{{ */
226 value_list_t const *vl,
227 aggregation_t *agg) {
228 DEBUG("aggregation plugin: Creating new instance.");
230 agg_instance_t *inst = calloc(1, sizeof(*inst));
232 ERROR("aggregation plugin: calloc() failed.");
235 pthread_mutex_init(&inst->lock, /* attr = */ NULL);
237 inst->ds_type = ds->ds[0].type;
239 agg_instance_create_name(inst, vl, agg);
244 #define INIT_STATE(field) \
246 inst->state_##field = NULL; \
247 if (agg->calc_##field) { \
248 inst->state_##field = calloc(1, sizeof(*inst->state_##field)); \
249 if (inst->state_##field == NULL) { \
250 agg_instance_destroy(inst); \
252 ERROR("aggregation plugin: calloc() failed."); \
267 pthread_mutex_lock(&agg_instance_list_lock);
268 inst->next = agg_instance_list_head;
269 agg_instance_list_head = inst;
270 pthread_mutex_unlock(&agg_instance_list_lock);
273 } /* }}} agg_instance_t *agg_instance_create */
275 /* Update the num, sum, min, max, ... fields of the aggregation instance, if
276 * the rate of the value list is available. Value lists with more than one data
277 * source are not supported and will return an error. Returns zero on success
278 * and non-zero otherwise. */
279 static int agg_instance_update(agg_instance_t *inst, /* {{{ */
280 data_set_t const *ds, value_list_t const *vl) {
281 if (ds->ds_num != 1) {
282 ERROR("aggregation plugin: The \"%s\" type (data set) has more than one "
283 "data source. This is currently not supported by this plugin. "
289 gauge_t *rate = uc_get_rate(ds, vl);
291 char ident[6 * DATA_MAX_NAME_LEN];
292 FORMAT_VL(ident, sizeof(ident), vl);
293 ERROR("aggregation plugin: Unable to read the current rate of \"%s\".",
298 if (isnan(rate[0])) {
303 pthread_mutex_lock(&inst->lock);
306 inst->sum += rate[0];
307 inst->squares_sum += (rate[0] * rate[0]);
309 if (isnan(inst->min) || (inst->min > rate[0]))
311 if (isnan(inst->max) || (inst->max < rate[0]))
314 pthread_mutex_unlock(&inst->lock);
318 } /* }}} int agg_instance_update */
320 static int agg_instance_read_func(agg_instance_t *inst, /* {{{ */
321 char const *func, gauge_t rate,
322 rate_to_value_state_t *state,
323 value_list_t *vl, char const *pi_prefix,
325 if (pi_prefix[0] != 0)
326 subst_string(vl->plugin_instance, sizeof(vl->plugin_instance), pi_prefix,
327 AGG_FUNC_PLACEHOLDER, func);
329 sstrncpy(vl->plugin_instance, func, sizeof(vl->plugin_instance));
333 int status = rate_to_value(&v, rate, state, inst->ds_type, t);
335 /* If this is the first iteration and rate_to_value() was asked to return a
336 * COUNTER or a DERIVE, it will return EAGAIN. Catch this and handle
338 if (status == EAGAIN)
341 WARNING("aggregation plugin: rate_to_value failed with status %i.", status);
348 plugin_dispatch_values(vl);
354 } /* }}} int agg_instance_read_func */
356 static int agg_instance_read(agg_instance_t *inst, cdtime_t t) /* {{{ */
358 value_list_t vl = VALUE_LIST_INIT;
360 /* Pre-set all the fields in the value list that will not change per
361 * aggregation type (sum, average, ...). The struct will be re-used and must
362 * therefore be dispatched using the "secure" function. */
367 vl.meta = meta_data_create();
368 if (vl.meta == NULL) {
369 ERROR("aggregation plugin: meta_data_create failed.");
372 meta_data_add_boolean(vl.meta, "aggregation:created", 1);
374 sstrncpy(vl.host, inst->ident.host, sizeof(vl.host));
375 sstrncpy(vl.plugin, inst->ident.plugin, sizeof(vl.plugin));
376 sstrncpy(vl.type, inst->ident.type, sizeof(vl.type));
377 sstrncpy(vl.type_instance, inst->ident.type_instance,
378 sizeof(vl.type_instance));
380 #define READ_FUNC(func, rate) \
382 if (inst->state_##func != NULL) { \
383 agg_instance_read_func(inst, #func, rate, inst->state_##func, &vl, \
384 inst->ident.plugin_instance, t); \
388 pthread_mutex_lock(&inst->lock);
390 READ_FUNC(num, (gauge_t)inst->num);
392 /* All other aggregations are only defined when there have been any values
395 READ_FUNC(sum, inst->sum);
396 READ_FUNC(average, (inst->sum / ((gauge_t)inst->num)));
397 READ_FUNC(min, inst->min);
398 READ_FUNC(max, inst->max);
399 READ_FUNC(stddev, sqrt((((gauge_t)inst->num) * inst->squares_sum) -
400 (inst->sum * inst->sum)) /
401 ((gauge_t)inst->num));
404 /* Reset internal state. */
407 inst->squares_sum = 0.0;
411 pthread_mutex_unlock(&inst->lock);
413 meta_data_destroy(vl.meta);
417 } /* }}} int agg_instance_read */
419 /* lookup_class_callback_t for utils_vl_lookup */
420 static void *agg_lookup_class_callback(/* {{{ */
421 data_set_t const *ds,
422 value_list_t const *vl,
424 return agg_instance_create(ds, vl, (aggregation_t *)user_class);
425 } /* }}} void *agg_class_callback */
427 /* lookup_obj_callback_t for utils_vl_lookup */
428 static int agg_lookup_obj_callback(data_set_t const *ds, /* {{{ */
429 value_list_t const *vl,
430 __attribute__((unused)) void *user_class,
432 return agg_instance_update((agg_instance_t *)user_obj, ds, vl);
433 } /* }}} int agg_lookup_obj_callback */
435 /* lookup_free_class_callback_t for utils_vl_lookup */
436 static void agg_lookup_free_class_callback(void *user_class) /* {{{ */
438 agg_destroy((aggregation_t *)user_class);
439 } /* }}} void agg_lookup_free_class_callback */
441 /* lookup_free_obj_callback_t for utils_vl_lookup */
442 static void agg_lookup_free_obj_callback(void *user_obj) /* {{{ */
444 agg_instance_destroy((agg_instance_t *)user_obj);
445 } /* }}} void agg_lookup_free_obj_callback */
448 * <Plugin "aggregation">
454 * GroupBy TypeInstance
458 * CalculateAverage true
459 * CalculateMinimum true
460 * CalculateMaximum true
461 * CalculateStddev true
465 static int agg_config_handle_group_by(oconfig_item_t const *ci, /* {{{ */
466 aggregation_t *agg) {
467 for (int i = 0; i < ci->values_num; i++) {
468 if (ci->values[i].type != OCONFIG_TYPE_STRING) {
469 ERROR("aggregation plugin: Argument %i of the \"GroupBy\" option "
475 const char *value = ci->values[i].value.string;
477 if (strcasecmp("Host", value) == 0)
478 agg->group_by |= LU_GROUP_BY_HOST;
479 else if (strcasecmp("Plugin", value) == 0)
480 agg->group_by |= LU_GROUP_BY_PLUGIN;
481 else if (strcasecmp("PluginInstance", value) == 0)
482 agg->group_by |= LU_GROUP_BY_PLUGIN_INSTANCE;
483 else if (strcasecmp("TypeInstance", value) == 0)
484 agg->group_by |= LU_GROUP_BY_TYPE_INSTANCE;
485 else if (strcasecmp("Type", value) == 0)
486 ERROR("aggregation plugin: Grouping by type is not supported.");
488 WARNING("aggregation plugin: The \"%s\" argument to the \"GroupBy\" "
489 "option is invalid and will be ignored.",
491 } /* for (ci->values) */
494 } /* }}} int agg_config_handle_group_by */
496 static int agg_config_aggregation(oconfig_item_t *ci) /* {{{ */
498 aggregation_t *agg = calloc(1, sizeof(*agg));
500 ERROR("aggregation plugin: calloc failed.");
504 sstrncpy(agg->ident.host, "/.*/", sizeof(agg->ident.host));
505 sstrncpy(agg->ident.plugin, "/.*/", sizeof(agg->ident.plugin));
506 sstrncpy(agg->ident.plugin_instance, "/.*/",
507 sizeof(agg->ident.plugin_instance));
508 sstrncpy(agg->ident.type, "/.*/", sizeof(agg->ident.type));
509 sstrncpy(agg->ident.type_instance, "/.*/", sizeof(agg->ident.type_instance));
511 for (int i = 0; i < ci->children_num; i++) {
512 oconfig_item_t *child = ci->children + i;
515 if (strcasecmp("Host", child->key) == 0)
516 status = cf_util_get_string_buffer(child, agg->ident.host,
517 sizeof(agg->ident.host));
518 else if (strcasecmp("Plugin", child->key) == 0)
519 status = cf_util_get_string_buffer(child, agg->ident.plugin,
520 sizeof(agg->ident.plugin));
521 else if (strcasecmp("PluginInstance", child->key) == 0)
522 status = cf_util_get_string_buffer(child, agg->ident.plugin_instance,
523 sizeof(agg->ident.plugin_instance));
524 else if (strcasecmp("Type", child->key) == 0)
525 status = cf_util_get_string_buffer(child, agg->ident.type,
526 sizeof(agg->ident.type));
527 else if (strcasecmp("TypeInstance", child->key) == 0)
528 status = cf_util_get_string_buffer(child, agg->ident.type_instance,
529 sizeof(agg->ident.type_instance));
530 else if (strcasecmp("SetHost", child->key) == 0)
531 status = cf_util_get_string(child, &agg->set_host);
532 else if (strcasecmp("SetPlugin", child->key) == 0)
533 status = cf_util_get_string(child, &agg->set_plugin);
534 else if (strcasecmp("SetPluginInstance", child->key) == 0)
535 status = cf_util_get_string(child, &agg->set_plugin_instance);
536 else if (strcasecmp("SetTypeInstance", child->key) == 0)
537 status = cf_util_get_string(child, &agg->set_type_instance);
538 else if (strcasecmp("GroupBy", child->key) == 0)
539 status = agg_config_handle_group_by(child, agg);
540 else if (strcasecmp("CalculateNum", child->key) == 0)
541 status = cf_util_get_boolean(child, &agg->calc_num);
542 else if (strcasecmp("CalculateSum", child->key) == 0)
543 status = cf_util_get_boolean(child, &agg->calc_sum);
544 else if (strcasecmp("CalculateAverage", child->key) == 0)
545 status = cf_util_get_boolean(child, &agg->calc_average);
546 else if (strcasecmp("CalculateMinimum", child->key) == 0)
547 status = cf_util_get_boolean(child, &agg->calc_min);
548 else if (strcasecmp("CalculateMaximum", child->key) == 0)
549 status = cf_util_get_boolean(child, &agg->calc_max);
550 else if (strcasecmp("CalculateStddev", child->key) == 0)
551 status = cf_util_get_boolean(child, &agg->calc_stddev);
553 WARNING("aggregation plugin: The \"%s\" key is not allowed inside "
554 "<Aggregation /> blocks and will be ignored.",
561 } /* for (int i = 0; i < ci->children_num; i++) */
563 if (agg_is_regex(agg->ident.host))
564 agg->regex_fields |= LU_GROUP_BY_HOST;
565 if (agg_is_regex(agg->ident.plugin))
566 agg->regex_fields |= LU_GROUP_BY_PLUGIN;
567 if (agg_is_regex(agg->ident.plugin_instance))
568 agg->regex_fields |= LU_GROUP_BY_PLUGIN_INSTANCE;
569 if (agg_is_regex(agg->ident.type_instance))
570 agg->regex_fields |= LU_GROUP_BY_TYPE_INSTANCE;
572 /* Sanity checking */
574 if (strcmp("/.*/", agg->ident.type) == 0) /* {{{ */
576 ERROR("aggregation plugin: It appears you did not specify the required "
577 "\"Type\" option in this aggregation. "
578 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
579 "Type \"%s\", TypeInstance \"%s\")",
580 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
581 agg->ident.type, agg->ident.type_instance);
583 } else if (strchr(agg->ident.type, '/') != NULL) {
584 ERROR("aggregation plugin: The \"Type\" may not contain the '/' "
585 "character. Especially, it may not be a regex. The current "
591 /* Check that there is at least one regex field without a grouping. {{{ */
592 if ((agg->regex_fields & ~agg->group_by) == 0) {
593 ERROR("aggregation plugin: An aggregation must contain at least one "
594 "wildcard. This is achieved by leaving at least one of the \"Host\", "
595 "\"Plugin\", \"PluginInstance\" and \"TypeInstance\" options blank "
596 "or using a regular expression and not grouping by that field. "
597 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
598 "Type \"%s\", TypeInstance \"%s\")",
599 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
600 agg->ident.type, agg->ident.type_instance);
604 /* Check that all grouping fields are regular expressions. {{{ */
605 if (agg->group_by & ~agg->regex_fields) {
606 ERROR("aggregation plugin: Only wildcard fields (fields for which a "
607 "regular expression is configured or which are left blank) can be "
608 "specified in the \"GroupBy\" option. "
609 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
610 "Type \"%s\", TypeInstance \"%s\")",
611 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
612 agg->ident.type, agg->ident.type_instance);
616 if (!agg->calc_num && !agg->calc_sum && !agg->calc_average /* {{{ */
617 && !agg->calc_min && !agg->calc_max && !agg->calc_stddev) {
618 ERROR("aggregation plugin: No aggregation function has been specified. "
619 "Without this, I don't know what I should be calculating. "
620 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
621 "Type \"%s\", TypeInstance \"%s\")",
622 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
623 agg->ident.type, agg->ident.type_instance);
627 if (!is_valid) { /* {{{ */
632 int status = lookup_add(lookup, &agg->ident, agg->group_by, agg);
634 ERROR("aggregation plugin: lookup_add failed with status %i.", status);
639 DEBUG("aggregation plugin: Successfully added aggregation: "
640 "(Host \"%s\", Plugin \"%s\", PluginInstance \"%s\", "
641 "Type \"%s\", TypeInstance \"%s\")",
642 agg->ident.host, agg->ident.plugin, agg->ident.plugin_instance,
643 agg->ident.type, agg->ident.type_instance);
645 } /* }}} int agg_config_aggregation */
647 static int agg_config(oconfig_item_t *ci) /* {{{ */
649 pthread_mutex_lock(&agg_instance_list_lock);
651 if (lookup == NULL) {
652 lookup = lookup_create(agg_lookup_class_callback, agg_lookup_obj_callback,
653 agg_lookup_free_class_callback,
654 agg_lookup_free_obj_callback);
655 if (lookup == NULL) {
656 pthread_mutex_unlock(&agg_instance_list_lock);
657 ERROR("aggregation plugin: lookup_create failed.");
662 for (int i = 0; i < ci->children_num; i++) {
663 oconfig_item_t *child = ci->children + i;
665 if (strcasecmp("Aggregation", child->key) == 0)
666 agg_config_aggregation(child);
668 WARNING("aggregation plugin: The \"%s\" key is not allowed inside "
669 "<Plugin aggregation /> blocks and will be ignored.",
673 pthread_mutex_unlock(&agg_instance_list_lock);
676 } /* }}} int agg_config */
678 static int agg_read(void) /* {{{ */
680 cdtime_t t = cdtime();
683 pthread_mutex_lock(&agg_instance_list_lock);
685 /* agg_instance_list_head only holds data, after the "write" callback has
686 * been called with a matching value list at least once. So on startup,
687 * there's a race between the aggregations read() and write() callback. If
688 * the read() callback is called first, agg_instance_list_head is NULL and
689 * "success" may be zero. This is expected and should not result in an error.
690 * Therefore we need to handle this case separately. */
691 if (agg_instance_list_head == NULL) {
692 pthread_mutex_unlock(&agg_instance_list_lock);
696 for (agg_instance_t *this = agg_instance_list_head; this != NULL;
698 int status = agg_instance_read(this, t);
700 WARNING("aggregation plugin: Reading an aggregation instance "
701 "failed with status %i.",
707 pthread_mutex_unlock(&agg_instance_list_lock);
709 return (success > 0) ? 0 : -1;
710 } /* }}} int agg_read */
712 static int agg_write(data_set_t const *ds, value_list_t const *vl, /* {{{ */
713 __attribute__((unused)) user_data_t *user_data) {
714 _Bool created_by_aggregation = 0;
715 /* Ignore values that were created by the aggregation plugin to avoid weird
717 (void)meta_data_get_boolean(vl->meta, "aggregation:created",
718 &created_by_aggregation);
719 if (created_by_aggregation)
727 status = lookup_search(lookup, ds, vl);
733 } /* }}} int agg_write */
735 void module_register(void) {
736 plugin_register_complex_config("aggregation", agg_config);
737 plugin_register_read("aggregation", agg_read);
738 plugin_register_write("aggregation", agg_write, /* user_data = */ NULL);