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netdata/database/rrdsetvar.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rrd.h"
typedef struct rrdsetvar {
STRING *name; // variable name
void *value; // we need this to maintain the allocation for custom chart variables
const RRDVAR_ACQUIRED *rrdvar_local;
const RRDVAR_ACQUIRED *rrdvar_family_chart_id;
const RRDVAR_ACQUIRED *rrdvar_family_chart_name;
const RRDVAR_ACQUIRED *rrdvar_host_chart_id;
const RRDVAR_ACQUIRED *rrdvar_host_chart_name;
RRDVAR_FLAGS flags:24;
RRDVAR_TYPE type:8;
} RRDSETVAR;
// should only be called while the rrdsetvar dict is write locked
// otherwise, 2+ threads may be setting the same variables at the same time
static inline void rrdsetvar_free_rrdvars_unsafe(RRDSET *st, RRDSETVAR *rs) {
RRDHOST *host = st->rrdhost;
// ------------------------------------------------------------------------
// CHART
if(st->rrdvars) {
rrdvar_release_and_del(st->rrdvars, rs->rrdvar_local);
rs->rrdvar_local = NULL;
}
// ------------------------------------------------------------------------
// FAMILY
if(st->rrdfamily) {
rrdvar_release_and_del(rrdfamily_rrdvars_dict(st->rrdfamily), rs->rrdvar_family_chart_id);
rs->rrdvar_family_chart_id = NULL;
rrdvar_release_and_del(rrdfamily_rrdvars_dict(st->rrdfamily), rs->rrdvar_family_chart_name);
rs->rrdvar_family_chart_name = NULL;
}
// ------------------------------------------------------------------------
// HOST
if(host->rrdvars && host->health_enabled) {
rrdvar_release_and_del(host->rrdvars, rs->rrdvar_host_chart_id);
rs->rrdvar_host_chart_id = NULL;
rrdvar_release_and_del(host->rrdvars, rs->rrdvar_host_chart_name);
rs->rrdvar_host_chart_name = NULL;
}
}
// should only be called while the rrdsetvar dict is write locked
// otherwise, 2+ threads may be setting the same variables at the same time
static inline void rrdsetvar_update_rrdvars_unsafe(RRDSET *st, RRDSETVAR *rs) {
RRDHOST *host = st->rrdhost;
RRDVAR_FLAGS options = rs->flags;
options &= ~RRDVAR_OPTIONS_REMOVED_WHEN_PROPAGATING_TO_RRDVAR;
// ------------------------------------------------------------------------
// free the old ones (if any)
rrdsetvar_free_rrdvars_unsafe(st, rs);
// ------------------------------------------------------------------------
// KEYS
char buffer[RRDVAR_MAX_LENGTH + 1];
snprintfz(buffer, RRDVAR_MAX_LENGTH, "%s.%s", rrdset_id(st), string2str(rs->name));
STRING *key_chart_id = string_strdupz(buffer);
snprintfz(buffer, RRDVAR_MAX_LENGTH, "%s.%s", rrdset_name(st), string2str(rs->name));
STRING *key_chart_name = string_strdupz(buffer);
// ------------------------------------------------------------------------
// CHART
if(st->rrdvars) {
rs->rrdvar_local = rrdvar_add_and_acquire("local", st->rrdvars, rs->name, rs->type, options, rs->value);
}
// ------------------------------------------------------------------------
// FAMILY
if(st->rrdfamily) {
rs->rrdvar_family_chart_id = rrdvar_add_and_acquire("family", rrdfamily_rrdvars_dict(st->rrdfamily), key_chart_id, rs->type, options, rs->value);
rs->rrdvar_family_chart_name = rrdvar_add_and_acquire("family", rrdfamily_rrdvars_dict(st->rrdfamily), key_chart_name, rs->type, options, rs->value);
}
// ------------------------------------------------------------------------
// HOST
if(host->rrdvars && host->health_enabled) {
rs->rrdvar_host_chart_id = rrdvar_add_and_acquire("host", host->rrdvars, key_chart_id, rs->type, options, rs->value);
rs->rrdvar_host_chart_name = rrdvar_add_and_acquire("host", host->rrdvars, key_chart_name, rs->type, options, rs->value);
}
// free the keys
string_freez(key_chart_id);
string_freez(key_chart_name);
}
static void rrdsetvar_free_value_unsafe(RRDSETVAR *rs) {
if(rs->flags & RRDVAR_FLAG_ALLOCATED) {
void *old = rs->value;
rs->value = NULL;
rs->flags &= ~RRDVAR_FLAG_ALLOCATED;
freez(old);
}
}
static void rrdsetvar_set_value_unsafe(RRDSETVAR *rs, void *new_value) {
rrdsetvar_free_value_unsafe(rs);
if(new_value)
rs->value = new_value;
else {
NETDATA_DOUBLE *n = mallocz(sizeof(NETDATA_DOUBLE));
*n = NAN;
rs->value = n;
rs->flags |= RRDVAR_FLAG_ALLOCATED;
}
}
struct rrdsetvar_constructor {
RRDSET *rrdset;
const char *name;
void *value;
RRDVAR_FLAGS flags :16;
RRDVAR_TYPE type:8;
};
static void rrdsetvar_insert_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdsetvar, void *constructor_data) {
RRDSETVAR *rs = rrdsetvar;
struct rrdsetvar_constructor *ctr = constructor_data;
ctr->flags &= ~RRDVAR_OPTIONS_REMOVED_ON_NEW_OBJECTS;
rs->name = string_strdupz(ctr->name);
rs->type = ctr->type;
rs->flags = ctr->flags;
rrdsetvar_set_value_unsafe(rs, ctr->value);
// create the rrdvariables while we are having a write lock to the dictionary
rrdsetvar_update_rrdvars_unsafe(ctr->rrdset, rs);
}
static bool rrdsetvar_conflict_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdsetvar, void *new_rrdsetvar __maybe_unused, void *constructor_data) {
RRDSETVAR *rs = rrdsetvar;
struct rrdsetvar_constructor *ctr = constructor_data;
ctr->flags &= ~RRDVAR_OPTIONS_REMOVED_ON_NEW_OBJECTS;
RRDVAR_FLAGS options = rs->flags;
options &= ~RRDVAR_OPTIONS_REMOVED_ON_NEW_OBJECTS;
if(((ctr->value == NULL && rs->value != NULL && rs->flags & RRDVAR_FLAG_ALLOCATED) || (rs->value == ctr->value))
&& ctr->flags == options && rs->type == ctr->type) {
// don't reset it - everything is the same, or as it should...
return false;
}
internal_error(true, "RRDSETVAR: resetting variable '%s' of chart '%s' of host '%s', options from 0x%x to 0x%x, type from %d to %d",
string2str(rs->name), rrdset_id(ctr->rrdset), rrdhost_hostname(ctr->rrdset->rrdhost),
options, ctr->flags, rs->type, ctr->type);
rrdsetvar_free_value_unsafe(rs); // we are going to change the options, so free it before setting it
rs->flags = ctr->flags;
rs->type = ctr->type;
rrdsetvar_set_value_unsafe(rs, ctr->value);
// recreate the rrdvariables while we are having a write lock to the dictionary
rrdsetvar_update_rrdvars_unsafe(ctr->rrdset, rs);
return true;
}
static void rrdsetvar_delete_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rrdsetvar, void *rrdset __maybe_unused) {
RRDSET *st = rrdset;
RRDSETVAR *rs = rrdsetvar;
rrdsetvar_free_rrdvars_unsafe(st, rs);
rrdsetvar_free_value_unsafe(rs);
string_freez(rs->name);
rs->name = NULL;
}
void rrdsetvar_index_init(RRDSET *st) {
if(!st->rrdsetvar_root_index) {
st->rrdsetvar_root_index = dictionary_create(DICT_OPTION_DONT_OVERWRITE_VALUE);
dictionary_register_insert_callback(st->rrdsetvar_root_index, rrdsetvar_insert_callback, NULL);
dictionary_register_conflict_callback(st->rrdsetvar_root_index, rrdsetvar_conflict_callback, NULL);
dictionary_register_delete_callback(st->rrdsetvar_root_index, rrdsetvar_delete_callback, st);
}
}
void rrdsetvar_index_destroy(RRDSET *st) {
dictionary_destroy(st->rrdsetvar_root_index);
st->rrdsetvar_root_index = NULL;
}
const RRDSETVAR_ACQUIRED *rrdsetvar_add_and_acquire(RRDSET *st, const char *name, RRDVAR_TYPE type, void *value, RRDVAR_FLAGS flags) {
struct rrdsetvar_constructor tmp = {
.name = name,
.type = type,
.value = value,
.flags = flags,
.rrdset = st,
};
const RRDSETVAR_ACQUIRED *rsa = (const RRDSETVAR_ACQUIRED *)dictionary_set_and_acquire_item_advanced(st->rrdsetvar_root_index, name, -1, NULL, sizeof(RRDSETVAR), &tmp);
return rsa;
}
void rrdsetvar_add_and_leave_released(RRDSET *st, const char *name, RRDVAR_TYPE type, void *value, RRDVAR_FLAGS flags) {
const RRDSETVAR_ACQUIRED *rsa = rrdsetvar_add_and_acquire(st, name, type, value, flags);
dictionary_acquired_item_release(st->rrdsetvar_root_index, (const DICTIONARY_ITEM *)rsa);
}
void rrdsetvar_rename_all(RRDSET *st) {
debug(D_VARIABLES, "RRDSETVAR rename for chart id '%s' name '%s'", rrdset_id(st), rrdset_name(st));
RRDSETVAR *rs;
dfe_start_write(st->rrdsetvar_root_index, rs) {
// should only be called while the rrdsetvar dict is write locked
rrdsetvar_update_rrdvars_unsafe(st, rs);
}
dfe_done(rs);
rrdcalc_link_matching_alerts_to_rrdset(st);
}
void rrdsetvar_release_and_delete_all(RRDSET *st) {
RRDSETVAR *rs;
dfe_start_write(st->rrdsetvar_root_index, rs) {
dictionary_del_advanced(st->rrdsetvar_root_index, string2str(rs->name), (ssize_t)string_strlen(rs->name) + 1);
}
dfe_done(rs);
}
void rrdsetvar_release(DICTIONARY *dict, const RRDSETVAR_ACQUIRED *rsa) {
dictionary_acquired_item_release(dict, (const DICTIONARY_ITEM *)rsa);
}
// --------------------------------------------------------------------------------------------------------------------
// custom chart variables
const RRDSETVAR_ACQUIRED *rrdsetvar_custom_chart_variable_add_and_acquire(RRDSET *st, const char *name) {
STRING *name_string = rrdvar_name_to_string(name);
const RRDSETVAR_ACQUIRED *rs = rrdsetvar_add_and_acquire(st, string2str(name_string), RRDVAR_TYPE_CALCULATED, NULL, RRDVAR_FLAG_CUSTOM_CHART_VAR);
string_freez(name_string);
return rs;
}
void rrdsetvar_custom_chart_variable_set(RRDSET *st, const RRDSETVAR_ACQUIRED *rsa, NETDATA_DOUBLE value) {
if(!rsa) return;
RRDSETVAR *rs = dictionary_acquired_item_value((const DICTIONARY_ITEM *)rsa);
if(rs->type != RRDVAR_TYPE_CALCULATED || !(rs->flags & RRDVAR_FLAG_CUSTOM_CHART_VAR) || !(rs->flags & RRDVAR_FLAG_ALLOCATED)) {
error("RRDSETVAR: requested to set variable '%s' of chart '%s' on host '%s' to value " NETDATA_DOUBLE_FORMAT
" but the variable is not a custom chart one (it has options 0x%x, value pointer %p). Ignoring request.", string2str(rs->name), rrdset_id(st), rrdhost_hostname(st->rrdhost), value, (uint32_t)rs->flags, rs->value);
}
else {
NETDATA_DOUBLE *v = rs->value;
if(*v != value) {
*v = value;
// mark the chart to be sent upstream
rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
}
}
}
void rrdsetvar_print_to_streaming_custom_chart_variables(RRDSET *st, BUFFER *wb) {
// send the chart local custom variables
RRDSETVAR *rs;
dfe_start_read(st->rrdsetvar_root_index, rs) {
if(unlikely(rs->type == RRDVAR_TYPE_CALCULATED && rs->flags & RRDVAR_FLAG_CUSTOM_CHART_VAR)) {
NETDATA_DOUBLE *value = (NETDATA_DOUBLE *) rs->value;
buffer_sprintf(wb
, "VARIABLE CHART %s = " NETDATA_DOUBLE_FORMAT "\n"
, string2str(rs->name)
, *value
);
}
}
dfe_done(rs);
}
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