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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_hash_table.h>
#include <fluent-bit/flb_input_plugin.h>
#include "ne.h"
#include "ne_utils.h"
#define VMSTAT_ENTRIES "^(oom_kill|pgpg|pswp|pg.*fault).*"
static int keep_field(struct flb_ne *ctx, flb_sds_t field)
{
return flb_regex_match(ctx->vml_regex_fields,
(unsigned char *) field, flb_sds_len(field));
}
static int vmstat_configure(struct flb_ne *ctx)
{
int ret;
int parts;
char tmp[256];
struct mk_list *head;
struct mk_list list;
struct mk_list split_list;
struct flb_slist_entry *line;
struct flb_slist_entry *key;
struct cmt_counter *c;
/* Initialize regex for skipped devices */
ctx->vml_regex_fields = flb_regex_create(VMSTAT_ENTRIES);
if (!ctx->vml_regex_fields) {
flb_plg_error(ctx->ins,
"could not initialize regex pattern for matching "
"fields: '%s'",
VMSTAT_ENTRIES);
return -1;
}
/* Initialize hash table */
ctx->vml_ht = flb_hash_table_create(FLB_HASH_TABLE_EVICT_NONE, 16, 0);
if (!ctx->vml_ht) {
return -1;
}
mk_list_init(&list);
mk_list_init(&split_list);
ret = ne_utils_file_read_lines(ctx->path_procfs, "/vmstat", &list);
if (ret == -1) {
return -1;
}
mk_list_foreach(head, &list) {
line = mk_list_entry(head, struct flb_slist_entry, _head);
mk_list_init(&split_list);
ret = flb_slist_split_string(&split_list, line->str, ' ', 2);
if (ret == -1) {
continue;
}
parts = ret;
parts = ret;
if (parts < 2) {
flb_slist_destroy(&split_list);
continue;
}
/* retrieve key and value */
key = flb_slist_entry_get(&split_list, 0);
/* keep field ? */
if (!keep_field(ctx, key->str)) {
flb_slist_destroy(&split_list);
continue;
}
snprintf(tmp, sizeof(tmp) - 1,
"/proc/vmstat information field %s.", key->str);
c = cmt_counter_create(ctx->cmt, "node", "vmstat", key->str,
tmp, 0, NULL);
if (!c) {
flb_slist_destroy(&split_list);
flb_slist_destroy(&list);
return -1;
}
ret = flb_hash_table_add(ctx->vml_ht,
key->str, flb_sds_len(key->str), c, 0);
if (ret == -1) {
flb_plg_error(ctx->ins,
"could not add hash for vmstat metric: %s", key->str);
flb_slist_destroy(&split_list);
flb_slist_destroy(&list);
return -1;
}
flb_slist_destroy(&split_list);
}
flb_slist_destroy(&list);
return 0;
}
static int vmstat_update(struct flb_ne *ctx)
{
int ret;
int parts;
double v;
uint64_t ts;
size_t out_size = 0;
struct mk_list *head;
struct mk_list list;
struct mk_list split_list;
struct flb_slist_entry *line;
struct flb_slist_entry *key;
struct flb_slist_entry *val;
struct cmt_untyped *u;
mk_list_init(&list);
mk_list_init(&split_list);
ret = ne_utils_file_read_lines(ctx->path_procfs, "/vmstat", &list);
if (ret == -1) {
return -1;
}
ts = cfl_time_now();
mk_list_foreach(head, &list) {
line = mk_list_entry(head, struct flb_slist_entry, _head);
mk_list_init(&split_list);
ret = flb_slist_split_string(&split_list, line->str, ' ', 2);
if (ret == -1) {
continue;
}
parts = ret;
if (parts == 0) {
flb_slist_destroy(&split_list);
continue;
}
/* retrieve key and value */
key = flb_slist_entry_get(&split_list, 0);
val = flb_slist_entry_get(&split_list, 1);
/* keep field ? */
if (!keep_field(ctx, key->str)) {
flb_slist_destroy(&split_list);
continue;
}
ret = flb_hash_table_get(ctx->vml_ht,
key->str, flb_sds_len(key->str),
(void *) &u, &out_size);
if (ret == -1) {
flb_plg_error(ctx->ins,
"could not retrieve vmstat hash metric: '%s'", key->str);
flb_slist_destroy(&split_list);
continue;
}
/* set metric */
ne_utils_str_to_double(val->str, &v);
cmt_untyped_set(u, ts, v, 0, NULL);
flb_slist_destroy(&split_list);
}
flb_slist_destroy(&list);
return 0;
}
int ne_vmstat_init(struct flb_ne *ctx)
{
vmstat_configure(ctx);
return 0;
}
int ne_vmstat_update(struct flb_ne *ctx)
{
vmstat_update(ctx);
return 0;
}
int ne_vmstat_exit(struct flb_ne *ctx)
{
if (ctx->vml_regex_fields) {
flb_regex_destroy(ctx->vml_regex_fields);
}
if (ctx->vml_ht) {
flb_hash_table_destroy(ctx->vml_ht);
}
return 0;
}
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