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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_input_plugin.h>
#include <fluent-bit/flb_config.h>
#include <fluent-bit/flb_metrics.h>
#include <fluent-bit/flb_metrics_exporter.h>
struct flb_in_metrics {
/* config map options */
int scrape_on_start;
int scrape_interval;
/* internal */
int coll_fd_start;
int coll_fd_runtime;
struct cmt_counter *c;
struct flb_input_instance *ins;
};
static int scrape_metrics(struct flb_config *config, struct flb_in_metrics *ctx)
{
int ret;
size_t ts;
char *name;
struct cmt *cmt;
/* Update internal metric */
ts = cfl_time_now();
name = (char *) flb_input_name(ctx->ins);
cmt_counter_inc(ctx->c, ts, 1, (char *[]) {name});
cmt = flb_me_get_cmetrics(config);
if (!cmt) {
flb_plg_error(ctx->ins, "could not scrape metrics");
return 0;
}
/* Append the updated metrics */
ret = flb_input_metrics_append(ctx->ins, NULL, 0, cmt);
if (ret != 0) {
flb_plg_error(ctx->ins, "could not append metrics");
}
cmt_destroy(cmt);
return 0;
}
/*
* Update the metrics, this function is invoked every time 'scrape_interval'
* expires.
*/
static int cb_metrics_collect_runtime(struct flb_input_instance *ins,
struct flb_config *config, void *in_context)
{
return scrape_metrics(config, in_context);
}
static int cb_metrics_collect_start(struct flb_input_instance *ins,
struct flb_config *config, void *in_context)
{
struct flb_in_metrics *ctx = in_context;
/* pause collector */
flb_input_collector_pause(ctx->coll_fd_start, ctx->ins);
return scrape_metrics(config, ctx);
}
static int in_metrics_init(struct flb_input_instance *in,
struct flb_config *config, void *data)
{
int ret;
struct flb_in_metrics *ctx;
/* Create plugin context */
ctx = flb_calloc(1, sizeof(struct flb_in_metrics));
if (!ctx) {
flb_errno();
return -1;
}
ctx->ins = in;
/* Load the config map */
ret = flb_input_config_map_set(in, (void *) ctx);
if (ret == -1) {
flb_free(ctx);
return -1;
}
/* Associate context with the instance */
flb_input_set_context(in, ctx);
/* Scrape metrics on start / collector */
if (ctx->scrape_interval > 2 && ctx->scrape_on_start) {
ret = flb_input_set_collector_time(in,
cb_metrics_collect_start,
5, 0,
config);
if (ret == -1) {
flb_plg_error(ctx->ins,
"could not set collector on start for Fluent Bit "
"metrics plugin");
return -1;
}
ctx->coll_fd_start = ret;
}
/* Create the runtime collector */
ret = flb_input_set_collector_time(in,
cb_metrics_collect_runtime,
ctx->scrape_interval, 0,
config);
if (ret == -1) {
flb_plg_error(ctx->ins,
"could not set collector for Fluent Bit metrics plugin");
return -1;
}
ctx->coll_fd_runtime = ret;
/* Internal metrics */
ctx->c = cmt_counter_create(ctx->ins->cmt,
"fluentbit", "input_metrics", "scrapes_total",
"Number of total metrics scrapes",
1, (char *[]) {"name"});
return 0;
}
static int in_metrics_exit(void *data, struct flb_config *config)
{
struct flb_in_metrics *ctx = data;
if (!ctx) {
return 0;
}
flb_free(ctx);
return 0;
}
static void in_metrics_pause(void *data, struct flb_config *config)
{
struct flb_in_metrics *ctx = data;
flb_input_collector_pause(ctx->coll_fd_runtime, ctx->ins);
}
static void in_metrics_resume(void *data, struct flb_config *config)
{
struct flb_in_metrics *ctx = data;
flb_input_collector_resume(ctx->coll_fd_runtime, ctx->ins);
}
/* Configuration properties map */
static struct flb_config_map config_map[] = {
{
FLB_CONFIG_MAP_TIME, "scrape_interval", "2",
0, FLB_TRUE, offsetof(struct flb_in_metrics, scrape_interval),
"scrape interval to collect the internal metrics of Fluent Bit."
},
{
FLB_CONFIG_MAP_BOOL, "scrape_on_start", "false",
0, FLB_TRUE, offsetof(struct flb_in_metrics, scrape_on_start),
"scrape metrics upon start, useful to avoid waiting for 'scrape_interval' "
"for the first round of metrics."
},
/* EOF */
{0}
};
struct flb_input_plugin in_fluentbit_metrics_plugin = {
.name = "fluentbit_metrics",
.description = "Fluent Bit internal metrics",
.cb_init = in_metrics_init,
.cb_pre_run = NULL,
.cb_flush_buf = NULL,
.config_map = config_map,
.cb_pause = in_metrics_pause,
.cb_resume = in_metrics_resume,
.cb_exit = in_metrics_exit,
};
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