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flb_metrics_exporter.c
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flb_metrics_exporter.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2018 Treasure Data Inc.
*
* 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
*
* https://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.
*/
/*
* Metrics exporter go around each Fluent Bit subsystem and collect metrics
* in a fixed interval of time. This operation is atomic and happens as one
* event handled by the main event loop.
*/
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_utils.h>
#include <fluent-bit/flb_config.h>
#include <fluent-bit/flb_input.h>
#include <fluent-bit/flb_output.h>
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_http_server.h>
#include <fluent-bit/flb_metrics.h>
#include <fluent-bit/flb_metrics_exporter.h>
static int collect_inputs(msgpack_sbuffer *mp_sbuf, msgpack_packer *mp_pck,
struct flb_config *ctx)
{
int total = 0;
size_t s;
char *buf;
struct mk_list *head;
struct flb_input_instance *i;
msgpack_pack_str(mp_pck, 5);
msgpack_pack_str_body(mp_pck, "input", 5);
mk_list_foreach(head, &ctx->inputs) {
i = mk_list_entry(head, struct flb_input_instance, _head);
if (!i->metrics) {
continue;
}
total++; /* FIXME: keep total number in cache */
}
msgpack_pack_map(mp_pck, total);
mk_list_foreach(head, &ctx->inputs) {
i = mk_list_entry(head, struct flb_input_instance, _head);
if (!i->metrics) {
continue;
}
flb_metrics_dump_values(&buf, &s, i->metrics);
msgpack_pack_str(mp_pck, i->metrics->title_len);
msgpack_pack_str_body(mp_pck, i->metrics->title, i->metrics->title_len);
msgpack_sbuffer_write(mp_sbuf, buf, s);
flb_free(buf);
}
return 0;
}
static int collect_outputs(msgpack_sbuffer *mp_sbuf, msgpack_packer *mp_pck,
struct flb_config *ctx)
{
int total = 0;
size_t s;
char *buf;
struct mk_list *head;
struct flb_output_instance *i;
msgpack_pack_str(mp_pck, 6);
msgpack_pack_str_body(mp_pck, "output", 6);
mk_list_foreach(head, &ctx->outputs) {
i = mk_list_entry(head, struct flb_output_instance, _head);
if (!i->metrics) {
continue;
}
total++; /* FIXME: keep total number in cache */
}
msgpack_pack_map(mp_pck, total);
mk_list_foreach(head, &ctx->outputs) {
i = mk_list_entry(head, struct flb_output_instance, _head);
if (!i->metrics) {
continue;
}
flb_metrics_dump_values(&buf, &s, i->metrics);
msgpack_pack_str(mp_pck, i->metrics->title_len);
msgpack_pack_str_body(mp_pck, i->metrics->title, i->metrics->title_len);
msgpack_sbuffer_write(mp_sbuf, buf, s);
flb_free(buf);
}
return 0;
}
static int collect_metrics(struct flb_me *me)
{
int keys;
struct flb_config *ctx = me->config;
msgpack_sbuffer mp_sbuf;
msgpack_packer mp_pck;
/* Prepare new outgoing buffer */
msgpack_sbuffer_init(&mp_sbuf);
msgpack_packer_init(&mp_pck, &mp_sbuf, msgpack_sbuffer_write);
keys = 2; /* input, output */
msgpack_pack_map(&mp_pck, keys);
/* Collect metrics from input instances */
collect_inputs(&mp_sbuf, &mp_pck, me->config);
collect_outputs(&mp_sbuf, &mp_pck, me->config);
#ifdef FLB_HAVE_HTTP_SERVER
if (ctx->http_server == FLB_TRUE) {
flb_hs_push_metrics(ctx->http_ctx, mp_sbuf.data, mp_sbuf.size);
}
#endif
msgpack_sbuffer_destroy(&mp_sbuf);
return 0;
}
/* Create metrics exporter context */
struct flb_me *flb_me_create(struct flb_config *ctx)
{
int fd;
struct mk_event *event;
struct flb_me *me;
/* Context */
me = flb_malloc(sizeof(struct flb_me));
if (!me) {
flb_errno();
return NULL;
}
me->config = ctx;
/* Initialize event loop context */
event = &me->event;
MK_EVENT_NEW(event);
/* Run every one second */
fd = mk_event_timeout_create(ctx->evl, 1, 0, &me->event);
if (fd == -1) {
flb_error("[metrics_exporter] registration failed");
flb_free(me);
return NULL;
}
me->fd = fd;
return me;
}
/* Handle the event loop notification: "it's time to collect metrics" */
int flb_me_fd_event(int fd, struct flb_me *me)
{
if (fd != me->fd) {
return -1;
}
flb_utils_timer_consume(fd);
collect_metrics(me);
return 0;
}
int flb_me_destroy(struct flb_me *me)
{
mk_event_timeout_destroy(me->config->evl, &me->event);
flb_free(me);
return 0;
}