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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_pack.h>
#include <fluent-bit/flb_sds.h>
#include "storage.h"
#include <fluent-bit/flb_http_server.h>
#include <msgpack.h>
pthread_key_t hs_storage_metrics_key;
/* Return the newest storage metrics buffer */
static struct flb_hs_buf *storage_metrics_get_latest()
{
struct flb_hs_buf *buf;
struct mk_list *metrics_list;
metrics_list = pthread_getspecific(hs_storage_metrics_key);
if (!metrics_list) {
return NULL;
}
if (mk_list_size(metrics_list) == 0) {
return NULL;
}
buf = mk_list_entry_last(metrics_list, struct flb_hs_buf, _head);
return buf;
}
/* Delete unused metrics, note that we only care about the latest node */
static int cleanup_metrics()
{
int c = 0;
struct mk_list *tmp;
struct mk_list *head;
struct mk_list *metrics_list;
struct flb_hs_buf *last;
struct flb_hs_buf *entry;
metrics_list = pthread_getspecific(hs_storage_metrics_key);
if (!metrics_list) {
return -1;
}
last = storage_metrics_get_latest();
if (!last) {
return -1;
}
mk_list_foreach_safe(head, tmp, metrics_list) {
entry = mk_list_entry(head, struct flb_hs_buf, _head);
if (entry != last && entry->users == 0) {
mk_list_del(&entry->_head);
flb_sds_destroy(entry->data);
flb_free(entry->raw_data);
flb_free(entry);
c++;
}
}
return c;
}
/*
* Callback invoked every time some storage metrics are received through a
* message queue channel. This function runs in a Monkey HTTP thread
* worker and it purpose is to take the metrics data and store it
* somewhere so then it can be available by the end-points upon
* HTTP client requests.
*/
static void cb_mq_storage_metrics(mk_mq_t *queue, void *data, size_t size)
{
flb_sds_t out_data;
struct flb_hs_buf *buf;
struct mk_list *metrics_list = NULL;
metrics_list = pthread_getspecific(hs_storage_metrics_key);
if (!metrics_list) {
metrics_list = flb_malloc(sizeof(struct mk_list));
if (!metrics_list) {
flb_errno();
return;
}
mk_list_init(metrics_list);
pthread_setspecific(hs_storage_metrics_key, metrics_list);
}
/* Convert msgpack to JSON */
out_data = flb_msgpack_raw_to_json_sds(data, size);
if (!out_data) {
return;
}
buf = flb_malloc(sizeof(struct flb_hs_buf));
if (!buf) {
flb_errno();
flb_sds_destroy(out_data);
return;
}
buf->users = 0;
buf->data = out_data;
buf->raw_data = flb_malloc(size);
memcpy(buf->raw_data, data, size);
buf->raw_size = size;
mk_list_add(&buf->_head, metrics_list);
cleanup_metrics();
}
/* FIXME: pending implementation of metrics exit interface
static void cb_mq_storage_metrics_exit(mk_mq_t *queue, void *data)
{
}
*/
/* API: expose built-in storage metrics /api/v1/storage */
static void cb_storage(mk_request_t *request, void *data)
{
struct flb_hs_buf *buf;
buf = storage_metrics_get_latest();
if (!buf) {
mk_http_status(request, 404);
mk_http_done(request);
return;
}
buf->users++;
mk_http_status(request, 200);
flb_hs_add_content_type_to_req(request, FLB_HS_CONTENT_TYPE_JSON);
mk_http_send(request, buf->data, flb_sds_len(buf->data), NULL);
mk_http_done(request);
buf->users--;
}
static void hs_storage_metrics_key_destroy(void *data)
{
struct mk_list *metrics_list = (struct mk_list*)data;
struct mk_list *tmp;
struct mk_list *head;
struct flb_hs_buf *entry;
if (metrics_list == NULL) {
return;
}
mk_list_foreach_safe(head, tmp, metrics_list) {
entry = mk_list_entry(head, struct flb_hs_buf, _head);
if (entry != NULL) {
if (entry->raw_data != NULL) {
flb_free(entry->raw_data);
entry->raw_data = NULL;
}
if (entry->data) {
flb_sds_destroy(entry->data);
entry->data = NULL;
}
mk_list_del(&entry->_head);
flb_free(entry);
}
}
flb_free(metrics_list);
}
/* Perform registration */
int api_v1_storage_metrics(struct flb_hs *hs)
{
pthread_key_create(&hs_storage_metrics_key, hs_storage_metrics_key_destroy);
/* Create a message queue */
hs->qid_storage = mk_mq_create(hs->ctx, "/storage",
cb_mq_storage_metrics,
NULL);
/* HTTP end-point */
mk_vhost_handler(hs->ctx, hs->vid, "/api/v1/storage", cb_storage, hs);
return 0;
}
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