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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_sds.h>
#include <fluent-bit/flb_input_plugin.h>
#include <fluent-bit/flb_file.h>
#include "ne.h"
#include "ne_utils.h"
#include <unistd.h>
#include <float.h>
#include <sys/types.h>
#include <sys/stat.h>
/* Prometheus decoder */
#include <cmetrics/cmt_decode_prometheus.h>
#include "cmt_decode_prometheus_parser.h"
static char *error_reason(int cmt_error)
{
static char *reason = NULL;
switch(cmt_error) {
case CMT_DECODE_PROMETHEUS_SYNTAX_ERROR:
reason = "syntax error";
break;
case CMT_DECODE_PROMETHEUS_ALLOCATION_ERROR:
reason = "allocation error";
break;
case CMT_DECODE_PROMETHEUS_MAX_LABEL_COUNT_EXCEEDED:
reason = "max label count exceeded";
break;
case CMT_DECODE_PROMETHEUS_CMT_SET_ERROR:
reason = "cmt set error";
break;
case CMT_DECODE_PROMETHEUS_CMT_CREATE_ERROR:
reason = "cmt create error";
break;
case CMT_DECODE_PROMETHEUS_PARSE_VALUE_FAILED:
reason = "parse value failed";
break;
case CMT_DECODE_PROMETHEUS_PARSE_TIMESTAMP_FAILED:
reason = "parse timestamp failed";
break;
default:
reason = "unknown reason";
}
return reason;
}
static int textfile_update(struct flb_ne *ctx)
{
int ret;
char errbuf[256];
flb_sds_t contents;
struct cmt_decode_prometheus_parse_opts opts;
uint64_t timestamp;
struct cmt *cmt;
struct mk_list *head;
struct mk_list list;
struct flb_slist_entry *entry;
const char *nop_pattern = "";
const char *dir_pattern = "/*.prom";
char *ext;
struct stat st;
int use_directory_pattern = FLB_FALSE;
timestamp = cfl_time_now();
memset(&opts, 0, sizeof(opts));
opts.errbuf = errbuf;
opts.errbuf_size = sizeof(errbuf);
opts.default_timestamp = timestamp;
flb_plg_debug(ctx->ins, "scanning path %s", ctx->path_textfile);
if (ctx->path_textfile == NULL) {
flb_plg_warn(ctx->ins, "No valid path for textfile metric is registered");
return -1;
}
ext = strrchr(ctx->path_textfile, '.');
if (ext != NULL) {
if (strncmp(ext, ".prom", 5) == 0) {
flb_plg_debug(ctx->ins, "specified path %s has \".prom\" extension",
ctx->path_textfile);
use_directory_pattern = FLB_FALSE;
}
else {
ret = stat(ctx->path_textfile, &st);
if (ret != 0) {
flb_plg_warn(ctx->ins, "specified path %s is not accesible",
ctx->path_textfile);
}
if (S_ISREG(st.st_mode)) {
flb_plg_warn(ctx->ins, "specified path %s does not have \".prom\" extension. Assuming directory",
ctx->path_textfile);
use_directory_pattern = FLB_TRUE;
}
}
}
else {
flb_plg_debug(ctx->ins, "specified file path %s does not have extension part. Globbing directory with \"%s\" suffix",
ctx->path_textfile, dir_pattern);
use_directory_pattern = FLB_TRUE;
}
if (use_directory_pattern == FLB_TRUE) {
/* Scan the given directory path */
ret = ne_utils_path_scan(ctx, ctx->path_textfile, dir_pattern, NE_SCAN_FILE, &list);
if (ret != 0) {
return -1;
}
}
else {
/* Scan the given file path */
ret = ne_utils_path_scan(ctx, ctx->path_textfile, nop_pattern, NE_SCAN_FILE, &list);
if (ret != 0) {
return -1;
}
}
/* Process entries */
mk_list_foreach(head, &list) {
entry = mk_list_entry(head, struct flb_slist_entry, _head);
/* Update metrics from text file */
contents = flb_file_read(entry->str);
if (contents == NULL) {
flb_plg_debug(ctx->ins, "skip invalid file of prometheus: %s",
entry->str);
continue;
}
if (flb_sds_len(contents) == 0) {
flb_plg_debug(ctx->ins, "skip empty payload of prometheus: %s",
entry->str);
continue;
}
ret = cmt_decode_prometheus_create(&cmt, contents, flb_sds_len(contents), &opts);
if (ret == 0) {
flb_plg_debug(ctx->ins, "parse a payload of prometheus: %s",
entry->str);
cmt_cat(ctx->cmt, cmt);
cmt_decode_prometheus_destroy(cmt);
}
else {
flb_plg_debug(ctx->ins, "parse a payload of prometheus: dismissed: %s, error: %d",
entry->str, ret);
cmt_counter_set(ctx->load_errors, timestamp, 1.0, 1, (char*[]){error_reason(ret)});
}
flb_sds_destroy(contents);
}
flb_slist_destroy(&list);
return 0;
}
int ne_textfile_init(struct flb_ne *ctx)
{
ctx->load_errors = cmt_counter_create(ctx->cmt,
"node",
"textfile",
"node_textfile_scrape_error",
"Greater equal than 1 if there was an error opening, reading, or parsing a file, 0 otherwise.",
1, (char *[]) {"reason"});
if (ctx->load_errors == NULL) {
return -1;
}
return 0;
}
int ne_textfile_update(struct flb_ne *ctx)
{
textfile_update(ctx);
return 0;
}
int ne_textfile_exit(struct flb_ne *ctx)
{
return 0;
}
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