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flb_parser_ltsv.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2024 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.
*/
#define _GNU_SOURCE
#include <time.h>
#include <fluent-bit/flb_parser.h>
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_parser_decoder.h>
/*
* http://ltsv.org
*
* ltsv = *(record NL) [record]
* record = [field *(TAB field)]
* field = label ":" field-value
* label = 1*lbyte
* field-value = *fbyte
*
* TAB = %x09
* NL = [%x0D] %x0A
* lbyte = %x30-39 / %x41-5A / %x61-7A / "_" / "." / "-" ;; [0-9A-Za-z_.-]
* fbyte = %x01-08 / %x0B / %x0C / %x0E-FF
*/
static char ltvs_label[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
static char ltvs_field[256] = {
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
};
static int ltsv_parser(struct flb_parser *parser,
const char *in_buf, size_t in_size,
msgpack_packer *tmp_pck,
char *time_key, size_t time_key_len,
time_t *time_lookup, double *tmfrac,
size_t *map_size)
{
int ret;
struct flb_tm tm = {0};
const unsigned char *label = NULL;
size_t label_len = 0;
const unsigned char *field = NULL;
size_t field_len = 0;
const unsigned char *c = (const unsigned char *)in_buf;
const unsigned char *end = c + in_size;
int last_byte;
int do_pack = FLB_TRUE;
/* if map_size is 0 only count the number of k:v */
if (*map_size == 0) {
do_pack = FLB_FALSE;
}
while (c < end) {
label = c;
while ((c < end) && ltvs_label[*c]) {
c++;
}
label_len = c - label;
if (c == end) {
break;
}
if (*c != ':') {
break;
}
c++;
field = c;
if (c != end) {
while ((c < end) && ltvs_field[*c]) {
c++;
}
}
field_len = c - field;
if (label_len > 0) {
int time_found = FLB_FALSE;
if (parser->time_fmt && label_len == time_key_len &&
field_len > 0 &&
!strncmp((const char *)label, time_key, label_len)) {
if (do_pack) {
ret = flb_parser_time_lookup((const char *) field, field_len,
0, parser, &tm, tmfrac);
if (ret == -1) {
flb_error("[parser:%s] Invalid time format %s",
parser->name, parser->time_fmt_full);
return -1;
}
*time_lookup = flb_parser_tm2time(&tm);
}
time_found = FLB_TRUE;
}
if (time_found == FLB_FALSE || parser->time_keep == FLB_TRUE) {
if (do_pack) {
if (parser->types_len != 0) {
flb_parser_typecast((const char*) label, label_len,
(const char*) field, field_len,
tmp_pck,
parser->types,
parser->types_len);
}
else {
msgpack_pack_str(tmp_pck, label_len);
msgpack_pack_str_body(tmp_pck, (const char *)label, label_len);
msgpack_pack_str(tmp_pck, field_len);
msgpack_pack_str_body(tmp_pck, (const char *)field, field_len);
}
}
else {
(*map_size)++;
}
}
}
if (c == end) {
break;
}
if (*c == '\t') {
c++;
}
if (c == end) {
break;
}
if (*c == '\r') {
c++;
if (c == end) {
break;
}
if (*c == '\n') {
c++;
}
break;
}
if (*c == '\n') {
c++;
break;
}
}
last_byte = (const char *)c - in_buf;
return last_byte;
}
int flb_parser_ltsv_do(struct flb_parser *parser,
const char *in_buf, size_t in_size,
void **out_buf, size_t *out_size,
struct flb_time *out_time)
{
int ret;
time_t time_lookup;
double tmfrac = 0;
struct flb_time *t;
msgpack_sbuffer tmp_sbuf;
msgpack_packer tmp_pck;
char *dec_out_buf;
size_t dec_out_size;
size_t map_size;
char *time_key;
size_t time_key_len;
int last_byte;
if (parser->time_key) {
time_key = parser->time_key;
}
else {
time_key = "time";
}
time_key_len = strlen(time_key);
time_lookup = 0;
/* count the number of key value pairs */
map_size = 0;
ltsv_parser(parser, in_buf, in_size, NULL,
time_key, time_key_len,
&time_lookup, &tmfrac, &map_size);
if (map_size == 0) {
return -1;
}
/* Prepare new outgoing buffer */
msgpack_sbuffer_init(&tmp_sbuf);
msgpack_packer_init(&tmp_pck, &tmp_sbuf, msgpack_sbuffer_write);
msgpack_pack_map(&tmp_pck, map_size);
last_byte = ltsv_parser(parser, in_buf, in_size, &tmp_pck,
time_key, time_key_len,
&time_lookup, &tmfrac, &map_size);
if (last_byte < 0) {
msgpack_sbuffer_destroy(&tmp_sbuf);
return last_byte;
}
/* Export results */
*out_buf = tmp_sbuf.data;
*out_size = tmp_sbuf.size;
t = out_time;
t->tm.tv_sec = time_lookup;
t->tm.tv_nsec = (tmfrac * 1000000000);
/* Check if some decoder was specified */
if (parser->decoders) {
ret = flb_parser_decoder_do(parser->decoders,
tmp_sbuf.data, tmp_sbuf.size,
&dec_out_buf, &dec_out_size);
if (ret == 0) {
*out_buf = dec_out_buf;
*out_size = dec_out_size;
msgpack_sbuffer_destroy(&tmp_sbuf);
}
}
return last_byte;
}