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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.
*/
#define _DEFAULT_SOURCE
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_input_plugin.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "tail_file.h"
#include "tail_db.h"
#include "tail_config.h"
#include "tail_signal.h"
#ifdef FLB_SYSTEM_WINDOWS
#include "win32.h"
#endif
struct fs_stat {
/* last time check */
time_t checked;
/* previous status */
struct stat st;
};
static int tail_fs_event(struct flb_input_instance *ins,
struct flb_config *config, void *in_context)
{
int ret;
struct mk_list *head;
struct mk_list *tmp;
struct flb_tail_config *ctx = in_context;
struct flb_tail_file *file = NULL;
struct fs_stat *fst;
struct stat st;
time_t t;
t = time(NULL);
/* Lookup watched file */
mk_list_foreach_safe(head, tmp, &ctx->files_event) {
file = mk_list_entry(head, struct flb_tail_file, _head);
fst = file->fs_backend;
/* Check current status of the file */
ret = fstat(file->fd, &st);
if (ret == -1) {
flb_errno();
continue;
}
/* Check if the file was modified */
if ((fst->st.st_mtime != st.st_mtime) ||
(fst->st.st_size != st.st_size)) {
/* Update stat info and trigger the notification */
memcpy(&fst->st, &st, sizeof(struct stat));
fst->checked = t;
in_tail_collect_event(file, config);
}
}
return 0;
}
static int tail_fs_check(struct flb_input_instance *ins,
struct flb_config *config, void *in_context)
{
int ret;
int64_t offset;
char *name;
struct mk_list *tmp;
struct mk_list *head;
struct flb_tail_config *ctx = in_context;
struct flb_tail_file *file = NULL;
struct fs_stat *fst;
struct stat st;
/* Lookup watched file */
mk_list_foreach_safe(head, tmp, &ctx->files_event) {
file = mk_list_entry(head, struct flb_tail_file, _head);
fst = file->fs_backend;
ret = fstat(file->fd, &st);
if (ret == -1) {
flb_plg_debug(ctx->ins, "error stat(2) %s, removing", file->name);
flb_tail_file_remove(file);
continue;
}
/* Check if the file have been deleted */
if (st.st_nlink == 0) {
flb_plg_debug(ctx->ins, "file has been deleted: %s", file->name);
#ifdef FLB_HAVE_SQLDB
if (ctx->db) {
/* Remove file entry from the database */
flb_tail_db_file_delete(file, ctx);
}
#endif
flb_tail_file_remove(file);
continue;
}
/* Check if the file was truncated */
if (file->offset > st.st_size) {
offset = lseek(file->fd, 0, SEEK_SET);
if (offset == -1) {
flb_errno();
return -1;
}
flb_plg_debug(ctx->ins, "file truncated %s", file->name);
file->offset = offset;
file->buf_len = 0;
memcpy(&fst->st, &st, sizeof(struct stat));
#ifdef FLB_HAVE_SQLDB
/* Update offset in database file */
if (ctx->db) {
flb_tail_db_file_offset(file, ctx);
}
#endif
}
if (file->offset < st.st_size) {
file->pending_bytes = (st.st_size - file->offset);
tail_signal_pending(ctx);
}
else {
file->pending_bytes = 0;
}
/* Discover the current file name for the open file descriptor */
name = flb_tail_file_name(file);
if (!name) {
flb_plg_debug(ctx->ins, "could not resolve %s, removing", file->name);
flb_tail_file_remove(file);
continue;
}
/*
* Check if file still exists. This method requires explicity that the
* user is using an absolute path, otherwise we will be rotating the
* wrong file.
*
* flb_tail_target_file_name_cmp is a deeper compare than
* flb_tail_file_name_cmp. If applicable, it compares to the underlying
* real_name of the file.
*/
if (flb_tail_file_is_rotated(ctx, file) == FLB_TRUE) {
flb_tail_file_rotated(file);
}
flb_free(name);
}
return 0;
}
/* File System events based on stat(2) */
int flb_tail_fs_stat_init(struct flb_input_instance *in,
struct flb_tail_config *ctx, struct flb_config *config)
{
int ret;
flb_plg_debug(ctx->ins, "flb_tail_fs_stat_init() initializing stat tail input");
/* Set a manual timer to collect events every 0.250 seconds */
ret = flb_input_set_collector_time(in, tail_fs_event,
0, 250000000, config);
if (ret < 0) {
return -1;
}
ctx->coll_fd_fs1 = ret;
/* Set a manual timer to check deleted/rotated files every 2.5 seconds */
ret = flb_input_set_collector_time(in, tail_fs_check,
2, 500000000, config);
if (ret < 0) {
return -1;
}
ctx->coll_fd_fs2 = ret;
return 0;
}
void flb_tail_fs_stat_pause(struct flb_tail_config *ctx)
{
flb_input_collector_pause(ctx->coll_fd_fs1, ctx->ins);
flb_input_collector_pause(ctx->coll_fd_fs2, ctx->ins);
}
void flb_tail_fs_stat_resume(struct flb_tail_config *ctx)
{
flb_input_collector_resume(ctx->coll_fd_fs1, ctx->ins);
flb_input_collector_resume(ctx->coll_fd_fs2, ctx->ins);
}
int flb_tail_fs_stat_add(struct flb_tail_file *file)
{
int ret;
struct fs_stat *fst;
fst = flb_malloc(sizeof(struct fs_stat));
if (!fst) {
flb_errno();
return -1;
}
fst->checked = time(NULL);
ret = stat(file->name, &fst->st);
if (ret == -1) {
flb_errno();
flb_free(fst);
return -1;
}
file->fs_backend = fst;
return 0;
}
int flb_tail_fs_stat_remove(struct flb_tail_file *file)
{
if (file->tail_mode == FLB_TAIL_EVENT) {
flb_free(file->fs_backend);
}
return 0;
}
int flb_tail_fs_stat_exit(struct flb_tail_config *ctx)
{
(void) ctx;
return 0;
}
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