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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_mem.h>
#include <fluent-bit/stream_processor/flb_sp.h>
#include <fluent-bit/stream_processor/flb_sp_parser.h>
#include <fluent-bit/stream_processor/flb_sp_snapshot.h>
static struct flb_sp_snapshot_page *snapshot_page_create()
{
struct flb_sp_snapshot_page *page;
page = (struct flb_sp_snapshot_page *)
flb_calloc(1, sizeof(struct flb_sp_snapshot_page));
if (!page) {
flb_errno();
return NULL;
}
page->snapshot_page = (char *) flb_malloc(SNAPSHOT_PAGE_SIZE);
if (!page->snapshot_page) {
flb_errno();
flb_free(page);
return NULL;
}
return page;
}
static int snapshot_cleanup(struct flb_sp_snapshot *snapshot, struct flb_time *tms)
{
int ok;
size_t off;
size_t off_copy;
msgpack_unpacked result;
msgpack_object *obj;
struct flb_time tms0;
struct flb_sp_snapshot_page *page;
ok = MSGPACK_UNPACK_SUCCESS;
off = 0;
while (mk_list_is_empty(&snapshot->pages) != 0) {
page = mk_list_entry_first(&snapshot->pages, struct flb_sp_snapshot_page,
_head);
off = page->start_pos;
off_copy = off;
msgpack_unpacked_init(&result);
while (msgpack_unpack_next(&result, page->snapshot_page, page->end_pos,
&off) == ok) {
if (snapshot->record_limit > 0 &&
snapshot->records > snapshot->record_limit) {
page->start_pos = off;
snapshot->records--;
snapshot->size = snapshot->size - (off - off_copy);
off_copy = off;
continue;
}
/* extract timestamp */
flb_time_pop_from_msgpack(&tms0, &result, &obj);
if (snapshot->time_limit > 0 &&
tms->tm.tv_sec - tms0.tm.tv_sec > snapshot->time_limit) {
page->start_pos = off;
snapshot->records--;
snapshot->size = snapshot->size - (off - off_copy);
off_copy = off;
continue;
}
break;
}
msgpack_unpacked_destroy(&result);
/* If page is empty, free the page and move to the next one */
if (page->start_pos != page->end_pos) {
break;
}
mk_list_del(&page->_head);
flb_free(page->snapshot_page);
flb_free(page);
}
return 0;
}
static bool snapshot_page_is_full(struct flb_sp_snapshot_page *page, size_t buf_size)
{
return SNAPSHOT_PAGE_SIZE - page->end_pos < buf_size;
}
char *flb_sp_snapshot_name_from_flush(flb_sds_t name)
{
return name + sizeof("__flush_") - 1;
}
int flb_sp_snapshot_update(struct flb_sp_task *task, const char *buf_data,
size_t buf_size, struct flb_time *tms)
{
int ok;
size_t off = 0;
struct flb_time tm;
struct flb_sp_snapshot *snapshot;
struct flb_sp_snapshot_page *page;
msgpack_unpacked result;
msgpack_object *obj;
ok = MSGPACK_UNPACK_SUCCESS;
msgpack_unpacked_init(&result);
if (buf_size <= 0) {
return -1;
}
snapshot = (struct flb_sp_snapshot *) task->snapshot;
/* Create a snapshot pgae if the list is empty */
if (mk_list_is_empty(&snapshot->pages) == 0) {
page = snapshot_page_create();
if (!page) {
flb_errno();
return -1;
}
mk_list_add(&page->_head, &snapshot->pages);
}
else {
page = mk_list_entry_last(&snapshot->pages, struct flb_sp_snapshot_page, _head);
if (snapshot_page_is_full(page, buf_size)) {
page = snapshot_page_create();
if (!page) {
flb_errno();
return -1;
}
mk_list_add(&page->_head, &snapshot->pages);
}
}
memcpy(page->snapshot_page + page->end_pos, buf_data, buf_size);
page->end_pos = page->end_pos + buf_size;
/* Get the last timestamp */
while (msgpack_unpack_next(&result, page->snapshot_page,
page->end_pos - page->start_pos, &off) == ok) {
flb_time_pop_from_msgpack(&tm, &result, &obj);
}
msgpack_unpacked_destroy(&result);
snapshot->records++;
snapshot->size = snapshot->size + buf_size;
/* Remove records from snapshot pages based on time/length window */
snapshot_cleanup(snapshot, tms);
return 0;
}
int flb_sp_snapshot_flush(struct flb_sp *sp, struct flb_sp_task *task,
char **out_buf_data, size_t *out_buf_size)
{
size_t off;
size_t page_size;
char *snapshot_name;
char *out_buf_data_tmp;
struct flb_sp_cmd *cmd;
struct mk_list *tmp;
struct mk_list *head;
struct mk_list *snapshot_head;
struct flb_sp_task *snapshot_task;
struct flb_sp_snapshot *snapshot;
struct flb_sp_snapshot_page *page;
off = 0;
cmd = task->cmd;
snapshot_name = flb_sp_snapshot_name_from_flush(cmd->stream_name);
/* Lookup Tasks that matches the incoming instance data */
mk_list_foreach(head, &sp->tasks) {
snapshot_task = mk_list_entry(head, struct flb_sp_task, _head);
cmd = snapshot_task->cmd;
if (cmd->type == FLB_SP_CREATE_SNAPSHOT &&
flb_sds_cmp(cmd->stream_name, snapshot_name,
strlen(snapshot_name)) == 0) {
snapshot = (struct flb_sp_snapshot *) snapshot_task->snapshot;
if (snapshot->size == 0) {
break;
}
if (*out_buf_data == NULL) {
*out_buf_data = (char *) flb_malloc(snapshot->size);
if (!*out_buf_data) {
flb_errno();
return -1;
}
*out_buf_size = snapshot->size;
}
else {
out_buf_data_tmp = (char *) flb_realloc(*out_buf_data,
*out_buf_size + snapshot->size);
if (!out_buf_data_tmp) {
flb_errno();
return -1;
}
*out_buf_data = out_buf_data_tmp;
*out_buf_size = *out_buf_size + snapshot->size;
}
mk_list_foreach_safe(snapshot_head, tmp, &snapshot->pages) {
page = mk_list_entry_first(&snapshot->pages,
struct flb_sp_snapshot_page, _head);
page_size = page->end_pos - page->start_pos;
memcpy(*out_buf_data + off,
page->snapshot_page + page->start_pos, page_size);
off = off + page_size;
/* Remove page from list */
mk_list_del(&page->_head);
flb_free(page->snapshot_page);
flb_free(page);
}
mk_list_init(&snapshot->pages);
snapshot->records = 0;
snapshot->size = 0;
}
}
return 0;
}
void flb_sp_snapshot_destroy(struct flb_sp_snapshot *snapshot)
{
struct mk_list *head;
struct mk_list *tmp;
struct flb_sp_snapshot_page *page;
if (snapshot != NULL) {
mk_list_foreach_safe(head, tmp, &snapshot->pages) {
page = mk_list_entry(head, struct flb_sp_snapshot_page, _head);
mk_list_del(&page->_head);
flb_free(page->snapshot_page);
flb_free(page);
}
flb_free(snapshot);
}
}
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