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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_log_event_encoder.h>
#include <fluent-bit/flb_log_event_encoder_dynamic_field.h>
struct flb_log_event_encoder_dynamic_field_scope *
flb_log_event_encoder_dynamic_field_scope_current(
struct flb_log_event_encoder_dynamic_field *field)
{
if (cfl_list_is_empty(&field->scopes)) {
return NULL;
}
return cfl_list_entry_first(
&field->scopes,
struct flb_log_event_encoder_dynamic_field_scope,
_head);
}
int flb_log_event_encoder_dynamic_field_scope_enter(
struct flb_log_event_encoder_dynamic_field *field,
int type)
{
int result;
struct flb_log_event_encoder_dynamic_field_scope *scope;
if (type != MSGPACK_OBJECT_MAP &&
type != MSGPACK_OBJECT_ARRAY) {
return FLB_EVENT_ENCODER_ERROR_INVALID_ARGUMENT;
}
result = flb_log_event_encoder_dynamic_field_append(field);
if (result != FLB_EVENT_ENCODER_SUCCESS) {
return result;
}
scope = flb_calloc(1,
sizeof(struct flb_log_event_encoder_dynamic_field_scope));
if (scope == NULL) {
return FLB_EVENT_ENCODER_ERROR_ALLOCATION_ERROR;
}
cfl_list_entry_init(&scope->_head);
scope->type = type;
scope->offset = field->buffer.size;
cfl_list_prepend(&scope->_head, &field->scopes);
if (type == MSGPACK_OBJECT_MAP) {
flb_mp_map_header_init(&scope->header, &field->packer);
}
else if (type == MSGPACK_OBJECT_ARRAY) {
flb_mp_array_header_init(&scope->header, &field->packer);
}
return FLB_EVENT_ENCODER_SUCCESS;
}
int flb_log_event_encoder_dynamic_field_scope_leave(
struct flb_log_event_encoder_dynamic_field *field,
struct flb_log_event_encoder_dynamic_field_scope *scope,
int commit)
{
if (scope == NULL) {
return FLB_EVENT_ENCODER_ERROR_INVALID_ARGUMENT;
}
if (commit) {
/* We increment the entry count on each append because
* we don't discriminate based on the scope type so
* we need to divide the entry count by two for maps
* to ensure the entry count matches the kv pair count
*/
if (scope->type == MSGPACK_OBJECT_MAP) {
scope->header.entries /= 2;
flb_mp_map_header_end(&scope->header);
}
else {
flb_mp_array_header_end(&scope->header);
}
}
else {
field->buffer.size = scope->offset;
}
cfl_list_del(&scope->_head);
flb_free(scope);
return FLB_EVENT_ENCODER_SUCCESS;
}
int flb_log_event_encoder_dynamic_field_begin_map(
struct flb_log_event_encoder_dynamic_field *field)
{
return flb_log_event_encoder_dynamic_field_scope_enter(field,
MSGPACK_OBJECT_MAP);
}
int flb_log_event_encoder_dynamic_field_begin_array(
struct flb_log_event_encoder_dynamic_field *field)
{
return flb_log_event_encoder_dynamic_field_scope_enter(field,
MSGPACK_OBJECT_ARRAY);
}
int flb_log_event_encoder_dynamic_field_commit_map(
struct flb_log_event_encoder_dynamic_field *field)
{
struct flb_log_event_encoder_dynamic_field_scope *scope;
scope = flb_log_event_encoder_dynamic_field_scope_current(field);
return flb_log_event_encoder_dynamic_field_scope_leave(field,
scope,
FLB_TRUE);
}
int flb_log_event_encoder_dynamic_field_commit_array(
struct flb_log_event_encoder_dynamic_field *field)
{
struct flb_log_event_encoder_dynamic_field_scope *scope;
scope = flb_log_event_encoder_dynamic_field_scope_current(field);
return flb_log_event_encoder_dynamic_field_scope_leave(field,
scope,
FLB_TRUE);
}
int flb_log_event_encoder_dynamic_field_rollback_map(
struct flb_log_event_encoder_dynamic_field *field)
{
struct flb_log_event_encoder_dynamic_field_scope *scope;
scope = flb_log_event_encoder_dynamic_field_scope_current(field);
return flb_log_event_encoder_dynamic_field_scope_leave(field,
scope,
FLB_FALSE);
}
int flb_log_event_encoder_dynamic_field_rollback_array(
struct flb_log_event_encoder_dynamic_field *field)
{
struct flb_log_event_encoder_dynamic_field_scope *scope;
scope = flb_log_event_encoder_dynamic_field_scope_current(field);
return flb_log_event_encoder_dynamic_field_scope_leave(field,
scope,
FLB_TRUE);
}
int flb_log_event_encoder_dynamic_field_append(
struct flb_log_event_encoder_dynamic_field *field)
{
struct flb_log_event_encoder_dynamic_field_scope *scope;
scope = flb_log_event_encoder_dynamic_field_scope_current(field);
if (scope == NULL) {
if (cfl_list_is_empty(&field->scopes)) {
return FLB_EVENT_ENCODER_SUCCESS;
}
return FLB_EVENT_ENCODER_ERROR_INVALID_ARGUMENT;
}
flb_mp_map_header_append(&scope->header);
return FLB_EVENT_ENCODER_SUCCESS;
}
static int flb_log_event_encoder_dynamic_field_flush_scopes(
struct flb_log_event_encoder_dynamic_field *field,
int commit)
{
int result;
struct flb_log_event_encoder_dynamic_field_scope *scope;
result = FLB_EVENT_ENCODER_SUCCESS;
do {
scope = flb_log_event_encoder_dynamic_field_scope_current(field);
if (scope != NULL) {
result = flb_log_event_encoder_dynamic_field_scope_leave(field,
scope,
commit);
}
} while (scope != NULL &&
result == FLB_EVENT_ENCODER_SUCCESS);
return result;
}
int flb_log_event_encoder_dynamic_field_flush(
struct flb_log_event_encoder_dynamic_field *field)
{
int result;
result = flb_log_event_encoder_dynamic_field_flush_scopes(field, FLB_TRUE);
if (result == FLB_EVENT_ENCODER_SUCCESS) {
field->data = field->buffer.data;
field->size = field->buffer.size;
}
return result;
}
int flb_log_event_encoder_dynamic_field_reset(
struct flb_log_event_encoder_dynamic_field *field)
{
msgpack_sbuffer_clear(&field->buffer);
flb_log_event_encoder_dynamic_field_flush_scopes(field, FLB_FALSE);
field->data = NULL;
field->size = 0;
return FLB_EVENT_ENCODER_SUCCESS;
}
int flb_log_event_encoder_dynamic_field_init(
struct flb_log_event_encoder_dynamic_field *field,
int type)
{
msgpack_sbuffer_init(&field->buffer);
msgpack_packer_init(&field->packer,
&field->buffer,
msgpack_sbuffer_write);
field->initialized = FLB_TRUE;
field->type = type;
cfl_list_init(&field->scopes);
flb_log_event_encoder_dynamic_field_reset(field);
return FLB_EVENT_ENCODER_SUCCESS;
}
void flb_log_event_encoder_dynamic_field_destroy(
struct flb_log_event_encoder_dynamic_field *field)
{
msgpack_sbuffer_destroy(&field->buffer);
field->initialized = FLB_FALSE;
}
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