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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 <stdio.h>
#include <fluent-bit/flb_output_plugin.h>
#include <fluent-bit/flb_utils.h>
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_time.h>
#include <fluent-bit/flb_lib.h>
#include <msgpack.h>
#include "out_lib.h"
#define PLUGIN_NAME "out_lib"
static int configure(struct flb_out_lib_config *ctx,
struct flb_output_instance *ins)
{
const char *tmp;
tmp = flb_output_get_property("format", ins);
if (!tmp) {
ctx->format = FLB_OUT_LIB_FMT_MSGPACK;
}
else {
if (strcasecmp(tmp, FLB_FMT_STR_MSGPACK) == 0) {
ctx->format = FLB_OUT_LIB_FMT_MSGPACK;
}
else if (strcasecmp(tmp, FLB_FMT_STR_JSON) == 0) {
ctx->format = FLB_OUT_LIB_FMT_JSON;
}
}
tmp = flb_output_get_property("max_records", ins);
if (tmp) {
ctx->max_records = atoi(tmp);
}
else {
ctx->max_records = 0;
}
return 0;
}
/**
* User callback is passed from flb_output(ctx, output, callback)
*
* The prototype of callback should be
* int (*callback)(void* data, size_t size );
* @param data The data which comes from input plugin.
* @param size The size of data.
* @return success ? 0 : negative value
*
*/
static int out_lib_init(struct flb_output_instance *ins,
struct flb_config *config,
void *data)
{
struct flb_out_lib_config *ctx = NULL;
struct flb_lib_out_cb *cb_data = data;
(void) config;
ctx = flb_calloc(1, sizeof(struct flb_out_lib_config));
if (ctx == NULL) {
flb_errno();
return -1;
}
ctx->ins = ins;
if (cb_data) {
/* Set user callback and data */
ctx->cb_func = cb_data->cb;
ctx->cb_data = cb_data->data;
}
else {
flb_plg_error(ctx->ins, "Callback is not set");
flb_free(ctx);
return -1;
}
configure(ctx, ins);
flb_output_set_context(ins, ctx);
return 0;
}
static void out_lib_flush(struct flb_event_chunk *event_chunk,
struct flb_output_flush *out_flush,
struct flb_input_instance *i_ins,
void *out_context,
struct flb_config *config)
{
int len;
int count = 0;
size_t off = 0;
size_t last_off = 0;
size_t data_size = 0;
size_t alloc_size = 0;
size_t out_size = 0;
char *buf = NULL;
char *out_buf = NULL;
char *data_for_user = NULL;
msgpack_object *obj;
msgpack_unpacked result;
struct flb_time tm;
struct flb_out_lib_config *ctx = out_context;
(void) i_ins;
(void) config;
msgpack_unpacked_init(&result);
while (msgpack_unpack_next(&result,
event_chunk->data,
event_chunk->size, &off) == MSGPACK_UNPACK_SUCCESS) {
if (ctx->max_records > 0 && count >= ctx->max_records) {
break;
}
switch(ctx->format) {
case FLB_OUT_LIB_FMT_MSGPACK:
alloc_size = (off - last_off);
/* copy raw bytes */
data_for_user = flb_malloc(alloc_size);
if (!data_for_user) {
flb_errno();
msgpack_unpacked_destroy(&result);
FLB_OUTPUT_RETURN(FLB_ERROR);
}
memcpy(data_for_user,
(char *) event_chunk->data + last_off, alloc_size);
data_size = alloc_size;
break;
case FLB_OUT_LIB_FMT_JSON:
#ifdef FLB_HAVE_METRICS
if (event_chunk->type == FLB_EVENT_TYPE_METRICS) {
alloc_size = (off - last_off) + 4096;
buf = flb_msgpack_to_json_str(alloc_size, &result.data);
if (buf == NULL) {
msgpack_unpacked_destroy(&result);
FLB_OUTPUT_RETURN(FLB_ERROR);
}
data_size = strlen(buf);
data_for_user = buf;
}
else {
#endif
/* JSON is larger than msgpack */
alloc_size = (off - last_off) + 128;
flb_time_pop_from_msgpack(&tm, &result, &obj);
buf = flb_msgpack_to_json_str(alloc_size, obj);
if (!buf) {
msgpack_unpacked_destroy(&result);
FLB_OUTPUT_RETURN(FLB_ERROR);
}
len = strlen(buf);
out_size = len + 32;
out_buf = flb_malloc(out_size);
if (!out_buf) {
flb_errno();
msgpack_unpacked_destroy(&result);
FLB_OUTPUT_RETURN(FLB_ERROR);
}
len = snprintf(out_buf, out_size, "[%f,%s]",
flb_time_to_double(&tm),
buf);
flb_free(buf);
data_for_user = out_buf;
data_size = len;
#ifdef FLB_HAVE_METRICS
}
#endif
break;
}
/* Invoke user callback */
ctx->cb_func(data_for_user, data_size, ctx->cb_data);
last_off = off;
count++;
}
msgpack_unpacked_destroy(&result);
FLB_OUTPUT_RETURN(FLB_OK);
}
static int out_lib_exit(void *data, struct flb_config *config)
{
struct flb_out_lib_config *ctx = data;
flb_free(ctx);
return 0;
}
struct flb_output_plugin out_lib_plugin = {
.name = "lib",
.description = "Library mode Output",
.cb_init = out_lib_init,
.cb_flush = out_lib_flush,
.cb_exit = out_lib_exit,
.event_type = FLB_OUTPUT_LOGS | FLB_OUTPUT_METRICS,
.flags = 0,
};
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