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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 <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_input.h>
#include <fluent-bit/flb_input_plugin.h>
#include <fluent-bit/flb_config.h>
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_error.h>
#include <fluent-bit/flb_log_event_decoder.h>
#include "in_lib.h"
static int in_lib_collect(struct flb_input_instance *ins,
struct flb_config *config, void *in_context)
{
int ret;
int dec_ret;
int enc_ret;
int bytes;
int out_size;
int capacity;
int size;
char *ptr;
char *pack;
struct flb_log_event record;
struct flb_log_event_decoder decoder;
struct flb_in_lib_config *ctx = in_context;
capacity = (ctx->buf_size - ctx->buf_len);
/* Allocate memory as required (FIXME: this will be limited in later) */
if (capacity == 0) {
size = ctx->buf_size + LIB_BUF_CHUNK;
ptr = flb_realloc(ctx->buf_data, size);
if (!ptr) {
flb_errno();
return -1;
}
ctx->buf_data = ptr;
ctx->buf_size = size;
capacity = LIB_BUF_CHUNK;
}
bytes = flb_pipe_r(ctx->fd,
ctx->buf_data + ctx->buf_len,
capacity);
flb_plg_trace(ctx->ins, "in_lib read() = %i", bytes);
if (bytes == -1) {
perror("read");
if (errno == -EPIPE) {
return -1;
}
return 0;
}
ctx->buf_len += bytes;
/* initially we should support json input */
ret = flb_pack_json_state(ctx->buf_data, ctx->buf_len,
&pack, &out_size, &ctx->state);
if (ret == FLB_ERR_JSON_PART) {
flb_plg_warn(ctx->ins, "lib data incomplete, waiting for more data...");
return 0;
}
else if (ret == FLB_ERR_JSON_INVAL) {
flb_plg_warn(ctx->ins, "lib data invalid");
flb_pack_state_reset(&ctx->state);
flb_pack_state_init(&ctx->state);
return -1;
}
ctx->buf_len = 0;
dec_ret = flb_log_event_decoder_init(&decoder, pack, out_size);
if (dec_ret != FLB_EVENT_DECODER_SUCCESS) {
flb_plg_error(ctx->ins,
"Log event decoder initialization error : %s",
flb_log_event_decoder_get_error_description(dec_ret));
flb_free(pack);
flb_pack_state_reset(&ctx->state);
flb_pack_state_init(&ctx->state);
return -1;
}
while ((dec_ret = flb_log_event_decoder_next(
&decoder,
&record)) == FLB_EVENT_DECODER_SUCCESS) {
enc_ret = flb_log_event_encoder_begin_record(&ctx->log_encoder);
if (enc_ret != FLB_EVENT_ENCODER_SUCCESS) {
flb_plg_error(ctx->ins,
"flb_log_event_encoder_begin_record error : %s",
flb_log_event_encoder_get_error_description(enc_ret));
flb_log_event_encoder_rollback_record(&ctx->log_encoder);
continue;
}
enc_ret = flb_log_event_encoder_set_timestamp(
&ctx->log_encoder,
&record.timestamp);
if (enc_ret != FLB_EVENT_ENCODER_SUCCESS) {
flb_plg_error(ctx->ins,
"flb_log_event_encoder_set_timestamp error : %s",
flb_log_event_encoder_get_error_description(enc_ret));
flb_log_event_encoder_rollback_record(&ctx->log_encoder);
continue;
}
enc_ret = flb_log_event_encoder_set_metadata_from_msgpack_object(
&ctx->log_encoder,
record.metadata);
if (enc_ret != FLB_EVENT_ENCODER_SUCCESS) {
flb_plg_error(ctx->ins,
"flb_log_event_encoder_set_metadata_from_msgpack_object error : %s",
flb_log_event_encoder_get_error_description(enc_ret));
flb_log_event_encoder_rollback_record(&ctx->log_encoder);
continue;
}
enc_ret = flb_log_event_encoder_set_body_from_msgpack_object(
&ctx->log_encoder,
record.body);
if (enc_ret != FLB_EVENT_ENCODER_SUCCESS) {
flb_plg_error(ctx->ins,
"flb_log_event_encoder_set_body_from_msgpack_object error : %s",
flb_log_event_encoder_get_error_description(enc_ret));
flb_log_event_encoder_rollback_record(&ctx->log_encoder);
continue;
}
enc_ret = flb_log_event_encoder_commit_record(&ctx->log_encoder);
if (enc_ret != FLB_EVENT_ENCODER_SUCCESS) {
flb_plg_error(ctx->ins,
"flb_log_event_encoder_commit_record error : %s",
flb_log_event_encoder_get_error_description(enc_ret));
flb_log_event_encoder_rollback_record(&ctx->log_encoder);
continue;
}
}
dec_ret = flb_log_event_decoder_get_last_result(&decoder);
if (dec_ret == FLB_EVENT_DECODER_SUCCESS) {
flb_input_log_append(ctx->ins, NULL, 0,
ctx->log_encoder.output_buffer,
ctx->log_encoder.output_length);
ret = 0;
}
else {
flb_plg_error(ctx->ins,
"flb_log_event_decoder_get_last_result error : %s",
flb_log_event_decoder_get_error_description(dec_ret));
ret = -1;
}
flb_log_event_encoder_reset(&ctx->log_encoder);
flb_log_event_decoder_destroy(&decoder);
/* Reset the state */
flb_free(pack);
flb_pack_state_reset(&ctx->state);
flb_pack_state_init(&ctx->state);
return ret;
}
/* Initialize plugin */
static int in_lib_init(struct flb_input_instance *in,
struct flb_config *config, void *data)
{
int ret;
struct flb_in_lib_config *ctx;
(void) data;
/* Allocate space for the configuration */
ctx = flb_malloc(sizeof(struct flb_in_lib_config));
if (!ctx) {
return -1;
}
ctx->ins = in;
/* Buffer for incoming data */
ctx->buf_size = LIB_BUF_CHUNK;
ctx->buf_data = flb_calloc(1, LIB_BUF_CHUNK);
ctx->buf_len = 0;
if (!ctx->buf_data) {
flb_errno();
flb_plg_error(ctx->ins, "Could not allocate initial buf memory buffer");
flb_free(ctx);
return -1;
}
/* Init communication channel */
flb_input_channel_init(in);
ctx->fd = in->channel[0];
/* Set the context */
flb_input_set_context(in, ctx);
/* Collect upon data available on the standard input */
ret = flb_input_set_collector_event(in,
in_lib_collect,
ctx->fd,
config);
if (ret == -1) {
flb_plg_error(ctx->ins, "Could not set collector for LIB input plugin");
flb_free(ctx->buf_data);
flb_free(ctx);
return -1;
}
ret = flb_log_event_encoder_init(&ctx->log_encoder,
FLB_LOG_EVENT_FORMAT_DEFAULT);
if (ret != FLB_EVENT_ENCODER_SUCCESS) {
flb_plg_error(ctx->ins, "error initializing event encoder : %d", ret);
flb_free(ctx->buf_data);
flb_free(ctx);
return -1;
}
flb_pack_state_init(&ctx->state);
return 0;
}
static int in_lib_exit(void *data, struct flb_config *config)
{
struct flb_in_lib_config *ctx = data;
struct flb_pack_state *s;
(void) config;
flb_log_event_encoder_destroy(&ctx->log_encoder);
if (ctx->buf_data) {
flb_free(ctx->buf_data);
}
s = &ctx->state;
flb_pack_state_reset(s);
flb_free(ctx);
return 0;
}
/* Plugin reference */
struct flb_input_plugin in_lib_plugin = {
.name = "lib",
.description = "Library mode Input",
.cb_init = in_lib_init,
.cb_pre_run = NULL,
.cb_collect = NULL,
.cb_ingest = NULL,
.cb_flush_buf = NULL,
.cb_exit = in_lib_exit
};
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