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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2023 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_input_plugin.h>
#include <fluent-bit/flb_network.h>
#include <fluent-bit/flb_config.h>
#include <fluent-bit/flb_random.h>
#include "in_elasticsearch.h"
#include "in_elasticsearch_config.h"
#include "in_elasticsearch_bulk_conn.h"
/*
* For a server event, the collection event means a new client have arrived, we
* accept the connection and create a new TCP instance which will wait for
* JSON map messages.
*/
static int in_elasticsearch_bulk_collect(struct flb_input_instance *ins,
struct flb_config *config, void *in_context)
{
struct flb_connection *connection;
struct in_elasticsearch_bulk_conn *conn;
struct flb_in_elasticsearch *ctx;
ctx = in_context;
connection = flb_downstream_conn_get(ctx->downstream);
if (connection == NULL) {
flb_plg_error(ctx->ins, "could not accept new connection");
return -1;
}
flb_plg_trace(ctx->ins, "new TCP connection arrived FD=%i",
connection->fd);
conn = in_elasticsearch_bulk_conn_add(connection, ctx);
if (conn == NULL) {
flb_downstream_conn_release(connection);
return -1;
}
return 0;
}
static void bytes_to_groupname(unsigned char *data, char *buf, size_t len) {
int index;
char charset[] = "0123456789"
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
while (len-- > 0) {
index = (int) data[len];
index = index % (sizeof(charset) - 1);
buf[len] = charset[index];
}
}
static void bytes_to_nodename(unsigned char *data, char *buf, size_t len) {
int index;
char charset[] = "0123456789"
"abcdefghijklmnopqrstuvwxyz";
while (len-- > 0) {
index = (int) data[len];
index = index % (sizeof(charset) - 1);
buf[len] = charset[index];
}
}
static int in_elasticsearch_bulk_init(struct flb_input_instance *ins,
struct flb_config *config, void *data)
{
unsigned short int port;
int ret;
struct flb_in_elasticsearch *ctx;
unsigned char rand[16];
(void) data;
/* Create context and basic conf */
ctx = in_elasticsearch_config_create(ins);
if (!ctx) {
return -1;
}
ctx->collector_id = -1;
/* Populate context with config map defaults and incoming properties */
ret = flb_input_config_map_set(ins, (void *) ctx);
if (ret == -1) {
flb_plg_error(ctx->ins, "configuration error");
in_elasticsearch_config_destroy(ctx);
return -1;
}
/* Set the context */
flb_input_set_context(ins, ctx);
port = (unsigned short int) strtoul(ctx->tcp_port, NULL, 10);
if (flb_random_bytes(rand, 16)) {
flb_plg_error(ctx->ins, "cannot generate cluster name");
in_elasticsearch_config_destroy(ctx);
return -1;
}
bytes_to_groupname(rand, ctx->cluster_name, 16);
if (flb_random_bytes(rand, 12)) {
flb_plg_error(ctx->ins, "cannot generate node name");
in_elasticsearch_config_destroy(ctx);
return -1;
}
bytes_to_nodename(rand, ctx->node_name, 12);
ctx->downstream = flb_downstream_create(FLB_TRANSPORT_TCP,
ins->flags,
ctx->listen,
port,
ins->tls,
config,
&ins->net_setup);
if (ctx->downstream == NULL) {
flb_plg_error(ctx->ins,
"could not initialize downstream on %s:%s. Aborting",
ctx->listen, ctx->tcp_port);
in_elasticsearch_config_destroy(ctx);
return -1;
}
flb_input_downstream_set(ctx->downstream, ctx->ins);
/* Collect upon data available on the standard input */
ret = flb_input_set_collector_socket(ins,
in_elasticsearch_bulk_collect,
ctx->downstream->server_fd,
config);
if (ret == -1) {
flb_plg_error(ctx->ins, "Could not set collector for IN_ELASTICSEARCH input plugin");
in_elasticsearch_config_destroy(ctx);
return -1;
}
ctx->collector_id = ret;
return 0;
}
static int in_elasticsearch_bulk_exit(void *data, struct flb_config *config)
{
struct flb_in_elasticsearch *ctx;
(void) config;
ctx = data;
if (ctx != NULL) {
in_elasticsearch_config_destroy(ctx);
}
return 0;
}
/* Configuration properties map */
static struct flb_config_map config_map[] = {
{
FLB_CONFIG_MAP_SIZE, "buffer_max_size", HTTP_BUFFER_MAX_SIZE,
0, FLB_TRUE, offsetof(struct flb_in_elasticsearch, buffer_max_size),
"Set the maximum size of buffer"
},
{
FLB_CONFIG_MAP_SIZE, "buffer_chunk_size", HTTP_BUFFER_CHUNK_SIZE,
0, FLB_TRUE, offsetof(struct flb_in_elasticsearch, buffer_chunk_size),
"Set the buffer chunk size"
},
{
FLB_CONFIG_MAP_STR, "tag_key", NULL,
0, FLB_TRUE, offsetof(struct flb_in_elasticsearch, tag_key),
"Specify a key name for extracting as a tag"
},
{
FLB_CONFIG_MAP_STR, "meta_key", "@meta",
0, FLB_TRUE, offsetof(struct flb_in_elasticsearch, meta_key),
"Specify a key name for meta information"
},
{
FLB_CONFIG_MAP_STR, "hostname", "localhost",
0, FLB_TRUE, offsetof(struct flb_in_elasticsearch, hostname),
"Specify hostname or FQDN. This parameter is effective for sniffering node information."
},
{
FLB_CONFIG_MAP_STR, "version", "8.0.0",
0, FLB_TRUE, offsetof(struct flb_in_elasticsearch, es_version),
"Specify returning Elasticsearch server version."
},
/* EOF */
{0}
};
/* Plugin reference */
struct flb_input_plugin in_elasticsearch_plugin = {
.name = "elasticsearch",
.description = "HTTP Endpoints for Elasticsearch (Bulk API)",
.cb_init = in_elasticsearch_bulk_init,
.cb_pre_run = NULL,
.cb_collect = in_elasticsearch_bulk_collect,
.cb_flush_buf = NULL,
.cb_pause = NULL,
.cb_resume = NULL,
.cb_exit = in_elasticsearch_bulk_exit,
.config_map = config_map,
.flags = FLB_INPUT_NET_SERVER | FLB_IO_OPT_TLS
};
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