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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_input.h>
#include <fluent-bit/flb_input_plugin.h>
#include <fluent-bit/flb_utils.h>
#include <fluent-bit/flb_network.h>
#include <fluent-bit/flb_downstream.h>
#include <fluent-bit/flb_config_map.h>
#include "mqtt.h"
#include "mqtt_conn.h"
#include "mqtt_config.h"
/* Initialize plugin */
static int in_mqtt_init(struct flb_input_instance *in,
struct flb_config *config, void *data)
{
unsigned short int port;
int ret;
struct flb_in_mqtt_config *ctx;
(void) data;
/* Allocate space for the configuration */
ctx = mqtt_config_init(in);
if (!ctx) {
return -1;
}
ctx->ins = in;
ctx->msgp_len = 0;
/* Set the context */
flb_input_set_context(in, ctx);
/* Create downstream */
port = (unsigned short int) strtoul(ctx->tcp_port, NULL, 10);
ctx->downstream = flb_downstream_create(FLB_TRANSPORT_TCP,
in->flags,
ctx->listen,
port,
in->tls,
config,
&in->net_setup);
if (ctx->downstream == NULL) {
flb_plg_error(ctx->ins,
"could not initialize downstream on %s:%s. Aborting",
ctx->listen, ctx->tcp_port);
mqtt_config_free(ctx);
return -1;
}
flb_input_downstream_set(ctx->downstream, ctx->ins);
/* Collect upon data available on the standard input */
ret = flb_input_set_collector_event(in,
in_mqtt_collect,
ctx->downstream->server_fd,
config);
if (ret == -1) {
flb_plg_error(ctx->ins, "could not set collector for MQTT input plugin");
mqtt_config_free(ctx);
return -1;
}
return 0;
}
/*
* For a server event, the collection event means a new client have arrived, we
* accept the connection and create a new MQTT instance which will wait for
* events/data (MQTT control packages)
*/
int in_mqtt_collect(struct flb_input_instance *ins,
struct flb_config *config, void *in_context)
{
struct flb_connection *connection;
struct mqtt_conn *conn;
struct flb_in_mqtt_config *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_debug(ctx->ins, "[fd=%i] new TCP connection", connection->fd);
conn = mqtt_conn_add(connection, ctx);
if (!conn) {
flb_downstream_conn_release(connection);
return -1;
}
return 0;
}
static int in_mqtt_exit(void *data, struct flb_config *config)
{
(void) *config;
struct flb_in_mqtt_config *ctx = data;
if (!ctx) {
return 0;
}
mqtt_conn_destroy_all(ctx);
mqtt_config_free(ctx);
return 0;
}
/* Configuration properties map */
static struct flb_config_map config_map[] = {
{
FLB_CONFIG_MAP_STR, "payload_key", NULL,
0, FLB_TRUE, offsetof(struct flb_in_mqtt_config, payload_key),
"Key where the payload will be preserved"
},
/* EOF */
{0}
};
/* Plugin reference */
struct flb_input_plugin in_mqtt_plugin = {
.name = "mqtt",
.description = "MQTT, listen for Publish messages",
.cb_init = in_mqtt_init,
.cb_pre_run = NULL,
.cb_collect = in_mqtt_collect,
.cb_flush_buf = NULL,
.cb_exit = in_mqtt_exit,
.config_map = config_map,
.flags = FLB_INPUT_NET_SERVER | FLB_IO_OPT_TLS
};
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