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https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-16 00:00:02 +01:00
mqtt: initial implementation of MQTT node-type
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3 changed files with 641 additions and 0 deletions
99
include/villas/nodes/mqtt.h
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99
include/villas/nodes/mqtt.h
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@ -0,0 +1,99 @@
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/** Node type: mqtt
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*
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* This file implements the file type for nodes.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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/**
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* @addtogroup mqtt mqtt node type
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* @ingroup node
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* @{
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*/
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#pragma once
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#include "node.h"
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#include "pool.h"
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#include "queue_signalled.h"
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/* Forward declarations */
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struct io_format;
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struct mosquitto;
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struct mqtt {
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struct mosquitto *client;
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struct queue_signalled queue;
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struct pool pool;
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int keepalive; /**< Keep-alive interval in seconds. Zero for no keepalive. */
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int port; /**< Hostname / IP address of the broker. */
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int qos; /**< Integer value 0, 1 or 2 indicating the Quality of Service to be used for publishing messages. */
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int retain; /**< Mark published messages as retained. */
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char *host; /**< Hostname / IP address of the broker. */
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char *username; /**< Username for authentication to the broker. */
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char *password; /**< Password for authentication to the broker. */
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char *publish; /**< Publish topic. */
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char *subscribe; /**< Subscribe topic. */
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struct {
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int enabled; /**< Enable SSL encrypted connection to broker. */
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int insecure; /**< Allow insecure SSL connections. */
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char *cafile; /**< SSL CA file. */
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char *capath; /**< SSL CA path. */
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char *certfile; /**< SSL certificate. */
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char *keyfile; /**< SSL private key. */
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} ssl;
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struct io_format *format;
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};
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/** @see node_type::reverse */
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char * mqtt_reverse(struct node *n);
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/** @see node_type::print */
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char * mqtt_print(struct node *n);
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/** @see node_type::parse */
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int mqtt_parse(struct node *n, json_t *cfg);
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/** @see node_type::open */
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int mqtt_start(struct node *n);
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/** @see node_type::destroy */
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int mqtt_destroy(struct node *n);
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/** @see node_type::close */
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int mqtt_stop(struct node *n);
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/** @see node_type::init */
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int mqtt_init();
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/** @see node_type::deinit */
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int mqtt_deinit();
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/** @see node_type::read */
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int mqtt_read(struct node *n, struct sample *smps[], unsigned cnt);
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/** @see node_type::write */
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int mqtt_write(struct node *n, struct sample *smps[], unsigned cnt);
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/** @} */
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@ -39,6 +39,7 @@ WITH_STATS ?= 1
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WITH_INFLUXDB ?= 1
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WITH_AMQP ?= 1
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WITH_IEC61850 ?= 1
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WITH_MQTT ?= 1
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# Enabled loopback node-type
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ifeq ($(WITH_LOOPBACK),1)
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@ -182,3 +183,12 @@ ifeq ($(shell $(PKGCONFIG) librabbitmq; echo $$?),0)
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LIB_CFLAGS += -DWITH_AMQP
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endif
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endif
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# Enable MQTT support
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ifeq ($(WITH_MQTT),1)
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ifneq ($(wildcard /usr/include/mosquitto.h),)
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LIB_SRCS += lib/nodes/mqtt.c
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LIB_CFLAGS += -DWITH_MQTT
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LIB_LDLIBS += -lmosquitto
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endif
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endif
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532
lib/nodes/mqtt.c
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532
lib/nodes/mqtt.c
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@ -0,0 +1,532 @@
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/** Node type: mqtt
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <string.h>
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#include <mosquitto.h>
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#include "nodes/mqtt.h"
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#include "plugin.h"
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#include "utils.h"
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#include "io_format.h"
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#ifdef MQTT_THREAD
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#include <pthread.h>
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static struct {
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pthread_mutex_t mutex;
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int length;
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struct pollfd *fds;
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struct mosquitto **clients;
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} polling = {
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.length = 0,
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.fds = NULL,
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.clients = NULL
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};
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static pthread_t thread;
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static int mqtt_register_client(struct mosquitto *mosq)
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{
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// pthread_mutex_lock(&polling.mutex);
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/* Add this client to the pollfd list */
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int i = polling.length++;
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polling.fds = realloc(polling.fds, polling.length * sizeof(struct pollfd));
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polling.clients = realloc(polling.clients, polling.length * sizeof(struct mosquitto *));
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if (!polling.fds || !polling.clients) {
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// pthread_mutex_unlock(&polling.mutex);
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return -1;
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}
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polling.clients[i] = mosq;
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polling.fds[i].events = POLLIN;
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polling.fds[i].fd = mosquitto_socket(mosq);
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// pthread_mutex_unlock(&polling.mutex);
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return 0;
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}
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static int mqtt_unregister_client(struct mosquitto *mosq)
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{
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// pthread_mutex_lock(&polling.mutex);
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/* Find client */
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int i;
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for (i = 0; i < polling.length; i++) {
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if (polling.clients[i] == mosq)
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break;
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}
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if (i >= polling.length) {
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// pthread_mutex_unlock(&polling.mutex);
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return -1; /* Otherwise something wrong happened! */
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}
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/* Remove this client to the pollfd list */
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memmove(polling.fds + i, polling.fds + i + 1, (polling.length - i - 1) * sizeof(struct pollfd));
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memmove(polling.clients + i, polling.clients + i + 1, (polling.length - i - 1) * sizeof(struct mosquitto *));
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polling.length--;
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// pthread_mutex_unlock(&polling.mutex);
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return 0;
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}
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static void * mqtt_thread(void *ctx)
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{
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int ret;
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debug(1, "MQTT: started thread");
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while (1) {
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// pthread_mutex_lock(&polling.mutex);
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debug(1, "MQTT: Polling on %d clients", polling.length);
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ret = poll(polling.fds, polling.length, -1);
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if (ret < 0)
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serror("Failed to poll");
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for (int i = 0; i < polling.length; i++) {
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if (polling.fds[i].revents & POLLIN) {
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ret = mosquitto_loop(polling.clients[i], -1, 1);
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if (ret)
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warn("MQTT: Loop failed for clients %p!", polling.clients[i]);
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}
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}
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// pthread_mutex_unlock(&polling.mutex);
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}
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return NULL;
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}
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#endif
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static void mqtt_log_cb(struct mosquitto *mosq, void *userdata, int level, const char *str)
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{
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switch (level) {
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case MOSQ_LOG_NONE:
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case MOSQ_LOG_INFO:
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case MOSQ_LOG_NOTICE:
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info("MQTT: %s", str);
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break;
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case MOSQ_LOG_WARNING:
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warn("MQTT: %s", str);
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break;
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case MOSQ_LOG_ERR:
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error("MQTT: %s", str);
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break;
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case MOSQ_LOG_DEBUG:
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debug(5, "MQTT: %s", str);
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break;
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}
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}
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static void mqtt_connect_cb(struct mosquitto *mosq, void *userdata, int result)
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{
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struct node *n = (struct node *) userdata;
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struct mqtt *m = (struct mqtt *) n->_vd;
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debug(1, "MQTT: Node %s connected to broker %s", node_name(n), m->host);
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// mqtt_register_client(mosq);
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}
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static void mqtt_disconnect_cb(struct mosquitto *mosq, void *userdata, int result)
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{
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struct node *n = (struct node *) userdata;
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struct mqtt *m = (struct mqtt *) n->_vd;
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debug(1, "MQTT: Node %s disconnected from broker %s", node_name(n), m->host);
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// mqtt_unregister_client(mosq)
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}
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static void mqtt_message_cb(struct mosquitto *mosq, void *userdata, const struct mosquitto_message *msg)
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{
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int ret;
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struct node *n = (struct node *) userdata;
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struct mqtt *m = (struct mqtt *) n->_vd;
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struct sample *smp;
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debug(1, "MQTT: Node %s received a message of %d bytes from broker %s", node_name(n), msg->payloadlen, m->host);
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smp = sample_alloc(&m->pool);
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if (!smp) {
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warn("Pool underrun in subscriber of %s", node_name(n));
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return;
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}
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ret = io_format_sscan(m->format, msg->payload, msg->payloadlen, NULL, &smp, 1, 0);
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if (ret != 1)
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return;
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queue_signalled_push(&m->queue, (void *) smp);
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}
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static void mqtt_subscribe_cb(struct mosquitto *mosq, void *userdata, int mid, int qos_count, const int *granted_qos)
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{
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struct node *n = (struct node *) userdata;
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struct mqtt *m = (struct mqtt *) n->_vd;
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info("MQTT node %s subscribed to broker %s", node_name(n), m->host);
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}
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int mqtt_reverse(struct node *n)
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{
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struct mqtt *m = (struct mqtt *) n->_vd;
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SWAP(m->publish, m->subscribe);
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return 0;
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}
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int mqtt_parse(struct node *n, json_t *cfg)
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{
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int ret;
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struct mqtt *m = (struct mqtt *) n->_vd;
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const char *host;
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const char *format = "villas-human";
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const char *publish = NULL;
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const char *subscribe = NULL;
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const char *username = NULL;
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const char *password = NULL;
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/* Default values */
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m->port = 1883;
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m->qos = 0;
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m->retain = 0;
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m->keepalive = 1; // 1 second
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m->ssl.enabled = 0;
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m->ssl.insecure = 0;
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json_error_t err;
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json_t *json_ssl = NULL;
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ret = json_unpack_ex(cfg, &err, 0, "{ s?: s, s?: s, s?: s, s: s, s?: i, s?: i, s?: i, s?: b, s?: s, s?: s, s?: o }",
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"publish", &publish,
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"subscribe", &subscribe,
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"format", &format,
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"host", &host,
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"port", &m->port,
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"qos", &m->qos,
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"keepalive", &m->keepalive,
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"retain", &m->retain,
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"username", &username,
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"password", &password,
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"ssl", &json_ssl
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);
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if (ret)
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jerror(&err, "Failed to parse configuration of node %s", node_name(n));
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m->host = strdup(host);
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m->publish = publish ? strdup(publish) : NULL;
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m->subscribe = subscribe ? strdup(subscribe) : NULL;
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m->username = username ? strdup(username) : NULL;
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m->password = password ? strdup(password) : NULL;
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if (json_ssl) {
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const char *cafile = NULL;
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const char *capath = NULL;
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const char *certfile = NULL;
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const char *keyfile = NULL;
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ret = json_unpack_ex(cfg, &err, 0, "{ s?: b, s?: b, s?: s, s?: s, s?: s, s?: s }",
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"enabled", &m->ssl.enabled,
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"insecure", &m->ssl.insecure,
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"cafile", &cafile,
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"capath", &capath,
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"certfile", &certfile,
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"keyfile", &keyfile
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);
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if (ret)
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jerror(&err, "Failed to parse SSL configuration of node %s", node_name(n));
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if (m->ssl.enabled && !cafile && !capath)
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error("Either 'ssl.cafile' or 'ssl.capath' settings must be set for node %s.", node_name(n));
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m->ssl.cafile = cafile ? strdup(cafile) : NULL;
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m->ssl.capath = capath ? strdup(capath) : NULL;
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m->ssl.certfile = certfile ? strdup(certfile) : NULL;
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m->ssl.keyfile = keyfile ? strdup(keyfile) : NULL;
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}
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m->format = io_format_lookup(format);
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if (!m->format)
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error("Invalid format '%s' for node %s", format, node_name(n));
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return 0;
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}
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char * mqtt_print(struct node *n)
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{
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struct mqtt *m = (struct mqtt *) n->_vd;
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char *buf = NULL;
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strcatf(&buf, "format=%s, host=%s, port=%d, username=%s, keepalive=%s, ssl=%s", plugin_name(m->format),
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m->host,
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m->port,
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m->username,
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m->keepalive ? "yes" : "no",
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m->ssl.enabled ? "yes" : "no"
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);
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if (m->publish)
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strcatf(&buf, ", publish=%s", m->publish);
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if (m->subscribe)
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strcatf(&buf, ", subscribe=%s", m->subscribe);
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return buf;
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}
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int mqtt_destroy(struct node *n)
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{
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int ret;
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struct mqtt *m = (struct mqtt *) n->_vd;
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mosquitto_destroy(m->client);
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ret = pool_destroy(&m->pool);
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if (ret)
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return ret;
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ret = queue_signalled_destroy(&m->queue);
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if (ret)
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return ret;
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if (m->publish)
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free(m->publish);
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if (m->subscribe)
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free(m->subscribe);
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if (m->password)
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free(m->password);
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if (m->username)
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free(m->username);
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free(m->host);
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return 0;
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}
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int mqtt_start(struct node *n)
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{
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int ret;
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struct mqtt *m = (struct mqtt *) n->_vd;
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m->client = mosquitto_new(n->name, 0, (void *) n);
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if (!m->client)
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return -1;
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#ifdef MQTT_THREAD
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ret = mosquitto_threaded_set(m->client, 1);
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if (ret)
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return ret;
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#endif
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if (m->username && m->password) {
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ret = mosquitto_username_pw_set(m->client, m->username, m->password);
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if (ret)
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return ret;
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}
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if (m->ssl.enabled) {
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ret = mosquitto_tls_set(m->client, m->ssl.cafile, m->ssl.capath, m->ssl.certfile, m->ssl.keyfile, NULL);
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if (ret)
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return ret;
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|
||||
ret = mosquitto_tls_insecure_set(m->client, m->ssl.insecure);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
mosquitto_log_callback_set(m->client, mqtt_log_cb);
|
||||
mosquitto_connect_callback_set(m->client, mqtt_connect_cb);
|
||||
mosquitto_disconnect_callback_set(m->client, mqtt_disconnect_cb);
|
||||
mosquitto_message_callback_set(m->client, mqtt_message_cb);
|
||||
mosquitto_subscribe_callback_set(m->client, mqtt_subscribe_cb);
|
||||
|
||||
ret = pool_init(&m->pool, 1024, SAMPLE_LEN(n->samplelen), &memtype_hugepage);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = queue_signalled_init(&m->queue, 1024, &memtype_hugepage, 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = mosquitto_connect(m->client, m->host, m->port, m->keepalive);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
#ifdef MQTT_THREAD
|
||||
mqtt_register_client(m->client);
|
||||
#else
|
||||
ret = mosquitto_loop_start(m->client);
|
||||
if (ret)
|
||||
return ret;
|
||||
#endif
|
||||
|
||||
ret = mosquitto_subscribe(m->client, NULL, m->subscribe, m->qos);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mqtt_stop(struct node *n)
|
||||
{
|
||||
int ret;
|
||||
struct mqtt *m = (struct mqtt *) n->_vd;
|
||||
|
||||
ret = mosquitto_disconnect(m->client);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
#ifdef MQTT_THREAD
|
||||
mqtt_unregister_client(m->client);
|
||||
#else
|
||||
ret = mosquitto_loop_stop(m->client, 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mqtt_init()
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = mosquitto_lib_init();
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
#ifdef MQTT_THREAD
|
||||
ret = pthread_mutex_init(&polling.mutex, NULL);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = pthread_create(&thread, NULL, mqtt_thread, NULL);
|
||||
if (ret)
|
||||
return ret;
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mqtt_deinit()
|
||||
{
|
||||
int ret;
|
||||
|
||||
#ifdef MQTT_THREAD
|
||||
ret = pthread_cancel(thread);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = pthread_join(thread, NULL);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = pthread_mutex_destroy(&polling.mutex);
|
||||
if (ret)
|
||||
return ret;
|
||||
#endif
|
||||
|
||||
ret = mosquitto_lib_cleanup();
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mqtt_read(struct node *n, struct sample *smps[], unsigned cnt)
|
||||
{
|
||||
int pulled;
|
||||
struct mqtt *m = (struct mqtt *) n->_vd;
|
||||
struct sample *smpt[cnt];
|
||||
|
||||
pulled = queue_signalled_pull_many(&m->queue, (void **) smpt, cnt);
|
||||
|
||||
sample_copy_many(smps, smpt, pulled);
|
||||
|
||||
return pulled;
|
||||
}
|
||||
|
||||
int mqtt_write(struct node *n, struct sample *smps[], unsigned cnt)
|
||||
{
|
||||
int ret;
|
||||
struct mqtt *m = (struct mqtt *) n->_vd;
|
||||
|
||||
size_t wbytes;
|
||||
|
||||
char data[1500];
|
||||
|
||||
ret = io_format_sprint(m->format, data, sizeof(data), &wbytes, smps, cnt, SAMPLE_HAS_ALL);
|
||||
if (ret <= 0)
|
||||
return -1;
|
||||
|
||||
ret = mosquitto_publish(m->client, NULL /* mid */, m->publish, wbytes, data, m->qos, m->retain);
|
||||
if (ret)
|
||||
return -1;
|
||||
|
||||
return cnt;
|
||||
}
|
||||
|
||||
int mqtt_fd(struct node *n)
|
||||
{
|
||||
struct mqtt *m = (struct mqtt *) n->_vd;
|
||||
|
||||
return queue_signalled_fd(&m->queue);
|
||||
}
|
||||
|
||||
static struct plugin p = {
|
||||
.name = "mqtt",
|
||||
.description = "Message Queuing Telemetry Transport (libmosquitto)",
|
||||
.type = PLUGIN_TYPE_NODE,
|
||||
.node = {
|
||||
.vectorize = 0,
|
||||
.size = sizeof(struct mqtt),
|
||||
.reverse = mqtt_reverse,
|
||||
.parse = mqtt_parse,
|
||||
.print = mqtt_print,
|
||||
.start = mqtt_start,
|
||||
.destroy = mqtt_destroy,
|
||||
.stop = mqtt_stop,
|
||||
.init = mqtt_init,
|
||||
.deinit = mqtt_deinit,
|
||||
.read = mqtt_read,
|
||||
.write = mqtt_write,
|
||||
.fd = mqtt_fd
|
||||
}
|
||||
};
|
||||
|
||||
REGISTER_PLUGIN(&p)
|
||||
LIST_INIT_STATIC(&p.node.instances)
|
||||
Loading…
Add table
Reference in a new issue