neuron/plugins/mqtt/command/command.c

/**
 * NEURON IIoT System for Industry 4.0
 * Copyright (C) 2020-2022 EMQ Technologies Co., Ltd All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 **/
#include <stdio.h>
#include <stdlib.h>

#include "ping.h"
#include "read_write.h"
#include "utils/log.h"

#include "command.h"

// Ping topic
static int ping_response(char **output_str, neu_plugin_t *plugin,
                         neu_json_mqtt_t *mqtt)
{
    *output_str = command_ping(plugin, mqtt);
    return 0;
}

// Read tags with group config
static int read_response(mqtt_response_t *response, neu_plugin_t *plugin,
                         neu_json_mqtt_t *mqtt, char *json_str)
{
    UNUSED(response);

    neu_json_read_req_t *json = NULL;
    int                  rc   = neu_json_decode_read_req(json_str, &json);
    if (0 == rc) {
        command_rw_read_once_request(plugin, mqtt, json);
        neu_json_decode_read_req_free(json);
    }

    return rc;
}

// Write tags with group config
static int write_response(mqtt_response_t *response, neu_plugin_t *plugin,
                          neu_json_mqtt_t *mqtt, char *json_str)
{
    neu_json_write_req_t *req = NULL;
    int                   rc  = neu_json_decode_write_req(json_str, &req);
    if (0 == rc) {
        uint32_t req_id = neu_plugin_get_event_id(plugin);
        int      ret    = command_rw_write_request(plugin, mqtt, req, req_id);

        if (0 < req_id && ret == 0) {
            response->context_add(plugin, req_id, mqtt, NULL,
                                  response->topic_pair, false);
        }

        neu_json_decode_write_req_free(req);
    }

    return rc;
}

void command_response_handle(mqtt_response_t *response)
{
    neu_plugin_t *plugin = (neu_plugin_t *) response->plugin;

    if (NULL == response->topic_name || NULL == response->payload) {
        return;
    }

    char *json_str = malloc(response->len + 1);
    if (NULL == json_str) {
        return;
    }

    memset(json_str, 0x00, response->len + 1);
    memcpy(json_str, response->payload, response->len);

    neu_json_mqtt_t *mqtt    = NULL;
    char *           ret_str = NULL;
    int              rc      = neu_json_decode_mqtt_req(json_str, &mqtt);

    if (0 != rc) {
        zlog_error(neuron, "JSON parsing mqtt failed");
        return;
    }

    switch (response->type) {
    case TOPIC_TYPE_PING: {
        // Ping
        rc = ping_response(&ret_str, plugin, mqtt);
        break;
    }

    case TOPIC_TYPE_READ: {
        rc = read_response(response, plugin, mqtt, json_str);
        break;
    }

    case TOPIC_TYPE_WRITE: {
        rc = write_response(response, plugin, mqtt, json_str);
        break;
    }
    default:
        assert(1 == 0);
        break;
    }

    if (0 != rc) {
        neu_json_error_resp_t error = { .error = NEU_ERR_BODY_IS_WRONG };
        neu_json_encode_with_mqtt(&error, neu_json_encode_error_resp, mqtt,
                                  neu_json_encode_mqtt_resp, &ret_str);
    }

    if (NULL != ret_str) {
        response->context_add(plugin, 0, mqtt, ret_str, response->topic_pair,
                              true);
    }

    if (NULL != json_str) {
        free(json_str);
    }

    neu_json_decode_mqtt_req_free(mqtt);
}

char *command_read_once_response(neu_reqresp_head_t *   head,
                                 neu_resp_read_group_t *data, int format)
{
    return command_rw_read_once_response(head, data, format);
    return NULL;
}

char *command_read_periodic_response(neu_reqresp_trans_data_t *data, int format)
{
    return command_rw_read_periodic_response(data, format);
}

// char *command_write_response(neu_json_mqtt_t *parse_header,
// neu_data_val_t * resp_val)
//{
// return command_rw_write_response(parse_header, resp_val);
//}