WLG/mqttclient/mqtt_client.cpp

#include "mqtt_client.h"
#include <signal.h>
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#include <malloc.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <memory.h>
#include <errno.h>
#include <json/json.h>
#include <sys/types.h>
#include <zlog.h>

#include "common/global.hpp"
#include "utility/secure.hpp"

extern zlog_category_t *zct;
extern zlog_category_t *zbt;

static char res_topic[100];
static char req_topic[100];
struct mosquitto *mosq = NULL;
static int mid_sent = 0;
struct userdata ud;
connect_callback my_connect_callback = NULL;
disconnect_callback my_disconnect_callback = NULL;
message_callback my_message_callback = NULL;
subscribe_callback my_subscribe_callback = NULL;
log_callback my_log_callback = NULL;
publish_callback my_publish_callback = NULL;

void register_collback(connect_callback connect_c, message_callback message_c, subscribe_callback subscribe_c, log_callback log_c, disconnect_callback disconnect_c, publish_callback publish_c) {
    my_connect_callback = connect_c;
    my_message_callback = message_c;
    my_subscribe_callback = subscribe_c;
    my_log_callback = log_c;
    my_disconnect_callback = disconnect_c;
    my_publish_callback = publish_c;
}

int data_publish(const char *str, const char *topic) {
    int ret = -1;
    if (mosq != NULL) {
        std::string strTopic = std::string(topic);
        if (strTopic.find("cmd") != std::string::npos || strTopic.find("configureInfo") != std::string::npos) {
            std::string pData = (std::string)str;
            char *base64_aes = new char[pData.length() * 2];
            memset(base64_aes, 0, pData.length() * 2);
            secure::instance().Base64Encode((unsigned char *)pData.c_str(), base64_aes, pData.length());
            ret = mosquitto_publish(mosq, &mid_sent, topic, strlen(base64_aes), base64_aes, ud.topic_qos, false);

            if (base64_aes != NULL) delete[] base64_aes;
            if (ret != MOSQ_ERR_SUCCESS) {
                zlog_error(zct, "fail to send mqtt msg, ret: [%s], topic: %s, str: %s", mosquitto_strerror(ret), topic, str);
            }
        } else {
            ret = mosquitto_publish(mosq, &mid_sent, topic, strlen(str), str, ud.topic_qos, false);
            if (ret != MOSQ_ERR_SUCCESS) {
                zlog_error(zct, "fail to send mqtt msg, ret: [%s], topic: %s, str: %s", mosquitto_strerror(ret), topic, str);
            }
        }
    }
    if (ret != 0) {
        disconnect();
    }
    return ret;
}

int data_publish_wave(WAVE_CONTAIN *str, const char *topic) {
    int ret = -1;
    if (mosq != NULL) {
        zlog_info(zct, "data_publish:Unit : %s type:%d flag : %d channelid : %s total : %d count : %d number :%d floats:%f floate:%f\n", str->SensorEngineeringUnit, str->type, str->flag, str->channelId, str->total, str->count, str->number, str->waveData[0],
                  str->waveData[(str->number - 2)]);
        ret = mosquitto_publish(mosq, &mid_sent, topic, sizeof(WAVE_CONTAIN), str, ud.topic_qos, false);
        if (ret != MOSQ_ERR_SUCCESS) {
            zlog_error(zct, "fail to send mqtt msg, ret: [%s], topic: %s, str: %s", mosquitto_strerror(ret), topic, str);
        }
    }
    return ret;
}

int subscribe(const char *topic, int qos) {
    int ret = mosquitto_subscribe(mosq, NULL, topic, qos);
    if (ret != MOSQ_ERR_SUCCESS) {
        zlog_error(zct, "fail to subscribe, ret: [%s], topic: %s", mosquitto_strerror(ret), topic);
    }
    return ret;
}

int unsubscribe(const char *topic) {
    int ret = mosquitto_unsubscribe(mosq, NULL, topic);
    if (ret != MOSQ_ERR_SUCCESS) {
        zlog_error(zct, "fail to unsubscribe, ret: [%s], topic: %s", mosquitto_strerror(ret), topic);
    }
    return ret;
}

int disconnect() { return mosquitto_disconnect(mosq); }

int reconnect() { return mosquitto_reconnect(mosq); }
int start_client(const char *boardname, const char *gwid, const char *gwip, const char *gwver, const char *gwcode, std::string &salt) {
    char *id = NULL;
    char *id_prefix = NULL;
    char *host;
    int port = 51613;
    char *bind_address = NULL;
    int keepalive = 60;
    bool clean_session = true;
    int rc = 0;
    char hostname[256];
    int len;
    char will_payload[100];
    long will_payloadlen = 0;
    int will_qos = 0;
    bool will_retain = false;
    char *will_topic = NULL;
    char *psk = NULL;
    char *psk_identity = NULL;
    mqttsdata_t mqttsdata;
    signal(SIGCHLD, SIG_IGN); // signal函数作用：为一个信号注册一个信号处理函数。其中SIGCHLD：在一个进程终止或者停止时，将SIGCHLD信号发送给父进程。而信号处理函数是一个函数指针，不过它使用的是预定义函数SIG_IGN(忽视信号)
    signal(SIGPIPE, SIG_IGN);
    if (my_connect_callback == NULL || my_message_callback == NULL || my_subscribe_callback == NULL || my_log_callback == NULL) {
        zlog_error(zct, "please call the register_collback function first.");
        return -1;
    }

    int qos = readIntValue("config", "qos", (char *)GlobalConfig::Config_G.c_str());    
    memset(&mqttsdata, 0, sizeof(mqttsdata_t));
    memcpy(mqttsdata.gwid, gwid, strlen(gwid));

    salt = std::string(mqttsdata.salt);
    memset(&ud, 0, sizeof(struct userdata));
    ud.eol = true;
    char localip[100];
    sprintf(localip, "%s", gwip);
    host = localip;
    mqttsdata.port = GlobalConfig::ServerPort;
    port = GlobalConfig::ServerPort;
#ifdef WIFI_MODULE
    mqttsdata.qos = 0;
#else
    mqttsdata.qos = qos;
#endif
    zlog_info(zct, "mqttsdata.qos = %d", mqttsdata.qos);

    std::string username = ReadStrByOpt(SERVERCONFIG, "Server", "UserName");
    std::string password = ReadStrByOpt(SERVERCONFIG, "Server", "Password");
    if (username == "" || password == "") {
        username = "chaos";
        password = "HSD272*#xkd";
    }

    char userName[100];
    memset(userName, 0, 100);
    sprintf(userName, "%s", username.c_str());

    char passWord[100];
    memset(passWord, 0, 100);
    sprintf(passWord, "%s", password.c_str());
    zlog_info(zbt, "userName = %s , passWord = %s", userName, passWord);
    ud.username = userName;
    ud.password = passWord;

    ud.gwid = mqttsdata.gwid;
    ud.dataUrl = mqttsdata.dataUrl;
    ud.fsUrl = mqttsdata.fsUrl;
    will_qos = mqttsdata.qos;
    ud.topic_qos = will_qos;
    ud.topic_count++;
    ud.topics = (char **)realloc(ud.topics, ud.topic_count * sizeof(char *));
    if (ud.topics == NULL) {
        zlog_error(zbt, "fail to realloc for ud.topics");
        return 1;
    }

    memset(req_topic, 0, 100);
    sprintf(req_topic, "dev/cidwcc");
    ud.topics[ud.topic_count - 1] = req_topic;
    ud.verbose = 1;

    memset(res_topic, 0, 100);
    sprintf(res_topic, "gw/will");
    zlog_info(zct, "res_topic:%s", res_topic);
    will_topic = res_topic;
    ud.resp_topic = res_topic;
    sprintf(will_payload, "{\"cmd\":\"15\",\"gwID\":\"%s\"}", mqttsdata.gwid);
    will_payloadlen = strlen(will_payload);
    zlog_info(zct, "will_payload:%s,will_payloadlen:%ld", will_payload, will_payloadlen); 
    
    hostname[0] = '\0';
    gethostname(hostname, 256);
    hostname[255] = '\0';
    len = strlen("mosqsub/-") + 6 + strlen(hostname);
    mosquitto_lib_init();
    mosq = mosquitto_new(NULL, true, &ud);
    if (!mosq) {
        zlog_error(zct, "fail to mosquitto_new, errno:%d", errno);  
        free(ud.topics);      
        mosquitto_lib_cleanup();
        return 1;
    }

    mosquitto_log_callback_set(mosq, my_log_callback);

    if (!psk) {
        psk = (char *)malloc(32 * sizeof(char));
        if (!psk) {
            free(ud.topics);
            mosquitto_destroy(mosq);
            mosquitto_lib_cleanup();
            zlog_error(zct, "Error: No free space 1");
            return -1;
        }
        memset(psk, 0, 32);
        snprintf(psk, 32, "%d", getpid());
        psk_identity = (char *)malloc(32 * sizeof(char));
        if (!psk_identity) {
            free(ud.topics);
            mosquitto_destroy(mosq);
            mosquitto_lib_cleanup();
            zlog_error(zct, "Error: No free space 2");
            free(psk);
            return -1;
        }
        strncpy(psk_identity, psk, 32);
    }
    if (mosquitto_will_set(mosq, will_topic, will_payloadlen, will_payload, will_qos, will_retain)) {
        zlog_error(zct, "Error: Problem setting will.");
        goto mosq_free;
    }

    if (ud.username && mosquitto_username_pw_set(mosq, ud.username, ud.password)) {
        zlog_error(zct, "Error: Problem setting username and password.");
        goto mosq_free;
    }

    mosquitto_connect_callback_set(mosq, my_connect_callback);
    mosquitto_disconnect_callback_set(mosq, my_disconnect_callback);
    mosquitto_message_callback_set(mosq, my_message_callback);
    mosquitto_publish_callback_set(mosq, my_publish_callback);
    mosquitto_subscribe_callback_set(mosq, my_subscribe_callback);

    rc = mosquitto_connect_bind(mosq, host, port, keepalive, bind_address);
    zlog_info(zct, "host = %s port = %d  rc = %d", host, port, rc);
    if (rc) {
        zlog_error(zct, "Unable to connect (%d).", rc);
        goto mosq_free;
    }

    rc = mosquitto_loop_forever(mosq, -1, 1);
    if (rc) {
        zlog_error(zct, "Error: %s", mosquitto_strerror(rc));
    }

mosq_free:
    mosquitto_destroy(mosq);
    mosquitto_lib_cleanup();
    if (ud.topics != NULL) {
        free(ud.topics);
    }
    if (psk) {
        free(psk);
    }
    if (psk_identity) {
        free(psk_identity);
    }
    sleep(1);
    return 0;
}