SOLARIS_QT6_DAQ/ClassInfluxDB.cpp

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#include "ClassInfluxDB.h"
#include <regex>
InfluxDB::InfluxDB(){
curl = curl_easy_init();
databaseIP = "";
respondCode = 0;
dataPoints = "";
headers = nullptr;
influxVersionStr = "";
influxVersion = -1;
token = "";
connectionOK = false;
}
InfluxDB::InfluxDB(std::string url, bool verbose){
curl = curl_easy_init();
if( verbose) curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
SetURL(url);
respondCode = 0;
dataPoints = "";
headers = nullptr;
influxVersionStr = "";
influxVersion = -1;
token = "";
connectionOK = false;
}
InfluxDB::~InfluxDB(){
curl_slist_free_all(headers);
curl_easy_cleanup(curl);
}
void InfluxDB::SetURL(std::string url){
// check the last char of url is "/"
if( url.back() != '/') {
this->databaseIP = url + "/";
}else{
this->databaseIP = url;
}
}
void InfluxDB::SetToken(std::string token){
this->token = token;
headers = curl_slist_append(headers, "Accept: application/csv");
if( !token.empty() ) headers = curl_slist_append(headers, ("Authorization: Token " + token).c_str());
}
bool InfluxDB::TestingConnection(bool debug){
CheckInfluxVersion(debug);
if( respond != CURLE_OK ) return false;
connectionOK = true;
return true;
}
std::string InfluxDB::CheckInfluxVersion(bool debug){
curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "ping").c_str());
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
curl_easy_setopt(curl, CURLOPT_HEADER, 1);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallBack);
std::string respondStr;
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &respondStr);
Execute();
if( respond != CURLE_OK) return "CURL Error.";
if( debug) printf("%s\n", respondStr.c_str());
//Find Version from readBuffer
std::regex pattern(R"(X-Influxdb-Version: (.*))");
std::smatch match;
if (regex_search(respondStr, match, pattern)) {
influxVersionStr = match[1];
size_t dotPosition = influxVersionStr.find('.');
if( dotPosition != std::string::npos){
influxVersion = atoi(influxVersionStr.substr(dotPosition-1, 1).c_str());
}
}
// printf("Influx Version : %s | %u\n", influxVersionStr.c_str(), influxVersion);
return respondStr;
}
std::string InfluxDB::CheckDatabases(){
if( ! connectionOK ) return "no connection. try TestConnection() again.";
if( influxVersion == 2 && token.empty() ) return "token no provided, abort.";
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_HEADER, 0);
curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "query").c_str());
std::string postFields="q=Show databases";
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallBack);
std::string respondStr;
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &respondStr);
Execute();
printf("|%s|\n", respondStr.c_str());
if( respond != CURLE_OK) return "CURL Error.";
databaseList.clear();
// Split the input string into lines
std::istringstream iss(respondStr);
std::vector<std::string> lines;
std::string line;
while (std::getline(iss, line)) {
printf("%s\n", line.c_str());
lines.push_back(line);
}
// Extract the third column from each line and store it in a vector
std::vector<std::string> thirdColumn;
for (const auto& l : lines) {
std::istringstream lineIss(l);
std::string token;
for (int i = 0; std::getline(lineIss, token, ','); ++i) {
if (i == 2) { // Third column
databaseList.push_back(token);
break;
}
}
}
// {//============ when output is JSON
// size_t pos = readBuffer.find("values");
// if( pos > 0 ){
// std::string kaka = readBuffer.substr(pos+8);
// pos = kaka.find("}");
// kaka = kaka.substr(0, pos);
// int len = kaka.length();
// bool startFlag = false;
// std::string lala;
// char yaya = '"';
// for( int i = 0; i < len; i++){
// if( startFlag == false && kaka[i] == yaya ) {
// startFlag = true;
// lala = "";
// continue;
// }
// if( startFlag && kaka[i] == yaya ){
// startFlag = false;
// databaseList.push_back(lala);
// continue;
// }
// if( startFlag ) lala += kaka[i];
// }
// }
// }
return respondStr;
}
void InfluxDB::PrintDataBaseList(){
for( size_t i = 0; i < databaseList.size(); i++){
printf("%2ld| %s\n", i, databaseList[i].c_str());
}
}
std::string InfluxDB::Query(std::string databaseName, std::string influxQL_query){
if( ! connectionOK ) return "no connection. try TestConnection() again.";
if( influxVersion == 2 && token.empty() ) return "token no provided, abort.";
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_HEADER, 0);
curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "query?db=" + databaseName).c_str());
std::string postFields = "q=" + influxQL_query;
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallBack);
std::string respondStr;
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &respondStr);
Execute();
//printf("|%s|\n", readBuffer.c_str());
return respondStr;
}
void InfluxDB::CreateDatabase(std::string databaseName){
if( ! connectionOK ) return ;
if( influxVersion == 2 && token.empty() ) return;
curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "query").c_str());
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_HEADER, 0);
std::string postFields = "q=CREATE DATABASE " + databaseName;
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
Execute();
}
void InfluxDB::AddDataPoint(std::string fullString){
// printf(" InfluxDB::%s |%s| \n", __func__, fullString.c_str());
dataPoints += fullString + "\n";
}
void InfluxDB::ClearDataPointsBuffer(){
// printf(" InfluxDB::%s \n", __func__);
dataPoints = "";
}
void InfluxDB::PrintDataPoints(){
// printf(" InfluxDB::%s \n", __func__);
printf("%s\n", dataPoints.c_str());
}
void InfluxDB::WriteData(std::string databaseName){
if( ! connectionOK ) return ;
if( influxVersion == 2 && token.empty() ) return;
// printf(" InfluxDB::%s \n", __func__);
if( dataPoints.length() == 0 ) return;
//printf("|%s|\n", (databaseIP + "write?db=" + databaseName).c_str());
curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "write?db=" + databaseName).c_str());
curl_easy_setopt(curl, CURLOPT_POST, 1L);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_HEADER, 0);
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(dataPoints.length()));
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, dataPoints.c_str());
Execute();
}
void InfluxDB::Execute(){
// printf(" InfluxDB::%s \n", __func__);
try{
respond = curl_easy_perform(curl);
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &respondCode);
//printf("==== respond %d (OK = %d)\n", respond, CURLE_OK);
if( respond != CURLE_OK ) printf("############# InfluxDB::Execute fail | %ld\n", respondCode);
} catch (std::exception& e){ // in case of unexpected error
printf("%s\n", e.what());
respond = CURLE_SEND_ERROR;
}
}
size_t InfluxDB::WriteCallBack(char *contents, size_t size, size_t nmemb, void *userp){
// printf(" InfluxDB::%s \n", __func__);
((std::string*)userp)->append((char*)contents, size * nmemb);
return size * nmemb;
}