158 lines
4.1 KiB
C++
158 lines
4.1 KiB
C++
#include "influxdb.h"
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InfluxDB::InfluxDB(std::string url, bool verbose){
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curl = curl_easy_init();
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if( verbose) curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
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SetURL(url);
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respondCode = 0;
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dataPoints = "";
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}
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InfluxDB::~InfluxDB(){
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curl_easy_cleanup(curl);
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}
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void InfluxDB::SetURL(std::string url){
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// check the last char of url is "/"
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if( url.back() != '/') {
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this->databaseIP = url + "/";
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}else{
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this->databaseIP = url;
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}
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}
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bool InfluxDB::TestingConnection(){
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CheckDatabases();
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if( respond != CURLE_OK ) return false;
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return true;
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}
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std::string InfluxDB::CheckDatabases(){
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curl_easy_setopt(curl, CURLOPT_POST, 1);
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curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "/query").c_str());
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std::string postFields="q=Show databases";
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curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
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curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallBack);
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std::string readBuffer;
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
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Execute();
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//printf("|%s|\n", readBuffer.c_str());
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if( respond != CURLE_OK) return "";
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databaseList.clear();
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size_t pos = readBuffer.find("values");
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if( pos > 0 ){
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std::string kaka = readBuffer.substr(pos+8);
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pos = kaka.find("}");
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kaka = kaka.substr(0, pos);
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int len = kaka.length();
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bool startFlag = false;
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std::string lala;
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char yaya = '"';
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for( int i = 0; i < len; i++){
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if( startFlag == false && kaka[i] == yaya ) {
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startFlag = true;
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lala = "";
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continue;
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}
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if( startFlag && kaka[i] == yaya ){
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startFlag = false;
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databaseList.push_back(lala);
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continue;
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}
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if( startFlag ) lala += kaka[i];
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}
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}
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return readBuffer;
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}
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std::string InfluxDB::Query(std::string databaseName, std::string query){
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curl_easy_setopt(curl, CURLOPT_POST, 1);
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curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "/query?db=" + databaseName).c_str());
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std::string postFields = "q=" + query;
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curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
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curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallBack);
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std::string readBuffer;
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
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Execute();
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//printf("|%s|\n", readBuffer.c_str());
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return readBuffer;
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}
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void InfluxDB::CreateDatabase(std::string databaseName){
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curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "/query").c_str());
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curl_easy_setopt(curl, CURLOPT_POST, 1);
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std::string postFields = "q=CREATE DATABASE " + databaseName;
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curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(postFields.length()));
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curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postFields.c_str());
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Execute();
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}
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void InfluxDB::AddDataPoint(std::string fullString){
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dataPoints += fullString + "\n";
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}
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void InfluxDB::ClearDataPointsBuffer(){
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dataPoints = "";
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}
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void InfluxDB::PrintDataPoints(){
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printf("%s\n", dataPoints.c_str());
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}
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void InfluxDB::WriteData(std::string databaseName){
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if( dataPoints.length() == 0 ) return;
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//printf("|%s|\n", (databaseIP + "write?db=" + databaseName).c_str());
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curl_easy_setopt(curl, CURLOPT_URL, (databaseIP + "write?db=" + databaseName).c_str());
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curl_easy_setopt(curl, CURLOPT_POST, 1L);
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curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, static_cast<long>(dataPoints.length()));
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curl_easy_setopt(curl, CURLOPT_POSTFIELDS, dataPoints.c_str());
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Execute();
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}
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void InfluxDB::Execute(){
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try{
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respond = curl_easy_perform(curl);
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curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &respondCode);
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//printf("==== respond code %ld (OK = %d)\n", respond, CURLE_OK);
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if( respond != CURLE_OK) printf("############# InfluxDB::Execute fail\n");
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} catch (std::exception& e){ // in case of unexpected error
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printf("%s\n", e.what());
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respond = CURLE_SEND_ERROR;
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}
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}
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size_t InfluxDB::WriteCallBack(char *contents, size_t size, size_t nmemb, void *userp){
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((std::string*)userp)->append((char*)contents, size * nmemb);
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return size * nmemb;
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}
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