JsonWrapper.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
/***********************************************************************************/
/*  Copyright 2021 SLF                                                                                                                                */
/***********************************************************************************/
/* This file is part of MeteoIO.
    MeteoIO 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.
 
    MeteoIO 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 MeteoIO.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef JSONWRAPPER_H
#define JSONWRAPPER_H
 
#include <meteoio/IOInterface.h>
#include <meteoio/thirdParty/picojson.h>
 
#include <curl/curl.h>
#include <string>
#include <vector>
 
#ifdef _MSC_VER
        #pragma warning(disable:4512) //we don't need any = operator!
#endif
 
namespace mio {
 
class JsonWrapper {
        public:
                JsonWrapper();
                JsonWrapper( const JsonWrapper& );
                ~JsonWrapper();
                JsonWrapper& operator=(const mio::JsonWrapper&);
 
                void setConnectionParams(const std::string& i_proxy_url, const int& i_http_timeout, const bool& i_debug=false);
                void readAndParse(const std::string& request, const std::string& where);
                
                static void printJSON(const picojson::value& v, const unsigned int& depth);
                std::vector<picojson::value> JSONQuery(const std::string& path) const;
                picojson::value goToJSONPath(const std::string& path) const;
                
                std::string getString(const std::string& path) const;
                std::vector<std::string> getStrings(const std::string& path) const;
                double getDouble(const std::string& path) const;
                std::vector<double> getDoubles(const std::string& path) const;
                
        private:
                static std::string indent(const unsigned int& depth);
                static void JSONQuery(const std::string& path, const picojson::value& v, std::vector<picojson::value>& results);
                static picojson::value goToJSONPath(const std::string& path, const picojson::value& v);
                static size_t data_write(void* buf, const size_t size, const size_t nmemb, void* userp);
                bool curl_read(const std::string& url, std::ostream& os);
                
                picojson::value json_tree;
                CURL *curl;
                std::string proxy_url;
                int http_timeout; //time out for http connections
                bool debug, proxy;
                static const int http_timeout_dflt;
};
 
} //end namespace mio
 
#endif