satdump/src-core/common/tracking/tle.cpp

#define SATDUMP_DLL_EXPORT 1
#include "tle.h"
#include <fstream>
#include "common/utils.h"
#include "logger.h"
#include "core/config.h"
#include <filesystem>

namespace satdump
{
    TLERegistry general_tle_registry;

    void updateTLEFile(std::string path)
    {
        std::vector<int> norads_to_fetch = config::main_cfg["tle_settings"]["tles_to_fetch"].get<std::vector<int>>();

        if (!std::filesystem::exists(std::filesystem::path(path).parent_path()))
            std::filesystem::create_directories(std::filesystem::path(path).parent_path());

        std::ofstream outfile(path + ".tmp");
        bool success = true;

        for (int norad : norads_to_fetch)
        {
            std::string url_str = config::main_cfg["tle_settings"]["url_template"].get<std::string>();

            while (url_str.find("%NORAD%") != std::string::npos)
                url_str.replace(url_str.find("%NORAD%"), 7, std::to_string(norad));

            logger->info(url_str);
            std::string result;

            if (perform_http_request(url_str, result) != 1)
                outfile << result;
            else
                success = false;
        }

        outfile.close();

        if (success)
        {
            if (std::filesystem::exists(path))
                std::filesystem::remove(path);
            std::filesystem::rename(path + ".tmp", path);
        }
        else
        {
            logger->error("Error updating TLEs. Not updated.");
        }

        if (std::filesystem::exists(path + ".tmp"))
            std::filesystem::remove(path + ".tmp");
    }

    void loadTLEFileIntoRegistry(std::string path)
    {
        logger->info("Loading TLEs from " + path);

        // Parse
        std::ifstream tle_file(path);

        std::string line;
        int line_count = 0;
        int norad = 0;
        std::string name, tle1, tle2;
        while (getline(tle_file, line))
        {
            if (line_count % 3 == 0)
            {
                name = line;
                name.erase(name.end() - 1); // Remove newline
                name.erase(std::find_if(name.rbegin(), name.rend(), [](char &c)
                                        { return c != ' '; })
                               .base(),
                           name.end()); // Remove useless spaces
            }
            else if (line_count % 3 == 1)
            {
                tle1 = line;
            }
            else if (line_count % 3 == 2)
            {
                tle2 = line;

                std::string noradstr = tle2.substr(2, tle2.substr(2, tle2.size() - 1).find(' '));
                norad = std::stoi(noradstr);

                // Delete duplicates
                std::remove_if(general_tle_registry.begin(), general_tle_registry.end(), [norad](TLE t)
                               { return t.norad == norad; });

                logger->trace("Add satellite " + name);
                general_tle_registry.push_back({norad, name, tle1, tle2});
            }

            line_count++;
        }
    }

    void fetchTLENow(int norad)
    {
        std::string url_str = config::main_cfg["tle_settings"]["url_template"].get<std::string>();

        while (url_str.find("%NORAD%") != std::string::npos)
            url_str.replace(url_str.find("%NORAD%"), 7, std::to_string(norad));

        logger->info(url_str);
        std::string result;

        if (perform_http_request(url_str, result) != 1)
        {
            std::vector<std::string> lines = splitString(result, '\n');
            TLE newTLE;
            newTLE.name = lines[0];
            newTLE.name.erase(newTLE.name.end() - 1); // Remove newline
            newTLE.name.erase(std::find_if(newTLE.name.rbegin(), newTLE.name.rend(), [](char &c)
                                           { return c != ' '; })
                                  .base(),
                              newTLE.name.end()); // Remove useless spaces
            newTLE.line1 = lines[1];
            newTLE.line2 = lines[2];

            std::string noradstr = newTLE.line2.substr(2, newTLE.line2.substr(2, newTLE.line2.size() - 1).find(' '));
            newTLE.norad = std::stoi(noradstr);

            general_tle_registry.push_back(newTLE);
        }
    }
}