void SonicDBConfig::parseDatabaseConfig()

in common/dbconnector.cpp [22:76]
52 lines of code
7 McCabe index (conditional complexity)

void SonicDBConfig::parseDatabaseConfig(const string &file,
                    std::map<std::string, RedisInstInfo> &inst_entry,
                    std::unordered_map<std::string, SonicDBInfo> &db_entry,
                    std::unordered_map<int, std::string> &separator_entry)
{
    ifstream i(file);
    if (i.good())
    {
        try
        {
            json j;
            i >> j;
            for (auto it = j["INSTANCES"].begin(); it!= j["INSTANCES"].end(); it++)
            {
               string instName = it.key();
               string socket;
               auto path = it.value().find("unix_socket_path");
               if (path != it.value().end())
               {
                    socket = *path;
               }
               string hostname = it.value().at("hostname");
               int port = it.value().at("port");
               inst_entry[instName] = {socket, hostname, port};
            }

            for (auto it = j["DATABASES"].begin(); it!= j["DATABASES"].end(); it++)
            {
               string dbName = it.key();
               string instName = it.value().at("instance");
               int dbId = it.value().at("id");
               string separator = it.value().at("separator");
               db_entry[dbName] = {instName, dbId, separator};

               separator_entry.emplace(dbId, separator);
            }
        }

        catch (domain_error& e)
        {
            SWSS_LOG_ERROR("key doesn't exist in json object, NULL value has no iterator >> %s\n", e.what());
            throw runtime_error("key doesn't exist in json object, NULL value has no iterator >> " + string(e.what()));
        }
        catch (exception &e)
        {
            SWSS_LOG_ERROR("Sonic database config file syntax error >> %s\n", e.what());
            throw runtime_error("Sonic database config file syntax error >> " + string(e.what()));
        }
    }
    else
    {
        SWSS_LOG_ERROR("Sonic database config file doesn't exist at %s\n", file.c_str());
        throw runtime_error("Sonic database config file doesn't exist at " + file);
    }
}