ProfileCache.h

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namespace ProfileCache {
    inline file::ptr FetchFile(const char * context, const char * name, const char * webURL, t_filetimestamp acceptableAge, abort_callback & abort) {
        const double timeoutVal = 5;

        pfc::string_formatter path ( core_api::get_profile_path() );
        path.fix_dir_separator('\\');
        path << context;
        try {
            filesystem::g_create_directory(path, abort);
        } catch(exception_io_already_exists) {}
        path << "\\" << name;

        bool fetch = false;
        file::ptr fLocal;
        
        try {
            filesystem::g_open_timeout(fLocal, path, filesystem::open_mode_write_existing, timeoutVal, abort);
            fetch = fLocal->get_timestamp(abort) < filetimestamp_from_system_timer() - acceptableAge;
        } catch(exception_io_not_found) {
            filesystem::g_open_timeout(fLocal, path, filesystem::open_mode_write_new, timeoutVal, abort);
            fetch = true;
        }
        if (fetch) {
            fLocal->resize(0, abort);
            file::ptr fRemote;
            try {
                filesystem::g_open(fRemote, webURL, filesystem::open_mode_read, abort);
            } catch(exception_io_not_found) {
                fLocal.release();
                try { filesystem::g_remove_timeout(path, timeoutVal, abort); } catch(...) {}
                throw;
            }
            pfc::array_t<t_uint8> buffer; buffer.set_size(64*1024);
            for(;;) {
                t_size delta = buffer.get_size();
                delta = fRemote->read(buffer.get_ptr(), delta, abort);
                fLocal->write(buffer.get_ptr(), delta, abort);
                if (delta < buffer.get_size()) break;
            }
            fLocal->seek(0, abort);
        }
        return fLocal;
    }
};