Method parse_file

src/common/ConfUtils.cc:108–138

We load the whole file into memory and then parse it. Although this is not * the optimal approach, it does mean that most of this code can be shared with * the bufferlist loading function. Since bufferlists are always in-memory, the * load_from_buffer interface works well for them. * In general, configuration files should be a few kilobytes at maximum, so * loading the whole configuration in

 * loading the whole configuration into memory shouldn't be a problem.
 */
int ConfFile::parse_file(const std::string &fname,
			 std::ostream *warnings)
{
  clear();
  try {
    if (auto file_size = fs::file_size(fname); file_size > MAX_CONFIG_FILE_SZ) {
      *warnings << __func__ << ": config file '" << fname
		<< "' is " << file_size << " bytes, "
		<< "but the maximum is " << MAX_CONFIG_FILE_SZ;
      return -EINVAL;
    }
  } catch (const fs::filesystem_error& e) {
    std::error_code ec;
    auto is_other = fs::is_other(fname, ec);
    if (!ec && is_other) {
      // /dev/null?
      return 0;
    } else {
      *warnings << __func__ << ": " << e.what();
      return -e.code().value();
    }
  }
  std::ifstream ifs{fname};
  std::string buffer{std::istreambuf_iterator<char>(ifs),
			               std::istreambuf_iterator<char>()};
  if (parse_buffer(buffer, warnings)) {
    return 0;
  } else {
    return -EINVAL;
  }
}

namespace {