Method load

plugins/experimental/txn_box/plugin/src/stats.cc:131–223

}

Rv<Directive::Handle>
Do_stat_define::load(Config &cfg, CfgStaticData const *, YAML::Node drtv_node, swoc::TextView const &, swoc::TextView const &,
                     YAML::Node key_value)
{
  auto   self = new self_type();
  Handle handle(self);

  // Prefix is optional - defaults to "plugin.txn_box"
  // Need this before the name so it can be combined as needed.
  auto     prefix_node = key_value[PREFIX_TAG];
  TextView prefix;
  if (prefix_node) {
    auto &&[prefix_expr, prefix_errata]{cfg.parse_expr(prefix_node)};
    if (!prefix_errata.is_ok()) {
      prefix_errata.note("While parsing {} directive at {}.", KEY, drtv_node.Mark());
      return std::move(prefix_errata);
    }
    if (!prefix_expr.is_literal() || !prefix_expr.result_type().can_satisfy(STRING)) {
      return Errata(S_ERROR, "{} value at {} for {} directive at {} must be a literal string.", PREFIX_TAG, prefix_node.Mark(), KEY,
                    drtv_node.Mark());
    }

    prefix = std::get<IndexFor(STRING)>(std::get<Expr::LITERAL>(prefix_expr._raw));
    drtv_node.remove(prefix_node);
  } else {
    prefix = "plugin.txn_box"_tv; // default if not explicitly set.
  }
  // Note - prefix isn't localized yet, need to wait for name.

  auto name_node = key_value[NAME_TAG];
  if (!name_node) {
    return Errata(S_ERROR, "{} directive at {} must have a {} key.", KEY, drtv_node.Mark(), NAME_TAG);
  }

  auto &&[name_expr, name_errata]{cfg.parse_expr(name_node)};
  if (!name_errata.is_ok()) {
    name_errata.note("While parsing {} directive at {}.", KEY, drtv_node.Mark());
    return std::move(name_errata);
  }
  if (!name_expr.is_literal() || !name_expr.result_type().can_satisfy(STRING)) {
    return Errata(S_ERROR, "{} value at {} for {} directive at {} must be a literal string.", NAME_TAG, name_node.Mark(), KEY,
                  drtv_node.Mark());
  }
  TextView name = std::get<IndexFor(STRING)>(std::get<Expr::LITERAL>(name_expr._raw));
  if (name.empty()) {
    return Errata(S_ERROR, "{} value at {} for {} directive at {} must be a non-empty literal string.", NAME_TAG, name_node.Mark(),
                  KEY, drtv_node.Mark());
  }

  // Localize prefix and name in the same string, storing views in to that string.
  if (prefix.empty()) {
    self->_full_name = self->_name = cfg.localize(name, Config::LOCAL_CSTR);
  } else {
    swoc::FixedBufferWriter w{cfg.allocate_cfg_storage(prefix.size() + 1 + name.size() + 1)};
    w.write(prefix).write('.').write(name).write('\0');
    self->_full_name = TextView{w.view()}.remove_suffix(1); // drop terminal null.
    self->_name      = self->_full_name.suffix(name.size());
  }