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new(configuration): allow defining plugin config as YAML maps

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Signed-off-by: Jason Dellaluce <jasondellaluce@gmail.com>
This commit is contained in:
Jason Dellaluce 2022-01-12 15:31:59 +00:00 committed by poiana
parent f4b79296fc
commit 5e354859a9
1 changed files with 64 additions and 0 deletions
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64
userspace/falco/configuration.h
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@ -280,6 +280,56 @@ private:
};
namespace YAML {
template<>
struct convert<nlohmann::json> {
static bool decode(const Node& node, nlohmann::json& res)
{
int int_val;
double double_val;
bool bool_val;
std::string str_val;
nlohmann::json sub{};
switch (node.Type()) {
case YAML::NodeType::Map:
for (auto &&it: node)
{
YAML::convert<nlohmann::json>::decode(it.second, sub);
res[it.first.as<std::string>()] = sub;
}
break;
case YAML::NodeType::Sequence:
for (auto &&it : node)
{
YAML::convert<nlohmann::json>::decode(it, sub);
res.emplace_back(sub);
}
break;
case YAML::NodeType::Scalar:
if (YAML::convert<int>::decode(node, int_val))
{
res = int_val;
}
else if (YAML::convert<double>::decode(node, double_val))
{
res = double_val;
}
else if (YAML::convert<bool>::decode(node, bool_val))
{
res = bool_val;
}
else if (YAML::convert<std::string>::decode(node, str_val))
{
res = str_val;
}
default:
break;
}
return true;
}
};
template<>
struct convert<falco_configuration::plugin_config> {
@ -289,6 +339,20 @@ namespace YAML {
if(node[key])
{
// By convention, if the config is a YAML map we convert it
// in a JSON object string. This is useful for plugins implementing
// the `get_init_schema` API symbol, which right now support the
// JSON Schema specific. If we ever support other schema/data types,
// we may want to bundle the conversion logic in an ad-hoc class.
// The benefit of this is being able of parsing/editing the config as
// a YAML map instead of having an opaque string.
if (node[key].IsMap())
{
nlohmann::json json;
YAML::convert<nlohmann::json>::decode(node[key], json);
value = json.dump();
; return true;
}
value = node[key].as<std::string>();
return true;
}