code/libcode-json
code/libcode-json
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Add basic model validation after deserialization

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This commit is contained in:
G.H.O.S.T 2024-12-28 21:13:24 +01:00
parent cf503e6bfa
commit 5ab48d8c36
Signed by: G.H.O.S.T
GPG Key ID: 3BD93EABD1407B82
1 changed files with 39 additions and 3 deletions
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42
code/json/marshaling.hxx
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@ -68,11 +68,27 @@ namespace code::json
}; };
template<member_name_t Name, auto Member> template<typename, typename = std::void_t<>>
struct has_validator
: std::false_type
{};
template<typename T>
struct has_validator<
T,
std::void_t<
decltype(std::declval<T const&>().validate(std::declval<marshaling_context_t*>()))
>
>
: std::true_type
{};
template<member_name_t Name, auto Member, typename Validator = void>
struct member_t struct member_t
{ {
using T = member_traits<decltype(Member)>::class_type; using T = member_traits<decltype(Member)>::class_type;
using M = member_traits<decltype(Member)>::member_type; using M = member_traits<decltype(Member)>::member_type;
using V = Validator;
static constexpr bool is_optional{ static constexpr bool is_optional{
is_optional_v<M> is_optional_v<M>
@ -97,7 +113,13 @@ namespace code::json
throw std::runtime_error{"missing field '" + Name.str() + "'"}; throw std::runtime_error{"missing field '" + Name.str() + "'"};
} }
instance.*Member = marshaling_traits<M>::unmarshal(v.get(Name), context); M value = marshaling_traits<M>::unmarshal(v.get(Name), context);
if constexpr (!std::is_same_v<V, void>) {
V::validate(value, context);
}
instance.*Member = std::move(value);
} }
struct pointer_t struct pointer_t
@ -133,7 +155,13 @@ namespace code::json
throw std::runtime_error{ "missing field '" + to_string(ptr()) + "'" }; throw std::runtime_error{ "missing field '" + to_string(ptr()) + "'" };
} }
instance.*Member = marshaling_traits<M>::unmarshal(*ptr_v, context); M value = marshaling_traits<M>::unmarshal(*ptr_v, context);
if constexpr (!std::is_same_v<V, void>) {
V::validate(value, context);
}
instance.*Member = std::move(value);
} }
}; };
@ -168,6 +196,10 @@ namespace code::json
{ {
First::unmarshal(instance, v, context); First::unmarshal(instance, v, context);
((Members::unmarshal(instance, v, context)), ...); ((Members::unmarshal(instance, v, context)), ...);
if constexpr (has_validator<T>::value) {
instance.validate(context);
}
} }
static static
@ -209,6 +241,10 @@ namespace code::json
((Bases::json::do_unmarshal(instance, v, context)), ...); ((Bases::json::do_unmarshal(instance, v, context)), ...);
First::unmarshal(instance, v, context); First::unmarshal(instance, v, context);
((Members::unmarshal(instance, v, context)), ...); ((Members::unmarshal(instance, v, context)), ...);
if constexpr (has_validator<T>::value) {
instance.validate(context);
}
} }
static static