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LibIPC: Support sending Variants over IPC
The format is quite simply the type index followed by the type in its own native encoding; just implementing the receive side with static typing is a bit convoluted. The only limitation of this implementation is that the variant type has to contain an Empty somewhere as it is not default constructible otherwise. Co-authored-by: Ali Mohammad Pur <mpfard@serenityos.org>
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@ -12,6 +12,8 @@
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#include <AK/NumericLimits.h>
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#include <AK/StdLibExtras.h>
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#include <AK/Try.h>
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#include <AK/TypeList.h>
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#include <AK/Variant.h>
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#include <LibCore/SharedCircularQueue.h>
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#include <LibCore/Stream.h>
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#include <LibIPC/File.h>
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@ -53,6 +55,7 @@ public:
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ErrorOr<void> decode(URL&);
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ErrorOr<void> decode(Dictionary&);
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ErrorOr<void> decode(File&);
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ErrorOr<void> decode(AK::Empty&);
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template<typename K, typename V>
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ErrorOr<void> decode(HashMap<K, V>& hashmap)
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{
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@ -133,6 +136,18 @@ public:
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return {};
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}
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template<typename... VariantTypes>
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ErrorOr<void> decode(Variant<VariantTypes...>& variant)
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{
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typename AK::Variant<VariantTypes...>::IndexType type_index;
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TRY(decode(type_index));
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if (type_index >= sizeof...(VariantTypes))
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return Error::from_string_literal("IPC: Invalid variant index");
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TRY((decode_variant<0, sizeof...(VariantTypes), VariantTypes...>(type_index, variant)));
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return {};
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}
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template<typename T>
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ErrorOr<void> decode(Optional<T>& optional)
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{
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@ -149,6 +164,22 @@ public:
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}
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private:
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template<size_t CurrentIndex, size_t Max, typename... VariantTypes>
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ErrorOr<void> decode_variant(size_t index, Variant<VariantTypes...>& variant)
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{
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if constexpr (CurrentIndex < Max) {
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if (index == CurrentIndex) {
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typename TypeList<VariantTypes...>::template Type<CurrentIndex> element;
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TRY(decode(element));
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variant.set(move(element));
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return {};
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}
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return decode_variant<CurrentIndex + 1, Max, VariantTypes...>(index, variant);
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} else {
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VERIFY_NOT_REACHED();
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}
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}
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InputMemoryStream& m_stream;
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Core::Stream::LocalSocket& m_socket;
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};
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