bevy_reflect: Unique `Reflect` #56

nicopap · 2022-05-20T06:35:14Z

create a new trait: PartialReflect
Reflect: PartialReflect
All methods on Reflect that does not depend on the uniqueness of the
underlying type are moved to PartialReflect
Most things should now accept a dyn PartialReflect rather than
dyn Reflect.
It is possible to convert a PartialReflect into a Reflect using a
into_full method.
FromReflect becomes FromPartialReflect.

Unresolved questions

CanonReflect name? ⇒ Went with Reflect and PartialReflect
CanonReflect or ReflectProxy? Remove all underlying-dependent methods from
Reflect and adding them to a new trait, or keep the underlying-dependent
methods but moved all the non-dependent methods to a new trait. Which one to
go with? ⇒ Went with a bit of both.
Implementation (partial: reflect: implement the unique reflect rfc bevy#7207)
Consider making more things Reflect.
Is a TypeRegistry entry for FromPartialReflect necessary? (no, as per partial implementation)

MrGVSV

This is really great! I think you hit the nail on the head with one of reflection's biggest footguns right now: guarantees that a dyn Reflect is actually the type you think it is.

Using something like ReflectProxy, I think the API will just be a lot safer and easier to use. This involves a bit more work on the users' end (more passing around of the TypeRegistry), but overall I think it's pretty worth it.

Good work!

MrGVSV · 2022-05-20T06:57:52Z

rfcs/56-better-reflect.md

+`constructor` can be derived similarly to `TypeInfo`. It will however
+require additional consuming methods on `Dynamic***` structs in order to be
+able to move their `Box<dyn Reflect>` fields into the constructed data
+structure.


How would this work? For example, if I have the following code:

#[derive(Reflect)] struct MyReflectStruct { foo: i32, #[reflect(ignore)] bar: MyNonReflectStruct, }

Is it doing the same thing as FromReflect does currently where we require ignored fields be Default?

rfcs/56-better-reflect.md

MrGVSV · 2022-05-20T07:02:23Z

rfcs/56-better-reflect.md

+think it introduces much more issues than it solves. The only use-case for
+`Dynamic***` being `Reflect` are the `reflect_mut`, `reflect_ref` and `apply`
+methods. However, those could as well be implemented outside of the `Reflect`


I'd argue that the actual biggest use-case for them is deserialization. Since we can't guarantee that all types implement FromReflect we're forced to return a Dynamic***.

MrGVSV · 2022-05-20T07:03:53Z

rfcs/56-better-reflect.md

+
+## Unresolved questions
+
+- How does this interact with `#[reflect(ignore)]`?


From what I gather, it really just encapsulates what FromReflect did. I imagine we'll have to do a similar thing. The tricky part is handling stuff beyond just Default, such as FromWorld.

rfcs/56-better-reflect.md

bjorn3 · 2022-05-20T14:47:03Z

rfcs/56-better-reflect.md

+* `Reflect` maps 1-to-1 with an underlying type meaning that if a
+  `Box<dyn Reflect>` cannot be downcasted to `T`, you cannot build a `T` from
+  it.


Won't that prevent Reflect from working for non-rust types like in case of scripting?

Could you elaborate. How do you use a non-rust type in rust? Wouldn't it need a conversion at one point?

The idea would be that you have for example a PyObject which is how any python object is internally represented and then it's Reflect implementation would present a different type depending on the type the PyObject has on the python side. For example for

class Foo(object): __slots__ = ('a', 'b') class Bar(object): __slots__ = ('c', 'd')

a PyObject holding a Foo would present the fields a and b, while a PyObject holding a Bar would present the fields c and d and a PyObject holding an array would present itself as an array through Reflect.

But this only exists on the Python side, right? What would this map to in Rust currently if there's no matching struct? A DynamicStruct?

It doesn't need to map to a rust type I think. downcast could return None for any type you attempt to downcast to. type_name would give the python name. It shouldn't map to DynamicStruct as that would lose the python type.

That would work, but it would have the exact same issue as what the Dynamic* types have right now in that the downcasted type doesn't match the semantic type that determines the layout which .reflect() gives.

Yeah I think I get the issue here. What about the proposition of moving reflect_ref and reflect_mut to their own trait independent from Reflect (call it the Bavy trait) and also move all the Reflect subtraits to Bavy? You could then implement Bavy for PyObject (or a wrapper type, per orphan rule). Maybe also move the sidecast proposition and implement Bavy for ReflectProxy?

I would rather go the opposite way and move all methods except reflect_ref and reflect_mut into separate traits as not every type may have an implementation for them and reflect_ref and reflect_mut are the core reflection api.

@bjorn3 I think this is a good idea. Maybe I could revise this RFC to have a UniqueReflect vs Reflect?

why would you want to reuse Reflect as a trait for this as opposed to writing specific code for Python? what's the use case? I thought Reflect as a trait is supposed to model how you can represent data in Rust, not in any language ever.

colepoirier · 2022-06-05T19:17:44Z

palliate

@nicopap could you clarify this by using a simpler word than “palliate”?

rfcs/56-better-reflect.md

PROMETHIA-27 · 2022-06-17T13:06:40Z

rfcs/56-better-reflect.md

+- Users cannot define their own proxy type, they must use the `Dynamic***`
+  types.
+- `Dynamic***` do not implement the `Reflect` subtraits anymore.
+- There is some added complexity (although it fixes what I believe to be a


I don't think this adds complexity so much as points it out; which makes it easier to deal with that complexity by modelling it more accurately.

rfcs/56-better-reflect.md

MrGVSV · 2022-06-18T22:39:24Z

rfcs/56-better-reflect.md

+Note that the various `Dynamic***` types shouldn't implement `CanonReflect`,
+only `Reflect`.


This fact should probably be a lot more prominent, since it's the basis for this RFC.

rfcs/56-better-reflect.md

nicopap · 2022-06-19T06:34:34Z

Next revision:

CanonReflect, Reflect ⇒ Reflect, PartialReflect
add into_canon to PartialReflect
Remove FromReflect change (though it will be renamed FromPartialReflect)

This allows us to remove the hard-requirement on `FromReflect` for everything, and also makes the conversion from `Reflect` to `CanonReflect` less compute-intensive.

By community consensus, `CanonReflect` is now `Reflect` and "old" `Reflect` is now `PartialReflect`. Since we "keep" `Reflect`, I reformulate the change to conceptually fit with the current reference frame. I also explain in more details the concepts `Reflect` represent and make clear what the true underlying source of the awkwardness of `Reflect` is.

MrGVSV

Really liking the direction this is heading :D

rfcs/56-better-reflect.md

MrGVSV · 2022-06-19T15:43:54Z

rfcs/56-better-reflect.md

+- Should `Reflect` still be named `Reflect`, does it need to be a subtrait of
+  `PartialReflect`?


Yeah I think it should definitely be a subtrait. Because then easily have access to all PartialReflect methods. Plus, it forces manual implementors to implement both, which might be necessary for certain reflect-based functionality (e.g. third-party crate assumptions).

rfcs/56-better-reflect.md

afonsolage · 2022-09-10T22:39:52Z

Nice! Just wanted to note that another advantage of using PartialReflect is that it will be possible to optimize the serde format by not serializing default values.

This will be very useful for scenes and networking

jakobhellermann

I'm a big fan of this RFC, it nicely separates these different concerns of Reflect and makes it much less error-prone to work with.

jakobhellermann · 2022-09-24T15:40:26Z

rfcs/56-better-reflect.md

+We still probably want a way to convert from a `PartialReflect` to a `Reflect`,
+so we add a `into_full` method to `PartialReflect` to convert them into
+`Reflect` in cases where the underlying type is canonical.


Just so I am sure, into_full on a proxy type will always return None, right?
It only returns Some if the dyn PartialReflect has an underlying type T: Reflect.

Reading futher confirms that this is true.

Yeah I think that's the idea. To convert a proxy, you'll still need to use FromPartialReflect like you do now with FromReflect.

jakobhellermann · 2022-09-24T16:01:10Z

rfcs/56-better-reflect.md

+    fn as_full(&self) -> Option<&dyn Reflect>;
+    fn into_full(self: Box<Self>) -> Option<Box<dyn Reflect>>;
+
+    fn type_name(&self) -> &str;


Do we still want to tie PartialReflect to a type name?
I can think of a few situations where this isn't necessary/wanted.

someone wants to bulk-edit a bunch of values, possible of different types. These types share fields a and b.
The person can then create a DynamicStruct with the shared types and apply it to every value.

implementing PartialReflect for non-rust values, e.g. a scripting language integration can implement PartialReflect for LuaValue

Mentioned this on Discord, but essentially type_name still has a use for deserialization.

However, for Point 2 I think you could intentionally use a non-real type name and be fine. As long as you aren't hoping to deserialize it (unless you #[reflect(Deserialize)]), I think it should be okay.

rfcs/56-better-reflect.md

jakobhellermann · 2022-09-24T16:22:36Z

rfcs/56-better-reflect.md

+    fn reflect_ref(&self) -> ReflectRef;
+    fn reflect_mut(&mut self) -> ReflectMut;


One piece of information that this restructuring loses is that reflect_ref on a &dyn Reflect will only contain &dyn Reflect itself, no &dyn PartialReflect.

So you may have to call into_full().unwrap() in a few places where you know the value originates from a &dyn Reflect.

let value: &dyn Reflect = &Time::default(); match value.reflect_ref() { ReflectRef::Struct(strukt) => { let field = strukt.field("last_update"); // field.downcast() doesn't exist // infallible unwrap field.into_full().unwrap().downcast::<Instant>(); }, _ => unreachable!(), }

The alternative is duplicating the ReflectRef, ReflectMut, Struct, List, Enum etc. for variants that preserve &dyn Reflect which is IMO not worth it.

Just pointing it out.

Regarding this, bevyengine/bevy#7207 does store &dyn PartialReflect in proxies and leaves PartialReflect: Any. I think it will require a different vision on ReflectRef and proxies to complete the RFC and have a proper separation between proxy and canonical types.

rfcs/56-better-reflect.md

bjorn3 · 2023-01-18T13:45:15Z

rfcs/56-better-reflect.md

+pub trait Reflect: PartialReflect + Any {
+    fn as_reflect(&self) -> &dyn Reflect;
+    fn as_reflect_mut(&mut self) -> &mut dyn Reflect;
+


I think this needs methods to turn it back into PartialReflect. At least until trait upcasting is stabilized.

As trait upcasting is not merged, it means I could give those methods the same name as the ones on PartialReflect?

Such as:

fn as_partial_reflect(&self) -> &dyn PartialReflect

fn as_partial_reflect_mut(&mut self) -> &mut dyn PartialReflect

Hang on, it might actually be possible to call those methods of PartialReflect on an Box<dyn Reflect> already.

it is possible. bevyengine/bevy#7207 uses this.

rfcs/56-better-reflect.md

# Objective > This PR is based on discussion from #6601 The Dynamic types (e.g. `DynamicStruct`, `DynamicList`, etc.) act as both: 1. Dynamic containers which may hold any arbitrary data 2. Proxy types which may represent any other type Currently, the only way we can represent the proxy-ness of a Dynamic is by giving it a name. ```rust // This is just a dynamic container let mut data = DynamicStruct::default(); // This is a "proxy" data.set_name(std::any::type_name::<Foo>()); ``` This type name is the only way we check that the given Dynamic is a proxy of some other type. When we need to "assert the type" of a `dyn Reflect`, we call `Reflect::type_name` on it. However, because we're only using a string to denote the type, we run into a few gotchas and limitations. For example, hashing a Dynamic proxy may work differently than the type it proxies: ```rust #[derive(Reflect, Hash)] #[reflect(Hash)] struct Foo(i32); let concrete = Foo(123); let dynamic = concrete.clone_dynamic(); let concrete_hash = concrete.reflect_hash(); let dynamic_hash = dynamic.reflect_hash(); // The hashes are not equal because `concrete` uses its own `Hash` impl // while `dynamic` uses a reflection-based hashing algorithm assert_ne!(concrete_hash, dynamic_hash); ``` Because the Dynamic proxy only knows about the name of the type, it's unaware of any other information about it. This means it also differs on `Reflect::reflect_partial_eq`, and may include ignored or skipped fields in places the concrete type wouldn't. ## Solution Rather than having Dynamics pass along just the type name of proxied types, we can instead have them pass around the `TypeInfo`. Now all Dynamic types contain an `Option<&'static TypeInfo>` rather than a `String`: ```diff pub struct DynamicTupleStruct { - type_name: String, + represented_type: Option<&'static TypeInfo>, fields: Vec<Box<dyn Reflect>>, } ``` By changing `Reflect::get_type_info` to `Reflect::represented_type_info`, hopefully we make this behavior a little clearer. And to account for `None` values on these dynamic types, `Reflect::represented_type_info` now returns `Option<&'static TypeInfo>`. ```rust let mut data = DynamicTupleStruct::default(); // Not proxying any specific type assert!(dyn_tuple_struct.represented_type_info().is_none()); let type_info = <Foo as Typed>::type_info(); dyn_tuple_struct.set_represented_type(Some(type_info)); // Alternatively: // let dyn_tuple_struct = foo.clone_dynamic(); // Now we're proxying `Foo` assert!(dyn_tuple_struct.represented_type_info().is_some()); ``` This means that we can have full access to all the static type information for the proxied type. Future work would include transitioning more static type information (trait impls, attributes, etc.) over to the `TypeInfo` so it can actually be utilized by Dynamic proxies. ### Alternatives & Rationale > **Note** > These alternatives were written when this PR was first made using a `Proxy` trait. This trait has since been removed. <details> <summary>View</summary> #### Alternative: The `Proxy<T>` Approach I had considered adding something like a `Proxy<T>` type where `T` would be the Dynamic and would contain the proxied type information. This was nice in that it allows us to explicitly determine whether something is a proxy or not at a type level. `Proxy<DynamicStruct>` proxies a struct. Makes sense. The reason I didn't go with this approach is because (1) tuples, (2) complexity, and (3) `PartialReflect`. The `DynamicTuple` struct allows us to represent tuples at runtime. It also allows us to do something you normally can't with tuples: add new fields. Because of this, adding a field immediately invalidates the proxy (e.g. our info for `(i32, i32)` doesn't apply to `(i32, i32, NewField)`). By going with this PR's approach, we can just remove the type info on `DynamicTuple` when that happens. However, with the `Proxy<T>` approach, it becomes difficult to represent this behavior— we'd have to completely control how we access data for `T` for each `T`. Secondly, it introduces some added complexities (aside from the manual impls for each `T`). Does `Proxy<T>` impl `Reflect`? Likely yes, if we want to represent it as `dyn Reflect`. What `TypeInfo` do we give it? How would we forward reflection methods to the inner type (remember, we don't have specialization)? How do we separate this from Dynamic types? And finally, how do all this in a way that's both logical and intuitive for users? Lastly, introducing a `Proxy` trait rather than a `Proxy<T>` struct is actually more inline with the [Unique Reflect RFC](bevyengine/rfcs#56). In a way, the `Proxy` trait is really one part of the `PartialReflect` trait introduced in that RFC (it's technically not in that RFC but it fits well with it), where the `PartialReflect` serves as a way for proxies to work _like_ concrete types without having full access to everything a concrete `Reflect` type can do. This would help bridge the gap between the current state of the crate and the implementation of that RFC. All that said, this is still a viable solution. If the community believes this is the better path forward, then we can do that instead. These were just my reasons for not initially going with it in this PR. #### Alternative: The Type Registry Approach The `Proxy` trait is great and all, but how does it solve the original problem? Well, it doesn't— yet! The goal would be to start moving information from the derive macro and its attributes to the generated `TypeInfo` since these are known statically and shouldn't change. For example, adding `ignored: bool` to `[Un]NamedField` or a list of impls. However, there is another way of storing this information. This is, of course, one of the uses of the `TypeRegistry`. If we're worried about Dynamic proxies not aligning with their concrete counterparts, we could move more type information to the registry and require its usage. For example, we could replace `Reflect::reflect_hash(&self)` with `Reflect::reflect_hash(&self, registry: &TypeRegistry)`. That's not the _worst_ thing in the world, but it is an ergonomics loss. Additionally, other attributes may have their own requirements, further restricting what's possible without the registry. The `Reflect::apply` method will require the registry as well now. Why? Well because the `map_apply` function used for the `Reflect::apply` impls on `Map` types depends on `Map::insert_boxed`, which (at least for `DynamicMap`) requires `Reflect::reflect_hash`. The same would apply when adding support for reflection-based diffing, which will require `Reflect::reflect_partial_eq`. Again, this is a totally viable alternative. I just chose not to go with it for the reasons above. If we want to go with it, then we can close this PR and we can pursue this alternative instead. #### Downsides Just to highlight a quick potential downside (likely needs more investigation): retrieving the `TypeInfo` requires acquiring a lock on the `GenericTypeInfoCell` used by the `Typed` impls for generic types (non-generic types use a `OnceBox which should be faster). I am not sure how much of a performance hit that is and will need to run some benchmarks to compare against. </details> ### Open Questions 1. Should we use `Cow<'static, TypeInfo>` instead? I think that might be easier for modding? Perhaps, in that case, we need to update `Typed::type_info` and friends as well? 2. Are the alternatives better than the approach this PR takes? Are there other alternatives? --- ## Changelog ### Changed - `Reflect::get_type_info` has been renamed to `Reflect::represented_type_info` - This method now returns `Option<&'static TypeInfo>` rather than just `&'static TypeInfo` ### Added - Added `Reflect::is_dynamic` method to indicate when a type is dynamic - Added a `set_represented_type` method on all dynamic types ### Removed - Removed `TypeInfo::Dynamic` (use `Reflect::is_dynamic` instead) - Removed `Typed` impls for all dynamic types ## Migration Guide - The Dynamic types no longer take a string type name. Instead, they require a static reference to `TypeInfo`: ```rust #[derive(Reflect)] struct MyTupleStruct(f32, f32); let mut dyn_tuple_struct = DynamicTupleStruct::default(); dyn_tuple_struct.insert(1.23_f32); dyn_tuple_struct.insert(3.21_f32); // BEFORE: let type_name = std::any::type_name::<MyTupleStruct>(); dyn_tuple_struct.set_name(type_name); // AFTER: let type_info = <MyTupleStruct as Typed>::type_info(); dyn_tuple_struct.set_represented_type(Some(type_info)); ``` - `Reflect::get_type_info` has been renamed to `Reflect::represented_type_info` and now also returns an `Option<&'static TypeInfo>` (instead of just `&'static TypeInfo`): ```rust // BEFORE: let info: &'static TypeInfo = value.get_type_info(); // AFTER: let info: &'static TypeInfo = value.represented_type_info().unwrap(); ``` - `TypeInfo::Dynamic` and `DynamicInfo` has been removed. Use `Reflect::is_dynamic` instead: ```rust // BEFORE: if matches!(value.get_type_info(), TypeInfo::Dynamic) { // ... } // AFTER: if value.is_dynamic() { // ... } ``` --------- Co-authored-by: radiish <cb.setho@gmail.com>

MrGVSV · 2024-11-22T21:27:04Z

This can be merged since it's since been implemented in bevyengine/bevy#7207

Add Reflect API changes proposition

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nicopap marked this pull request as draft June 1, 2022 14:01

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[Merged by Bors] - Make Reflect safe to implement bevyengine/bevy#5010

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Start drafting CanonReflect

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Finish CanonReflect rework

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nicopap added 2 commits June 19, 2022 09:39

Replace make_canon with into_full

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This allows us to remove the hard-requirement on `FromReflect` for everything, and also makes the conversion from `Reflect` to `CanonReflect` less compute-intensive.

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Add back 'pass for' jargo entry

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[Merged by Bors] - bevy_reflect: Reflect enums bevyengine/bevy#4761

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bevy_reflect: Improve serialization format bevyengine/bevy#4561

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bevy_reflect: Recursive registration bevyengine/bevy#5781

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bevy_reflect: Convert dynamic types to concrete instances bevyengine/bevy#4597

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bevy_reflect: Better proxies bevyengine/bevy#6971

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Integrate bjorn3 suggestions

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bevy_reflect: FromReflect Ergonomics Implementation bevyengine/bevy#6056

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Add release note for Unique Reflect bevyengine/bevy-website#1837

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		## Unresolved questions

		- How does this interact with `#[reflect(ignore)]`?

		Note that the various `Dynamic***` types shouldn't implement `CanonReflect`,
		only `Reflect`.

		- Should `Reflect` still be named `Reflect`, does it need to be a subtrait of
		`PartialReflect`?

		fn reflect_ref(&self) -> ReflectRef;
		fn reflect_mut(&mut self) -> ReflectMut;

bevy_reflect: Unique Reflect #56

bevy_reflect: Unique Reflect #56

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bevy_reflect: Unique `Reflect` #56

bevy_reflect: Unique `Reflect` #56

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