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types: `AnyView` has none of `Any`'s type-URL helpers

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@farmer-data is already working on this.

Since Oct 17, 2026.

  • #734 by @farmer-data — open

Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
84/100
Issue type
Feature
Clarity
Clearly specified
Activity status
Active
Tech stack
rust
Domain
api

Research direction

Start in buffa-types/src/any_ext.rs: read how Any implements type_name, is_message, is_type, unpack_message and unpack_if, especially the documented split rule (text after the last /, no name for URLs without / or with an empty name). Then locate the generated AnyView<'a> definition and its decode_view entry point to see what its two borrowed fields offer. Done means AnyView exposes the same five helpers by sharing the split logic with Any::type_name, with tests covering the split edge cases and unpack decoding from the borrowed value; run the crate's test suite (cargo test) to confirm.

Written by the indexing model from the issue text.

Description

enhancement

Any has type_name(), is_message::<T>(), is_type(), unpack_message::<T>() and unpack_if() (buffa-types/src/any_ext.rs). The generated AnyView<'a> has only its two fields, type_url: &'a str and value: &'a [u8], so code that holds a decoded view repeats the URL split by hand or converts to an owned Any first:

let view = AnyView::decode_view(bytes)?;
// view.is_message::<Duration>() does not exist
let is_duration =
    view.type_url.rsplit_once('/').map(|(_, name)| name) == Some(Duration::FULL_NAME);

A view is what a zero-copy handler dispatches on, so the type test is the first thing it needs. The hand-written split also has to repeat the rule that Any::type_name documents: the name is the text after the last /, and a URL with no / or with an empty name has no type name.

Proposed: inherent type_name, is_message, is_type, unpack_message and unpack_if on AnyView, sharing the split with Any::type_name. They allocate only what the unpacked message needs: unpack_message decodes from the borrowed value.

Dominant language
Rust
Stars
927
Forks
119
Avg merge
3d 6h
Merged PRs (30d)
152

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