databendlabs / openraft / 20536767782

88%

Build Type

push

github

Committed by drmingdrmer

Commit Message

feat: add `Extensions` type-map for user-defined data storage

Add a flexible `Extensions` type-map that allows external crates to store
arbitrary types associated with a Raft instance, keyed by `TypeId`.

This follows the `http::Extensions` pattern, enabling multiple plugins to
store data independently without compile-time coordination.

Changes:
- Add `Extensions` struct in `openraft/src/extensions.rs`
- Add `Raft::extensions()` method returning `&Extensions`
- Values must implement `Clone` - `get()` returns cloned value to avoid deadlocks
- Use `Arc` for shared mutable state (e.g., `Arc<AtomicU64>`)

Usage:
```rust
#[derive(Clone)]
struct MyData(Arc<MyInner>);

raft.extensions().insert(MyData::default());
let data = raft.extensions().get::<MyData>().unwrap();
```

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