Trait StateStore 

pub trait StateStore: Send + Sync {
    // Required methods
    fn read_state(&self, id: &str) -> Result<Option<Vec<u8>>>;
    fn write_state(&self, id: &str, value: &[u8]) -> Result<()>;
}

A pluggable key/value state store — the Rust analog of Go’s ipn.StateStore (Server::store).

Scope (be honest). Unlike Go — which persists the full node state (prefs + netmap + machine key) — this fork’s engine only persists node identity keys. So a StateStore here round-trips exactly one value: the PersistState identity blob under STATE_KEY. The trait is intentionally the general KV shape so it stays forward-compatible: when the engine grows prefs/netmap persistence, more keys slot in with no caller change. See the design doc.

Required Methods

fn read_state(&self, id: &str) -> Result<Option<Vec<u8>>>

Read the value for id, or Ok(None) if it has never been written.

fn write_state(&self, id: &str, value: &[u8]) -> Result<()>

Durably write value for id.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl StateStore for FileStore

impl StateStore for MemStore