Struct HostBridge 

pub struct HostBridge(/* private fields */);

Rust-side bridge function callable from Lua.

Inputs and outputs are both serde_json::Value (i.e. JSON). Lua invokes it as host.<name>(arg_table). If the implementation needs to call async Rust, the caller does the sync-ification (typically tokio::runtime::Handle::current().block_on(...)).

Design intent: keep Lua scripts focused on flow control and ctx walking, while the heavy lifting (LLM calls, RFC 6902 apply, verifiers, and so on) stays on the Rust side. Going “pure Lua” — removing the bridge — is a carry.

Implementations

impl HostBridge

pub fn new<F>(f: F) -> Self

where F: Fn(Value) -> Result<Value, String> + Send + Sync + 'static,

Wrap a Rust closure as a bridge callable from Lua.

pub fn call(&self, arg: Value) -> Result<Value, String>

Invoke the bridge directly — a thin trampoline over the inner Fn. The production path goes through the Lua runtime, but this stays pub so unit tests can exercise the primitive directly.

Trait Implementations

impl Clone for HostBridge

fn clone(&self) -> HostBridge

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.