Struct ScriptProviderLayer 

pub struct ScriptProviderLayer { /* private fields */ }

Lazy, hot-reloading resolver for script providers.

Implementations

impl ScriptProviderLayer

pub fn new( dir: PathBuf, overrides: HashMap<String, ScriptProviderSpec>, default_caps: HashMap<String, ModelCapabilities>, request_timeout_secs: Option<u64>, env_allowlist: Vec<String>, ) -> Self

Build a layer over dir, with per-provider overrides, global model capability overrides, and the global request timeout.

pub fn get_or_load(&self, name: &str) -> Option<Arc<dyn Provider>>

Get (or lazily load / reload) the provider named name, or None when there is no such script or it fails to load.

The cache lock is taken three times - a read, then a write on whichever arm the compile lands on - and is never held across RhaiProvider::from_script, which parses and initializes an arbitrary user-authored .rhai file. That call is the slowest and least trustworthy thing this layer does; holding a process-wide lock across it serialized every agent’s provider lookup behind one compile, and a panic inside it poisoned the cache for the whole daemon.

The cost is that two callers racing on the same cold name may both compile it. Both get a working provider and the later insert wins - wasted work, never a wrong answer, and it self-corrects on the next lookup because entries are validated by mtime.