Type Alias FetchFn 

pub type FetchFn = Arc<dyn Fn(Name) -> Pin<Box<dyn Future<Output = Option<Data>> + Send>> + Send + Sync>;

Type alias for the async fetch callback.

The callback takes a certificate Name and returns Option<Data>. None means the fetch failed (timeout, no route, etc.).

Aliased Type

pub struct FetchFn { /* private fields */ }