Trait Fetcher 

pub trait Fetcher {
    type Key: Span;
    type Value;

    // Required method
    fn fetch(
        &self,
        key: Self::Key,
    ) -> impl Future<Output = Option<Self::Value>> + Send;
}

Fetches raw values for resolver keys.

Required Associated Types

type Key: Span

Key requested by the resolver.

type Value

Raw value delivered to the consumer for validation.

Required Methods

fn fetch( &self, key: Self::Key, ) -> impl Future<Output = Option<Self::Value>> + Send

Fetch the value for key.

Return None for transient failures, missing data, or unexpected source responses. The resolver will retry while the key still has retained subscribers.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors