Trait LayerSource 

pub trait LayerSource:
    Debug
    + Send
    + Sync {
    // Required methods
    fn fetch_layer<'a>(
        &'a self,
        manifest: &'a ImageManifest,
        layer: &'a Descriptor,
        progress: Option<&'a Sender<Option<LayerProgress>>>,
    ) -> BoxFuture<'a, Result<FetchedLayer<'a>>>;
    fn finish(self: Box<Self>) -> BoxFuture<'static, Result<()>>;
}

Abstraction for layer blob data.

Typically ProxyLayerSource which pulls from a registry, but for deltas we reconstruct data directly from the delta.

Required Methods

fn fetch_layer<'a>( &'a self, manifest: &'a ImageManifest, layer: &'a Descriptor, progress: Option<&'a Sender<Option<LayerProgress>>>, ) -> BoxFuture<'a, Result<FetchedLayer<'a>>>

Open one layer of manifest for reading.

fn finish(self: Box<Self>) -> BoxFuture<'static, Result<()>>

Release the source, at most once and after the last Self::fetch_layer.

This is only reached when the import succeeds; an import that fails part way through drops the source instead. Anything that must be cleaned up either way belongs in a Drop impl.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl LayerSource for ProxyLayerSource