Struct tower::util::Optional

pub struct Optional<T> { /* private fields */ }

Optionally forwards requests to an inner service.

If the inner service is None, optional::None is returned as the response.

Implementations

impl<T> Optional<T>

pub const fn new<Request>(inner: Option<T>) -> Optional<T>

where T: Service<Request>, T::Error: Into<BoxError>,

Create a new Optional.

Trait Implementations

impl<T: Debug> Debug for Optional<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T, Request> Service<Request> for Optional<T>

where T: Service<Request>, T::Error: Into<BoxError>,

type Response = <T as Service<Request>>::Response

Responses given by the service.

type Error = Box<dyn Error + Send + Sync>

Errors produced by the service.

type Future = ResponseFuture<<T as Service<Request>>::Future>

The future response value.

fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>>

Returns Poll::Ready(Ok(())) when the service is able to process requests.

fn call(&mut self, request: Request) -> Self::Future

Process the request and return the response asynchronously.