Struct tower_util::Optional

[+] Show declaration

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

[−] Expand description

Optionally forwards requests to an inner service.

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

Implementations

impl<T> Optional<T>[−]

pub fn new<Request>(inner: Option<T>) -> Optional<T> where
    T: Service<Request>,
    T::Error: Into<Box<dyn Error + Send + Sync>>, [−]

Create a new OptionService

Trait Implementations

impl<T: Debug> Debug for Optional<T>[+]

[+] Show hidden undocumented items

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<Box<dyn Error + Send + Sync>>, [+]

[+] Show hidden undocumented items

type Response = T::Response

Responses given by the service.

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

Errors produced by the service.

type Future = ResponseFuture<T::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.