Struct OptionService 

pub struct OptionService<M, S> { /* private fields */ }

A middleware for an optional layer with merged error types.

The tower::util::Either middleware converts errors to BoxError, which can make it difficult to return to a concrete error type. This middleware allows the inner service to return a concrete error type, while the optional middleware must return an error type that can be converted to the inner service’s error type.

Trait Implementations

impl<M: Clone, S: Clone> Clone for OptionService<M, S>

fn clone(&self) -> OptionService<M, S>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<M: Debug, S: Debug> Debug for OptionService<M, S>

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

Formats the value using the given formatter.

impl<M, S, Req, E> Service<Req> for OptionService<M, S>

where S: Service<Req, Error = E>, M: Service<Req, Response = S::Response>, M::Error: Into<E>,

type Response = <S as Service<Req>>::Response

Responses given by the service.

type Error = E

Errors produced by the service.

type Future = OptionServiceFuture<<M as Service<Req>>::Future, <S as Service<Req>>::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, req: Req) -> Self::Future

Process the request and return the response asynchronously.