Trait tower::Layer

pub trait Layer<S> {
    type Service;

    // Required method
    fn layer(&self, inner: S) -> Self::Service;
}

Decorates a Service, transforming either the request or the response.

Often, many of the pieces needed for writing network applications can be reused across multiple services. The Layer trait can be used to write reusable components that can be applied to very different kinds of services; for example, it can be applied to services operating on different protocols, and to both the client and server side of a network transaction.

Log

Take request logging as an example:

pub struct LogLayer {
    target: &'static str,
}

impl<S> Layer<S> for LogLayer {
    type Service = LogService<S>;

    fn layer(&self, service: S) -> Self::Service {
        LogService {
            target: self.target,
            service
        }
    }
}

// This service implements the Log behavior
pub struct LogService<S> {
    target: &'static str,
    service: S,
}

impl<S, Request> Service<Request> for LogService<S>
where
    S: Service<Request>,
    Request: fmt::Debug,
{
    type Response = S::Response;
    type Error = S::Error;
    type Future = S::Future;

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

    fn call(&mut self, request: Request) -> Self::Future {
        // Insert log statement here or other functionality
        println!("request = {:?}, target = {:?}", request, self.target);
        self.service.call(request)
    }
}

The above log implementation is decoupled from the underlying protocol and is also decoupled from client or server concerns. In other words, the same log middleware could be used in either a client or a server.

Required Associated Types

type Service

The wrapped service

Required Methods

fn layer(&self, inner: S) -> Self::Service

Wrap the given service with the middleware, returning a new service that has been decorated with the middleware.

Implementations on Foreign Types

impl<'a, T, S> Layer<S> for &'a T

where T: Layer<S> + ?Sized,

type Service = <T as Layer<S>>::Service

fn layer(&self, inner: S) -> <&'a T as Layer<S>>::Service

impl<S> Layer<S> for ()

type Service = S

fn layer(&self, service: S) -> <() as Layer<S>>::Service

impl<S, L1> Layer<S> for (L1,)

where L1: Layer<S>,

type Service = <L1 as Layer<S>>::Service

fn layer(&self, service: S) -> <(L1,) as Layer<S>>::Service

impl<S, L1, L2> Layer<S> for (L1, L2)

where L1: Layer<<L2 as Layer<S>>::Service>, L2: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<S>>::Service>>::Service

fn layer(&self, service: S) -> <(L1, L2) as Layer<S>>::Service

impl<S, L1, L2, L3> Layer<S> for (L1, L2, L3)

where L1: Layer<<L2 as Layer<<L3 as Layer<S>>::Service>>::Service>, L2: Layer<<L3 as Layer<S>>::Service>, L3: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<S>>::Service>>::Service>>::Service

fn layer(&self, service: S) -> <(L1, L2, L3) as Layer<S>>::Service

impl<S, L1, L2, L3, L4> Layer<S> for (L1, L2, L3, L4)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<S>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<S>>::Service>>::Service>, L3: Layer<<L4 as Layer<S>>::Service>, L4: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<S>>::Service>>::Service>>::Service>>::Service

fn layer(&self, service: S) -> <(L1, L2, L3, L4) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5> Layer<S> for (L1, L2, L3, L4, L5)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<S>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<S>>::Service>>::Service>, L4: Layer<<L5 as Layer<S>>::Service>, L5: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer(&self, service: S) -> <(L1, L2, L3, L4, L5) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6> Layer<S> for (L1, L2, L3, L4, L5, L6)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<S>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<S>>::Service>>::Service>, L5: Layer<<L6 as Layer<S>>::Service>, L6: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer(&self, service: S) -> <(L1, L2, L3, L4, L5, L6) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7> Layer<S> for (L1, L2, L3, L4, L5, L6, L7)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<S>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<S>>::Service>>::Service>, L6: Layer<<L7 as Layer<S>>::Service>, L7: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<S>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<S>>::Service>>::Service>, L7: Layer<<L8 as Layer<S>>::Service>, L8: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>, L8: Layer<<L9 as Layer<S>>::Service>, L9: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>, L8: Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>, L9: Layer<<L10 as Layer<S>>::Service>, L10: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9, L10) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L8: Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>, L9: Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>, L10: Layer<<L11 as Layer<S>>::Service>, L11: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L8: Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L9: Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>, L10: Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>, L11: Layer<<L12 as Layer<S>>::Service>, L12: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L8: Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L9: Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L10: Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>, L11: Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>, L12: Layer<<L13 as Layer<S>>::Service>, L13: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L8: Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L9: Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L10: Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L11: Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>, L12: Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>, L13: Layer<<L14 as Layer<S>>::Service>, L14: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L8: Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L9: Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L10: Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L11: Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L12: Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>, L13: Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>, L14: Layer<<L15 as Layer<S>>::Service>, L15: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15) as Layer<S>>::Service

impl<S, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15, L16> Layer<S> for (L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15, L16)

where L1: Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L2: Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L3: Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L4: Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L5: Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L6: Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L7: Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L8: Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L9: Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L10: Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>, L11: Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>, L12: Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>, L13: Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>, L14: Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>, L15: Layer<<L16 as Layer<S>>::Service>, L16: Layer<S>,

type Service = <L1 as Layer<<L2 as Layer<<L3 as Layer<<L4 as Layer<<L5 as Layer<<L6 as Layer<<L7 as Layer<<L8 as Layer<<L9 as Layer<<L10 as Layer<<L11 as Layer<<L12 as Layer<<L13 as Layer<<L14 as Layer<<L15 as Layer<<L16 as Layer<S>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service>>::Service

fn layer( &self, service: S, ) -> <(L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15, L16) as Layer<S>>::Service

Implementors

impl<F, S, Out> Layer<S> for LayerFn<F>

where F: Fn(S) -> Out,

type Service = Out

impl<In, T, U, E> Layer<In> for BoxCloneServiceLayer<In, T, U, E>

Available on crate feature util only.

type Service = BoxCloneService<T, U, E>

impl<In, T, U, E> Layer<In> for BoxLayer<In, T, U, E>

Available on crate feature util only.

type Service = BoxService<T, U, E>

impl<P, S> Layer<S> for RetryLayer<P>

where P: Clone,

Available on crate feature retry only.

type Service = Retry<P, S>

impl<S> Layer<S> for Identity

Decorates a Service, transforming either the request or the response.

type Service = S

impl<S> Layer<S> for ConcurrencyLimitLayer

Available on crate feature limit only.

type Service = ConcurrencyLimit<S>

impl<S> Layer<S> for GlobalConcurrencyLimitLayer

Available on crate feature limit only.

type Service = ConcurrencyLimit<S>

impl<S> Layer<S> for RateLimitLayer

Available on crate feature limit only.

type Service = RateLimit<S>

impl<S> Layer<S> for LoadShedLayer

Available on crate feature load-shed only.

type Service = LoadShed<S>

impl<S> Layer<S> for SpawnReadyLayer

Available on crate feature spawn-ready only.

type Service = SpawnReady<S>

impl<S> Layer<S> for TimeoutLayer

Available on crate feature timeout only.

type Service = Timeout<S>

impl<S, A, B> Layer<S> for Either<A, B>

where A: Layer<S>, B: Layer<S>,

Available on crate feature util only.

type Service = Either<<A as Layer<S>>::Service, <B as Layer<S>>::Service>

impl<S, F> Layer<S> for AndThenLayer<F>

where F: Clone,

Available on crate feature util only.

type Service = AndThen<S, F>

impl<S, F> Layer<S> for MapErrLayer<F>

where F: Clone,

Available on crate feature util only.

type Service = MapErr<S, F>

impl<S, F> Layer<S> for MapFutureLayer<F>

where F: Clone,

Available on crate feature util only.

type Service = MapFuture<S, F>

impl<S, F> Layer<S> for MapRequestLayer<F>

where F: Clone,

Available on crate feature util only.

type Service = MapRequest<S, F>

impl<S, F> Layer<S> for MapResponseLayer<F>

where F: Clone,

Available on crate feature util only.

type Service = MapResponse<S, F>

impl<S, F> Layer<S> for MapResultLayer<F>

where F: Clone,

Available on crate feature util only.

type Service = MapResult<S, F>

impl<S, F> Layer<S> for ThenLayer<F>

where F: Clone,

Available on crate feature util only.

type Service = Then<S, F>

impl<S, Inner, Outer> Layer<S> for Stack<Inner, Outer>

where Inner: Layer<S>, Outer: Layer<<Inner as Layer<S>>::Service>,

type Service = <Outer as Layer<<Inner as Layer<S>>::Service>>::Service

impl<S, L> Layer<S> for ServiceBuilder<L>

where L: Layer<S>,

type Service = <L as Layer<S>>::Service

impl<S, Req> Layer<S> for MakeBalanceLayer<S, Req>

Available on crate feature balance only.

type Service = MakeBalance<S, Req>

impl<S, Request> Layer<S> for BufferLayer<Request>

where S: Service<Request> + Send + 'static, S::Future: Send, S::Error: Into<BoxError> + Send + Sync, Request: Send + 'static,

Available on crate feature buffer only.

type Service = Buffer<Request, <S as Service<Request>>::Future>

impl<U: Clone, S> Layer<S> for AsyncFilterLayer<U>

Available on crate feature filter only.

type Service = AsyncFilter<S, U>

impl<U: Clone, S> Layer<S> for FilterLayer<U>

Available on crate feature filter only.

type Service = Filter<S, U>