tower-util 0.1.0

Utilities for working with `Service`. 
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use tower_layer::Layer;

/// Two middlewares chained together.
///
/// This type is produced by `Layer::chain`.
#[derive(Clone, Debug)]
pub struct Stack<Inner, Outer> {
    inner: Inner,
    outer: Outer,
}

impl<Inner, Outer> Stack<Inner, Outer> {
    /// Create a new `Stack`.
    pub fn new(inner: Inner, outer: Outer) -> Self {
        Stack { inner, outer }
    }
}

impl<S, Inner, Outer> Layer<S> for Stack<Inner, Outer>
where
    Inner: Layer<S>,
    Outer: Layer<Inner::Service>,
{
    type Service = Outer::Service;

    fn layer(&self, service: S) -> Self::Service {
        let inner = self.inner.layer(service);

        self.outer.layer(inner)
    }
}