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feat: Add Layered service to propagate NamedService implementation (#…
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Original file line number | Diff line number | Diff line change |
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use std::{ | ||
marker::PhantomData, | ||
task::{Context, Poll}, | ||
}; | ||
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use tower_layer::Layer; | ||
use tower_service::Service; | ||
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use crate::server::NamedService; | ||
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/// A layered service to propagate [`NamedService`] implementation. | ||
#[derive(Debug, Clone)] | ||
pub struct Layered<S, T> { | ||
inner: S, | ||
_ty: PhantomData<T>, | ||
} | ||
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impl<S, T: NamedService> NamedService for Layered<S, T> { | ||
const NAME: &'static str = T::NAME; | ||
} | ||
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impl<Req, S, T> Service<Req> for Layered<S, T> | ||
where | ||
S: Service<Req>, | ||
{ | ||
type Response = S::Response; | ||
type Error = S::Error; | ||
type Future = S::Future; | ||
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fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
self.inner.poll_ready(cx) | ||
} | ||
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fn call(&mut self, req: Req) -> Self::Future { | ||
self.inner.call(req) | ||
} | ||
} | ||
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/// Extension trait which adds utility methods to types which implement [`tower_layer::Layer`]. | ||
pub trait LayerExt<L>: sealed::Sealed { | ||
/// Applies the layer to a service and wraps it in [`Layered`]. | ||
fn named_layer<S>(&self, service: S) -> Layered<L::Service, S> | ||
where | ||
L: Layer<S>; | ||
} | ||
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impl<L> LayerExt<L> for L { | ||
fn named_layer<S>(&self, service: S) -> Layered<<L>::Service, S> | ||
where | ||
L: Layer<S>, | ||
{ | ||
Layered { | ||
inner: self.layer(service), | ||
_ty: PhantomData, | ||
} | ||
} | ||
} | ||
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mod sealed { | ||
pub trait Sealed {} | ||
impl<T> Sealed for T {} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use super::*; | ||
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#[derive(Debug, Default)] | ||
struct TestService {} | ||
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const TEST_SERVICE_NAME: &str = "test-service-name"; | ||
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impl NamedService for TestService { | ||
const NAME: &'static str = TEST_SERVICE_NAME; | ||
} | ||
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// Checks if the argument implements `NamedService` and returns the implemented `NAME`. | ||
fn get_name_of_named_service<S: NamedService>(_s: &S) -> &'static str { | ||
S::NAME | ||
} | ||
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#[test] | ||
fn named_service_is_propagated_to_layered() { | ||
use std::time::Duration; | ||
use tower::{limit::ConcurrencyLimitLayer, timeout::TimeoutLayer}; | ||
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let layered = TimeoutLayer::new(Duration::from_secs(5)).named_layer(TestService::default()); | ||
assert_eq!(get_name_of_named_service(&layered), TEST_SERVICE_NAME); | ||
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let layered = ConcurrencyLimitLayer::new(3).named_layer(layered); | ||
assert_eq!(get_name_of_named_service(&layered), TEST_SERVICE_NAME); | ||
} | ||
} |
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