Chain

roa_core

Struct Chain 

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pub struct Chain<T, U>(/* private fields */);
Expand description

A middleware composing and executing other middlewares in a stack-like manner.

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impl<'a, S, T, U> Endpoint<'a, S> for Chain<T, U>
where U: Endpoint<'a, S>, T: for<'b> Middleware<'b, S>,

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fn call<'async_trait>( &'a self, ctx: &'a mut Context<S>, ) -> Pin<Box<dyn Future<Output = Result> + 'async_trait>>
where Self: 'async_trait, 'a: 'async_trait,

Call this endpoint.
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impl<'a, S, T, U> Middleware<'a, S> for Chain<T, U>
where U: Middleware<'a, S>, T: for<'b> Middleware<'b, S>,

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fn handle<'async_trait>( &'a self, ctx: &'a mut Context<S>, next: Next<'a>, ) -> Pin<Box<dyn Future<Output = Result> + 'async_trait>>
where Self: 'async_trait, 'a: 'async_trait,

Handle context and next, return status.

Auto Trait Implementations§

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impl<T, U> Freeze for Chain<T, U>
where T: Freeze, U: Freeze,

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impl<T, U> RefUnwindSafe for Chain<T, U>
where T: RefUnwindSafe, U: RefUnwindSafe,

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impl<T, U> Send for Chain<T, U>
where T: Send, U: Send,

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impl<T, U> Sync for Chain<T, U>
where T: Sync, U: Sync,

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impl<T, U> Unpin for Chain<T, U>
where T: Unpin, U: Unpin,

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impl<T, U> UnwindSafe for Chain<T, U>
where T: UnwindSafe, U: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<S, T> EndpointExt<S> for T
where T: for<'a> Endpoint<'a, S>,

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fn boxed(self) -> Boxed<S>
where S: 'static,

Box an endpoint.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<S, T> MiddlewareExt<S> for T
where T: for<'a> Middleware<'a, S>,

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fn chain<M>(self, next: M) -> Chain<Self, M>
where M: for<'a> Middleware<'a, S>,

Chain two middlewares.
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fn end<E>(self, next: E) -> Chain<Self, E>
where E: for<'a> Endpoint<'a, S>,

Chain an endpoint to a middleware.
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fn shared(self) -> Shared<S>
where S: 'static,

Make middleware shared.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more