tower_http::classify

Struct SharedClassifier

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pub struct SharedClassifier<C> { /* private fields */ }
Expand description

A MakeClassifier that produces new classifiers by cloning an inner classifier.

When a type implementing ClassifyResponse doesn’t depend on information from the request, SharedClassifier can be used to turn an instance of that type into a MakeClassifier.

§Example

use std::fmt;
use tower_http::classify::{
    ClassifyResponse, ClassifiedResponse, NeverClassifyEos,
    SharedClassifier, MakeClassifier,
};
use http::Response;

// A response classifier that only considers errors to be failures.
#[derive(Clone, Copy)]
struct MyClassifier;

impl ClassifyResponse for MyClassifier {
    type FailureClass = String;
    type ClassifyEos = NeverClassifyEos<Self::FailureClass>;

    fn classify_response<B>(
        self,
        _res: &Response<B>,
    ) -> ClassifiedResponse<Self::FailureClass, Self::ClassifyEos> {
        ClassifiedResponse::Ready(Ok(()))
    }

    fn classify_error<E>(self, error: &E) -> Self::FailureClass
    where
        E: fmt::Display + 'static,
    {
        error.to_string()
    }
}

// Some function that requires a `MakeClassifier`
fn use_make_classifier<M: MakeClassifier>(make: M) {
    // ...
}

// `MyClassifier` doesn't implement `MakeClassifier` but since it doesn't
// care about the incoming request we can make `MyClassifier`s by cloning.
// That is what `SharedClassifier` does.
let make_classifier = SharedClassifier::new(MyClassifier);

// We now have a `MakeClassifier`!
use_make_classifier(make_classifier);

Implementations§

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impl<C> SharedClassifier<C>

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pub fn new(classifier: C) -> Self

Create a new SharedClassifier from the given classifier.

Trait Implementations§

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impl<C: Clone> Clone for SharedClassifier<C>

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fn clone(&self) -> SharedClassifier<C>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<C: Debug> Debug for SharedClassifier<C>

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

Formats the value using the given formatter. Read more
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impl<C> MakeClassifier for SharedClassifier<C>

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type FailureClass = <C as ClassifyResponse>::FailureClass

The type of failure classifications. Read more
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type ClassifyEos = <C as ClassifyResponse>::ClassifyEos

The type used to classify the response end of stream (EOS).
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type Classifier = C

The response classifier produced.
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fn make_classifier<B>(&self, _req: &Request<B>) -> Self::Classifier

Returns a response classifier for this request

Auto Trait Implementations§

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impl<C> Freeze for SharedClassifier<C>
where C: Freeze,

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impl<C> RefUnwindSafe for SharedClassifier<C>
where C: RefUnwindSafe,

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impl<C> Send for SharedClassifier<C>
where C: Send,

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impl<C> Sync for SharedClassifier<C>
where C: Sync,

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impl<C> Unpin for SharedClassifier<C>
where C: Unpin,

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impl<C> UnwindSafe for SharedClassifier<C>
where C: 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<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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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, 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<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.