Struct `SharedClassifier`

struct SharedClassifier<C> { ... }

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

`impl<C> SharedClassifier<C>`

fn new(classifier: C) -> Self where C: ClassifyResponse + Clone: Create a new SharedClassifier from the given classifier.

`impl<C> Freeze for SharedClassifier<C>`

`impl<C> MakeClassifier for SharedClassifier<C>`

fn make_classifier<B>(self: &Self, _req: &Request<B>) -> <Self as >::Classifier

`impl<C> RefUnwindSafe for SharedClassifier<C>`

`impl<C> Send for SharedClassifier<C>`

`impl<C> Sync for SharedClassifier<C>`

`impl<C> Unpin for SharedClassifier<C>`

`impl<C> UnsafeUnpin for SharedClassifier<C>`

`impl<C> UnwindSafe for SharedClassifier<C>`

`impl<C: $crate::clone::Clone> Clone for SharedClassifier<C>`

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

`impl<C: $crate::fmt::Debug> Debug for SharedClassifier<C>`

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

`impl<T> Any for SharedClassifier<C>`

fn type_id(self: &Self) -> TypeId

`impl<T> Borrow for SharedClassifier<C>`

fn borrow(self: &Self) -> &T

`impl<T> BorrowMut for SharedClassifier<C>`

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

`impl<T> CloneToUninit for SharedClassifier<C>`

unsafe fn clone_to_uninit(self: &Self, dest: *mut u8)

`impl<T> From for SharedClassifier<C>`

fn from(t: T) -> T: Returns the argument unchanged.

`impl<T> Instrument for SharedClassifier<C>`

`impl<T> PolicyExt for SharedClassifier<C>`

fn and<P, B, E>(self: Self, other: P) -> And<T, P> where T: Policy<B, E>, P: Policy<B, E>
fn or<P, B, E>(self: Self, other: P) -> Or<T, P> where T: Policy<B, E>, P: Policy<B, E>

`impl<T> ToOwned for SharedClassifier<C>`

fn to_owned(self: &Self) -> T
fn clone_into(self: &Self, target: &mut T)

`impl<T> WithSubscriber for SharedClassifier<C>`

`impl<T, U> Into for SharedClassifier<C>`

fn into(self: Self) -> U

Calls U::from(self).

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

`impl<T, U> TryFrom for SharedClassifier<C>`

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

`impl<T, U> TryInto for SharedClassifier<C>`

fn try_into(self: Self) -> Result<U, <U as TryFrom<T>>::Error>