Struct SharedClassifier

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

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.

Trait Implementations

impl<C> MakeClassifier for SharedClassifier<C> where C: ClassifyResponse + Clone,

type FailureClass = <C as ClassifyResponse>::FailureClass;
type ClassifyEos = <C as ClassifyResponse>::ClassifyEos;
type Classifier = C;
fn make_classifier<B>(&self, _req: &Request<B>) -> Self::Classifier

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

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

impl<C: Debug> Debug for SharedClassifier<C>

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

Auto Trait Implementations

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

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

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

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

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

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

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

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for SharedClassifier<C> where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for SharedClassifier<C> where T: ?Sized,

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

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

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

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

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Instrument for SharedClassifier<C>

impl<T> PolicyExt for SharedClassifier<C> where T: ?Sized,

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

impl<T> ToOwned for SharedClassifier<C> where T: Clone,

type Owned = T;
fn to_owned(&self) -> T
fn clone_into(&self, target: &mut T)

impl<T> WithSubscriber for SharedClassifier<C>

impl<T, U> Into<U> for SharedClassifier<C> where U: From<T>,

fn into(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<U> for SharedClassifier<C> where U: Into<T>,

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

impl<T, U> TryInto<U> for SharedClassifier<C> where U: TryFrom<T>,

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