Trait tower_http::classify::ClassifyEos

pub trait ClassifyEos {
    type FailureClass;
    fn classify_eos(
        self, 
        trailers: Option<&HeaderMap>
    ) -> Result<(), Self::FailureClass>;
    fn classify_error<E>(self, error: &E) -> Self::FailureClass
    where
        E: Display + 'static;

    fn map_failure_class<F, NewClass>(self, f: F) -> MapFailureClass<Self, F>
    where
        Self: Sized,
        F: FnOnce(Self::FailureClass) -> NewClass,
    { ... }
}

Trait for classifying end of streams (EOS) as either success or failure.

Associated Types

type FailureClass

The type of failure classifications.

Required methods

fn classify_eos(
    self,
    trailers: Option<&HeaderMap>
) -> Result<(), Self::FailureClass>

Perform the classification from response trailers.

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

Classify an error.

Errors are always errors (doh) but sometimes it might be useful to have multiple classes of errors. A retry policy might allow retrying some errors and not others.

Provided methods

fn map_failure_class<F, NewClass>(self, f: F) -> MapFailureClass<Self, F> where
    Self: Sized,
    F: FnOnce(Self::FailureClass) -> NewClass, 

Transform the failure classification using a function.

See ClassifyResponse::map_failure_class for more details.

Implementors

impl ClassifyEos for GrpcEosErrorsAsFailures

type FailureClass = GrpcFailureClass

impl<C, F, NewClass> ClassifyEos for MapFailureClass<C, F> where
    C: ClassifyEos,
    F: FnOnce(C::FailureClass) -> NewClass, 

type FailureClass = NewClass

impl<T> ClassifyEos for NeverClassifyEos<T>

type FailureClass = T