Trait FromContext 

pub trait FromContext: Sized {
    type Rejection: IntoResponse;

    // Required method
    fn from_context(
        cx: &mut ServerContext,
        parts: &mut Parts,
    ) -> impl Future<Output = Result<Self, Self::Rejection>> + Send;
}

Available on crate feature server only.

Extract a type from context (ServerContext and Parts)

This trait is used for handlers, which can extract something from ServerContext and Request.

FromContext only borrows ServerContext and Parts. If your extractor needs to consume Parts or the whole Request, please use FromRequest instead.

Required Associated Types

type Rejection: IntoResponse

If the extractor fails, it will return this Rejection type.

The Rejection should implement IntoResponse. If extractor fails in handler, the rejection will be converted into a Response and returned.

Required Methods

fn from_context( cx: &mut ServerContext, parts: &mut Parts, ) -> impl Future<Output = Result<Self, Self::Rejection>> + Send

Extract the type from context.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl FromContext for Address

type Rejection = Infallible

async fn from_context( cx: &mut ServerContext, _parts: &mut Parts, ) -> Result<Address, Self::Rejection>

impl FromContext for Method

type Rejection = Infallible

async fn from_context( _cx: &mut ServerContext, parts: &mut Parts, ) -> Result<Method, Self::Rejection>

impl FromContext for Uri

type Rejection = Infallible

async fn from_context( _cx: &mut ServerContext, parts: &mut Parts, ) -> Result<Uri, Self::Rejection>

impl<T> FromContext for Option<T>

where T: FromContext,

type Rejection = Infallible

async fn from_context( cx: &mut ServerContext, parts: &mut Parts, ) -> Result<Self, Self::Rejection>

impl<T> FromContext for Result<T, T::Rejection>

where T: FromContext,

type Rejection = Infallible

async fn from_context( cx: &mut ServerContext, parts: &mut Parts, ) -> Result<Self, Self::Rejection>

Implementors

impl FromContext for CookieJar

Available on crate feature cookie only.

type Rejection = Infallible

impl FromContext for PathParamsMap

type Rejection = Infallible

impl FromContext for PathParamsVec

type Rejection = Infallible

impl FromContext for ClientIp

type Rejection = Infallible

impl FromContext for WebSocketUpgrade<DefaultOnFailedUpgrade>

Available on crate feature ws only.

type Rejection = WebSocketUpgradeRejectionError

impl FromContext for FullUri

type Rejection = Error

impl<T1> FromContext for PathParams<(T1,)>

where T1: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2> FromContext for PathParams<(T1, T2)>

where T1: FromPathParam, T2: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3> FromContext for PathParams<(T1, T2, T3)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4> FromContext for PathParams<(T1, T2, T3, T4)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5> FromContext for PathParams<(T1, T2, T3, T4, T5)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6> FromContext for PathParams<(T1, T2, T3, T4, T5, T6)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam, T10: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam, T10: FromPathParam, T11: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam, T10: FromPathParam, T11: FromPathParam, T12: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam, T10: FromPathParam, T11: FromPathParam, T12: FromPathParam, T13: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam, T10: FromPathParam, T11: FromPathParam, T12: FromPathParam, T13: FromPathParam, T14: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam, T10: FromPathParam, T11: FromPathParam, T12: FromPathParam, T13: FromPathParam, T14: FromPathParam, T15: FromPathParam,

type Rejection = PathParamsRejection

impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16> FromContext for PathParams<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16)>

where T1: FromPathParam, T2: FromPathParam, T3: FromPathParam, T4: FromPathParam, T5: FromPathParam, T6: FromPathParam, T7: FromPathParam, T8: FromPathParam, T9: FromPathParam, T10: FromPathParam, T11: FromPathParam, T12: FromPathParam, T13: FromPathParam, T14: FromPathParam, T15: FromPathParam, T16: FromPathParam,

type Rejection = PathParamsRejection

impl<T> FromContext for Extension<T>

where T: Clone + Send + Sync + 'static,

type Rejection = ExtensionRejection

impl<T> FromContext for PathParams<T>

where T: FromPathParam,

type Rejection = PathParamsRejection

impl<T> FromContext for Query<T>

where T: DeserializeOwned,

Available on crate feature query only.

type Rejection = Error