Trait viz::prelude::Extract[−][src]

pub trait Extract {
    type Error: Into<Response>;
    fn extract(
        cx: &mut Context
    ) -> Pin<Box<dyn Future<Output = Result<Self, Self::Error>> + Send, Global>>ⓘNotable traits for Pin<P>
impl<P> Future for Pin<P> where
    P: DerefMut,
    <P as Deref>::Target: Future,     type Output = <<P as Deref>::Target as Future>::Output;;
}

Expand description

A Extractor trait.

Associated Types

type Error: Into<Response>

The type of failures extracted by this Extractor.

Required methods

fn extract(
cx: &mut Context
) -> Pin<Box<dyn Future<Output = Result<Self, Self::Error>> + Send, Global>>ⓘ
Notable traits for Pin<P>
`impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;`

Extract the value from Context.

Implementations on Foreign Types

impl Extract for FormData<Body>

type Error = PayloadError

pub fn extract(
cx: &mut Context
) -> Pin<Box<dyn Future<Output = Result<FormData<Body>, <FormData<Body> as Extract>::Error>> + Send, Global>>ⓘ
Notable traits for Pin<P>
`impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;`

impl<T> Extract for Result<T, <T as Extract>::Error> where
T: Extract,

type Error = <T as Extract>::Error

pub fn extract(
cx: &mut Context
) -> Pin<Box<dyn Future<Output = Result<Result<T, <T as Extract>::Error>, <Result<T, <T as Extract>::Error> as Extract>::Error>> + Send, Global>>ⓘ
Notable traits for Pin<P>
`impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;`

impl Extract for Arc<Config>

type Error = Error

pub fn extract(
cx: &mut Context
) -> Pin<Box<dyn Future<Output = Result<Arc<Config>, <Arc<Config> as Extract>::Error>> + Send, Global>>ⓘ
Notable traits for Pin<P>
`impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;`

impl<T> Extract for Option<T> where
T: Extract,

type Error = <T as Extract>::Error

pub fn extract(
cx: &mut Context
) -> Pin<Box<dyn Future<Output = Result<Option<T>, <Option<T> as Extract>::Error>> + Send, Global>>ⓘ
Notable traits for Pin<P>
`impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;`

Implementors

impl Extract for Cookies

type Error = CookiesError

impl<T> Extract for Form<T> where
T: DeserializeOwned + Send + Sync,

type Error = PayloadError

impl<T> Extract for Header<T> where
T: Header,

type Error = Error

impl<T> Extract for Json<T> where
T: DeserializeOwned + Send + Sync,

type Error = PayloadError

impl<T> Extract for Params<T> where
T: DeserializeOwned,

type Error = ParamsError

impl<T> Extract for Query<T> where
T: DeserializeOwned,

type Error = PayloadError

impl<T> Extract for State<T> where
T: 'static + Clone + Send + Sync,

type Error = Error