Struct tower_web::extract::Immediate

pub struct Immediate<T> { /* fields omitted */ }

Implements ExtractFuture such that the result is immediately available.

This type is useful when implementing Extract for types that do not require any asynchronous processing. For example, extracting an HTTP header value from an HTTP request can complete immediately as all the information is present.

Methods

impl<T> Immediate<T>

pub fn ok(value: T) -> Immediate<T>

Create a new Immediate instance that is in the success state.

When polling the returned Immediate instance, it will yield value.

pub fn err(error: Error) -> Immediate<T>

Create a new Immediate instance that is in the error state.

When polling the returned Immediate instance, it will yield error.

Trait Implementations

impl<T: Debug> Debug for Immediate<T>

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

Formats the value using the given formatter.

impl<T> ExtractFuture for Immediate<T>

type Item = T

The argument extracted from the request.

fn poll(&mut self) -> Poll<(), Error>

Returns Ok(Ready(())) when extract() can be called. If NotReady is returned, the current task is registered for wakeup.

fn extract(self) -> T

Consume self and return the value extracted from the HTTP request.

impl<T, E> From<Result<T, E>> for Immediate<T> where     E: Into<Error>,

fn from(src: Result<T, E>) -> Self

Performs the conversion.