Struct gotham::pipeline::Pipeline

source ·
pub struct Pipeline<T>where
    T: NewMiddlewareChain,{ /* private fields */ }
Expand description

When using middleware, one or more Middleware are combined to form a Pipeline. Middleware are invoked strictly in the order they’re added to the Pipeline.

At Request dispatch time, the Middleware are created from the NewMiddleware values given to the PipelineBuilder, and combined with a Handler created from the NewHandler provided to Pipeline::call. These Middleware and Handler values are used for a single Request.

Examples

#[derive(StateData)]
struct MiddlewareData {
    vec: Vec<i32>,
}

#[derive(NewMiddleware, Copy, Clone)]
struct MiddlewareOne;

impl Middleware for MiddlewareOne {
    // Implementation elided.
    // Appends `1` to `MiddlewareData.vec`
}

#[derive(NewMiddleware, Copy, Clone)]
struct MiddlewareTwo;

impl Middleware for MiddlewareTwo {
    // Implementation elided.
    // Appends `2` to `MiddlewareData.vec`
}

#[derive(NewMiddleware, Copy, Clone)]
struct MiddlewareThree;

impl Middleware for MiddlewareThree {
    // Implementation elided.
    // Appends `3` to `MiddlewareData.vec`
}

fn handler(state: State) -> (State, Response<Body>) {
    let body = {
        let data = state.borrow::<MiddlewareData>();
        format!("{:?}", data.vec)
    };

    let res = create_response(&state, StatusCode::OK, mime::TEXT_PLAIN, body);

    (state, res)
}

fn main() {
    let (chain, pipelines) = single_pipeline(
        new_pipeline()
            .add(MiddlewareOne)
            .add(MiddlewareTwo)
            .add(MiddlewareThree)
            .build(),
    );

    let router = build_router(chain, pipelines, |route| {
        route.get("/").to(handler);
    });

    let test_server = TestServer::new(router).unwrap();
    let response = test_server
        .client()
        .get("http://example.com/")
        .perform()
        .unwrap();
    assert_eq!(response.status(), StatusCode::OK);
    assert_eq!(response.read_utf8_body().unwrap(), "[1, 2, 3]");
}

Auto Trait Implementations§

§

impl<T> RefUnwindSafe for Pipeline<T>

§

impl<T> Send for Pipeline<T>where T: Send,

§

impl<T> Sync for Pipeline<T>where T: Sync,

§

impl<T> Unpin for Pipeline<T>where T: Unpin,

§

impl<T> UnwindSafe for Pipeline<T>where T: UnwindSafe,

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more