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
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more