pub trait Has<T> {
// Required methods
fn get(&self) -> &T;
fn get_mut(&mut self) -> &mut T;
fn set(&mut self, value: T);
}Expand description
Defines methods for accessing, modifying, adding and removing the data stored in a context. Used to specify the requirements that a hyper service makes on a generic context type that it receives with a request, e.g.
struct MyService<C> {
marker: PhantomData<C>,
}
impl<C> hyper::service::Service for MyService<C>
where C: Has<MyItem> + Send + 'static
{
type ReqBody = ContextualPayload<hyper::Body, C>;
type ResBody = hyper::Body;
type Error = std::io::Error;
type Future = Box<dyn Future<Item=hyper::Response<Self::ResBody>, Error=Self::Error>>;
fn call(&mut self, req : hyper::Request<Self::ReqBody>) -> Self::Future {
let (head, body) = req.into_parts();
do_something_with_my_item(Has::<MyItem>::get(&body.context));
Box::new(ok(hyper::Response::new(hyper::Body::empty())))
}
}