“Error E0477: the type does not fulfill the required lifetime” with Actix-Web handlers

0
votes

I am trying to implement an HTTP request handler using Actix-Web. Here is the relevant part of my code:

impl<S> Handler<S> for FooBarHandler {
    type Result = Box<Future<Item = HttpResponse, Error = Error>>;

    fn handle(&mut self, req : HttpRequest<S>) -> Self::Result {
        req.json().from_err().and_then(|foo : Foo|
            self.baz.qux(foo);
            Ok(HttpResponse::Ok().finish())
        }).responder()
    }
}

However, I receive this error message:

error[E0477]: the type  `mymod::futures::AndThen<mymod::futures::future::FromErr<mymod::actix_web::dev::JsonBody<mymod::actix_web::HttpRequest<S>, mymod::Foo>, mymod::actix_web::Error>, std::result::Result<mymod::actix_web::HttpResponse, mymod::actix_web::Error>, [closure@src/mymod.rs:53:40: 56:10 self:&&mut mymod::FooBarHandler]>` does not fulfill the required lifetime
  --> src/mymod.rs:56:12
   |
56 |         }).responder()
   |            ^^^^^^^^^
   |
   = note: type must satisfy the static lifetime

I do not understand this error message at all. The code is practically identical to this example, which does not contain any lifetime annotations.

1
rustrust-actix
As currently posed, this question is off-topic: Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself.. You haven't provided the definition of FooBarHandler, you haven't shown what crates (and their versions!) you are importing, etc. In fact, your code isn't syntactically valid. - Shepmaster

1 Answers

2
votes

You use self inside your .and_then future, which violates lifetime requirement.