Hyper Future "cannot be sent between threads safely"

help
1 
let addr = bind.parse().unwrap();
let server_gen = NewServer { singleton: Server::new(pool, store) };
let server = hyper::Server::bind(&addr)
    .serve(server_gen)
    .map_err(|e| error!("Server Error [500]: {}", e));
rt::run(server);

I have a Hyper service (Server) and a struct that implements NewService (NewServer), but when I try to compile this, I get the following error:

error[E0277]: (dyn hyper::rt::Future<Error=hyper::Error, Item=hyper::Response<hyper::Body>> + 'static) cannot be sent between threads safely
--> src/main.rs:55:10 |
55 | .serve(server_gen)
| ^^^^^ (dyn hyper::rt::Future<Error=hyper::Error, Item=hyper::Response<hyper::Body>> + 'static) cannot be sent between threads safely
|
= help: the trait std::marker::Send is not implemented for (dyn hyper::rt::Future<Error=hyper::Error, Item=hyper::Response<hyper::Body>> + 'static)
= note: required because of the requirements on the impl of std::marker::Send for std::ptr::Unique<(dyn hyper::rt::Future<Error=hyper::Error, Item=hyper::Response<hyper::Bo dy>> + 'static)>
= note: required because it appears within the type std::boxed::Box<(dyn hyper::rt::Future<Error=hyper::Error, Item=hyper::Response<hyper::Body>> + 'static)>

Server implements Send, it looks like it is saying the actual boxed future doesn't implement Send?

2

Oh, I think I need to actually add the Send bound to the associated Future type of the Service impl for Server

3

Can you explain your solution, please?

4

Please don't revive year old threads.

To answer your question, they needed to change

dyn hyper::rt::Future<Error=hyper::Error, Item=hyper::Response<hyper::Body>> + 'static

to

dyn hyper::rt::Future<Error=hyper::Error, Item=hyper::Response<hyper::Body>> + Send + 'static

In order to send it across threads

5

@bingli224 You can always reply as a linked topic if you want to:

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