Question

我想在收到来自用户处理火箭的用户的传入请求并使用尽可能少的资源后，使用Hyper 0.11发出客户端请求。如果我无法重复使用Core或Client，那么每次Rocket点击请求时我都必须创建它们。每次服务器应答请求时，这会在高性能环境中占用太多资源来创建Core和Client。所以我使用State使对象可用于所有“点火”＃。在Hyper 0.10.13中它可以工作，但在带有Tokio的Hyper 0.11中，我收到了大量的错误消息。

Cargo.toml：

rocket = "0.3.3"
rocket_codegen = "0.3.3"
hyper = "0.11"
futures = "0.1"
tokio-core = "0.1"

main.rs

#![feature(plugin, decl_macro)]
#![plugin(rocket_codegen)]
extern crate futures;
extern crate hyper;
extern crate rocket;
extern crate tokio_core;
use rocket::State;
use hyper::*;
use hyper::header::{ContentLength, ContentType};
use futures::{Future, Stream};
use tokio_core::reactor::Core;

fn main() {
    let mut core = Core::new().unwrap();
    let client = Client::new(&core.handle());
    rocket::ignite()
        .mount("/", routes![index])
        .manage(client.clone())
        .launch();
}

#[post("/", data = "<var>")]
fn index(var: String, client: State<hyper::Client<tokio_core::reactor::Handle>>) -> &'static str {
    let json = r#"{"library":"hyper"}"#;
    let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
    let mut req = Request::new(Method::Post, uri);
    req.headers_mut().set(ContentType::json());
    req.headers_mut().set(ContentLength(json.len() as u64));
    req.set_body(json);
    let post = client.request(req).and_then(|res| {
        //println!("POST: {}", res.status());
        res.body().concat2()
    });
}

我收到如下错误消息：

error[E0277]: the trait bound `std::rc::Weak<std::cell::RefCell<tokio_core::reactor::Inner>>: std::marker::Send` is not satisfied in `hyper::Client<tokio_core::reactor::Handle>`
  --> src/main.rs:23:1
   |
23 | / fn index(var: String, client: State<hyper::Client<tokio_core::reactor::Handle>>) -> &'static str {
24 | |     let json = r#"{"library":"hyper"}"#;
25 | |     let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
26 | |     let mut req = Request::new(Method::Post, uri);
...  |
33 | |     });
34 | | }
   | |_^ `std::rc::Weak<std::cell::RefCell<tokio_core::reactor::Inner>>` cannot be sent between threads safely
   |
   = help: within `hyper::Client<tokio_core::reactor::Handle>`, the trait `std::marker::Send` is not implemented for `std::rc::Weak<std::cell::RefCell<tokio_core::reactor::Inner>>`
   = note: required because it appears within the type `tokio_core::reactor::Handle`
   = note: required because it appears within the type `hyper::Client<tokio_core::reactor::Handle>`
   = note: required by `rocket::State`

error[E0277]: the trait bound `std::rc::Weak<std::cell::RefCell<tokio_core::reactor::Inner>>: std::marker::Sync` is not satisfied in `hyper::Client<tokio_core::reactor::Handle>`
  --> src/main.rs:23:1
   |
23 | / fn index(var: String, client: State<hyper::Client<tokio_core::reactor::Handle>>) -> &'static str {
24 | |     let json = r#"{"library":"hyper"}"#;
25 | |     let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
26 | |     let mut req = Request::new(Method::Post, uri);
...  |
33 | |     });
34 | | }
   | |_^ `std::rc::Weak<std::cell::RefCell<tokio_core::reactor::Inner>>` cannot be shared between threads safely
   |
   = help: within `hyper::Client<tokio_core::reactor::Handle>`, the trait `std::marker::Sync` is not implemented for `std::rc::Weak<std::cell::RefCell<tokio_core::reactor::Inner>>`
   = note: required because it appears within the type `tokio_core::reactor::Handle`
   = note: required because it appears within the type `hyper::Client<tokio_core::reactor::Handle>`
   = note: required by `rocket::State`

error[E0277]: the trait bound `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>>>: std::marker::Send` is not satisfied in `hyper::Client<tokio_core::reactor::Handle>`
  --> src/main.rs:23:1
   |
23 | / fn index(var: String, client: State<hyper::Client<tokio_core::reactor::Handle>>) -> &'static str {
24 | |     let json = r#"{"library":"hyper"}"#;
25 | |     let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
26 | |     let mut req = Request::new(Method::Post, uri);
...  |
33 | |     });
34 | | }
   | |_^ `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>>>` cannot be sent between threads safely
   |
   = help: within `hyper::Client<tokio_core::reactor::Handle>`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>>>`
   = note: required because it appears within the type `hyper::client::pool::Pool<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>`
   = note: required because it appears within the type `hyper::client::Dispatch<hyper::Body>`
   = note: required because it appears within the type `hyper::Client<tokio_core::reactor::Handle>`
   = note: required by `rocket::State`

error[E0277]: the trait bound `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>>>: std::marker::Send` is not satisfied in `hyper::Client<tokio_core::reactor::Handle>`
  --> src/main.rs:23:1
   |
23 | / fn index(var: String, client: State<hyper::Client<tokio_core::reactor::Handle>>) -> &'static str {
24 | |     let json = r#"{"library":"hyper"}"#;
25 | |     let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
26 | |     let mut req = Request::new(Method::Post, uri);
...  |
33 | |     });
34 | | }
   | |_^ `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>>>` cannot be sent between threads safely
   |
   = help: within `hyper::Client<tokio_core::reactor::Handle>`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>>>`
   = note: required because it appears within the type `hyper::client::pool::Pool<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>`
   = note: required because it appears within the type `hyper::client::Dispatch<hyper::Body>`
   = note: required because it appears within the type `hyper::Client<tokio_core::reactor::Handle>`
   = note: required by `rocket::State`

error[E0277]: the trait bound `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>>>: std::marker::Sync` is not satisfied in `hyper::Client<tokio_core::reactor::Handle>`
  --> src/main.rs:23:1
   |
23 | / fn index(var: String, client: State<hyper::Client<tokio_core::reactor::Handle>>) -> &'static str {
24 | |     let json = r#"{"library":"hyper"}"#;
25 | |     let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
26 | |     let mut req = Request::new(Method::Post, uri);
...  |
33 | |     });
34 | | }
   | |_^ `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>>>` cannot be shared between threads safely
   |
   = help: within `hyper::Client<tokio_core::reactor::Handle>`, the trait `std::marker::Sync` is not implemented for `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>>>`
   = note: required because it appears within the type `hyper::client::pool::Pool<tokio_proto::util::client_proxy::ClientProxy<tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RequestLine>, hyper::Body>, tokio_proto::streaming::message::Message<hyper::proto::MessageHead<hyper::proto::RawStatus>, tokio_proto::streaming::body::Body<hyper::Chunk, hyper::Error>>, hyper::Error>>`
   = note: required because it appears within the type `hyper::client::Dispatch<hyper::Body>`
   = note: required because it appears within the type `hyper::Client<tokio_core::reactor::Handle>`
   = note: required by `rocket::State`

error[E0277]: the trait bound `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>>>: std::marker::Sync` is not satisfied in `hyper::Client<tokio_core::reactor::Handle>`
  --> src/main.rs:23:1
   |
23 | / fn index(var: String, client: State<hyper::Client<tokio_core::reactor::Handle>>) -> &'static str {
24 | |     let json = r#"{"library":"hyper"}"#;
25 | |     let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
26 | |     let mut req = Request::new(Method::Post, uri);
...  |
33 | |     });
34 | | }
   | |_^ `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>>>` cannot be shared between threads safely
   |
   = help: within `hyper::Client<tokio_core::reactor::Handle>`, the trait `std::marker::Sync` is not implemented for `std::rc::Rc<std::cell::RefCell<hyper::client::pool::PoolInner<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>>>`
   = note: required because it appears within the type `hyper::client::pool::Pool<std::cell::RefCell<futures::sync::mpsc::Sender<(hyper::proto::MessageHead<hyper::proto::RequestLine>, std::option::Option<hyper::Body>, futures::Sender<std::result::Result<hyper::Response, hyper::Error>>)>>>`
   = note: required because it appears within the type `hyper::client::Dispatch<hyper::Body>`
   = note: required because it appears within the type `hyper::Client<tokio_core::reactor::Handle>`
   = note: required by `rocket::State`

我的州有问题吗？请不要为解答付出太多努力。如果你能指出我正确的方向，我可以自己工作。如何使用其他设置解决此问题的另一个解决方案也非常受欢迎。

Answer 1

不，你不能在线程之间共享hyper::Client。但是，您可以共享tokio_core Remote：

#![feature(plugin, decl_macro)]
#![plugin(rocket_codegen)]
extern crate futures;
extern crate hyper;
extern crate rocket;
extern crate tokio_core;

use rocket::State;
use futures::{Future, Stream};
use tokio_core::reactor::Core;

fn main() {
    let core = Core::new().unwrap();
    rocket::ignite()
        .mount("/", routes![index])
        .manage(core.remote())
        .launch();
}

#[post("/", data = "<var>")]
fn index(var: String, remote: State<tokio_core::reactor::Remote>) -> String {
    remote.spawn(|handle| {
        use hyper::{Client, Request, Method};
        use hyper::header::{ContentLength, ContentType};

        let client = Client::new(handle);

        let json = r#"{"library":"hyper"}"#;
        let uri = "http://xxx.xxx.xxx.xxx".parse().unwrap();
        let mut req = Request::new(Method::Post, uri);
        req.headers_mut().set(ContentType::json());
        req.headers_mut().set(ContentLength(json.len() as u64));
        req.set_body(json);

        client.request(req)
            .and_then(|res| res.body().concat2())
            .map(|_| ())
            .map_err(|_| ())
    });

    var
}

然后问题转向你的另一个断言：

每次Rocket点击请求时我都要创建它们。这将在高性能环境中占用太多资源

我不确定你做出这样的决定是什么。 Constructing a Client doesn't do much

我可以在Rocket中重用Tokio Core和Hyper Client吗？

1 个答案: