asynchronous - 在oneshot channel : object safety error中使用 `DeserializedOwned`特征

Question

如下代码:

trait ClientResponse: DeserializeOwned + Send + Sized {}

struct ClientMsg {
    ...
    resp: oneshot::Sender<Box<dyn ClientResponse>>
}

async fn client_thread(rx: mpsc::Receiver<ClientMsg>, client: reqwest::Client, base_url: Url) -> Result<(), Box<dyn Error>> {
    while let Some(msg) = rx.recv().await {
        ...
        let response = client.get(url).send().await?.json().await?;
        msg.resp.send(response);
    }
}

失败并出现错误:

error[E0038]: the trait `ClientResponse` cannot be made into an object
  --> src/main.rs:16:11
   |
16 |     resp: oneshot::Sender<Box<dyn ClientResponse>>
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `ClientResponse` cannot be made into an object
   |
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  --> src/main.rs:12:23
   |
12 | trait ClientResponse: DeserializeOwned + Send + Sized {}
   |       --------------  ^^^^^^^^^^^^^^^^          ^^^^^ ...because it requires `Self: Sized`
   |       |               |
   |       |               ...because it requires `Self: Sized`
   |       this trait cannot be made into an object...

如您所见，在读取编译器错误之后，我尝试将 Sized特征添加为 super 特征，但是它仍然给我同样的错误。我不确定其他方法如何解决该问题，因为我想要一个客户端线程，该线程可以将响应反序列化为发送者确定的类型。

Answer 1

有一个箱子专门用于使Serde特质对象安全，称为erased-serde