iota_network_stack/callback/
future.rs

1// Copyright (c) Mysten Labs, Inc.
2// Modifications Copyright (c) 2024 IOTA Stiftung
3// SPDX-License-Identifier: Apache-2.0
4
5use std::{
6    future::Future,
7    pin::Pin,
8    task::{Context, Poll},
9};
10
11use http::Response;
12use pin_project_lite::pin_project;
13
14use super::{ResponseBody, ResponseHandler};
15
16pin_project! {
17    /// Response future for [`Callback`].
18    ///
19    /// [`Callback`]: super::Callback
20    pub struct ResponseFuture<F, ResponseHandler> {
21        #[pin]
22        pub(crate) inner: F,
23        pub(crate) handler: Option<ResponseHandler>,
24    }
25}
26
27impl<Fut, B, E, ResponseHandlerT> Future for ResponseFuture<Fut, ResponseHandlerT>
28where
29    Fut: Future<Output = Result<Response<B>, E>>,
30    B: http_body::Body<Error: std::fmt::Display + 'static>,
31    E: std::fmt::Display + 'static,
32    ResponseHandlerT: ResponseHandler,
33{
34    type Output = Result<Response<ResponseBody<B, ResponseHandlerT>>, E>;
35
36    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
37        let this = self.project();
38        let result = futures::ready!(this.inner.poll(cx));
39        let mut handler = this.handler.take().unwrap();
40
41        let result = match result {
42            Ok(response) => {
43                let (head, body) = response.into_parts();
44                handler.on_response(&head);
45                Ok(Response::from_parts(
46                    head,
47                    ResponseBody {
48                        inner: body,
49                        handler,
50                    },
51                ))
52            }
53            Err(error) => {
54                handler.on_error(&error);
55                Err(error)
56            }
57        };
58
59        Poll::Ready(result)
60    }
61}
iota_network_stack/callback/future.rs

iota_network_stack/callback/
future.rs
