1//! Utilities used to interact with the Tower ecosystem.
2//!
3//! This module provides `Connect` which hook-ins into the Tower ecosystem.
4
5use std::error::Error as StdError;
6use std::future::Future;
7use std::marker::PhantomData;
8
9use tracing::debug;
10
11use super::conn::{Builder, SendRequest};
12use crate::{
13 body::HttpBody,
14 common::{task, Pin, Poll},
15 service::{MakeConnection, Service},
16};
17
18/// Creates a connection via `SendRequest`.
19///
20/// This accepts a `hyper::client::conn::Builder` and provides
21/// a `MakeService` implementation to create connections from some
22/// target `T`.
23#[derive(Debug)]
24pub struct Connect<C, B, T> {
25 inner: C,
26 builder: Builder,
27 _pd: PhantomData<fn(T, B)>,
28}
29
30impl<C, B, T> Connect<C, B, T> {
31 /// Create a new `Connect` with some inner connector `C` and a connection
32 /// builder.
33 pub fn new(inner: C, builder: Builder) -> Self {
34 Self {
35 inner,
36 builder,
37 _pd: PhantomData,
38 }
39 }
40}
41
42impl<C, B, T> Service<T> for Connect<C, B, T>
43where
44 C: MakeConnection<T>,
45 C::Connection: Unpin + Send + 'static,
46 C::Future: Send + 'static,
47 C::Error: Into<Box<dyn StdError + Send + Sync>> + Send,
48 B: HttpBody + Unpin + Send + 'static,
49 B::Data: Send + Unpin,
50 B::Error: Into<Box<dyn StdError + Send + Sync>>,
51{
52 type Response = SendRequest<B>;
53 type Error = crate::Error;
54 type Future =
55 Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send + 'static>>;
56
57 fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
58 self.inner
59 .poll_ready(cx)
60 .map_err(|e| crate::Error::new(crate::error::Kind::Connect).with(e.into()))
61 }
62
63 fn call(&mut self, req: T) -> Self::Future {
64 let builder = self.builder.clone();
65 let io = self.inner.make_connection(req);
66
67 let fut = async move {
68 match io.await {
69 Ok(io) => match builder.handshake(io).await {
70 Ok((sr, conn)) => {
71 builder.exec.execute(async move {
72 if let Err(e) = conn.await {
73 debug!("connection error: {:?}", e);
74 }
75 });
76 Ok(sr)
77 }
78 Err(e) => Err(e),
79 },
80 Err(e) => {
81 let err = crate::Error::new(crate::error::Kind::Connect).with(e.into());
82 Err(err)
83 }
84 }
85 };
86
87 Box::pin(fut)
88 }
89}
90