feat(client): add Layer types for client::conn

Author: seanmonstar

src/client/conn.rs

@@ -0,0 +1,262 @@
+//! todo
+
+use std::future::Future;
+use std::marker::PhantomData;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+use http::{Request, Response};
+use tower_service::Service;
+
+type BoxError = Box<dyn std::error::Error + Send + Sync>;
+
+/// todo
+pub struct Http1Layer<B> {
+    builder: hyper::client::conn::http1::Builder,
+    _body: PhantomData<fn(B)>,
+}
+
+/// todo
+pub fn http1<B>() -> Http1Layer<B> {
+    Http1Layer {
+        builder: hyper::client::conn::http1::Builder::new(),
+        _body: PhantomData,
+    }
+}
+
+impl<M, B> tower_layer::Layer<M> for Http1Layer<B> {
+    type Service = Http1Connect<M, B>;
+    fn layer(&self, inner: M) -> Self::Service {
+        Http1Connect {
+            inner,
+            builder: self.builder.clone(),
+            _body: self._body,
+        }
+    }
+}
+
+impl<B> Clone for Http1Layer<B> {
+    fn clone(&self) -> Self {
+        Self {
+            builder: self.builder.clone(),
+            _body: self._body.clone(),
+        }
+    }
+}
+
+impl<B> From<hyper::client::conn::http1::Builder> for Http1Layer<B> {
+    fn from(builder: hyper::client::conn::http1::Builder) -> Self {
+        Self {
+            builder,
+            _body: PhantomData,
+        }
+    }
+}
+
+/// todo
+pub struct Http1Connect<M, B> {
+    inner: M,
+    builder: hyper::client::conn::http1::Builder,
+    _body: PhantomData<fn(B)>,
+}
+
+impl<M, Dst, B> Service<Dst> for Http1Connect<M, B>
+where
+    M: Service<Dst>,
+    M::Future: Send + 'static,
+    M::Response: hyper::rt::Read + hyper::rt::Write + Unpin + Send + 'static,
+    M::Error: Into<BoxError>,
+    B: hyper::body::Body + Send + 'static,
+    B::Data: Send + 'static,
+    B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+{
+    type Response = Http1ClientService<B>;
+    type Error = BoxError;
+    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
+
+    fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        // Minimal, explicit contract: delegate readiness to the response future.
+        // If you want strict backpressure, use the "permit" pattern (see notes).
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, dst: Dst) -> Self::Future {
+        let fut = self.inner.call(dst);
+        let builder = self.builder.clone();
+        Box::pin(async move {
+            let io = fut.await.map_err(Into::into)?;
+            let (tx, conn) = builder.handshake(io).await?;
+            tokio::spawn(async move {
+                if let Err(e) = conn.await {
+                    eprintln!("connection error: {:?}", e);
+                }
+            });
+            Ok(Http1ClientService::new(tx))
+        })
+    }
+}
+
+impl<M: Clone, B> Clone for Http1Connect<M, B> {
+    fn clone(&self) -> Self {
+        Self {
+            inner: self.inner.clone(),
+            builder: self.builder.clone(),
+            _body: self._body.clone(),
+        }
+    }
+}
+
+/// todo
+pub struct Http2Layer<B> {
+    _body: PhantomData<fn(B)>,
+}
+
+/// todo
+pub fn http2<B>() -> Http2Layer<B> {
+    Http2Layer { _body: PhantomData }
+}
+
+impl<M, B> tower_layer::Layer<M> for Http2Layer<B> {
+    type Service = Http2Connect<M, B>;
+    fn layer(&self, inner: M) -> Self::Service {
+        Http2Connect {
+            inner,
+            builder: hyper::client::conn::http2::Builder::new(crate::rt::TokioExecutor::new()),
+            _body: self._body,
+        }
+    }
+}
+
+impl<B> Clone for Http2Layer<B> {
+    fn clone(&self) -> Self {
+        Self {
+            _body: self._body.clone(),
+        }
+    }
+}
+
+/// todo
+#[derive(Debug)]
+pub struct Http2Connect<M, B> {
+    inner: M,
+    builder: hyper::client::conn::http2::Builder<crate::rt::TokioExecutor>,
+    _body: PhantomData<fn(B)>,
+}
+
+impl<M, Dst, B> Service<Dst> for Http2Connect<M, B>
+where
+    M: Service<Dst>,
+    M::Future: Send + 'static,
+    M::Response: hyper::rt::Read + hyper::rt::Write + Unpin + Send + 'static,
+    M::Error: Into<BoxError>,
+    B: hyper::body::Body + Unpin + Send + 'static,
+    B::Data: Send + 'static,
+    B::Error: Into<BoxError>,
+{
+    type Response = Http2ClientService<B>;
+    type Error = BoxError;
+    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
+
+    fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        // Minimal, explicit contract: delegate readiness to the response future.
+        // If you want strict backpressure, use the "permit" pattern (see notes).
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, dst: Dst) -> Self::Future {
+        let fut = self.inner.call(dst);
+        let builder = self.builder.clone();
+        Box::pin(async move {
+            let io = fut.await.map_err(Into::into)?;
+            let (tx, conn) = builder.handshake(io).await?;
+            tokio::spawn(async move {
+                if let Err(e) = conn.await {
+                    eprintln!("connection error: {:?}", e);
+                }
+            });
+            Ok(Http2ClientService::new(tx))
+        })
+    }
+}
+
+impl<M: Clone, B> Clone for Http2Connect<M, B> {
+    fn clone(&self) -> Self {
+        Self {
+            inner: self.inner.clone(),
+            builder: self.builder.clone(),
+            _body: self._body.clone(),
+        }
+    }
+}
+
+/// A thin adapter over hyper HTTP/1 client SendRequest.
+#[derive(Debug)]
+pub struct Http1ClientService<B> {
+    tx: hyper::client::conn::http1::SendRequest<B>,
+}
+
+impl<B> Http1ClientService<B> {
+    /// todo
+    pub fn new(tx: hyper::client::conn::http1::SendRequest<B>) -> Self {
+        Self { tx }
+    }
+}
+
+impl<B> Service<Request<B>> for Http1ClientService<B>
+where
+    B: hyper::body::Body + Send + 'static,
+{
+    type Response = Response<hyper::body::Incoming>;
+    type Error = hyper::Error;
+    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
+
+    fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        // Minimal, explicit contract: delegate readiness to the response future.
+        // If you want strict backpressure, use the "permit" pattern (see notes).
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, req: Request<B>) -> Self::Future {
+        let fut = self.tx.send_request(req);
+        Box::pin(async move { Ok(fut.await?) })
+    }
+}
+
+/// todo
+#[derive(Debug)]
+pub struct Http2ClientService<B> {
+    tx: hyper::client::conn::http2::SendRequest<B>,
+}
+
+impl<B> Http2ClientService<B> {
+    /// todo
+    pub fn new(tx: hyper::client::conn::http2::SendRequest<B>) -> Self {
+        Self { tx }
+    }
+}
+
+impl<B> Service<Request<B>> for Http2ClientService<B>
+where
+    B: hyper::body::Body + Send + 'static,
+{
+    type Response = Response<hyper::body::Incoming>;
+    type Error = hyper::Error;
+    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
+
+    fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, req: Request<B>) -> Self::Future {
+        let fut = self.tx.send_request(req);
+        Box::pin(async move { Ok(fut.await?) })
+    }
+}
+
+impl<B> Clone for Http2ClientService<B> {
+    fn clone(&self) -> Self {
+        Self {
+            tx: self.tx.clone(),
+        }
+    }
+}

src/client/mod.rs

@@ -1,5 +1,7 @@
 //! HTTP client utilities
 
+pub mod conn;
+
 /// Legacy implementations of `connect` module and `Client`
 #[cfg(feature = "client-legacy")]
 pub mod legacy;