http: takeover MaybeTlsStream from proxmox_backup

this is just a (rather HTTP specific) wrapper, so put it into a
'wrapper' module for now.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

proxmox-http/Cargo.toml

@@ -18,11 +18,13 @@ futures = { version = "0.3", optional = true }
 hyper = { version = "0.14", features = [ "full" ], optional = true }
 openssl =  { version = "0.10", optional = true }
 tokio = { version = "1.0", features = [], optional = true }
+tokio-openssl = { version = "0.6.1", optional = true }
 
 proxmox = { path = "../proxmox", optional = true, version = "0.11.3", default-features = false }
 
 [features]
 default = []
 
-client = []
+client = [ "http-helpers" ]
+http-helpers = [ "hyper", "tokio/io-util", "tokio-openssl" ]
 websocket = [ "base64", "futures", "hyper", "openssl", "proxmox/tokio", "tokio/io-util", "tokio/sync" ]

proxmox-http/src/http/mod.rs

@@ -0,0 +1,3 @@
+mod wrapper;
+
+pub use wrapper::MaybeTlsStream;

proxmox-http/src/http/wrapper.rs

@@ -0,0 +1,122 @@
+use std::io;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+use hyper::client::connect::{Connection, Connected};
+use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+use tokio_openssl::SslStream;
+
+/// Asynchronous stream, possibly encrypted and proxied
+///
+/// Usefule for HTTP client implementations using hyper.
+pub enum MaybeTlsStream<S> {
+    Normal(S),
+    Proxied(S),
+    Secured(SslStream<S>),
+}
+
+impl<S: AsyncRead + AsyncWrite + Unpin> AsyncRead for MaybeTlsStream<S> {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        cx: &mut Context,
+        buf: &mut ReadBuf,
+    ) -> Poll<Result<(), io::Error>> {
+        match self.get_mut() {
+            MaybeTlsStream::Normal(ref mut s) => {
+                Pin::new(s).poll_read(cx, buf)
+            }
+            MaybeTlsStream::Proxied(ref mut s) => {
+                Pin::new(s).poll_read(cx, buf)
+            }
+            MaybeTlsStream::Secured(ref mut s) => {
+                Pin::new(s).poll_read(cx, buf)
+            }
+        }
+    }
+}
+
+impl<S: AsyncRead + AsyncWrite + Unpin> AsyncWrite for MaybeTlsStream<S> {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        cx: &mut Context,
+        buf: &[u8],
+    ) -> Poll<Result<usize, io::Error>> {
+        match self.get_mut() {
+            MaybeTlsStream::Normal(ref mut s) => {
+                Pin::new(s).poll_write(cx, buf)
+            }
+            MaybeTlsStream::Proxied(ref mut s) => {
+                Pin::new(s).poll_write(cx, buf)
+            }
+            MaybeTlsStream::Secured(ref mut s) => {
+                Pin::new(s).poll_write(cx, buf)
+            }
+        }
+    }
+
+    fn poll_write_vectored(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        bufs: &[io::IoSlice<'_>],
+    ) -> Poll<Result<usize, io::Error>> {
+        match self.get_mut() {
+            MaybeTlsStream::Normal(ref mut s) => {
+                Pin::new(s).poll_write_vectored(cx, bufs)
+            }
+            MaybeTlsStream::Proxied(ref mut s) => {
+                Pin::new(s).poll_write_vectored(cx, bufs)
+            }
+            MaybeTlsStream::Secured(ref mut s) => {
+                Pin::new(s).poll_write_vectored(cx, bufs)
+            }
+        }
+    }
+
+    fn is_write_vectored(&self) -> bool {
+        match self {
+            MaybeTlsStream::Normal(s) => s.is_write_vectored(),
+            MaybeTlsStream::Proxied(s) => s.is_write_vectored(),
+            MaybeTlsStream::Secured(s) => s.is_write_vectored(),
+        }
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), io::Error>> {
+        match self.get_mut() {
+            MaybeTlsStream::Normal(ref mut s) => {
+                Pin::new(s).poll_flush(cx)
+            }
+            MaybeTlsStream::Proxied(ref mut s) => {
+                Pin::new(s).poll_flush(cx)
+            }
+            MaybeTlsStream::Secured(ref mut s) => {
+                Pin::new(s).poll_flush(cx)
+            }
+        }
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), io::Error>> {
+        match self.get_mut() {
+            MaybeTlsStream::Normal(ref mut s) => {
+                Pin::new(s).poll_shutdown(cx)
+            }
+            MaybeTlsStream::Proxied(ref mut s) => {
+                Pin::new(s).poll_shutdown(cx)
+            }
+            MaybeTlsStream::Secured(ref mut s) => {
+                Pin::new(s).poll_shutdown(cx)
+            }
+        }
+    }
+}
+
+// we need this for the hyper http client
+impl <S: Connection + AsyncRead + AsyncWrite + Unpin> Connection for MaybeTlsStream<S>
+{
+    fn connected(&self) -> Connected {
+        match self {
+            MaybeTlsStream::Normal(s) => s.connected(),
+            MaybeTlsStream::Proxied(s) => s.connected().proxy(true),
+            MaybeTlsStream::Secured(s) => s.get_ref().connected(),
+        }
+    }
+}

proxmox-http/src/lib.rs

@@ -1,2 +1,5 @@
 #[cfg(feature = "websocket")]
 pub mod websocket;
+
+#[cfg(feature = "http-helpers")]
+pub mod http;