chore: Use a fork of hyper with Body::poll_progress

hyperium/http-body#90 proposes adding a `Body::poll_progress` method to the
`Body` trait. This PR uses a fork of hyper that uses this proposed API when
awaiting stream send capacity. This supports implementing timeouts on streams
and connections in an unhealthy state to defend servers against resource
exhaustion.

Author: olix0r

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "http-body"]
+	path = http-body
+	url = [email protected]:olix0r/http-body.git
+[submodule "hyper"]
+	path = hyper
+	url = [email protected]:olix0r/hyper.git

Cargo.lock

@@ -824,8 +824,6 @@ dependencies = [
 [[package]]
 name = "http-body"
 version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ceab25649e9960c0311ea418d17bee82c0dcec1bd053b5f9a66e265a693bed2"
 dependencies = [
  "bytes",
  "http",
@@ -853,8 +851,6 @@ checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 [[package]]
 name = "hyper"
 version = "0.14.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf96e135eb83a2a8ddf766e426a841d8ddd7449d5f00d34ea02b41d2f19eef80"
 dependencies = [
  "bytes",
  "futures-channel",

Cargo.toml

@@ -79,6 +79,15 @@ members = [
     "tools",
 ]
 
+exclude = [
+    "http-body",
+    "hyper",
+]
+
 [profile.release]
 debug = 1
 lto = true
+
+[patch.crates-io]
+http-body = { path = "http-body" }
+hyper = { path = "hyper" }

http-body

@@ -116,6 +116,11 @@ where
         Poll::Ready(ret)
     }
 
+    #[inline]
+    fn poll_progress(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.project().body.poll_progress(cx)
+    }
+
     fn poll_trailers(
         self: Pin<&mut Self>,
         cx: &mut Context<'_>,

hyper

@@ -469,6 +469,13 @@ where
         }
     }
 
+    fn poll_progress(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        match self.project() {
+            ResponseBodyProj::Passthru(inner) => inner.poll_progress(cx),
+            ResponseBodyProj::GrpcRescue { inner, .. } => inner.poll_progress(cx),
+        }
+    }
+
     #[inline]
     fn poll_trailers(
         self: Pin<&mut Self>,

hyper-balance/src/lib.rs

@@ -58,6 +58,14 @@ impl Body for BoxBody {
         self.as_mut().inner.as_mut().poll_data(cx)
     }
 
+    #[inline]
+    fn poll_progress(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<(), Self::Error>> {
+        self.as_mut().inner.as_mut().poll_progress(cx)
+    }
+
     #[inline]
     fn poll_trailers(
         mut self: Pin<&mut Self>,
@@ -116,12 +124,17 @@ where
         }))
     }
 
+    #[inline]
+    fn poll_progress(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.project().0.poll_progress(cx).map_err(Into::into)
+    }
+
     #[inline]
     fn poll_trailers(
         self: Pin<&mut Self>,
         cx: &mut Context<'_>,
     ) -> Poll<Result<Option<HeaderMap<HeaderValue>>, Self::Error>> {
-        Poll::Ready(futures::ready!(self.project().0.poll_trailers(cx)).map_err(Into::into))
+        self.project().0.poll_trailers(cx).map_err(Into::into)
     }
 
     #[inline]

linkerd/app/core/src/errors/respond.rs

@@ -283,6 +283,12 @@ where
         Poll::Ready(frame)
     }
 
+    #[inline]
+    fn poll_progress(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.project().inner.poll_progress(cx)
+    }
+
+    #[inline]
     fn poll_trailers(
         self: Pin<&mut Self>,
         cx: &mut Context<'_>,
@@ -422,6 +428,11 @@ where
         Poll::Ready(frame)
     }
 
+    #[inline]
+    fn poll_progress(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.project().inner.poll_progress(cx).map_err(Into::into)
+    }
+
     fn poll_trailers(
         mut self: Pin<&mut Self>,
         cx: &mut Context<'_>,

linkerd/http/box/src/body.rs

@@ -251,6 +251,21 @@ where
         Poll::Ready(Some(Ok(Data::Initial(chunk))))
     }
 
+    fn poll_progress(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        let this = self.get_mut();
+        let state = Self::acquire_state(&mut this.state, &this.shared.body);
+        tracing::trace!("ReplayBody::poll_progress");
+
+        if let Some(rest) = state.rest.as_mut() {
+            // If the inner body has previously ended, don't poll it again.
+            if !rest.is_end_stream() {
+                return Pin::new(rest).poll_progress(cx).map_err(Into::into);
+            }
+        }
+
+        Poll::Ready(Ok(()))
+    }
+
     fn poll_trailers(
         self: Pin<&mut Self>,
         cx: &mut Context<'_>,