1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/rust/hyper/src/body/mod.rs b/third_party/rust/hyper/src/body/mod.rs
new file mode 100644
index 0000000000..5e2181e941
--- /dev/null
+++ b/third_party/rust/hyper/src/body/mod.rs
@@ -0,0 +1,65 @@
+//! Streaming bodies for Requests and Responses
+//!
+//! For both [Clients](crate::client) and [Servers](crate::server), requests and
+//! responses use streaming bodies, instead of complete buffering. This
+//! allows applications to not use memory they don't need, and allows exerting
+//! back-pressure on connections by only reading when asked.
+//!
+//! There are two pieces to this in hyper:
+//!
+//! - **The [`HttpBody`](HttpBody) trait** describes all possible bodies.
+//!   hyper allows any body type that implements `HttpBody`, allowing
+//!   applications to have fine-grained control over their streaming.
+//! - **The [`Body`](Body) concrete type**, which is an implementation of
+//!   `HttpBody`, and returned by hyper as a "receive stream" (so, for server
+//!   requests and client responses). It is also a decent default implementation
+//!   if you don't have very custom needs of your send streams.
+
+pub use bytes::{Buf, Bytes};
+pub use http_body::Body as HttpBody;
+pub use http_body::SizeHint;
+
+pub use self::aggregate::aggregate;
+pub use self::body::{Body, Sender};
+pub(crate) use self::length::DecodedLength;
+pub use self::to_bytes::to_bytes;
+
+mod aggregate;
+mod body;
+mod length;
+mod to_bytes;
+
+/// An optimization to try to take a full body if immediately available.
+///
+/// This is currently limited to *only* `hyper::Body`s.
+#[cfg(feature = "http1")]
+pub(crate) fn take_full_data<T: HttpBody + 'static>(body: &mut T) -> Option<T::Data> {
+    use std::any::{Any, TypeId};
+
+    // This static type check can be optimized at compile-time.
+    if TypeId::of::<T>() == TypeId::of::<Body>() {
+        let mut full = (body as &mut dyn Any)
+            .downcast_mut::<Body>()
+            .expect("must be Body")
+            .take_full_data();
+        // This second cast is required to make the type system happy.
+        // Without it, the compiler cannot reason that the type is actually
+        // `T::Data`. Oh wells.
+        //
+        // It's still a measurable win!
+        (&mut full as &mut dyn Any)
+            .downcast_mut::<Option<T::Data>>()
+            .expect("must be T::Data")
+            .take()
+    } else {
+        None
+    }
+}
+
+fn _assert_send_sync() {
+    fn _assert_send<T: Send>() {}
+    fn _assert_sync<T: Sync>() {}
+
+    _assert_send::<Body>();
+    _assert_sync::<Body>();
+}