Make HostOutgoingBody::body_output_stream non public

Signed-off-by: Ryan Levick <ryan.levick@fermyon.com>

crates/wasi-http/src/body.rs

@@ -411,7 +411,7 @@ impl WrittenState {
 /// The concrete type behind a `wasi:http/types/outgoing-body` resource.
 pub struct HostOutgoingBody {
     /// The output stream that the body is written to.
-    pub body_output_stream: Option<Box<dyn HostOutputStream>>,
+    body_output_stream: Option<Box<dyn HostOutputStream>>,
     context: StreamContext,
     written: Option<WrittenState>,
     finish_sender: Option<tokio::sync::oneshot::Sender<FinishMessage>>,
@@ -488,6 +488,11 @@ impl HostOutgoingBody {
         )
     }
 
+    /// Take the output stream, if it's available.
+    pub fn take_output_stream(&mut self) -> Option<Box<dyn HostOutputStream>> {
+        self.body_output_stream.take()
+    }
+
     /// Finish the body, optionally with trailers.
     pub fn finish(mut self, trailers: Option<FieldMap>) -> Result<(), types::ErrorCode> {
         // Make sure that the output stream has been dropped, so that the BodyImpl poll function

crates/wasi-http/src/types_impl.rs

@@ -872,7 +872,7 @@ impl<T: WasiHttpView> crate::bindings::http::types::HostOutgoingBody for T {
         id: Resource<HostOutgoingBody>,
     ) -> wasmtime::Result<Result<Resource<OutputStream>, ()>> {
         let body = self.table().get_mut(&id)?;
-        if let Some(stream) = body.body_output_stream.take() {
+        if let Some(stream) = body.take_output_stream() {
             let id = self.table().push_child(stream, &id)?;
             Ok(Ok(id))
         } else {