1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/rust/warp/examples/wrapping.rs b/third_party/rust/warp/examples/wrapping.rs
new file mode 100644
index 0000000000..bfc84f980f
--- /dev/null
+++ b/third_party/rust/warp/examples/wrapping.rs
@@ -0,0 +1,31 @@
+#![deny(warnings)]
+use warp::Filter;
+
+fn hello_wrapper<F, T>(
+    filter: F,
+) -> impl Filter<Extract = (&'static str,)> + Clone + Send + Sync + 'static
+where
+    F: Filter<Extract = (T,), Error = std::convert::Infallible> + Clone + Send + Sync + 'static,
+    F::Extract: warp::Reply,
+{
+    warp::any()
+        .map(|| {
+            println!("before filter");
+        })
+        .untuple_one()
+        .and(filter)
+        .map(|_arg| "wrapped hello world")
+}
+
+#[tokio::main]
+async fn main() {
+    // Match any request and return hello world!
+    let routes = warp::any()
+        .map(|| "hello world")
+        .boxed()
+        .recover(|_err| async { Ok("recovered") })
+        // wrap the filter with hello_wrapper
+        .with(warp::wrap_fn(hello_wrapper));
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}