remove send and sync bounds for handler

Author: Rasmus Viitanen

lambda-runtime/src/lib.rs

@@ -93,7 +93,7 @@ pub struct HandlerFn<F> {
 impl<F, A, B, Error, Fut> Handler<A, B> for HandlerFn<F>
 where
     F: Fn(A, Context) -> Fut,
-    Fut: Future<Output = Result<B, Error>> + Send,
+    Fut: Future<Output = Result<B, Error>>,
     Error: Into<Box<dyn std::error::Error + Send + Sync + 'static>> + fmt::Display,
 {
     type Error = Error;
@@ -135,11 +135,11 @@ where
         handler: F,
     ) -> Result<(), Error>
     where
-        F: Handler<A, B> + Send + Sync + RefUnwindSafe,
-        <F as Handler<A, B>>::Fut: Future<Output = Result<B, <F as Handler<A, B>>::Error>> + Send,
-        <F as Handler<A, B>>::Error: fmt::Display + Send + Sync,
-        A: for<'de> Deserialize<'de> + Send + Sync + UnwindSafe,
-        B: Serialize + Send + Sync + UnwindSafe,
+        F: Handler<A, B> + RefUnwindSafe,
+        <F as Handler<A, B>>::Fut: Future<Output = Result<B, <F as Handler<A, B>>::Error>>,
+        <F as Handler<A, B>>::Error: fmt::Display,
+        A: for<'de> Deserialize<'de> + UnwindSafe,
+        B: Serialize + UnwindSafe,
     {
         let client = &self.client;
         tokio::pin!(incoming);
@@ -291,11 +291,11 @@ where
 /// ```
 pub async fn run<A, B, F>(handler: F) -> Result<(), Error>
 where
-    F: Handler<A, B> + Send + Sync + RefUnwindSafe,
-    <F as Handler<A, B>>::Fut: Future<Output = Result<B, <F as Handler<A, B>>::Error>> + Send,
-    <F as Handler<A, B>>::Error: fmt::Display + Send + Sync,
-    A: for<'de> Deserialize<'de> + Send + Sync + UnwindSafe,
-    B: Serialize + Send + Sync + UnwindSafe,
+    F: Handler<A, B> + RefUnwindSafe,
+    <F as Handler<A, B>>::Fut: Future<Output = Result<B, <F as Handler<A, B>>::Error>>,
+    <F as Handler<A, B>>::Error: fmt::Display,
+    A: for<'de> Deserialize<'de> + UnwindSafe,
+    B: Serialize + UnwindSafe,
 {
     trace!("Loading config from env");
     let config = Config::from_env()?;