Add Promise support for http callout

fix ci

Signed-off-by: jizhuozhi.george <jizhuozhi.george@bytedance.com>

Author: jizhuozhi.george

examples/http_parallel_call/src/lib.rs

@@ -25,9 +25,11 @@ proxy_wasm::main! {{
     proxy_wasm::set_http_context(|_, _| -> Box<dyn HttpContext> { Box::new(HttpParallelCall::default()) });
 }}
 
+type OnHttpResponseArgs = (u32, usize, usize, usize);
+
 #[derive(Default)]
 struct HttpParallelCall {
-    m: HashMap<u32, Rc<Promise<(u32, usize, usize, usize)>>>,
+    m: HashMap<u32, Rc<Promise<OnHttpResponseArgs>>>,
 }
 
 impl HttpContext for HttpParallelCall {
@@ -70,10 +72,10 @@ impl HttpContext for HttpParallelCall {
         Promise::all_of(vec![
             promise1
                 .then(|(_, _, _body_size, _)| get_http_call_response_body_string(0, _body_size))
-                .then(|body| body.unwrap_or_else(|| "".to_string())),
+                .then(|body| body.unwrap_or_default()),
             promise2
                 .then(|(_, _, _body_size, _)| get_http_call_response_body_string(0, _body_size))
-                .then(|body| body.unwrap_or_else(|| "".to_string())),
+                .then(|body| body.unwrap_or_default()),
         ])
         .then(|results| {
             send_http_response(

src/promise.rs

@@ -21,10 +21,13 @@ enum PromiseState<T> {
     Rejected(String),
 }
 
+type ThenCallbackRef<T> = RefCell<Option<Box<dyn FnOnce(T)>>>;
+type CatchCallbackRef = RefCell<Option<Box<dyn FnOnce(String)>>>;
+
 pub struct Promise<T> {
     state: RefCell<PromiseState<T>>,
-    then_callback: RefCell<Option<Box<dyn FnOnce(T)>>>,
-    catch_callback: RefCell<Option<Box<dyn FnOnce(String)>>>,
+    then_callback: ThenCallbackRef<T>,
+    catch_callback: CatchCallbackRef,
 }
 
 impl<T> Promise<T>
@@ -202,7 +205,7 @@ mod tests {
         });
 
         promise.fulfill(42);
-        assert_eq!(true, touched.take())
+        assert!(touched.take())
     }
 
     #[test]
@@ -217,7 +220,7 @@ mod tests {
         });
 
         promise.reject("Error".to_string());
-        assert_eq!(true, touched.take())
+        assert!(touched.take())
     }
 
     #[test]
@@ -237,7 +240,7 @@ mod tests {
         });
 
         promise.fulfill(10);
-        assert_eq!(true, touched.take())
+        assert!(touched.take())
     }
 
     #[test]
@@ -264,7 +267,7 @@ mod tests {
                 panic!("Should not reach here");
             });
 
-        assert_eq!(true, touched.take())
+        assert!(touched.take())
     }
 
     #[test]
@@ -289,7 +292,7 @@ mod tests {
                 *touched_clone.borrow_mut() = true;
             });
 
-        assert_eq!(true, touched.take())
+        assert!(touched.take())
     }
 
     #[test]
@@ -314,7 +317,7 @@ mod tests {
                 *touched_clone.borrow_mut() = true;
             });
 
-        assert_eq!(true, touched.take())
+        assert!(touched.take())
     }
 
     #[test]
@@ -333,6 +336,6 @@ mod tests {
                 panic!("Should not reach here");
             });
 
-        assert_eq!(true, touched.take())
+        assert!(touched.take())
     }
 }