optimize ServiceRequest methods

src/request.rs

@@ -17,6 +17,9 @@ use crate::rmap::ResourceMap;
 #[derive(Clone)]
 /// An HTTP Request
 pub struct HttpRequest(pub(crate) Rc<HttpRequestInner>);
+// *. Rc<HttpRequestInner> is used exclusively and NO Weak<HttpRequestInner>
+// is allowed anywhere in the code. Weak pointer is purposely ignored when
+// doing Rc's ref counter check.
 
 pub(crate) struct HttpRequestInner {
     pub(crate) head: Message<RequestHead>,

src/service.rs

@@ -73,11 +73,12 @@ impl ServiceRequest {
         mut req: HttpRequest,
         pl: Payload,
     ) -> Result<Self, (HttpRequest, Payload)> {
-        if Rc::strong_count(&req.0) == 1 && Rc::weak_count(&req.0) == 0 {
+        match Rc::get_mut(&mut req.0) {
-            Rc::get_mut(&mut req.0).unwrap().payload = pl;
+            Some(p) => {
+                p.payload = pl;
                 Ok(ServiceRequest(req))
-        } else {
+            }
-            Err((req, pl))
+            None => Err((req, pl)),
         }
     }
 
@@ -87,7 +88,9 @@ impl ServiceRequest {
     /// can be re-constructed only if rc's strong pointers count eq 1 and
     /// weak pointers count is 0.
     pub fn from_request(req: HttpRequest) -> Result<Self, HttpRequest> {
-        if Rc::strong_count(&req.0) == 1 && Rc::weak_count(&req.0) == 0 {
+        // There is no weak pointer used on HttpRequest so intentionally
+        // ignore the check.
+        if Rc::strong_count(&req.0) == 1 {
             Ok(ServiceRequest(req))
         } else {
             Err(req)