Add web::ReqData

src/lib.rs

@@ -82,6 +82,7 @@ mod handler;
 mod info;
 pub mod middleware;
 mod request;
+mod request_data;
 mod resource;
 mod responder;
 mod rmap;

src/request_data.rs

@@ -0,0 +1,51 @@
+use std::ops::{Deref, DerefMut};
+
+use actix_http::error::{Error, ErrorInternalServerError};
+use futures_util::future;
+
+use crate::{dev::Payload, FromRequest, HttpRequest};
+
+/// Request data.
+///
+/// Request data is a piece of arbitrary data attached to a request.
+///
+/// It can be set via [`HttpMessage::extensions_mut`].
+///
+/// [`HttpMessage::extensions_mut`]: crate::HttpMessage::extensions_mut
+#[derive(Clone, Debug)]
+pub struct ReqData<T: Clone + 'static>(pub T);
+
+impl<T: Clone + 'static> Deref for ReqData<T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        &self.0
+    }
+}
+
+impl<T: Clone + 'static> DerefMut for ReqData<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl<T: Clone + 'static> FromRequest for ReqData<T> {
+    type Config = ();
+    type Error = Error;
+    type Future = future::Ready<Result<Self, Error>>;
+
+    fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
+        if let Some(st) = req.extensions().get::<T>() {
+            future::ok(ReqData(st.clone()))
+        } else {
+            log::debug!(
+                "Failed to construct App-level ReqData extractor. \
+                 Request path: {:?}",
+                req.path()
+            );
+            future::err(ErrorInternalServerError(
+                "Missing expected request extension data",
+            ))
+        }
+    }
+}

src/web.rs

@@ -19,6 +19,7 @@ use crate::service::WebService;
 pub use crate::config::ServiceConfig;
 pub use crate::data::Data;
 pub use crate::request::HttpRequest;
+pub use crate::request_data::ReqData;
 pub use crate::types::*;
 
 /// Create resource for a specific path.