Allow to skip runtime feature for clippy run (#440)

ntex-rt/CHANGES.md

@@ -1,5 +1,9 @@
 # Changes
 
+## [0.4.20] - 2024-10-17
+
+* Allow to skip runtime feature for clippy run
+
 ## [0.4.19] - 2024-10-11
 
 * Force runtime feature selection

ntex-rt/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ntex-rt"
-version = "0.4.19"
+version = "0.4.20"
 authors = ["ntex contributors <team@ntex.rs>"]
 description = "ntex runtime"
 keywords = ["network", "framework", "async", "futures"]

ntex-rt/build.rs

@@ -1,24 +1,33 @@
 use std::{collections::HashSet, env};
 
 fn main() {
+    let mut clippy = false;
     let mut features = HashSet::<&'static str>::default();
 
-    for (key, _val) in env::vars() {
+    for (key, val) in env::vars() {
         let _ = match key.as_ref() {
             "CARGO_FEATURE_COMPIO" => features.insert("compio"),
             "CARGO_FEATURE_TOKIO" => features.insert("tokio"),
             "CARGO_FEATURE_GLOMMIO" => features.insert("glommio"),
             "CARGO_FEATURE_ASYNC_STD" => features.insert("async-std"),
+            "CARGO_CFG_FEATURE" => {
+                if val.contains("cargo-clippy") {
+                    clippy = true;
+                }
+                false
+            }
             _ => false,
         };
     }
 
-    if features.is_empty() {
-        panic!("Runtime must be selected '--feature=ntex/$runtime', available options are \"compio\", \"tokio\", \"async-std\", \"glommio\"");
-    } else if features.len() > 1 {
-        panic!(
-            "Only one runtime feature could be selected, current selection {:?}",
-            features
-        );
+    if !clippy {
+        if features.is_empty() {
+            panic!("Runtime must be selected '--feature=ntex/$runtime', available options are \"compio\", \"tokio\", \"async-std\", \"glommio\"");
+        } else if features.len() > 1 {
+            panic!(
+                "Only one runtime feature could be selected, current selection {:?}",
+                features
+            );
+        }
     }
 }

ntex-rt/src/lib.rs

@@ -472,3 +472,76 @@ pub use self::glommio::*;
 
 #[cfg(feature = "compio")]
 pub use self::compio::*;
+
+#[allow(dead_code)]
+#[cfg(all(
+    not(feature = "tokio"),
+    not(feature = "async-std"),
+    not(feature = "compio"),
+    not(feature = "glommio")
+))]
+mod no_rt {
+    use std::task::{Context, Poll};
+    use std::{fmt, future::Future, marker::PhantomData, pin::Pin};
+
+    /// Runs the provided future, blocking the current thread until the future
+    /// completes.
+    pub fn block_on<F: Future<Output = ()>>(_: F) {
+        panic!("async runtime is not configured");
+    }
+
+    pub fn spawn<F>(_: F) -> JoinHandle<F::Output>
+    where
+        F: Future + 'static,
+    {
+        unimplemented!()
+    }
+
+    pub fn spawn_blocking<F, T>(_: F) -> JoinHandle<T>
+    where
+        F: FnOnce() -> T + Send + Sync + 'static,
+        T: Send + 'static,
+    {
+        unimplemented!()
+    }
+
+    /// Blocking operation completion future. It resolves with results
+    /// of blocking function execution.
+    #[allow(clippy::type_complexity)]
+    pub struct JoinHandle<T> {
+        t: PhantomData<T>,
+    }
+
+    impl<T> JoinHandle<T> {
+        pub fn is_finished(&self) -> bool {
+            true
+        }
+    }
+
+    impl<T> Future for JoinHandle<T> {
+        type Output = Result<T, JoinError>;
+
+        fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
+            todo!()
+        }
+    }
+
+    #[derive(Debug, Copy, Clone)]
+    pub struct JoinError;
+
+    impl fmt::Display for JoinError {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "JoinError")
+        }
+    }
+
+    impl std::error::Error for JoinError {}
+}
+
+#[cfg(all(
+    not(feature = "tokio"),
+    not(feature = "async-std"),
+    not(feature = "compio"),
+    not(feature = "glommio")
+))]
+pub use self::no_rt::*;