chore: clean up up warning behavior for resources that depend on other resources (#4415) (closes #3372)

leptos_server/src/resource.rs

@@ -188,6 +188,39 @@ where
     }
 }
 
+#[cfg(debug_assertions)]
+thread_local! {
+    static RESOURCE_SOURCE_SIGNAL_ACTIVE: AtomicBool = const { AtomicBool::new(false) };
+}
+
+#[cfg(debug_assertions)]
+/// Returns whether the current thread is currently running a resource source signal.
+pub fn in_resource_source_signal() -> bool {
+    RESOURCE_SOURCE_SIGNAL_ACTIVE
+        .with(|scope| scope.load(std::sync::atomic::Ordering::Relaxed))
+}
+
+/// Set a static to true whilst running the given function.
+/// [`is_in_effect_scope`] will return true whilst the function is running.
+fn run_in_resource_source_signal<T>(fun: impl FnOnce() -> T) -> T {
+    #[cfg(debug_assertions)]
+    {
+        // For the theoretical nested case, set back to initial value rather than false:
+        let initial = RESOURCE_SOURCE_SIGNAL_ACTIVE.with(|scope| {
+            scope.swap(true, std::sync::atomic::Ordering::Relaxed)
+        });
+        let result = fun();
+        RESOURCE_SOURCE_SIGNAL_ACTIVE.with(|scope| {
+            scope.store(initial, std::sync::atomic::Ordering::Relaxed)
+        });
+        result
+    }
+    #[cfg(not(debug_assertions))]
+    {
+        fun()
+    }
+}
+
 impl<T, Ser> ReadUntracked for ArcResource<T, Ser>
 where
     T: 'static,
@@ -202,7 +235,9 @@ where
                 computed::suspense::SuspenseContext, effect::in_effect_scope,
                 owner::use_context,
             };
-            if !in_effect_scope() && use_context::<SuspenseContext>().is_none()
+            if !in_effect_scope()
+                && !in_resource_source_signal()
+                && use_context::<SuspenseContext>().is_none()
             {
                 let location = std::panic::Location::caller();
                 reactive_graph::log_warning(format_args!(
@@ -271,7 +306,7 @@ where
         let refetch = ArcRwSignal::new(0);
         let source = ArcMemo::new({
             let refetch = refetch.clone();
-            move |_| (refetch.get(), source())
+            move |_| (refetch.get(), run_in_resource_source_signal(&source))
         });
         let fun = {
             let source = source.clone();
@@ -909,7 +944,9 @@ where
                 computed::suspense::SuspenseContext, effect::in_effect_scope,
                 owner::use_context,
             };
-            if !in_effect_scope() && use_context::<SuspenseContext>().is_none()
+            if !in_effect_scope()
+                && !in_resource_source_signal()
+                && use_context::<SuspenseContext>().is_none()
             {
                 let location = std::panic::Location::caller();
                 reactive_graph::log_warning(format_args!(