Implemented OutputType for tokio Mutex

Cargo.toml

@@ -24,7 +24,7 @@ decimal = ["rust_decimal"]
 cbor = ["serde_cbor"]
 chrono-duration = ["chrono", "iso8601-duration"]
 password-strength-validator = ["zxcvbn"]
-tokio-rw-lock = ["tokio"]
+tokio-sync = ["tokio"]
 
 [dependencies]
 async-graphql-derive = { path = "derive", version = "3.0.38" }

src/types/external/tokio/sync/mod.rs

@@ -1,2 +1,4 @@
-#[cfg(feature = "tokio-rw-lock")]
+#[cfg(feature = "tokio-sync")]
 mod rw_lock;
+#[cfg(feature = "tokio-sync")]
+mod mutex;

src/types/external/tokio/sync/mutex.rs

@@ -0,0 +1,26 @@
+use tokio::sync::Mutex;
+use std::borrow::Cow;
+
+use async_graphql_parser::types::Field;
+
+use crate::{registry, ContextSelectionSet, OutputType, Positioned, ServerResult, Value};
+
+#[async_trait::async_trait]
+impl<T: OutputType> OutputType for Mutex<T>
+{
+    fn type_name() -> Cow<'static, str> {
+        T::type_name()
+    }
+
+    fn create_type_info(registry: &mut registry::Registry) -> String {
+        <T as OutputType>::create_type_info(registry)
+    }
+
+    async fn resolve(
+        &self,
+        ctx: &ContextSelectionSet<'_>,
+        field: &Positioned<Field>,
+    ) -> ServerResult<Value> {
+        self.lock().await.resolve(ctx, field).await
+    }
+}